JPS5935748B2 - impact actuated air tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dowel pin in a synthetic resin mold, for example.
Effective for removing fixing members, etc. of other types of equipment, and driving pins, etc.
It relates to air operated tools.

Conventionally, knock pins or locking pieces that are used in the assembly and disassembly of molding molds or other main parts of equipment in synthetic resin molding factories and other various mechanical equipment are installed by removing them from their positions and disassembling them. In order to do this, a bolt with a head is screwed into a screw hole for removing the bolt that is pre-provided on a pin or other shaped locking piece that has been fitted into the target location, or a portion of the bolt is cut. The hook drilled there uses the entire retaining hole, and in the case of the above-mentioned foreign tax bolt, the hook that engages the head is made of metal, and this hook has a gold tip. Use a tool consisting of a fixed, long-handled rod with a movable weight of appropriate weight and easy to grip attached to the rod in a slidable manner. Hook the tool onto the removal bolt, grasp the handle of the tool with one hand, and pull it while sliding the movable weight to apply impact force to the flange attached to the end of the handle of the tool, and use the rod to impact the object. A method of pulling out by applying thrust is often used.

Of course, mechanical methods using fluid pressure or screw numbering mechanisms installed as permanent equipment in the factory may be used, but
The above-mentioned tools are often used to pull out pins, etc. in a free position, and when such tools are used, the work efficiency is low, and therefore it is naturally inconvenient in a workplace where pins, etc. are often attached and detached. There is.

In view of the current situation, it is an object of the present invention to provide a pneumatic tool that can perform this type of work more rationally, and can also perform the work of driving pins, etc., if necessary.

That is, the present invention provides an alternately operated automatic switching air intake valve mechanism in the air intake passage leading from the main air intake valve to the cylinder in which the free piston is installed, and the automatic switching air intake valve mechanism causes the free piston to move. In an impact-operated pneumatic tool that reciprocates within a cylinder and applies an impact force to an operating rod fitted on the axis of the cylinder to perform a desired work, the operating rod is fitted into the cylinder and integrated with the head. The tip of the operating rod protrudes to the outside through the main body or a cover fixed to the main body, a removable metal fitting of an auxiliary tool such as a pin is fixed to the protruding end of the operating rod, and the other end of the cylinder is fixed to the protruding end of the operating rod. A movable cover that is movably fitted in the axial direction is attached to the main body, and a recoil-eliminating space is formed between the fitted end of the movable cover and the back surface of the operating rod head.

In the present invention, a cylinder having an alternately operated sleeve-type automatic air supply valve mechanism is fitted inside a main body provided with a main air supply valve, and the automatic switching air supply valve mechanism is installed in the cylinder. An operating rod integral with the head is provided on the central axis with the head disposed at a position apart from the head, and the rod end protrudes outward from the fixed cover fitted into the main body, and the inner end of the fixed cover is A free piston is provided in the cylinder between the cylinder and the head by being fitted onto an operating rod, and a removable fitting for a pulling aid such as a pin is fixed to the protruding end of the operating rod. The center part of a movable cover is movably fitted in the axial direction at the other end, and a recoil elimination space connected to the automatic air supply valve mechanism is formed between the cover fitting end and the operating rod head. It is.

According to the present invention, the fixed cover fitted to one end of the main body and the movable cover engaged to the other end are attached to the side of the main body by applying spring force to the flange surface and bolting. When the free piston is fastened, only the movable cover is movable in the axial direction by an appropriate amount when the free piston is struck, so that the reaction force acting on the operating rod head at the time of striking is eliminated.

In addition, the present invention integrally forms the production movement rod on the opposite side of the operation rod head with an appropriate length on a coaxial line, and the stepped recess and the production movement rod through hole are coaxially formed in the central boss portion of the movable cover. An anvil and a finder sleeve loosely fitted onto the anvil are arranged in the recess with coil springs interposed between the stepped portion and the inner end, and the finder sleeve is engaged with the flange of the finder sleeve. A movable adjustment nut is screwed into the recessed opening, so that the end of the auxiliary actuating rod abuts against the anvil head, thereby applying impact force to the anvil.

