JP2906316B2 - Rotary damper such as lift hinge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door mounting body such as a cabinet pivotally mounted on a door mounting body such that the door is opened upward by rotation and using a tension spring or the like to reduce the opening and closing forces. Link (lever crank mechanism) to obtain
And the like, which is mounted on a section thereof, so as to obtain a resistance to the above-mentioned opening and closing forces by utilizing the pressure of the hydraulic oil, and to buffer the movement of the door by the resistance. The present invention relates to a rotary damper that exerts an action, that is, a braking force.

[0002]

2. Description of the Related Art Conventionally, as a rotary damper of this kind,
As shown in FIG. 8, the housing a and the housing a
A blade shaft b having a blade c that slides on the inner wall surface a ′, a fixed blade d fixed and mounted on the outer peripheral side of the blade c, and a fixed blade d disposed on one side of an oil passage hole e of the fixed blade d. A check valve f provided, an upper fixed shaft and a lower fixed shaft (not shown) for rotatably holding the blade shaft b in the housing a, and two housings a vertically partitioned by the blade c. There are known chambers each including g and h and a hydraulic oil i filled therein.

According to the rotary damper having the above structure, when the blade shaft b is rotated clockwise in the drawing, the check valve f is opened by receiving the pressure of the hydraulic oil i. Since the oil i flows into the other chamber h from the one chamber g via the oil hole e, the hydraulic oil i does not generate a resistance as a damper effect.

Next, when the blade shaft b is rotated in the counterclockwise direction, the check valve f is closed by receiving the pressure of the hydraulic oil i, whereby the hydraulic oil i is transferred from the other chamber h. Oil passage hole e
Does not flow into one of the chambers g, the hydraulic pressure in the other chamber h increases, and a resistance by the hydraulic oil i occurs,
A damper effect is exerted on the external force of the blade shaft b.

[0005]

However, in the conventional rotary damper of this type, as described above, the forward and reverse rotations of the blade shaft and the like exhibit a damper effect only in one direction rotation by an external force. As described above, these are connected to a lift hinge or the like by means of a four-bar link in which a door opening force and a door closing force can be obtained by a tension spring or the like as described above so that a damper effect is exerted in the door closing direction. When used, the damper force is exerted as a braking force against the door load and door closing force, and the door is closed slowly, but the damper effect is exhibited in the opening direction of the door In order to prevent the door from being closed, it has the lower end of the door, pivots upward toward the front against the door closing force, and opens the door halfway through the branch point between the opening force and the closing force by the tension spring. Get away from If there is a Unako, it may be dangerous at the time of opening become that the door is suddenly opened by the door opening force. In addition, at the time of the opening, an excessive force due to an impact is applied to the mounting portion of the door and the door mounting body by the lift hinge, and as a result, rattling or breakage occurs at the mounting portion. Also.

The present invention has been made in view of the above problems of the prior art, and is a rotary damper which can be used for a lift hinge or the like, and has a large damper force within a range of opening and closing angles of a door. The door can be opened and closed slowly, as well as by changing the direction in which the damper force is exerted. It is an object of the present invention to make it possible to perform a simple operation on a single axis and to achieve such a change in operation of the door.

[0007]

SUMMARY OF THE INVENTION The present invention aims at the intended purpose.
In order to achieve the target, the following problem solving means is characterized.
That is, a rotary damper such as a lift hinge according to the present invention.
Are two members that rotate relative to each other when subjected to external force.
A housing and a movable shaft are provided.
With the outer ring and the inner movable shaft inside
And facing each other within the housing
Of the circumferential surface on the housing side and the circumferential surface on the movable shaft side,
On one of the peripheral surfaces, a fulcrum for rotation is provided on the one peripheral surface side.
Or had a length that reached the other peripheral surface
A pair of symmetrical movable valves are spaced apart in the circumferential direction.
The movable valve is in contact with the other
And the housing and movable shaft
Either along the radial direction inside the housing
That a partition portion for partitioning is formed, and
These partitions and a pair of movable valves were divided into two chambers.
Both chambers in the housing are filled with hydraulic oil,
And corresponding to the above one peripheral surface with a pair of movable valves
Between the above-mentioned other peripheral surface and the hydraulic oil
For communicating both chambers in the housing with each other
Is interposed, and the pair of movable valves and the passage
Both movable valves open and close the passage in a relative relationship.
And one peripheral surface having a pair of movable valves
The part of the other peripheral surface facing
For opening a movable valve having a circumferential length corresponding to the interval of
The ribs are protruding and are held by the one member
Movable valve and the movable valve
In the relative relationship with the corresponding other member, the one member
The movable valve that rotates forward and backward with the
The movable valve enters the valve opening operation state when
If the movable valve that rotates forward and reverse with one member
When descending, the movable valve closes due to hydraulic oil pressure.
It is characterized by being in an operating state.

