JP2005188566A - Cylinder with lock mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve easy maintenance such as component replacement while improving the durability of a lock mechanism. <P>SOLUTION: A flat protruded portion 24 is formed on a front end face 13a of a lock rod 13 to be slid integrally with a piston in a cylinder body, and a lock pin 26 having a flat face 26c is rotatably journaled to the flat protruded portion 24. On a lock piston 17 for a locking cylinder provided in the cylinder body, a wedge body 20 is provided with a slit 22 for receiving an inclined face 23 inclined to the axis thereof and the flat protruded portion 24. With the drive of the lock piston 17, the wedge body 20 puts the inclined face 23 in face contact with the flat face 26c of the lock pin 26 and enters between the lock pin 26 and the front end face 13a of the lock rod 13 while giving rotation to the lock pin 26, whereby the piston is locked together with the lock rod 13. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cylinder with a lock mechanism in which a piston of a fluid pressure cylinder such as a pneumatic cylinder can be locked by a lock cylinder attached to the cylinder body.

Conventionally, there is a cylinder described in the following technical document as such a cylinder with a lock mechanism.
<Technical Reference 1 (Microfilm of Japanese Utility Model Publication No. 57-110304)>
An enormous head is formed on the engaging member protruding from one side of the piston, and the conical tip of a pair of pin-like engaging members is engaged with the engaging part that is the base of this head Let the piston lock.

<Technical Document 2 (Microfilm No. 3-14305)>
The engagement member projecting on one side of the piston is formed with a Soroban bead-like engagement projection, which is an enormous head, and a pair of lock pins are inclined on the inclined lock pin engagement surface of the engagement projection. The piston is locked by engaging the engaging portion which is the distal end surface.

  However, the one in the technical document 1 and the one in the technical document 2 can only lock in one direction.

<Technical Reference 3 (Japanese Patent Publication No. 48-41191)>
The outer surface of the piston (main piston) is formed with an annular lock groove with a tapered surface on one side, and a tapered surface is formed on the top of the small diameter portion of the lock piston. The piston is moved against the sliding in both directions at the stroke end by engaging the taper surface at the top of the small diameter portion with the taper surface of the lock groove and engaging the opposite surfaces perpendicular to each other. It can be locked.

<Technical Reference 4 (Japanese Patent Laid-Open No. 2001-32803)>
A lock member is mounted in a lock cylinder provided in the cylinder body so as to be reciprocally movable in the radial direction of the piston rod. The lock member is engaged with a part of the outer peripheral surface of the piston rod. A concave portion which is a portion is provided, and a cylindrical shutter member is provided on the outer periphery thereof so as to be capable of reciprocating in the axial direction. The shutter member is provided with a through hole through which the lock member penetrates and a stopper surface that regulates the tip of the lock member. When the piston rod has moved to the stop position, the slope of the lock member engages with the slope of the engaging portion through the through hole, so that the one-way sliding of the piston rod is locked, and the vertical opposite of each other The sliding of the piston rod in the other direction can be locked by the engagement of the surfaces.

  However, although the thing of the technical document 3 can lock in both directions, the lock groove | channel which becomes a taper surface in which one side inclined in the piston itself must be formed cyclically | annularly.

  Although the thing of the technical document 4 can also lock in both directions, a cylindrical shutter member must be attached to the outer periphery of a piston rod provided with a concave portion as an engaging portion so as to be capable of reciprocating in the axial direction. Is complicated.

<Technical Reference 5 (JP 2000-176874 A)>
Since the technology described therein is put into practical use as a product having a structure as shown in FIGS. 1 to 4, when described with reference to these drawings, the inside of the cylinder body 50 of the clamping cylinder slides. A piston rod 52 is fixed to the front surface of the piston 51 and a lock rod 53 is fixed to the rear surface of the piston 51 so that the piston 51 is sandwiched between these rods. These rods move together with the piston 51. A clamp arm 54 is pin-connected to the piston rod 52 so as to constitute a toggle mechanism, and the clamp arm 54 is opened and closed as is conventionally known by reciprocating sliding of the piston 51.

  The head cover 55 of the cylinder main body 50 incorporates a lock cylinder 56 having this as a main body. The lock cylinder 56 has a built-in lock piston 57 whose axis is perpendicular to the axis of the cylinder body 50 (axis of the lock rod 53) and reciprocally slides in a direction perpendicular to the axis of the lock rod 53. . The lock piston 57 is urged toward the lock rod 53 by a lock spring 59 that uses a cover 58 of the lock cylinder 56 as a spring receiver. A cylindrical lock protrusion 60 projects from the lock piston 57, and the tip 60a of the lock protrusion 60 has a truncated cone shape as shown in FIG.