A protector such as synthetic resin or rubber is fixed to the outer periphery of the protruding end of the finder sleeve when it comes into contact with the surface of the object, and the inner periphery of the protruding end is designed to receive the head of the object to be struck as necessary. It was formed in

Furthermore, the pull-out latch attached to the tip of the operating rod is screwed onto a dowel pin, etc., which engages with the metal. It is configured to be used in combination with a flange that can be removably attached to a sleeping area.

Next, one embodiment of the present invention tool will be described in detail with reference to the drawings.The tool shown in FIGS. The main body 1 is formed by protruding a hollow frame-shaped tank 3 from the part 2 upward and downward in the figure.A fixed cover 3 is fitted to one end of the main body 2 of the main body 1, and a movable cover is fitted to the other end. 4 are engaged, and the covers 3, 4 and the main body 1 are integrally fastened by bolts 5 on both sides of the main body by bringing the coil springs 6 into contact with the flange 41 of the movable cover 4. Inside the main body 1 thus constructed, a cylinder 7 is placed with its center aligned with the central axis of the main body 2 of the main body, and a threaded portion 7' carved on the outer periphery of one end is fixed to the threaded portion 3 on the inner periphery of the cover 3. (The other end is fitted into the support hole 2' drilled at one end of the main body, and a hole 3' drilled at the center of the fixed cover 3 is inserted into the cylinder γ.) An operating rod 10 with a head 11 disposed near the movable cover 4 is provided integrally with the operating rod 10, and a cylindrical rod is fitted between the head 11 and the inner end of the fixed cover 3 and is fitted onto the operating rod 10. A free piston 13 is provided.

A sleeve-shaped automatic switching air supply valve mechanism 20 is fitted into the inner end of the cylinder 7, and the air supply valve mechanism 20 includes a main air supply valve 30 provided on the handle 3 of the main body 1. The air supply valve mechanism 10 shown in FIG. It consists of a valve box 21 which is fitted inside the end and whose outer end is brought into close contact with a catch plate 29 fitted into the fixed cover 3, and a sleeve-shaped valve 22 which is slidably fitted inside the valve box 21, as shown in the figure. Like the valve 2
2 is provided with a stepped portion between the inner end and the outer circumferential portion thereof so as to slide in the axial direction due to a pressure difference, and an air supply/exhaust passage is also formed between the valve box 21 and the valve box 21 side.

In addition, a switching supply/exhaust hole 23 provided in the valve box 21
．． 23' is configured to be switched by sliding the valve 22 back and forth, and the tip of the through hole 17 has an opening 1 that communicates with the front side of the operating rod 10 and the head 11 and the rear buffer chamber 16.
7f17" is provided, and the piston 13 of the cylinder 7
On the working chamber side, a through hole 18f18'' is bored in the middle part and the other air supply/exhaust hole 18, and a hole 18f18'' is formed in the middle part of the cylinder 7 so as to communicate with the exhaust hole 18 and the through hole 25'. An annular primary exhaust chamber 27 is formed on the outer periphery of the main body 1 by a cap-shaped ring body 8, and exhaust gas is discharged from this primary exhaust chamber 27 into the inner space of the main body 1 through an appropriate number of through holes 8'. 28 secondary exhaust chambers are constructed in the internal space of the main body 1 so as to
Exhaust gas is silently discharged from the secondary exhaust chamber 28 to the outside through a plurality of small holes 28' formed in the side of the main body 1.

