EP3815925A1 - Drawing compass - Google Patents
Drawing compass Download PDFInfo
- Publication number
- EP3815925A1 EP3815925A1 EP20204412.9A EP20204412A EP3815925A1 EP 3815925 A1 EP3815925 A1 EP 3815925A1 EP 20204412 A EP20204412 A EP 20204412A EP 3815925 A1 EP3815925 A1 EP 3815925A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- operating member
- moving device
- outer casing
- drawing compass
- legs
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
- B43L9/00—Circular curve-drawing or like instruments
- B43L9/02—Compasses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
- B43L9/00—Circular curve-drawing or like instruments
- B43L9/16—Features common to compasses, dividers, and callipers
Definitions
- the present invention relates to a drawing compass, and more particularly to a drawing compass that can be rotated stably in operation.
- a conventional drawing compass is one of the writing stationeries for users to draw circular or arc-shaped lines.
- a user when operating the conventional drawing compass, a user must use two fingers to hold a knob of the conventional drawing compass and make it roll between the fingers, making it difficult to strike a balance.
- the conventional drawing compass may easily slip off the user's fingers accidentally, causing inconvenience in use. Therefore, there were some improved structures, such as CN Pub. No. 102152694B filed in China and titled "Compasses".
- the compasses have a body and an operating element.
- the body has two legs and a center drive connected to the two legs.
- the operating element is pivotably connected to a supporting element that is disposed on a top end of the center drive.
- the body with the supporting element can be tilted to make its central axis intersect a rotation axis of the operating element. It is convenient for the user to hold the operating element and execute strength for drawing a circle or an arc without making the supporting element roll between the user's fingers, but such tilt-swing operation is only suitable for drawing a large circle or arc rather than a small circle or arc.
- it is neither easy nor convenient to hold the operating element to operate the tiltably rotatable drawing compass because the user must remove the operating element from the supporting element and then hold and make the supporting element roll between the user's fingers for drawing a circle or an arc. In this way, the user must constantly combine or remove the operating element with or from the supporting element according to the sizes of required arcs or circles without an automatic adjustment mechanism, leading to operational inconvenience.
- a drawing compass has been disclosed in JP Patent No. 5620842 with an operating structure that can be held pivotally for operation.
- the operating structure may be shaken arbitrarily, making the user unable to rotate the drawing compass steadily, so that it is thus extremely difficult to operate the drawing compass and further improvement is necessary.
- the main objective of the present invention is to provide a drawing compass that can be operated stably, easily, and conveniently.
- the drawing compass in accordance with the present invention has an outer casing, a moving device, two legs, and an operating member.
- the outer casing has a limiting hole running through a top of the outer casing.
- the moving device is moveable up or down relative to the outer casing and has a connecting portion and two linking portions.
- An imaginary longitudinal first axis passes through the moving device.
- the connecting portion is located at a top of the moving device.
- the two linking portions are located at two opposite sides beside the imaginary longitudinal first axis, respectively.
- the two legs can be pivotally moved toward or away from each other to define an included angle therebetween, are connected to the outer casing, and are rotatably connected to the two linking portions, respectively.
- the operating member is lengthwise and has a connecting end, an operating end, and a limiting portion.
- the connecting end and the operating end are located away from each other lengthways, the limiting portion is disposed between the connecting end and the operating end, the operating end is disposed outside the outer casing, and the connecting end is rotatably connected to the connecting portion of the moving device to enable the operating member to freely swing the connecting end serving as a fulcrum.
- the moving device is moved to drive the operating member to move up or down lengthways relative to the outer casing.
- the drawing compass in accordance with the present invention has the following advantages.
- parts of the operating member are selectively limited by the up-and-down movement of the operating member relative to the outer casing, so that the swing range of the operating member can be freely adjusted to draw a circle or an arc, thereby enabling users to operate the drawing compass to draw large or small circles/arcs quickly and highly maneuverably, further greatly enhancing the diversity and practicality of operations of the drawing compass.
- an exposed part of the operating member emerging from the limiting hole of the outer casing becomes longer as the radius of a circle or an arc to be drawn becomes larger, thereby shortening an unexposed part of the limiting portion submerging in the limiting hole, so that the swing range of the operating member is automatically adjusted to become larger accordingly. Therefore, the drawing compass of the present invention can be set according to the radius of a circle or an arc to be drawn to automatically adjust the swing range of the operating member, effectively solving the problem that the tilt-swing operating range of the conventional drawing compass cannot be adjusted.
- the drawing compass of the present invention can be used to freely select a required swing range of the operating member for drawing a circle or an arc, thus enabling users to quickly and highly maneuverably draw circles/arcs with a required radius, thus greatly enhancing the versatility and practicability of the drawing compass in operation.
- a drawing compass constructed in accordance with a first preferred embodiment of the present invention includes a moving device 10, two legs 20, an operating member 30, and an outer casing 40.
- the moving device 10 is disposed in the outer casing 40 and moveable upwardly or downwardly relative to the outer casing 40.
- the moving device 10 has a connecting portion 11 and two linking portions 12.
- An imaginary longitudinal first axis C 1 passes through a center of the moving device 10.
- the connecting portion 11 is located at a top of the moving device 10, deviating from the imaginary longitudinal first axis C 1 of the moving device 10, and may be a concave portion or a convex portion.
- the two linking portions 12 are symmetrically located at two opposite sides beside the imaginary longitudinal first axis C 1 of the moving device 10, respectively, and can pivotally move toward or away from the imaginary longitudinal first axis C 1 of the moving device 10 at the same time.
- the moving device 10 has two half bodies 13 connected to each other, the connecting portion 11 is disposed between the two half bodies 13, and the two half bodies 13 are connected to each other by multiple grooves 131 and protrusions 132. Also, each of the two linking portions 12 of the moving device 10 has a swingable linking rod 14, each of which has a swing end located away from the operating member 30 and is located between the two half bodies 13.
- the moving device 10 has a guiding structure facing outwardly, and the outer casing 40 has a positioning structure facing inwardly and corresponding to the guiding structure of the moving device 10.
- the guiding structure can move along the positioning structure to improve the stability of linear movement of the moving device 10.
- the linear movement of the moving device 10 is parallel to the imaginary longitudinal first axis C 1 of the moving device 10.
- the moving device 10 has two opposite outer sides, the guiding structure is formed of two guiding portions 15 located on the two opposite outer sides of the moving device 10, respectively, and each of the guiding portions 15 is an elongated rib located on an outer side of one of the two half bodies 13.
- the two legs 20 can be pivotally moved toward or away from each other with respect to the outer casing 40 and are swingably connected to the two linking portions 12 of the moving device 10, respectively.
- Each of the two legs 20 has a pivotal portion 21 and a coaxial portion 22, both of which are disposed on a top thereof.
- Each of the pivotal portions 21 is located outside the corresponding leg 20 with respect to the corresponding coaxial portion 22 and is pivotally connected to one of the two linking portions 12 of the moving device 10.
- each of the pivotal portions 21 of the two legs 20 is pivotally connected to one of the swing ends of the two linking rods 14 of the moving device 10.
- the coaxial portions 22 of the two legs 20 overlap and are coaxially pivotally connected to each other to enable bottom ends of the two legs 20 to move toward or away from each other.
- the two legs 20 can be pivotally moved toward or away from each other synchronously with respect to the imaginary longitudinal first axis C 1 more accurately.
- an included angle defined between the two legs 20 relative to the imaginary longitudinal first axis C 1 can keep symmetrically consistent, so that the drawing compass of the present invention can be operated stably on its center of gravity.
- the operating member 30 is lengthwise and has a connecting end 31 and an operating end 32.
- the connecting end 31 and the operating end 32 are located away from each other lengthways.
- the operating member 30 further has a limiting portion 33 disposed between the connecting end 31 and the operating end 32.
- the operating end 32 of the operating member 30 is disposed outside the outer casing 40.
- the connecting end 31 of the operating member 30 is rotatably connected to the connecting portion 11 of the moving device 10, so that the operating member 30 can freely swing on the connecting end 31 serving as a fulcrum.
- the connecting portion 11 is a concave portion
- the connecting end 31 of the operating member 30 is a spherical body matching the connecting portion 11 in shape.
- the limiting portion 33 can be a tapered structure that has an outer diameter gradually increasing from the connecting end 31 to the operating end 32. Since an upper part of the limiting portion 33, adjacent to the operating end 32, is thicker than the other lower part of the limiting portion 33, higher rigidity can be provided to avoid any adverse effect on the structural strength of the operating member 30 after the drawing compass has been operated for multiple times. Also, the outer diameter of the lower part of the limiting portion 33, near the connecting end 31, is relatively smaller, so the volume of the connecting portion 11 of the moving device 10 can be reduced accordingly, thereby reducing the overall volume of the moving device 10.
- the operating end 32 can be a block or a plate having a relatively larger volume for easy holding.
- the imaginary longitudinal first axis C 1 passing through the moving device 10 is parallel to the lengthwise operating member 30, an imaginary longitudinal second axis C 2 passes through the connecting end 31 and the limiting portion 33 of the operating member 30 to be parallel to the lengthwise operating member 30, and an eccentric distance E is formed between the two imaginary longitudinal axes C 1 , C 2 .
- one of the pivotal portions 21 of the two legs 20 is located closer to the imaginary longitudinal second axis C 2 than the imaginary longitudinal first axis C 1 and the corresponding leg 20 is defined as an eccentric side leg, and a linear distance S is defined between the pivotal portion 21 and the coaxial portion 22 of the eccentric side leg 20.
- the eccentric distance E is less than or equal to the linear distance S.
- an imaginary first extending line P 1 passes through the centers of the coaxial portions 22 of the two legs 20, being orthogonal to the imaginary longitudinal first axis C 1 .
- An imaginary second extending line P 2 passes through the center of the pivotal portion 21 of the eccentric side leg 20.
- the imaginary first extending line P 1 is parallel to the imaginary second extending line P 2
- the linear distance S is a vertical distance between the imaginary first extending line P 1 and the imaginary second extending line P 2 .
- the connecting end 31 of the operating member 30 is located right above the pivotal portion 21 of the eccentric side leg 20, making it the easiest to execute strength for drawing a circle or an arc. If the eccentric distance E is larger than the linear distance S, it will be not easy to execute strength for drawing a small circle or arc.
- the two legs 20 are a pin leg and a pen leg, respectively, the connecting end 31 of the operating member 30 is connected to the connecting portion 12 corresponding to the pen leg; that is, the eccentric side leg 20 is a pen leg.
- the outer casing 40 is connected to the two legs 20 and has two inner sides facing each other, a fixing member 41, and a limiting hole 42.
- the fixing member 41 is inserted through the coaxial portions 22 of the two legs 20 to coaxially connect the two legs 20 with the outer casing 40.