[0008]

A description will now be given of an embodiment in which a pair of movable valves are pivotally mounted on a movable shaft, and ribs are projected from an outer peripheral surface of a housing. When the external force is applied to the movable shaft as a rotational force, and the movable shaft is rotated, the pair of movable valves pivoted to the movable shaft are also rotated in the same direction. When the movable shaft is rotated in one direction, for a pair of movable valves, the movable valve on the rotation direction side is on the rib, and the movable valve on the opposite side is in contact with the outer peripheral surface of the housing. The interior of the housing is vertically partitioned by both movable valves, and of the two chambers filled with hydraulic oil, the hydraulic oil in one of the two chambers is one movable valve riding on the rib, The fluid flows into a passage formed between the outer peripheral surface of the housing and the other movable valve is pressed by the pressure of the hydraulic oil, and is rotated outward, that is, in a direction away from the outer peripheral surface of the housing. Is formed between them. In other words, the other movable valve is in a valve-opening operation state, whereby the hydraulic oil in one chamber flows into the other chamber through the passage and the gap. Does not occur.

When the movable shaft is rotated in one direction by a predetermined angle, the pair of movable valves are also rotated in the same direction, one of the movable valves is moved from the rib to the outer peripheral surface of the housing, and It is pressed under the pressure of the hydraulic oil, rotates inward, comes into close contact with the outer peripheral surface of the housing, and enters a valve closing state. As a result, the hydraulic oil in one chamber does not flow into the other chamber through the outer peripheral surface of the housing and the one movable valve, so that the hydraulic pressure in one chamber increases,
A resistance force is generated by the hydraulic oil, and a damper effect is exerted on the external force of the movable shaft.

At this time, the other movable valve rides on the rib and is in a so-called valve-opening state in which a passage is formed between the movable valve and the outer peripheral surface of the housing. The hydraulic oil in one chamber flows into the other chamber through a gap between the outer peripheral surface of the movable shaft and the inner peripheral surface of the housing, or a small amount of hydraulic oil is formed in a partition wall that vertically partitions the inside of the housing. Through the holes, the hydraulic oil in one chamber flows into the other chamber, but the gaps and small holes are
Since the hydraulic oil is formed to have an appropriate size in advance, the flow rate of the hydraulic oil becomes small, and a constant resistance can be obtained.

In the above state, when an external force is applied to the movable shaft as a rotational force in the other direction, the movable shaft is rotated in the other direction with a pair of movable valves. Since the valve is in the valve-opening operation state, the hydraulic oil in the other chamber flows into the passage formed between the other movable valve and the outer peripheral surface of the housing, and the one movable valve is pressed. The housing is rotated outward to form a gap between the housing and the outer peripheral surface of the housing. In other words, one of the movable valves is in a valve-opening operation state, whereby the hydraulic oil in the other chamber flows into the one chamber through the passage and the gap, so that the resistance as a damper effect by the hydraulic oil is reduced. Does not occur.

When the movable shaft is rotated by a predetermined angle in the other direction, the other movable valve rides on the outer peripheral surface of the housing from above the rib, and is pressed by receiving the pressure of the hydraulic oil in the other chamber, and is directed inward. , And comes into close contact with the outer peripheral surface of the housing, so that the valve is closed. As a result, the hydraulic oil in the other chamber does not flow into the one chamber through the outer peripheral surface of the housing and the other movable valve, so that the hydraulic pressure in the other chamber increases, and a resistance force due to the hydraulic oil is generated. Exerts a damper effect against external forces.