Further, as described above, the movable cover 4 is movably fastened to the main body at the flange 41 with bolts 5, 5, and a boss 4' protruding inward at the center thereof is fitted into the inner end of the cylinder 7. The part inserted into the cylinder 7 is slidably fitted to form a buffer chamber 10, and a stepped recess 43 is formed in a central boss 42 that can protrude outward, and a stepped recess 43 is formed in response to the cover. An anvil 4 of an appropriate length is inserted through a hole 4'' drilled in the center of 4 to expose the tip of a production movement rod 12 that is integrally coaxial with the operation rod 10, and is operated by this production movement rod 12.
4 and a finder sleeve 45 that loosely fits onto the anvil 44 are arranged with winding springs 46° 46' interposed between the step portions 43', 43'' of the recess 43 and each inner end. A sleeve-shaped adjusting nut 48 is provided by screwing onto a female thread 47 provided on the inner periphery of the opening of the recess, and a collar 45' of the finder sleeve 45 is attached to an inner circumferential step 48' of this nut 48.
is engaged, and by rotation of the adjustment nut 48, the sleeve 45
The dimensions of the entrance and exit can be adjusted.

An annular protector 45'' made of synthetic resin or rubber is attached to the outer periphery of the tip of the finder sleeve 45, and the inner end is formed so that the end of the object to be struck can easily enter, and the inner periphery of the rear end. The surface is formed by cutting an inclined surface into which the head 44' of the anvil 44 is received.

A metal 35 is attached to the protruding end of the operating rod 10, and an example of this metal 35 is the adapter 36 flange 36 of the extraction bolt B as shown in FIGS. 1 and 4. ′
It has a cut groove 35' with a step 35'' that can be engaged with, and the rear part is fixed to the end of the operating rod 10, and the adapter 3
6 has a port in its central stepped hole 36" as shown in Figure 1.
The bolt head B' is fixed by a plug 37 that is inserted into the stepped hole 36'' and screwed into the stepped hole 36''.

In the figure, reference numeral 32 is an air supply hose connection port, 33 is a main air supply valve operating spindle, 34 is a main air supply valve operating lever, 3' is a handle grip, 9 is an auxiliary bundle, 50 is a cover, 51, 52
, 53 are O-rings for sealing, 22' and 23'' are small ventilation holes, 49 is a stopper pin, and 48'' is a notch for positioning the nut.

To explain the operation of the tool of the present invention, a compressed air supply hose from a compressed air source is connected to the air supply hose connection port 32 provided in the handle 3 of the main body 1, and the tip of the operating rod 10 is pulled out. An adapter 36 with a bolt B head B electrically attached to the pin or locking piece that is to be pulled out in advance is engaged with the cut groove 35' of the hook 35, and the corresponding hind leg adapter 36 is attached to the hook 35. With the hook engaged with the stepped part 35'' of the metal 35, hold the tool handle 3 and the auxiliary bundle 9, and while keeping the main body 1 in the pulling direction, move the main air supply valve operating lever 3.
4 and open the main air supply valve 30, the air supply vent 3 will be opened from the valve.
Pressurized air flows into the air supply chamber 15 to the automatic switching air supply valve mechanism 20 through the valve 22, and in the state shown in FIG. Since pressure enters the inner space 24 of the free piston 13, the free piston 13 is opened to the atmosphere through the exhaust holes 18' and 18'' at this point, so the difference between the front and rear of the free piston 13 is The free piston 1 suddenly moves toward the head 11 due to the pressure and collides with the head 11.
In the moving process of step 3, the through hole 23 into the cylinder 7 is first opened during the initial movement.
' is closed, and during this time the valve 22 slides toward the head 11 side, cutting off the air supply to the air supply/exhaust hole 17, and conversely, the valve 22 forms the air hole 23' inside the cylinder 7. The communication chamber 25 communicates with the primary exhaust chamber 27 via the communication hole 25', and the differential pressure across the free piston 13 is maintained.Then, the communication hole 18'' is closed by the piston 13, so that the inside of the cylinder 7 is The exhaust is from opening 1
7', passes through the through hole 17 and the communication chamber 25, flows from the through hole 25' to the primary exhaust chamber 2γ, and is discharged to the secondary exhaust chamber 28, and the free piston 13 closes the intermediate hole 18''. Immediately before release, air is supplied to the annular space 26 formed by the valve box 21 and the front part of the valve 22 and the rear part of the valve 22 through the vent hole 23'' through the opened air hole 18'. Pressure is introduced into the annular air supply space 26°' formed by the valve box 21 and the valve box 21, and at this moment the operating force acting on the valve 22 during its previous movement is overcome and the valve 22 is returned to its original position. It is,
Just before the free piston 13 collides with the head 11, the intermediate vent 18'' opens, and the rear side of the free piston of the cylinder 13 is exposed to the atmosphere, and by switching the valve 22, the air supply vent 23'' is transferred from the air supply chamber 15 to the air supply vent 23''. Pressure flows into the head side of the cylinder 1 from the opening 17' through the communication chamber 25 and the supply/exhaust vent 17, and the piston 13 is pushed back. Through hole 1
8' to the annular space 26 and the exhaust chamber 21 via the conduction hole 25''.
It is discharged at ゜28.

