JP2000234637A - Turn lock device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact turn lock device capable of surely locking a rotary member in an arbitrary turn position, smoothly and easily performing releasing operation, and coping with high load torque. SOLUTION: A cage part 4A of a roller retainer 4 fixed to a machine frame side is arranged between an operating shaft 2 formed with a cam surface S in a plurality of parts of a cylindrical external peripheral surface and an outer cylinder 5, and a roller holding hole for holding a roller rotatably and idle movably in a radial direction of the cage part is formed in a corresponding position to each cam surface in the cage part. The operating shaft is turnably energized in a reverse direction to a direction of load torque acting on the outer cylinder by an energizing member, the roller is interposed between the cam surface and an internal peripheral surface of the outer cylinder, and by friction, rotation of the outer cylinder is locked only in the load torque direction. The outer cylinder is unlocked by turning the operating shaft in the load torque direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation lock device for mechanically locking a rotating member at an arbitrary position.

[0002]

2. Description of the Related Art Conventionally, a rotary lock device used for mechanically locking a rotary member at an arbitrary position generally uses a ratchet mechanism. For example, Japanese Patent Application Laid-Open No. 7-215172 discloses a rotary lock device. As described in the gazette, it is incorporated in a passenger holding device of a vehicle such as a roller coaster installed in an amusement park.

[0003] The passenger holding device, as shown in FIG.
A pair of pivot arms A4, which are pivotally provided around a support shaft A3 located below the front of each seat A2 of the vehicle A1 traveling on the rail, and between the pivot ends of these pivot arms A4. It has a body holding bar A5 connected.

The rotating arm A4 is urged away from the body by a torsion coil spring (not shown), and its supporting shaft A3 has a ratchet mechanism as shown in FIG. Is provided with a rotation lock device A6.

The rotation lock device A6 has a ratchet A7 fixed to a support shaft A3 and a ratchet claw A9 for locking the ratchet A7 by the urging force of a coil spring A8, and the passenger sits on the seat A2. When the body holding bar A5 is tilted forward by the user against the urging force of the torsion coil spring at the position, the ratchet A7 rotates clockwise in FIG. 5 together with the rotating arm A4.

When the body pressing bar A5 is pressed against its own abdomen and then the body pressing bar A5 is released, the ratchet claw A9 locks the teeth of the ratchet A7 and the rotating arm A4.
And the body holding bar A5 are fixed at that position, and the passenger is prevented from swinging out during traveling of the vehicle A1.

When the vehicle A1 stops on the platform, the rotation lock device A6 is released by releasing the ratchet pawl A9 from the ratchet A7 via a cam plate (not shown), thereby releasing the rotation arm A4 and the body presser. The bar A5 jumps up by the biasing force of the torsion coil spring, and the body is released.

A rotation lock device using a ratchet mechanism has been conventionally used also for a reel for feeding a wire as shown in FIG. In FIG.
1 is a ratchet wheel B3 concentrically fixed to a side surface of a payout reel B2 around which a wire W is wound, a ratchet pawl B4 for locking the teeth of the ratchet wheel B3, and the ratchet pawl B4 is a ratchet wheel B3.
And a release cylinder B6 for releasing the ratchet claw B4 from the teeth of the ratchet wheel B3 against the urging force of the ratchet spring B5.

When the reel B2 is rotated in the direction of winding the wire W, the rotation lock device B1 slides the teeth of the ratchet wheel B3 on the tooth surface of the ratchet pawl B4 and is not locked. Can be rotated freely.

When the reel B2 stops,
The ratchet pawl B4 is engaged with the teeth of the ratchet wheel B3, and the rotation of the payout reel B2 in the payout direction of the wire W is prevented.

Here, when the wire W is paid out from the pay-out reel B2, the telescopic rod B7 of the release cylinder B6 is extended and the rear end thereof pushes the rear part of the ratchet claw B4 to support the pay-out reel B2. The ratchet wheel B3 is released by swinging the ratchet claw B4 around the support shaft B8 attached to the machine frame that is not provided, so that the rotation of the payout reel B2 becomes free, and the wire W can be fed.

[0012]

In the rotary lock device using the conventional ratchet mechanism as described above, the lock position of the rotary member can be locked at an arbitrary position at an interval smaller than the pitch interval of the ratchet teeth. However, there is a problem that backlash occurs, and there is a problem that collision noise is generated between the ratchet teeth when the ratchet teeth are slid and rotated with respect to the ratchet claw.

[0013] Further, since the load is concentrated on the meshing portion between the ratchet teeth and the ratchet pawl at the time of locking, strength is required for the ratchet teeth and ratchet pawls, and it has been difficult to make the rotary lock device compact.

