JPH0714065U - Friction hinge - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a friction hinge that supports a rotating shaft in a state where a frictional force is applied to the rotating shaft and resistance is given to the rotating shaft. A rotating shaft 5, coil springs 1 and 2 having an inner diameter smaller than an outer diameter of the rotating shaft 5 and closely fitted to the outer side of the rotating shaft 5, and the coil spring. At both ends of the coil spring, the supporting member 3 for rotatably supporting the rotating shaft 5 and the outside of the coil spring are brought into contact with each other to prevent the deformation of the coils at both ends of the coil spring due to the rotation of the rotating shaft 5. And a cover member (6). [Effect] When slip torque is applied to the rotary shaft of the friction hinge as in the conventional coil spring, torque drop and breakage of the coil end due to deformation of the shape of both ends of the coil spring are eliminated, and the number of durability cycles is greatly increased. Can be improved to
A large torque can be generated by reducing the outer diameter of the hinge.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a friction hinge that applies a frictional force to a rotating shaft and supports the rotating shaft in a state where resistance is given to the rotating shaft.

[0002]

[Prior art]

 An example of a friction hinge that is conventionally used as a friction hinge that supports a rotating shaft with resistance to rotation so that a display such as a personal computer can be stopped at an arbitrary angle. Will be described with reference to FIGS. 14 and 15. FIG. 14 is a front view of an example of a friction hinge (see Japanese Utility Model Laid-Open No. 5-3561), in which a rotating shaft 11 is rotatably attached to a supporting member 10, and the rotating shaft 11 has a rotating shaft. A coil spring 9 having an inner diameter smaller than the outer diameter of 11 is closely packaged. Both ends 9a and 9b of the coil spring 9 are engaged with and retained by the engaging recesses of the support member 10, respectively.

When the rotating shaft 11 is rotated with such a structure, friction torque of the coil spring 9 acts on the rotating shaft 11 in both rotation directions. This friction torque is used for angle adjustment of the display device or the like. is doing. FIG. 15 is disclosed in Japanese Utility Model Laid-Open No. 63-146248 as another prior art. In this structure, a coil spring 13 is fastened and attached to a rotary shaft 12, and stoppers 14 and 15 are directly in contact with both ends of the coil spring 13.

[0004]

[Problems to be Solved by the Invention]

 The conventional friction hinge described above is a friction hinge that utilizes the slip torque between the coil spring and the rotating member that are closely attached to the rotating member, but when the slip torque is applied to the coil spring, The shape is deformed and broken due to the maximum bending stress generated on the opposite diameter to the support points on both ends. Although FIG. 16 is an explanatory view of that state, both ends of the coil spring 13 are pressed and deformed as shown by the dotted line, and the coil spring 13 is broken at 16 due to the maximum bending stress generated on the opposite diameter. The present invention eliminates such conventional drawbacks, provides a friction hinge that stabilizes the fluctuation of friction torque due to the deformation of the coil spring end portion, prevents breakage, and greatly improves the number of durability. It is an object.

[0005]

[Means for Solving the Problems]

 The friction hinge of the present invention comprises a rotating shaft, a coil spring having an inner diameter smaller than the outer diameter of the rotating shaft and closely fitted to the outer side of the rotating shaft, and on both sides of the coil spring. A support member for rotatably supporting the rotating shaft is brought into contact with the outside of the coil spring to prevent deformation of the coils at both ends of the coil spring due to rotation of the rotating shaft, and to add to both ends of the coil. It is characterized by comprising the cover member for reducing bending stress.

[0006]

[Action]

 Since the structure of this invention has an effect of preventing the shape of the coils at both ends from being deformed, it is possible to secure sufficient durability performance with a compact structure having a small size and shape.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 is a front view of an embodiment of the present invention, FIG. 2 is a bottom view of the same, and FIG. 3 is a right side view. 4 is a front view and a right side view of the cover member, FIG. 5 is a view in which the cover member is removed from FIG. 1, and FIG. 6 is a bottom view of the same. As shown in FIGS. 5 and 6, two left-handed and right-handed coil springs 1 and 2 are fitted on the outer periphery of the rotary shaft 5. Since the inner diameters of the coil springs 1 and 2 are smaller than the outer diameter of the rotating shaft 5, the coil springs 1 and 2 are closely fitted to the rotating shaft 5.

