CN107803554B

CN107803554B - Cutting circular saw

Info

Publication number: CN107803554B
Application number: CN201610810912.4A
Authority: CN
Inventors: 吉绍山; 陈国军; 齐献山
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2016-09-08
Filing date: 2016-09-08
Publication date: 2020-08-14
Anticipated expiration: 2036-09-08
Also published as: CN107803554A

Abstract

The invention particularly relates to a circular cutting saw, which comprises a casing, a power driving device, a transmission mechanism and an output shaft, wherein a saw blade is arranged on the output shaft, and a protective cover covering the saw blade is also arranged on the casing; install on the casing can be on a parallel with the output shaft to the outside direction stretch out, surpass the roll adjustment device of one section distance of guard shield lateral surface and location, when the material that needs the cutting to be close to the wall, measure earlier and treat the distance between line of cut and the wall, this distance is appointed distance promptly, stretch out the roll adjustment device in parallel with the output shaft to the outside, surpass the appointed distance of guard shield lateral surface, then make the lateral surface of roll adjustment device hug closely the wall and promote the annular saw forward and cut, just can accurately cut out the material of needs. The marking line does not need to be drawn in advance, and whether the sawteeth are aligned with the marking line or not is observed through human eyes, and meanwhile, the technical requirement on operators is also reduced.

Description

Cutting circular saw

Technical Field

The invention relates to an electric tool, in particular to a circular cutting saw capable of adjusting a cutting position to a required position.

Background

Circular saws generally include a housing having an electric motor, a drive mechanism and an output shaft with a saw blade mounted thereon, with a guard shield being added to the saw blade.

In daily work, users often need to take off a small part of a whole workpiece for further processing, and traditionally, a mark line is drawn on the workpiece to display the cutting position, and then the workpiece is cut along the mark line. However, when cutting, the shield blocks a part of the line of sight and the hand operation is likely to shake, so that the actual cutting line is likely to deviate from the marking line, and the machining accuracy is low.

Disclosure of Invention

Based on this, there is a need for a circular cutting saw capable of adjusting a cutting position to a desired position with high cutting accuracy.

The circular cutting saw comprises a shell, wherein an output shaft and a power driving device for driving the output shaft to rotate are arranged in the shell, a saw blade is arranged on the output shaft, and a protective cover covering the saw blade is also arranged on the shell; the method is characterized in that: the cutting circular saw is provided with a distance adjusting device which can extend out in a direction parallel to the outer side of the output shaft and the outer side face of the shield and is positioned.

When the material that needs the cutting to be close to the wall, measure earlier and wait to cut the distance between position and the wall, this distance is appointed distance promptly, stretches out distance adjusting device in parallel with output shaft outside, surpasss the appointed distance of guard shield lateral surface, then makes distance adjusting device's lateral surface hug closely the wall and promote the annular saw forward and cut, just can accurately cut out the material that needs. The marking line does not need to be drawn in advance, and whether the sawteeth are aligned with the marking line or not is observed through human eyes, and meanwhile, the technical requirement on operators is also reduced.

In one embodiment, the distance adjusting device is a rotating wheel arranged on a cutting circular saw, and the rotating shaft of the rotating wheel is perpendicular to the output shaft; the runner includes a plurality of planes that distribute along the circumferencial direction, the polylith plane respectively can be along the runner rotation with the guard shield surface parallel to, and when the polylith plane was parallel with the guard shield surface, the distance that is apart from the guard shield surface was different.

In one embodiment, the cutting circular saw comprises a positioning structure capable of positioning the distance adjusting device, and a pin hole parallel to the output shaft is arranged on the shell of the machine shell; the pin hole is divided into an outer section hole, a middle section hole and an inner section hole; the positioning structure is a limiting block arranged on the inner surface of the outer section hole; the distance adjusting device comprises a pin shaft positioned in a pin hole, and the pin shaft is divided into an outer section shaft, a middle section shaft and an inner section shaft; a limited piece is fixed on the outer surface of the outer side section shaft; the limited part can move along with the pin shaft in the outer side direction and rotate to be positioned at the outer side of the limited part, and is limited by the limited part and cannot move in the inner side direction.

