JPH09192977A - Cover for rotary working part of tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cover for a rotary working part of a tool, which can change its fixing angle, which is stable in a fixed condition once it is fixed, and which is prevented from swinging. SOLUTION: A cover for a rotary working part of a tool, is composed of a cover body part 2 for covering the rotary working part of the tool, and a band-like tool gripping part 3 having opposite ends 4, 5 which are coupled together through the intermediary of a fastening means 6 having a toggle structure. The diameter of the tool gripping part 3 is reduced by the fastening means 6 so as to fasten and fix the tool body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover for a rotary processing part of a tool having a rotary processing part such as a hand-type concrete cutter and a disk grinder.

[0002]

2. Description of the Related Art Conventionally, a tool having a rotary working portion is provided with a cover for the rotary working portion in order to prevent the defective portion when the rotary working portion is damaged during use and scattering of dust generated during processing. It is attached. The cover for the rotary processing part is an obstacle depending on the position of the object to be processed, so that it is necessary to change the fixing angle frequently.

In a conventional rotary machining portion cover, a band-shaped tool gripping portion is provided in a cover main body portion which partially covers the rotary machining portion of a tool, and projecting pieces are formed at both ends of the tool gripping portion.
A bolt is inserted through these protruding pieces, and the tool gripping portion is reduced in diameter by the bolt so that it can be tightened and fixed to the tool body.

Therefore, in order to change the fixing angle of the conventional rotary machining section cover, it is necessary to rotate the bolt with a spanner each time to expand and contract the tool gripping section, which is troublesome.

In particular, in the case of cutting concrete while pouring water on it, such as a hand-type concrete cutter, the concrete may adhere to the threaded portion of the bolt and harden, making it impossible to rotate the bolt. It was

Further, even if the conventional rotary working portion cover is once fixed to the tool, the bolt may loosen due to vibration during use of the tool, and the fixing state may become unstable, causing swaying. It was

[0007]

SUMMARY OF THE INVENTION Therefore, the present invention
An object of the present invention is to provide a cover for a rotary processing part of a tool, in which the fixing angle can be easily changed, and the fixing state is stable once fixed and does not rock.

[0008]

In order to solve the above-mentioned problems, the present invention employs the following technical means.

The cover for the rotary processing part of the tool of the present invention comprises:
A band-shaped tool gripping portion 3 is provided on a cover main body portion 2 that partially covers the rotary processing portion 1 of the tool, and both ends 4 and 5 of the tool gripping portion 3 are connected via a fastening means 6 having a toggle structure, The fastening means 6 reduces the diameter of the tool grip 3 so that it can be fastened and fixed to the tool body 7.

The fastening means 6 comprises a lever 9 pivotally attached to one end 4 of the tool gripper 3, a hook 13 provided on the other end 5, and a connecting ring 11 for connecting the lever 9 and the hook 13. By rotating the lever 9, the diameter of the tool grip 3 can be reduced.

Further, a mark 8 may be provided on the surface of the cover main body 2 to indicate the position of the rotary processing unit 1.

As a result of employing the above means, the present invention has the following operation. Since the tool rotating portion cover of the present invention is configured such that the diameter of the tool holding portion 3 is reduced by the fastening means 6 having a toggle structure, the tool holding portion 3 can be easily expanded / contracted. Moreover, since no bolts are used for the fastening means 6, not only does the bolt loosen due to the vibration of the tool and the fixing state becomes unstable, but also the fastening means using the bolts causes a problem due to the adhesion of concrete. Since there is no protruding portion, it is not difficult to expand or contract the tool grip 3.

The fastening means 6 has one end 4 of the tool gripping portion 3.
Lever 9 pivotally attached to, hook 13 provided at the other end 5,
And a connecting ring 11 for connecting the lever 9 and the hook 13, and by rotating the lever 9, the tool grip 3 can be reduced in diameter. The grip portion 3 can be expanded and contracted.

