JPH0425796A - Tilt mechanism of electronic equipment - Google Patents

Abstract

PURPOSE:To secure torque resistance and suppress the extent of its decrease by providing a wedgelike sectioned annular groove or projection which engages it opposite a rotary shaft and a friction material which abuts on it, and clamping a fitting part from its outer periphery. CONSTITUTION:The friction material 2 which has the annular projection (or groove) 2a corresponding to the rotary shaft 1 which has the wedgelike annular groove (or projection engaging it) 1a is engaged with the rotary shaft 1 and the fitting part is clamped by a fitting member 3 from the outer periphery. Consequently, a large frictional force is generated by utilizing the wedge effect of the fitting part to sufficiently secure the torque resistance performance of the rotary shaft 1 though a clamping force is not made large so much. Further, even if the fitting part wears away, the decrease rate of the torque resistance performance becomes small by the effect.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a tilt mechanism for supporting a display device such as a CRT in an adjustable angle in an electronic device such as a personal computer or a word processor.

[Conventional technology]

FIG. 5 is an exploded perspective view illustrating a tilt mechanism of a conventional electronic device. In the same figure, a holding member 12 to which a display 11 is fixed is attached to the circumferential surface of a rotating shaft 13 fixed to the main body of the device.
The holding member 12 is fixed to the rotating shaft 13 by fitting the holding member 12 and fastening one end of the holding member 12 with a screw 14.15.

In the conventional tilt mechanism of electronic equipment, the screw 14.1
By tightening 5, the inner diameter of the holding member 12 is reduced, the frictional force between the rotating shaft 13 and the holding member (fixed cylinder) 12 is increased, and the torque resistance of the rotating shaft 13 is increased. Ta.

In this case, when the screws 14.15 are loosened, the rotating shaft 13
The torque resistance of is rapidly reduced.

On the other hand, in recent years, the display devices of electronic devices such as information devices have become larger and larger. Therefore, for example, in the case of laptop-type information devices, in order to rotate the large display device, it is necessary to There is a need for improved torque resistance.

[Technical Problem to be Solved by the Invention] However, in the conventional tilt mechanism of an electronic device, when the screws 14 and 15 are strongly tightened in order to increase the torque resistance of the rotating shaft 13, the holding member (fixed cylinder) 12 This may cause deformation of the material, which may actually reduce the torque resistance.

In addition, if it is tightened strongly, the housing of the display device 11 may be deformed.

The present invention was made in view of such conventional technical problems, and it is possible to tighten without increasing the force very much.
It is an object of the present invention to provide a tilt mechanism for an electronic device that can ensure sufficient torque resistance of a rotating shaft and can suppress the degree of reduction in torque resistance due to wear of a fitting portion or the like.

[Means for solving problems]

In the tilt mechanism of an electronic device of the present invention, an annular groove or an annular protrusion having a wedge-shaped cross section is formed on a rotating shaft, and the annular groove or annular protrusion is formed on an inner surface of a friction member that is slidably in contact with the rotating shaft in a circumferential direction. By forming an annular protrusion or an annular groove with a wedge-shaped cross section that engages with the rotary shaft and tightening the fitting portion between the rotating shaft and the friction member from the outer periphery, tightening can be performed without using a large force. It is an object of the present invention to provide a tilt mechanism for an electronic device that is capable of ensuring sufficient torque resistance of a rotating shaft, and also capable of suppressing a reduction in torque resistance due to wear of a fitting portion or the like.

[Effect]

According to the above configuration, a friction member having an annular projection (or annular groove) corresponding to the annular groove (or annular projection) is engaged with a rotating shaft having a wedge-shaped annular groove (or annular projection), and these members are engaged with each other. Since the fitting part between the rotating shaft and the friction member is tightened with the member from the outer periphery, an extremely large frictional force is generated due to the wedge effect of the fitting part, and the torque resistance against the member increases significantly when the rotating shaft is attached. .

Furthermore, even if the fitting portion is worn, the wedge effect reduces the rate of decrease in torque resistance, thus improving the durability of the tilt mechanism.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to FIGS. 1 to 4.

FIG. 1 is an exploded perspective view showing one embodiment of a tilt mechanism for an electronic device according to the present invention, and FIG. 2 is a perspective view showing an assembled state of the tilt mechanism of FIG. 1.

In FIGS. 1 and 2, a Wl rubbing member 2 with a half-split cross section is attached to the circumferential surface of the rotating shaft l fixed to the main body side of the electronic device.
The friction member 2 is slidably engaged with the friction member 2 in the circumferential direction, and a mounting member 3 to which a display is fixed is fixed to the outer peripheral surface of the friction member 2.

