JPH09291957A - Rotary damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of breakage even when a further load in the spreading direction exceeding an ordinary rotational angle range is applied on a cover body. SOLUTION: A first rotary shaft 3 is charged in a body case 2 through viscous liquid with which a space between a peripheral surface and the inner surface of a body case 2 is filled liquid-tightly. The first rotary shaft 3 is energized in one direction in a normal state by a first elastic member 6 disposed in the body case 2 and rotatable in a range of a given rotation angle. A second rotary shaft 4 having one end disposed in a state to protrude externally from the body case 2 and working as an output end is coupled to a first rotary shaft 3 through a second elastic member 7 not energized in any direction in a normal state. The second rotary shaft 4 is rotated in a range of the rotational angle of the first rotary shaft 3 togetherwith the first rotary shaft 3, and when the second rotary shaft is rotated outside the range of the rotary angle of the first rotary shaft 3, it is rotated independently as the second elastic member 7 is twisted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary damper having a shaft body that functions as a rotary shaft of a rotary lid, a rotary door, or the like that opens and closes by rotating.

[0002]

2. Description of the Related Art Conventionally, so-called laptop-type or notebook-type personal computer display parts, toilet seats and toilet lids of western-style toilets, bush button covers of folding mobile phones, etc. It is provided so as to rotate up and down, for example, in the range of about 90 degrees to about 150 degrees to open and close. In this case, in order to delay the opening operation or the closing operation, it has a shaft body connected to the lid body or the main body, and the peripheral surface of this shaft body and the inner surface of the case holding the shaft body. A rotary damper having a viscous liquid filled between and is used.

[0003]

By the way, of the above-mentioned lids, for example, a push button cover of a mobile phone is lightweight when it is provided so as to be opened by about 150 degrees. Therefore, when the cover is expanded, it may be accidentally opened beyond the expansion range of about 150 degrees. In addition, there is a case where a hand is accidentally caught on the cover during a call, and the cover is expanded more than necessary. If it has been expanded beyond the specified angle, when using it again,
The expansion angle may not be set to a predetermined angle, or the rotary damper itself may be destroyed, resulting in failure to perform its function at all. This is caused not only by the foldable mobile phone whose cover itself is lightweight, but also by the user erroneously applying an unnecessarily heavy load to the cover of the above-mentioned laptop personal computer, western style toilet, etc. There is a risk.

Not only when the user applies an excessive load with his / her hands or the like, but also when the mobile phone or laptop personal computer is accidentally dropped on the floor, the ground or the like, the telephone or the personal computer itself. The function of the rotary damper may be impaired as well as the function of.

The present invention has been made in view of the above, and it is possible to prevent damage even when a further load is applied to the lid in the expanding direction beyond the normal rotation angle range. An object is to provide a rotary damper that can be used.

[0006]

In order to achieve the above object, the rotary damper of the present invention includes a viscous liquid that is hermetically filled in the body case between the peripheral surface and the inner surface of the body case. A first rotating shaft that is loaded and is urged in one direction in a normal state by a first elastic member arranged in the main body case, and is rotatable within a predetermined rotation angle range;
One end is disposed so as to project outward from the main body case and acts as an output end, and the other end is rotated by a second elastic member that is not normally biased in any direction. Is connected to the shaft and rotates together with the first rotating shaft within the range of the rotating angle of the first rotating shaft, and when the rotating angle of the first rotating shaft exceeds the range of the rotating angle of the first rotating shaft, the second elastic member is twisted alone. And a second rotation shaft that rotates at.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the figure, reference numeral 1 is a rotary damper of the present embodiment, which is configured to have a main body case 2, a first rotary shaft 3, and a second rotary shaft 4.

The main body case 2 is formed in a substantially cylindrical shape as shown in FIG. A first rotating shaft 3 and a second rotating shaft, which will be described later.
The rotary shaft 4 is housed inside the main body case 2, and caps 21 and 22 are provided at both ends to prevent the first rotary shaft 3 and the second rotary shaft 4 from coming off. .