- the limiting hole 42 runs through a top of the outer casing 40 to enable the operating end 32 of the operating member 30 to be located outside the limiting hole 42 of the outer casing 40.
- the moving device 10 is moved along the imaginary longitudinal first axis C 1 , while the two legs 20 are pivotally moved toward or away from each other, to drive the operating member 30 to move upwardly or downwardly lengthways relative to the outer casing 40, so that parts of the limiting portion 33 of the operating member 30 can selectively contact an inner sidewall of the limiting hole 42 of the outer casing 40 in operation.
- the connecting portion 11 of the moving device 10 deviates from the imaginary longitudinal first axis C 1 , the imaginary longitudinal second axis C 2 passes through the connecting portion 11, and is straightly opposite to the limiting hole 42 of the outer casing 40, and the connecting portion 11 is connected to the connecting end 31 of the operating member 30.
- the positioning structure is disposed on the two inner sides of the outer casing 40 and has two positioning portions 43 corresponding to the two guiding portions 15, respectively.
- Each of the two positioning portions 43 is connected to one of the two guiding portions 15 of the moving device 10, so that each of the two guiding portions 15 is moved along the corresponding positioning portion 43 when the moving device 10 is moved with the pivotal movement of the two legs 20, thus providing a guiding effect of up-and-down linear movement for the moving device 10.
- the outer casing 40 may have two half-shells 44 connected to each other, and the two half-shells 44 are coaxially connected to the coaxial portions 22 of the two legs 20 by the fixing member 41.
- the limiting portion 33 of the operating member 30 fully submerges in the limiting hole 42 of the outer casing 40.
- the moving device 10 is linked up with the two legs 20 to move along the lengthwise operating member 30 relative to the outer casing 40 to further move the operating member 30 upwardly.
- the limiting portion 33 of the operating member 30 gradually emerges upwardly from the limiting hole 42 of the outer casing 40, and a swing range of the operating member 30 is positively correlated with the included angle of the two legs 20.
- the drawing compass of the present invention can be set according to the radius of a circle or an arc to be drawn to automatically adjust the swing range of the operating member 30, effectively solving the problem that the tilt-swing operating range of the conventional drawing compass cannot be adjusted.
- the drawing compass of the present invention can be used to freely select a required swing range of the operating member for drawing a circle or an arc, thus enabling users to quickly and highly maneuverably draw a circle or an arc with a required radius, thus greatly enhancing the versatility and practicability of the drawing compass in operation.
- the two linking rods 14 are linked up with the two legs 20 to move the moving device 10 upwardly along the outer casing 40, and each of the two guiding portions 15 of the moving device 10 can move upwardly along the corresponding positioning portions 43 as shown in Figs. 2 and 3 , thereby driving the operating member 30 to move upwardly relative to the outer casing 40.
- the exposed part of the limiting portion 33 of the operating member 30 emerging from the limiting hole 42 of the outer casing 40 becomes longer, and the swing range of the operating member 30 becomes larger and the operating member 30 can be operated to tilt and swing freely with respect to the imaginary longitudinal first axis C 1 , so that the user can hold the operating member 30 of the drawing compass of the present invention to draw a circle or an arc with a larger radius.
- the user can also choose to hold the two half-shells 44 instead of the outer casing 40. Therefore, the drawing compass of the first preferred embodiment of the present invention can be used to draw large or small circles/arcs having various radiuses quickly and highly maneuverably, thus providing users with diversified operation methods and effectively enhancing the practicability of the drawing compass.
- the eccentric distance E is formed between the imaginary longitudinal second axis C 2 and the imaginary longitudinal first axis C 1 , so that a force arm of the drawing compass of the present invention is increased and the torque of rotation in the process of drawing a circle or an arc is also increased, thus further enabling the user to draw circles or arcs more smoothly, especially for large or small circles/arcs that can be drawn quickly and highly maneuverably.
- a drawing compass constructed in accordance with a second preferred embodiment of the present invention is substantially the same as that of the first preferred embodiment except for the following features.
- the moving device 10A does not have the two linking rods 14 and is an elastic C-like structure.
- the moving device 10A can be shaped like another geometric figure (e.g. triangle, quadrilateral, or polygon) having an opening.
- Each of the two linking portions 12A of the moving device 10A, located away from the operating member 30A, is a swing end, and top ends of the two legs 20A are rotatably connected to the swing ends of the two linking portions 12A, respectively.
- the moving device 10A is a flexible C-like clamp structure, each of the swing ends of the moving device 10A has a clamping portion 16A, and the top ends of the two legs 20A are pivotally connected to the clamping portions 16A of the two linking portions 12A of the moving device 10A, respectively.
- the included angle of the two legs 20 is set large, the operating member 30A is linked up with the two legs 20 to move the moving device 10A upwardly relative to the outer casing 40, the exposed part of the limiting portion 33A of the operating member 30A emerging from the limiting hole 42A of the outer casing 40A becomes longer to make the unexposed part of the same shorter, so that the operating member 30A can be operated to tilt and swing freely with respect to the imaginary longitudinal first axis C 1 .
- the user can hold the operating member 30A of the drawing compass of the second preferred embodiment of the present invention to draw a circle or an arc with a larger radius, thus providing users with diversified operation methods and effectively enhancing the practicability of the drawing compass.
- a drawing compass constructed in accordance with a third preferred embodiment of the present invention is substantially the same as that of the first preferred embodiment except for the following features.
- the outer casing 40B has a holding portion 45B formed on the top of the outer casing 40B and protruding along the lengthwise operating member 30B.
- the holding portion 45B can be used to limit the free swing of the operating member 30B relative to the outer casing 40B, and the holding portion 45B can be integrally formed with one of the two half-shells 44B.
- the limiting hole 42B is formed inside the holding portion 45B, and the operating end 32B of the operating member 30B is located outside the holding portion 45B to enable parts of the limiting portion 33B of the operating member 30B to selectively contact the inner sidewall of the limiting hole 42B.
- the drawing compass further has a cap 50B, and the cap 50B is selectively connected to a bottom of one or the other of the two legs 20B or the operating end 32B of the operating member 30B.
- the limiting portion 33B of the operating member 30B is fully moved into the limiting hole 42B of the outer casing 40B.
- the two legs 20B will force the moving device 10B to move along the lengthwise operating member 30B relative to the outer casing 40B to drive the operating member 30B to move upwardly.
- the limiting portion 33B of the operating member 30B gradually emerges upward from the limiting hole 42B of the outer casing 40B, and the swing range of the operating member 30B is positively correlated to the included angle of the two legs 20B.
- the exposed part of the operating member 30B emerging from the limiting hole 42B of the outer casing 40B becomes longer as the radius of a circle or an arc to be drawn becomes larger, so that the swing range of the operating member 30B is automatically adjusted and increased accordingly. Therefore, the drawing compass of the present invention can be set according to the radius of the circle/arc to automatically adjust the swing range of the operating member 30B.
- the exposed part of the limiting portion 33B of the operating member 30B emerging from the holding portion 45B of the outer casing 40B becomes longer, and the swing range of the operating member 30B becomes larger and the operating member 30B can be operated to tilt and swing freely with respect to the imaginary longitudinal first axis C 1 , so that the user can hold the operating member 30B of the drawing compass of the present invention to draw a circle or an arc with a larger radius.
- the bottom of one of the two legs 20B has a first engaging structure 24B
- the operating member 30B has a second engaging structure 34B formed on an external surface of the exposed part of the operating element 30 B and located close to an opening of the holding portion 45B
- the cap 50B has a third engaging structure 51B.
- the third engaging structure 51B selectively engages with the first engaging structure 24B or the second engaging structure 34B to connect the cap 50B with the two legs 20B or the operating member 30B.
- the user can also hold the cap 50B to draw a circle or an arc via the engagement between the third engaging structure 51B and the second engaging structure 34B and further integral coordination between the cap 50B and the operating member 30B. Consequently, the cap 50B not only increases the holding stability during circle/arc drawing, but also provides a protective effect for the drawing compass by covering the bottoms of the two legs 20B when the drawing compass is not in use.
- a drawing compass constructed in accordance with a fourth preferred embodiment of the present invention is substantially the same as the third preferred embodiment except for the following features.
- the fourth preferred embodiment of the drawing compass there is no eccentric distance between the moving device 10C and the connecting end 31C of the operating member 30C.
- the imaginary longitudinal first axis C 1 and the imaginary longitudinal second axis C 2 fully overlap each other.
- each of the two half-shells 44C has an arc-shaped limiting section 443C formed on a lower segment of the half-shell 44C.
- the limiting portion 33C of the operating member 30C has a first length L 1
- the holding portion 45C has a second length L 2
- the moving device 10C has a maximum displacement D.
- the first length L 1 is not less than the sum of the second length L 2 and the maximum displacement D, that is, L 1 ⁇ L 2 +D.
- a gap is formed between the limiting portion 33C of the operating member 30C and an inner sidewall of the holding portion 45C.
- the gap is not less than 0.05 millimeters.
- the limiting portion 33C of the operating member 30C fully submerges in the limiting hole 42C of the outer casing 40C.
- the moving device 10C is linked up with the two legs 20C to move the operating member 30C upwardly lengthways relative to the outer casing 40C.
- the limiting portion 33C of the operating member 30C gradually emerges upwardly from the limiting hole 42C of the outer casing 40C.
- the swing range of the operating member 30C is positively correlated with the opening angle of the two legs 20C; that is, the exposed part of the operating member 30C emerging from the limiting hole 42C of the outer casing 40C becomes longer as the radius of a circle or an arc to be drawn becomes larger, so that the swing range of the operating member 30C is automatically adjusted and increased accordingly. Therefore, the drawing compass of the present invention can be set according to the radius of the circle/arc to automatically adjust the swing range of the operating member 30C, effectively solving the problem that the tilt-swing operating range of the conventional drawing compass cannot be adjusted. In this way, the drawing compass of the present invention can enable users to quickly and highly maneuverably draw a circle or an arc with a required radius, thus greatly enhancing the versatility and practicability of operation of the drawing compass.
- the swing range of the operating member 30C becomes larger.
- the operating member 30C when the operating member 30C is lifted by 2 millimeters, the operating member 30C can be tilted for an angle of 1.36 degrees relative to an imaginary central axis of the limiting hole 42C, and when the operating member 30C is lifted by 9 millimeters, the operating member 30C can be tilted for an angle of 2.05 degrees relative to the central axis of the limiting hole 42C.
- the two linking rods 14C are linked up with the two legs 20C to move the moving device 10C upwardly relative to the outer casing 40C, and each of the two guiding portions 15C of the moving device 10C moves upwardly along the corresponding positioning portion 43C as shown in Fig. 19 , thereby driving the operating member 30C to move upwardly relative to the outer casing 40C.