The rotating shaft 1 has ribs 1b and 1c provided at its base.
It is fixed to the main body of the electronic device by fastening with bolts or the like.

Further, the circumferential surface of the central portion of the rotating shaft 1 has a wedge-shaped cross section (
A plurality of (V-shaped) annular grooves 1a are formed at a predetermined pitch (three in the illustrated example), and an axial straight groove 1d is formed in the reduced cross-section at the tip of the rotating shaft 1.

The friction member 2 is composed of two members each having a semicircular cross section, and each friction member 2 has a plurality of (four in the illustrated example) wedge-shaped wedges on its inner surface that engage with the annular groove 1a of the rotating shaft 1. Cross section (V
An annular protrusion 2a having a letter-shaped shape is formed.

Projections 2b and 2C are provided on the outer peripheral surface of each friction member 2.

The mounting member 3 is a clamp member that is integrally formed with a cylindrical part separated from a part in the circumferential direction and ribs 3a and 3b protruding from the separated part for tightening and fixing the display. It is configured.

This attachment means that the cylindrical part of the member 3 has the friction member 2
Holes 3C23d are formed to fit with the protrusions 2b and 2C.

Furthermore, holes 3e and 3f for tightening screws 5.6 are formed in the ribs 3a and 3b.

In this installation, the inner diameter of the cylindrical part of the member 3 is
．． The tightening of 6 can be increased or decreased by adjusting the force.

A return spring 4 of a tilt mechanism is attached to the rotating shaft 1. The return spring 4 is attached to the rotating shaft 1 by inserting one end thereof into the linear groove 1d.

When assembling the tilt mechanism, the protrusion 2a of the friction member 2 is fitted into the groove 1a of the rotating shaft 1, and then the inner diameter of the mounting member 3 is fitted onto the outer peripheral surface of the uneven friction member 2. .

At this time, the protrusions 2b and 2c of the friction member 2 are attached to the member 3.
into the holes 3c and 3d.

Next, one end of the spring 4 is inserted into the groove 1d of the rotating shaft l, and the spring 4 is attached to the rotating shaft l.

Therefore, the ribs 1b and 1c of the rotating shaft 1 are fixed to the main body side of the electronic device, and the member 3 is fixed to the display device with screws 5.6.

In addition, in the illustrated example, an annular groove 1a is formed in the rotating shaft 1,
Although the annular protrusion 2a is formed on the friction member 2, this fitting part can be the same even if the groove and the protrusion are reversed, and the annular protrusion is formed on the rotating shaft 1 side and the annular groove is formed on the friction member 2 side. be.

As described above, the tilt mechanism of the electronic device of the present invention, that is, the annular groove 1a or the annular protrusion having a wedge-shaped cross section is formed on the rotating shaft 1, and the friction member 2 that contacts the rotating shaft 1 so as to be able to slide in the circumferential direction. An annular projection 2a or an annular groove having a wedge-shaped cross section that engages with the annular groove 1a or annular projection is formed on the inner surface, and the fitting portion between the rotating ring 1 and the friction member 2 is tightened from the outer periphery. A tilt mechanism for electronic equipment is configured.

FIG. 3 is a schematic front view showing a state in which the tilt mechanism according to the present invention is attached to an electronic device.

In FIG. 3, a display 22 such as a CRT or liquid crystal type is tilted at an angle with respect to a main body 21 of an electronic device via a tilt mechanism 25 according to the present invention. It is attached with 11 sections.

23 indicates a keyboard provided on the main body 21.

The rotation shaft 1 of the tilt mechanism 25 is fixed to the electronic device main body 21 via ribs Ib and lc, and the friction member 3 is fixed to the display 22 side by tightening screws 5.6.

In that case, use the screws 5.6 to attach the member 3 to the display 2.
2, the inner diameter of the member 3 is reduced and the wedge-shaped annular protrusion 2a of the friction member 2 is attached to the rotation axis l.
It bites into an annular groove 18 with a wedge-shaped cross section.

At this time, an extremely large frictional force is generated in the fitting portion due to the wedge effect.

Therefore, a large rotational sliding torque is generated between the rotating shaft 1 and the mounting member 3, compared to the tightening force of the screw 5.6.

According to the embodiment described above, the rotating shaft 1 having the wedge-shaped annular groove (or annular projection) la has an annular projection (or annular groove) corresponding to the annular groove (or annular projection) Ia.
2a, and the fitting portion between the rotary shaft 1 and the friction member 2 is tightened with the member 3 from the outer periphery, so the wedge effect of the fitting portion is utilized to create extremely large friction. Therefore, the tightening force does not have to be very large (and the torque resistance of the rotating shaft 1 can be sufficiently ensured, and the wedge effect makes it possible to tighten the Even when wear occurs, the rate of decrease in torque resistance is small, and a tilt mechanism for electronic equipment with excellent durability has been obtained.

