EP0388611A2 - Fastening and adjusting device, particularly for draughtsman compasses - Google Patents
Fastening and adjusting device, particularly for draughtsman compasses Download PDFInfo
- Publication number
- EP0388611A2 EP0388611A2 EP90102156A EP90102156A EP0388611A2 EP 0388611 A2 EP0388611 A2 EP 0388611A2 EP 90102156 A EP90102156 A EP 90102156A EP 90102156 A EP90102156 A EP 90102156A EP 0388611 A2 EP0388611 A2 EP 0388611A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- shaped element
- rods
- fastening
- compasses
- cavity
- 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.)
- Granted
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Images
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
- B43L9/16—Features common to compasses, dividers, and callipers
- B43L9/24—Means for mounting points or writing appliances on legs
Definitions
- the present invention relates to fastening and adjusting device, particularly for draughtsman compasses.
- the draughtsman compasses of the known art are generally constituted by two hinged rods each having a point at its lower end; usually one of the two points can be substituted by a lead holder or a drawing pen, according to the case.
- one of the two rods is shorter and a fastening member is hinged at its lower end for the lead holder or drawing pen element.
- the fastening member is substantially constituted by a pair of jaws that can be tightened by a screw and by a knurled ring; furthermore, the fastening member is hinged with some friction in order to keep the selected angle during its use.
- the fastening member has to be pivoted to the rod in order to vary its angle with respect to the rod because otherwise, when the compass aperture increases, the lead holder or the drawing pen would work at an excessive angle to operate correctly.
- the locking of the lead holder or of the drawing pen can be improved, mainly regarding the speed of execution.
- Main aim of the present invention is that of providing a fastening device for the lead holder or the drawing pen in a compass, having a rapid and easy operation and furthermore with an improved aperture with respect to the known ones.
- an object of the invention is that of providing a device easily manufactured from a productive point of view and hence economically competitive.
- a fastening and adjusting device particularly for draughtsman compasses comprising a pair of upwardly hinged rods, characterized in that it comprises a U-shaped element hinged at the lower end of at least one of said rods, said lower end having a substantially curved surface, said U-shaped element defining a cavity between its legs and said surface, a support member being inserted in said cavity and locked against said surface by means of an adjustable abutment member, said support member being adapted to support a lead holder,a drawing pen, a point or similar.
- a compass 1 comprises two rods 2 and 3, upwardly hinged to a block 4 having a hand grip 5, in a per se known manner.
- a U-shaped element 6 has two legs 7 hinged to the lower end of each of the rods 2, 3 in order to define a cavity 15 between its legs 7 and the surface 10 of the rod end.
- a threading 8 is provided on the element 6, partially covering also the legs 7, for a locking ring 9.
- a support element can be inserted in the cavity 15 for such elements as a lead holder, a drawing pen a point or similar.
- a support element 14 for a point, applied to the lower end of rod 3, is schematically illustrated by dashed lines.
- a support element 11 advantageously constituted by a single body comprising a drawing pen 12 juxtaposed to a lead holder 13.
- the operation of the device is the following: as the desired aperture of the compass is set, the rings 9 are loosened to allow the U-shaped elements to rotate and to set them at the most suitable angle with respect to the working surface.
- the abutment surface 10 of the lower ends of the rods 2 and 3 is a curved surface for easing the continuous locking of the support elements.
- An advantage of the invention is that of allowing to incline and lock the end organs by the one easy operation of tightening a ring.
- a further advantage of the device according to the invention is that of always ensuring a safe locking that depends on the tightening strength of the ring, which is adjustable at will and therefore does not suffer after some time from the wearing out of hinges or similar, as in the known compasses.
- the device according to the invention may have numerous modifications and variations, all within the inventive concept; furthermore, all the details may be substituted with technically equivalent elements.
- the materials employed, as well as the dimensions, may be any according to the specific needs and the state of the art.
Landscapes
- Drawers Of Furniture (AREA)
- Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
- Eye Examination Apparatus (AREA)
- Pivots And Pivotal Connections (AREA)
Abstract
Description
- The present invention relates to fastening and adjusting device, particularly for draughtsman compasses.
