JP4005653B2 - Pneumatic tool valve device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a valve device for various pneumatic tools such as an air driver, an impact wrench, a torque control wrench, and an open end wrench, and more particularly to a valve operating mechanism.
[0002]
[Prior art]
Conventionally, in a valve device that operates a pneumatic tool, a single lever is operated to switch and shut off a supply path for compressed air for operation (referred to as air throughout this specification), and to reverse, forward, and stop the air motor. There is an operating mechanism that can be used. This operating mechanism uses the other end of the valve lever pivoted at one end to the grip of the main body of the pneumatic tool as the operating end, and the intermediate position is brought into contact with the push rod of the valve to return the valve body of the valve. The reverse rotation and the normal rotation are switched by pushing the valve lever in two stages against the urging force in the valve closing direction by the spring.
[0003]
[Problems to be solved by the invention]
By the way, in the operation mechanism in the valve device, the reverse rotation and the forward rotation operation can be sequentially obtained from the stop state of the pneumatic tool by the single lever operation according to the pressing amount of the valve lever by the operator's manual adjustment. However, it is difficult to understand whether the operation state of the tool is reverse rotation or normal rotation, or the conversion point from the reverse rotation operation to the normal rotation operation. Such a problem can be solved by providing different operation members for the reverse rotation and the normal rotation, but by doing so, the advantage of the single lever operation is lost.
[0004]
Therefore, the present invention provides a sense of operation and a sense of operation by using a single valve lever for operating the pneumatic tool in reverse and forward rotation, and making the movement in opposite directions with respect to reverse and forward rotation. It is a first object of the present invention to provide a valve device for a pneumatic tool provided with an operation mechanism that matches the rotation direction to be generated, thereby reducing the possibility of erroneous operation.
[0005]
Further, in the conventional operation mechanism described above, when the pneumatic tool is changed from the stopped state to the intended rotational operation state, it is not possible to return to the normal rotation state unless the reverse rotation state is always performed. Inconvenient. Accordingly, a second object of the present invention is to immediately obtain a desired reverse rotation and forward rotation operation of the pneumatic tool according to the operation of the valve lever.
[0006]
Furthermore, a third object of the present invention is to make it possible to easily and visually confirm the reverse and forward rotation of the pneumatic tool from the movement of the valve lever.
[0007]
[Means for Solving the Problems]
In order to achieve the above first and second objects, the present invention comprises a valve lever connected to a rod for operating a valve body of a valve device, and switches the valve by the stroke of the rod by operating the valve lever to change the air. in the valve apparatus for performing forward and reverse operation switch of the dynamic tool, said valve lever, and the central portion and the fulcrum, automatically a seesaw-like lever that will be held back to the neutral position by the urging force of the spring, One end of the lever is connected to the rod so that its pressed position coincides with the stroke end in the pushing direction of the rod, and the other end of the lever that is on the free end side is connected to one end of the lever by pressing down The rod is pulled up, and the valve includes an air supply port connected to an air supply source, a pair of air supply / exhaust ports connected to a rotor chamber of an air motor of the pneumatic tool, and an exhaust port. The valve body is connected to the rod, and as the rod is pushed and pulled, both the air supply port communicates with one air supply / exhaust port and the other air supply / exhaust port communicates with the exhaust port. It is characterized by operating between the stroke ends and taking a neutral position where communication between the air supply port and both the air supply / exhaust ports is interrupted between the stroke ends.
[0008]
And in order to achieve the said 3rd objective, the structure provided with the mountain-shaped lever guard which makes the lift of the other end conspicuous along the side part of the said valve lever stand along with pushing down of the one end of this valve lever is taken. .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0010]
1 to 4 show an embodiment of a valve device for a pneumatic tool to which the present invention is applied. As shown in the cross-sectional view of FIG. 1 and the top surface of FIG. 2, the valve device V is similar to the conventional one in the grip 10 integrated with the main body 1 that houses the air motor 2 of a pneumatic tool. Further, the air motor 2 is arranged in a form inserted in an air supply / exhaust passage.
[0011]
The air supply / exhaust passage formed in the grip portion 10 includes an air supply passage 11, an exhaust passage 13, and an air supply / exhaust passage 12. The air supply passage 11 opens at an end of the grip portion 10, An air supply port 11a connected to the air supply hose extends to a valve hole 14 that crosses the grip 10. The exhaust passage 13 bypasses the air supply passage 11 from the valve hole 14 and opens at the end of the grip portion 10, and the filter unit 9 is fitted in the opening 13a. The air supply / exhaust passage 12 is composed of a pair of air supply / exhaust passages for reverse rotation and forward rotation connected to the rotor chamber of the air motor 2. Only the reverse supply / exhaust passage 12r is shown in the figure, and the forward supply / exhaust passage is not shown because it is located at a position different from the cross section of the drawing.
[0012]
The valve hole 14 that crosses the grip 10 is a stepped hole having a large diameter on the side continuous with the air supply path 11, and is connected to the reverse supply / exhaust path 12r and the forward supply / exhaust path around the small diameter part of the stepped hole. Two supply / exhaust grooves 14r and 14f and an exhaust groove 14e connected to the exhaust path 13 are formed. In the small diameter portion of the valve hole 14, the bottomed bush 3 is fitted with the flange portion on the outer periphery of the opening 30 abutting against the stepped portion of the valve hole 14, and the bottom portion is substantially the grip portion 10. The valve hole 14 is closed at the surface position.
[0013]
On the opening 30 end side of the bush 3, a poppet-shaped main valve body 4 is disposed so as to be seated in a reverse seat arrangement with a urethane 31 packing 31 disposed on the opening end face as a valve seat. It is urged in the seating direction by a return spring 16 comprising a conical coil spring or the like having a screw lid 15 closing the large diameter side opening as a spring seat. A central hole 41 is formed in the main valve body 4, and the central hole 41 opens to the outer periphery of the main valve body 4 by a plurality of small holes 42 formed near the bottom thereof. In the bottomed bush 3, a stepped piston-like switching valve body 5 in which a rod 54 is continuously connected and integrated is slidably inserted into the inner periphery of the bush 3 so that the small diameter is reduced. The return spring 17 is formed of a cylindrical coil spring or the like that is slidably fitted into the center hole 41 of the main valve body 4 and is disposed in a compressed state between the large diameter portion 51 and the bottom of the bush 3. Accordingly, the main valve body 4 is arranged to be urged in the contact direction. The switching valve body 5 is formed with a communication hole 53, one of which opens to the end surface of the small diameter portion 52 and the other of which opens to the peripheral surface of the large diameter portion 51.
[0014]
On the peripheral wall of the bush 3, there are three-stage ports comprising two supply / discharge ports 34r, 34f and one exhaust port 34e. When the bush 3 is assembled into the valve hole 14, the respective ports 34r, 34f, 34e are provided. It is formed at a position aligned with the supply / discharge grooves 14r, 14f and the exhaust groove 14e.
[0015]
The rod 54 extending from the large-diameter portion 51 of the switching valve body 5 protrudes to the outside of the grip portion 10 through the bottom hole of the bush 3, and a long hole 54 a that is long in the direction intersecting the axis of the rod 54 is pinned at the tip. It is formed as a through hole. A lever base 60 having a valve lever 6 pivotally attached thereto is screwed to one side (the upper surface in FIG. 1) of the main body grip 10. As shown in FIG. 2, the lever base 60 is provided with a mountain guard lever 61 in a side view along both sides of the valve lever 6, and the valve lever 6 is pivotally fixed to the top of the lever guard 61. The valve lever 6 is bent into a seesaw shape that is bent at a pivot point where the pin 62 is fixed, and both ends are lifted. The connecting pin 63 is connected to the valve lever 6 through a long hole 54 a at the tip of the rod 54, and the arc movement of the connecting end caused by the swinging of the valve lever 6 can be converted into linear movement of the rod 54.
[0016]
The valve device V configured in this way operates as follows.
FIG. 1 shows a neutral state of the valve device V, that is, a supply air cutoff state. In this case, the main valve body 4 is seated at the end of the opening 30 of the bush 3 constituting the air supply port during forward rotation by the urging force and air pressure of the return spring 16, and the switching valve body 5 is attached to the return spring 17. It is in contact with the bottom of the central hole 41 of the main valve body 4 by force. Needless to say, the load setting of the return spring 17 of the switching valve body 5 in this case is set so that the main valve body 4 is not opened against the urging force of the return spring 16 and the air pressure. Absent. At this time, the small hole 42 of the main valve body 4 constituting the air supply port at the time of reverse rotation is closed at the outer periphery of the distal end of the switching valve body 5, and the air supply is shut off. Therefore, the valve lever 6 is held in a neutral position, that is, in a state where both ends of the seesaw-shaped lever 6 are lifted up evenly, and both ends of the valve lever 6 protrude slightly from both skirts of the mountain guard lever 61 in a side view. It is possible to easily confirm that the neutral state is obtained by touch and also by visual observation.
[0017]
When the free end (left end in FIG. 1) side of the valve lever 6 is pushed down from this state, the reverse state shown in FIG. 3 is obtained. In this case, the main valve body 4 remains seated, and only the switching valve body 5 is pulled up against the urging force of the return spring 17 as the rod 54 is pulled. As a result, the small hole 42 of the main valve body 4 as an air supply port is opened, the center hole 41, the communication hole 53, and the port 34r communicate with each other, and the air supply path 11 is connected to the reverse supply / exhaust path 12r. Communicate with. As a result, the supply air is supplied to the rotor chamber of the air motor 2 and reverses the motor 2. The exhaust after driving the motor passes through the port 34f, the small diameter portion of the switching valve body 5 in the bush, the exhaust port 34e, and the exhaust groove 14e, and is discharged from the exhaust path 13 to the atmosphere through the filter unit 9. . In this case, from the neutral position of the valve lever 6, an operation of simply pushing down the free end (indicated by a white arrow in FIG. 3) of the seesaw-shaped valve lever 6 is performed, so that the possibility of erroneous operation is avoided.
[0018]
Next, as shown in FIG. 4, when the connection end (indicated by a white arrow in FIG. 4) of the valve lever 6 is pushed down from the neutral state, a normal rotation state is obtained. In this case, as the return spring 16 of the rod 54 is pushed against the air pressure, the main valve body 4 is also integrally pushed down by being pushed by the switching valve body 5. Thereby, the opening 30 end of the bush 3 as an air supply port is opened, and the port 34 f communicates with the air supply path 11. Therefore, the air is supplied to the rotor chamber of the air motor 2 through the large-diameter portion of the valve hole 14, the periphery of the small-diameter portion of the switching valve body 5 in the bush 3, the port 34f, the supply / exhaust groove 14f, and the normal supply / exhaust passage. The supplied motor 2 is rotated forward. The exhaust after driving the motor passes through the port 34r, the periphery of the rod 54 in the bush 3, the exhaust port 34e, the exhaust groove 14e, and is discharged from the exhaust passage 13 to the atmosphere through the filter unit 9. Also in this case, since the operation of simply pushing down the connecting end side of the seesaw-like lever 6 from the neutral position of the valve lever 6, the possibility of erroneous operation is avoided.
[0019]
Thus, in the valve device V of the above embodiment, the free end side and the connected end side with respect to the neutral position shown in FIG. 1 where the valve lever 6 is automatically returned and held by the urging force of both springs 16 and 17. Since the reverse rotation and forward rotation of the air motor 2 are switched by pushing down the opposite portions of the single valve lever 6, as in the conventional operation of switching forward and reverse rotation by depressing the valve lever 6. The possibility of erroneous operation is extremely reduced. In addition, since the neutral state is set to the forward / reverse intermediate position on the operation of the valve lever 6, the required rotational direction can be obtained directly by simply pushing down either end of the valve lever 6. .
[0020]
As described above, the features of the present invention have been described based on an embodiment that is embodied by a combination of preferred embodiments. However, the present invention is not limited to the specific configurations illustrated, and Various specific configurations can be adopted within the scope of matters described in the individual claims.
[0021]
【The invention's effect】
According to the first aspect of the present invention, it is possible to select and switch between the reverse rotation and the forward rotation while enabling the reverse rotation and the forward rotation operation of the pneumatic tool by the operation of a single valve lever as in the prior art. Since a delicate lever operation can be eliminated, the possibility of erroneous operation can be reduced and the operability of the pneumatic tool can be improved.
[0022]
In addition, since the desired reverse rotation and forward rotation operation of the pneumatic tool can be obtained immediately by only pushing down one end of the valve lever, the operability of the pneumatic tool can be further improved. . In addition, during the forward / reverse switching operation, a neutral state is obtained at an intermediate position between these operations, so that the operation feeling and the switching operation of the rotational direction caused thereby can be matched conceptually. The possibility can be virtually eliminated.
[0023]
Furthermore, according to the configuration of the second aspect , the movement of the valve lever and the reverse and forward rotation of the pneumatic tool can be clearly confirmed by touch or visual observation. It can be further reduced.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view showing a valve device arrangement portion of a pneumatic tool according to an embodiment of the present invention.
FIG. 2 is a plan view of the valve device arrangement portion.
FIG. 3 is a partial cross-sectional view showing the operating state of the valve device during reverse operation of the pneumatic tool.
FIG. 4 is a partial cross-sectional view showing an operating state of the valve device during forward rotation of the pneumatic tool.
[Explanation of symbols]
V valve device 2 air motor 4 main valve body 5 switching valve body 6 valve lever 30 opening (air supply port)
34r Supply / exhaust port 34f Supply / exhaust port 34e Exhaust port 42 Small hole (supply port)
54 Rod 61 Lever guard

Claims (2)

In a valve device that includes a valve lever connected to a rod that operates a valve body of the valve device, and switches a valve by a stroke of the rod by operating the valve lever to switch forward / reverse operation of the pneumatic tool, the valve lever includes: , with its central portion and the fulcrum, automatically a seesaw-like lever that will be held back to the neutral position by the biasing force of the spring, one end, pushing direction of the stroke of the rod and the depressed position of the lever The other end of the lever, which is connected to the rod so as to coincide with the end and the free end side is pulled up, pulls up the rod connected to one end of the lever by pressing down, and the valve is connected to the air supply source An air supply port, a pair of air supply / exhaust ports connected to a rotor chamber of an air motor of a pneumatic tool, and an exhaust port, the valve body is connected to the rod, As the rod is pushed in and pulled up, the air supply port communicates with one air supply / exhaust port and the other air supply / exhaust port communicates with the exhaust port. A valve device for a pneumatic tool characterized by having a neutral position that blocks communication with both supply and exhaust ports . 2. A valve device for a pneumatic tool according to claim 1 , wherein a chevron-shaped lever guard is provided along a side portion of the valve lever so as to conspicuously lift the other end when the one end of the valve lever is pushed down. .

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