JP2909664B2 - Slow rotation shaft device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating shaft device for rotatably supporting a second member which rotates relative to a first member. This slowly rotating shaft device is used for a pivot portion of an opening / closing device such as a compact case for makeup, a radio cassette, or a dashboard of an automobile.

[0002]

2. Description of the Related Art As shown in FIG. 17, this kind of slowly rotating shaft device comprises a shaft member 3 rotatably supporting a rotating member 1 which rotates relative to a fixed member 2. As shown in FIG.

As shown in FIGS. 18 to 21, 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 hook part 41 at one end. The other end hook portion 42 is engaged with the main body 31.
Torsion bar 4 which is engaged with cap member 33
And a viscous grease (not shown) sealed between the shaft main body 31 and the cap members 32 and 33.

[0004] The shaft main body 31 is formed of a stepped shaft having a small-diameter shaft portion 31b on each side of a central large-diameter shaft portion 31a for rotatably extrapolating cap members 32 and 33, respectively. A slit-shaped through-hole 34 is formed in the length direction, and a key 35 is formed to project from the large-diameter shaft portion 31a. Each of the cap members 32 and 33 is formed of 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.
Keys 37 and 38 are formed to protrude from the outer periphery of and 33.

[0005] A slit-like concave portion 36 is formed in the bottom of one cap member 33. 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 fitted into the annular ribs 31c of the small diameter shaft portions 31b to prevent the cap members 32 and 33 from coming off. Is rotatably assembled to the shaft main body 31.

In this assembled state, the torsion bar 4 is inserted into the through hole 34 of the shaft main body 31, one end hook portion 41 is engaged with the through hole 34, and the other end hook portion 42 is The viscous grease is assembled by engaging with the concave portion 36, and is sealed between the cap members 32 and 33 and each of the small diameter shaft portions 31b.

[0007] The shaft body 3 assembled as described above is shown in FIG.
As shown in (1), the rotating member 1 is erected by 90 ° with respect to the fixed member 2 so that the key grooves (not shown) provided in the respective rotating portions of the rotating member 1 and the fixed member 2 coincide with each other. Is inserted into. By this insertion, the shaft body 3 becomes the shaft body 3
1, the large diameter shaft portion 31a is positioned in the bearing portion 21 of the fixed member 2, and the cap members 32 and 33 are positioned in the shaft support portions 11 and 12 of the rotating member 1, respectively. 38 are fitted into key grooves (not shown) formed in the bearing portion 21 and the shaft supporting portions 11 and 12, respectively, the large-diameter shaft portion 31a is
2 and 33 are non-rotatably attached to the shaft supports 11 and 12, respectively.

In the conventional slow-rotating rotary shaft device constructed as described above, the rotating member 1 is rotated from the neutral point b in the closing direction, so that the jumping torque is accumulated in the torsion bar 4, and this jumping torque is accumulated. Fully closed point a that becomes the maximum
In, the rotating member 1 is fixed to the fixing member 2 using an appropriate locking means (see FIG. 22). For this reason, when the locking means is released, the rotating member 1 rotates in the opening direction due to the flip-up torque of the torsion bar 4. At this rotation, shear resistance of viscous grease is generated, and the torque load of the torsion bar 4 is also reduced. Regardless, it can rotate at a slow speed and stop at the neutral point b.

As described above, the conventional slow rotating shaft device is shown in FIG.
As shown in FIG. 2, the rotating member 1 performs a gentle operation in the α ₁ range from the fully closed point a to the neutral point b. At this time, a characteristic diagram of the rotational moment A of the rotating member 1 and the spring torque B of the torsion bar 4 is as shown in FIG.

[0010]

Such a conventional slow rotating shaft device has various problems as follows. First, as shown in the characteristic diagram of FIG. 23, the torque difference between the rotational moment A and the spring torque B has a large torque difference T near the fully closed point a (0 °), but around the neutral point b (90 °). Since the torque difference t is small, the rotating member 1 cannot be opened to the neutral point b by friction generated between the members of the shaft body 3 and between the members of the switching device 6 only by the spring torque of the torsion bar 4 alone. Even if it is opened to the neutral point b, the rotating member 1 swings and the stable standing state cannot be obtained with the small torque difference t described above.