Further, since a large force is required to release the ratchet pawl meshing therewith from the ratchet teeth receiving the load torque from the rotating member, there is a problem that the lock release cylinder and the like become large. Was.

Therefore, the present invention solves the above-mentioned problems of the prior art, does not generate noise during rotation, can reliably lock the rotating member at an arbitrary rotating position, and can smoothly and easily release the rotating member. It is an object of the present invention to provide a rotation lock device that can be performed, is compact, and can cope with a high load torque.

[0016]

In order to achieve the above object, a rotation lock device according to the present invention comprises an operation shaft having a cam surface formed at a plurality of locations on an outer peripheral surface, and one rotation shaft on each cam surface of the operation shaft. A plurality of rollers arranged one by one in parallel with the operation shaft and an axial direction, and each roller is rotatable at a plurality of positions in the circumferential direction by radially penetrating between the inner peripheral surface and the outer peripheral surface and in the radial direction. A plurality of roller holding holes for freely moving are formed,
A roller retainer fixed to the machine frame side having a cage portion on which an operation shaft is rotatably fitted on the inner peripheral surface; and a roller retainer which can abut on each roller and is rotatably fitted to the cage portion. An outer cylinder having a cylindrical inner peripheral surface concentric with the operation shaft, and a torque is applied to the operation shaft in a direction opposite to a direction in which rotation of the outer cylinder is locked with respect to the roller retainer. There is provided an urging member that maintains a state of being always held between the inner peripheral surface of the outer cylinder and the cam surface.

[0017]

When the load torque acts on the outer cylinder in a direction in which the rotation is locked, the rollers held in the roller holding holes of the roller retainer fixed to the machine frame side are in contact with the inner peripheral surface of the outer cylinder. The rotation of the outer cylinder is locked by the frictional force between the operation shaft and the cam surface.

Next, when the outer cylinder is rotated in the direction opposite to the direction in which the rotation is locked, the operating shaft is rotated by the urging member by the frictional force transmitted from the outer cylinder via the roller. The outer cylinder can rotate freely because it is slightly rotated and displaced in the direction opposite to the biasing direction, the radial distance between the inner peripheral surface of the outer cylinder, the cam surface, and the roller position is increased, and the roller is released. .

Further, the operation shaft is rotated against the torque applied by the urging member, so that the radial distance between the inner peripheral surface of the outer cylinder at the roller position and the cam surface of the operation shaft is larger than the roller diameter. Thereby, the outer cylinder is released and can freely rotate in any rotational direction.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing one embodiment of the rotation lock device of the present invention. And a biasing member (not shown) that rotationally biases the operation shaft 2, and is similar to the rotary lock device shown in FIG. In order to fix the position of the presser bar, the support shaft R of the rotating arm to which the body presser bar is attached
It is used by being connected to.

In the rotation lock device 1 of the present invention, the operating shaft 2 has an outer peripheral surface F of a central portion 2A in the axial direction formed in a cylindrical shape having a larger diameter than both end portions. As shown in FIG. 2, 5 flat cam surfaces S are equally spaced in the circumferential direction.
It is formed in several places.

On both axial sides of the central portion 2A, bearing fitting portions 2 each having a cylindrical outer peripheral surface having a smaller diameter.
B and 2C are concentrically connected, and these parts are rotatably supported by a roller retainer 4 described later via bearings 6 and 7.

Also, one bearing fitting portion 2B of the operating shaft 2
On the opposite side of the central portion 2A, a mounting shaft portion 2D having a smaller diameter than the bearing fitting portion 2B is continuously provided. Here, the base end portion of the lever-shaped unlocking operation portion 8 is provided with a fixing bolt 9 Is fastened and fixed.

The other bearing fitting portion 2C of the operating shaft 2
On the opposite side of the center portion 2A, a bearing fitting portion 2E slightly smaller in diameter than the bearing fitting portion 2C is provided concentrically, and the outer cylinder 5 is connected to this portion via bearings 10 and 11. It is rotatably supported.

On the other hand, the roller retainer 4 concentrically surrounds the periphery of the central portion 2A of the operating shaft 2 and has a hollow cylindrical shape in which outer rings of the bearings 6 and 7 are fitted on both inner peripheral surfaces thereof. It comprises a cage part 4A and a fixed part 4B connected to one end of the cage part 4A.

In this embodiment, the fixed portion 4B is substantially 3
It is formed in a flange shape having a rectangular outer peripheral profile,
It is fixed to the side wall at three places around a mounting hole h provided through the side wall of the machine frame H of the passenger holding device by a fastening member B.

On the other hand, as shown in FIG. 2, the cage portion 4A penetrates radially at positions respectively corresponding to five cam surfaces S formed on the central portion 2A of the operation shaft 2, and The roller holding holes 4C are formed in the roller holding holes 4C, and the rollers 3 are rotatable around their respective central axes and the cage portions 4 are formed in the roller holding holes 4C.
A is held so as to be displaceable in the radial direction of A.

The outer cylinder 5 has an inner peripheral surface 5A concentrically surrounding the cage portion 4A of the roller retainer 4,
The inner peripheral surface 5A is loosely and rotatably fitted on the outer peripheral surface of the cage portion 4A.

The outer rings of the bearings 10 and 11 described above are fitted and fixed to the inner peripheral surface 5B of a smaller diameter which is provided concentrically with the inner peripheral surface 5A.

Further, an outer peripheral portion of an end surface of the outer cylinder 5 opposed to a mounting surface of the fixing portion 4B of the roller retainer 4 to the machine frame H is provided for preventing entry of dust and the like into the outer cylinder 5. A sealing ring 12 is mounted.

On the other hand, a mounting flange 5C is provided on the outer periphery of the end of the outer cylinder 5 opposite to the side on which the sealing ring 12 is mounted.
Are formed integrally, and a mounting flange G provided on the support shaft R is connected and fixed to this portion by a plurality of fastening members b.

Although not shown, a telescopic rod end of an air cylinder device (not shown) for rotating the operation shaft 2 from outside is mounted in a mounting hole 8A formed near the end of the unlocking operation part 8. It is designed to be mounted on a shaft.

As shown in FIG. 2, the operating shaft 2 is always supported on the outer cylinder 5 by a biasing member (not shown) with respect to the roller retainer 4 fixed to the machine frame H. Load torque T acting from the R side.
Is urged to rotate.

Next, the operation of the rotation lock device 1 configured as described above will be described. (A) of FIG.
Is attached to the outer cylinder 5 of the rotation lock device 1 by the support shaft R (see FIG. 1).
When a load torque in the clockwise direction T is acting from the side,
This shows a state in which the rotation of the outer cylinder 5 is locked.

The operating shaft 2 is rotationally urged in the counterclockwise direction t in FIG. 4A by the urging member (not shown) described above, and the center of the roller holding hole 4C formed in the cage portion 4A. From the position, the center position N of the cam surface S of the operation shaft 2
Are displaced counterclockwise around the axis O of the operating shaft 2.

On the other hand, the radial gap between the inner peripheral surface 5A of the outer cylinder 5 and the cam surface S is slightly wider than the outer diameter of the roller 3 at the center position N in the rotation direction of the cam surface S. At both ends in the rotation direction of the surface S, the outer diameter of the roller 3 is set slightly smaller.

For this reason, as shown in FIG.
When the roller 3 is urged to rotate in the counterclockwise direction t, the outer peripheral surface of the roller 3 abuts on both the inner peripheral surface 5A of the outer cylinder 5 and the cam surface S.

When the outer cylinder 5 tries to rotate in the clockwise direction T due to the load torque, the friction between the inner peripheral surface 5A of the outer cylinder 5 and the outer peripheral surface of the roller 3 causes the roller 3 to rotate. 5 and slightly abuts on the front wall surface X in the clockwise direction T in the roller holding hole 4C of the cage portion 4A, where the movement is stopped.

The roller 3 itself tries to rotate clockwise by receiving the frictional force transmitted from the outer cylinder 5, but when the roller 3 rotates, the operating shaft 2 moves from the roller 3 to the cam surface S. Attempts to rotate in the counterclockwise direction t by receiving the frictional force, so that the radial gap between the inner peripheral surface 5A of the outer cylinder 5 and the cam surface S at the position of the roller 3 is further reduced. The rotation of the cylinder 5 in the clockwise direction T is locked to the cage portion 4A of the roller retainer 4 fixed to the machine frame H.

On the other hand, when the outer cylinder 5 is rotated in the direction opposite to the direction of action T of the load torque, that is, in the counterclockwise direction T ′ in FIG. Due to the friction with the roller, it slightly moves to the other wall surface Y side in the roller holding hole 4C and rotates counterclockwise.

As a result, the operating shaft 2 is slightly rotated clockwise by the frictional force acting on the cam surface S from the roller 3 against the urging force of the urging member, and the outer peripheral surface of the roller 3 and the cam surface S are displaced. The contact position P with the inner surface 5A of the outer cylinder 5 at the position of the roller 3 and the cam surface S
Is increased in the radial direction, and the outer peripheral surface of the roller 3 and the cam surface S
Alternatively, slippage occurs between the outer peripheral surface of the roller 3 and the inner peripheral surface 5A of the outer cylinder 5, and the outer cylinder 5 can freely rotate in the counterclockwise direction.

On the other hand, FIG.
Shows the unlocked state of the operating shaft 2
From the position shown in FIG. 2A to the center position N of the cam surface S in the clockwise direction t ′ against the urging force of the urging member (not shown).
The lock is released by rotating the roller 3 so that the contact position P between the outer peripheral surface of the roller 3 and the cam surface S comes.