In one embodiment, the aperture of the middle section hole is smaller than the aperture of the outer section hole and the aperture of the inner section hole respectively; the outer surface of the inner side section shaft is also fixedly provided with a limited part, the limited part on the inner side section shaft is limited in the inner side section hole by the middle section hole, and the limited part on the outer side section shaft is limited in the outer side section hole by the middle section hole.

In one embodiment, a plurality of sets of limiting blocks are respectively arranged on the inner surface of the outer section hole at intervals along the axial direction of the pin shaft.

In one embodiment, the shell of the casing is provided with 3 pin holes which are not on the same straight line, and the distance adjusting device comprises 3 pin shafts which are respectively positioned in the 3 pin holes.

In one embodiment, the pin is sleeved with an elastic device which is limited between the inner side surface of the middle section hole and the limited part of the inner side section shaft, and the elastic device can provide an inward acting force for the pin after the pin moves in the outward direction.

In one embodiment, the cutting circular saw has a display device capable of displaying a set of limiting blocks when the limited member on the outer stage shaft is positioned by the set of limiting blocks.

In one embodiment, the display device is a plurality of labels which are arranged on the outer side surface of the pin hole, distributed along the circumferential direction and respectively corresponding to the plurality of groups of limit blocks, and an indication arrow arranged on the outer side surface of the pin shaft; when the limited member on the outer stage shaft is positioned by a certain set of limiting blocks, the indication arrow can point to the mark corresponding to the set of limiting blocks.

In one embodiment, the distance adjusting device further comprises a linkage structure which can drive the other two pins to move synchronously when one of the pins moves.

Drawings

FIG. 1 is a schematic front view of a circular cutting saw according to embodiment 1 of the present invention;

FIG. 2 is a partial cross-sectional view of FIG. 1;

FIG. 3 is an exploded view of a cutting circular saw according to embodiment 1 of the present invention;

FIG. 4 is a partial cross-sectional view of FIG. 1 in the pinless condition;

FIG. 5 is a perspective view of a circular saw for cutting according to embodiment 2 of the present invention;

fig. 6 is a partial sectional view of the rotor in the original position in embodiment 2 of the present invention;

FIG. 7 is a partial cross-sectional view of a flat surface of the rotor extending outside the outer side of the shroud in example 2 of the present invention.

The relevant elements in the figures are numbered correspondingly as follows:

100. cutting circular saw 110, casing 120, output shaft

130. Saw blade 140, shield 150, base

160. Pin hole 162, lateral section hole 164, and middle section hole

166. Inner section hole 168, limiting block 1681 and label

170. Pin 172, limited part 174, and indication arrow

180. Spring 190, rotating wheel 192 and rotating shaft

194. Plane surface

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

Herein, the direction of the saw blade 130 toward the guard 140 is an outer direction, the direction of the saw blade away from the guard 140 is an inner direction, the direction of the saw blade moving forward during cutting is a front direction, and the direction of the saw blade moving away from the guard is a rear direction.

Example 1

The circular cutting saw of the present invention includes a housing 110, a motor installed in a rear case of the housing 110, a transmission mechanism installed in a front case, and an output shaft 120, a saw blade 130 installed on the output shaft 120, and a guard 140 covering the saw blade 130 installed on the housing 110 in order to eliminate a safety hazard. The bottom of the front portion of the housing 110 has a base 150, and the base 150 is provided with a through hole for the saw blade 130 to pass through, so that when cutting, an operator operates the circular saw to expose the saw blade 130 downwards from the through hole of the base, and the motor drives the output shaft 120 to rotate through the transmission mechanism to drive the saw blade 130 to rotate for cutting.

The casing 110 is provided with a distance adjusting device which can extend to the outside direction of the casing parallel to the output shaft 120 and exceed the outer side surface of the shield 140, and the distance adjusting device can also be arranged on a gear box or a shield. The cutting circular saw includes a positioning structure capable of positioning the pitch adjustment device. The outer side of the distance adjustment device forms a plane perpendicular to the output shaft 120. When cutting, the distance adjusting device is parallel to the distance required by the output shaft extending outwards and exceeding the outer side surface of the protective cover 140, then the outer side surface of the distance adjusting device is tightly attached to the wall surface and the circular saw is pushed forwards for cutting, and therefore required materials can be cut accurately.

