JPS6119904Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a switching valve operating device for a pneumatically operated tool that ensures reliable switching operation.

Conventional pneumatic tool valve systems are e.g.
It is known from Japanese Patent Publication No. 49-27631,
A valve body that regulates compressed air supplied from the outside,
The operating rod that operates this valve body engages linearly,
By pushing this operating rod against air pressure, the valve port is opened and the valve is opened. However, such a device has a drawback that if the operating rod is pushed too strongly, the movable cylinder and the locking ring move simultaneously, the operating rod becomes unfixed, and the valve cannot be maintained in the open state.

In view of the drawbacks of conventional valve devices for air-operated tools, the present invention was developed with the aim of completely eliminating the above-mentioned drawbacks. This feature is characterized in that the valve body is reliably fixed until then.

An embodiment of the present invention will be described below.

1 is a polishing operation disk (hereinafter referred to as the polishing disk) that wraps abrasive paper (not shown), 2 is an air motor that generates minute vibrations in the polishing disk using compressed air, and the device of the present invention is installed on the top of the polishing disk 1. A housing 4 for accommodating the housing 4 is attached via a plurality of elastic supports 3, 3 made of rubber or the like. A valve port 6 is provided in the boss portion 5 provided on one side of the upper surface of the housing 4.
A screw hole 8 is formed on the other side of the valve port 6 to connect one end of a hose (not shown) for supplying compressed air from a compressor (not shown). . Reference numeral 9 denotes a through hole which is continuous with the valve port 6 and penetrates through the boss portion in the horizontal direction, and includes a hole 10 branched from the middle of the through hole 9 and an air supply port 11 provided in the peripheral wall of the air motor 2. are connected by a hose 12.

14 is inserted into the through hole 9 in the axial direction (left and right direction in Figure 1)
It is a rod-shaped valve that is inserted through the valve chamber so as to be able to move forward and backward.A seal ring 15 is attached to one end of the valve 14 located inside the valve chamber 7 to seal the valve port 6, and the other end of the valve 14 located outside A locking ring 16 is attached to the locking ring 16, and a spring 1 is installed between the locking ring 16 and the boss portion 5 to bias the valve 14 in the direction of closing the valve port 6.
Attach 7.

Reference numeral 20 denotes a cover attached to the upper part of the housing 4, and on the front side of the cover 20, on the side opposite to the boss part 5, an opening operator 21 and a closing operator 26 of the valve 14 are stacked in two layers, one above the other, and separated separately. It is attached so that it can move forward and backward. This opening operator 21 is located in the front part in the left and right direction (fourth direction).
It has a finger rest part 22 that expands in a fan shape in the vertical direction in the figure,
A square window portion 24 is formed in the center of the support portion 23 extending from the center of the finger rest in the rear right angle direction,
Inside this window portion 24, an elastic locking piece 25 that is flexible in the vertical direction (vertical direction in FIG. 5) is provided projecting forward and slightly downward at the rear of the support portion 23.

The closing operation element 26 has a finger rest 27 in the front part that extends in the left-right direction (vertical direction in FIG. 6) in a fan shape, and the elastic locking piece 25 extends from the center of the finger rest 27 in the rearward right angle direction. and a support surface 2 that supports the downwardly-oriented free end of the elastic locking piece 25 from below.
8 is provided at the lower part of the slope, and a long hole 30 is provided at the center of the tilt operation part 29 through which the upper end of the convex part 31 shown below appears.
form.

It goes without saying that the protrusion 31 that protrudes and retracts into the elongated hole 30 of the tilt operation part 29 is located on the same straight line as the valve 14 and protrudes from the housing 4. The rear side (valve chamber 7 side) has a vertical portion 32 in order to prevent the closing operation piece 26 from protruding forward, and a convex portion 3 is provided in this elongated hole 30.
1 is in the protruding state, the tip of the elastic locking piece 25 resting on the support surface 28 is touched to prevent it from moving forward. 33 is a spring for applying forward force to the closing operator 26;
6 is pressed against the spring 33, the downwardly inclined operating section 29 of the operating element 26 catches the downward free end of the elastic locking piece 25 and releases the engagement with the vertical surface section 32 of the convex section 31. I'm starting to do that.

Reference numeral 34 denotes a pin protruding downward from the closing operator 26 in order to stabilize the movement of the closing operator 26 in the front-rear direction, and is a long hole (not shown) drilled on the housing 4.
is engaged with.

Next, the operation of the above embodiment will be explained.

