JPH0929666A - Safety device for pneumatic tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a pneumatic tool with respect to unexpected accidents or injuries caused by a tip part driven by careless touch with an operating lever of the pneumatic tool or the contact the operating lever with the surrounding. SOLUTION: A slide guide hole 16 for a lock button 2 is provided in the direction orthogonal to an operating lever 3 mounted to a pneumatic tool body 1 for driving a valve. A lock button 2 having an operating lever 3 receiving part is mounted to the slide guide body 16 so that the tip of the lock button is urged from the inside by a spring to go in and out of the side of the body 1. Thus, only when the lock button 2 is pushed in, the operating lever 3 is allowed to move.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic tool safety device operated by pneumatic pressure.

[0002]

In the pneumatic tool, the valve inside the main body is opened by gripping the operating lever attached to the main body, and air is sent to the drive mechanism to engage with the drive mechanism. It is designed to drive tip tools such as cutting blades and nipping blades. Therefore, if you touch the operating lever carelessly, or if the operating lever hits something around you when you place the pneumatic tool, the valve will open,
There was a risk of accidental injury or injury due to the driven tip.

Therefore, an object of the present invention is to provide a safety device for a pneumatic tool in which an operating lever does not move carelessly.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention has a valve for opening and closing a ventilation path communicating with a pneumatically driven drive mechanism, which is pushed by an operating lever attached to a main body. Then, in the pneumatic tool configured to drive and stop the tip tool engaged with the drive mechanism, a lock button for preventing the movement of the operation lever is provided from one side of the main body in a direction orthogonal to the movement direction of the operation lever. Provided so that it can be retracted and urged by a spring, a receiving portion for the operating lever is provided at a predetermined position inside the lock button so that this receiving portion is located in the extension direction of movement of the operating lever when the lock button is pushed, The operation lever can be moved only when the lock button is pushed.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a body 1 of a pneumatic tool. This pneumatic tool is such that an air hose (not shown) is connected to an intake port 4 provided at the rear portion of the main body 1 (rightward in the figure), and an air supply source such as an air compressor (not shown) is connected via this air hose. By sending compressed air and operating the internal drive mechanism, the front part of the main body 1 (left direction in the figure)
A tip tool (not shown) such as a cutting blade or a nipping blade attached to is driven.

FIG. 2 is a longitudinal sectional view of a main part of the pneumatic tool body 1. In the figure, reference numeral 5 indicates a cylinder of the drive mechanism, and the cylinder 5 includes a rear intake port 4 and ventilation passages 6, 7
Through the. Also, in these ventilation paths 6 and 7,
A valve 8 for opening and closing the ventilation path is provided. Reference numeral 8a indicates a ball valve of the valve 8, and reference numeral 8b indicates a spring for urging the ball valve 8a.

Further, a pin holding hole 17 having a small diameter is provided in the main body 1 below the ball valve 8a, and the pin 9 is inserted into the pin holding hole 17.
Is slidably fitted. Further, outside the pin 9 (downward in FIG. 2), an operation lever 3 whose one end is rotatably attached to the main body 1 by a shaft 10 is positioned, and between the other end of the operation lever 3 and the main body 1. A spring 11 for returning the operation lever 3 is inserted in the above.

Here, the pneumatic tool safety device according to the present invention is locked in the lateral direction of the main body 1 above the tip side of the operating lever 3 (rightward in FIG. 2) (direction orthogonal to the rotating direction of the operating lever). The slide guide hole 16 of the button 2 is formed,
The lock button 2 is inserted into the slide guide hole 16 as shown in FIG. The lock button 2 is non-rotatably and slidably fitted in the slide guide hole 16, and a receiving portion 2a of the operation lever 3 is provided at a predetermined position inside thereof (right side in FIG. 4). ing. The lock button 2 is urged by a spring 14 inserted between the lock button 2 and a mounting screw 15 that closes one of the slide guide holes 16 in a direction in which the tip of the lock button 2 projects from the other of the slide guide holes 16.

In FIG. 2, reference numeral 12 is fixed to the main body 1 with a screw 13 to restrict the outward rotation of the operating lever 3,
A locking member for preventing the spring 11 from falling off, and 8d is a ball valve 8
Valve sealing screws 8a and 9a for hermetically mounting a in the main body 1 are hermetic packings.

Next, the operation of the pneumatic tool safety device according to the present invention having the above structure will be described.