  On the other hand, the lock rod 53 is formed with a lock recess 61 lacking in a trapezoidal shape, and both side surfaces of the lock recess 61 are flat inclined surfaces 61a.

  In such a conventional structure, when the piston 51 retracts to the point where the clamp arm 54 clamps the workpiece (not shown), the lock protrusion 60 is driven toward the lock rod 53 by the biasing force of the lock spring 59. When the frustoconical tip 60a of the lock protrusion 60 enters the lock recess 61 of the lock rod 53 as shown in FIGS. 1 and 2, the lock rod 53 is locked, and the piston 51 is also locked. .

However, this has the following problems.
(1) Since the front end portion 60a of the lock protrusion 60 has a truncated cone shape, both side surfaces of the lock recess 61 of the lock rod 53 are flat inclined surfaces 61a. Even if the inclined surface 61a of the lock recess 61 is machined at the same angle, these are in line contact at the time of locking, and if the machining angle is misaligned, point contact will occur as shown in FIG. Wear and deformation are likely to occur.
(2) During maintenance such as replacement of parts, for example, when the lock rod 53 is replaced, the directionality with the piston rod 52 is not suitable, so it is necessary to replace the piston rod 52, piston 51 and lock rod 53 with an assembled product. Become.
Japanese Utility Model No.57-110304 microfilm Japanese Utility Model No. 3-14305 microfilm Japanese Patent Publication No. 48-41191 JP 2001-32803 A JP 2000-176874 A

  An object of the present invention is to solve the above-described problems, to improve the durability of the lock mechanism, and to provide a two-way lock type cylinder with a lock mechanism that can easily perform maintenance such as component replacement.

  In the cylinder with a lock mechanism according to the present invention, a flat protrusion is formed on the tip surface of the lock rod that slides integrally with the piston in the cylinder body, and a lock pin having a flat surface is freely rotatable on the flat protrusion. The lock piston of the locking cylinder provided on the cylinder body is provided with a wedge body having an inclined surface inclined with respect to the axis and a slit for receiving the flat protrusion of the lock rod. The wedge body has a structure in which the piston is locked by bringing the inclined surface into surface contact with the flat surface of the lock pin and rotating between the lock pin and the distal end surface of the lock rod while rotating the lock pin.

The preferable form is as follows.
The lock pin is supported by the lock rod so as to pass through the flat protrusion of the lock rod, the flat surface of the lock pin is formed on both sides of the flat protrusion of the lock rod, and the inclined surface of the wedge body is the slit. It is formed on both sides.

The wedge body is cylindrical and also serves as a piston rod for the lock piston.
The lock cylinder urges the lock piston with a lock spring to slidably fit the slit of the wedge body with the flat protrusion of the lock rod, and slides the lock piston against the lock spring. The fluid pressure to be flowed in flows through the flow path branched from the fluid pressure port of the cylinder body.

  When the lock piston reaches the stroke end due to the fluid pressure, the wedge body is in an unlocked state in which the lock rod and the lock pin are allowed to move together while the slit is fitted to the flat protrusion of the lock rod.

  In the present invention, the wedge body provided on the lock piston causes the inclined surface to come into surface contact with the flat surface of the lock pin, rotates the lock pin, and increases the contact area between the lock pin and the tip surface of the lock rod. Since it is locked in between, wear and deformation are much less than in the prior art, resulting in a highly durable lock mechanism. Further, since only the lock pin needs to be replaced, maintenance is easy and economical.

  If the surface contact between the inclined surface of the wedge body and the flat surface of the lock pin is performed on both sides of the flat protrusion of the lock rod, it can be rotated smoothly without applying an uneven load to the lock pin. it can.

  If the wedge body has a cylindrical shape that also serves as the piston rod of the lock piston, it is easy to integrally form the lock piston and the wedge body.

  If the slit of the wedge body is slidably fitted to the flat protrusion of the lock rod, and the lock piston is slid against the lock spring by the fluid pressure from the fluid pressure port of the cylinder body, the lock and It can be released with a simple structure.

