JPH09300302A - Prevention of shaking of automatic hand saw and safety device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure a shaking-free operation, if a saw blade is thin and its driven at a high speed and give the effective function as a safety device by providing a bar with a U-shape cross section formed in such a manner that an upward rotation alone is enabled and also a small guide with a guide groove for guiding the spine part of the saw blade to prevent the saw blade from shaking crosswise, internally installed in the bar. SOLUTION: A shake stopper 1 has a U-shape cross section formed of a metal or a plastic material and also a base which is engaged with an angular guide 6 protruding from the tip of a main body 5 on both sides from above without a clearance and further, is hinged 4 to the main body 5. In addition, inside the shake stopper 1, a small guide with a groove in the center serving as a guide groove for the saw blade 9 is fixed, for stopping the shaking action, at a part near the base and at a position to the tip and a little inwardly from a position when the saw blade is retracted to the maximum allowable extent. Consequently, when cutting a material with this saw, the saw blade 9 is guided to the tip of the small guide, causing no shaking phenomenon. Besides, the shake stopper 1 is rotated into an arrow 13 direction as the saw blade 9 finds its way into the material, and no longer stands in the cutting action.

Description

Detailed Description of the Invention

[0001]

[Industrial application] Automatic tools

[0002]

2. Description of the Related Art Conventionally, a saw blade is made thick to prevent it from swinging.

[0003]

The thinner the saw blade is, the sharper the blade is, but the thinner the blade is, the more the saw blade swings. In addition, since the saw blades of both automatic hand saws and chain saws were exposed in the past, this was a dangerous method.

[0004]

[Means for Solving the Problems] In order to prevent lateral runout, a swing-stop main body which fits into a guide such as a square at the tip of the main body without a gap is rotatably attached only upward, and saw teeth are provided at several positions of this steady stop. Attach a small guide to guide you. In addition, this steady rest is used as a safety device. Also, when using for a chain saw, a guide such as a square is provided at the entrance and exit of the blade of the chain saw,
Attach the steady rest with the small guide removed to it as described above.

[0005]

EXAMPLE As shown in (1) of (FIG. 1), this steady rest is made of a metal or a plastic material having a U-shaped cross section, and its base (11) is the tip of the main body (5). It is fitted into the rectangular guide (6) projecting from the top so that there is no gap on both sides from the top. The guide (6) may be round or the like as long as both sides are parallel. Also, inside the steady rest (1), a small steady rest guide (2) is fixed near the tip near the base (11) and slightly inside the position when the saw blade is retracted to the maximum. It This small guide has a groove (3) in the center
There is a guide groove for the saw blade. Further, the hinge (4) may be used for the connection with the main body (5), or the upper portions on both sides and the guide (6) may be connected by the shaft (12).

Further, this steady rest (1) becomes a safety device as shown in FIG. 5 by making the length longer than when the saw is maximally projected and expanding both sides to make it slightly wider than the saw blade. The same is true for chainsaws. If the side surface of the steady rest is made of transparent plastic, it is easy to confirm the position of the saw blade.

[0007]

In the present invention, since the connection with the main body (5) does not swing to the left and right and can rotate only upward, it can be opened in the direction of the arrow (13). Therefore, when the material is cut by using this saw, the saw blade is guided to the tip by the small guide so that the runout does not occur, and as the saw blade penetrates the material, the steady rest moves upward in the arrow direction (13).
It does not get in the way of cutting by turning it to, and when cutting is completed, immediately returns from above to cover the entire saw blade.

[0008]

As described above, the present invention is effective as a safety device because it does not shake even if the saw blade is made thin, does not shake even if the driving speed is fast, and covers the entire saw blade.
Moreover, the thing which removed the small guide of this invention is very effective also as a safety device of a chain saw.

When this safety device is used for a chain saw, the one without the small guide (2) is used. Further, in the case of a chain saw, even if it does not cover the entire blade, if the half of the rotating portion of the saw blade is covered, the danger is reduced considerably. or,
When it is attached to a chain saw, the guide (6) is attached to the entrance and exit of the chain, and the safety device is attached thereto.

[Brief description of drawings]

FIG. 1 is a perspective view in which the whole of the present invention and a part thereof are cut open.

FIG. 2 is a perspective view of an automatic hand saw.

FIG. 3 is a perspective view of the present invention attached to an automatic hand saw.

FIG. 4 is a perspective view showing an attached state of the present invention.

FIG. 5 is a perspective view of the present invention used as a safety device.

[Explanation of symbols]

 1 Steady stop body 2 Small guide 3 Small guide groove 4 Hinge 5 Automatic hand saw body 6 Automatic hand saw body guide 7 Handle 8 Motor 9 Saw blade 10 Part that enters the saw blade body 11 Base of steady body 12 Shaft that may be used instead of hinge 13 Arrow that indicates the direction of rotation of steady rest body

Claims (2)

[Claims] 1. In an automatic hand saw that horizontally reciprocates by a small motor or an electric motor, the left and right protrusions at the tip of the automatic saw body serve as a steady rest of the saw blade, as shown in FIG. It is a bar with a U-shaped cross-section that has a dimension such that its base fits into a guide such as a round or square shape having a surface parallel to A steady rest, characterized in that a small guide made of plastic or the like having a guide groove for guiding the back portion of the saw blade for stopping lateral shake at one place or at two or more places is installed inside. 2. A safety device for an automatic hand saw and a chain saw, wherein the length of the steady rest is slightly longer than that when the saw is maximally projected, and both sides are slightly wider than the width of the saw.