In this way, impact force is applied by causing the piston 13 to collide with the head 11, and this action is repeated frequently, resulting in frequent retraction impact force being applied only in the backward direction to the operating rod 10 that is integrated with the head 11. As a result, the operating rod 1
The latch at the tip of the bolt 35 is connected to the adapter 36 that is connected to the bolt 35, and the bolt B for pulling out violently applies shock vibrations in the pulling direction to the target knock pin or locking piece A, and the locking friction force is rapidly generated. You can make it disappear by making it disappear.

When the moving impact force of the free piston 13 is applied to the head 11 of the operating rod 10, the head 11 moves backward due to the reaction, and the head 11
Part of the pressure air is also supplied to the buffer chamber 16 behind the buffer chamber 16 to cause the operating rod to return, so that the pressure in the buffer chamber 16 would normally be compressed at the moment an impact force is applied. However, in the present invention, this buffer chamber 16
Since the movable cover 4 and the boss 4' forming one side are attached in the axial direction via the coil spring 6 at the fastening bolt 5 portion as described above, an impact force is applied to the head 11. The movable cover 4 is moved outward by the acting force propagated to the pressure of the instantaneous buffer chamber 16, and the pulling force acting on the operating rod 10 through the head is prevented from being reduced, so that the movable cover 4 can operate efficiently. .

When the target object has been extracted in this way, the main air supply valve operating lever 3
By releasing 4, the main air supply valve 30 closes and the reciprocating movement of the piston 13 is stopped. By removing the adapter 36 engaged with the latch 35, the object and the bolt inserted therein are removed. It is sufficient to remove B, direct the tool to another target location, and perform the pulling operation in the same manner as described above.

If the dimensions of the extraction bolt are different, for example, if the bolt dimensions are small as shown in FIG. You can use it like a standard bolt.

Of course, the hook may be replaced with one having a different key metal dimension.

Alternatively, in addition to the above-mentioned hooks, metal may be used for hooks with hooks for locking pieces with holes, or hooks with hooks may be used as necessary. You may choose to use gold.

What has been explained above is the operating mode of the function as a pull-out tool such as a dowel pin. However, when attaching the hook 35, use the side of the finder sleeve 45 and anvil 44 that protrude in the opposite direction to the part. In this case, the object to be driven, for example, the head of a pin, is pressed against the open end of the finder sleeve 45 against the spring 46, and the bundle 9 of the main body 1 and the head of the pin are pressed. By grasping the handle 3 and pulling the operating lever 34, the same action as when pulling out the lever causes the impact force acting on the head 11 of the operating rod 10 to cause the tip of the production operating rod 12 directly connected to the head to release the anvil 44 head. The driving operation can be performed by striking the part 44' and applying a striking force to the head of the target pin etc. by the anvil 44. At this time, even if the finder sleeve 45 comes into contact with the opposing surface etc. A protective ring 45'' is placed on the tip, so the intended purpose can be achieved without damaging it.

In addition, in the above embodiment, both the pulling and driving operations can be performed with one tool, but when the tool is used exclusively for the pulling operation, the anvil, finder sleeve, etc. can be removed. A blind cover may be attached to the recess of the movable side cover, or a cover body with a bundle may be attached.

Further, the movable cover may have no recess without providing the sub-operating rod.

Further, the structure of the switching air supply valve is not limited to the above embodiment, and similar effects can be obtained even if other types are used.

