JP2002361601A - Rotary tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To alleviate an impact when a tool of a circular saw is tilted. SOLUTION: In a rotary tool equipped with a housing (8) for storing a motor which rotatively drives the tool (7); a tool cover (10) to which the housing (8) is relatively freely pivotally connected via a fulcrum pin (9); a base (12) connected to the tool cover (10) via pivot shafts (11a and 11b) and a clamping means (18); and a stopper (13) for controlling an angle of the tool (7) to the base (12), a buffer means (19) is provided between the housing (8) or the tool cover (10) and the base (12).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a rotary tool such as a circular saw.

[0002]

2. Description of the Related Art A circular saw, which is a rotary tool disclosed in Japanese Patent Application Laid-Open No. Hei 8-290401, includes a housing in which an electric motor for driving and rotating a blade is housed, and a base which is connected below the housing via a pivot and a fastening means. And a stopper for restricting the angle of the base with respect to the housing. When the blade is inclined, the housing is inclined in a direction away from the base from an upright state on the base, and a stopper attached to the housing is applied to the base when the housing is returned to the upright state. As a result, a perpendicularity between the blade and the base is obtained.

A circular saw disclosed in Japanese Patent Application No. 2000-239584 has a housing 2 containing an electric motor for rotating and driving a blade 1 as shown in FIG. And a base 5 connected below the housing 2 via a pivot 3 and a fastening means 4; and a stopper 6 for regulating the angle of the base 5 with respect to the housing 2, which is disclosed in Japanese Patent Application Laid-Open No. 8-290401. Unlike the saw, the blade 1 is inclined with respect to the base 5 by inclining the housing 2 from the upright state toward the base 5, and the stopper 6 attached to the housing 2 is applied to the base 5. Thus, the blade 1 is held at a desired inclination angle with respect to the base 5.

[0004]

However, in a conventional rotary tool such as a circular saw, when the housing is inclined on the base and the stopper is applied to the base, an impact force acts on the housing and the base, and distortion occurs on these. Likely to happen. If the housing or the base is distorted and deformed, the blade cannot be tilted by a desired angle, and the desired processing cannot be achieved.

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

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 comprises a housing (8) accommodating an electric motor for rotationally driving a blade (7), and the housing (8) being a fulcrum pin ( A blade cover (10) connected to the blade cover (10) so as to be relatively rotatable via a shaft (11a, 11b) and a fastening means (18); In a rotary tool provided with a stopper (13) for regulating the angle of the blade (7) with respect to the base (12), a buffer means (10) is provided between the housing (8) or the blade cover (10) and the base (12). The rotary tool provided with 19) is adopted.

According to a second aspect of the present invention, in the rotary tool according to the first aspect, the stopper (13) is an adjusting screw, and the buffer means (19) is a compression coil spring mounted on the adjusting screw. Is adopted.

[0008]

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

As shown in FIGS. 1 to 3, the circular saw, which is a rotary tool, has a housing 8 in which an electric motor for driving and rotating a blade 7 is housed, and the housing 8 can be relatively rotated via a fulcrum pin 9. The blade cover 10 includes a blade cover 10 to be connected, a base 12 connected to the blade cover 10 via pivots 11 a and 11 b and fastening means, and a stopper 13 for regulating an angle of the blade 7 with respect to the base 12.

Although not shown, an electric motor is horizontally disposed in the housing 8 in the left and right direction, and a drive shaft thereof protrudes from the left end of the housing 8, and a blade 7 is fixed to the left end of the drive shaft as shown in FIG. Is done. A handle 14 for holding the circular saw by hand is fixed to an upper portion of the housing 8.

At the left end of the housing 8, a blade cover 10 for covering the blade 7 is provided. The housing is connected to the blade cover 10 via a fulcrum pin 9 extending parallel to the drive shaft as shown in FIG.
When the fulcrum pin 9 is pivoted up and down with respect to the fulcrum 0 with respect to the fulcrum 0, the blade 7 protrudes and retracts from an opening formed at the lower end of the blade cover 10. A lock device 15 is provided between the housing 8 and the blade cover 10 so that the housing 8 can be fixed to the blade cover 10 while the blade 7 is housed in the blade cover 10. Further, when the lock device 15 is unlocked and the housing 8 is lowered with respect to the blade cover 10, a stopper 16 which determines the maximum descent amount of the housing 8 and regulates the maximum protrusion amount of the blade 7 can be changed on the blade cover 10. Installed. The fulcrum pin 9 is provided with a torsion coil spring 17 for constantly urging the housing 8 upward with respect to the blade cover 10 and retracting the blade 7 into the blade cover 10.

The base 12 is a rectangular plate, and is disposed directly below the housing 8 and the blade cover 10, as shown in FIGS. As shown in FIGS. 1 and 3, the left end of the base 12 is connected to the lower end of the blade cover 10 via two pivots 11a and 11b extending in the front-rear direction of the circular saw.
As shown in FIG. 2, the blade 7 can be inclined with respect to the base 12 by rotating the blade cover 10 and the housing 8 around the pivots 11 a and 11 b so as to approach on the base 12.

[0013] Between the blade cover 10 and the base 12,
Tightening means for adjusting the angle between the pivots 11a and 11b as a fulcrum and setting the blade 7 at a desired angle is provided. As shown in FIGS. 1 and 3, the fastening means includes a bracket 12 formed so as to overlap each front end of the base 12 and the blade cover 10.
a, 10a, an arc-shaped long hole (not shown) formed around the pivot 11b formed in the bracket 12a on the base 12 side, and a female screw formed on the bracket 10a on the blade cover 10 side. And a tightening screw 18 with a knob 18a. Blade cover 10 and housing 8
Can be set at a desired angle with respect to the base 12, and the blade 7 can be set at the angle with respect to the base 12 by tightening the tightening screw 18.