Further, as shown in FIG. 22, the maximum rotation angle α of the rotating member 1 is set to approximately 135 °, and from the neutral point b to the fully open point c.
There is a demand to make the α ₂ region up to the free stop region in which the rotating member 1 can stop at an arbitrary position. In this case, the above-mentioned conventional slow rotating shaft device requires the above-mentioned demand. Can not achieve.

That is, the rotating member 1 is moved from the neutral point b to the fully open point c.
Rotating to the torsion bar 4 in the shaft 3 is twisted in the opposite direction to the time of the closing rotating in alpha ₁ domain described above, the torque is accumulated in the torsion bar 4. The accumulated torque acts to overcome the shear resistance of the viscous grease and return the rotating member 1 toward the neutral point b, so that the rotating member 1 cannot be stopped at an arbitrary position.

Further, the rotation of the rotary member 1 in the case alpha ₂ domain of rotating the rotary member 1 by torque of the torsion bar 4 the entire region of imparting an initial torque to the torsion bar 4 alpha ₁ zone and alpha ₂ domain Since the moment and the direction of action of the torque of the torsion bar 4 match, the rotating member 1 cannot be stopped at any position only by the shear resistance of the viscous grease.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a slow rotating shaft device used for a pivotal portion of a switching device in which the rotation angle of a rotating member exceeds a neutral point. A free stop area where the rotating member can be rotated at a slow speed by the torsion bar flip-up torque in the rotation range within the point, and the rotation member can be stopped at any position in the rotation range beyond the neutral point It is an object of the present invention to provide a slow rotating shaft device which enables the above.

[0015]

In order to achieve the above-mentioned object, according to the present invention, a shaft for rotatably supporting a second member rotatable relative to a first member is connected to the second member. The combined hollow shaft main body, the cap member engaged with the first member and rotatably inserted into the end of the shaft main body, and the cap member inserted into the shaft main body by contacting the outer peripheral surface thereof. The torsion spring has one end engaged with the shaft body and the other end engaged with the cap member, and viscous grease sealed between the shaft body and the cap member. One of the two ends of the torsion spring is engaged. It is characterized in that it is engaged non-rotatably and the other is engaged with a gap capable of idling.

The present invention may further include a torsion bar inserted into the torsion spring and having one end engaged with the shaft body and the other end engaged with the cap member. In this case, the torsion spring is provided outside the torsion bar. It has a double structure.

Further, the present invention may be of a serial structure in which a torsion spring and a torsion bar are positioned in the axial direction. In this case, the torsion spring is inserted into the cap member by bringing the outer peripheral surface into contact with the cap member, and one end of the cap member is provided. The other end is engaged with the cap member, and the torsion bar is inserted into the shaft main body, one end is engaged with the shaft main body, and the other end is engaged with the cap member. This is the same as the above-described present invention.

It is preferable that the torsion spring of the present invention is inserted into the shaft main body or the cap member while being twisted in the diameter reducing direction.

[0019]

The shaft body and the cap member are first and second, respectively.
And one of the first and second members rotates about the pivotal support portion with respect to the other member. This rotation is performed over a region on both sides of the neutral point of the rotating member. During this rotation, one of the shaft body and the cap member rotates integrally with the rotating member, and the other is attached to the fixed member with the rotation restricted.

In this case, when only the torsion spring is used, the torsion spring is twisted via the shaft body or the cap member by the closing operation from the neutral point of the rotating member, and the flip-up torque of the rotating member is accumulated. This bouncing torque is maximum at the fully closed point. The opening operation of the rotating member from the fully closed point to the neutral point is performed by the jumping torque, but at a slow speed due to the shear resistance of viscous grease sealed between the shaft body and the cap member.

When the rotating member reaches the neutral point, the outer surface of the torsion spring comes into contact with the shaft body or the cap member, and the rotation of the rotating member at the neutral point is prevented by the frictional force due to the contact.

Further, the opening operation after the neutral point is performed by an external force load which overcomes the frictional force caused by the contact between the outer surface of the torsion spring and the shaft body or the cap member. The direction in which the rotating member rotates due to the external force load is the direction in which the diameter of the torsion spring is expanded, and the expanded diameter is restricted by the shaft main body or the cap member.

For this reason, the opening operation of the rotating member after the neutral point is performed without any twisting of the torsion spring in the idle space where the end of the torsion spring is engaged, and the rotating member reaches the full open point.

When the external force applied to the rotating member is released between the neutral point and the fully open point, the rotating member stops at an arbitrary position by frictional force caused by the contact between the outer surface of the torsion spring and the shaft body or the cap member. Free stop area.