At this time, the one movable valve rides on the rib, and a so-called valve opening operation state is formed in which a passage is formed between the movable valve and the outer peripheral surface of the housing. Preparations are made for rotation.

In the above, the case where the movable shaft is provided with a pair of movable valves and the rib is provided on the outer peripheral surface of the housing, and the case where the housing is fixed and the movable shaft is rotated has been described. In the case where a rib is provided on the outer peripheral surface of the movable shaft, and a pair of movable valves are provided inside the housing, the movable shaft may be fixed and the housing may be rotated. The effect is achieved.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. In the first embodiment shown in FIGS. 1 (A) to 1 (D) to FIG. 3, the housing 1 is formed in a substantially concave shape in longitudinal section by a bottom wall 1a and a peripheral wall 1b, and an inner surface of the bottom wall 1a. From the center,
The cylindrical portion 1c is integrally erected lower than that of the peripheral wall 1b by an appropriate dimension, and as shown in FIG.
On one side of the cylindrical portion 1c, a partition wall 1d whose lower end is continuous with the bottom wall 1a is vertically installed integrally with the cylindrical portion 1c at the same height as the cylindrical portion 1c. Is divided vertically.

The movable shaft 2 is a short columnar portion 2a having an outer diameter aligned so as to be rotatable in the housing 1.
And a downwardly extending portion from the lower end of the columnar portion 2a and having a substantially new moon shape in cross section, and the outer surface thereof is formed into an arc surface 2c having the same curvature as the inner peripheral surface 1e of the housing 1. It is formed integrally with a support portion 2b having movable valves 3, 4 described later. The support part 2b
The vertical length of the cylinder 1 is the cylindrical portion 1 of the housing 1 described above.
It is formed identically to that of c.

A pair of two bearing recesses 2d and 2e for pivotally mounting the movable valves 3 and 4 are provided inside the support portion 2b of the movable shaft 2 and near both ends in the width direction thereof. The housing 1 has a substantially semicircular shape and is vertically installed so as to open toward the cylindrical portion 1c of the housing 1.

A pair of movable valves 3, 4 separately prepared
Are cylindrical shaft portions 3a, 4a at the base end thereof.
And the wing-shaped valve portions 3b, 4b protruding in the radial direction from one side of the shaft portions 3a, 4a, so that the pair of movable valves 3, 4 are symmetrical to each other. Is formed. The two movable valves 3 and 4 are supported by the support portion 2b of the movable shaft 2 such that the shaft portions 3a and 4a are rotatable around the axis by fitting the shaft portions 3a and 4a into the bearing recesses 2d and 2e. Thus, by rotating together with the movable shaft 2, the valve portions 3b, 4b are brought into sliding contact with the outer peripheral surface 1f of the cylindrical portion 1c of the housing 1.

The valve portions 3b, 4 of the movable valves 3, 4
The inner surface of b is provided on the arcuate surfaces 3c and 4c, so that the distal end portions of the arcuate surfaces 3c and 4c can slide freely on and off the outer peripheral surface 1f of the cylindrical portion 1c. And it is arranged so that it may contact the outer peripheral surface 1f at a required inclination angle.

Further, the cylindrical portion 1 of the housing 1 described above.
c, the partition wall 1
A rib 5 for opening both the movable valves 3 and 4 is circumferentially long and integrally protruded from a lower portion on the side opposite to d. The rib 5 has a circumferential length substantially equal to the interval between the pair of movable valves 3 and 4.
Slowly inclined surfaces 5a, 5b are formed at both ends in the circumferential direction so that the movable valves 3, 4 can rotate smoothly with respect to the upper surface of the rib 5 by rotating forward and backward together with the movable shaft 2. Have been.

The movable valve 3, 4 rides on the upper surface which is the outer periphery of the rib 5, whereby the movable valve 3, 4
As shown in FIG. 2, a passage 6 for a hydraulic oil C, which will be described later, is formed between the cylinder 4 and the outer peripheral surface 1f of the cylindrical portion 1c.
The width in the up-down direction is set to be smaller than that of the movable valves 3 and 4 by a required dimension. That is, the rib 5
The movable valves 3 and 4 are provided so that the movable valves 3 and 4 are opened in the circumferential direction together with the movable shaft 2.