As shown in FIGS. 1, 3 and 4, the first rotating shaft 3 is formed in a substantially cylindrical shape, and a partition wall portion 3a is provided inside the first rotating shaft 3, and one cylindrical portion 32 is provided. And the other cylindrical portion 33. An end portion 51 of a fixed shaft 5, which will be described later, is inserted into the one cylindrical portion 32, and the first rotary shaft 3 is rotatable relative to the fixed shaft 5. The outer diameter of one tubular portion 31 near the end is smaller than the outer diameter of the other portion of the one tubular portion 31, while two projections 31a and 31b are provided at a predetermined angle ( 2 (b) and 4
(C)). Corresponding to the two protrusions 31a and 31b, by providing a projecting wall 2a that projects inward in the circumferential direction with a predetermined width inside the main body case 2 (see FIG. 2B), The protrusions 31a, 3 are provided on both end faces in the circumferential direction of 2a.
By contacting the outer end surface of 1b, the range of the rotation angle of the first rotation shaft 3 is regulated. In addition, each protrusion 31a, 31
One end portion 61 of a first elastic member 6 described later is fixed to the inner end surface of any of the protrusions 31a and 31b between the points b and b (see FIGS. 1, 2B, and 2C). The other tubular portion 32 is provided for arranging a second rotating shaft 4 described later, as shown in FIG.
As shown in FIGS. 3 and 4B, a small-diameter cylindrical portion 32a, a medium-diameter cylindrical portion 32b, and a large-diameter cylindrical portion 32c are formed in order from the center side.

As shown in FIGS. 3 and 5, the second rotating shaft 4 is divided into a cylindrical portion 41 and a prismatic portion 42 with a substantially central portion as a boundary. A slender cylindrical projection 41a is provided on the inside of the wall portion of the cylindrical portion 41 along the axial center.
A groove 41b is engraved between the wall portion and the cylindrical protrusion 41a. Then, the cylindrical protrusion 41a and the small diameter cylindrical portion 32a formed in the other cylindrical portion 32 of the first rotating shaft 3 and the medium diameter cylindrical portion 3 are formed.
2b, and the cylindrical portion 41 is arranged in the large-diameter cylindrical portion 32c (see FIGS. 1 and 3). In addition, the circumference of the cylindrical protrusion 41 a and the other tubular portion 32 of the first rotating shaft 3
In a normal state, the second elastic member 7 is provided in a gap formed between the small-diameter cylindrical portion 32a and the medium-diameter cylindrical portion 32b, and in a groove 41b surrounded by the wall portion of the cylindrical portion 41 communicating with the clearance. It is arranged so that the biasing force is not applied in any direction (see FIG. 1). It should be noted that the one end portion 71 of the second elastic member 7 is the small diameter tubular portion 3 of the other tubular portion 32 of the first rotating shaft 3.
2a and a columnar protrusion 41a are located in the gap and are fixed with respect to the first rotating shaft 3, and the other end 72 passes through a groove 41b surrounded by the cylindrical portion 41 and the prismatic portion 42. It is located in the mounting groove 42a that is carved into the inside and is fixed to the second rotating shaft 4.

Here, the large diameter cylindrical portion 32c of the first rotating shaft 3
As shown in FIG. 2A and FIG. 3, an arcuate protrusion 33 is provided in the inside thereof so as to protrude in the circumferential direction over a range of a predetermined angle (about 90 degrees in the present embodiment). . Also,
On the other hand, the cylindrical portion 41 of the second rotary shaft 4 is provided with the step portion 43 over a range of a predetermined angle (about 230 degrees in the present embodiment) in the circumferential direction. Then, as described above, when the cylindrical protrusion 41a is arranged so as to be located in the small diameter cylindrical portion 32a and the cylindrical portion 41 is arranged in the large diameter cylindrical portion 32c, as shown in FIG. The arcuate protrusion 33 and the step 43 are arranged so as not to overlap each other. As a result, as will be described later, when the first rotating shaft 3 rotates, the arcuate protrusion 4 is formed.
The one end surface 43a of the third contact member 3 abuts on the one end surface 33a of the step portion 33 to rotate the second rotating shaft 4 in synchronization with the first rotating shaft 3.

