JP2000346047A - Tilting hinge for office automation instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain compactness and provide high torque by providing a nonagonal hole in a rotary friction plate so as to be the same shape as a bearing part for synchronous rotation therewith. SOLUTION: A bearing part 1b is a nonagonal shape. Each rotary friction plate 2, 4, 6 has a hole of the same nonagonal shape as the bearing part 1b for synchronous rotation therewith. A device main body mounting plate 3 and a fixing friction plate 5 are formed of a circular hole for rotatably supporting the bearing part 1b. The mounting plate 3 is formed of an engaging hole 3a, to which an engaging projection 5a formed in the fixing friction plate 5 is engaged, and a rotary shaft 1 is rotated. The bearing part 1b can be made to be small diameter since the bearing part 1b is made into nonagonal shape and the rotary friction plates 2, 4, 6 synchronously rotating therewith have nonagonal holes. Moreover, high torque is provided since contact area of the rotary friction plates 2, 4 contacting to the device main body mounting plate 3 and the fixing friction plate 5 is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an OA device for opening and closing a display of an OA device such as a personal computer or a word processor.
The present invention relates to a tilt hinge for an A device.

[0002]

2. Description of the Related Art An example of a conventional tilt hinge for OA equipment will be described with reference to FIG. The rotating shaft 30 has a large diameter portion 30.
a small-diameter bearing portion 30b formed on one side of
A display body mounting portion 30c formed on the other side of the large diameter portion 30a. In the bearing portion 30b, the rotary friction plate 31, the device body mounting plate 3
2. The rotating friction plates 33 and 34, the spring washers 35 and the spacers 36 are inserted, and the ends of the bearing portions 30b are swaged to fix the rotating friction plates 31 and 3 on both sides of the apparatus body mounting plate 32.
3 is pressed. The display body mounting portion 30c is fixed to the display body 21 via the holding plate 20, and the apparatus body mounting plate 32 is fixed to the apparatus body 22.

As this kind of tilt hinge for OA equipment,
For example, Japanese Utility Model Laid-Open No. 5-21079 and Japanese Utility Model Laid-Open No. 5-210.
No. 80, JP-A-7-324552, JP-A-1
No. 0-280781 and the like.

[0004]

In the above prior art, the bearing 30b has a round shape, and the rotary friction plates 31, 33, and 34 have round holes. Therefore, when the rotating shaft 30 is rotated, the rotating friction plates 31 and 33 may not rotate together with the rotating shaft 30, and a predetermined torque cannot be obtained between the apparatus body mounting plate 32 and the rotating friction plates 31 and 33. There was a problem.

As a solution to this problem, a bearing 3
0b is provided with a groove or a flat surface.
There is provided a configuration in which projections engaging with the grooves or flat surfaces corresponding to the flat surfaces are provided in the holes 3 and 34 so that the rotating friction plates 31, 33 and 34 rotate together with the rotating shaft 30. However, this structure does not
Since a groove or flat surface is provided in b, the bearing 3
0b cannot be reduced, and the size increases. In addition, when the size is reduced, the apparatus body mounting plate 32 and the rotating friction plates 31, 3
3 has a problem that the contact area with the third member becomes small, and high torque cannot be obtained.

SUMMARY OF THE INVENTION An object of the present invention is to provide a tilt hinge for OA equipment which is small in size and high in torque.

[0007]

According to a first aspect of the present invention, there is provided a rotary shaft having a small-diameter bearing at an end of a large-diameter portion and serving also as a support for a display body. An apparatus body mounting plate fixed to the apparatus main body and rotatably supporting the bearing part of the rotating shaft, and inserted into the bearing part so as to be in pressure contact with both sides of the apparatus body mounting plate. In the tilt hinge for OA equipment, at least a rotary friction plate held by surface friction at a position of the rotary shaft, a bearing portion of the rotary shaft has a nine-sided shape, and the rotary friction plate is configured to rotate with the bearing portion. It is characterized in that it is a nine-sided hole having the same shape as the part.

A second means of the present invention for solving the above-mentioned problems is the first means, wherein the device body mounting plate and one of the rotating friction plates arranged on both sides of the device body mounting plate are opposed to each other. A wavy oil groove is formed on the surface from the inner peripheral portion to the outer peripheral portion and from the outer peripheral portion to the inner peripheral portion.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the rotating shaft 1 has a bearing portion 1b having a small diameter formed on one side of a large diameter portion 1a and a display body mounting portion 1c formed on the other side of the large diameter portion 1a. are doing. In the bearing portion 1b,
The rotating friction plate 2, the device body mounting plate 3, the rotating friction plate 4, the fixed friction plate 5, the rotating friction plate 6, the spring washer 7, and the spacer 8 are inserted sequentially from the large-diameter portion 1a.
The rotating friction plates 2 and 4 are pressed against both sides of the apparatus main body mounting plate 3 by caulking the end of b. The display body mounting portion 1c is fixed to the display body 21 via the holding plate 20, and the apparatus body mounting plate 3 is fixed to the apparatus body 22.