Therefore, the housing 1 and the movable shaft 2
First, as shown in FIGS. 2 and 3, the movable shaft cylindrical portion 2
a of the annular concave portion 2f on the outer periphery of the
gO-rings on the annular recesses 2h at the lower edge
Then, the movable shaft 1 is inserted into the housing 1.
Rotatably and airtightly fit into the housing cylinder
The connecting shaft is connected to the shaft hole 1g of the portion 1c and the shaft hole 2g of the movable shaft 2.
How to insert and fit 9 from below to rotate around each other
It is to be assembled so that it can rotate freely. in this way
When the housing 1 and the movable shaft 2 are assembled,
The interior of the housing 1 includes the partition wall 1d and the two movable valves 3, as described above.
4 separates two chambers A and B. So both rooms
A and B are filled with hydraulic oil C. Ward in this case
The drawing wall 1d partitions the inside of the housing 1 along its radial direction.
Partitioning part for housing, and integrated with housing 1
It is clear that this is a partition formed in the above.

Then, when the pair of operating valves 3 and 4 are rotated together with the movable shaft 2 in the counterclockwise direction indicated by the arrow D in FIG. The side surface receives the pressure of the hydraulic oil C inside the chamber A, and the movable valve 3 is pressed in the counterclockwise direction. However, the movable valve 3 is in a state of riding on the rib 5. Therefore, the valve 6 is maintained in the valve-opening state in which the passage 6 is formed between the valve portion 3b and the outer peripheral surface 1f of the cylindrical portion 1c of the housing 1. As a result, the hydraulic oil C inside the chamber A flows into the passage 6, whereby the other movable valve 4 which is in contact with the outer peripheral surface 1f of the cylindrical portion 1c is moved to the inner circular surface 4c. , The movable valve 4 is pressed outward and rotates counterclockwise, and the valve portion 4b is opened from the outer peripheral surface 1f of the cylindrical portion 1c to open the valve. The valve 3 slides on the upper surface of the rib 5, and the other movable valve 4 slides on the outer peripheral surface 1 f of the cylindrical portion 1 c, and the state shown in FIG. It flows inside.

When the movable valves 3 and 4 are rotated together with the movable shaft 2 in the direction indicated by arrow D from the state shown in FIG. 1B, as shown in FIG. The valve moves from the upper surface of the rib 5 to the outer peripheral surface 1f of the cylindrical portion 1c, and the valve is closed. At this time, the other movable valve 4 rides on the upper surface which is the outer periphery of the rib 5 and enters the valve opening operation state in which the above-described passage 6 is formed. As a result, the outer surface of one of the movable valves 3 receives the pressure of the hydraulic oil C inside the chamber A, and is rotated in the counterclockwise direction, so that the tip of the valve portion 3a becomes the outer peripheral surface of the cylindrical portion 1c. 1f to be in a valve closing operation state, and the hydraulic oil inside the chamber A does not flow into the chamber B,
One movable valve 3 slides on the outer peripheral surface 1f of the cylindrical portion 1c, and the other movable valve 4 slides on the upper surface which is the outer periphery of the rib 5, respectively.
The state shown in FIG.

When the pair of movable valves 3 and 4 are rotated together with the movable shaft 2 in the clockwise direction shown by the arrow E in the same figure from the state shown in FIG. 1D, the other movable valve 4 is rotated. Is rib 5
Since it is on the upper side and is in the valve-opening state, the hydraulic oil C inside the chamber B flows into the passage 6 between the movable valve 4 and the cylindrical portion 1c, whereby one movable valve 3 is moved outside. And is rotated clockwise, so that a gap is formed between the valve portion 3b and the outer peripheral surface 1f of the cylindrical portion 1c. The hydraulic oil C inside the chamber B flows into the chamber A through this gap.

