JP2916810B2 - Slow rotation shaft device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slow rotating shaft device that rotatably supports a first rotating member and a second rotating member that rotate relative to a fixed member.

As the opening / closing device having two independently rotating members, a case for a data compact disc,
Alternatively, there is a cosmetic compact case or the like, and the slow rotating shaft device of the present invention is used for a pivotal support of the two rotating members.

2. Description of the Related Art As shown in FIG. 5, a conventional slow-rotating shaft device is used for each rotating member in a conventional opening and closing device having two independently rotating members.

In FIG. 5, the opening and closing device comprises a first rotating member 1a and a second rotating member 1a.
And the rotating member 1b are mounted so as to rotate relative to the fixed member 2. In this case, the slow rotating shaft device is composed of a shaft body 3 mounted on a pivotal support of each of the rotating members 1a and 1b.

As shown in FIGS. 6 and 7, the shaft body 3 includes a hollow shaft body 31, cap members 32 and 33 rotatably inserted on both sides of the shaft body 31, and a one-end hook portion 41. The torsion bar 4 having the other end hook portion 42 engaged within the cap member 33, the shaft main body 31 and the cap member 32.
, And viscous grease (not shown) enclosed between 33.

The shaft body 31 is provided with cap members 3 on both sides of the central large-diameter shaft portion 31a.
A small-diameter shaft portion 31b for rotatably extrapolating 2, 2 and 33 is formed with a stepped shaft body, and a slit-shaped through hole 34 is formed in the length direction, and a large-diameter shaft is formed. Part 31a
Is formed with a key 35 protruding therefrom. Cap member 32 and
33 has a bottomed cylindrical body whose inner diameter is substantially the same as the outer diameter of the small-diameter shaft portion 31b, and whose outer diameter is substantially the same as the outer diameter of the large-diameter shaft portion 31a. And 38 are protruded.

At the bottom of one of the cap members 33, a slit-shaped recess is provided.
36 are formed. The cap members 32 and 33 are externally inserted into the small-diameter shaft portions 31b and 31b, and the annular grooves 32a and 33a of the cap members 32 and 33 are formed in the annular ribs 31c of the small-diameter shaft portions 31b.
The shaft body 31
It is rotatably assembled to

In this assembled state, the torsion bar 4 is
31 is inserted into the through-hole 34, one end hook part 41 is engaged with the through-hole 34, and the other end hook part 42 is a cap member.
The viscous grease is sealed between the cap members 32 and 33 and each of the small-diameter shaft portions 31b.

The shaft body 3 assembled in this manner positions the large-diameter shaft portion 31a of the shaft body 31 inside the shaft support portion 11a (11b) of the rotating member 1a (1b), and connects the cap members 32 and 33 to the fixing member 2 respectively. The keys 35, 37, and 38 are located in the bearing portions 21 (23) and 22 (24), and the keys 35, 37, and 38 are connected to the shaft support portions 11a (11b) and the bearing portions 21.
(23) and 22 (24) are fitted into key grooves (not shown) respectively formed on the large-diameter shaft portion 31a and the shaft support portions 11a (11b).
In addition, the cap members 32 and 33 are connected to the bearing portions 21 (23) and 22 (2
4) Each is mounted in a non-rotatable state.

In the conventional slow rotating device configured as described above, the rotating members 1a and 1b are rotated by the torque of the torsion bar 4. At this rotation, shear resistance of the viscous grease occurs, and the rotation of the torsion bar 4 is prevented. It can rotate at a slow speed regardless of the torque load.

[Problems to be Solved by the Invention] However, the conventional slow rotating shaft device has only a function of rotating one rotating member relatively rotating with respect to the fixed member at a slow speed, and has only two rotating members. In the above-described switchgear having members, it is necessary to provide two (two-axis type).