Further, the closing operation from the fully open point to the neutral point is performed by twisting the torsion spring in the diameter reducing direction, so that it can be performed with a small external force and the above-described free stop function can be obtained.

In the apparatus using the torsion spring and the torsion bar, the above-mentioned jumping torque is obtained by the combined force of the two, and the free stop from the neutral point to the fully open point is provided between the outer surface of the torsion spring and the shaft body or the cap member. Obtained by frictional force due to contact.

When the torsion spring is inserted into the shaft main body or the cap member in a state of being twisted in the diameter reducing direction, an initial torque is applied to the torsion spring to obtain a high jumping torque, and at the same time, the torsion spring is connected to the shaft main body or the cap member. High frictional force is obtained in between.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on first to third embodiments shown in the drawings. In the embodiments, the same elements as those in the conventional example will be described with the same reference numerals.

1 to 4, a shaft body 3 of the first embodiment has a hollow shaft body 31 and a cap member rotatably inserted on both sides of the shaft body 31 in the same manner as the above-described conventional shaft body. 32 and 33; a torsion spring 4 having one end hook portion 41 engaged within the shaft body 31 and the other end hook portion 42 engaged within the cap member 33;
The viscous grease 5 enclosed between 2 and 33 is roughly constituted.

The shaft main body 31 is formed of a stepped shaft having small diameter shaft portions 31b and 31b for rotatably externally inserting cap members 32 and 33, respectively, on both sides of a central large diameter shaft portion 31a. A circular hole 34 having one end closed and the other end opened is formed in the shaft body 31 in the axial direction, and a key 35 is provided outside the large-diameter shaft portion 31a. As shown in FIG. 4, an arc-shaped groove 31d is formed in which a hook portion at one end of a torsion spring 4 to be described later engages with a gap capable of idling.

The cap members 32 and 33 are connected to the shaft main body 3.
The cap member 33 is formed of a cylindrical body having a bottom and is externally inserted into the small-diameter shaft portion 31b. A mating engagement hole 33a is formed.

The cap members 32 and 33 have the same outer diameter as the large-diameter shaft portion 31a of the shaft main body 31, and keys 37 and 38 are formed on the outside. The cap members 32 and 33 are rotatably assembled to the shaft main body 31 by extrapolating to the small-diameter shaft portions 31b and 31b, respectively.

The viscous grease 5 is applied to the cap members 32 and 33.
Is applied to the outer surfaces of the small-diameter shaft portions 31b and 31b at the time of the above-mentioned extrapolation, and sealed between the cap members 32 and 33 and the small-diameter shaft portions 31b and 31b by extrapolation of the cap members 32 and 33.

In this assembled state, the torsion spring 4 is inserted into the circular hole 34 of the shaft main body 31, the one end hook portion 41 is engaged with the arc-shaped groove 31d, and the other end hook portion 42 is connected to the shaft main body 31. It is pulled out from the circular hole 34 and is engaged with the engaging hole 33 a of the cap member 33 to be assembled in the shaft 3.

The outer diameter of the torsion spring 4 is larger than the diameter of the circular hole 34 of the shaft main body 31 in a free state, and the torsion spring 4 is inserted into the circular hole 34 in a state of being twisted in the diameter reducing direction. It is. Therefore, in the assembled state, the outer peripheral surface of the torsion spring 4 is in contact with the inner peripheral wall of the shaft main body 31 with some resilient force.

The shaft body 3 thus assembled is attached to the pivotal support of the opening / closing device 60 shown in FIGS. 5 to 9 to form a slow rotating shaft device.

In the opening / closing device 60, the rotating member 1 is rotatably supported around the shaft 3 with respect to the fixed member 2. The rotating member 1 is formed at one end face with a shaft support portion 11 through which the shaft body 3 can be inserted, and the upper surface of the shaft support portion 11 has a tapered surface 1.
2 and a stopper surface 13 is formed on the top end surface of the tapered surface 12.

Further, bearings 21 and 22 are formed on the fixed member 2 so as to sandwich the shaft support 11 of the rotating member 1, and a stopper surface of the rotating member 1 is formed on an end face of the bearing 21 and 22 on the forming side. A contact surface 23 against which the abutment 13 abuts is formed. For this reason, in the opening and closing device 60, the rotation of the rotating member 1 is restricted by the stopper surface 13 abutting against the contact surface 23 through the neutral point in FIG. It becomes fully open. At this time, the rotation angle α from the fully closed state to the fully opened state of the rotating member 1 is approximately 135 °.