As shown in FIG. 1, the operation shaft 2 is rotated by driving an unlocking operation section 8 fixed to the operation shaft 2 by an air cylinder (not shown).

In the state shown in FIG. 3B, the radial distance between the inner peripheral surface 5A of the outer cylinder 5 and the cam surface S at the position of the roller 3 is slightly larger than the diameter of the roller 3, and the outer cylinder 5 is The support shaft R shown in FIG. 1 can be rotated freely in both directions with respect to the retainer.

In the above-described embodiment, the cam surface S is formed by flattening the outer peripheral surface F of the axially central portion 2A of the operating shaft 2 in order to facilitate the manufacture of the operating shaft 2. However, the cam surface S is provided with the operation shaft 2 in the rotational biasing direction of the biasing member.
When the roller 3 is rotated, the facing distance between the inner peripheral surface of the outer cylinder and the cam surface S at the position of the roller 3 is narrowed so that the roller 3 has a contour that can hold the roller 3 therebetween.

In this embodiment, the operating shaft 2 is rotated by an air cylinder. However, the present invention is not limited to this. The operating shaft 2 may be rotated by an electromagnetic solenoid or other actuators, or may be rotated manually. The lock may be released by a moving operation.

Further, in this embodiment, the rotation lock device 1 is used for fixing the position of the body holding bar of the passenger holding device as shown in FIG. 4 described above, but is not limited to this. As in the example shown in FIG. 6 described above, a rotation lock device for preventing rotation of the wire reel in a direction in which the wire is unwound, a rotation lock device for preventing reverse rotation of a take-up drum of a winch or a hoist, or the like. The present invention can be widely applied as a device for locking a reverse rotation of a rotating member to which load torque is applied in one direction.

[0048]

As described above, according to the present invention, there is no backlash between the ratchet teeth and the ratchet pawl in the conventional rotation lock device using the ratchet mechanism, and the ratchet teeth and the ratchet pawl are not provided. In this way, a quiet operation can be performed without generating a collision noise generated between the members, and the rotating member can be reliably fixed at an arbitrary position.

Further, when releasing the lock of the outer cylinder, the operating shaft may be slightly rotated and displaced with a small releasing torque, and the unlocking operation can be performed without using an air cylinder having a large load capacity. It can be performed easily and smoothly.

Further, since the load torque acting on the outer cylinder from the rotating member is shared and received by the plurality of rollers, the load capacity is large, and this type of rotation lock device using a ratchet mechanism having the same load capacity can be used. In comparison, it can be made more compact, and it is easy to secure a mounting space.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a rotation lock device of the present invention.

FIG. 2 is a cross-sectional view taken in the direction of the arrow from the position of line AA in FIG.

3A and 3B are explanatory views of the operation of the rotation lock device of the present invention, wherein FIG. 3A shows a locked state, and FIG. 3B shows an unlocked state.

FIG. 4 is a side view of a vehicle provided with a passenger holding device, showing an example of use of a conventional rotation lock device.

FIG. 5 is a structural view of a main part of a rotation lock device incorporated in the passenger holding device shown in FIG. 4;

FIG. 6 shows another example of use of a conventional rotation lock device.
It is a schematic structure figure of a wire feed reel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotation lock device 2 Operation shaft 2A Central part 2B, 2C Bearing fitting part 2D Mounting shaft part 2E Bearing fitting part 3 Roller 4 Roller retainer 4A Cage part 4B Fixed part 4C Roller holding hole 5 Outer cylinder 5A, 5B Inner peripheral surface 5C Mounting flange 6, 7, 10, 11 Bearing 8 Unlocking operation part 9 Fixing bolt 12 Annular seal member S Cam surface

Claims (1)

[Claims] An operating shaft having a cam surface formed at a plurality of locations on an outer peripheral surface, and a plurality of operating shafts arranged on each cam surface of the operating shaft one by one in parallel with the operating shaft. A roller, and a plurality of roller holding holes which penetrate in a radial direction between an inner peripheral surface and an outer peripheral surface and hold each roller at a plurality of positions in a circumferential direction so as to be rotatable and freely movable in the radial direction. A roller retainer fixed to the machine frame side having a cage portion on which an operation shaft is rotatably fitted on a surface; and a roller retainer that can abut each roller and is rotatably fitted to the cage portion. An outer cylinder having a cylindrical inner peripheral surface concentric with the operation shaft; and applying a torque in a direction opposite to a direction in which rotation of the outer cylinder is locked to the roller retainer to the operation shaft, so that each roller is always an outer cylinder. A biasing member for maintaining a state of being held between the inner peripheral surface and the cam surface; Rotation lock device according to claim.