First, even if the user operates the pneumatic tool by gripping the operating lever 3 as in the conventional case, the lock button 2 is positioned above the operating lever 3 and its rotation is blocked, so that the valve 8 is opened. No, the pneumatic tool does not work. For the operation thereof, first, as shown in FIG. 1, when the tool body 1 is held, the thumb pushes the lock button 2 protruding to the side surface of the body 1 against the urging force of the spring 14 provided therein. As a result, the receiving portion 2a (see FIG. 4) formed at a predetermined position inside the lock button 2 moves above the operation lever 3, and when the operation lever 3 is gripped in this state, the upper end of the operation lever 3 moves. By entering the receiving section 2a,
Rotates about the shaft 10 against the biasing force of the spring 11,
The pin 9 located above it is pushed up. This pin 9
Is a spring 8b that pushes up a ball valve 8a that is pressed in a direction of closing the inlet 7a of the air passage 7 and opens the valve 8 to open the air passage 6 that is in communication with the air supply source side. The compressed air is sent into the cylinder 5 by communicating with the air passage 7 communicating with the cylinder 5. As a result, the piston (not shown) slidably fitted in the cylinder 7 moves, and the tip tool engaged with this piston is driven to perform the necessary work.

Further, when the work is completed or interrupted, if the gripping force of the operating lever 3 is loosened, the operating lever 3 will move to the spring 11.
It returns to its original state by the urging force of the pin 9 and the ball valve 8a at the same time.
Also, the ball valve 8a closes the inlet 7a of the air passage 7 by restoring the original state by the urging force of the spring 8b, and stops the sending of the compressed air to the drive mechanism. Therefore, the driving of the tip tool is stopped.
At this time, if the lock button 2 is still pushed in, the next work can be started simply by grasping the operation lever 3. Further, unless the lock button 2 is held down, when the operation lever 3 is rotated and its upper end is disengaged from the receiving portion 2a, the lock button 2 is moved in the projecting direction by the urging force of the spring 14 and the operation lever 3 is rotated. The safety device to prevent movement is restored to the activated state.

As described above, the safety device for a pneumatic tool according to the present invention prevents accidents and injuries due to careless driving of the tip tool, with almost no loss of operability, and the safety of the pneumatic tool. It improves the sex.

The operating lever 3 of the pneumatic tool illustrated above is used.
Has its front side (left side in FIG. 1) attached to the main body 1 by a shaft 10 so as to be rotatable rearward, but this operation lever 3 is pivotally attached to the main body 1 at the rear side (right side in FIG. 1) so as to be forward rotatable. The valve 8 may be opened by being worn on the body 1 or by being pushed into the body 1. The shape and the method of attaching the valve 8 to the body 1 are arbitrary.

Although the cylinder device is shown as the drive mechanism for the tip, the drive mechanism only needs to be able to drive the tip with air pressure, and the mechanism may be another mechanism using an impeller or the like.

[0017]

As described above, in the safety device for a pneumatic tool of the present invention, the operating lever does not move unless the lock button is pushed in, so an accident or injury due to the tip tool being inadvertently driven. It is prevented, and the handling and safety of the pneumatic tool are improved.

[Brief description of drawings]

FIG. 1 is a side view showing a usage state of a pneumatic tool body using a safety device according to the present invention.

FIG. 2 is a longitudinal sectional view of a main part of a pneumatic tool main body using a safety device according to the present invention.

FIG. 3 is a bottom view of a pneumatic tool body using the safety device according to the present invention.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

[Explanation of symbols]

 1 Main body of pneumatic tool 2 Lock button 2a Receiving part 3 Operating lever 4 Inlet port 6,7 Vent passage 8 Valve 8a Ball valve 8b Spring 8c Airtight packing 8d Valve sealing screw 9 pin 11,14 Spring 16 Slide guide hole

Claims (1)

[Claims] 1. A valve that opens and closes a ventilation path that communicates with a drive mechanism that operates by air pressure is pushed by an operating lever attached to the main body to drive and stop a tip tool engaged with this drive mechanism. In the pneumatic tool to be performed, a lock button for preventing the movement of the operation lever is provided in a direction orthogonal to the movement direction of the operation lever so as to be retractable from one side of the main body, and is biased by a spring so as to project. A receiving portion for the operating lever is provided at a predetermined position inside the lock button, and when the lock button is pushed, the receiving portion is positioned in the extension direction of movement of the operating lever so that the operating lever can move only when the lock button is pushed. Safety equipment for pneumatic tools characterized by being made.