  If the slit of the wedge body remains fitted to the flat protrusion of the lock rod even when unlocking, the rotation of the lock piston and wedge body can be restricted, and the lock and its release can be controlled with a short stroke of the lock piston. Can be done stably.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 5 shows an entire embodiment of the present invention. This embodiment is applied to a clamping cylinder in the same manner as the conventional example shown in FIG. 1, and the clamping cylinder itself is a piston that slides in the cylinder body 10 as in the conventional example of FIG. A piston rod 12 is fixed to the front surface of 11 and a lock rod 13 is fixed to the rear surface so that the piston 11 is sandwiched between these rods, and these rods move together with the piston 11. A clamp arm 14 is pin-connected to the piston rod 12 so as to constitute a toggle mechanism, and the clamp arm 14 opens and closes by reciprocating sliding of the piston 11.

  The head cover 15 of the cylinder body 10 incorporates a lock cylinder 16 having this as a main body, as shown in cross section in FIGS. 5 and 6. The locking cylinder 16 has a built-in lock piston 17 whose axis is perpendicular to the axis of the cylinder body 10 (axis of the lock rod 13) and reciprocally slides in a direction perpendicular to the axis of the lock rod 13. Yes. The lock piston 17 is urged toward the lock rod 13 by a coil-shaped lock spring 19 using a cover 18 of the lock cylinder 16 as a spring receiver.

  As shown in FIGS. 7 (A), 7 (B), 7 (C) and 8, the lock piston 17 is formed by integrally forming a cylindrical wedge body 20 that also serves as the piston rod from a metal, and a lock spring 19. A circular spring receiving recess 21 is formed to receive a portion of the.

  In the wedge body 20, slits (slits) 22 opened on both sides of the outer peripheral surface thereof are formed to extend straight from the center of the front end surface (lower end surface) 20a of the wedge body 20 to the lock piston 17 side. The part that has been made is bifurcated. In addition, on the outer peripheral surface of the wedge body 20, the wedge body 20 is cut obliquely to the tip end surface (lower end surface) 20a, thereby forming inclined surfaces 23 inclined with respect to the axis on both sides of one opening of the slit 22. Has been.

  On the other hand, the lock rod 13 extends to the rod receiving chamber 15a provided in the head cover 15 as shown in FIG. 5, and a front end surface (rear end surface) 13a entering the rod receiving chamber 15a is shown in FIG. Thus, a flat tenon-like flat protrusion 24 is formed so as to project integrally, and both side surfaces thereof are flat vertical surfaces. A bearing hole 25 is provided in the flat protrusion 24, and a lock pin 26 is rotatably supported in the bearing hole 25 via a bush 27.

  9 to 12 show the shape of the lock pin 26. The lock pin 26 is integrally formed of metal and is hardened to increase hardness. A wedge body receiving portion 26b having a semicircular cross section is integrally formed on both sides of a central shaft portion 26a having a circular cross section. . The upper surfaces of the wedge body receiving portions 26b are flat surfaces 26c. A bush 27 is fitted to the central shaft portion 26a. Then, by fitting the central shaft portion 26a into the bearing hole 25 of the flat protrusion 24 of the lock rod 13 via the bush 27, the lock pin 26 is rotatably supported by the flat protrusion 24 and both sides thereof are supported. The wedge receiving portion 26 b protrudes from both side surfaces of the flat protrusion 24.

  The lock piston 17 urged by the lock spring 19 as described above is fitted to the flat protrusion 24 of the lock rod 13 so that the slit 22 of the wedge body 20 is always slidable. Is always prevented by the flat protrusion 24. Then, the forward and backward movement of the lock rod 13 by the sliding of the piston 11 is performed in this state.

  In the lock cylinder 16, fluid pressure (air pressure), that is, fluid pressure when the piston 11 is advanced is introduced through a flow path 28 branched from a fluid pressure port 10 a provided in the cylinder body 10. The lock piston 17 is slid against the lock spring 19 by the fluid pressure.

Next, the operation of this embodiment configured as described above will be described.
FIG. 13 is a perspective view of the unlocked state, FIG. 14 is a perspective view of the locked state, and FIGS.

  When fluid pressure is supplied to the port 10a in order to advance the piston 11, the lock piston 17 slides to the stroke end against the lock spring 19 as shown in FIG. Is done. As a result, the front end surface (lower end surface) 20a of the wedge body 20 is positioned on the flat surface 26c of the wedge body receiving portion 26b on both sides of the lock pin 26 as shown in FIG. It remains fitted with the flat protrusion 24 of the rod 13. Therefore, the movement of the lock rod 13 is allowed and the piston 11 moves forward.