- the exposed part of the limiting portion 33C of the operating member 30C emerging from the limiting hole 42C of the outer casing 40C becomes longer, so that the swing range of the operating member 30C becomes larger and the operating member 30C can be operated to tilt and swing freely with respect to the outer casing 40C and the user can hold the operating member 30C of the drawing compass of the present invention to draw a circle or an arc with a larger radius.
- the drawing compass of the fourth preferred embodiment of the present invention can draw large or small circles/arcs of various radiuses quickly and highly maneuverably, providing users with diversified operation methods and effectively enhancing the practicability of the drawing compass.
- the limiting space defined between the limiting sections 443C of the two half-shells 44C of the outer casing 40C can be used to limit the included angle of the two legs 20C relative to the outer casing 40C, thus effectively keeping the included angle of the two legs 20C within an appropriate range.
- the two legs 20C are symmetrically connected to the moving device 10C by the two linking rods 14C, so that the drawing compass of the present invention can be rotated on its center of gravity without deviating from the rotation and slipping off the user's fingers, and the user can rotate the drawing compass steadily.
- the limiting portion 33C of the operating member 30C has an engagement structure 33C' disposed on an external surface of the limiting portion 33C adjacent to the operating end 32C, and an outer diameter of the engagement structure 33C' is larger than either of those of other parts of the limiting portion 33C.
- the engagement structure 33C' can be shaped like a triangle, a polygon, a tooth, or a groove, and the top end of the limiting hole 42C' of the outer casing 40C has an inner peripheral surface that matches the engagement structure 33C' of the operating member 30C in shape, so that parts of the limiting portion 33C of the operating member 30C can selectively engage with the limiting hole 42C' of the outer casing 40C.
- the engagement structure 33C' of the limiting portion 33C engages with the limiting hole 42C' to enable the user to draw a smaller circle or an arc, thus disabling the operating member 30C from free swing.
- the operating member 30C can be automatically enabled for free swing while the operating member 30C is lifted upwardly to enable the engagement structure 33C' of the limiting portion 33C to escape from the limiting hole 42C'.
- the outer diameter of the limiting portion 33C keeps uniform from a lower end of the engagement structure 33C' toward the connecting end 31C.
- each of the linking rods 14C' of the moving device 10C that is pivotally connected to the corresponding leg 20C is an elastically deformable engaging structure.
- each of the linking rods 14C' has a first pivotal end 141C' and an elastic second pivotal end 142C', both of which are located away from each other, each of the first pivotal ends 141C' has a through hole running therethrough, each of the second pivotal ends 142C' has a slot 143C', and each second pivotal end 142C' has two columns protruding from two opposite outer surfaces of the second pivotal end 142C', respectively.
- the first pivotal ends 141C' of the two linking rods 14C' are rotatably clamped between the two half bodies 13C of the moving device 10C.
- the protrusions 132C' of the two half bodies 13C are inserted through the through holes of the two first pivotal ends 141C' and then into the grooves 131C' and, further coaxially interconnecting the protrusions 132C' and the grooves 131C'.
- the two second pivotal ends 142C' of the two linking rods 14C' are elastically deformably engaged with the pivotal portions 21C on the tops of the two legs 20C, respectively.
- each second pivotal end 142C' are mounted in two pivot holes of the pivotal portion 21C of the corresponding leg 20, respectively, to pivotally connect the linking rod 14C with the corresponding leg 20C without any pivot pin, thus reducing the overall number of components and further decreasing the manufacturing cost.
- a drawing compass constructed in accordance with a fifth preferred embodiment of the present invention is substantially the same as that of the fourth preferred embodiment except for the following features.
- the outer casing 40D does not have the holding portion 45C as the outer casing 40C of the fourth preferred embodiment of the drawing compass
- the limiting portion 33D of the operating member 30 has two parts, one of which defines an engagement structure located adjacent to the operating end 32D and having an outer diameter larger than that of the other part of the limiting portion 33D.
- the engagement structure has a polygonal external surface.
- the engagement structure is a hexagonal column and has a regular hexagonal cross-section perpendicular to the lengthwise operating member 30D.
- the other part of the limiting portion 33D can be hexagonal tapered.
- the limiting hole 42D runs through the top of the outer casing 40D and has an inner peripheral surface that matches the engagement structure of the operating member 30D in shape. In this way, the limiting portion 33D of the operating member 30D can selectively engage with the limiting hole 42D of the outer casing 40D as the operating member 30D moves up or down.
- the included angle of the two legs 20D of the drawing compass of the fifth preferred embodiment of the present invention is set zero or smaller as shown in Figs. 29 and 30 , the limiting portion 33D of the operating member 30D engages with the limiting hole 42D of the outer casing 40D, so that the operating member 30D submerges in the limiting hole 42D of the outer casing 40D without free swing relative to the outer casing 40D and a user can draw a circle or an arc with a smaller radius.
- the user can also set the included angle of the two legs 20D larger, so that the two linking rods 14D are linked up with the two legs 20D to move the two half bodies 13D upward with respect to the outer casing 40D.
- each of the two guiding portions 15D of the moving device 10D can move upwardly along the corresponding positioning portion 43D, thereby driving the operating member 30D to stably move upwardly relative to the outer casing 40D, so that the engagement structure of the limiting portion 33D of the operating member 30D disengages from the limiting hole 42D of the outer casing 40D.
- the operating member 30D can be operated to tilt and swing freely relative to the outer casing 40D, and the user can hold the operating member 30D and to draw a circle or an arc with a larger radius, thereby providing users with diversified operation methods and effectively enhancing the practicability of the drawing compass.
- a drawing compass constructed in accordance a sixth preferred embodiment of the present invention is substantially the same as that of the fourth preferred embodiment except for the following features.
- the moving device 10E does not have the two linking rods 14C of the moving device 10C of the fourth preferred embodiment, and the moving device 10E is an elastic C-like clamping structure.
- the moving device 10E can be another geometric figure (e.g. triangle, quadrilateral or polygon) having an opening, each of the two linking portions 12E of the moving device 10E has a clamping portion 16E, and each of the clamping portions 16E has two clamping cylindrical protrusions spaced from each other.
- the top ends of the two legs 20E are pivotally connected to each other and are connected to the clamping portions 16E of the two linking portions 12E of the moving device 10E, respectively, and each of the two legs 20E has a mounting post 23E mounted between the two cylindrical protrusions of one of the two clamping portions 16E to engage with the clamping portion 16E of the corresponding linking portion 12E of the moving device 10E.
- the limiting portion 33E of the operating member 30E has a polygonal engagement structure, and the limiting hole 42E runs through the top of the holding portion 45E and has an inner peripheral surface that matches the engagement structure of the operating member 30E in shape. In this way, the limiting portion 33E of the operating member 30E can be selectively engaged with the limiting hole 42E of the outer casing 40E.
- the included angle of the two legs 20E of the drawing compass of the sixth preferred embodiment of the present invention is set zero or smaller as shown in Fig. 35
- the limiting portion 33E of the operating member 30E engages with the limiting hole 42E of the outer casing 40E, and the operating member 30E submerges in the limiting hole 42E of the outer casing 40E without free swing relative to the outer casing 40E, so that a user can hold the operating member 30E to draw a circle or an arc with a smaller radius.
- the operating member 30E when the user sets the included angle of the two legs 20E larger, the operating member 30E is linked up with the two legs 20E and to move the moving device 10E upwardly relative to the outer casing 40E, so that the engagement structure of the limiting portion 33E of the operating member 30E is disengaged from the limiting hole 42E of the outer casing 40E.
- the operating member 30E can be operated to tilt and swing freely relative to the outer casing 40E, and the user can hold the operating member 30E to draw a circle or an arc with a larger radius, thereby providing users with diversified operation methods and effectively enhancing the practicability of the drawing compass.
- a drawing compass constructed in accordance with a seventh preferred embodiment of the present invention is substantially the same as that of the fifth preferred embodiment except for the following features.
- the engagement structure of the limiting portion 33F of the operating member 30F has multiple teeth arranged annularly, and the limiting hole 42F of the outer casing 40F has a toothed profile that matches the engagement structure of the limiting portion 33F in shape.
- the operating member 30F can be fixed or operated to freely swing relative to the outer casing 40F while the limiting portion 33F engages with or disengages from the limiting hole 42F, so that a user can selectively draw a smaller or larger circle/arc, thus providing users with different and diversified operation methods and effectively enhancing the practicability of the drawing compass.
- parts of the operating member 30, 30A, 30B, 30C, 30D, 30E, 30F are selectively limited by the up-and-down movement of the operating member 30, 30A, 30B, 30C, 30D, 30E, 30F relative to the outer casing 40, 40A, 40B, 40C, 40D, 40E, 40F, so that the swing range of the operating member 30, 30A, 30B, 30C, 30D, 30E, 30F can be freely adjusted to draw a circle or an arc, thereby enabling users to operate the drawing compass to draw large or small circles/arcs quickly and highly maneuverably, further greatly enhancing the diversity and practicality of operations of the drawing compass.
- the swing range can be automatically adjusted according to the radius of a circle or an arc to be drawn, so that the users can easily draw circles/arcs having different radiuses according to the users' needs.
- the symmetrically connecting structure between the moving device 10, 10B, 10C, 10D, 10E and the two legs 20, 20B, 20C, 20D, 20E and the linear movement of the moving device 10, 10B, 10C, 10D, 10E are adopted in the preferred embodiments of the present invention.
- the two linking rods 14, 14B, 14C, 14C', 14D are symmetrically connected to each other, or the moving device 10A, 10E has a C-like clamping structure, so that the two legs 20, 20A, 20B, 20C, 20D, 20E can be pivotally moved toward or away from each other more accurately and synchronously relative to the imaginary longitudinal first axis C 1 .
- the drawing compass of the present invention can be rotated on its center of gravity during use, thus providing a stable rotation effect for the drawing compass.
- the eccentric setting of the operating members 30, 30A, 30B can increase the force arm of rotation of the drawing compass to increase the torque of rotation, and the user can perform the circle drawing more smoothly, so that large or small circles/arcs can be quickly and highly maneuverably drawn.
- the structural relationships between the limiting space defined by the limiting sections 443C, 443D of the two half-shells 44C, 44D can prevent the users from making mistakes or accidently damaging the drawing compass.
- the imaginary longitudinal first axis C 1 and the imaginary longitudinal second axis C 2 of the present invention respectively refer to that each of the moving device10, 10A, 10B, 10C, 10D, 10E and the operating member 30, 30A, 30B, 30C, 30D, 30E, 30F has a virtual reference line for defining the relative positions of related components without restricting whether the overall shape of each of the moving device 10, 10A, 10B, 10C, 10D, 10E and the operating member 30, 30A, 30B, 30C, 30D, 30E, 30F itself is completely symmetrical or not.