The fixed shaft 5 has a medium-diameter columnar portion 52 and a small-diameter columnar portion 53 formed on the right side in FIG. 6C and FIG. A large-diameter cylindrical portion 54 and a prismatic portion 55 are formed in the. Then, as shown in FIG. 1, in the main body case 2, the small-diameter columnar portion 53 is provided with the one cylindrical portion 31 of the first rotating shaft 3.
It is inserted and arranged inside. A first elastic member 6 is arranged in a gap formed by the medium-diameter columnar portion 52 and the main body case 2. The first elastic member 6 is arranged so as to be twisted so as to be biased in one direction in a normal state, one end portion 61 thereof is fixed to the first rotating shaft 3, and the other end portion 62 thereof is fixed to the fixed shaft 5. It is inserted and fixed at an appropriate position of the groove 56 formed. In addition, the prismatic portion 55 is the main body case 2 described above.
The fixed shaft 5 is provided so as not to rotate with respect to the main body case 2 by being arranged so as to fit into the hole 22a formed in the cap 22. As shown in FIG. 1, an O-ring 8 for preventing liquid leakage is arranged around the large-diameter cylindrical portion 54, and an O-ring 9 arranged around the first rotating shaft 3 is provided. Between the inner surface of the main body case 2 and
The viscous liquid (not shown) is filled in a slight gap formed between the outer surfaces of the first rotating shaft 3 and the fixed shaft 5.

The rotary damper 1 according to this embodiment is used as follows. A description will be given based on FIG. First, the second
The prismatic portion 42, which is the protruding end of the rotary shaft 4, is connected to a bearing (not shown) provided at the base end of a control object, for example, a push button cover (not shown) of a mobile phone. . At this time, while the push button cover is closed, the first elastic member 6 is twisted and given a predetermined urging force, while the second elastic member 7 is not attached with any force. Set it so that it has no power. The push button cover is provided with an arbitrary lock mechanism (not shown) that engages with the main body (not shown) of the mobile phone.

When using a mobile phone, the lock mechanism is released. As a result, the urging force of the first elastic member 6 causes the first rotating shaft 3 to start rotating in the X direction in FIG. At this time, the first rotary shaft 3 rotates slowly due to the viscous resistance of the viscous liquid filled around the first rotary shaft 3. In the present embodiment, the rotation angle is about 1 until the outer end surface of the protrusion 31b provided on the first rotating shaft 3 comes into contact with the end surface of the protruding wall 2a of the main body case 2 as shown in FIG. 2 (b).
The protrusions 31a and 31b and the both protrusions 3 are arranged at 50 degrees.
The relationship between the length in the circumferential direction of the gap between 1a and 31b and the length of the protruding wall 2a of the main body case 2 in the circumferential direction is set. When the first rotating shaft 3 rotates in the X direction, the arcuate protrusion 33 formed on the first rotating shaft 3
Since one end surface 33a of the second contact portion contacts the one end surface 43a of the step portion 43 provided on the second rotating shaft 4, the second rotating shaft 4 rotates together with the first rotating shaft 3 (see FIG. 2A). . In order to allow the second rotary shaft 5 to rotate at the same time when the first rotary shaft 3 starts to rotate in the expanding direction (X direction), that is, to eliminate the play, the closed state described above is used. 2A, the one end surface 33a of the arcuate protrusion 33 and the one end surface 43a of the step portion 43 are set to be in contact with each other.

Therefore, at the same time when the first rotary shaft 3 starts to rotate in the X direction, the second rotary shaft 4 also rotates, and the push button cover, which is an object to be controlled, opens to a predetermined angle. Normally, a mobile phone is used in this state.

At this time, when a load is further applied in the expanding direction (X direction), the other end surface 4 of the step 43 is formed.
3b is the other end surface 33b of the arcuate projection 33 of the first rotary shaft 3.
Only the second rotating shaft 4 rotates independently until it comes into contact with. As a result, the second elastic member 7 is twisted. The range of the independent rotation angle of the second rotation shaft 4 is rotated even if the object to be controlled, such as a mobile phone, is pressed by a flat plate (for example, the surface of a desk) or dropped. Assuming that the damper 1 is not damaged, it is preferable that the range in which the damper 1 rotates together with the first rotating shaft 3 is about 40 degrees when it is about 150 degrees as in the present embodiment. That is, from the closed state to the first rotary shaft 3
The angle of rotation together with the angle of rotation of the second rotation shaft 4 alone is about 180 degrees, and the margin is 190 degrees.
Degree is preferable. As a result, even if the mobile phone is pressed against a flat desk surface or the like, the rotary damper 1 can be prevented from being damaged only by expanding the mobile phone about 180 degrees. Note that the controlled object is not a mobile phone,
In the case of a laptop personal computer or the like, the preferred rotation angle in a normal use state also differs, so that the independent rotation angle range of the second rotation shaft 4 can be set appropriately according to the control target.