The bearing 1b has a nine-sided shape as shown in FIG. The rotary friction plates 2, 4, and 6 have the same nine-sided holes as the bearing 1b so as to rotate with the bearing 1b. The device body mounting plate 3 and the fixed friction plate 5 are formed with round holes for rotatably supporting the bearing 1b.
An engagement hole 3a is formed in the apparatus body mounting plate 3, and an engagement protrusion 5 formed in the fixed friction plate 5 is formed in the engagement hole 3a.
a is engaged.

As a result, the rotating shaft 1 can rotate only when a predetermined rotating torque is applied, and the display body 21 can be stopped at an arbitrary position.
As shown in FIG. 3, corrugated oil grooves 3 b are formed continuously from the inner peripheral portion to the outer peripheral portion and from the outer peripheral portion to the inner peripheral portion on both surfaces of the apparatus main body mounting plate 3.

As described above, the bearing portion 1b has a nine-sided shape, and the rotary friction plates 2, 4,.
6 also has a nine-sided hole, so that the following effects can be obtained. The diameter of the bearing portion 1b can be reduced, and the contact area between the rotating friction plates 2 and 4, which are in contact with the device main body mounting plate 3 and the fixed friction plate 5, is increased, and high torque can be obtained. Further, since the contact between the nine-sided shape of the bearing portion 1b and the nine-sided holes of the rotary friction plates 2, 4, and 6 is a combination of three triangular shapes and three triangular holes, the rotating shaft 1 is stabilized. Can be rotated.

When the rotating shaft 1 and the rotating friction plates 2, 4, and 6 are rotated by opening and closing the display body 21, the oil in the oil groove 3b of the apparatus body mounting plate 3 moves along the oil groove 3b. That is, the oil moves from the inner peripheral portion to the outer peripheral portion and from the outer peripheral portion to the inner peripheral portion of the apparatus body mounting plate 3. As a result, the oil is supplied while moving along substantially the entire surface of the rotating friction plates 2 and 4, so that the friction between the apparatus body mounting plate 3 and the rotating friction plates 2 and 4 is reduced, and the durability is improved. Is improved.

FIG. 4 shows another embodiment of the present invention. In the above-described embodiment, only the rotary friction plate 2 is provided between the large diameter portion 1a and the device main body mounting plate 3. In the present embodiment, the large-diameter portion 1
A fixed friction plate 10 is provided between the fixed friction plate 10a and the apparatus main body mounting plate 3, and rotating friction plates 11 and 12 are provided on both sides of the fixed friction plate 10.
Other configurations are the same as those of the above embodiment. Like the fixed friction plate 5, the fixed friction plate 10 is formed with a round hole for rotatably supporting the bearing portion 1b. An engagement projection 10a formed on the fixed friction plate 10 is formed in the engagement hole 3a of the apparatus body mounting plate 3. Is engaged. The rotary friction plates 11 and 12 have nine-sided holes like the rotary friction plates 2, 4 and 6.

By providing the fixed friction plates 10 and the rotating friction plates 11 and 12 in this manner, the same effects as in the above embodiment can be obtained, and the torque can be further improved.

In each of the above-described embodiments, the case where the oil groove 3b is provided on the apparatus main body mounting plate 3 has been described.
An oil groove having the same shape as the oil groove 3b may be provided on a surface of the rotary friction plates 2 and 4 facing the apparatus body mounting plate 3. Also, the case where the ends of the bearing portion 1b and the display body attaching portion 1c are caulked has been described. Needless to say.

[0017]

According to the present invention, the bearing portion of the rotating shaft has a nine-sided shape, and the rotating friction plate has a nine-sided hole having the same shape as the bearing portion so as to rotate together with the bearing portion.
Small size and high torque can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a tilt hinge for OA equipment of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along line AA of FIG.

3A and 3B show an apparatus main body mounting plate, wherein FIG. 3A is an enlarged front view and FIG. 3B is an enlarged cross-sectional view.

FIG. 4 is a sectional view showing another embodiment of the tilt hinge for OA equipment of the present invention.

FIG. 5 is a sectional view showing a conventional tilt hinge for OA equipment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotation shaft 1a Large diameter part 1b Bearing part 1c Display body attachment part 2 Rotation friction plate 3 Device body attachment plate 3b Oil groove 4 Rotation friction plate 5 Fixed friction plate 6 Rotation friction plate 10 Fixed friction plate 11, 12 Rotation friction plate 21 Display 22 Device body

Claims (2)

[Claims] A rotary shaft having a small-diameter bearing portion at an end of a large-diameter portion and also serving as a support portion of a display body, rotatably supports the bearing portion of the rotary shaft, and is fixed to an apparatus body. A tilt hinge for an OA device including at least an apparatus main body mounting plate and a rotary friction plate inserted into the bearing portion so as to be pressed against both sides of the apparatus main body mounting plate and holding the rotary shaft at an arbitrary position by surface friction. Wherein the bearing portion of the rotary shaft has a nine-sided shape, and the rotary friction plate has a nine-sided hole having the same shape as the bearing portion so as to rotate with the bearing portion. Tilt hinge. 2. A corrugated oil groove is formed from an inner peripheral portion to an outer peripheral portion and from an outer peripheral portion to an inner peripheral portion on one of opposing surfaces of a rotating friction plate disposed on both sides of the device main body mounting plate and the device main body mounting plate. The OA according to claim 1, wherein the OA is formed so as to face.
Tilt hinge for equipment.