JP2002370203A - Circular saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a hand easy to put on a work when the work is to be cut within a circular saw. SOLUTION: In the circular saw wherein a ruler leg (19) is fitted into a groove (22) formed on a base (13) and a ruler main body (20) is attached to the ruler leg (19), the ruler main body (20) is, in a position-changeable manner, attached to the ruler leg (19). Since the ruler leg (19) does not project onto a motor case side, the work can be cut while the hand is put on the work as it is.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circular saw provided with a ruler.

[0002]

2. Description of the Related Art As shown in FIGS. 8 to 10, a circular saw sometimes has a ruler 2 on a base 1 thereof. The ruler 2 is composed of a ruler leg 3 and a ruler body 4, and has two ruler legs 3, 3
Are arranged on the base 1 so as to extend in the left-right direction of the circular saw, and a ruler main body 4 is connected to tips of two ruler legs 3, 3. In order to cut the work 5 with a circular saw using the ruler 2, as shown in FIG. 8, the base 1 is placed on the upper surface 5 a of the work 5, and the ruler body 4 is put on the side surface 5 b of the work 5. Then, the ruler body 4 is slid along the side surface 5b of the work 5. Thereby, the work 5 is cut parallel to the side surface 5b.

The circular saw rule disclosed in Japanese Patent Application Laid-Open No. 6-312402 has a clearance at the rear of its guide surface for performing a smooth cutting operation. Registered Utility Model No. 25
In the circular saw disclosed in the 77778 publication, a plurality of pairs of convex portions for positioning the ruler legs on the base are provided on the base in order to increase the parallelism between the guide surface of the ruler and the saw blade, and the ruler legs are provided between the convex portions. Is sandwiched between them.

[0004]

The conventional circular saw ruler is:
Since the ruler leg 3 and the ruler main body 4 are fixed and integrated by a set screw 6 or the like, when the distance between the ruler main body 4 and the base 1 is reduced, as shown in FIG. Project greatly toward the motor case 7. However,
On the motor case 7 side, the operator attaches his hand to the upper surface 5a of the work 5 during sawing, and when the ruler leg 3 advances with the circular saw, the hand must be moved away from the work 5 or shifted. The smoothness of the cutting operation is impaired.

The conventional ruler leg 3 is fitted into a groove 8 formed on the base 1 as shown in FIG. 10, but due to a manufacturing error of the groove 8 and the ruler leg 3, etc. 11 and 12, a gap A is formed between the groove 8 and the ruler leg 3, and the ruler 2 is easily rattled. When such a gap A occurs, as shown by a two-dot chain line in FIG. In addition, the registered utility model 2
The circular saw of No. 577798 needs to machine a convex portion when sandwiching a ruler leg, which is troublesome.

An object of the present invention is to solve such a problem.

[0007]

According to a first aspect of the present invention, a ruler leg (19) is fitted into a groove (22) formed on a base (13). In the circular saw having the ruler body (20) attached to the ruler (19), a circular saw in which the ruler body (20) is attached to the ruler leg (19) so as to be changeable in position is employed.

[0008] The invention according to claim 2 is based on the base (1).
3) In a circular saw having a ruler leg (19) fitted in the groove (22) formed thereon and a ruler body (20) attached to the ruler leg (19), the side wall of the groove (22) and the ruler leg ( 1
The circular saw in which the elastic body (34) is inserted between the side edge and the side edge of (9) is employed.

Further, the invention according to claim 3 is based on the base (1).
3) In a circular saw in which a ruler leg (19) is fitted into the groove (22) formed thereon and a ruler body (20) is attached to the ruler leg (19), a ruler leg (19) is provided on a side wall of the groove (22). 1
9) A circular saw having a slope (22b) for guiding the groove to the groove bottom (22a) is employed.

[0010]

Next, embodiments of the present invention will be described with reference to the drawings.

<First Embodiment> As shown in FIGS. 1 to 3, this circular saw includes a motor case 10 containing a motor (not shown), a saw blade 11 driven by the motor, and a motor case. 10, a fixed cover 12 that covers the upper part of the saw blade 11, a base 13 that is connected to a lower part of the fixed cover 12, and rotates out of the fixed cover 12 when the work 14 that is a work material is not processed. And a movable cover 15 that covers the lower portion of the saw blade 11 protruding below the base 13 and rotates into the fixed cover 12 to expose the lower portion of the saw blade 11 during processing of the work 14.