According to the present invention, it is possible to replace bolts that conventionally had to be manually pulled out with great effort by attaching an adapter to the head of a bolt that has been previously planted in the desired location. Depending on the shape of the object you are trying to pull out, a suitable hook is connected to the tip of the operating rod via a metal piece, and all you have to do is supply air and pull it lightly, and it will be attached to the operating rod. A powerful pulling impact force is applied to the target object, allowing it to be pulled out quickly.Moreover, this pulling force is efficiently applied to the operating rod, making it compact, powerful, and easily portable. It is an extremely effective pneumatic tool that can also be used as a percussion hammer if necessary.

Therefore, it is effective for use in factories and the like that require disassembly work that requires direct extraction.

[Brief explanation of the drawing]

The drawings show one embodiment of the tool of the present invention.
The figure is a longitudinal sectional view, Figure 2 is a view from I-II in Figure 1, Figure 3 is a cross-sectional view of the main parts of the fastening, Figure 4 is a cross-sectional view from IV-IV in Figure 1, and Figure 5 is an automatic FIG. 6 is a detailed view of the switching air supply valve mechanism, and FIG. 6 is a cross-sectional view of the adapter attachment section corresponding to different sizes of extraction bolts. 1...Main body, 2...Main part, 3...
...Fixed cover, 4...Movable cover, 5...
...Bolt, 6,46゜46'...Coil spring, 7...Cylinder, 10...Operating rod,
11...Head, 12...Sub-operating rod,
13... Free piston, 15... Air supply chamber, 16... Buffer chamber, 17, 18, 18',
18"...Connector L20...Automatic switching air supply valve mechanism, 21...Valve box, 22...
...Valve, 27...Primary exhaust chamber, 28.
...Secondary exhaust chamber, 30...Air supply valve, 35
...Holding is gold, 36...Adapter, 4
2...boss, 43...recess, 43',
43"... step section, 44... anvil,
45...Finder sleeve, 48...
...adjustment nut, B...bolt.

Claims (1)

[Claims] 1. An alternately operated automatic switching air supply valve mechanism is provided in the air supply passage leading from the main air supply valve to the cylinder in which the free piston is installed, and the automatic switching air supply valve mechanism In a pneumatic tool in which a piston reciprocates within a cylinder and applies an impact force to an operating rod inserted into the cylinder to perform a desired work, the tip of the operating rod that is inserted into the cylinder and is integrated with the head is It protrudes to the outside through the main body or a cover fixed to the main body, and a removable metal fitting for an auxiliary tool for pulling out an object, such as a pin, is fixed to the protruding end of the operating rod, and the other end of the cylinder is provided with a removable metal fitting for an auxiliary tool for pulling out an object, such as a pin. An impact-operated pneumatic tool, characterized in that a movable cover movably fitted is attached to the main body, and a recoil eliminating space is formed between the fitted end of the movable cover and the back surface of the operating rod head. 2. An alternately operated automatic switching air supply valve mechanism is installed in the air supply passage leading from the main air intake valve to the cylinder in which the free piston is installed, and the automatic switching air supply valve mechanism causes the free piston to reciprocate and close the cylinder. In a pneumatic tool that performs a desired work by applying an impact force to an operating rod inserted into the cylinder, the operating rod is inserted into the cylinder and has one end protruding to the outside through the main body or a cover fixed to the main body. A removable metal fitting for an auxiliary tool for pulling out an object, such as a pin, is attached to the protruding end of the cylinder, and a sub-operating rod of an appropriate length is provided on the same axis on the opposite side of the head that is integrated with the operating rod. A recoil eliminating space is formed between the fitting end of the movable cover attached to the main body and movably fitted in the axial direction at the end and the back surface of the operating rod head. A finder sleeve having an anvil of an appropriate length fitted inside the recess so that its dimensions can be adjusted in and out is provided, and the movable cover is passed through and inserted into the recess so that the tip of the sub-operating rod comes into contact with the anvil. An impact-operated pneumatic tool characterized by a protrusion.