As shown in fig. 1: the shell of the casing 110 is provided with 3 pin holes 160 which are not on the same straight line and are parallel to the output shaft 120; a pin hole 160 parallel to the output shaft 120 may be respectively disposed at the top of the casing 110 and the front end and the rear end of the base 150, and a connecting line of distribution points of the 3 pin holes 160 forms an isosceles triangle.

As shown in fig. 2: each pin hole 160 is divided into an outboard section hole 162, a middle section hole 164, and an inboard section hole 166; the locating structure may be a stop 168 disposed on the inner surface of the outer section bore 162; the pitch adjustment device comprises 3 pins 170 located in 3 pin holes 160, respectively. The pin shaft 170 is divided into an outer section shaft, a middle section shaft and an inner section shaft; a limited part 172 is fixed on the outer surface of the outer section shaft; the stopper 172 is rotatably positioned outside the stopper 168 along with the movement of the pin 160 in the outward direction, and is stopped by the stopper 168 so as not to move in the inward direction. The limited part can be a bulge or a shaft retainer ring. The outer side surface of each pin shaft 170 forms a plane perpendicular to the output shaft 120, and the area of the outer side surface of each pin shaft 170 is small, so that the 3 pin shafts 170 are arranged, the circular saw can be conveniently cut when a material close to a wall surface is cut, the circular saw can be stably pushed forwards along the wall surface, and the cutting precision is guaranteed.

The distance adjusting device also comprises a linkage structure which can drive the other two pin shafts to synchronously move when one of the pin shafts moves.

The bore diameter of the middle section hole 164 is smaller than the bore diameters of the outer section hole 162 and the inner section hole 166 respectively; the diameter of the middle section hole 164 can be matched with the diameter of the pin shaft 170, so that when the pin shaft 170 moves towards the outer side or the inner side in the whole pin hole 160, the pin shaft 170 does not shake in the circumferential direction, the moving stability of the pin shaft 170 is improved, and the action reliability of the distance adjusting device is improved.

As shown in fig. 3: the limited member 172 is also fixed to the outer surface of the inner-stage shaft, the limited member 172 on the inner-stage shaft is limited in the inner-stage hole 166 by the middle-stage hole 164, and the limited member 172 on the outer-stage shaft is limited in the outer-stage hole 162 by the middle-stage hole 164. The pin 170 is sleeved with an elastic device which is limited between the inner side surface of the middle section hole and the limited part of the inner side section shaft, and the elastic device can be a spring 180 or other elastic devices. The middle section bore 164 has a smaller bore diameter than the diameter of the spring 180 and does not allow passage of the spring 180. The elastic device has the following functions: when the limited part 172 on the outer side section shaft moves outwards and rotates and is located outside a certain group of limiting blocks 168, the elastic device can be compressed to apply a backward acting force to the pin shaft 170, so that the limited part 172 on the outer side section shaft is tightly attached to the outer side surface of the group of limiting blocks 168, namely, the elastic device is matched with the limiting blocks 168 to fix the position of the pin shaft 170 after extending outwards.

A plurality of sets of limiting blocks 168 are respectively arranged on the inner surface of the outer section hole 162 at intervals along the axial direction of the pin shaft. The circular cutting saw has a display device capable of displaying the set of stopper blocks when the to-be-stopped member on the outer stage shaft is positioned by a certain set of stopper blocks 168. The display device can be a plurality of labels which are arranged on the outer side surface of the pin hole, distributed along the circumferential direction and respectively corresponding to the plurality of groups of limit blocks and an indicating arrow 174 arranged on the outer side surface of the pin shaft; when the limited member on the outer stage shaft is positioned by a certain set of limiting blocks, the indication arrow 174 can point to the reference numeral corresponding to the set of limiting blocks.