Further, if a mark 8 is provided on the surface of the cover main body 2 to indicate the position of the rotary working unit 1, the mark 8 serves as a guide for the rotary working unit 1 to serve as a guide for the rotary working unit 1. Machining work can be performed appropriately while confirming the position.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

The cover for the rotary processing part of the tool of the present invention comprises:
A band-shaped tool gripping portion 3 is provided on a cover main body portion 2 that partially covers the rotary processing portion 1 of the tool, and both ends 4 and 5 of the tool gripping portion 3 are connected via a fastening means 6 having a toggle structure, The fastening means 6 reduces the diameter of the tool grip 3 so that it can be fastened and fixed to the tool body 7.

The rotary machining section cover of this tool is fixed to the tool main body 7 of a tool such as a hand-type concrete cutter or a disc grinder, and as shown in FIG. The cover main body 2 has a substantially semi-circular shape that accommodates about half of the main body 2, and a substantially circular band-shaped tool gripping portion 3 provided at the center side end of the cover main body 2.

The center side end of the cover main body 2 is arranged along the peripheral surface of the tool main body 7 having a circular cross section. The cover main body 2 has a side wall at the outer end, and a mark 8 for indicating the position of the rotary processing section 1 is attached to the surface of the side wall.

About half of the total length of the tool grip 3 is provided along the center side end of the upper surface of the cover main body 2, one end 4 is fixed to the upper surface of the cover main body 2, and the other end 5 is provided. Is located outside the cover body 2.

At one end 4 of the tool gripping portion 3 is formed a receiving portion projecting outward, and a shaft mounting portion 10 of the lever 9 is provided therein. The lever 9 is generally along the tool grip 3,
The tip is bent to the opposite side so that it can be easily operated by hand.

The lever 9 is formed in such a length that it fits just within the upper surface of the cover main body 2 and can be easily operated with a little force, and it does not get out of the cover main body 2 when being fixed and interfere with the work. ing.

A connecting ring 11 is rotatably attached to the lever 9. The connecting ring 11 is formed by forming a wire made of spring steel into a substantially rectangular frame shape and is curved in a direction along the tool grip portion 3.
The position a little apart from is the mounting portion 12.

At the other end 5 of the tool gripper 3, a connecting ring is attached.
A hook 13 for hooking 11 is provided. This hook 13
Is formed by narrowing the width of the tool gripper 3 and bending it outward in a U-shape. The connecting ring 11 may be kept rotatably connected to the other end 5 of the tool gripper 3 at all times.

The fastening means 6 in this embodiment
As described above, the lever 9, the connecting ring 11, the hook
It consists of thirteen.

In order to fix the rotary working portion cover of this tool to the tool, first, the tool gripping portion 3 is wound around the tool main body 7, and the cover main body portion 2 is covered on the rotary working portion 1.

Then, the connecting ring 11 is hooked on the hook 13 to connect the lever 9 and the hook 13, and the lever 9 is rotated clockwise in the drawing. Then, the distance between the both ends 4 and 5 of the tool gripping portion 3 is narrowed, the diameter of the tool gripping portion 3 is reduced, and the rotary processing portion cover of this tool is tightened and fixed to the tool body 7.

FIG. 2 is a view showing a state in which the rotary processing section cover is fixed to the tool body 7. When the lever 9 is rotated in the counterclockwise direction contrary to the case where the lever 9 is fixed, the distance between the both ends 4 and 5 of the tool grip 3 is increased, the tool grip 3 is expanded in diameter, and is not fixed to the tool body 7. .

Since the cover for the rotary processing portion does not use bolts, the tool gripping portion 3 can be easily expanded / contracted by simply rotating the lever as described above, and the fixing angle can be easily changed frequently. . Moreover, the bolt does not loosen due to the vibration of the tool and the fixed state does not become unstable, and there is no place like the threaded part of the bolt that easily becomes unrotatable even if concrete adheres. It is difficult to change.

Further, the mark 8 serves as a guide for machining by the rotary machining unit 1, and the machining work can be appropriately performed while confirming the position of the rotary machining unit 1.

