JP2787597B2 - Shaft locking device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an axis lock device for holding a panel display at an arbitrary angle in an electronic device such as a word processor or a personal computer.

[Prior art and its solution] There are some methods for adjusting the angle of a panel display or the like using a ratchet mechanism or a cam mechanism. However, these are stepwise, cannot be finely adjusted, and have a complicated structure. There was a problem. The shaft lock device adjusts the angle by using the friction torque of the coil spring, and is superior to the above mechanism in that it can perform stepless fine adjustment and has a simple structure. Has applied for a shaft lock device.

However, all of the conventional shaft lock devices adjust the angle using the lock torque of the coil spring.
This is a one-way lock that locks the rotation of the coil spring only in the winding direction.

The present invention has been made based on a new finding of bidirectional locking of a rotating body in both forward and reverse directions, and an object thereof is to provide a shaft locking device that has good operability and can perform smooth operation. And

[Means for Solving the Problems] The present invention provides a fixed body on the fixed side, a rotating body to which the rotational force of the external members is transmitted, and a fixed body and a rotating body provided between the fixed body and the rotating body. A coil whose rotation direction is opposite between the fixed body and the movable body and between the movable body and the rotating body, while the movable body rotatable with respect to the body has a mutual insertion structure on the same axis. It is characterized in that the spring is extrapolated so as to be in close contact.

[Operation] In the above configuration, the forward / reverse rotation of the rotating body is performed by an external force exceeding the slip torque generated in any of the coil springs, and the rotation of the rotating body is locked by the slip torque by releasing the external force. .

Embodiment FIGS. 1 to 4 show an embodiment of the present invention. The fixed body 1 and the movable body 3 are formed in a cylindrical shape, and the shaft 6 is inserted through the fixed body 1 and the movable body 3. The insertion end of the shaft 6 is inserted into the cylindrical portion 21 of the rotating body 2, and the fixed body 1, the movable body 3 and the rotating body 2 are rotatable with respect to the shaft 6. This shaft 6
Supports the fixed body 1, the movable body 3 and the rotating body 2, and has a threaded portion 61 formed on the insertion end face thereof for attachment to an external member (for example, a panel display). In FIGS. 1 and 5, reference numeral 7 denotes an E-ring for preventing the inserted shaft 6 from coming off. The cylindrical portion 31 of the movable body 3, the cylindrical portion 11 of the fixed body 1, and the cylindrical portion 21 of the rotating body 2 have the same outer diameter, and the first and second coil springs 4, 5 are extrapolated to these. Have been. First coil spring 4
Is extended over the cylindrical portion 11 of the fixed body 1 and the cylindrical portion 31 of the movable body 3, and the second coil spring 5 is stretched over the cylindrical portion 21 of the rotating body 2 and the cylindrical portion 31 of the movable body. The coil springs 4 and 5 are wound so that the winding directions are opposite to each other. The coil springs 4 and 5 have a coil inner diameter of the cylinder 11 of the fixed body 1 and the cylinder 31 of the movable body 3.
And the outer diameter of the cylindrical portion 21 of the rotating body 2 is smaller than the outer diameter of the cylindrical portion 21. After being extrapolated into these, they are in close contact with their outer surfaces. Both ends of the coil springs 4 and 5 are free ends.

Such an axis lock device is mounted on a pivotal part of a panel display (not shown) to adjust the angle of the panel display, and the fixed body 1 is a body (not shown) that supports the panel display in a tiltable manner. ), While the rotating body 2 is connected to the panel display.
For this reason, engaging pieces 12 and 22 are formed on the outer ends of the fixed body 1 and the rotating body 2 for coupling with them. In the center of the cylindrical portion 31 of the movable body 3, a spacer portion 33 is projected in a ring shape, and the first and second coil springs 4,
5 mutual interference is prevented.

 Next, the operation of the above embodiment will be described.

When the rotating body 2 is rotated in the direction of arrow A (see FIG. 4) by operating the panel display in a state where the fixed body 1 is fixed and the rotating body 2 is connected to an external rotating member such as a panel display, Since the same direction is the direction of tightening the second coil spring 5 and the diameter of the second coil spring 5 is reduced, a lock torque is generated between the coil spring 5 and the rotating body 2 and the movable body 3, The rotating body 2 and the movable body 3 are connected by the same coil spring 5 and rotate integrally. This rotation is transmitted to the first coil spring 4 via the movable body 3, and the direction of rotation is the direction in which the coil spring 4 is rewound, and the direction in which the diameter of the coil spring 4 is increased. A slip torque is generated between the movable body 3 and the movable body 3. The panel display can be smoothly rotated in the direction A by an external force exceeding the slip torque.

On the other hand, when the rotating body 2 is rotated in the direction of arrow B (see FIG. 4), the direction becomes the direction in which the first coil spring 4 is tightened, and the diameter of the first coil spring 4 is reduced. Spring 4
, A lock torque is generated between the fixed body 1 and the movable body 3,
The fixed body 1 and the movable body 3 are connected by the same coil spring 4, and the rotation of the movable body 3 is locked. However, the direction of rotation is the direction in which the second coil spring 5 is rewound and the direction in which the diameter of the coil spring 5 is increased, and a slip torque is generated between the coil spring 5 and the movable body 3. Thus, the panel display can be rotated in the B direction by an external force exceeding the slip torque.

When the panel display is positioned at a desired angle by rotating the panel display in the A or B direction in this way, and when the external force on the display is released at this position, the display rotates in the A direction and is movable with the first coil spring 4. The rotation in the direction B is locked by the slip torque generated between the second coil spring 5 and the movable body 3 and can be maintained at a desired angle.

In the above operation, since the rotating body 1, the movable body 3 and the rotating body 2 are rotatably supported by the shaft 6 which is commonly inserted, a stable operation with small eccentricity and inclination is obtained. Can be.

The present invention is not limited to the above embodiments, and may be any structure in which a fixed body, a movable body, and a rotating body are inserted into each other. It is also possible to adopt a structure in which the fixed body and the rotating body are rotatably supported.

[Effects of the Invention] As described above, the present invention has a structure in which a fixed body, a rotating body, and a movable body are inserted into each other, and a coil spring having an opposite winding direction is extrapolated to these, so that any one of the coil springs slips. There is an effect that the rotating body can be bidirectionally locked in both the forward and reverse directions by the torque, and the eccentricity and inclination are small and stable operation can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along the line II of FIG. 2 of the embodiment of the present invention.
FIGS. 3, 3, 4 and 5 are a front view, a plan view, a right side view and a left side view, respectively. 1 ... fixed body, 2 ... rotating body, 3 ... movable body, 4,5 ...
Coil spring.

Claims (1)

(57) [Claims] 1. A fixed body serving as a fixed side, a rotating body to which a rotational force of external members is transmitted, and a movable body provided between the fixed body and the rotating body and rotatable with respect to the fixed body and the rotating body. The body and the body are coaxial with each other, and the coil springs with opposite winding directions are tightly inserted between the fixed body and the movable body and between the movable body and the rotating body. A shaft lock device, characterized in that it is made.