JPS6123738Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a safety device for an air tool that prevents the air supply valve of the air tool from malfunctioning.

Conventional air tools, such as air-operated grinders, chisels, polishers, grinders, etc.
It is activated by the operator operating the air supply valve provided in the gripping part. However, since this air supply valve is simply pushed up by a spring, there is a drawback that the air tool may operate due to a malfunction caused by an operator's incorrect operation or an accident when the tool is dropped on the floor. , it was extremely dangerous and required great care during handling.

In view of the fact that conventional air tools had the above-mentioned drawbacks and required careful attention throughout the handling process, this invention completely eliminates the above-mentioned dangers, and in particular, it can be used immediately once the work is stopped. The safety device is activated,
The purpose of this is to reliably prevent unexpected activation when work is interrupted.

An example of this invention will be explained with reference to the drawings.1
is an air-powered tool, such as an air drill,
The main body of a tool such as a grinder, polisher, air chisel, grinder, etc. has a grasping part 2 formed at its rear end.

Reference numeral 3 denotes an air supply path provided in the gripping section 2, and 4 is a hose whose one end is connected to a compressor (not shown) and the other end is connected to the supply path 3 inside the gripping section. Reference numeral 5 denotes a passage that communicates with, for example, an air motor (not shown) housed in the tool body. A valve chamber 6 is provided between this passage 5 and the supply passage 3, and a valve port 7 is provided on the passage side of this valve chamber. A valve body 8, which is seated on the valve body 8, is accommodated in this valve chamber and is springed from below by a spring 9. Reference numeral 10 denotes a valve rod that is integrated with the valve body 8, and has an upper end protruding outside the gripping portion. Reference numeral 20 denotes a recess provided in the upper part of the tool body, and the shaft rod 13 of the stop lever (hereinafter referred to as stopper) 12 accommodated in this recess 20.
A shaft 16 is inserted into a hole 14 provided in the longitudinal direction of the center of the shaft to enable the shaft to rotate, and an upright piece 15 is formed at the center of the upper portion of the shaft. Incidentally, an arc-shaped chamfered portion 17 is provided at the base of the stopper 12 so that the shaft rod can rotate. 21 is recess 2
The bent pieces 26, 26 provided on both sides of the tip of the operating piece 25 are attached to the pins 22 that pass through the bearings and the recesses located on both sides of the operating piece 25, so that the operating piece can pivot. Furthermore, the stopper's upright piece 1 is placed in the notch 27 provided at the center of the tip of this operation piece.
5 is engaged. A spring 28 is wound around the pin 22, one end of which is brought into contact with the side surface of the recess, and the other end is brought into contact with the side surface of the stopper 12. Note that the upper end of the valve rod 10 is always in contact with the lower surface of the operating piece 25.

Note that the cross section of the shaft rod 13 of the stopper is approximately rectangular with the vertical direction longer than the horizontal direction, but the cross section may be circular and the hole 14 may be provided at an eccentric position. 27 and stopper 1
2, a part of the operating piece 25 only needs to engage with the shaft rod 13.

The height of the stem of this stopper is approximately the same as the maximum exposed portion 11 of the valve stem 10 protruding outside the handle.

To operate this tool body 1, connect the compressor (not shown) and the handle part 2 with the hose 4, then hold the handle part 2, and then press the stopper against the spring 28 with your fingertips. 12 in the direction of the arrow X to free the operating piece 25, and then push down the operating piece to push down the valve element 8 against the spring 9. The air is supplied to the air motor through the passage 5 to operate it.

When the operation is completed and you release your hand from the operating piece 25, the operating piece is automatically lifted by the valve lever 10 integrated with the valve body due to the elastic force of the spring 9, and the stopper 12 is lifted up.
is rotated in the opposite direction of the arrow X by the elastic force of the spring 28, returns to its original position, and locks the operating piece 25.

Incidentally, during the operation, that is, while the operation piece is pressed down, the stopper upright piece 12 is housed in the recessed part 20, so it does not pose any problem.

Although the embodiments have been described above, the safety device of this invention is such that a valve body is provided in the fluid passage provided in the grasping part, the tip of which protrudes outside the grasping part, and the valve body is located close to the protruding tip of the valve body. In an air tool in which an operating piece of the valve body is pivotally attached to the valve body, a notch is provided in the valve body operating piece, and a stop lever is biased to be positively engaged by the elastic force of a spring with respect to the notch. Due to the structure in which the valve body is pivoted at the appropriate position, the valve body operating piece cannot be operated unless the stop lever is pushed down against the spring when starting the valve body. When you release your hand from the valve body operating piece after starting the air tool, at the same time, the stop lever moves back due to the elastic force of the spring and automatically returns to the engaged state with the operating piece. In this case, the operating piece has the effect that it cannot be operated unless the stop lever is removed against the spring, which greatly increases the safety of the air tool, and also has the advantage of preventing erroneous operation and malfunction.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention; Fig. 1 is a front view of the handle of the air tool with the main parts cut away, Fig. 2 is a plan view of the same, and Fig. 3 is a perspective view of the stop lever. It is a diagram. 2... Grasping part (handle part), 5... Fluid passage, 8
...Valve body, 10...Valve rod, 12...Stop lever, 25...Valve body operation piece, 27...Notch, 28...
…Spring.

Claims (1)

[Scope of utility model registration request] In an air tool, a valve body is provided in a fluid passage provided in a grasping part, the tip of which protrudes outside the grasping part, and an operating piece of the valve body is pivoted at a position close to the protruding tip of the valve body. A safety device for an air tool in which a notch is provided in the valve body operating piece, and a stop lever biased to positively engage with the notch by the elastic force of a spring is pivoted at an appropriate position in the grip.