JPH0763235A - Rotation damper for lift hinge and the like - Google Patents

Abstract

PURPOSE:To realize the change of the magnitude of damper force or the switching of ON-OFF by a single shaft simple constitution by means of a rotary damper such as a lift hinge, etc., wherein damper effect can be displayed by resisting force by hydraulic oil. CONSTITUTION:A pair of two movable valves 3 and 4, engaged rotatably with a movable shaft 2 to be symmetrically arranged, is slidably contacted with the outer peripheral surface 1f of a housing 1. At the time of the normal or reverse rotation at a given angle of the movable shaft 2, the movable valve 3 or 4 is closely fitted to the outer peripheral surface 1f due to the pressure- receiving by hydraulic oil (c) to become a valve-closed action condition to display damper effect against the rotation of the movable shaft 2. At the time of normal or reverse rotation within the given angle of the movable shaft 2, since both the movable valves 3 and 4 are mounted on a rib 5 protrudedly provided on the outer peripheral surface if, a passage is formed between both the movable valves 3 and 4 and the outer peripheral surface if to flow the hydraulic oil (c) between two chambers A and B to act no damper force by hydraulic oil (c).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a door opening force and a door closing force which are pivotally attached to a door mounting body such as a cabinet so that the door can be opened upward and upward by rotating and a tension spring or the like is used. Four-bar link (Lever crank mechanism)
Lift hinges, etc., which are attached to a section of the lift hinge by using the hydraulic oil pressure to obtain resistance against the door opening force and door closing force, and buffer the movement of the door by the resistance force. 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 this type of rotary damper,
As shown in FIG. 8, a housing a and this housing a
Blade blade b having a blade c that slides on the inner wall surface a ′ of the blade, a fixed blade d fixedly arranged on the outer peripheral side of the blade c, and a fixed blade d arranged on one side of an oil passage e of the fixed blade d. A check valve f, an upper fixed shaft and a lower fixed shaft (not shown) that rotatably hold the blade shaft b in the housing a, and two blades c that vertically partition the inside of the housing a. It is known that each chamber g and h is provided with a hydraulic oil i filled therein.

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

Next, when the blade shaft b is rotated counterclockwise, the check valve f receives the pressure of the hydraulic oil i and closes, whereby the hydraulic oil i is discharged from the other chamber h. Oil passage e
Since it does not flow into the inside of the one chamber g via the, the hydraulic pressure in the other chamber h increases and a resistance force is generated by the hydraulic oil i.
The damper effect is exerted against the external force of the blade axis b.

[0005]

However, in the existing rotary damper of this type, as described above, the damper effect is exerted only when the blade shaft or the like rotates normally or reversely due to the external force. As described above, a lift hinge etc. with a four-bar link that can obtain the opening and closing forces by the tension spring etc. as described above is used so that the damper effect is exerted in the door closing direction. When used, the damper force is exerted as the braking force against the door load and the door closing force, and the door is closed slowly, but the damper effect is exerted in the door opening direction. Therefore, in the closed state, the door has the lower end and rotates upward toward the door against the closing force, and the door is opened during the opening beyond the branch point between the opening force and the closing force by the tension spring. Move 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. Further, at the time of the opening, an unreasonable force due to 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 damage may occur at the mounting portion. Also becomes.

The present invention has been made in view of the above problems of the prior art, and is a rotary damper that can be used for a lift hinge or the like, and the magnitude of the damper force within the range of the opening and closing angle of the door. To allow the door to be opened and closed slowly, as well as various other complicated things. It is an object of the present invention to enable such various movements and to achieve such movement change of the door with a simple configuration on one axis.

[0007]

In order to achieve the above-mentioned object, the present invention comprises a housing and a movable shaft which are rotatably fitted to each other by an external force, and one member of which is:
A pair of two movable valves, which slide on the outer peripheral surface of the other member by rotation, are symmetrically fitted and arranged at regular intervals in the circumferential direction so that the movable valves can rotate freely. Direction is divided into two chambers, each of which is defined in the circumferential direction, is filled with hydraulic oil, and when the pair of movable valves is rotated together with one member, the rotation direction of the other valve causes the other of the other members to rotate. A passage for operating oil for the two chambers is formed between the movable valve and the outer peripheral surface which are operated in a valve opening operation state separated from the outer peripheral surface and are in the valve opening operation state. Ribs are provided so as to project in the circumferential direction of the outer peripheral surface with a length substantially equal to the distance between the pair of movable valves, and the pair of movable valves contact the outer peripheral surface of the other member. Of the external force And rolling toward the direction, it is intended to provide a rotary damper, such as a lift hinge being characterized in that as the pressure of the hydraulic oil is added.