When the pair of movable valves 3 and 4 are rotated clockwise together with the movable shaft 2, the state shown in FIG. 1C is obtained. When rotated in the rotation direction, as shown in FIG. 1B, the other movable valve 4 moves onto the outer peripheral surface 1f of the cylindrical portion 1c from above the rib 5, and the movable valve 4 has an outer peripheral surface that The valve 4b is pressed and rotated clockwise by receiving the pressure of the operating oil C inside the chamber B, and the valve portion 4b is brought into close contact with the outer peripheral surface 1f of the cylindrical portion 1c to be in a valve closing operation state. The hydraulic oil C does not flow into the chamber A from between the outer peripheral surface 1 f of the cylindrical portion 1 c and the movable valve 4, and the movable valve 4 covers the outer peripheral surface 1 f of the cylindrical portion 1 c, and one movable valve 3 is the upper surface of the rib 5. Respectively, and returns to the state of FIG.

When the movable shaft 2 is fixed and the housing 1 is rotated, the movable valve 3 is closed by rotating the housing 1 in the direction of arrow E in FIG. State, and the other movable valve 4 enters the valve opening operation state.

Further, in order to make the hydraulic oil C inside the chambers A and B flow only a small amount mutually, FIGS.
As shown in (D), a small hole 1h is formed in the partition wall 1d of the housing 1, and a small gap (not shown) is formed between the inner wall surface 1e of the housing 1 and the arc surface 2c of the support 2b of the movable shaft 2. Further, both the small hole 1h and the gap are provided.

FIG. 4 is a cross-sectional view of the second embodiment. Here, from one side of a peripheral wall 1b of a housing 1, a support portion 10 for pivotally mounting a pair of movable valves 3 and 4 is integrally directed inward. And a pair of two bearing recesses 10a,
A pair of movable valves 3 and 4 are rotatably provided in parallel with a predetermined interval in the circumferential direction at predetermined intervals in the circumferential direction, and are supported by being symmetrically fitted.

On the other hand, the movable shaft 2 is
A cylindrical portion 11 having a small diameter is integrally formed at the center of the lower end of the cylindrical portion 11, and a plate-shaped partition wall 11a for vertically partitioning the inside of the housing 1 is formed on one side of the outer periphery of the cylindrical portion 11. And the end surface thereof is integrally provided so as to slide on the inner peripheral wall 1e of the housing 1 and is provided on the outer peripheral surface 11b of the cylindrical portion 11 so that the partition wall 1a
On the opposite side, the valve-opening ribs 5 of the movable valves 3 and 4 are circumferentially long, and the length in the vertical direction is set shorter than that of the movable valves 3 and 4 to integrally project. Have been.

In the embodiment shown in FIG .
The interior of the housing 1 includes a pair of movable valves 3, 4 and the partition wall 11a.
Inside the housing 1
Has two chambers A and B as in the previous example. these
Both chambers A and B are also filled with hydraulic oil C. So hydraulic oil
To allow C to flow a small amount between the two chambers A and B, a small hole 11c
Is formed on the partition wall 11a. In addition,
A small gap is formed between the inner wall surface 1 e of the housing 1 and the partition wall 11.
a. In the embodiment of FIG.
Partition wall 11a extends in the housing 1 along its radial direction.
The movable shaft 2
It is clear that this is a partition formed in the body. FIG.
The description is omitted for other items in the embodiment.
This is formed in the same manner as in the first embodiment.
You.

FIG. 5 is a cross-sectional view of the third embodiment. In this embodiment, a supporting portion 2b of the movable shaft 2 which is suspended from one lower end of a columnar portion 2a has a substantially semicircular cross section. In the central part of the inner surface, an arc-shaped concave surface 2g slidably contacting the outer peripheral surface 1f of the cylindrical portion 1c of the housing 1 in close contact with the inner surface.
Is installed vertically.

The curvature of the arc surface 2c, which is the outer surface of the support portion 2b, is set smaller than that of the inner wall surface 1e of the housing 1, and is formed in a non-contact state with the inner wall surface 1e. The surface 2c has two bearing recesses 2
d, 2c are vertically installed in parallel at a predetermined interval in the circumferential direction, and by fitting the shaft portions 3a, 4a into the bearing recesses 2d, 2c, the pair of two movable valves 3, 4 is directed outward. Symmetric,
The valve portions 3b and 4b are rotatably supported by the support portion 2b so as to be slidable on the inner wall surface 1e of the housing 1.