Although not shown, an electric motor (not shown) is placed in the motor case 10 in a horizontal direction, and a drive shaft 16 protrudes from a left end of the motor case 10, and a disc-shaped saw blade 11 is fixed to the left end of the drive shaft 16. Is done. A handle 17 for holding the circular saw by hand is fixed to the upper part of the motor case 10.

A fixed cover 1 is provided at the left end of the motor case 10.
2 is attached to the motor case 10. The fixed cover 12 always covers substantially the upper half of the saw blade 11 and has a groove that curves along the outer periphery of the saw blade 11.

The base 13 is a rectangular plate applied to the surface of the work 14, and is disposed directly below the motor case 10 and the fixed cover 12. A groove (not shown) extending in the front-rear direction of the circular saw is formed in the base 13, and the lower portion of the saw blade 11 passes through the groove below the base 13.

A ruler 18 for guiding the circular saw along the side of the work 14 is attached to the base 13. The ruler 18 includes a ruler leg 19 and a ruler body 20. Two ruler legs 19 are provided in parallel with each other, and the ends of both ruler legs 19 are connected by a connecting piece 21 extending in the front-rear direction of the circular saw. The number of the ruler legs 19 may be one, or three or more. Grooves 22 extending in the left-right direction of the circular saw are formed on the base 13 so as to correspond to the ruler legs 19, and the ruler legs 19 are fitted into the grooves 22. Also base 1
A support piece 24 for supporting a clamp screw 23 with a knob is formed on each of the grooves 3 so as to straddle each groove 22.
The screw 23 for clamping, which is screwed into the female screw hole of, and penetrates into the groove 22, presses each ruler leg 19 to the bottom of the groove 22. By loosening the clamp screw 23, the ruler leg 19
The upper part can be freely adjusted in its left-right direction. The ruler body 20 is stretched between a plurality of ruler legs 19, 19 so as to extend in the front-rear direction of the circular saw, and each ruler leg 19 passes through a lateral hole formed in the ruler body 20. The ruler body 20 is slidable on the ruler legs 19 in the left and right direction of the circular saw. Fixed in position. By changing the position of the ruler body 20 in this manner, the guide surface 20a of the ruler body 20 and the saw blade 1
The spacing from 1 is adjusted.

The base 13 is connected to a lower end of the fixed cover 12 through a cut depth adjusting device and an angle adjusting device.

The cutting depth adjusting device includes a base 1 of the saw blade 11.
3, a pin-shaped first support shaft 26 arranged parallel to the drive shaft 16 for connecting the base 13 to the fixed cover 12 at the front of the circular saw.
And a guide plate 27 that connects the base 13 to the fixed cover 12 at the rear of the circular saw. The first support shaft 26 is arranged at the upper end of a bracket 28 that stands upright from the front of the base 13. The guide plate 27 rises from the rear of the base 13 and enters the groove of the fixed cover 12. Information board 2
7 is curved along the groove inside the fixed cover 12 so as not to hit the saw blade 11 and the moving cover 15. A slit (not shown) is formed in the guide plate 27 in the length direction thereof, and a fixing screw (not shown) inserted from the inside of the fixing cover 12 penetrates the slit. It is screwed. By loosening the knob nut 29 and sliding the guide plate 27 along the fixed cover 12 and tightening the knob nut 29 again, the saw blade 11
The amount of protrusion from below the base 13 can be adjusted, and the cutting depth with respect to the work 14 can be adjusted.

The angle adjusting device adjusts the angle of the saw blade 11 with respect to the base 13 and is arranged in a direction perpendicular to the drive shaft 16 for connecting the bracket 28 and the guide plate 27 to the base 13. A second support shaft 30 and a tightening screw 31 with a knob for tightening the base 13 to the fixed cover 12 are provided. The fastening screw 31 passes through the long hole 32 a of the fixing plate 32 erected on the base 13 and is screwed into a female screw (not shown) formed on the bracket 28 side, thereby fixing the base 13 to the fixing cover 12. It is supposed to. The elongated hole 32a is curved around the second support shaft 30, and the tightening screw 31 is slid along the elongated hole 32a, and the tightening screw 31 is tightened again.
3 is fixed at a desired angle with respect to the fixed cover 12, and the saw blade 1 is fixed.
1 can be set at a desired angle with respect to the base 13.