Reference numeral 3 denotes a support member that rotatably supports the rotary shaft 5, and its side walls 3 ′ are arranged so as to be located at both ends of the coil springs 1 and 2, and also serve as stoppers. It's done. The side wall 3'is formed integrally with the support member 3, but the side wall 3'may be formed as a separate part depending on the assembly method and the shape of the rotating shaft 5. The support member 3 is provided with means for fixing it to the fixed structure, for example holes 4 for screwing. The hole 4 can be provided in the side wall portion by making the side wall 3'slightly larger. The respective ends of the coil springs 1 and 2 are in contact with the respective parts of the corresponding support member 3.

The cover member 6 has a shape as shown in FIG. As shown in FIG. 7, one end 6-1 was inserted into the end of the support member 3, and then the tongue 6-2 at the center of the other end was provided on the support member 3 on the opposite side. It is inserted into the hole and pressed and held on the coil springs 1 and 2. As a result, the both ends 6-3 of the cover member 6 press the ends of the coil springs 1 and 2, and the deformation of the coil spring ends shown by the dotted line in FIG. 10 is prevented. Since the support member 3 does not shift to the left and right with respect to the rotating shaft 5, as shown in FIGS. 1 and 2, grooves are provided at both ends of the rotating shaft 5 where the supporting member 3 is located, and the ring 7 is formed in the groove. , 8 are attached.

Although the cover member 6 is fixed to the support member 3 in the above embodiment, it may be fixed to both ends of the coil springs 1 and 2 or the two coil springs 1 and 2. Although the coil springs are fixed by one cover member 6, the cover members may be separately fixed by each coil spring as shown in FIGS. 7 and 8. In FIG. 1, when the rotating shaft 5 rotates in the direction of arrow A, the coil springs 1 and 2 inside also try to rotate in the direction of arrow A, but the end of each coil spring contacts the support member 3. Therefore, the rotation of the coil springs 1 and 2 in the arrow A direction is prevented. When the rotary shaft 5 is further rotated in the direction of arrow A, the coils of the coil springs 1 and 2 are arbitrarily opened, but since the cover members 6 are in contact with each other, the deformation of both ends of the coil springs is prevented by the cover member 6. Even if the coil springs 1 and 2 are stopped and continue to rotate, the coil springs 1 and 2 do not rotate and stay in the same positions, and friction is generated between the rotating shaft 5 and the coil springs 1 and 2 to serve as a friction hinge. It will function. When the rotating shaft 5 rotates in the direction of arrow B, the other ends of the coil springs 1 and 2 shown in the central portion of FIG. Like the case, it acts as a friction hinge.

In the above embodiment, the coil spring 1 is left-handed and 2 is right-handed. However, one or more coil springs may be used depending on the torque to be used, and the coil is tightly wound. The pitch winding may have a gap between the coils as shown in FIGS. 11 and 12 show an example in which the supporting member is divided on both sides of the coil. Further, both ends of the coil spring are cut in FIG. 13, but the ends can be bent to increase the contact surface with the support member. The cross-sectional shape of the wire used for the coil spring may be irregular, rectangular or round.

[0012]

[Effect of device]

 According to this invention, when slip torque is applied to the rotating shaft of the friction hinge as in the conventional coil spring, torque drop due to deformation of both ends of the coil spring and breakage of the coil end are eliminated, and durability is improved. It is possible to greatly improve it, and to reduce the outer diameter of the hinge to generate a large torque.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is a bottom view of FIG.

FIG. 3 is a right side view of FIG.

FIG. 4 is a front view and a right side view of a cover member.

5 is a front view showing a state in which a cover member is removed in FIG. 1. FIG.

FIG. 6 is a bottom view of FIG.

FIG. 7 is a front view of another embodiment.

FIG. 8 is a bottom view of FIG. 7.

FIG. 9 is a front view with a cover member of another embodiment removed.

FIG. 10 is a bottom view of FIG.

FIG. 11 is a front view of another embodiment.

FIG. 12 is a right side view of FIG. 11.

13 is a sectional view taken along line XX of FIG.

FIG. 14 is a front view of a conventional technique.

FIG. 15 is a front view of another conventional technique.

FIG. 16 is a modified view of a coil spring of the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 coil spring 2 coil spring 3 supporting member 3'side wall 4 hole 5 turning shaft 6 cover member 6-1 one end of cover member 6-2 tongue-like piece 6-3 both ends of cover member 7 ring 8 ring 9 coil spring

Claims (1)

[Scope of utility model registration request] 1. A rotating shaft, a coil spring having an inner diameter smaller than an outer diameter of the rotating shaft, and a coil spring closely fitted to the outer side of the rotating shaft, and at both ends of the coil spring, A support member that rotatably supports the rotating shaft and a cover member that comes into contact with the outside of the coil spring to prevent deformation of the coils at both ends of the coil spring due to the rotation of the rotating shaft are provided. Characteristic friction hinge.