- The draughtsman compasses of the known art are generally constituted by two hinged rods each having a point at its lower end; usually one of the two points can be substituted by a lead holder or a drawing pen, according to the case.
- Usually, in these types of compasses one of the two rods is shorter and a fastening member is hinged at its lower end for the lead holder or drawing pen element.
- The fastening member is substantially constituted by a pair of jaws that can be tightened by a screw and by a knurled ring; furthermore, the fastening member is hinged with some friction in order to keep the selected angle during its use.
- The fastening member has to be pivoted to the rod in order to vary its angle with respect to the rod because otherwise, when the compass aperture increases, the lead holder or the drawing pen would work at an excessive angle to operate correctly.
- This very common type of mechanism has a rather satisfactory operation but it is susceptible to improvements.
- In the known compasses in fact, the pivoting point of the fastening member is rather high, therefore the working aperture of the compass is greatly reduced relatively to the length of the fixed point rod.
- Moreover, the rotation of the fastening member is not easy because of the friction, thus rendering difficult those jobs where it is required a particularly precise aperture adjusting.
- Also the locking of the lead holder or of the drawing pen can be improved, mainly regarding the speed of execution.
- Main aim of the present invention is that of providing a fastening device for the lead holder or the drawing pen in a compass, having a rapid and easy operation and furthermore with an improved aperture with respect to the known ones.
- Within this aim, an object of the invention is that of providing a device easily manufactured from a productive point of view and hence economically competitive.
- This aim as well as these and other objects which will be more apparent later, are achieved by a fastening and adjusting device, particularly for draughtsman compasses comprising a pair of upwardly hinged rods, characterized in that it comprises a U-shaped element hinged at the lower end of at least one of said rods, said lower end having a substantially curved surface, said U-shaped element defining a cavity between its legs and said surface, a support member being inserted in said cavity and locked against said surface by means of an adjustable abutment member, said support member being adapted to support a lead holder,a drawing pen, a point or similar.
- Further characteristics and advantages of the invention will be more apparent by the following description of an embodiment of the invention, illustrated,by way of example, in the enclosed drawings wherein:
- Figure 1 is an elevated side view of the compass according to the invention;
- Figure 2 is a view similar to the preceding one but wherein the compass is more open;
- Figure 3 is an isometric enlarged view of the locking device.
- With reference to the cited figures, a compass 1, according to the invention, comprises two
rods block 4 having ahand grip 5, in a per se known manner. - A
U-shaped element 6 has twolegs 7 hinged to the lower end of each of therods cavity 15 between itslegs 7 and thesurface 10 of the rod end. - A threading 8 is provided on the
element 6, partially covering also thelegs 7, for alocking ring 9. - A support element can be inserted in the
cavity 15 for such elements as a lead holder, a drawing pen a point or similar. - In the figures, a
support element 14 for a point, applied to the lower end ofrod 3, is schematically illustrated by dashed lines. - At the lower end of the
other rod 2 is instead applied asupport element 11, advantageously constituted by a single body comprising adrawing pen 12 juxtaposed to alead holder 13. - The operation of the device is the following: as the desired aperture of the compass is set, the
rings 9 are loosened to allow the U-shaped elements to rotate and to set them at the most suitable angle with respect to the working surface. - At this point it is sufficient to again tighten the
rings 9 to lock the U-shaped elements at the selected angle, and at the same time, to lock the support elements of the point and of the lead holder and drawing pen. - The
abutment surface 10 of the lower ends of therods - If it is desired to use the drawing pen instead of the lead holder, it will suffice to loosen the
ring 9, in order to extract thesupport 11, and to again insert it into thecavity 15 from its opposite end. - It has been practically observed how the invention achieves the intended aim and objects by providing a device that allows the points' and lead holder's or drawing pen's inclination to be adapted to the various apertures, through a rapid and easy operation and also increasing the maximum working aperture of the compass.
- An advantage of the invention is that of allowing to incline and lock the end organs by the one easy operation of tightening a ring.