- the two linking rods 14B of the moving device 10B are arranged symmetrically with respect to the imaginary longitudinal first axis C 1 , and an upper segment of the moving device 10B that is connected to the operating member 30B is not symmetrical with respect to the imaginary longitudinal first axis C 1 .
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Abstract
A drawing compass has an outer casing (40), a moving device (10), two legs (20), and an operating member (30). The moving device (10) is moveable up or down relative to the outer casing (40) and has a connecting portion (11) and two linking portions (12). An imaginary longitudinal first axis (C1) passes through the moving device (10). The legs (20) are connected to the outer casing (40) and connected to the linking portions (12), respectively, for pivotal movement toward or away from each other. The operating member (30) is lengthwise and has a connecting end (31), an operating end (32), and a limiting portion (33). The operating member (30) can freely swing on the connecting end (31). The moving device (10) is linked up with the two legs (20) to move the operating member (30) up or down relative to the outer casing (40).
Description
- This patent application claims the benefits of Taiwan patent application No.
108139727, filed on November 01, 2019 109106418, filed on February 27, 2020 - The present invention relates to a drawing compass, and more particularly to a drawing compass that can be rotated stably in operation.
- A conventional drawing compass is one of the writing stationeries for users to draw circular or arc-shaped lines. However, in general, when operating the conventional drawing compass, a user must use two fingers to hold a knob of the conventional drawing compass and make it roll between the fingers, making it difficult to strike a balance. The conventional drawing compass may easily slip off the user's fingers accidentally, causing inconvenience in use. Therefore, there were some improved structures, such as
CN Pub. No. 102152694B filed in China and titled "Compasses". The compasses have a body and an operating element. The body has two legs and a center drive connected to the two legs. The operating element is pivotably connected to a supporting element that is disposed on a top end of the center drive. The body with the supporting element can be tilted to make its central axis intersect a rotation axis of the operating element. It is convenient for the user to hold the operating element and execute strength for drawing a circle or an arc without making the supporting element roll between the user's fingers, but such tilt-swing operation is only suitable for drawing a large circle or arc rather than a small circle or arc. However, when the user wants to draw a small circle or arc, it is neither easy nor convenient to hold the operating element to operate the tiltably rotatable drawing compass because the user must remove the operating element from the supporting element and then hold and make the supporting element roll between the user's fingers for drawing a circle or an arc. In this way, the user must constantly combine or remove the operating element with or from the supporting element according to the sizes of required arcs or circles without an automatic adjustment mechanism, leading to operational inconvenience. - In addition, a drawing compass has been disclosed in
JP Patent No. 5620842 - The main objective of the present invention is to provide a drawing compass that can be operated stably, easily, and conveniently.
- The drawing compass in accordance with the present invention has an outer casing, a moving device, two legs, and an operating member. The outer casing has a limiting hole running through a top of the outer casing. The moving device is moveable up or down relative to the outer casing and has a connecting portion and two linking portions. An imaginary longitudinal first axis passes through the moving device. The connecting portion is located at a top of the moving device. The two linking portions are located at two opposite sides beside the imaginary longitudinal first axis, respectively. The two legs can be pivotally moved toward or away from each other to define an included angle therebetween, are connected to the outer casing, and are rotatably connected to the two linking portions, respectively. The operating member is lengthwise and has a connecting end, an operating end, and a limiting portion. The connecting end and the operating end are located away from each other lengthways, the limiting portion is disposed between the connecting end and the operating end, the operating end is disposed outside the outer casing, and the connecting end is rotatably connected to the connecting portion of the moving device to enable the operating member to freely swing the connecting end serving as a fulcrum. As the two legs are pivotally moved toward or away from each other, the moving device is moved to drive the operating member to move up or down lengthways relative to the outer casing.
- The drawing compass in accordance with the present invention has the following advantages.
- First, parts of the operating member are selectively limited by the up-and-down movement of the operating member relative to the outer casing, so that the swing range of the operating member can be freely adjusted to draw a circle or an arc, thereby enabling users to operate the drawing compass to draw large or small circles/arcs quickly and highly maneuverably, further greatly enhancing the diversity and practicality of operations of the drawing compass.
- Second, an exposed part of the operating member emerging from the limiting hole of the outer casing becomes longer as the radius of a circle or an arc to be drawn becomes larger, thereby shortening an unexposed part of the limiting portion submerging in the limiting hole, so that the swing range of the operating member is automatically adjusted to become larger accordingly. Therefore, the drawing compass of the present invention can be set according to the radius of a circle or an arc to be drawn to automatically adjust the swing range of the operating member, effectively solving the problem that the tilt-swing operating range of the conventional drawing compass cannot be adjusted. In this way, the drawing compass of the present invention can be used to freely select a required swing range of the operating member for drawing a circle or an arc, thus enabling users to quickly and highly maneuverably draw circles/arcs with a required radius, thus greatly enhancing the versatility and practicability of the drawing compass in operation.
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Fig. 1 is a perspective view of a drawing compass constructed in accordance with a first preferred embodiment of the present invention; -
Fig. 2 is an exploded perspective view of the drawing compass indicated inFig. 1 ; -
Fig. 3 is another exploded perspective view of the drawing compass indicated inFig. 2 ; -
Fig. 4 is a partially sectional side view of the drawing compass indicated inFig. 1 ; -
Fig. 5 is a partially enlarged exploded perspective view of parts of the drawing compass indicated inFig. 1 ; -
Fig. 6 is a partially exploded side view of the drawing compass indicated inFig. 1 in operation; -
Fig. 7 is another partially sectional side view of the drawing compass indicated inFig. 1 in operation; -
Fig. 8 is a perspective view of a drawing compass constructed in accordance with a second preferred embodiment of the present invention; -
Fig. 9 is an exploded perspective view of the drawing compass indicated inFig. 8 ; -
Fig. 10 is a partially sectional side view of the drawing compass indicated inFig. 8 ; -
Fig. 11 is a partially sectional side view of the drawing compass indicated inFig. 8 in operation; -
Fig. 12 is another partially sectional side view of the drawing compass indicated inFig. 8 ; -
Fig. 13 is a perspective view of a drawing compass constructed in accordance with a third preferred embodiment of the present invention; -
Fig. 14 is an exploded perspective view of the drawing compass indicated inFig. 13 ; -
Fig. 15 is a partially sectional side view of the drawing compass indicated inFig. 13 ; -
Fig. 16 is a partially sectional side view of the drawing compass indicated inFig. 13 in operation; -
Fig. 17 is another partially sectional side view of the drawing compass indicated inFig. 13 in operation; -
Fig. 18 is a perspective view of a drawing compass constructed in accordance with a fourth preferred embodiment of the present invention; -
Fig. 19 is an exploded perspective view of the drawing compass indicated inFig. 18 ; -
Fig. 20 is a side view of the drawing compass indicated inFig. 18 ; -
Fig. 21 is a partially sectional side view of the drawing compass indicated inFig. 18 ; -
Fig. 22 is a partially sectional side view of the drawing compass inFig. 18 in operation; -
Fig. 23 is another partially sectional side view of the drawing compass indicated inFig. 18 in operation; -
Fig. 24 is a partially enlarged perspective view of the drawing compass indicated inFig. 18 in operation; -
Fig. 25A is an exploded perspective view of another configuration of the drawing compass indicated inFig. 18 ; -
Fig. 25B is an enlarged sectional perspective view of a linking rod of the drawing compass indicated inFig. 25A ; -
Fig. 26 is a partially sectional side view of the drawing compass indicated inFig. 25A ;Fig. 27 is a perspective view of a drawing compass in accordance with a fifth preferred embodiment of the present invention; -
Fig. 28 is an exploded perspective view of the drawing compass indicated inFig. 27 ;Fig. 29 is a partially sectional side view of the drawing compass indicated inFig. 27 ;Fig. 30 is a partially sectional side view of the drawing compass indicated inFig. 27 in operation; -
Fig. 31 is another partially sectional side view of the drawing compass indicated inFig. 27 ; -
Fig. 32 is a perspective view of a drawing compass constructed in accordance with a sixth preferred embodiment of the present invention; -
Fig. 33 is an exploded perspective view of the drawing compass indicated inFig. 32 ;Fig. 34 is a partially sectional enlarged side view of the drawing compass indicated inFig. 32 ; -
Fig. 35 is a partially sectional side view of the drawing compass indicated inFig. 32 in operation; -
Fig. 36 is another partially sectional side view of the drawing compass inFig. 32 in operation; and -
Fig. 37 is a partially enlarged perspective view of a drawing compass constructed in accordance with a seventh preferred embodiment of the present invention in operation. - To learn more about the technical features and practical efficacy of the present invention, and to utilize the present invention in accordance with the specification, the detailed description of the preferred embodiments as shown in the drawings is disclosed as follows.