The shaft 3 is inserted into a pivotal part of the rotating member 1 at a neutral point of the rotating member 1. That is, as shown in FIG. 8, the rotary member 1 is erected substantially vertically so that the insertion holes and the key grooves provided in the bearing portions 21 and 22 of the fixed member 2 and the shaft support portion 11 of the rotary member 1 are aligned. Then, the shaft 3 is passed through the insertion hole, and the key 3 of the cap member 32 is
7 in the key groove of the bearing portion 22, the key 35 of the shaft main body 31 in the key groove of the shaft support portion 11, and the key 38 of the cap member 33.
The shaft body 31 and the cap members 32, 33 are attached to the rotating member 1 and the fixed member 2, respectively, by fitting them into the key grooves of the bearing portion 21. At this time, the key grooves of the bearing portions 21 and 22 formed integrally with the fixing member 2 are formed in a shape corresponding to the keys 37 and 38 of the cap members 32 and 33, and the bearing portions 21 and 22 of the keys 37 and 38 are formed. Of the cap member 3 by fitting the
2 and 33 are mounted on the bearing portions 21 and 22 in a non-rotatable state.

Next, the operation of this embodiment will be described. When the rotating member 1 is located at the neutral point (FIG. 8), one end hook portion 41 of the torsion spring 4 is located at one end in the arc-shaped groove 31d as shown in FIG. It is engaged while remaining.

When the rotating member 1 is rotated from the neutral point in the closing direction (direction C) in FIG.
It rotates together with the rotating member 1 in the direction. The torsion spring 4 is twisted by the rotation of the rotating member 1 in the closing direction, and energy for rotating the rotating member 1 in the opening direction is accumulated. The diameter of the torsion spring 4 is reduced by being twisted, and the abutment of the outer peripheral surface on the inner wall of the shaft main body 31 is released. And it will be in the fully closed state shown in FIG. In this fully closed state, the rotating member 1
The fully closed state is maintained by an appropriate locking means (not shown).

When the lock of the rotating member 1 in the fully closed state is released, the rotating member 1 rotates in the opening direction by the torque of the torsion spring 4. The rotation at this time causes shear resistance of the viscous grease 5 and is performed at a slow speed irrespective of the torque load of the torsion spring 4. Thus, the rotating member 1 stops near the neutral point in FIG. This stop is accurately stopped without swinging by the frictional force generated when the outer peripheral surface of the coil spring 4 comes into contact with the inner wall of the shaft main body 31.

The rotation of the rotating member 1 in the opening direction after the neutral point is manually performed. An external force that overcomes the frictional force generated between the outer peripheral surface of the coil spring 4 and the inner wall of the shaft main body 31 is applied to the rotating member 1 stopped near the neutral point, and further rotated in the opening direction. The rotation of the shaft body 31 at this time is indicated by F in FIG.
And the shaft body 31 idles with respect to the torsion spring 4. That is, the link between the shaft main body 31 and the torsion spring 4 is such that the one end hook portion 41 of the torsion spring 4 is
The rotation of the shaft main body 31d in the F direction is performed by moving only the shaft main body 31 while the torsion spring 4 is maintained at the neutral position. By the rotation of the shaft body 31, the other end of the arc-shaped groove 31d comes into contact with one end hook portion 41 of the torsion spring 4, and the subsequent rotation in the opening direction expands the torsion spring 4 through the one end hook portion 41. Since the diameter is increased, the frictional force generated between the torsion spring 4 and the shaft main body 31 increases, and the rotation is prevented. When the other end of the arc-shaped groove 31d is in contact with the hook portion 41 at one end, the rotating member 1 is in the fully opened state shown in FIG.

In the region from the neutral point to the fully open point, the external force applied to the rotating
Can be stopped at an arbitrary position by a frictional force generated between the outer peripheral surface of the torsion spring 4 and the inner wall of the shaft main body 31.

When the rotating member 1 is rotated in the closing direction from the fully opened state, the rotation in the same direction is a direction in which the diameter of the torsion spring 4 is reduced, so that the rotating member 1 is closed with an external force smaller than the opening direction. Can be done. By the closing operation of the rotating member 1, the shaft main body 31 rotates in the direction opposite to the F direction, and one end of the arc-shaped groove 31 d is connected to one end hook portion 41 of the torsion spring 4.
Abut. In this state, the rotating member 1 has reached the neutral point shown in FIG.