When the force urging only the second rotary shaft 4 alone in the expanding direction is released, the second elastic member 7 is twisted, and therefore the second rotation is performed simultaneously with the release. The shaft 4 is moved in the closing direction (Y direction) by the restoring force of the second elastic member 7.
Until the one end surface 43a of the step portion 43 comes into contact with the one end surface 33a of the arcuate projection 33 of the first rotating shaft 3, that is,
In the present embodiment, the rotation angle from the closed state is about 1
Rotate alone to the 50 degree position.

When the push button cover is pressed by a hand or the like in the closing direction after the use of the mobile phone as the control object is finished, one end face 43a of the step portion 43 provided on the second rotating shaft 4 is Arc-shaped projection 33 provided on the first rotating shaft 3
Since the one end surface 33a of the first rotary shaft 3 is pressed, the first rotary shaft 3 also rotates in the Y direction together and returns to the closed state. As a result, the protrusion 31a formed on the first rotating shaft 3 returns until it comes into contact with the protruding wall 2a of the main body case 2.

The rotary damper of the present invention is not limited to the above embodiment. For example, in the above-described embodiment, the coil springs are shown as the first and second elastic members as shown in the drawings, but any elastic member may be used as long as it has the same function. Further, although the fixed shaft 5 is provided and the other end of the first elastic member 6 is fixed to the fixed shaft 5, the fixed shaft 5 is not provided and the first elastic member 6 is fixed to the main body case 2. The other end may be fixed directly.

[0020]

According to the rotary damper of the present invention, even if the lid of the object to be controlled is expanded by a certain angle by a certain angle or more, that is, the normal use range or more,
Since the second rotary shaft has a structure that rotates relatively independently of the first rotary shaft, it is possible to prevent the rotary damper itself from being damaged.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a rotary damper of the present invention.

2A is a sectional view taken along line AA of FIG. 1, FIG. 2B is a sectional view taken along line BB of FIG. 1, and FIG. 2C is a sectional view taken along line CC of FIG.

FIG. 3 is an exploded perspective view showing an arrangement relationship between a first rotating shaft, a second rotating shaft, and a third rotating shaft.

FIG. 4 is a view showing a structure of a first rotating shaft, (a)
Is a left side view, (b) is a sectional view taken along the line D-D of (a), (c)
Is a right side view.

FIG. 5 is a view showing a structure of a second rotating shaft, (a)
Is a left side view, (b) is a right side view, (c) is an E- of (a).
A sectional view taken along the line E, and a sectional view taken along the line FF in (a).

6A and 6B are views showing the structure of a fixed shaft, in which FIG. 6A is a left side view, FIG. 6B is a right side view, FIG. 6C is a front view, and FIG. 6D is a sectional view taken along line GG of FIG. It is a figure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotation damper 2 Main body case 3 1st rotation shaft 4 2nd rotation shaft 5 Fixed shaft 6 1st elastic member 7 2nd elastic member

Claims (2)

[Claims] 1. A first elastic member which is mounted in a main body case via a viscous liquid which is hermetically filled between a peripheral surface and an inner surface of the main body case and which is arranged in the main body case. And a first rotation shaft that is normally urged in one direction and is rotatable in a predetermined rotation angle range, and is arranged so that one end thereof projects outward from the main body case and acts as an output end. , The other end is connected to the first rotation shaft via the second elastic member that is not normally biased in any direction, and the first rotation is within the range of the rotation angle of the first rotation shaft. And a second rotating shaft which rotates together with the shaft and rotates independently while twisting the second elastic member when the rotation angle of the first rotating shaft is equal to or more than the range of the rotation angle of the first rotating shaft. 2. The first elastic member has one end fixed to a fixed shaft fixedly arranged in the main body case and the other end fixedly arranged to the first rotating shaft. The described rotary damper.