For this reason, in the opening / closing device having two rotating members, it is necessary to secure a large installation space for the slow rotating shaft device, and it is difficult to secure the installation space, for example, a cosmetic compact case or a data compact disk case. It was difficult to apply the slow rotating shaft device to the small opening / closing device.

In addition, there is a problem that the cost is increased due to the provision of the plurality of slowly rotating shaft devices.

The present invention has been made in view of the above circumstances,
An object of the present invention is to provide a single-axis type slowly rotating shaft device which can control the speed of two rotating members and does not take up installation space.

[Means for Solving the Problems] In order to achieve the above-described object, a slow rotating shaft device of the present invention rotatably supports a first rotating member and a second rotating member that rotate relative to a fixed member. A shaft that is non-rotatably engaged with the first rotating member.
And a second hollow shaft body rotatably inserted into the first hollow shaft body and non-rotatably engaged with the second rotating member. Two cap members rotatably inserted into the first hollow shaft body side end and the second hollow shaft side end and non-rotatably attached to the fixed member, respectively, A torsion bar having both ends engaged with one of the cap member and the second hollow shaft, and the other of the cap member and the first hollow shaft, respectively, the first hollow shaft and the first hollow shaft; It is characterized by comprising viscous grease sealed between the shaft and the second hollow shaft inserted into the shaft.

[Operation] The first hollow shaft body and the second hollow shaft body constituting the shaft main body rotate integrally with the first rotating member and the second rotating member, respectively. This rotation is performed by the spring torque of the torsion bar, and when a difference occurs in the rotation speed between the two hollow shafts, shearing resistance of viscous grease sealed in the insertion portion of the two hollow shafts is generated.

The first and second rotating members rotate at a slow speed due to the shear resistance, despite the torque load on the torsion bar.

EXAMPLES Hereinafter, the present invention will be specifically described based on one example illustrated.

FIG. 1 shows a shaft body 50 of a slowly rotating shaft device. The shaft body 50 includes a shaft body 51, cap members 54 and 55 inserted on both sides of the shaft body 51, and torsion bars 61 and 62 inserted into the shaft body 51.
And a viscous grease 70 sealed in the shaft main body 51.

The shaft main body 51 is configured by inserting a first hollow shaft body 52 and a second hollow shaft body 53 so as to be mutually rotatable on the same central axis.

The first hollow shaft body 52 includes a through hole in which a large-diameter circular hole 52a, a medium-diameter circular hole 52b, and a small-diameter circular hole 52c are formed in a stepwise manner from the right side to the left side in FIG. And a key 81 protruding outside the shaft portion of the formation portion of the hole, and a slit-shaped hole is provided at the communication portion between the medium-diameter circular hole 52b and the small-diameter circular hole 52c.
52d are formed. Further, the end of the first hollow shaft body 52 where the small-diameter circular hole 52c is formed is formed in a small-diameter shaft portion 52e having an outer diameter smaller than the other shaft portions.

The second hollow shaft 53 is provided with small-diameter shaft portions 53 on both sides of the large-diameter shaft portion 53a.
a large-diameter circular hole 53d and a small-diameter circular hole 53e are formed in a stepwise manner from left to right in FIG. 1; and a large-diameter shaft portion 53a. A key 82 is formed to protrude outward, and a slit-like hole 53 is formed at a communicating portion between the large-diameter circular hole 53d and the small-diameter circular hole 53e. The outer diameter of the large diameter shaft portion 53a formed at this time is the first diameter.
While being formed substantially equal to the outer diameter of the shaft portion of the hollow shaft body 52,
The small-diameter shaft portion 53b has an outer diameter that can be inserted into the large-diameter circular hole 52a of the first hollow shaft body 52. Thus, the shaft main body 51 is formed by rotatably inserting the small-diameter shaft portion 53b of the second hollow shaft 53 into the large-diameter circular hole 52a of the first hollow shaft 52.
When the small-diameter shaft portion 53b is inserted into the large-diameter circular hole 52a, the viscous grease 70 is applied to the outer periphery of the small-diameter shaft portion 53b. It is enclosed between 52 and the second hollow shaft 53.