As shown in fig. 4, each set of the limiting blocks 168 may be a limiting block, and at this time, the plurality of sets of limiting blocks are arranged in the circumferential direction, and the distance from the outer side surface of the shield gradually decreases, so that the plurality of sets of limiting blocks form a structure similar to a spiral step. The restrained pieces 172 on the outer side section shaft of the pin 170 may be two protrusions symmetrical in the circumferential direction. The limited parts 172 on the inner side section shaft of the pin shaft may also be two protrusions symmetrically arranged along the circumferential direction, or one or more protrusions, or even a step structure or a retaining ring for the shaft, as long as the spring 180 can be limited.

When the cutting distance needs to be adjusted, the distance between the position to be cut and the wall surface is measured firstly, then the pin shaft 170 is pulled and rotated towards the outer side direction, the indication arrow 174 points to the corresponding label, the outer side surface of the pin shaft 170 is tightly attached to the wall surface, and then the circular saw is pushed forward to cut.

The stoppers 168 may be 5 groups, or may be divided into more groups as needed. The outer side surface of the pin hole 160 is marked with 5 groups of limiting blocks along the circumferential direction, 5 numbers are respectively corresponding to the limiting blocks, the numbers can be set to 5 numbers of 8, 10, 13, 16 and 19, and the number of the numbers can be the same as the number of the distance to be moved. The limited parts 172 on the outer side section shafts of the pin shafts 170 are limited on the limited parts 168 in different groups, and the extending lengths of the front end surfaces of the pin shafts 170 are different. For example, when the pin 170 is retained by the second set of stops 168, the pointer arrow 174 points to the second label 10.

The outer side surface of the pin 170 is aligned with the outer side surface of the shield 140, the pin 170 is pulled and rotated in the outward direction, so that the limited part 172 on the outer side section of the pin 170 is limited at the outer side of the limited part 168 corresponding to the label 8, the pin 170 moves a distance in the outward direction in the process, at this time, the limited part 172 on the inner side section of the pin 170 moves a distance in the outward direction, the spring 180 is compressed, an inward acting force is provided for the pin 170, and therefore the limited part 172 on the outer side section of the pin 170 is tightly attached to the limited part 168 of the first group. The pin 170 is continuously pulled and rotated in the outward direction, so that the limited part 172 on the outer side section of the pin 170 is limited at the outer side of the limited part 168 corresponding to the reference numeral 10, and the spring 180 is continuously compressed as the pin 170 continuously moves in the outward direction for a certain distance. The pin 170 is continuously pulled and rotated in the outward direction, so that the limited part 172 on the outer side section of the pin 170 is limited at the outer side of the limited part 168 corresponding to the label 13, and the spring 180 is continuously compressed. By analogy, the outward extension distance of the outer side surface of the pin shaft 170 is larger and larger.

By rotating the pin 170 in the opposite direction, the pin 170 will automatically move in the inward direction under the force of the spring. After use, the pin 170 is rotated in the opposite direction until the outer side of the pin 170 is flush with the outer side of the shroud 140.

Example 2

As shown in fig. 5, a circular cutting saw includes a housing 110, an output shaft and a power driving device for driving the output shaft to rotate are disposed in the housing, a saw blade 130 is mounted on the output shaft, and a protective cover 140 covering the saw blade is further disposed on the housing; the bottom of the front portion of the housing 110 has a base 150, and the base 150 is provided with a through hole for the saw blade 130 to pass through, so that when cutting, an operator operates the circular saw to expose the saw blade 130 downwards from the through hole of the base, and the motor drives the output shaft to rotate through the transmission mechanism to drive the saw blade 130 to rotate for cutting.

The cutting circular saw is provided with a distance adjusting device which can extend out in a direction parallel to the outer side of the output shaft and exceeds the outer side surface of the shield and is positioned. The distance adjusting device is a rotating wheel 190 arranged on a cutting circular saw, and a rotating shaft 192 of the rotating wheel is vertical to an output shaft; the runner includes a plurality of planes 194 distributed along the circumferential direction, the planes 194 are respectively capable of being parallel to the outer surface of the shield as the runner rotates, and when the planes are parallel to the outer surface of the shield, the distances from the outer surface of the shield are different.

When the distance adjusting device needs to be adjusted to a specified distance, the rotating wheel 190 is rotated to enable the corresponding plane 194 to be parallel to the outer surface of the shield, and the adjustment is convenient.

As shown in fig. 6 and 7, the end surface of the wheel 190 may be a square configuration with the axis of rotation 192 mounted at a non-central location on the wheel such that the distance from the outer surface of the shield varies when the respective planes 192 are parallel to the outer surface of the shield as the wheel 190 rotates about the axis of rotation 192.

The end surface of the runner can also be in a hexagonal structure or a regular polygon with other shapes, and the end surface of the runner can also be in an irregular polygon.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A circular cutting saw comprises a casing, wherein an output shaft and a power driving device for driving the output shaft to rotate are arranged in the casing, a saw blade is arranged on the output shaft, and a protective cover covering the saw blade is further arranged on the casing; the method is characterized in that: be provided with on the cutting circular saw and stretch out, surpass the roll adjustment device of guard shield lateral surface and location in the direction of output shaft casing outside, the roll adjustment device has the plane of location usefulness, the roll adjustment device is runner or round pin axle, when the roll adjustment device surpassed the guard shield lateral surface, the plane is dorsad the saw bit.

2. The cutting circular saw of claim 1, wherein: the distance adjusting device is a rotating wheel arranged on the cutting circular saw, and a rotating shaft of the rotating wheel is vertical to the output shaft; the runner includes a plurality of planes that distribute along the circumferencial direction, the polylith plane respectively can be along the runner rotation with the guard shield surface parallel to, and when the polylith plane was parallel with the guard shield surface, the distance that is apart from the guard shield surface was different.

3. The cutting circular saw of claim 1, wherein: the cutting circular saw comprises a positioning structure capable of positioning the distance adjusting device, and a pin hole parallel to the output shaft is formed in the shell of the machine shell; the pin hole is divided into an outer section hole, a middle section hole and an inner section hole; the positioning structure is a limiting block arranged on the inner surface of the outer section hole; the distance adjusting device comprises a pin shaft positioned in a pin hole, and the pin shaft is divided into an outer section shaft, a middle section shaft and an inner section shaft; a limited piece is fixed on the outer surface of the outer side section shaft; the limited part can move along with the pin shaft in the outer side direction and rotate to be positioned at the outer side of the limited part, and is limited by the limited part and cannot move in the inner side direction.

4. The cutting circular saw of claim 3, wherein: the aperture of the middle section hole is respectively smaller than the apertures of the outer side section hole and the inner side section hole; the outer surface of the inner side section shaft is also fixedly provided with a limited part, the limited part on the inner side section shaft is limited in the inner side section hole by the middle section hole, and the limited part on the outer side section shaft is limited in the outer side section hole by the middle section hole.

5. The cutting circular saw of claim 3, wherein: and a plurality of groups of limiting blocks are respectively arranged on the inner surface of the outer section hole at intervals along the axial direction of the pin shaft.

6. The cutting circular saw of claim 3, wherein: the casing of casing is provided with 3 not in the pinhole on same straight line, the roll adjustment device includes 3 round pin axles that are located 3 pinholes respectively.

7. The cutting circular saw of claim 4, wherein: the hinge pin is sleeved with an elastic device limited between the inner side surface of the middle section hole and the limited part of the inner side section shaft, and the elastic device can provide an acting force in the inner side direction for the hinge pin after the hinge pin moves in the outer side direction.

8. The cutting circular saw of claim 5, wherein: the circular cutting saw has a display device capable of displaying a set of limiting blocks when the limited block on the outer section shaft is positioned by the set of limiting blocks.

9. The cutting circular saw of claim 8, wherein: the display device is a plurality of labels which are arranged on the outer side surface of the pin hole, distributed along the circumferential direction and respectively corresponding to the plurality of groups of limit blocks and an indicating arrow arranged on the outer side surface of the pin shaft; when the limited member on the outer stage shaft is positioned by a certain set of limiting blocks, the indication arrow can point to the mark corresponding to the set of limiting blocks.

10. The cutting circular saw of claim 6, wherein: the distance adjusting device also comprises a linkage structure which can drive the other two pin shafts to synchronously move when one of the pin shafts moves.