The movable cover 15 covers substantially the lower half of the saw blade 11 and has a groove that curves along the outer periphery of the saw blade 11. The movable cover 15 is rotatably supported by a drive shaft 16 or a boss (not shown) formed on the fixed cover 12 so as to surround the drive shaft 16. When the workpiece 14 is not machined, the movable cover 15 is rotated out of the fixed cover 12 by an urging means (not shown) such as a spring as shown in FIGS. 1 and 2 to cover the lower half of the saw blade 11. When the workpiece 14 is processed, the saw blade 1 is rotated into the fixed cover 12 and
1 is exposed. In addition, moving cover 1
5 is provided with a lever-shaped knob 33, and the movable cover 15 is fixed to the fixed cover 12 by holding the knob 33.
It can also be retracted inside.

Next, the operation of the circular saw having the above configuration will be described.

By operating the cutting depth adjusting device and the angle adjusting device, the amount of protrusion of the saw blade 11 below the base 13 is adjusted, and the angle of the saw blade 11 with respect to the base 13 is adjusted.

Further, the ruler body 20 is moved on the ruler legs 19 in accordance with the processing dimensions of the work 14 and the like, and the distance between the guide surface 20a of the ruler body 20 and the saw blade 11 is adjusted. To move the ruler body 20, the tightening screw 25 is loosened, the ruler body 20 is slid on the ruler leg 19, and when the guide surface 20a reaches a desired position, the tightening screw 25 is tightened to move the ruler body 20 to the corresponding position. Fixed to. To adjust the position of the ruler body 20, loosen the clamp screw 23 and remove the ruler leg 1.
9 can be performed by sliding the base 9 on the base 13 in the left and right direction.
Can be performed by moving only the ruler main body 20 on the ruler leg 19 while keeping it fixed on the base 13.

In order to cut the work 14 with this circular saw, as shown in FIG.
After the guide surface 20a of the ruler body 20 is brought into contact with the side surface 14b of the work 14, the ruler body 20 is slid along the side surface 14b of the work 14 while supporting the circular saw with the handle 17 and moving forward. Thereby, the work 14 is cut in parallel to the side surface 14b.

In the cutting operation of the work 14, when the distance between the guide surface 20a of the ruler body 20 and the saw blade 11 is reduced to reduce the cutting width, the ruler legs are moved on the base with a conventional circular saw. 8 and FIG. 10, the ruler leg 3 protrudes toward the motor case 7, so that the operator must release his hand attached to the upper surface 5a of the work 5 during the cutting operation. However, according to the present invention, the ruler body 20 can be moved while the ruler leg 19 is fixed on the base 13 as shown in FIGS. In this case, there is no need to shift or remove the hand attached to the upper surface 14a of the work 14, and the cutting operation can be performed smoothly.

<Second Embodiment> As shown in FIGS. 4 and 5, the circular saw according to the second embodiment has a ruler 18 on the base 13 as in the case of the first embodiment. 1
9 is different from that of the first embodiment in the manner of attachment to the base 13. That is, the groove 22 formed on the base 13
The ruler leg 19 is fitted into the groove 22. A leaf spring 34, which is an elastic body, is inserted into a gap between the side wall of the groove 22 and the side edge of the ruler leg 19. The ruler leg 19 is pressed against the other side wall of the groove 22 by the leaf spring 34, and the base 1
3, the guide surface 20a of the ruler body 20 and the saw blade 1
The degree of parallelism with 1 is secured.

Rubber can be used instead of the leaf spring 34 as the elastic body. In addition, the elastic body may be provided at a plurality of positions for each ruler leg 19.

In the circular saw ruler according to the second embodiment, the ruler body 20 is fixed to the ruler foot 19 with a set screw 35. However, as in the first embodiment, the ruler body 20 is connected to the ruler foot. 19 may be slidably mounted.