Next, a second embodiment will be described with reference to FIGS. The second embodiment is obtained by adding a torsion bar 7 to the first embodiment. The torsion bar 7 is inserted into the torsion spring 4 to form a double structure, and one end hook portion 71 is engaged with the shaft main body 31 and the other end hook portion 72 is engaged with the cap member 33 so as to be inserted into the shaft body 3. It is installed. For this purpose, a slit-shaped hole 31e is formed in the closing portion 31c of the shaft main body 31 so that the one-end hook portion 71 of the torsion bar 7 is engaged.
Is formed with a slit-like hole 33b with which the other end hook portion 72 of the torsion bar 7 engages. The other structure is the same as that of the first embodiment.

In the second embodiment, the jumping torque of the rotating member 1 is obtained by the resultant force of the torsion spring 4 and the torsion bar 7. Other operations are the same as in the first embodiment, and the area from the neutral point to the fully open point of the rotary member 1 is reduced to the reaction force of the torsion bar 7 by the frictional force caused by the contact between the outer peripheral surface of the torsion spring 4 and the inner wall of the shaft body 31. Nevertheless, it is a free stop area.

Further, based on FIG. 13 to FIG.
An embodiment will be described. The third embodiment has a series structure in which the torsion spring 4 and the torsion bar 7 of the second embodiment are assembled in series. In this embodiment, the shaft main body 31 is used.
Is the second diameter of the small-diameter shaft portion 31b on the cap member 32 side.
The cap member 3 is formed shorter than that of the embodiment.
When the second member 2 is extrapolated to the small diameter shaft portion 31b, a gap 8 is formed between the bottom of the cap member 32 and the closed portion 31c of the shaft main body 31.

The torsion spring 4 is inserted into the space 8,
One end hook portion 41 is engaged with an arc-shaped groove 32a formed in the bottom of the cap member 32 with a gap capable of idling (see FIG. 15), and the other end hook portion 42 is inserted into the cap member 32. The small-diameter shaft portion 31b is non-rotatably engaged with an engaging groove 31f provided in the axial direction on the outer surface of the end of the small-diameter shaft portion 31b. At this time, the outer diameter of the torsion spring 4 is larger than the inner diameter of the cap member 32 in a free state, and the torsion spring 4 is inserted into the cap member 32 in a state of being twisted in the diameter reducing direction. Therefore, after the insertion, the outer peripheral surface of the torsion spring 4 is in contact with the inner wall of the cap member 32.

As in the second embodiment, the torsion bar 7 has one end hook portion 71 engaged with a slit hole 31e formed in the closing portion 31c of the shaft body 31, and the other end hook portion 72 connected to the slit of the cap member 33. It is attached so as to engage with the hole 33b.

A cylindrical projection 31g having a diameter smaller than that of the small-diameter shaft portion 31b and capable of being inserted into the torsion spring 4 is provided in the closed portion 31c of the small-diameter shaft portion 31b in the axial direction. Is provided with a cylindrical projection 32b having the same diameter as the cylindrical projection 31g. This cylindrical projection 31g, 3
2b is inserted into the torsion spring 4 when the cap member 32 is assembled to the small diameter shaft portion 31b to prevent the torsion spring 4 from buckling. The other structure in this embodiment is the same as that in the first embodiment.

In the third embodiment, the jumping torque of the rotating member 1 is obtained by the combined force of the torsion spring 4 and the torsion bar 7, and the free stop in the region from the neutral point to the fully open point of the rotating member 1 is a torsion spring. 4 and the inner wall of the cap member 32.

In the present embodiment, the opening operation from the neutral point to the fully open point is performed by the shaft main body 31 which rotates together with the rotating member 1.
, The torsion spring 4 rotates. At this time, the rotation of the torsion spring 4 is such that the hook portion 41 only moves in the arc-shaped groove 32a, and is not twisted at all.

The second and third embodiments described above operate on the rotating member 1 in the same manner as the first embodiment.

[0055]

As described above, according to the present invention, the first
From the fully closed state to the neutral point, the rotating member as the second member that rotates with respect to the fixed member as the member at a slow speed due to the torsion spring or the spring force of the torsion spring and the torsion bar and the shear resistance of the viscous grease. In addition to being able to rotate, the area from the neutral point to the fully open point can be set as a free stop area by a frictional force generated between the torsion spring and the shaft body or the cap member.