[0008]

An embodiment will be described in which a pair of movable valves are pivotally mounted on a movable shaft and ribs are projected on the outer peripheral surface of the housing. When an external force is applied as a rotational force to the movable shaft to rotate the movable shaft, a pair of movable valves pivotally attached to the movable shaft also rotate in the same direction. When the movable shaft is rotated in one direction, the movable valve on the rotation side of the pair of movable valves is on the rib, and the movable valve on the opposite side is in contact with the outer peripheral surface of the housing. The inside of the housing is vertically partitioned by both movable valves, and the hydraulic oil in one chamber of the two chambers filled with hydraulic oil is one movable valve that is riding on the rib. It flows into a passage formed between the outer peripheral surface of the housing and the pressure of this hydraulic oil presses the other movable valve to rotate it outward, that is, in a direction away from the outer peripheral surface of the housing. A gap is formed between and. In other words, the other movable valve is in the valve-opening operation state, whereby the hydraulic oil in one chamber flows into the other chamber through the passage and the gap, so that the resistance force as a damper effect by the hydraulic oil is reduced. Does not happen.

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, and one of the movable valves is transferred from above the rib onto the outer peripheral surface of the housing so that one chamber is moved. It is pressed by the pressure of the hydraulic oil, rotates inward, makes close contact with the outer peripheral surface of the housing, and enters the valve closing operation 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 operation state in which a passage is formed between the movable valve and the outer peripheral surface of the housing. Also, the hydraulic oil in one chamber flows into the other chamber through the gap between the outer peripheral surface of the movable shaft and the inner peripheral surface of the housing, or a small partition wall that vertically partitions the interior of the housing is provided. The hydraulic oil in one chamber flows into the other chamber through the holes, but the gap and small holes are
Since the hydraulic oil is formed to have an appropriate size in advance, the flow rate of the hydraulic oil is small and a constant resistance force 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 the pair of movable valves, but the other movable valve is a rib. Since it is in the valve-opening operation state in which it climbs up, 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. And is rotated toward the outside to form a gap with the outer peripheral surface of the housing. In other words, one of the movable valves is in the 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 force as a damper effect by the hydraulic oil is reduced. Does not happen.

When the movable shaft is rotated by a certain angle in the other direction, the other movable valve rides on the rib from the outer peripheral surface of the housing, is pressed by the pressure of the hydraulic oil in the other chamber, and is directed inward. It rotates and comes into close contact with the outer peripheral surface of the housing, and 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 is generated by the hydraulic oil. The damper effect is exerted against the external force of.

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

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

[0015]

The present invention will be described below with reference to the illustrated embodiments. In the first embodiment of FIGS. 1 (A) to 1 (D) to FIG. 3, the housing 1 is formed by the bottom wall 1a and the peripheral wall 1b in a substantially concave shape in vertical cross section, and the inner surface of the bottom wall 1a is formed. From the center,
The cylindrical portion 1c is integrally erected so as to be lower than that of the peripheral wall 1b by an appropriate size, and as shown in FIG.
A partition wall 1d whose lower end is connected to the bottom wall 1a is vertically provided on one side of the cylindrical portion 1c so as to have the same height as that of the cylindrical portion 1c, and the interior of the housing 1 is defined by the partition wall 1d. Is vertically partitioned.

The movable shaft 2 has a short cylindrical portion 2a having an outer diameter which is rotatably aligned in the housing 1.
And, the columnar portion 2a is hung downward from one side of the lower end and has a cross-section of a substantially new moon shape, and its outer surface is 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 and 4 which will be described later. The supporting portion 2b
The vertical length of the cylindrical portion 1 of the housing 1 is
It is formed the same as 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. They are formed in a substantially semicircular shape and are vertically arranged in parallel so as to open toward the cylindrical portion 1c side of the housing 1.

A pair of separately prepared movable valves 3, 4
Is a cylindrical shaft portion 3a, 4a at the base end portion thereof.
And a pair of blade-shaped valve portions 3b and 4b protruding from one side of the shaft portions 3a and 4a in the radial direction, the pair of movable valves 3 and 4 are symmetrical to each other. Is formed in. The two movable valves 3 and 4 are supported by the support portion 2b of the movable shaft 2 so as to be rotatable in the axial direction by fitting the shaft portions 3a and 4a into the bearing recesses 2d and 2e. As a result, 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 by being rotated together with the movable shaft 2.

Further, the valve portions 3b and 4 of the movable valves 3 and 4 are
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 slidably contact the outer peripheral surface 1f of the cylindrical portion 1c. Further, it is arranged so as to contact the outer peripheral surface 1f at a required inclination angle.

Further, the cylindrical portion 1 of the housing 1 described above
In the outer peripheral surface 1f in c, the above-mentioned partition wall 1
A rib 5 for opening the movable valves 3 and 4 is provided in a lower portion on the side opposite to d so as to integrally project so as to be long in the circumferential direction. The length of the rib 5 in the circumferential direction is set to be substantially equal to the distance between the pair of movable valves 3 and 4,
Slowly sloping surfaces 5a and 5b are formed at both ends in the circumferential direction so that both movable valves 3 and 4 are normally rotated and reversely rotated together with the movable shaft 2 so that the movable valves 3 and 4 can smoothly get on and off the upper surface of the rib 5. Has been done.

Further, the movable valve 3, 4 is mounted on the upper surface which is the outer periphery of the rib 5, so that the movable valve 3,
4 and the outer peripheral surface 1f of the cylindrical portion 1c, as shown in FIG.
The width in the vertical direction is set smaller than that of the movable valves 3 and 4 by a required dimension. That is, the rib 5
Is provided so that the movable valves 3 and 4 are rotated in the circumferential direction together with the movable shaft 2 so that the movable valves 3 and 4 are brought into the valve opening operation state.

Therefore, as shown in FIGS. 2 and 3,
In the movable shaft 2, an annular recess 2f is provided on the outer periphery of the cylindrical portion 2a, and an annular recess 2h is provided at the lower end opening edge of the shaft hole 2g provided at the center of the cylindrical portion 2a. With the respective O-rings 7 and 8 fitted in, the movable shaft 2 is rotatably fitted in the housing 1 and fitted in an airtight state, and is fitted into the central shaft hole 1g in the cylindrical portion 1c of the housing 1. , The connecting shaft 9 is inserted from below, and the tip end thereof is attached to the movable shaft 2
By fitting in the shaft hole 2g of the housing 1 and the movable shaft 2
And are assembled so that they can rotate about their axes.
The interior of the cylinder 1 is vertically partitioned by the movable valves 3 and 4 into two chambers A and B, and these chambers A and B are filled with hydraulic oil C.

Therefore, when the pair of actuating valves 3 and 4 together with the movable shaft 2 are rotated 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, but the movable valve 3 is in a state of riding on the rib 5. Therefore, the valve opening state is maintained 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 in contact with the outer peripheral surface 1f of the cylindrical portion 1c has an arcuate surface 4c inside thereof. Receives the pressure of the hydraulic oil C, the movable valve 4 is pushed outward and rotates counterclockwise, and the valve portion 4b is opened from the outer peripheral surface 1f of the cylindrical portion 1c to be in the valve opening operation state, so that one movable The valve 3 slides on the upper surface of the rib 5, and the other movable valve 4 slides on the outer peripheral surface 1f of the cylindrical portion 1c, resulting in the state of FIG. 1B, and the hydraulic oil C inside the chamber A is stored in the chamber B. Flows into the interior.

When the movable valves 3 and 4 are rotated together with the movable shaft 2 in the direction indicated by the arrow D from the state shown in FIG. 1B, as shown in FIG. From the upper surface of the rib 5 onto the outer peripheral surface 1f of the cylindrical portion 1c, 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 the one movable valve 3 receives the pressure of the hydraulic oil C inside the chamber A, and is rotated counterclockwise, and the tip of the valve portion 3a is the outer peripheral surface of the cylindrical portion 1c. The valve closes in close contact with 1f, and the hydraulic oil inside chamber A does not flow into 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,
The state shown in FIG. 1D is obtained.

Further, 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 of FIG. 1D, the other movable valve 4 is moved. Rib 5
Since it is on the upper side and is in the valve opening operation 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 to the outside. It is pressed to rotate clockwise and a gap is formed between the valve portion 3b and the outer peripheral surface 1f of the cylindrical portion 1c, and the hydraulic oil C inside the chamber B flows into the chamber A through this gap.

By rotating the pair of movable valves 3 and 4 together with the movable shaft 2 in the clockwise direction, the state shown in FIG. 1C is obtained, and from this state, the movable valves 3 and 4 are further rotated together with the movable shaft 2. When the movable valve 4 is rotated in the rotating direction, as shown in FIG. 1B, the other movable valve 4 is transferred from above the rib 5 to the outer peripheral surface 1f of the cylindrical portion 1c. When the pressure of the hydraulic oil C in the chamber B is received, the valve portion 4b is pressed and rotated clockwise, 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 1f of the cylindrical portion 1c and the movable valve 4, the movable valve 4 is the outer peripheral surface 1f of the cylindrical portion 1c, and one movable valve 3 is the upper surface of the rib 5. To slide to return to the state of FIG.