<Third Embodiment> As shown in FIGS. 6 and 7, the circular saw according to the third embodiment has a ruler on the base 13 as in the first and second embodiments. Leg 1
9 is attached to the base 13 in a different manner from the first and second embodiments. That is, the ruler leg 19 is fitted into the groove 22 formed on the base 13, and a slope 22 b for guiding the ruler leg 19 to the groove bottom 22 a is formed on one side wall of the groove 22. 19 is pushed into the groove 22, the side edge of the ruler leg 19 becomes this slope 22b.
And the other side edge of the ruler leg 19 is pressed against the vertical surface 22 c of the other side wall of the groove 22. As a result, the ruler leg 19 is fixed in the groove 22 without rattling, and the parallelism between the guide surface 20a of the ruler body 20 and the saw blade 11 is maintained. The groove 22 is desirably formed such that the width of the groove bottom 22 a is slightly smaller than the width of the ruler leg 19. By doing so, the ruler leg 19 is always inserted parallel to the groove 22,
Consequently, the ruler body 20 is always fixed to the saw blade 11 in parallel.

[0029]

According to the first aspect of the present invention, in a circular saw having a ruler leg fitted into a groove formed on a base and a ruler body attached to the ruler leg, the ruler body is positioned with respect to the ruler leg. Since the ruler main body is moved with respect to the ruler leg, the distance between the saw blade and the ruler main body can be adjusted while the ruler leg is fixed to the base. Therefore, it is possible to minimize the amount of the ruler legs protruding to the side opposite to the saw blade of the base so as not to hinder the cutting operation.

According to the second aspect of the present invention, in a circular saw in which a ruler leg is fitted into a groove formed on a base and a ruler body is mounted on the ruler leg, the side wall of the groove and the side edge of the ruler leg have the same shape. Since the elastic body is inserted between them, the ruler legs can always be inserted into the groove in parallel, and the ruler body can be fixed parallel to the saw blade.

According to the third aspect of the present invention, in a circular saw in which a ruler leg is fitted into a groove formed on a base and a ruler body is attached to the ruler leg, the ruler leg is attached to a side wall of the groove to the groove bottom. Is formed, the ruler legs can always be inserted into the groove in parallel by the guiding action of the slope, and the ruler body can be fixed parallel to the saw blade. In addition, since it is not necessary to attach another component to the base, the structure can be simplified.

[Brief description of the drawings]

FIG. 1 is a front view of a circular saw according to the present invention.

FIG. 2 is a left side view of the circular saw shown in FIG. 1;

FIG. 3 is a plan view of the circular saw shown in FIG. 1;

FIG. 4 is a plan view of a circular saw according to another embodiment of the present invention.

FIG. 5 is an enlarged view of a main part of the circular saw shown in FIG.

FIG. 6 is an enlarged view of a main part of a circular saw according to another embodiment of the present invention.

7 is a sectional view taken along line VII-VII in FIG.

FIG. 8 is a front view of a conventional circular saw.

FIG. 9 is a left side view of the circular saw shown in FIG. 8;

FIG. 10 is a plan view of the circular saw shown in FIG. 8;

FIG. 11 is a partially cutaway plan view of the base of the circular saw shown in FIG. 8;

FIG. 12 is a sectional view taken along line XII-XII in FIG. 11;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 13 ... Base 19 ... Ruler leg 20 ... Ruler main body 22 ... Groove 22a ... Groove bottom 22b ... Slope 34 ... Elastic body

Claims (3)

[Claims] 1. A circular saw in which a ruler leg is fitted into a groove formed on a base and a ruler body is mounted on the ruler leg, wherein the ruler body is mounted on the ruler leg so that its position can be changed. Circular saw. 2. A circular saw having a ruler leg fitted into a groove formed on a base and a ruler body attached to the ruler leg, wherein an elastic body is inserted between a side wall of the groove and a side edge of the ruler leg. A circular saw characterized by the following. 3. A circular saw having a ruler leg fitted into a groove formed on a base and a ruler body attached to the ruler leg, a slope formed on a side wall of the groove to guide the ruler leg to the groove bottom. A circular saw characterized by the following: