JPH0239055Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rotation mechanism capable of locking a rotor having a rotation function at a predetermined rotation position.
The rotation mechanism of the present invention can be used, for example, to lock the antenna in two positions, horizontal and vertical, when used in a car-mounted antenna, and can also be used, for example, in a speaker part of a car-mounted audio device. In some cases, it can be used to lock the speaker in an upright position or a lying position.

[Conventional technology]

FIG. 5 is a diagram showing a conventional rotation mechanism. In FIG. 5, 51 is a fixed shaft, and 52 is a fixed shaft 51.
53 is a rotor rotatably fitted to the fixed shaft 51; 54 is a spring that presses the rotor 53 in the direction of the cylindrical body 52; 55 is a fixed shaft 51;
56 is a protrusion, 57 is a click function spring inserted into a hole drilled in the rotor 53, and 58 is a click that is pressed in the direction of the cylindrical body portion 52 by the spring 57. It is a ball for The cylindrical body portion 52 is provided with a hole (not shown) into which a ball 58 is fitted at a predetermined rotational position of the rotor 53.

In the mechanism shown in FIG. 5, a bias is applied by the pressing force of the spring 54 to create a drag between the cylindrical body portion 52 and the rotor 53, and this drag provides a frictional damper function. A click function for locking the rotor 53 at a predetermined rotational position is obtained by engaging the ball 58 incorporated in the rotor 53 with the hole in the cylindrical body part 52 by the pressing force of the spring 57.

[Problem that the invention attempts to solve]

With conventional rotation mechanisms, it is difficult to obtain an effective friction force to hold the rotor in a predetermined rotational position, and if a large force is applied to the rotor in the direction of rotating it, for example, if a heavy object In such a case, the rotor cannot be locked at a predetermined rotational position, and in order to prevent this, a spring 54 with a large spring force is required. In addition, the conventional type has a large number of parts, takes time to assemble, and increases costs. Furthermore, if there is play between the rotor and the fixed shaft passing through it, the rotor will wobble, which is inconvenient.

[Means for solving problems]

In order to solve the above-mentioned problems, the rotational positioning mechanism of the present invention includes a fixed shaft in which a conical part is coaxially provided, a through hole through which the fixed shaft passes, and a through hole in which the conical part is provided on the inner surface of the fixed shaft. The rotor includes a rotor having a conical surface that fits into the rotor, and a pressing means for pressing the rotating shaft toward the conical portion. A cutout groove is formed on the outer surface of the conical portion, and a first locking portion is formed at the bottom of the cutout groove. The rotor has at least two notches made in the conical surface portion from the end thereof to form claw portions having spring properties in the axial direction. The claw portion is provided with a second locking portion that locks with the first locking portion.

[Effect]

Since the conical part of the fixed shaft and the conical surface of the rotor fit together, a large friction force can be obtained and the wobbling of the rotor can be eliminated. The rotor can be reliably locked by the locking portion of the claw portion and the locking portion of the cone portion.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. Fig. 1 is a cross-sectional view of a rotating mechanism as an embodiment of the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig. 3 is an exploded perspective view of the main parts of the embodiment. It is a diagram.

A conical body 11 is provided on the fixed shaft 1 by integral molding or by fixing the conical body 11 so that both axes thereof are the same.
A notched groove 12 is formed in the conical body 11 along the axial direction, and a convex portion 13 for clicking is formed at the center of the bottom of the notched groove 12.

The rotor 2 has a cylindrical shape so that it can be fitted into the fixed shaft 1, and a conical surface 21 that fits closely with the conical body 11 is formed on the inner surface of one end. Rotor 2
Two notches 22 are made from the end, thereby forming claw portions 23. Claw portion 23
As shown in FIG. 2, the inner surface of the conical surface 21 protrudes further toward the axis than the inner diameter of the conical surface 21, and has a concave portion 24 at its tip that engages with the convex portion 13 of the conical body 11.
is formed. The rotor 2 is made of an elastic material such as resin, and therefore the claw portions 23 have spring properties in the radial direction of the rotor 2.

The rotor 2 is pressed toward the cone 11 by the friction damper spring 3 so that the conical surface 21 and the cone 11 are closely fitted. The other end of the spring 3 is stopped by a stopper 14 fixed to the fixed shaft 1.

The operation of the mechanism of the above embodiment will be explained. Rotor 2
is rotatable within the range of rotation angle θ shown in FIG.
At the center position of the rotation angle θ, the convex portion 13 and the concave portion 24 are coupled by the spring force of the claw portion 23, and the rotor 2 can be firmly stopped at that position. In this way, the convex portion 13 and the concave portion 24 provide a click function.

Since the conical body 11 is tapered and fits into the conical surface 21 of the rotor 2, the drag force as a component of the pressing force of the spring 3 (component of force perpendicular to the surface) is small against a small spring force. Therefore, the friction force can be increased, and an effective friction damper function can be realized.

Further, since the cone body 11 and the conical surface 21 are fitted together, the axis of the cone body 11, that is, the axis of the fixed shaft 1, and the axis of the conical surface 21, that is, the axis of the rotor 2 can be easily aligned. possible, rotor 2
This prevents it from wobbling.

Various modifications are possible in implementing the present invention. For example, the number of protrusions provided on the cone is not limited to one, but if the number is two or more, it becomes possible to click the rotor to a plurality of rotational positions. Furthermore, the shapes of the recessed portion of the claw portion and the convex portion of the conical body that perform the click function are not limited to those in the embodiment, and may be formed into various shapes that lock each other.

FIG. 4 is a diagram showing an example of application of the rotational position stop mechanism of the present invention. A speaker 4 is fixed to the rotor 2, and the speaker can be stood up or laid down in the direction of the arrow in the figure.

[Effect of idea]

According to the present invention, it is possible to reduce the number of parts of the rotating mechanism, thereby reducing costs, simplifying assembly work, and improving workability. Furthermore, even if the spring force of the friction damper spring is small, a large drag force can be generated on the contact surface of the rotor, so a sufficient friction damper function can be achieved. Furthermore, since the axes of the rotor and the fixed shaft can be aligned by fitting the conical body and the conical surface, wobbling of the rotor can be eliminated.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a rotation mechanism as an embodiment of the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. 3 is an exploded perspective view of the embodiment in FIG. FIG. 4 is a diagram showing an application example of the rotation mechanism of the present invention, and FIG. 5 is a diagram showing a conventional rotation mechanism. DESCRIPTION OF SYMBOLS 1... Fixed shaft, 2... Rotor, 11... Cone, 12... Notch groove, 13... Convex part, 21...
Conical surface, 22...notch, 23...claw portion, 24
...Concavity.

Claims (1)

[Scope of utility model registration request] A rotor having a fixed shaft in which a conical part is coaxially provided, a through hole through which the fixed shaft passes, and a conical surface that fits with the conical part is formed on the inner surface of the through hole; The rotor is provided with a pressing means for pressing the rotor in the direction of the conical part, and the outer surface of the conical part is formed with a notched groove in which a first locking part is formed at the bottom thereof, and the rotor has an end. At least two cuts made from the part to the conical surface part form a claw part having spring properties in the axial direction,
A rotation mechanism in which the claw portion is provided with a second locking portion that locks with the first locking portion.