FIG. 4 is an exploded perspective view showing another embodiment of the tilt mechanism for electronic equipment according to the present invention.

In this embodiment, each friction member 2 is divided into the same number of semicircular members 7 as the number of annular grooves 1a of the rotating shaft 1.

That is, the semicircular member 7 having the annular protrusion 2a having a wedge-shaped cross section is individually fitted into each annular groove 1a of the rotating shaft l.

A protrusion 2b is formed on the outer peripheral surface of each semicircular member 7.

In this embodiment, the mounting member 3 is divided into two semi-cylindrical parts 8.9, and ribs 3a and 3b for tightening are provided on both sides of each semi-cylindrical part 8.9. A total of 4
It is designed to be tightened with 5.6 book screws.

Further, each semi-cylindrical portion 8.9 is formed with an axially elongated hole 8a, 9a in which the protrusion 2b of the friction member 2 engages.

Although this embodiment differs from the embodiments shown in FIGS. 1 to 3 in the points explained above, other parts have substantially the same structure, and corresponding parts are indicated by the same reference numerals. However, detailed explanation thereof will be omitted.

According to the embodiment shown in FIG. 4, in addition to the effects similar to those of the previous embodiment, the following effects were also obtained.

That is, in the above-mentioned embodiment, since the plurality of annular grooves 1a and annular protrusions 2a are integrally formed on each of the rotating shaft 1 and the friction member 2, it is necessary to machine the pitch intervals with high precision. If there is a pitch error, it will be difficult to obtain an appropriate wedge effect, and there is a risk that the torque resistance between the rotating shaft 1 and the attachment member 3 will deteriorate.

On the other hand, according to this embodiment, since the friction member 2 is divided into individual annular protrusions 2a, the problem of pitch error with the annular groove 1a of the rotating shaft 1 can be solved, and it is easy to maintain a proper fitted state at all times. The torque resistance performance of the rotating shaft 1 and the mounting member 3 can be easily maintained in an appropriate state.

In addition, since the member 3 was attached in a half-split structure, it was possible to improve the workability when assembling the tilt mechanism.

In the embodiment shown in FIG. 4 as well, an annular protrusion with a wedge-shaped cross section is formed on the circumferential surface of the rotating shaft 1, and an annular groove with a wedge-shaped cross section is formed on the side of the friction member 2 (each semicircular member 7). structure can be adopted.

〔Effect of the invention〕

As is clear from the above description, according to the tilt mechanism of the electronic device of the present invention, an annular groove or an annular protrusion with a wedge-shaped cross section is formed on the rotating shaft, and the friction abuts on the rotating shaft so as to be slidable in the circumferential direction. forming an annular protrusion or annular groove with a wedge-shaped cross section on the inner surface of the member to engage with the annular groove or annular protrusion;
Since the fitting portion between the rotating shaft and the friction member is tightened from the outer periphery, sufficient torque resistance of the rotating shaft can be ensured without increasing the tightening force.
Moreover, there is provided a tilt mechanism for electronic equipment that can suppress the degree of decrease in torque resistance due to wear of the fitting portion or the like.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the tilt mechanism of an electronic device according to the present invention, FIG. 2 is a perspective view showing an assembled state of the tilt mechanism of FIG. 1, and FIG. 3 is a perspective view of the tilt mechanism of FIG. 1. FIG. 4 is an exploded perspective view showing another embodiment of a tilt mechanism for an electronic device according to the present invention, and FIG. 5 is an example of a conventional tilt mechanism for an electronic device. It is an exploded perspective view. Below, symbols representing main components in the drawings are listed. 1-・・・・・One rotating shaft, 1a・・・・An annular groove with a wedge-shaped cross section, 2・・・・Friction member, 2a・・・・・・An annular protrusion with a wedge-shaped cross section, 3・・・・－・・・Installation is by parts,
3a, 3b --- Rib for fixing the display, 5.6 ---
---Tightening is a screw, 7., 4 semi-circular member (friction member), 8.9-...- semi-cylindrical part (attachment is a member).

Claims (1)

[Claims] (1) An annular groove or annular protrusion with a wedge-shaped cross section is formed on the rotating shaft, and the wedge-shaped cross section engages with the annular groove or annular protrusion on the inner surface of a friction member that contacts the rotating shaft so as to be able to slide in the circumferential direction. 1. A tilt mechanism for an electronic device, characterized in that an annular protrusion or an annular groove is formed, and a fitting portion between the rotating shaft and the friction member is tightened from the outer periphery.