JP3054898U - Safety device for operating lever in power tools - Google Patents

Abstract

(57) [PROBLEMS] To provide a safety device for an operation lever of a power tool, which is provided with a lock mechanism for preventing an unexpected operation of the operation lever. SOLUTION: In a tool which is operated by pressing and rotating an operation lever 3 pivotally attached to a handle portion of a tool body 1 backward, the operation lever 3 is provided.
The stop lever 5 is pivotally mounted on the upper side of the
The stop lever 5 is constantly pressed downward by a spring 7 so that the lower peripheral surface of the central portion of the horizontal shaft body 6 provided integrally with the distal end thereof is engaged with the upper end engaging surface 4 of the operation lever 3. , The lock state is maintained, the stop lever 5 is pushed upward with a fingertip to release the lock, and then the operation lever 3 is rotated.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a safety device for preventing an unexpected rotation of an operation lever in a power tool configured to be operated by a rotation operation of an operation lever pivotally attached to a handle portion. It is.

[0002]

[Prior art]

 Conventionally, for example, in a tool that performs various operations using compressed air as a power, an operation lever is pivotally attached to a handle portion of the main body, and a fingertip of a hand holding the handle portion is hooked on the operation lever. By rotating the operating lever, the valve body provided in the main body is opened, compressed air is supplied to the air motor through the compressed air introduction path, the air motor is rotated, and the rotational force is used to polish the air. It is configured to perform work and bolting work.

[0003]

[Problems to be solved by the invention]

 However, with the structure described above, the fingertip naturally catches the operation lever when gripping the handle, and it is ready to perform the work.Therefore, even when the work is not performed, the operation lever is unexpectedly pushed down to activate the tool. In some cases, there is a problem in terms of safety, and the operation lever may be operated unexpectedly in places where it is not necessary to perform work even during work. There was also a problem.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a safety device for an operation lever in a power tool in which the operation lever is unlikely to be operated unexpectedly.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, a safety device for an operating lever of a power tool according to the present invention is configured such that a finger is hooked on an operating lever rotatably pivoted on a handle of a tool body, and the operating lever resists a spring force. In a power tool that is operated by rotating it backwards, a stop lever constantly pressed downward by a spring different from the above-mentioned spring is pivotably mounted on the vicinity of the upper part of the operation lever so as to be vertically rotatable. In addition, a horizontally long shaft is integrally provided at the end of the stop lever, and a locking surface for locking the lower peripheral surface at the center of the shaft is formed on the upper end surface of the operation lever.

[0006] As a power tool provided with the safety device for an operation lever as described above, as described in claim 2, a compressed air introduction passage opened and closed by the operation lever is provided in a tool body. At the same time, the air motor is rotated by the compressed air introduced from the compressed air introduction passage, and the rotation of the air motor drives a working member such as a polishing member mounted on the front end of the tool body.

[0007]

[Action]

 When not in use, the shaft provided at the end of the stop lever is locked by a spring force on the locking surface formed on the upper end surface of the operation lever, and therefore, the operation lever cannot rotate. That is, the locked state is maintained. In use, when the stop lever is pushed upward against the spring force by the fingertip, the shaft is released from the locking surface of the operation lever and the lock is released, and in this state, the operation lever is rotated. To activate the tool.

At this time, since the side end of the shaft provided at the tip of the stop lever projects outward from the locking surface of the operation lever, a fingertip is hooked on the projected end and pushed upward. As a result, the stop lever shaft can be easily disengaged from the locking surface of the operation lever, and when the operation lever is rotated, the upper end surface of the operation lever slides on the lower surface of the stop lever to stop the stop lever. Maintain the lifted state, that is, the state where the lock is released.

When the operation is performed in this state, and when the pressing force on the operation lever is released when the operation is interrupted or completed, the operation lever is rotated forward by the spring force and the operation of the tool is stopped, and at the same time, the stop lever is stopped. The shaft body moves down along the upper end surface of the operation lever and locks on the locking surface of the operation lever, so that a locked state where rotation of the operation lever is disabled is obtained.

[0010]

[Embodiment of the invention]

 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings, in which a tool whose power is compressed air is described with reference to the drawings. An air motor (not shown) is provided in the head 1b in a known manner, and the rotation of the air motor drives the rotating member 2 rotatably supported at the front end of the head 1b. Thereby, a predetermined work such as a polishing operation is performed by rotating a work member (not shown) such as a polishing member detachably attached to the rotating member 2.