- With reference to
Figs. 1 to 4 , a drawing compass constructed in accordance with a first preferred embodiment of the present invention includes a movingdevice 10, twolegs 20, an operatingmember 30, and anouter casing 40. - The moving
device 10 is disposed in theouter casing 40 and moveable upwardly or downwardly relative to theouter casing 40. The movingdevice 10 has a connectingportion 11 and two linkingportions 12. An imaginary longitudinal first axis C1 passes through a center of the movingdevice 10. The connectingportion 11 is located at a top of the movingdevice 10, deviating from the imaginary longitudinal first axis C1 of the movingdevice 10, and may be a concave portion or a convex portion. The two linkingportions 12 are symmetrically located at two opposite sides beside the imaginary longitudinal first axis C1 of the movingdevice 10, respectively, and can pivotally move toward or away from the imaginary longitudinal first axis C1 of the movingdevice 10 at the same time. Furthermore, the movingdevice 10 has twohalf bodies 13 connected to each other, the connectingportion 11 is disposed between the twohalf bodies 13, and the twohalf bodies 13 are connected to each other bymultiple grooves 131 andprotrusions 132. Also, each of the two linkingportions 12 of the movingdevice 10 has aswingable linking rod 14, each of which has a swing end located away from the operatingmember 30 and is located between the twohalf bodies 13. - Preferably, the moving
device 10 has a guiding structure facing outwardly, and theouter casing 40 has a positioning structure facing inwardly and corresponding to the guiding structure of the movingdevice 10. When the movingdevice 10 is moved upwardly or downwardly relative to theouter casing 40, the guiding structure can move along the positioning structure to improve the stability of linear movement of the movingdevice 10. The linear movement of the movingdevice 10 is parallel to the imaginary longitudinal first axis C1 of the movingdevice 10. In the first preferred embodiment of the present invention, the movingdevice 10 has two opposite outer sides, the guiding structure is formed of two guidingportions 15 located on the two opposite outer sides of the movingdevice 10, respectively, and each of the guidingportions 15 is an elongated rib located on an outer side of one of the twohalf bodies 13. - The two
legs 20 can be pivotally moved toward or away from each other with respect to theouter casing 40 and are swingably connected to the two linkingportions 12 of the movingdevice 10, respectively. Each of the twolegs 20 has apivotal portion 21 and acoaxial portion 22, both of which are disposed on a top thereof. Each of thepivotal portions 21 is located outside thecorresponding leg 20 with respect to the correspondingcoaxial portion 22 and is pivotally connected to one of the two linkingportions 12 of the movingdevice 10. Furthermore, each of thepivotal portions 21 of the twolegs 20 is pivotally connected to one of the swing ends of the two linkingrods 14 of the movingdevice 10. Thecoaxial portions 22 of the twolegs 20 overlap and are coaxially pivotally connected to each other to enable bottom ends of the twolegs 20 to move toward or away from each other. In addition, due to the symmetrical configuration of the two linkingportions 12 of the movingdevice 10 relative to the imaginary longitudinal first axis C1 and the linear movement of the movingdevice 10, the twolegs 20 can be pivotally moved toward or away from each other synchronously with respect to the imaginary longitudinal first axis C1 more accurately. In other words, an included angle defined between the twolegs 20 relative to the imaginary longitudinal first axis C1 can keep symmetrically consistent, so that the drawing compass of the present invention can be operated stably on its center of gravity. - The operating
member 30 is lengthwise and has a connectingend 31 and an operatingend 32. The connectingend 31 and the operatingend 32 are located away from each other lengthways. The operatingmember 30 further has a limitingportion 33 disposed between the connectingend 31 and the operatingend 32. The operatingend 32 of the operatingmember 30 is disposed outside theouter casing 40. The connectingend 31 of the operatingmember 30 is rotatably connected to the connectingportion 11 of the movingdevice 10, so that the operatingmember 30 can freely swing on the connectingend 31 serving as a fulcrum. In addition, when the connectingportion 11 is a concave portion, the connectingend 31 of the operatingmember 30 is a spherical body matching the connectingportion 11 in shape. The limitingportion 33 can be a tapered structure that has an outer diameter gradually increasing from the connectingend 31 to the operatingend 32. Since an upper part of the limitingportion 33, adjacent to the operatingend 32, is thicker than the other lower part of the limitingportion 33, higher rigidity can be provided to avoid any adverse effect on the structural strength of the operatingmember 30 after the drawing compass has been operated for multiple times. Also, the outer diameter of the lower part of the limitingportion 33, near the connectingend 31, is relatively smaller, so the volume of the connectingportion 11 of the movingdevice 10 can be reduced accordingly, thereby reducing the overall volume of the movingdevice 10. Preferably, the operatingend 32 can be a block or a plate having a relatively larger volume for easy holding. - With reference to
Fig. 4 again, the imaginary longitudinal first axis C1 passing through the movingdevice 10 is parallel to the lengthwise operatingmember 30, an imaginary longitudinal second axis C2 passes through the connectingend 31 and the limitingportion 33 of the operatingmember 30 to be parallel to the lengthwise operatingmember 30, and an eccentric distance E is formed between the two imaginary longitudinal axes C1, C2. Furthermore, one of thepivotal portions 21 of the twolegs 20 is located closer to the imaginary longitudinal second axis C2 than the imaginary longitudinal first axis C1 and thecorresponding leg 20 is defined as an eccentric side leg, and a linear distance S is defined between thepivotal portion 21 and thecoaxial portion 22 of theeccentric side leg 20. Preferably, the eccentric distance E is less than or equal to the linear distance S. In detail, with reference toFigs. 4 and5 , an imaginary first extending line P1 passes through the centers of thecoaxial portions 22 of the twolegs 20, being orthogonal to the imaginary longitudinal first axis C1. An imaginary second extending line P2 passes through the center of thepivotal portion 21 of theeccentric side leg 20. The imaginary first extending line P1 is parallel to the imaginary second extending line P2, and the linear distance S is a vertical distance between the imaginary first extending line P1 and the imaginary second extending line P2. Since the eccentric distance E is less than or equal to the linear distance S, under an ideal condition, that is, regardless of factors like shape or volume, the connectingend 31 of the operatingmember 30 is located right above thepivotal portion 21 of theeccentric side leg 20, making it the easiest to execute strength for drawing a circle or an arc. If the eccentric distance E is larger than the linear distance S, it will be not easy to execute strength for drawing a small circle or arc. Specifically, the twolegs 20 are a pin leg and a pen leg, respectively, the connectingend 31 of the operatingmember 30 is connected to the connectingportion 12 corresponding to the pen leg; that is, theeccentric side leg 20 is a pen leg. - The
outer casing 40 is connected to the twolegs 20 and has two inner sides facing each other, a fixingmember 41, and a limitinghole 42. The fixingmember 41 is inserted through thecoaxial portions 22 of the twolegs 20 to coaxially connect the twolegs 20 with theouter casing 40. The limitinghole 42 runs through a top of theouter casing 40 to enable the operatingend 32 of the operatingmember 30 to be located outside the limitinghole 42 of theouter casing 40. The movingdevice 10 is moved along the imaginary longitudinal first axis C1, while the twolegs 20 are pivotally moved toward or away from each other, to drive the operatingmember 30 to move upwardly or downwardly lengthways relative to theouter casing 40, so that parts of the limitingportion 33 of the operatingmember 30 can selectively contact an inner sidewall of the limitinghole 42 of theouter casing 40 in operation. The connectingportion 11 of the movingdevice 10 deviates from the imaginary longitudinal first axis C1, the imaginary longitudinal second axis C2 passes through the connectingportion 11, and is straightly opposite to the limitinghole 42 of theouter casing 40, and the connectingportion 11 is connected to the connectingend 31 of the operatingmember 30. - With reference to
Figs. 2 and3 , as for a configuration that theouter casing 40 has the positioning structure corresponding to the guiding structure of the movingdevice 10, the positioning structure is disposed on the two inner sides of theouter casing 40 and has twopositioning portions 43 corresponding to the two guidingportions 15, respectively. Each of the twopositioning portions 43 is connected to one of the two guidingportions 15 of the movingdevice 10, so that each of the two guidingportions 15 is moved along thecorresponding positioning portion 43 when the movingdevice 10 is moved with the pivotal movement of the twolegs 20, thus providing a guiding effect of up-and-down linear movement for the movingdevice 10. In addition, theouter casing 40 may have two half-shells 44 connected to each other, and the two half-shells 44 are coaxially connected to thecoaxial portions 22 of the twolegs 20 by the fixingmember 41. - When the included angle of the two
legs 20 of the drawing compass of the first preferred embodiment of the present invention is zero degree, the limitingportion 33 of the operatingmember 30 fully submerges in the limitinghole 42 of theouter casing 40. With reference toFigs. 1 and6 , when a user makes the twolegs 20 pivotally move away from each other, the movingdevice 10 is linked up with the twolegs 20 to move along the lengthwise operatingmember 30 relative to theouter casing 40 to further move the operatingmember 30 upwardly. In the meantime, the limitingportion 33 of the operatingmember 30 gradually emerges upwardly from the limitinghole 42 of theouter casing 40, and a swing range of the operatingmember 30 is positively correlated with the included angle of the twolegs 20. In other words, an exposed part of the operatingmember 30 emerging from the limitinghole 42 of theouter casing 40 becomes longer as the radius of a circle or an arc to be drawn becomes larger, thereby shortening an unexposed part of the limitingportion 33 submerging in the limitinghole 42, so that the swing range of the operatingmember 30 is automatically adjusted to become larger accordingly. Therefore, the drawing compass of the present invention can be set according to the radius of a circle or an arc to be drawn to automatically adjust the swing range of the operatingmember 30, effectively solving the problem that the tilt-swing operating range of the conventional drawing compass cannot be adjusted. In this way, the drawing compass of the present invention can be used to freely select a required swing range of the operating member for drawing a circle or an arc, thus enabling users to quickly and highly maneuverably draw a circle or an arc with a required radius, thus greatly enhancing the versatility and practicability of the drawing compass in operation. - As for the operation of the drawing compass of the first preferred embodiment of the present invention, when the two
legs 20 are pivotally moved away from each other to make the included angle therebetween smaller as shown inFig. 6 , the unexposed part of the operatingmember 30 submerging in theouter casing 40 is major and the exposed part of the same is minor, so that a very small swing range can be made. In this way, a user can hold the operatingmember 30 to draw a circle or an arc with a smaller radius. Referring toFig. 7 , when the included angle of the twolegs 20 is set larger, the two linkingrods 14 are linked up with the twolegs 20 to move the movingdevice 10 upwardly along theouter casing 40, and each of the two guidingportions 15 of the movingdevice 10 can move upwardly along thecorresponding positioning portions 43 as shown inFigs. 2 and3 , thereby driving the operatingmember 30 to move upwardly relative to theouter casing 40. In the meantime, the exposed part of the limitingportion 33 of the operatingmember 30 emerging from the limitinghole 42 of theouter casing 40 becomes longer, and the swing range of the operatingmember 30 becomes larger and the operatingmember 30 can be operated to tilt and swing freely with respect to the imaginary longitudinal first axis C1, so that the user can hold the operatingmember 30 of the drawing compass of the present invention to draw a circle or an arc with a larger radius. In addition, when the user intends to draw a smaller circle or arc, the user can also choose to hold the two half-shells 44 instead of theouter casing 40. Therefore, the drawing compass of the first preferred embodiment of the present invention can be used to draw large or small circles/arcs having various radiuses quickly and highly maneuverably, thus providing users with diversified operation methods and effectively enhancing the practicability of the drawing compass. - As for the operation of the drawing compass of the first preferred embodiment of the present invention, despite that the radius of a circle or an arc to be drawn is small as shown in