- A further advantage of the device according to the invention is that of always ensuring a safe locking that depends on the tightening strength of the ring, which is adjustable at will and therefore does not suffer after some time from the wearing out of hinges or similar, as in the known compasses.
- The device according to the invention may have numerous modifications and variations, all within the inventive concept; furthermore, all the details may be substituted with technically equivalent elements.
- The materials employed, as well as the dimensions, may be any according to the specific needs and the state of the art.
- Where technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly, such reference signs do not have any limiting effect on the scope of each element identified by way of example by such reference signs.
Claims (4)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT8919814A IT1228670B (en) | 1989-03-20 | 1989-03-20 | LOCKING AND ADJUSTMENT DEVICE, PARTICULARLY FOR DRAWER COMPASSES. |
IT1981489 | 1989-03-20 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0388611A2 true EP0388611A2 (en) | 1990-09-26 |
EP0388611A3 EP0388611A3 (en) | 1990-11-22 |
EP0388611B1 EP0388611B1 (en) | 1993-06-23 |
Family
ID=11161503
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90102156A Expired - Lifetime EP0388611B1 (en) | 1989-03-20 | 1990-02-03 | Fastening and adjusting device, particularly for draughtsman compasses |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0388611B1 (en) |
DE (1) | DE69002023T2 (en) |
ES (1) | ES2041452T3 (en) |
IT (1) | IT1228670B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2319495B1 (en) * | 2008-12-24 | 2009-12-29 | Pablo Fernando Serfati | COMPASS FOR MULTICOLORED DRAWING. |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB145216A (en) * | 1919-05-13 | 1920-07-02 | Accles & Pollock Ltd | Improvements in or relating to compasses, calipers and the like |
GB228026A (en) * | 1924-03-20 | 1925-01-29 | William Joseph Harris | Improvements in and relating to drawing compasses |
GB868316A (en) * | 1958-04-29 | 1961-05-17 | Helix Universal Co Ltd | Improvements relating to drawing compasses |
FR1294839A (en) * | 1961-04-19 | 1962-06-01 | Ball compass | |
GB1279195A (en) * | 1970-03-03 | 1972-06-28 | W J Harris Birmingham Ltd | Improvements in or relating to drawing and dividing compasses |
FR2590206A1 (en) * | 1985-11-19 | 1987-05-22 | Petit Jean Christophe | Improved pair of compasses |
-
1989
- 1989-03-20 IT IT8919814A patent/IT1228670B/en active
-
1990
- 1990-02-03 DE DE90102156T patent/DE69002023T2/en not_active Expired - Fee Related
- 1990-02-03 ES ES199090102156T patent/ES2041452T3/en not_active Expired - Lifetime
- 1990-02-03 EP EP90102156A patent/EP0388611B1/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB145216A (en) * | 1919-05-13 | 1920-07-02 | Accles & Pollock Ltd | Improvements in or relating to compasses, calipers and the like |
GB228026A (en) * | 1924-03-20 | 1925-01-29 | William Joseph Harris | Improvements in and relating to drawing compasses |
GB868316A (en) * | 1958-04-29 | 1961-05-17 | Helix Universal Co Ltd | Improvements relating to drawing compasses |
FR1294839A (en) * | 1961-04-19 | 1962-06-01 | Ball compass | |
GB1279195A (en) * | 1970-03-03 | 1972-06-28 | W J Harris Birmingham Ltd | Improvements in or relating to drawing and dividing compasses |
FR2590206A1 (en) * | 1985-11-19 | 1987-05-22 | Petit Jean Christophe | Improved pair of compasses |
Also Published As
Publication number | Publication date |
---|---|
ES2041452T3 (en) | 1993-11-16 |
IT8919814A0 (en) | 1989-03-20 |
DE69002023D1 (en) | 1993-07-29 |
DE69002023T2 (en) | 1994-02-17 |
IT1228670B (en) | 1991-07-03 |
EP0388611A3 (en) | 1990-11-22 |
EP0388611B1 (en) | 1993-06-23 |
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