  When the piston 11 is retracted by the fluid pressure opposite to the above, and the lock rod 13 and the lock pin 26 are retracted integrally with the piston 11 and the fluid pressure from the port 10a acting on the lock piston 17 disappears, Since the lock piston 17 is propelled (lowered) by the lock spring 19, the wedge body 20 is lowered while the slit 22 is fitted to the flat protrusion 24 of the lock rod 13, and the distal end surface 20a is located on both sides. It progresses toward the flat surface 26c of the wedge receiving part 26b. As a result, the lock pin 26 is rotated, but the wedge body 22 is further lowered, so that the inclined surfaces 23 on both sides of the wedge body 22 and the flat surfaces 26c of the wedge body receiving portions 26 on both sides are surfaces as shown in FIG. The wedge body 22 is further lowered as shown in FIG. 17 while being in contact with each other and in sliding contact with each other.

  When the piston 11 is retracted to the end, the lock piston 17 is also slid to the stroke end by the lock spring 19, so that the wedge body 20 has its inclined surface 23 wedged as shown in FIGS. It enters between the lock pin 26 and the front end surface (rear end surface) 13 a of the lock rod 13 while being in surface contact with the flat surface 26 c of the body receiving portion 26, and this state is held by the lock spring 19.

  Therefore, the movement of the lock rod 13 in both directions is locked by the wedge body 22. As a result, the piston 11 and the piston rod 12 are also automatically locked, so that the clamp arm 14 keeps the workpiece gripped.

  The lock release can be automatically performed by sliding the lock piston 17 against the lock spring 19 by the fluid pressure from the port 10a to obtain the state shown in FIGS.

  Although the above embodiment is applied to a clamping cylinder, the present invention is not limited to this and can be widely applied to various fluid pressure cylinders.

It is sectional drawing of a prior art example. FIG. It is a disassembled perspective view which shows the relationship between the lock protrusion of a lock piston in that, and the lock | rock recessed part of a lock rod. It is a figure which shows these contact states. It is sectional drawing of the whole of one Example of this invention. It is sectional drawing of the direction different from FIG. 5 of the principal part. The lock piston in it is shown, (A) and (B) are sectional drawings of a different direction, (C) is a bottom view. It is a disassembled perspective view of a lock piston and a lock rod. It is a top view of a lock pin. It is also a front view. It is also an end view. It is a perspective view similarly. It is a perspective view in the lock release state of a lock piston and a lock rod. It is a perspective view in a locked state similarly. It is sectional drawing in a lock release state. FIG. 16 is a cross-sectional view of the process of going from the unlocked state to the locked state in FIG. 15. It is similar sectional drawing. It is sectional drawing in a locked state.

Explanation of symbols

10 Cylinder body 10a Port 11 Piston 12 Piston rod 13 Lock rod 13a Front end surface (rear end surface)
14 Clamp arm 15 Head cover 15a Rod receiving chamber 16 Locking cylinder 17 Lock piston 18 Cover 19 Locking spring 20 Wedge body 20a Front end surface (lower end surface)
21 Spring receiving recess 22 Slit 23 Inclined surface 24 Flat protrusion 25 Bearing hole 26 Lock pin 26a Central shaft portion 26b Wedge body receiving portion 26c Flat surface 27 Bush 28 Flow path

Claims (5)

  A flat projection is formed on the tip of the lock rod that slides integrally with the piston in the cylinder body, and a lock pin having a flat surface is rotatably supported by the flat projection and is provided on the cylinder body. The lock piston of the locking cylinder is provided with a wedge body having an inclined surface inclined with respect to its axis and a slit for receiving the flat protrusion, and the wedge body locks the inclined surface by the propulsion of the lock piston. A cylinder with a lock mechanism, wherein the piston is locked by entering between the lock pin and the tip end surface of the lock rod while rotating the lock pin while being in surface contact with the flat surface.   The lock pin is supported by the lock rod so as to pass through the flat protrusion of the lock rod, the flat surface of the lock pin is formed on both sides of the flat protrusion of the lock rod, and the inclined surface of the wedge body is the slit. The cylinder with a lock mechanism according to claim 1, wherein the cylinder is provided on both sides.   The cylinder with a lock mechanism according to claim 1 or 2, wherein the wedge body has a cylindrical shape and serves also as a piston rod of the lock piston.   The lock cylinder urges the lock piston with a lock spring to slidably fit the slit of the wedge body with the flat protrusion of the lock rod, and slides the lock piston against the lock spring. The cylinder with a lock mechanism according to claim 1, 2, or 3, wherein the fluid pressure to be flown flows through a flow path branched from a fluid pressure port of the cylinder body.   When the lock piston reaches the stroke end due to fluid pressure, the wedge body is in an unlocked state allowing the lock rod and the lock pin to move together with the slit fitted to the flat protrusion of the lock rod. The cylinder with a lock mechanism according to claim 4.

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