Further, a rib 5 for opening the two movable valves 3 and 4 is provided on the inner wall surface 1e of the housing 1 and is long in the circumferential direction and has a length in the vertical direction. 4
When the movable valves 3 and 4 ride on the ribs 5, the movable valves 3 and 4 and the inner wall 1 e of the housing 1 are formed between the movable valves 3 and 4. A passage (not shown) for the hydraulic oil C is formed. Except as described above, the structure is the same as that of the first embodiment.

FIG. 6 shows an example in which the rotary damper of the present invention is mounted on one section of a lift hinge consisting of a four-section link and used as a flap door. As shown in the figure, the rotary damper is configured such that ends of a long link 14 and a short link 15 are respectively connected to a fixed link 12 and a movable link 13 by a pin 1.
The housing 1 is fixed to the fixed link 12 of the lift hinge 17 which is rotatably formed by being pivotally connected at 6, 16, and 16, and one end of the short link 15 and the movable shaft 2 are connected. By fixing, it is attached to a section of the lift hinge 17.

The fixed link 12 is provided on a side plate 18a of a door mounting body 18 such as a cabinet, and is fixed to an upper inner surface thereof with a screw 19 °. By fixing with ‥‥‥,
The door 20 is pivotally provided so that the opening 18b of the door mounting body 18 can be freely opened and closed by rotation.

In the illustrated example, one end of a link 23 at the upper end of the movable link 13, the upper end of which is rotatably connected to the door 20 by a pin 22, A tension spring 24 is stretched between the lower portions, and the door opening and closing forces are applied to the door 20 by the spring force.

In this manner, when the door 20 attached to the door attachment body 18 is rotated upward from the closed position shown by the solid line in the figure and opened, the short link 15 is closed. From the position (a), the movable shaft 2 is rotated counterclockwise by the link 15 with respect to the housing 1 fixed to the fixed link 12 by rotating the movable shaft 2 counterclockwise as indicated by the arrow F. At this time, the state is changed from (A) to (B) in FIG. 1, and as described above, since one movable valve 3 is in the valve-opening operation state, the hydraulic oil C inside the chamber A becomes the chamber B And the damper force is not applied, so that the door 20 is opened lightly.

The door 20 is opened from a closed position to a predetermined angle against the closing force of the tension spring 24, and is opened to a position slightly beyond a branch point between the opening force and the closing force by the spring 24. After that, the door is opened by the door opening force.

When the short link 15 is rotated to the illustrated switching point (C) by opening the door 20, FIG.
As shown in (1), one of the movable valves 3 moves onto the outer peripheral surface 1f of the cylindrical portion 1c from above the rib 5 to be in a valve closing operation state, and the hydraulic oil C flows between the movable valve 3 and the outer peripheral surface 1f of the cylindrical portion 1c. Since the flow does not flow, the outer working oil C flows into the partition wall 1 of the housing 1.
d flows into the chamber B from the chamber A through the small hole 1h formed in the hole d. However, since the flow rate of the hydraulic oil C flowing through the small hole 1h is small, a damper force acts, and the door 20 slowly opens and moves. Then, the short link 15 rotates to the illustrated door opening position (d), and the door 20 is opened. In the open state, as shown in FIG. 1D, the other movable valve 4 rides on the rib 5 and is kept in the valve open state.

When a force in the closing direction is applied to the door 20 at the opened position against the door opening force, the movable shaft 2 moves the movable valves 3, 4.
Is rotated in the direction of arrow E in FIG. 1 (D), but since the other movable valve 4 is in the valve-opening state, the passage 6 is passed between the movable valve 4 and the outer peripheral surface 1f of the cylindrical portion 1c. Hydraulic oil C flows into the chamber A from the chamber B, whereby no damping force is applied, so that the door 20 is closed against the door opening force.

Further, when the door 20 is closed and the short link 15 is rotated to the switching point (b) shown in FIG. 6, the valve is in an open state as shown in FIG. 1 (C). The other movable valve 4 transfers from the rib 5 to the outer peripheral surface 1f of the cylindrical portion 1c as shown in FIG.
Is closed by receiving the pressure of the operating oil C in the chamber B, and a passage 6 is provided between the movable valve 4 and the outer peripheral surface 1f of the cylindrical portion 1c.
Is no longer formed, the hydraulic oil C flows into the small holes 1 in the partition wall 1d.
h flows into the chamber A from the chamber B, but the flow rate of the hydraulic oil C flowing through the small hole 1h is small, so that a damper force acts, and the door 20 is gradually slowed against the closing force of the tension spring 24. , The short link 15 rotates to the illustrated closed position (a), and the door 20 is closed.