An air supply hose (not shown) connected to the discharge port of the compressor is connected in advance to the valve chamber 7 of the polisher, and the compressor is driven. When using the polisher, the opening operator 21 is pushed in the direction of the arrow in FIG. 1 against the elastic force of the spring 17. Opening operator 21
When the valve is pushed in in this manner, the valve 14, which had originally closed the valve port 6 by the spring 17, moves back against the compressed air and opens the valve port 6, causing the valve chamber 7, the valve port 6, and the hose 12 to open. The air motor 2 is driven by supplying air through the air motor 2. When the opening operator 21 retreats, the tip of the locking piece 25 deforms downward by its own elastic force as it retreats along the inclined surface 29 of the closing operator 26, and eventually becomes convex. When it gets over the portion 31, it detaches from the convex portion 31 due to the elastic force and momentarily rides on the support surface 28 of the closing operator 26.
The free end of the locking piece 25 is connected to the vertical surface 3 of the convex portion 31.
It will be facing 2. In this state, even if the opening operation piece 21 is released, the locking piece 25 is locked to the protrusion 31, so the valve port 6 is reliably maintained in the open state, and the air motor 2 continues to operate. .

Next, to stop the air motor 2, when the closing operator 26 is pushed in the direction of the arrow in FIG. 3 against the spring 33, the inclined surface 2
9 pushes up the tip of the locking piece 25, and when the tip of the locking piece rises above the top of the convex part 31, in other words, the convex part 31 sinks into the elongated hole 30, and the locking piece 25 is pushed up. When released, the opening operator 21 moves in the opposite direction of the arrow in FIG. 1 due to the elastic force of the spring 17, returns to its original position, and restores the valve 14 to its original state.
Close the valve port 6. Next, when you release your hand from the closing operation element 26, the same operation element is moved by the spring 33 in the opposite direction of the arrow in FIG. 1 to the state shown in FIG.
Return to the state before startup.

As is clear from the description of the embodiments above, this invention provides a valve that opens and closes the air passage to the drive source of an air-operated tool so as to be movable in the axial direction. The opening and closing controls of the valve are movable in the same direction and are provided in two pieces, upper and lower, and the facing surfaces of both the open and close controls have slopes that are difficult to deform on one side, and slopes on the other side that prevent the valve from closing. An elastic locking piece is provided, the free end of which comes into contact with the upper part of the slope when the operator is not operated, and which contacts the lower support surface of the slope when the operator is in operation. Since the protrusion that restrains the elastic locking piece from returning to its original state is opposed to the elongated hole drilled in the slope, and the upper end is fixed to the hole so as to be freely retractable, it can be activated with a single activation switch. Compared to conventional tools that perform a stop operation, the start operation can be performed separately by operating an open operator, and the stop operation can be performed separately by operating a close operator. Therefore, the air motor is easy to operate; once the open button is pushed in, it remains in that state, and the close button automatically returns when you loosen the pressure of your hand, allowing the valve port to open. , closure can be ensured. In addition, if the opening operator is retracted during use, it is immediately known that the opening operator is in the activated state, so that erroneous operation is prevented and there is no danger.

[Brief explanation of the drawing]

The drawing shows one embodiment of the present invention.
The figure is a vertical side view of the entire structure, Figure 2 is a vertical side view of the main parts when the valve is opened, and Figure 3 is a vertical cross-section of the main parts at the moment the valve is returned from the open state to the closed state. A side view, FIG. 4 is a plan view of the opening operator, FIG. 5 is a side view cut along the line A-A in FIG. 4, FIG. 6 is a plan view of the closing operator, and FIG. 7 is a plan view of the opening operator. FIG. 14 is a housing, 6 is a valve port, 7 is a valve chamber, 14
is a valve, 21 is an opening operator, 25 is an elastic locking piece, 26
28 is a support surface, 29 is a tilting operation part,
30 is a long hole, 31 is a convex portion, and 17 and 33 are springs.

Claims (1)

[Scope of utility model registration request] A valve for opening and closing the air supply path to the drive source of the air-operated tool is provided so that the valve can move forward and backward in the axial direction, and an opening operator and a closing operator of the valve can move forward and backward in the same direction. , and are provided in two stages, upper and lower, and the opposing surfaces of both the opening and closing controls have slopes that are difficult to deform to one side.
On the other hand, an elastic locking piece is provided, which allows the free end of the valve closing operator to contact the slope in a bent state when the valve is not operated, and to contact the lower support surface of the slope when the valve is operated. In this case, a protrusion that restrains the elastic locking piece from returning to its original state when it comes into contact with the support surface is opposed to a long hole drilled in the slope, and the tip of the air locking piece is fixed to the hole so as to be freely retractable. Valve operating device for actuated tools.