FIG. 3 is a view showing a state in which the rotary processing portion cover is fixed, with tools omitted. Before fixing, the attachment part 12 of the connecting ring 11 is hooked with the shaft attachment part 10 of the lever 9.
It is located on the opposite side (right side in the figure) of the tool gripper 3 with respect to the line A connecting the line 13, but when fixed, it passes through this line A,
It is located on the tool gripper 3 side (left side in the drawing).

When the connecting ring 11 is hooked on the hook 13 and the lever 9 is rotated clockwise in the drawing, a force is applied to pull the hook 13 toward the end 4 side, but the original state is returned to this force. An attempted repulsive force is generated in the tool grip 3.

Further, the connecting ring 11 receives a force to extend it from its original curved state.
11 also has a repulsive force to return to the original curved state against this force. Since the connecting ring 11 is made of spring steel as described above, the repulsive force is very strong.

Therefore, before the mounting portion 12 passes through the line A, the repulsive forces act against the clockwise rotation of the lever 9 to separate the lever 9 from the tool gripping portion 3. However, when the mounting portion 12 passes through the line A and is located on the tool gripping portion 3 side, the repulsive forces pull the mounting portion 12 toward the other end 5 side and the lever 9 rotates clockwise. It acts to promote rotation and prevent counterclockwise rotation. Therefore, the lever 9 is kept pressed against the tool grip 3.

The force with which the tool gripping portion 3 tightens the tool main body 7 becomes maximum when the mounting portion 12 of the lever 9 is located on the line A, and exceeds the line A.
Gets weaker as you get closer to. However, even when the lever 9 is in contact with the tool gripper 3, the connecting ring 11 is in a state of being stretched from the original curved state, so that the tool gripper 3 is
The force that tightens the tool body 7 constantly works on. Therefore, the fixed state of the cover for the rotary processing section is further stabilized.

As described above, since no bolt is used for the fastening means 6, the bolt is not loosened by the vibration of the tool and the fixed state does not become unstable. Therefore, the once-fixed cover for the rotary processing part of the tool of the present invention is stable in the fixed state and does not rock.

[0036]

The rotary machining portion cover for a tool according to the present invention has the above-described structure, and since the tool gripping portion 3 can be easily expanded and contracted without using a spanner, the fixed angle can be easily adjusted. Can be changed. Moreover, unlike the fastening means using bolts, it is not difficult to expand or contract the tool gripper 3 due to the adhesion of concrete, so there is no problem in changing the fixing angle. Further, the fastening means 6 having a toggle structure
Since the tool gripping portion 3 has a reduced diameter and does not loosen, it does not shake once fixed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a rotary processing unit cover of a tool according to the present invention.

FIG. 2 is a side view of the rotary processing part cover of the tool according to the present invention when it is fixed to the tool.

FIG. 3 is a plan view of a cover for a rotary processing portion of a tool according to the present invention.

[Explanation of symbols]

 1 rotation processing part 2 cover body part 3 tool gripping part 4 one end 5 the other end 6 fastening means 7 tool body 8 mark 9 lever 11 connecting ring 13 hook

Claims (3)

[Claims] 1. A band-shaped tool gripping part (3) is provided on a cover main body part (2) which partially covers a rotary processing part (1) of a tool, and both ends (4) () of the tool gripping part (3) are provided. 5) are connected via a fastening means (6) having a toggle structure, and the fastening means (6) reduces the diameter of the tool gripping part (3) so that it can be fastened and fixed to the tool body (7). A cover for the rotary processing part of the featured tool. 2. The fastening means (6) comprises a lever (9) pivotally attached to one end (4) of the tool gripping part (3), a hook (13) provided on the other end (5), and a lever (9). 9) and hook (1
3) Consists of a connecting ring (11) for connecting with, and lever (9)
The cover for a rotary processing part of a tool according to claim 1, wherein the tool gripping part (3) can be reduced in diameter by rotating. 3. The surface (1) of the cover body (2) is provided with a mark (8) for indicating the position of the rotary processing part (1).
Alternatively, the cover for the rotary processing part of the tool according to item 2.