As shown in FIGS. 1 to 3, between the housing 8 or the blade cover 10 and the base 12, a stopper 13 for setting the angle of the blade 7 with respect to the base 12 to a predetermined size is provided. And a buffer means for reducing the impact when the stopper 13 acts.

The stopper 13 is, specifically, a blade cover 10.
Adjustment screw attached to the bracket 10a.
The adjusting screw is screwed into the bracket 10 a, and the tip of the adjusting screw faces the upper surface 12 b of the base 12. By rotating the blade cover 10 and the housing 8 around the pivots 11a and 11b,
When the tip of the adjusting screw is placed on the base 12, the blade 7 is inclined at a certain angle with respect to the base 12, and the angle relation is fixed by tightening with the tightening screw 18 there. The angular relationship of the blade 7 with respect to the base 12 can be finely adjusted by screwing an adjusting screw serving as the stopper 13 back and forth on the bracket 10a. The adjusting screw can be attached to the housing 8 or the base 12 other than the blade cover 10.

The cushioning means is, specifically, a compression coil spring 19 which is an elastic body.
It is mounted between the two. When the tightening screw is loosened, the housing 8 and the blade cover 10 move from the position shown in FIG. 1 to the position shown in FIG.
Of the adjusting screw as the stopper 13 attempts to collide with the base 12, but the compression coil spring 19 absorbs the impact at the time of the collision. This allows
The adjusting screw serving as the stopper 13 abuts quietly on the base 12 and stops.

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

When a work (not shown) is cut perpendicularly to its surface, as shown in FIG.
The blade cover 10 and the housing 8 are fixed to the base 12 with tightening screws 18 so as to be perpendicular to the base. After that, the lock device 15 is unlocked, the blade 7 is rotated, and the circular saw is mounted so that the base 12 contacts the work.
When the circular saw is pushed in one direction with the handle 14, the work is cut perpendicular to the base 12.

When the work is to be cut obliquely on its surface, the fastening screw 18 is loosened and the blade cover 1 is cut as shown in FIG.
0 and the housing 8 are inclined with respect to the base 12.
When the tightening screw 18 is loosened due to this inclination, the housing 8 and the blade cover 10 rotate around the pivots 11a and 11b from the position shown in FIG. 1 to the position shown in FIG. The distal end of the adjusting screw 13 attempts to collide with the upper surface 12b of the base 12, but the compression coil spring 19 absorbs and reduces the impact force at the time of the collision. As a result, the adjusting screw comes into contact with the base 12 silently, thereby preventing the blade cover 10 and the base 12 from being deformed. Thereafter, the blade cover 10 and the housing 8 are fixed to the base 12 with the tightening screws 18, the locking device 15 is unlocked, the blade 7 is rotated, and the work is cut.
Specifically, for example, the following cutting operation is performed. That is, the circular saw is placed so that the base 12 is in contact with the floor of the building, the left end of the base 12 is applied to the wall rising from the floor, and the circular saw is pushed in one direction along the wall with the handle 14. I do. Thereby, the floor surface is cut so as to follow the wall surface.

In the circular saw of this embodiment, the blade is inclined with respect to the base by inclining the housing in a direction approaching the base from the standing state, and the blade is desired with respect to the base by applying a stopper to the base. However, the present invention provides a stopper for tilting the housing in a direction away from the base from an upright state on the base when tilting the blade, and returning the housing to the upright state when returning the housing to the upright state. The present invention can also be applied to a circular saw in which a right angle between the blade and the base is obtained by contacting the base with the base.

[0021]

According to the first aspect of the present invention, a housing accommodating a motor for driving the blade to rotate, a blade cover to which the housing is relatively rotatably connected via a fulcrum pin, and a pivot shaft attached to the blade cover. And a rotating tool having a base connected via a fastening means and a stopper for regulating the angle of the blade with respect to the base, wherein the buffer means is provided between the housing or the blade cover and the base, so that the blade inclination At this time, since the stopper does not collide violently with the base or the blade cover, it is possible to prevent the angular accuracy from being deviated due to abrasion or deformation of the contact portion, and to reduce mechanical stress on the base and the like.

According to the second aspect of the present invention, the stopper is an adjusting screw, and the buffering means is a compression coil spring mounted on the adjusting screw. The mechanical stress caused by deforming the compression coil spring, which is the body, can be reduced. Further, since the compression coil spring is disposed coaxially with the adjusting screw for adjusting the angle, the spring can be prevented from coming off or displacing with a simple structure.

[Brief description of the drawings]

FIG. 1 is a front view of a rotary tool according to the present invention, showing a state where a housing is upright.

FIG. 2 is a front view of the rotary tool according to the present invention, showing a state where a housing is inclined.

FIG. 3 is a right side view of the rotary tool shown in FIG. 1;

FIG. 4 is a view similar to FIG. 3 of a conventional rotary tool.

[Explanation of symbols]

 7: Blade 8: Housing 9: Support pin 10: Blade cover 11a, 11b: Axis 12: Base 13: Stopper 18: Tightening screw 19: Compression coil spring

Claims (2)

[Claims] 1. A housing accommodating an electric motor for rotationally driving a blade, a blade cover to which the housing is rotatably connected via a fulcrum pin, and a base connected to the blade cover via a pivot and a fastening means. And a stopper for restricting the angle of the blade with respect to the base, wherein a buffering means is provided between the housing or the blade cover and the base. 2. The rotary tool according to claim 1, wherein said stopper is an adjusting screw, and said buffer means is a compression coil spring mounted on said adjusting screw.