Fig. 6 or is large as shown inFig. 7 , the eccentric distance E is formed between the imaginary longitudinal second axis C2 and the imaginary longitudinal first axis C1, so that a force arm of the drawing compass of the present invention is increased and the torque of rotation in the process of drawing a circle or an arc is also increased, thus further enabling the user to draw circles or arcs more smoothly, especially for large or small circles/arcs that can be drawn quickly and highly maneuverably. - With reference to
Figs. 8 to 10 , a drawing compass constructed in accordance with a second preferred embodiment of the present invention is substantially the same as that of the first preferred embodiment except for the following features. In the second preferred embodiment of the drawing compass, the movingdevice 10A does not have the two linkingrods 14 and is an elastic C-like structure. Alternatively, the movingdevice 10A can be shaped like another geometric figure (e.g. triangle, quadrilateral, or polygon) having an opening. Each of the two linkingportions 12A of the movingdevice 10A, located away from the operatingmember 30A, is a swing end, and top ends of the twolegs 20A are rotatably connected to the swing ends of the two linkingportions 12A, respectively. For example, the movingdevice 10A is a flexible C-like clamp structure, each of the swing ends of the movingdevice 10A has a clampingportion 16A, and the top ends of the twolegs 20A are pivotally connected to theclamping portions 16A of the two linkingportions 12A of the movingdevice 10A, respectively. - As regards the operation of the drawing compass of the second preferred embodiment of the present invention, when the included angle of the two
legs 20A is set smaller as shown inFig. 11 , the unexposed part of the limitingportion 33A of the operatingmember 30 submerging in the limitinghole 42A of theouter casing 40A is major and the exposed part of the same is minor, so that a very small swing range can be made. In this way, the user can hold the operatingmember 30A to draw a circle or an arc with a smaller radius. Referring toFig. 12 , the included angle of the twolegs 20 is set large, the operatingmember 30A is linked up with the twolegs 20 to move the movingdevice 10A upwardly relative to theouter casing 40, the exposed part of the limitingportion 33A of the operatingmember 30A emerging from the limitinghole 42A of theouter casing 40A becomes longer to make the unexposed part of the same shorter, so that the operatingmember 30A can be operated to tilt and swing freely with respect to the imaginary longitudinal first axis C1. In this way, the user can hold the operatingmember 30A of the drawing compass of the second preferred embodiment of the present invention to draw a circle or an arc with a larger radius, thus providing users with diversified operation methods and effectively enhancing the practicability of the drawing compass. - With reference to
Figs. 13 to 15 , a drawing compass constructed in accordance with a third preferred embodiment of the present invention is substantially the same as that of the first preferred embodiment except for the following features. In the third preferred embodiment of the drawing compass, theouter casing 40B has a holdingportion 45B formed on the top of theouter casing 40B and protruding along thelengthwise operating member 30B. The holdingportion 45B can be used to limit the free swing of the operatingmember 30B relative to theouter casing 40B, and the holdingportion 45B can be integrally formed with one of the two half-shells 44B. The limitinghole 42B is formed inside the holdingportion 45B, and the operatingend 32B of the operatingmember 30B is located outside the holdingportion 45B to enable parts of the limitingportion 33B of the operatingmember 30B to selectively contact the inner sidewall of the limitinghole 42B. In addition, the drawing compass further has acap 50B, and thecap 50B is selectively connected to a bottom of one or the other of the twolegs 20B or the operatingend 32B of the operatingmember 30B. - When the included angle of the two
legs 20B of the drawing compass of the third preferred embodiment of the present invention is zero degree, the limitingportion 33B of the operatingmember 30B is fully moved into the limitinghole 42B of theouter casing 40B. With reference toFigs. 13 and16 , when a user makes the twolegs 20B pivotally move away from each other, the twolegs 20B will force the movingdevice 10B to move along thelengthwise operating member 30B relative to theouter casing 40B to drive the operatingmember 30B to move upwardly. In the meantime, the limitingportion 33B of the operatingmember 30B gradually emerges upward from the limitinghole 42B of theouter casing 40B, and the swing range of the operatingmember 30B is positively correlated to the included angle of the twolegs 20B. In other words, the exposed part of the operatingmember 30B emerging from the limitinghole 42B of theouter casing 40B becomes longer as the radius of a circle or an arc to be drawn becomes larger, so that the swing range of the operatingmember 30B is automatically adjusted and increased accordingly. Therefore, the drawing compass of the present invention can be set according to the radius of the circle/arc to automatically adjust the swing range of the operatingmember 30B. - As for the operation of the drawing compass of the third preferred embodiment of the present invention, when the included angle is set smaller as shown in
Fig. 16 , the unexposed part of the limitingportion 33B of the operatingmember 30B submerging in the holdingportion 45B of theouter casing 40B is major and the exposed part of the same is minor, so that a very small swing range can be made. In this way, the user can hold the operatingmember 30B to draw a circle or an arc with a smaller radius. Referring toFig. 17 , when the included angle of the twolegs 20B is set larger, the two linkingrods 14B are linked up with the twolegs 20B to move the movingdevice 10B upwardly relative to theouter casing 40B, and meanwhile each of the two guidingportions 15B of the movingdevice 10B moves upwardly along thecorresponding positioning portion 43B as shown inFig. 14 , thereby driving the operatingmember 30B to move upwardly relative to theouter casing 40B. In the meantime, the exposed part of the limitingportion 33B of the operatingmember 30B emerging from the holdingportion 45B of theouter casing 40B becomes longer, and the swing range of the operatingmember 30B becomes larger and the operatingmember 30B can be operated to tilt and swing freely with respect to the imaginary longitudinal first axis C1, so that the user can hold the operatingmember 30B of the drawing compass of the present invention to draw a circle or an arc with a larger radius. - With reference to
Fig. 14 , in the third preferred embodiment of the drawing compass of the present invention, the bottom of one of the twolegs 20B has a firstengaging structure 24B, the operatingmember 30B has a secondengaging structure 34B formed on an external surface of the exposed part of the operatingelement 30 B and located close to an opening of the holdingportion 45B, and thecap 50B has a thirdengaging structure 51B. The thirdengaging structure 51B selectively engages with the firstengaging structure 24B or the secondengaging structure 34B to connect thecap 50B with the twolegs 20B or the operatingmember 30B. In this way, in addition to holding the operatingend 32B of the operatingmember 30B, the user can also hold thecap 50B to draw a circle or an arc via the engagement between the thirdengaging structure 51B and the secondengaging structure 34B and further integral coordination between thecap 50B and the operatingmember 30B. Consequently, thecap 50B not only increases the holding stability during circle/arc drawing, but also provides a protective effect for the drawing compass by covering the bottoms of the twolegs 20B when the drawing compass is not in use. - With reference to
Figs. 18 to 21 , a drawing compass constructed in accordance with a fourth preferred embodiment of the present invention is substantially the same as the third preferred embodiment except for the following features. In the fourth preferred embodiment of the drawing compass, there is no eccentric distance between the movingdevice 10C and the connectingend 31C of the operatingmember 30C. In other words, the imaginary longitudinal first axis C1 and the imaginary longitudinal second axis C2 fully overlap each other. Furthermore, the twohalf bodies 13C of the movingdevice 10C are connected to each other by a concavo-convex configuration formed ofmultiple grooves multiple protrusions 1321,32C', and the two half-shells 44C of theouter casing 40C are connected to each other by multiple connectingholes 441C and multiple connectingrods 442C. In addition, each of the two half-shells 44C has an arc-shaped limitingsection 443C formed on a lower segment of the half-shell 44C. When theouter casing 40C is connected to the twolegs 20C, the two limitingsections 443C can jointly define a limiting space for limiting the included angle of the twolegs 20C relative to theouter casing 40C. - Furthermore, with reference to
Figs. 18 and21 , in the fourth preferred embodiment of the present invention, the limitingportion 33C of the operatingmember 30C has a first length L1, the holdingportion 45C has a second length L2, and the movingdevice 10C has a maximum displacement D. The first length L1 is not less than the sum of the second length L2 and the maximum displacement D, that is, L1 ≧ L2 +D. Furthermore, a gap is formed between the limitingportion 33C of the operatingmember 30C and an inner sidewall of the holdingportion 45C. Preferably, the gap is not less than 0.05 millimeters. - When the included angle of the two
legs 20C of the drawing compass of the fourth preferred embodiment of the present invention is zero degree, the limitingportion 33C of the operatingmember 30C fully submerges in the limitinghole 42C of theouter casing 40C. With reference toFigs. 18 and22 , when the twolegs 20C are pivotally moved away from each other, the movingdevice 10C is linked up with the twolegs 20C to move the operatingmember 30C upwardly lengthways relative to theouter casing 40C. In the meantime, the limitingportion 33C of the operatingmember 30C gradually emerges upwardly from the limitinghole 42C of theouter casing 40C. The swing range of the operatingmember 30C is positively correlated with the opening angle of the twolegs 20C; that is, the exposed part of the operatingmember 30C emerging from the limitinghole 42C of theouter casing 40C becomes longer as the radius of a circle or an arc to be drawn becomes larger, so that the swing range of the operatingmember 30C is automatically adjusted and increased accordingly. Therefore, the drawing compass of the present invention can be set according to the radius of the circle/arc to automatically adjust the swing range of the operatingmember 30C, effectively solving the problem that the tilt-swing operating range of the conventional drawing compass cannot be adjusted. In this way, the drawing compass of the present invention can enable users to quickly and highly maneuverably draw a circle or an arc with a required radius, thus greatly enhancing the versatility and practicability of operation of the drawing compass. - With reference to
Figs. 21 to 23 , taking the gap between the limitingportion 33C of the operatingmember 30C and a top edge of the limitinghole 42C being 0.05 millimeters as an example to illustrate that as a lifting distance of the operatingmember 30C is longer, the swing range of the operatingmember 30C becomes larger. For example, when the operatingmember 30C is lifted by 2 millimeters, the operatingmember 30C can be tilted for an angle of 1.36 degrees relative to an imaginary central axis of the limitinghole 42C, and when the operatingmember 30C is lifted by 9 millimeters, the operatingmember 30C can be tilted for an angle of 2.05 degrees relative to the central axis of the limitinghole 42C. - Regarding the operation of the drawing compass of the fourth preferred embodiment of the present invention, when the included angle of the two