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

Further, in order to allow the hydraulic oils C in the chambers A and B to flow in a small amount with each other, the flow shown in FIGS.
As shown in (D), a small hole 1h is formed in the partition wall 1d of the housing 1, and a narrow gap (not shown) is formed between the inner wall surface 1e of the housing 1 and the circular arc surface 2c of the support portion 2b of the movable shaft 2. Further, both the small hole 1h and the gap are provided.

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

On the other hand, the movable shaft 2 has the above-mentioned cylindrical portion 2a.
A cylindrical portion 11 having a small diameter is integrally formed so as to hang down at the center of the lower end of the, 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. Direction, and the end surface of the partition wall 1a is integrally formed so as to be slidably in contact with the inner peripheral wall 1e of the housing 1 and is located on the outer peripheral surface 11b of the cylindrical portion 11.
On the opposite side, the valve opening ribs 5 of the movable valves 3 and 4 are long in the circumferential direction, and the length in the up-down direction is set shorter than that of the movable valves 3 and 4 described above so as to integrally project. Has been done.

Further, the inside of the housing 1 is designed so that a small amount of the hydraulic oil C filled in the two chambers A and B vertically partitioned by the pair of movable valves 3 and 4 flows between the chambers A and B. A small hole 11c is formed in the partition wall 11a, and a narrow gap (not shown) is formed between the inner wall surface 1e of the housing 1 and the end surface of the partition wall 11a. Except for what has been described above, the structure is the same as that of the first embodiment.

FIG. 5 is a transverse cross-sectional view of the third embodiment, in which the supporting portion 2b which is hung from one side of the lower end of the cylindrical portion 2a of the movable shaft 2 has a semicircular cross-section. At the center of the inner surface thereof, an arcuate concave surface 2g slidably contacting the outer peripheral surface 1f of the cylindrical portion 1c of the housing 1.
Are installed vertically.

The curvature of the arcuate 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. Two bearing recesses 2 are provided on the surface 2c.
d and 2c are vertically arranged in parallel in the circumferential direction at a predetermined interval, and by fitting the shaft portions 3a and 4a into the bearing recesses 2d and 2c, the pair of movable valves 3 and 4 are outwardly directed. Symmetrically,
The valve portions 3b and 4b are rotatably supported by the support portion 2b so as to be slidably in contact with the inner wall surface 1e of the housing 1.

Further, the rib 5 for opening the movable valves 3 and 4 is provided on the inner wall surface 1e of the housing 1, is long in the circumferential direction, and has a length in the vertical direction. Four
It is formed so as to be shorter than that of the movable valves 3 and 4, so that when the movable valves 3 and 4 ride on the ribs 5, they are formed between the movable valves 3 and 4 and the inner wall surface 1e of the housing 1. A passage (not shown) for the hydraulic oil C is formed. The structure is the same as that of the above-described first embodiment except for the points described above.

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

The fixed link 12 is fixed to the side plate 18a of the door mounting body 18 such as a cabinet by means of screws 19 ..., On the inner surface of the upper part thereof, while the movable link 13 is fixed to the inner surface of the upper part of the door 20 by the screw 21. By fixing with ...
The door 20 is pivotally installed so as to open and close the opening 18b of the door mounting body 18 by rotating.

In the illustrated example, at the upper end of the movable link 13, one end of the lower end of a link 23, whose upper end is rotatably attached to the door 20 side by a pin 22, is fixed to the fixed link 12. A tension spring 24 is stretched between the lower portions, and the door force is applied to the door 20 by the spring force.

In this manner, when the door 20 attached to the door mounting body 18 is pivoted upward from the closed position shown by the solid line in the drawing to the front, the short link 15 is closed. Although the movable shaft 2 is rotated counterclockwise by the link 15 from the position (a) in the counterclockwise direction indicated by the arrow F, the housing 1 fixed to the fixed link 12 is rotated by the link 15. At this time, the state becomes 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 is stored in the chamber B. It quickly flows into the interior, so that the damper force does not act and therefore the door 20 is opened lightly.