Further, in the present invention, since the torsion spring is inserted into the shaft body or the cap member in a state where the torsion spring is twisted in the diameter reducing direction, an initial torque is applied to the torsion spring. Bouncing torque is obtained. Therefore, the rotating member can be reliably jumped up to the neutral point.

Further, the swinging of the rotating member at the neutral point can be prevented by the frictional force generated between the torsion spring and the shaft body or the cap member, and a highly reliable switching device can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a shaft constituting a slow-rotating shaft device according to a first embodiment of the present invention.

FIG. 2 is a left side view of the shaft body of FIG. 1;

FIG. 3 is a sectional view taken along line III-III of FIG.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 1;

FIG. 5 is a front view of an opening / closing device to which the shaft body of FIG. 1 is attached.

FIG. 6 is a side view of the opening / closing device of FIG. 5;

FIG. 7 is a side view of the opening / closing device of FIG. 5;

8 is an operation explanatory view of the opening and closing device of FIG. 5;

FIG. 9 is an operation explanatory view of the opening and closing device of FIG. 5;

FIG. 10 is a longitudinal sectional view of a shaft constituting a slow-moving rotary shaft device according to a second embodiment of the present invention.

FIG. 11 is a sectional view taken along line XI-XI of FIG. 10;

12 is a sectional view taken along line XII-XII in FIG.

FIG. 13 is a longitudinal sectional view of a shaft constituting a slow-moving rotary shaft device as a third embodiment of the present invention.

14 is a sectional view taken along line XIV-XIV of FIG.

15 is a sectional view taken along line XV-XV in FIG.

FIG. 16 is a perspective view of a main part of the shaft body of FIG. 13;

FIG. 17 is a perspective view of an opening / closing device equipped with a conventional slow rotation shaft device.

FIG. 18 is an exploded cross-sectional view of a shaft constituting a conventional slow rotation shaft device.

FIG. 19 is a right side view of one cap member constituting the shaft body of FIG. 18;

FIG. 20 is a sectional view taken along line bb of FIG. 18;

FIG. 21 is a left side view of the other cap member constituting the shaft of FIG. 18;

FIG. 22 is an operation explanatory view of the opening / closing device of FIG. 17;

23 is a characteristic diagram illustrating a relationship between a rotation angle and a torque of a rotating member of the switching device of FIG. 17;

[Explanation of symbols]

 3 Shaft 4 Torsion Spring 5 Viscous Grease 7 Torsion Bar 31 Hollow Shaft Main Body 32 Cap Member 33 Cap Member 41 One Hook (Torsion Spring) 42 Other Hook (Torsion Spring) 71 One Hook (Torsion Bar) 72 Other End Hook (torsion bar) 31d Arc-shaped groove 32a Arc-shaped groove 60 Opening / closing device

Claims (4)

(57) [Claims] A shaft member rotatably supporting a second member which rotates relative to the first member; a hollow shaft body engaged with the second member; and an end portion of the shaft body. A cap member rotatably inserted and engaged with the first member, and inserted into the shaft body by bringing the outer peripheral surface into contact with the shaft body, and one end is engaged with the shaft body and the other end is engaged with the cap member, respectively. It consists of a torsion spring and viscous grease sealed between the shaft main body and the cap member, and the engagement of both ends of the torsion spring is such that one of them is non-rotatably engaged and the other is an idle space. A slow rotating shaft device having and being engaged. 2. The slowly rotating shaft device according to claim 1, further comprising a torsion bar inserted into the torsion spring, one end of which is engaged with the shaft body, and the other end of which is engaged with the cap member. . 3. A shaft body rotatably supporting a second member rotatable relative to the first member, a hollow shaft body engaged with the second member and an end of the shaft body. A cap member rotatably inserted and engaged with the first member, a cap member inserted into the cap member by contacting an outer peripheral surface thereof, one end of the cap body being inside the cap member, and the other end being a cap member A torsion spring inserted into the shaft main body, one end of which is engaged with the shaft main body, and the other end of which is engaged with the cap member, and viscous grease sealed between the shaft main body and the cap member. Wherein the two ends of the torsion spring are engaged in a non-rotatable manner, and the other is engaged with an idling gap. 4. The slack motion according to claim 1, wherein the torsion spring is inserted into the shaft body or the cap member in a state of being twisted in a diameter decreasing direction. Rotary axis device.