JPH0372845B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention regulates the rotation of a driven shaft in both directions at all times, and releases the rotation restriction in a desired direction by a simple rotation operation of an operating member. The present invention relates to a locking mechanism that enables locking.

[Conventional technology]

For example, in vehicle seats, there is a need to adjust the movable headrest longitudinal position adjustment device, seat back reclining device, seat cushion vertical position adjustment device, and lumbar support rotation position adjustment device. To do this, an adjustment mechanism consisting of a rotation shaft and its displacement transmission means is generally employed. The problem with such an adjusting device is that the adjusting device works properly with a simple rotation operation, and the desired adjustment operation can be easily and reliably performed, and that the movable side can be adjusted at the adjusted position. What is needed is a locking mechanism that can restrict movement and maintain a complete lock against loads applied to the movable side.

[Problem to be solved by the invention]

However, the conventionally well-known locking mechanisms of this type have complicated structures and require troublesome assembly work.
Furthermore, there are other problems such as the inability to perform a smooth release operation with a small force, each of which has advantages and disadvantages, and it is desired to develop a simple locking mechanism that can satisfy all of the above requirements.

[Means to solve the problem]

In order to meet such demands, the lock mechanism according to the present invention is provided with a cylindrical stator, a cylindrical stator, a driven shaft, disposed within the stator, and each end facing close to the inner circumferential surface of the stator. A plate-shaped cam rotor having two pairs of cam surfaces forming two sets of wedge-shaped spaces opposite in the rotational direction between the inner circumferential surface of the stator on both side edge portions, and a plate-shaped cam rotor that bites into each of the wedge-shaped spaces. Two sets of lock pins are interposed in the same state to restrict rotation of the cam rotor in respective directions, and two sets of lock pins are interposed in a wedge-shaped space facing the same direction of rotation. A pair of pin plates supported on the driven shaft with the lock pins of each set being supported at both ends parallel to the driven shaft, and a wedge-shaped space in which each lock pin is interposed. The locking state of the cam rotor is released by resisting the urging force of the tension spring member and a locking pin that is rotatably supported coaxially with the cam rotor. This configuration includes an operation plate that moves the device in the direction in which it moves.

[Effect]

According to the present invention, by rotating the operation plate in either direction, the rotation of the cam rotor is restricted by any one of the sets of lock pins interposed in the wedge-shaped space facing the same direction of rotation. It is possible to release the locked state, and thereby the cam rotor can be rotated in the direction of releasing the lock. Of course, when the rotation operation on this operation plate is stopped, each lock pin bites into the wedge-shaped space formed by the cam surface of the cam rotor and the inner peripheral surface of the stator due to the biasing force of the tension spring member. It is possible to restore the locked state that restricts and restricts the rotation.

〔Example〕

Hereinafter, the present invention will be explained in detail using embodiments shown in the drawings.

1 to 4 show an embodiment of the locking mechanism according to the present invention, and only the main parts thereof are shown in an enlarged manner.

Now, the lock mechanism 1 according to the present invention has a general structure as follows. That is, this lock mechanism 1 includes a stator 2 having a cylindrical shape, and each end portion which is provided on a driven shaft 3, is disposed within the stator 2, and faces an inner circumferential surface 2a of the stator 2. Two pairs of cam surfaces 4a, 4b forming two sets of wedge-shaped spaces opposite to each other in the rotational direction between the side edge portions and the stator inner peripheral surface 2a;
Plate-shaped cam rotor 4 having 4a and 4b
and each cam surface 4a, 4b of this cam rotor 4;
two sets of lock pins 5a, which are interposed in wedge-shaped spaces between a and 4b and the inner circumferential surface 2a of the stator 2 to restrict rotation of the cam rotor 2 in respective directions; 5b;6
a, 6b. and lock pins 5a, 5b interposed within the wedge-shaped space described above;
Of the lock pins 5a, 6b of each pair, which are interposed in a wedge-shaped space facing the same direction of rotation, the driven shaft 3
Two pairs of pin plates 7, 8; 7, 8 are provided on the driven shaft 3 to support the shaft supports 11 at both ends of the corresponding lock pin in parallel to the shaft 3. . Further, cam surfaces 4a, 4b on both sides of each end of the cam rotor 4;
Lock pins 5a, 6b;
Between the ends of the pin plates 7 and 8 that pivotally support the lock pins 5a and 6b;
a tension spring member 9 that biases the springs so as to bite into the wedge-shaped spaces in which they are interposed;
a and 9b are provided so as to span over each other. Further, it is rotatably supported on the same axis as the cam rotor 4, and locks the cam rotor 4 by using any one of the lock pins 5a, 6a; 5b, 6b against the biasing force of the tension spring members 9a, 9b. An operation plate 10 is provided that moves the state in the direction of canceling the state.

Here, 11 in the figure is the above-mentioned lock pin 5a,
5b; Pivot supports protruding from both ends of 6a and 6b,
These are fitted into and supported by the holes 12 drilled on the two pairs of pin plates 7, 8; It is something that will be done. In addition, in this embodiment, these lock pins 5a, 5b; 6a, 6b
is supported from both ends by two pairs of pin plates 7, 8 disposed on both sides of the stator 2, so that reliable support can be obtained.

Furthermore, reference numeral 13 in the figure is provided in the operating plate 10, and the pivot supports 11 of the lock pins 5a, 5b; 6b
An arcuate guide groove 10a that can be rotated in the unlocking direction is the operating portion of the operating plate 10.

According to the above-described configuration, by rotating the operation plate 10 in either direction,
As shown by the imaginary lines in FIG. 3, it is possible to release the locked state that restricts the rotation of the cam rotor 4 by any one of the lock pins 5a, 6a or 5b, 6b, and thereby, as shown by the arrow in the figure. As shown, the cam rotor 4 can be rotated in the direction of releasing the restriction. Of course, when the rotation operation with respect to the operation plate 10 is stopped, each lock pin 5a, 5b;
b: It is inserted into the wedge-shaped space formed by 4a, 4b and the inner circumferential surface 2a of the stator 2 to restore the locked state that restricts and restricts its rotation.

In particular, according to the present invention, by pivotally supporting the lock pins 5a, 5b; 6a, 6b as engagers by two pairs of pin plates 7, 8; 6b is the driven shaft 3
The cam surfaces 4a, 4b on both ends of the cam rotor 4 are supported in parallel with the stator inner circumferential surface 2a and can be inserted into the wedge-shaped space formed by the stator inner circumferential surface 2a. As a result, problems such as malfunction due to the inclination of the lock pins 5a, 5b; 6a, 6b are eliminated, and the locking state and unlocking operation can be performed smoothly and appropriately, improving operational reliability. becomes possible. Moreover, the lock pin 5a mentioned above,
5b; 6a, 6b to pin plate 7, 8; 7, 8
Since the stator 2 is supported on the outside of the stator 2 and the tension spring members 9a and 9b are assembled on the outside thereof, there is an advantage that the assembly work can be performed extremely easily and appropriately.

Note that the present invention is not limited to the structure of the embodiment described above, and the shape, structure, etc. of each part may be modified and changed as necessary. For example, the tension spring members 9a, 9b may be hooked directly onto the pin plates 7, 8 instead of being engaged with the shaft supports 11 of the lock pins 5a, 6b; 5b, 6a as in the above-described embodiments. It is clear that similar effects can be achieved.

〔Effect of the invention〕

As explained above, according to the lock mechanism according to the present invention, the two pairs of cam surfaces formed on both side edges of both ends of the plate-shaped cam rotor provided on the driven shaft, and the inner circumferential surface of the stator that accommodates the two pairs of cam surfaces, Two sets of lock pins, which are interposed in two sets of wedge-shaped spaces formed between the cam rotor and opposite to each other in the rotation direction, and which restrict the rotation of the cam rotor in the respective directions, are arranged parallel to the driven shaft. The pin plate is supported on both ends of the pair of pin plates supported on the driven shaft, and is spanned between the ends of the pin plate that pivotally supports the lock pin interposed in the wedge-shaped space in opposite directions. an operating plate that moves any one of the lock pins in the direction of unlocking the cam rotor against the urging force of a tension spring member that urges the lock pins to bite into the wedge-shaped spaces in which the lock pins are interposed; Despite the simple configuration, it is possible to release the locked state in the desired direction and adjust the rotation of the driven shaft in the desired direction with a simple, smooth and light rotation operation. In addition, after adjustment, a stable and strong locking state can be obtained at the adjusted position, and the structure is simple and easy to assemble.
It has various excellent effects such as being inexpensive and being effective when used as a locking mechanism in various devices and devices.

[Brief explanation of drawings]

Fig. 1 is a schematic side view of the main parts showing an embodiment of the locking mechanism according to the present invention, Fig. 2 is a schematic exploded perspective view showing the main parts thereof, and Fig. 3 is a diagram explaining the principle of its characteristics. , FIG. 4 is a sectional view of the main part of FIG. 1. In the figure, 1... lock mechanism, 2... stator, 3... driven shaft, 4... cam rotor, 4a, 4b... cam surface,
5a, 5b; 6a, 6b...Lock pin, 7, 8...
Pin plate, 9a, 9b... tension spring member, 10... operation plate.

Claims (1)

[Claims] 1. A stator having a cylindrical shape, and a stator provided on a driven shaft and disposed within the stator, and having a space between the inner circumferential surface of the stator and the inner circumferential surface of the stator on both side edge portions of each end facing close to the inner circumferential surface of the stator. a plate-shaped cam rotor having two pairs of cam surfaces forming two pairs of wedge-shaped spaces that are oriented in opposite directions in the rotational direction; and a wedge-shaped space between each cam surface of the cam rotor and the inner circumferential surface of the stator. Of the two sets of lock pins that are inserted into the cam rotor and thereby restrict the rotation of the cam rotor in respective directions, and the two sets of lock pins that are interposed within the wedge-shaped spaces, the lock pins that rotate in the same direction At least one pair of lock pins of each set interposed in the wedge-shaped spaces facing each other are supported on the driven shaft in a state in which the lock pins of each set are pivotally supported at both ends of each pair so as to be parallel to the driven shaft. a pin plate, a tension spring member that urges the lock pins to bite into wedge-shaped spaces, and a tension spring member that is rotatably supported on the same axis as the cam rotor and that includes one of the lock pins. A locking mechanism comprising: an operation plate for moving the cam rotor in a direction to release the locking state of the cam rotor against the biasing force of the tension spring member.