legs 20C is set smaller as shown inFig. 22 , the unexposed part of the operatingmember 30C submerging in the holdingportion 45C of theouter casing 40C is major and the exposed part of the same is minor, so that a very small swing range can be made. In this way, the user can hold the operatingmember 30C to draw a circle or an arc with a smaller radius. Referring toFigs. 23 and24 , when the included angle of the twolegs 20C is set larger, the two linkingrods 14C are linked up with the twolegs 20C to move the movingdevice 10C upwardly relative to theouter casing 40C, and each of the two guidingportions 15C of the movingdevice 10C moves upwardly along thecorresponding positioning portion 43C as shown inFig. 19 , thereby driving the operatingmember 30C to move upwardly relative to theouter casing 40C. In the meantime, the exposed part of the limitingportion 33C of the operatingmember 30C emerging from the limitinghole 42C of theouter casing 40C becomes longer, so that the swing range of the operatingmember 30C becomes larger and the operatingmember 30C can be operated to tilt and swing freely with respect to theouter casing 40C and the user can hold the operatingmember 30C of the drawing compass of the present invention to draw a circle or an arc with a larger radius. When the user intends to draw a smaller circle, the user can choose to hold the holdingportion 45C. Therefore, the drawing compass of the fourth preferred embodiment of the present invention can draw large or small circles/arcs of various radiuses quickly and highly maneuverably, providing users with diversified operation methods and effectively enhancing the practicability of the drawing compass. - As for the operation of the fourth preferred embodiment of the present invention in use, with reference to
Figs. 23 and24 , the limiting space defined between the limitingsections 443C of the two half-shells 44C of theouter casing 40C can be used to limit the included angle of the twolegs 20C relative to theouter casing 40C, thus effectively keeping the included angle of the twolegs 20C within an appropriate range. - In addition, when the user holds the operating
member 30C to rotate the drawing compass, the twolegs 20C are symmetrically connected to the movingdevice 10C by the two linkingrods 14C, so that the drawing compass of the present invention can be rotated on its center of gravity without deviating from the rotation and slipping off the user's fingers, and the user can rotate the drawing compass steadily. - With reference to
Figs. 25A and26 , in the fourth preferred embodiment of the present invention, the limitingportion 33C of the operatingmember 30C has anengagement structure 33C' disposed on an external surface of the limitingportion 33C adjacent to the operatingend 32C, and an outer diameter of theengagement structure 33C' is larger than either of those of other parts of the limitingportion 33C. Theengagement structure 33C' can be shaped like a triangle, a polygon, a tooth, or a groove, and the top end of the limitinghole 42C' of theouter casing 40C has an inner peripheral surface that matches theengagement structure 33C' of the operatingmember 30C in shape, so that parts of the limitingportion 33C of the operatingmember 30C can selectively engage with the limitinghole 42C' of theouter casing 40C. When the included angle of the twolegs 20C is smaller or zero degree, theengagement structure 33C' of the limitingportion 33C engages with the limitinghole 42C' to enable the user to draw a smaller circle or an arc, thus disabling the operatingmember 30C from free swing. The operatingmember 30C can be automatically enabled for free swing while the operatingmember 30C is lifted upwardly to enable theengagement structure 33C' of the limitingportion 33C to escape from the limitinghole 42C'. In addition, the outer diameter of the limitingportion 33C keeps uniform from a lower end of theengagement structure 33C' toward the connectingend 31C. - In addition, an end of each of the two linking
rods 14C' of the movingdevice 10C that is pivotally connected to thecorresponding leg 20C is an elastically deformable engaging structure. With reference toFigs. 25B and26 , each of the linkingrods 14C' has a firstpivotal end 141C' and an elastic secondpivotal end 142C', both of which are located away from each other, each of the first pivotal ends 141C' has a through hole running therethrough, each of the second pivotal ends 142C' has aslot 143C', and each secondpivotal end 142C' has two columns protruding from two opposite outer surfaces of the secondpivotal end 142C', respectively. The first pivotal ends 141C' of the two linkingrods 14C' are rotatably clamped between the twohalf bodies 13C of the movingdevice 10C. Theprotrusions 132C' of the twohalf bodies 13C are inserted through the through holes of the two first pivotal ends 141C' and then into thegrooves 131C' and, further coaxially interconnecting theprotrusions 132C' and thegrooves 131C'. The two second pivotal ends 142C' of the two linkingrods 14C' are elastically deformably engaged with thepivotal portions 21C on the tops of the twolegs 20C, respectively. In the meantime, the two columns of each secondpivotal end 142C' are mounted in two pivot holes of thepivotal portion 21C of thecorresponding leg 20, respectively, to pivotally connect the linkingrod 14C with thecorresponding leg 20C without any pivot pin, thus reducing the overall number of components and further decreasing the manufacturing cost. - With reference to
Figs. 27 to 29 , a drawing compass constructed in accordance with a fifth preferred embodiment of the present invention is substantially the same as that of the fourth preferred embodiment except for the following features. In the fifth preferred embodiment of the drawing compass, theouter casing 40D does not have the holdingportion 45C as theouter casing 40C of the fourth preferred embodiment of the drawing compass, the limitingportion 33D of the operatingmember 30 has two parts, one of which defines an engagement structure located adjacent to the operatingend 32D and having an outer diameter larger than that of the other part of the limitingportion 33D. Furthermore, the engagement structure has a polygonal external surface. Preferably, the engagement structure is a hexagonal column and has a regular hexagonal cross-section perpendicular to thelengthwise operating member 30D. In addition, the other part of the limitingportion 33D can be hexagonal tapered. The limitinghole 42D runs through the top of theouter casing 40D and has an inner peripheral surface that matches the engagement structure of the operatingmember 30D in shape. In this way, the limitingportion 33D of the operatingmember 30D can selectively engage with the limitinghole 42D of theouter casing 40D as the operatingmember 30D moves up or down. - When the included angle of the two
legs 20D of the drawing compass of the fifth preferred embodiment of the present invention is set zero or smaller as shown inFigs. 29 and30 , the limitingportion 33D of the operatingmember 30D engages with the limitinghole 42D of theouter casing 40D, so that the operatingmember 30D submerges in the limitinghole 42D of theouter casing 40D without free swing relative to theouter casing 40D and a user can draw a circle or an arc with a smaller radius. Furthermore, with reference toFig. 31 , the user can also set the included angle of the twolegs 20D larger, so that the two linkingrods 14D are linked up with the twolegs 20D to move the twohalf bodies 13D upward with respect to theouter casing 40D. With reference toFig. 28 , each of the two guidingportions 15D of the movingdevice 10D can move upwardly along thecorresponding positioning portion 43D, thereby driving the operatingmember 30D to stably move upwardly relative to theouter casing 40D, so that the engagement structure of the limitingportion 33D of the operatingmember 30D disengages from the limitinghole 42D of theouter casing 40D. In the meantime, the operatingmember 30D can be operated to tilt and swing freely relative to theouter casing 40D, and the user can hold the operatingmember 30D and to draw a circle or an arc with a larger radius, thereby providing users with diversified operation methods and effectively enhancing the practicability of the drawing compass. - With reference to
Figs. 32 to 34 , a drawing compass constructed in accordance a sixth preferred embodiment of the present invention is substantially the same as that of the fourth preferred embodiment except for the following features. In the sixth preferred embodiment of the drawing compass, the movingdevice 10E does not have the two linkingrods 14C of the movingdevice 10C of the fourth preferred embodiment, and the movingdevice 10E is an elastic C-like clamping structure. Alternatively, the movingdevice 10E can be another geometric figure (e.g. triangle, quadrilateral or polygon) having an opening, each of the two linkingportions 12E of the movingdevice 10E has a clampingportion 16E, and each of the clampingportions 16E has two clamping cylindrical protrusions spaced from each other. The top ends of the twolegs 20E are pivotally connected to each other and are connected to theclamping portions 16E of the two linkingportions 12E of the movingdevice 10E, respectively, and each of the twolegs 20E has a mountingpost 23E mounted between the two cylindrical protrusions of one of the two clampingportions 16E to engage with the clampingportion 16E of the corresponding linkingportion 12E of the movingdevice 10E. Furthermore, the limitingportion 33E of the operatingmember 30E has a polygonal engagement structure, and the limitinghole 42E runs through the top of the holdingportion 45E and has an inner peripheral surface that matches the engagement structure of the operatingmember 30E in shape. In this way, the limitingportion 33E of the operatingmember 30E can be selectively engaged with the limitinghole 42E of theouter casing 40E. - When the included angle of the two
legs 20E of the drawing compass of the sixth preferred embodiment of the present invention is set zero or smaller as shown inFig. 35 , the limitingportion 33E of the operatingmember 30E engages with the limitinghole 42E of theouter casing 40E, and the operatingmember 30E submerges in the limitinghole 42E of theouter casing 40E without free swing relative to theouter casing 40E, so that a user can hold the operatingmember 30E to draw a circle or an arc with a smaller radius. Furthermore, with reference toFig. 36 , when the user sets the included angle of the twolegs 20E larger, the operatingmember 30E is linked up with the twolegs 20E and to move the movingdevice 10E upwardly relative to theouter casing 40E, so that the engagement structure of the limitingportion 33E of the operatingmember 30E is disengaged from the limitinghole 42E of theouter casing 40E. In this way, the operatingmember 30E can be operated to tilt and swing freely relative to theouter casing 40E, and the user can hold the operatingmember 30E to draw a circle or an arc with a larger radius, thereby providing users with diversified operation methods and effectively enhancing the practicability of the drawing compass. - With reference to
Fig. 37 , a drawing compass constructed in accordance with a seventh preferred embodiment of the present invention is substantially the same as that of the fifth preferred embodiment except for the following features. In the seventh preferred embodiment of the drawing compass, the engagement structure of the limitingportion 33F of the operatingmember 30F has multiple teeth arranged annularly, and the limitinghole 42F of theouter casing 40F has a toothed profile that matches the engagement structure of the limitingportion 33F in shape. In this way, the operatingmember 30F can be fixed or operated to freely swing relative to theouter casing 40F while the limitingportion 33F engages with or disengages from the limitinghole 42F, so that a user can selectively draw a smaller or larger circle/arc, thus providing users with different and diversified operation methods and effectively enhancing the practicability of the drawing compass. - According to the above-mentioned features and structural relationships, in the drawing compass of the present invention, parts of the operating
member member outer casing member legs - Further, the symmetrically connecting structure between the moving
device legs device rods device legs members sections shells - The imaginary longitudinal first axis C1 and the imaginary longitudinal second axis C2 of the present invention respectively refer to that each of the moving device10, 10A, 10B, 10C, 10D, 10E and the operating
member device member legs 20B, the two linkingrods 14B of the movingdevice 10B are arranged symmetrically with respect to the imaginary longitudinal first axis C1, and an upper segment of the movingdevice 10B that is connected to the operatingmember 30B is not symmetrical with respect to the imaginary longitudinal first axis C1.