Cap members 54 and 55 are inserted into both sides of the shaft main body 51 thus assembled. The cap members 54 and 55 are rotatably inserted into the small diameter shaft portion 52e of the first hollow shaft member 52 and the small diameter shaft portion 53c of the second hollow shaft member 53, respectively.

The outer diameter of the cap members 54 and 55 is substantially equal to the outer diameter of the shaft portion of the first hollow shaft member 52 and the outer diameter of the large-diameter shaft portion 53a of the second hollow shaft member 53, and the inner diameters of the respective hollow shaft members 52 and 55 are equal to each other. 53 small diameter shaft 52e
And caps 54 and 55 are formed with slit-shaped holes 54a and 55a at the bottom thereof.

A key 83 is provided on the outside of the cylindrical body of the cap members 54 and 55.
And 84 are formed to project from each other.

The torsion bar is attached to the shaft body 50 thus assembled.
61 and 62 are interpolated.

The torsion bar 61 engages one end hook portion 61a with the slit-shaped hole 54a of the one cap member 54, and the other end hook portion 6a.
1b is fitted and engaged with the slit-like hole 53f of the second hollow shaft 53.

The other torsion bar 62 has a hook portion 62a at one end.
Is engaged with the slit-shaped hole 52d of the first hollow shaft body 52, and the other end hook portion 62b is connected to the slit-shaped hole 5d of the other cap member 55.
It is attached by engaging with 5a.

Thus, the torsion bars 61 and 62 are provided between the cap member 54 and the second hollow shaft 53, respectively, and
A spring torque acts between 55 and the first hollow shaft body 52.

The shaft body 50 is attached to a pivot of the opening / closing device A shown in FIGS.

The opening / closing device A is configured such that an upper lid 5 as a first rotating member and an intermediate lid 6 as a second rotating member relatively rotate around the same rotation axis with respect to a fixed member 7. At this time, the shaft body 50 is used as the rotation shaft.

The shaft body 50 includes a shaft support 5a of the upper lid 5, a shaft support 6a, 6b of the intermediate cover 6,
And the bearings 7a, 7b of the fixing member 7, and the key 81 is connected to the shaft support 5a, the key 82 is connected to the shaft support 6b, and the keys 83, 8
4 is attached by engaging key grooves formed in the bearing portions 7a and 7b, respectively.

The shaft body 50 mounted in this manner is provided with cap members 54 and 55.
Are mounted on the bearings 7a and 7b of the fixing member 7, the first hollow shaft 52 is mounted on the upper cover 5, and the second hollow shaft 53 is mounted on the intermediate cover 6 so as not to rotate. At this time, the upper lid 5 is urged in the opening direction by the torsion bar 62, and the intermediate lid 6 is urged in the opening direction by the torsion bar 61.

As described above, the upper lid 5 and the intermediate lid 6 are connected to the respective torsion bars 62.
And 61 are rotated in the opening direction by the spring torque, and the shearing resistance of the viscous grease 70 occurs during this rotation.

That is, with the intermediate lid 6 locked in the fully closed state, the upper lid 5 is locked.
In the opening direction, when the upper lid 5 is in the front open state and the intermediate lid 6 is operated in the opening direction, or when the operating speed of the upper lid 5 is faster than that of the intermediate lid 6, the shearing of the viscous grease 70 is performed. Due to the resistance, the upper lid 5 and the intermediate lid 6 open at a slow speed irrespective of the spring torque of the torsion bar.

When the upper lid 5 and the intermediate lid 6 are closed, the upper lid 5 and the intermediate lid 6 are normally operated in the closing direction at the same time. Therefore, there is no involvement of the shear resistance of the viscous grease 70 and the above operation is performed by the torsion bar 61. And 62 at once.

In addition, the method of applying the initial torque to the torsion bars 61 and 62 is as follows.