FIG. 7 is a graph showing a change in damper force when the door is opened and closed, and a change in operation such as switching, and FIG. 7A shows ON / OFF and switching operation of the damper force in the use example shown in FIG. Changes in the damper force and operations such as switching are shown in the figures other than the curve a by changing the length, width and shape of the rib 5 and the shape of the movable valves 3 and 4. It is possible to perform a complicated operation as shown by the solid thin line b, the broken line c, and the two-dot chain line d.

[0044]

Since the present invention is constructed as described above, it can be used for a lift hinge or the like to provide a damper O in the closing direction near the closing of the door.
N, damper OFF in the opening direction, and near the opening of the door, damper ON in the opening direction, damper OFF in the closing direction, damper OFF in the middle of opening and closing, and changes in damper force such as switching, etc. Can be opened and closed lightly while the door is being opened and closed.In addition, when the door is opened and closed, the door can be opened and closed. The opening and closing movements can be performed slowly, so that the danger at the time of opening and closing can be eliminated.
A complicated operation can be obtained by changing the width, shape, shape of the movable valve, and the like, and the above-described complicated operation change is performed simply, easily, and inexpensively by a single shaft with a movable shaft fitted to the housing. can do.

[Brief description of the drawings]

1A and 1B show a first embodiment of a rotary damper such as a lift hinge according to the present invention, wherein FIG. 1A shows a closed state, FIG. 1B shows a state near a closed door, FIG. () Is each cross-sectional view of the door open state.

FIG. 2 is a cross-sectional view taken along line AA ′ in FIG.

FIG. 3 is a sectional view taken along line BB ′ in FIG. 1 (B).

FIG. 4 is a cross-sectional view showing a second embodiment of the rotary damper according to the present invention.

FIG. 5 is a cross-sectional view showing a third embodiment of the rotary damper according to the present invention.

FIG. 6 is a vertical sectional side view showing an example of use of the rotary damper.

FIG. 7 is a graph showing a change in rotational damper force, an operation change, and the like in the rotary damper.

FIG. 8 is a cross-sectional view showing a conventional example of a rotary damper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 1f Outer peripheral surface 2 Movable shaft 3 Movable valve 4 Movable valve 5 Rib 6 Passage A chamber B chamber C Hydraulic oil

──────────────────────────────────────────────────の Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16F 9/12-9/14 F16F 9/48 E05D 7/086 H05K 5/03

Claims (1)

(57) [Claims] 1. Two parts which rotate relatively when subjected to an external force
It has a housing and a movable shaft as materials, and these two members
Relative rotation with housing outside and movable shaft inside
Mated and facing each other within the housing
Between the peripheral surface of the housing and the peripheral surface of the movable shaft
Of which, one of the peripheral surfaces is used for turning to the one peripheral surface side.
Fulcrum or the length reaching the other peripheral surface
Two pairs of symmetrical movable valves are spaced in the circumferential direction
And these movable valves are
And the housing can be freely contacted.
One of the movable shafts has a radius inside the housing.
A partition part for partitioning along the direction is formed,
And, these partitions and a pair of movable valves are divided into two chambers.
Both chambers in the housing are filled with hydraulic oil.
And the one peripheral surface having a pair of movable valves.
Between the other peripheral surface and the hydraulic oil
To allow both chambers in the housing to communicate with each other.
Path and the pair of movable valves and the
Both movable valves open and close the passage in relation to the passage.
And having a pair of movable valves
A part of the other peripheral surface facing one peripheral surface includes
A movable valve having a circumferential length corresponding to the interval between movable valves
The opening rib is projected, and the one side is
A pair of movable valves held by
In the relative relationship with the other member corresponding to the touch,
The movable valve that rotates forward and reverse with one member is
When the movable valve is in the valve-opening state when
The movable valve that rotates forward and backward with one member is
When the movable valve descends from the
A rotary damper such as a lift hinge, wherein the rotary damper is brought into a valve closing operation state .