Claims (20)
- A drawing compass, characterized in that the drawing compass comprises:an outer casing (40, 40A, 40B, 40C, 40D, 40E, 40F) having a limiting hole (42, 42A, 42B, 42C, 42C', 42D, 42E, 42F) running through a top of the outer casing (40, 40A, 40B, 40C, 40D, 40E, 40F);a moving device (10, 10A, 10B, 10C, 10D, 10E) moveable up or down relative to the outer casing (40, 40A, 40B, 40C, 40D, 40E, 40F), an imaginary longitudinal first axis (C1) passing through the moving device (10, 10A, 10B, 10C, 10D, 10E), and the moving device (10, 10A, 10B, 10C, 10D, 10E) havinga connecting portion (11, 11D) located at a top of the moving device (10, 10A, 10B, 10C, 10D, 10E); andtwo linking portions (12, 12A, 12D, 12E) located at two opposite sides beside the imaginary longitudinal first axis (C1), respectively;two legs (20, 20A, 20V, 20C, 20D, 20E) pivotally movable toward or away from each other, connected to the outer casing (40, 40A, 40B, 40C, 40D, 40E, 40F), and rotatably connected to the two linking portions (12, 12A, 12D, 12E) of the moving device (10, 10A, 10B, 10C, 10D, 10E), respectively; anda lengthwise operating member (30, 30A, 30B, 30C, 30D, 30E, 30F) having a connecting end (31, 31C, 31D), an operating end (32, 32B, 32C, 32D), and a limiting portion (33, 33A, 33B, 33C, 33D, 33E, 33F);wherein the connecting end (31, 31C, 31D) and the operating end (32, 32B, 32C, 32D) are located away from each other lengthways, the limiting portion (33, 33A, 33B, 33C, 33D, 33E, 33F) is disposed between the connecting end (31, 31C, 31D) and the operating end (32, 32B, 32C, 32D), the operating end (32, 32B, 32C, 32D) is disposed outside the outer casing (40, 40A, 40B, 40C, 40D, 40E, 40F), the connecting end (31, 31C, 31D) is rotatably connected to the connecting portion (11, 11D) of the moving device (10, 10A, 10B, 10C, 10D, 10E) to enable the operating member (30, 30A, 30B, 30C, 30D, 30E, 30F) to freely swing on the connecting end (31, 31C, 31D), and the moving device (10, 10A, 10B, 10C, 10D, 10E) is linked up with the two legs (20, 20A, 20B, 20C, 20D, 20E) to move the operating member (30, 30A, 30B, 30C, 30D, 30E, 30F) up or down relative to the outer casing (40, 40A, 40B, 40C, 40D, 40E, 40F) lengthways.
- The drawing compass as claimed in claim 1, wherein the two linking portions (12, 12A, 12D, 12E) of the moving device (10, 10A, 10D, 10E) are symmetrically arranged with respect to the imaginary longitudinal first axis (C1).
- The drawing compass as claimed in claim 1, wherein
the moving device (10, 10A, 10B, 10C, 10D, 10E) further comprises a guiding structure facing outwardly; and
the outer casing (40, 40A, 40B, 40C, 40D, 40E, 40F) further comprises a positioning structure facing inwardly and corresponding to the guiding structure of the moving device (10, 10A, 10B, 10C, 10D, 10E); and
when the moving device (10, 10A, 10B, 10C, 10D, 10E) is moved upwardly or downwardly relative to the outer casing (40, 40A, 40B, 40C, 40D, 40E, 40F), the guiding structure is moved along the positioning structure. - The drawing compass as claimed in claim 1, wherein the limiting position (33, 33C, 33D, 33E, 33F) of the operating member (30, 30C, 30D, 30E, 30F) is tapered to comprise an outer diameter gradually increasing from the connecting end (31, 31C, 31D) to the operating end (32, 32B, 32C, 32D).
- The drawing compass as claimed in claim 1, wherein
the outer casing (40B, 40C, 40E) further comprises a holding portion (45B, 45C, 45E) formed on the top of the outer casing (40B, 40C, 40E) and protruding outward along the lengthwise operating member (30B, 30C, 30E) for limiting a swing range of the operating member (30B, 30C, 30E) relative to the outer casing (40B, 40C, 40E);
the limiting hole (42B, 42C, 42E) is formed in the holding portion (45B, 45C, 45E); and
the operating end (32B, 32C) of the operating member (30B, 30C, 30E) is located outside the holding portion (45B, 45C, 45E). - The drawing compass as claimed in claim 5, wherein
the limiting portion (33C) of the operating member (30C) further comprises a first length (L1);
the holding portion (45C) further comprises a second length (L2);
the moving device (10C) further comprises a maximum displacement (D); and
the first length (L1) is not less than a sum of the second length (L2) and the maximum displacement (D). - The drawing compass as claimed in claim 5, wherein a gap is formed between an outer sidewall of the limiting portion (33C) of the operating member (30C) and an inner sidewall of the holding portion (45C) and is not less than 0.05 millimeters.
- The drawing compass as claimed in claim 1, wherein
the limiting portion (33C) of the operating member (30C) further comprises an engagement structure (33C') formed on an external surface of the limiting portion (33C);
the limiting hole (42C') of the outer casing (40C) further comprises an inner peripheral surface matching the engagement structure (33C') of the operating member (30C) in shape; and
parts of the limiting portion (33C) of the operating member (30C) selectively engage with the limiting hole (42C') of the outer casing (40C). - The drawing compass as claimed in claim 8, wherein the engagement structure (33C') of the limiting portion (33C) is shaped like a triangle, a polygon, a tooth, or a groove.
- The drawing compass as claimed in claim 1, wherein
the outer casing (40, 40B, 40C, 40D) further comprises two half-shells (44, 44B, 44C, 44D) connected to each other;
each of the two half-shells (44C, 44D) of the outer casing (40C, 40D) further comprises a limiting section (443C, 443D) formed on a lower segment of the corresponding half-shell (44C, 44D); and
the two limiting sections (443C, 443D) of the two half-shells (44C, 44D) jointly define a limiting space therebetween for limiting an included angle defined between the two legs (20C, 20D) relative to the outer casing (40C, 40D). - The drawing compass as claimed in claim 1, wherein the two linking portions (12, 12A, 12D, 12E) of the moving device (10, 10A, 10B, 10C, 10D, 10E) are swingable toward or away from each other with respect to the imaginary longitudinal first axis (C1).
- The drawing compass as claimed in claim 11, wherein
each of the two linking portions (12, 12A, 12D, 12E) of the moving device (10, 10A, 10B, 10C, 10D, 10E) further comprises a swingable linking rod (14, 14B, 14C, 14C', 14D);
each said linking rod (14, 14B, 14C, 14C', 14D) further comprises a swing end located away from the operating member (30, 30B, 30C, 30D); and
a top of each of the two legs (20, 20B, 20C, 20D) is connected to the corresponding swing end of the linking rod (14, 14B, 14C, 14C', 14D) of the linking portion (12, 12A, 12D, 12E). - The drawing compass as claimed in claim 12, wherein
each of the linking rods (14C') of the moving device (10C) further comprises a first pivotal end (141C') and a second pivotal end (142C'), both of which are located away from each other; and
each of the two second pivotal ends (142C') comprises a slot (143C') such that the second pivotal ends (142C') are elastically deformable and pivotally connected with the tops of the two legs (20C), respectively. - The drawing compass as claimed in claim 11, wherein
the moving device (10A, 10E) is an elastic structure;
each of the two linking portions (12A) of the moving device (10A) further comprises a swing end located away from the operating member (30A); and
top ends of the two legs (20A) are rotatably connected to the swing ends of the two linking portions (12A), respectively. - The drawing compass as claimed in claim 1, wherein the drawing compass further comprises a cap (50B) selectively connected to a bottom of one or the other of the two legs (20B) or the operating end (32B) of the operating member (30B).
- The drawing compass as claimed in one of claims 1 to 15, wherein
a longitudinal imaginary second axis (C2) passes through the connecting end (31) of the operating member (30, 30A, 30B) and is parallel to the lengthwise operating member (30, 30A, 30B); and
an eccentric distance (E) is formed between the imaginary longitudinal first axis (C1) and the imaginary longitudinal second axis (C2). - The drawing compass as claimed in claim 16, wherein the connecting portion (11) deviates from the imaginary longitudinal first axis (C1) of the moving device (10, 10A, 10B) and is connected to the operating end (31) of the operating member (30, 30A, 30B), the imaginary longitudinal second axis (C2) passing through the connecting portion (11) and the limiting hole (42, 42A, 42B) of the outer casing (40, 40A, 40B).
- The drawing compass as claimed in claim 16, wherein
each of the two legs (20, 20B, 20C, 20D) further comprises a pivotal portion (21) and a coaxial portion (22) on a top thereof;
the pivotal portion (21) of each said leg (20, 20B, 20C, 20D) is located outside the corresponding leg (20, 20B, 20C, 20D) relative to the coaxial portion (22) and is pivotally connected to one of the two linking portions (12, 12D) of the moving device (10, 10B, 10C, 10D);
the coaxial portions (22) of the two legs (20, 20B, 20C, 20D) overlap and are connected to each other such that an imaginary first extending line (P1) that is orthogonal to the imaginary longitudinal first axis (C1) passes through a center of each said coaxial portion (22);
the pivotal portion (21) of one of the two legs (20, 20B, 20C, 20D) is located closer to the imaginary longitudinal second axis (C2) than the imaginary longitudinal first axis (C1) and said one leg (20, 20B, 20C, 20D) is defined as an eccentric side leg;
a linear distance (S) is defined between the pivotal portion (21) and the coaxial portion (22) of the eccentric side leg (20, 20B, 20C, 20D); and
the eccentric distance (E) is less than or equal to the linear distance (S). - The drawing compass as claimed in claim 17, wherein the two legs (20, 20A, 20B, 20C, 20D, 20E) are a pin leg and a pen leg, respectively, and the connecting end (31) of the operating member (30, 30A, 30B) is connected to the connecting portion (12, 12D) corresponding to the pen leg.
- The drawing compass as claimed in claim 1, wherein
each of the two legs (20, 20B, 20C, 20D) comprises a pivotal portion (21) and a coaxial portion (22), both of which are provided on a top of the leg (20, 20B, 20C, 20D);
each of the pivotal portions (21) of the two legs (20, 20B, 20C, 20D) is located outside the corresponding leg (20, 20B, 20C, 20D) with respect to the corresponding coaxial portion (22) and is pivotally connected to one of the two linking portions (12, 12D) of the moving device (10, 10A, 10B, 10C, 10D); and
the coaxial portions (22) of the two legs (20, 20B, 20C, 20D) overlap and are coaxially connected to each other.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW108139727 | 2019-11-01 | ||
TW109106418A TWI715452B (en) | 2019-11-01 | 2020-02-27 | Compass |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3815925A1 true EP3815925A1 (en) | 2021-05-05 |
Family
ID=73172455
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20204412.9A Withdrawn EP3815925A1 (en) | 2019-11-01 | 2020-10-28 | Drawing compass |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP3815925A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE818260C (en) * | 1949-11-11 | 1951-10-25 | Felix Sieracki | Compass with straight line and locking device |
JPS5620842B2 (en) | 1974-10-22 | 1981-05-15 | ||
CN102152694A (en) | 2010-04-14 | 2011-08-17 | 天津索尼克文具有限公司 | Compasses |
-
2020
- 2020-10-28 EP EP20204412.9A patent/EP3815925A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE818260C (en) * | 1949-11-11 | 1951-10-25 | Felix Sieracki | Compass with straight line and locking device |
JPS5620842B2 (en) | 1974-10-22 | 1981-05-15 | ||
CN102152694A (en) | 2010-04-14 | 2011-08-17 | 天津索尼克文具有限公司 | Compasses |
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