When attaching the shaft body 50 to the pivot portion of the upper lid 5 and the intermediate lid 6,
This is performed in a state where one of the two side ends of the shaft body 50 is projected outside the opening / closing device A.

That is, in order to apply the initial torque to the torsion bar 61, the end of the cap member 54 on the side of the cap member 54 is protruded outward of the opening / closing device A to release the mounting state between the cap member 54 and the bearing portion 7a. By rotating the torsion bar 61 appropriately, the shaft 50 is pushed into the pivot portion and the cap member 54 is non-rotatably attached to the bearing portion 7a while maintaining the twisted state.

Further, in order to apply the initial torque to the torsion bar 62, the end of the cap member 55 side is protruded outward from the opening / closing device A to release the mounting state between the cap member 55 and the bearing portion 7b. Perform in the same manner as described above.

As described above, in this embodiment, the initial torque can be applied independently and independently of each other by operating the torsion bars 62 and 61 associated with the upper lid 5 and the intermediate lid 6 respectively. Therefore, different initial torques can be applied to the torsion bars 62 and 61, respectively.

In this embodiment, one torsion bar 61 and one torsion bar 62 are used, but a plurality of torsion bars may be used to meet the required torque.

[Effects of the Invention] As described above in detail, according to the present invention, the first and second hollow shaft members respectively related to the first and second rotating members are rotatably connected on the same hollow shaft line. This is a single-axis type slowly rotating shaft device that constitutes the shaft main body, so the mounting space is narrow and a case for data compact disc,
Alternatively, it can be sufficiently applied to a small opening / closing device such as a compact case for makeup.

In addition, the speed of each of the two rotating members can be controlled independently of the single-shaft type.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a shaft constituting a slow-rotating shaft device according to an embodiment of the present invention, FIG. 2 is a transverse sectional view of the shaft, and FIG. Line cross-sectional view, FIG.
(C) is a cross-sectional view taken along line cc, (d) is a cross-sectional view taken along line d-d, (e) is a cross-sectional view taken along line ee, and (f) is f FIG. 3 (g) is a cross-sectional view taken along the line gh, FIG. 3 (h) is a cross-sectional view taken along the line hh, FIG. 3 is a perspective view of an opening / closing device incorporating the slow rotating shaft device. FIG. 4 is an exploded perspective view of the opening / closing device, FIG. 5 is a perspective view of the opening / closing device incorporating a conventional slow rotating shaft device, FIG. 5A is an overall perspective view, and FIG. 6 is a perspective view of a rotating member of the opening and closing device, FIG. 6 is an exploded longitudinal sectional view of a shaft constituting the conventional slow rotating shaft device, and FIG. 7 (a) is a view of one cap member of the shaft. FIG. 7 (b) is a sectional view taken along the line bb of the shaft, and FIG. 7 (c) is a left side view of the other cap member of the shaft. 5 upper lid (first rotating member) 6 intermediate lid (second rotating member) 7 fixing member 50 shaft body 51 shaft body 52 first hollow Shaft, 53 ... second hollow shaft, 54, 55 ... cap member, 61, 62 ... torsion bar, 70 ... viscous grease.

Claims (1)

(57) [Claims] 1. A shaft that rotatably supports a first rotating member and a second rotating member that rotate relative to a fixed member, wherein the shaft is not rotatable by the first rotating member. Having a first hollow shaft engaged with the first hollow shaft and a second hollow shaft rotatably inserted into the first hollow shaft and non-rotatably engaged with the second rotating member. A body, two cap members rotatably inserted into the first hollow shaft side end and the second hollow shaft side end of the shaft body and non-rotatably attached to the fixing member, One of the two cap members and the second
And a torsion bar having both ends engaged with the other cap member and the first hollow shaft member, respectively, the first hollow shaft member and a second torsion bar inserted into the first hollow shaft member. And a viscous grease sealed between the hollow shaft body and the second hollow shaft body.