Reference numeral 3 denotes an operating lever having a lower end rotatably pivoted by a shaft 11 in a recess 10 provided at an upper portion on the front side of the handle portion 1a. The front end face is formed to protrude to form a finger-holding surface 3a, and an inclined surface 3b having a constant width is formed by slanting downward from the upper end of the finger-holding surface 3a toward the rear and having a constant width. The middle part of the projection is gently recessed downward to form a locking surface 4, and furthermore, a projection 3c protruding rearward is provided integrally on the rear end face. The upper end surface of the valve shaft 9a of the valve body 9 that opens and closes the compressed air introduction passage 8 is brought into contact with the stopper shaft 12, and the stopper shaft 12 is fixed in the recess 10 above the protrusion 3c. The operation lever 3 is prevented from rotating forward more than necessary.

A stop lever 5 is pivotally mounted on the upper end of the recess 10 near the upper part of the operation lever 3 so as to be vertically rotatable by a shaft 13. A shaft body 6 having a circular section that is long in the horizontal direction is integrally fixed. Further, the spring 7 is wound around the shaft 13 and one end of the spring 7 is engaged with the upper end surface of the recess 10 and the other end thereof is engaged with the upper end surface of the stop lever 5, respectively. The lever 5 is constantly pressed downward so that the lower peripheral surface of the central portion of the distal end shaft 6 is detachably engaged with the engaging surface of the operating lever 3, and the operating lever 3 cannot be operated in a normal state. The lock lever is held in a locked state, and both end portions 6a of the end shaft 6 of the stop lever 5 project outward from the upper end surface of the operation lever 3, as shown in FIG.

As a known means for opening and closing the compressed air introduction passage 8 provided in the handle portion 1a by the operation lever 3, compressed air is supplied to the compressed air introduction passage 8 at the lower end surface of the handle portion 1a. In addition, a hose connection fitting 14 is attached to the compressed air introduction passage 8, and a valve chamber 15 is provided in an intermediate portion of the compressed air introduction passage 8, and the valve body 9 is mounted inside the valve chamber 15 so as to be able to move up and down. The valve body 9 is pressed against the valve seat 17 by the coil spring 16 inserted into the lower part of the compressed air introduction passage 8, and the supply of compressed air to the compressed air introduction passage 8a from the valve chamber 15 to the upper air motor is cut off. ing. Further, a valve shaft 9a is disposed on the upper side of the valve body 9 so as to be vertically movable so that the lower end surface of the valve shaft 9a abuts on the upper surface of the valve body 9 and the upper end surface is formed by the projection of the operating lever 3. It is made to contact the lower end surface of 3c.

The operation of the safety device for the operating lever in the power tool constructed as described above will be described. When not in use, the valve body 9 is pushed upward by the coil spring 16 to be in close contact with the valve seat 17, and the compressed air introduction passage 8 is formed. And the stop lever 5 locks the distal end shaft 6 to the upper end locking surface 4 of the operation lever 3 by the spring 7. In this state, the operating lever 3 is prevented from rotating forward by bringing its projection 3c into contact with the stopper shaft 12 and the upper end surface of the operating lever 3 is directed forward from the locking surface 4. Is formed on the inclined surface 3b which is gently inclined upward, so that the front peripheral surface of the tip shaft 6 of the stop lever 5 is engaged with the inclined surface 3b, and the operation lever 3 is unexpectedly turned backward. It has been prevented from moving. Therefore, even if a rearward pressing force acts on the front finger-holding surface 3a of the operation lever 3, the operation lever 3 does not rotate, and the locked state is maintained.

Next, when performing work using the power tool, the fingertip of the index finger is projected outward from the locking surface 4 of the operation lever 3 while holding the handle 1 a of the tool body 1. The stop lever 5 is turned upward against the force of the spring 7 by hooking the lower peripheral surface of the protruding end 6a of the tip shaft 6 of the stop lever 5 and pulling it upward. The lock is released by releasing from the locking surface 4 of the operating lever 3 and the fingertip of the middle finger is locked on the finger-holding surface 3a of the operating lever 3 to rotate the operating lever 3 backward.

Then, even if the lifting of the stop lever 5 is released, the lower end surface of the distal end portion of the stop lever 5 is received by the upper end surface of the operation lever 3 and further downward movement is prevented as shown in FIG. When the operating lever 3 is continuously rotated backward from this state, the rear end projection 3c of the operating lever 3 is rotated downward to push down the valve shaft 9a and bring the lower end surface of the valve shaft 9a into contact. The valve body 9 is moved downward against the force of the coil spring 16 to separate it from the valve seat 17, and the compressed air introduction passage 8 is opened. By this opening, compressed air is supplied from a compressed air supply source to the air motor through the introduction paths 8 and 8a, and the air motor rotates to rotate a working member such as a polishing member mounted on the rotating member 2, and Polishing work can be performed.

Next, when the operation is interrupted or stopped, when the pushing / pulling force of the fingertip on the operating lever 3 is released, the restoring force of the coil spring 16 causes the valve body 9 to move upward and press against the valve seat 17, At the same time, the compressed air introduction passage 8 is shut off and the air motor is stopped, and at the same time, the valve shaft 9a is pushed up to move the rear end projection 3c of the operation lever 3 upward, and the operation lever 3 is rotated forward to the original position. I do. Due to this rotation, the distal end shaft 6 of the stop lever 5 reaches the locking surface 4 while sliding on the inclined surface 3b of the operation lever 3, and locks the operation lever 3.

In the above embodiment, a tool operated by an air motor has been described as a power tool. However, the safety device according to the present invention can be applied to a power tool.

[0019]

[Effect of the invention]

 As described above, according to the safety device for the operating lever of the power tool of the present invention, a finger is hooked on the operating lever pivotally attached to the handle of the tool body, and the operating lever is moved backward against the spring force. In a power tool which is operated by being rotated in the vertical direction, a stop lever constantly pressed downward by a spring different from the above-mentioned spring is pivotably mounted on the vicinity of the upper part of the operation lever so as to be vertically rotatable, A long shaft in the horizontal direction is integrally provided at the end of the stop lever, and a locking surface for locking the lower peripheral surface at the center of the shaft is formed on the upper end surface of the operation lever. Therefore, when not in use, the shaft provided at the end of the stop lever is locked to the locking surface formed on the upper end surface of the operation lever by the spring force. Can be held to click state, therefore, it is possible to improve safety by preventing accidental actuation.

Further, in use, if the stop lever is pushed upward by a fingertip against the spring force while holding the handle, the tip shaft of the stop lever is disengaged from the locking surface of the operation lever. The lock can be easily released, and the operating lever can be continuously rotated backward from this state to quickly operate the tool, thereby performing a predetermined operation smoothly.

In this operation, since the side end of the shaft provided at the end of the stop lever projects outward from the locking surface of the stop lever, the fingertip is hooked on the projected end to move upward. By pushing up, the shaft body of the stop lever can be easily disengaged from the locking surface of the operation lever, and when the tool is operated by rotating the operation lever, the upper end surface of the operation lever becomes the stop lever. The state in which the stop lever is lifted by sliding contact with the lower surface, that is, the state in which the lock is released can be maintained, so that handling and workability are improved.

Further, if the pressing force on the operation lever is released when the operation is interrupted or terminated, the operation lever can be turned forward by the spring force to automatically stop the operation of the tool. At the same time, the shaft of the stop lever moves down along the upper end surface of the operation lever and locks on the locking surface of the operation lever, so that the operation lever can be locked.

[Brief description of the drawings]

FIG. 1 is a cross-sectional side view of a main part when not in use,

FIG. 2 is a front view thereof,

FIG. 3 is a side view showing a cross section of a main part in use.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tool main body 1a Handle part 3 Operation lever 4 Locking surface 5 Stop lever 6 Shaft 7 Spring 8 Compressed air introduction path 9 Valve 9a Valve shaft

Claims (2)

[Utility model registration claims] 1. A power tool which is operated by hooking a finger on an operation lever pivotally connected to a handle portion of a tool body and rotating the operation lever backward against a spring force. A stop lever which is constantly pressed downward by a spring different from the above-mentioned spring is pivotally attached to the upper vicinity of the operation lever so as to be vertically rotatable,
A long shaft in the horizontal direction is integrally provided at the end of the stop lever, and a locking surface for locking the lower peripheral surface at the center of the shaft is formed on the upper end surface of the operation lever. Safety device for operating lever in power tools. 2. The power tool according to claim 1, wherein the power tool has a compressed air introduction passage opened and closed by the operation lever in the tool body, and the air motor is rotated by the compressed air introduced from the compressed air introduction passage. 2. The safety device for an operating lever in a power tool according to claim 1, wherein the rotation of the power tool drives a working member such as a polishing member mounted on a front end of the tool body.