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

When the short link 15 is rotated up to the illustrated switching point (C) by opening the door 20, as shown in FIG.
As shown in FIG. 2, one movable valve 3 moves from above the rib 5 to the outer peripheral surface 1f of the cylindrical portion 1c 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 hydraulic fluid C does not flow, the external hydraulic oil C flows into the partition wall 1 of the housing 1.
Although it flows from the chamber A into the chamber B through the small hole 1h formed in d, the flow rate of the hydraulic oil C flowing through the small hole 1h is small, so that the damper force acts and the door 20 slowly opens. Then, the short link 15 is rotated to the door opening position (d) shown in the figure, 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 held in the valve open state.

When a force in the closing direction is applied to the door 20 in the open position against the door opening force, the movable shaft 2 causes the movable valves 3 and 4 to move.
However, since the other movable valve 4 is in the valve opening operation state, the passage 6 is passed between the movable valve 4 and the outer peripheral surface 1f of the cylindrical portion 1c. The hydraulic oil C flows from the chamber B into the chamber A, so that the damper force does not act, and thus 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, it is in the valve opening state as shown in FIG. 1 (C). The other movable valve 4 is transferred from above the rib 5 onto the outer peripheral surface 1f of the cylindrical portion 1c, as shown in FIG.
Receives a pressure from the hydraulic oil C in the chamber B to be in a valve closing operation state, and a passage 6 is provided between the movable valve 4 and the outer peripheral surface 1f of the cylindrical portion 1c.
Oil is not formed, the hydraulic oil C is applied to the small holes 1 of the partition wall 1d.
Although it flows from the chamber B to the chamber A through h, since the flow rate of the hydraulic oil C flowing through the small hole 1h is small, the damper force acts, and the door 20 slowly moves against the closing force of the tension spring 24. The short link 15 rotates to the door closing position (a) shown in the figure, 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 an operation change such as switching. In FIG. 7, a shows ON / OFF and switching operation of the damper force in the use example shown in FIG. A curve of change is shown, and operations such as change and switching of the damper force can be performed in addition to the curve a by changing the length, width and shape of the rib 5 and the shapes of the movable valves 3 and 4 described above. It is possible to perform complicated operations as shown by the middle thin solid line b, the broken line c, and the chain double-dashed line d.

[0044]

Since the present invention is configured as described above, by using this as a lift hinge or the like, the damper O in the closing direction near the door is closed.
N, damper OFF in the opening direction, damper ON in the opening direction near the opening of the door, damper OFF in the closing direction, damper OFF in the middle of the door opening and closing, damper OFF and other changes in damper force and operation changes such as switching Since the door can be opened and closed with a tension spring, etc., it can be opened and closed easily during the opening and closing of the door, and the door can be opened and closed during opening and closing. Since the opening and closing can be performed slowly, the risk at the time of opening and closing can be eliminated, and the rib length,
Complex movements can be obtained by changing the width, shape, shape of the movable valve, etc. Furthermore, the complicated movement changes described above can be performed easily, easily and at low cost by a single axis of the movable shaft fitted in the housing. can do.

[Brief description of drawings]

1A and 1B show a first embodiment of a rotary damper such as a lift hinge according to the present invention, in which (A) is a closed state, (B) is a closed state, (C) is a closed state, and (D) is a closed state. ) Is each cross-sectional view of the opened state.

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

FIG. 3 is a sectional view taken along line BB ′ in FIG.

FIG. 4 is a transverse sectional view showing a second embodiment of the rotary damper of the above.

FIG. 5 is a transverse sectional view showing a third embodiment of the rotary damper of the above.

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

FIG. 7 is a graph showing changes in the rotary damper force, changes in operation such as switching, etc. in the rotary damper.

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

[Explanation 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

Claims (1)

[Claims] 1. A housing and a movable shaft which are rotatably fitted to each other by an external force, and one member of which is
A pair of two movable valves, which slide on the outer peripheral surface of the other member by rotation, are symmetrically fitted and arranged at regular intervals in the circumferential direction so that the movable valves can rotate freely. Direction is divided into two chambers, each of which is defined in the circumferential direction, is filled with hydraulic oil, and when the pair of movable valves are rotated together with one member, the rotation direction of the other member causes the other member A passage for operating oil for the two chambers is formed between the movable valve and the outer peripheral surface which are operated in a valve opening operation state separated from the outer peripheral surface and are in the valve opening operation state. Ribs are provided so as to project in the circumferential direction of the outer peripheral surface with a length substantially equal to the distance between the pair of movable valves, and the pair of movable valves contact the outer peripheral surface of the other member. Of the external force And rolling toward the direction, the rotary damper of such a lift hinge being characterized in that as the pressure of the hydraulic oil is added.