JPH10205567A - Rotary damper and closed damping device using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of parts for inexpensiveness. SOLUTION: In a casing which is formed with a circular body 2 and a cover to close the opening of the body 2 and provided with plural viscose fluid filling chambers A, B, a columnar rotor 3 is stored coaxially with the body 2. A shaft 6 rotated integrally with the rotor 3 is protruded from the casing. The first communication passage R1 to communicate the filling chambers A, B is formed on a fixed partition 10 which is protruded from the inner periphery of the body 2 inward to the radial direction with the end put in slide contact with the outer periphery of the rotor 3. A radial moving body 15 is fitted into a vertical groove 14a formed at the end of a rotary partition 14 protruded from the outer periphery of the rotor 3 outward to the radial direction. A holding means is provided to keep a given space between the bottom wall of the groove 14a and the moving body 15. A flow passage 14b to communicate a space encircled by the bottom wall of the groove 14a and the moving body 15 with the fluid filling chambers A, B is provided on one side wall as part of the groove 14a so that the moving body 15 can contact the inner periphery of the body 2 with the rotation of the rotor 3 to one direction and separate from the inner periphery of the body 2 which the rotation thereof to the other direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary damper in which a resistance generated when rotating a rotating shaft in one direction is different from a resistance generated when rotating a rotating shaft in another direction. Also,
The present invention relates to a closure damper that uses the rotary damper to prevent an opening closure such as a door from closing suddenly.

[0002] In this specification, the circular shape includes a fan shape.

[0003]

2. Description of the Related Art Conventionally, there are various types of rotary dampers. For example, Japanese Utility Model Laid-Open Publication No. Sho 52-65555 discloses the following rotary dampers.

The interior of the main body of the rotary damper is divided into upper and lower two chambers having a circular cross section, a power storage mechanism is provided in one chamber, and a braking mechanism is provided in the other chamber, and a drive shaft penetrates the center of the chamber. doing. An inner end of a spiral spring having one end fixed in one chamber is fixed to one end of the drive shaft, and a wing piston extending radially outward is fixed to the other end of the drive shaft. . Furthermore, in the other room,
A pressure medium such as oil clay having suitable lubricity and fluidity is enclosed.

In the above-mentioned rotary damper, when the door is opened, a force is accumulated in the spiral spring, and the opened door is closed by the accumulated force.
Since the pressure medium is caused to flow by the wing piston, resistance to rotation of the drive shaft of the damper is generated, so that the door does not close suddenly.

[0006]

The above-mentioned conventional damper has a problem that the number of components for constituting the energy storage mechanism and the braking mechanism is large, and the rotary damper is expensive.
Also, in the case of a closed shock absorber using this rotary damper,
Since the door is closed by the force accumulated in the spring,
There is also the problem that the door cannot be left open.

An object of the present invention is to provide an inexpensive rotary damper with a small number of parts. It is still another object of the present invention to provide a closing shock absorber that can hold the door in an open state and does not suddenly close when the door is closed.

[0008]

SUMMARY OF THE INVENTION A rotary damper according to the present invention comprises a casing having a circular body having a circular cross section having a closed lower end and an open upper end, and a lid closing the opening. A plurality of cylindrical rotating bodies housed coaxially, and a rotating shaft provided at the center of the rotating body, penetrating the casing, projecting from the casing, and rotating integrally with the rotating body, are formed in the casing. A rotary damper in which a resistance force is changed by changing a cross-sectional area of a flow path in which a viscous fluid flows back and forth in a viscous fluid filling chamber. A fixed partition body protruding toward the outer surface of the rotating body is fixedly provided with a leading end sliding on the outer peripheral surface of the rotating body, and a rotating partition body protruding radially outward from the outer peripheral surface of the rotating body is formed on the rotating body. In The space surrounded by the inner surface of the body, the outer peripheral surface of the rotating body, the fixed partition, the rotary partition, and the lid is each formed as a viscous fluid filling chamber, and the continuous partition connects the filling chamber partitioned by the fixed partition to the fixed partition. A passage is formed,
A vertical groove extending from the upper end to the lower end of the front end surface is formed on the distal end surface of the rotary partition body, and a radial movable body is fitted into the vertical groove from one side edge, and at least one of the rotary partition body and the movable body is provided. On either side, holding means for maintaining a predetermined interval between the bottom surface of the vertical groove and one side edge of the movable body is provided, and a space surrounded by one side edge of the vertical groove and the radial movable body is a fluid inflow space. A flow path connecting the fluid filling chamber and the fluid inflow space is formed on one side wall forming the vertical groove of the rotary partition body, and the viscous fluid in the fluid filling chamber is caused by one rotation of the rotating body. It flows into the fluid inflow space through the flow path, pushes the radially movable body outward in the radial direction, and abuts the other side edge of the movable body on the peripheral surface of the body to form a filling chamber partitioned by the rotary partition body. The cross-sectional area of the communication passage that blocks each other or connects both With the rotation of the rotating body in the other direction, the viscous fluid in the fluid inflow space flows out to the filling chamber through the flow path, pulls the radial movable body inward in the radial direction, and moves the movable body and the like from the peripheral surface of the body. A new communication path is formed between the peripheral surface of the fuselage and the other side edge of the movable body between the filling chambers separated by the rotary partition body by separating the side edges, or a pre-formed communication path is formed between both the filling chambers. The cross-sectional area of the communication passage is increased.

Further, the closed shock absorbing device of the present invention comprises a shock absorbing device main body fixed to one of an opening closed body or an opening edge such as a door and an engaging member fixed to the other. The above-mentioned rotary damper, and a rotary arm fixed to a rotary shaft of the rotary damper, wherein the rotary arm is provided with a guide portion which is engaged with the engaging member and is guided by the engaging member. In the main body, the opening closing body in which the guide portion of the rotating arm and the engaging member are separated and the rotating arm is held in a predetermined state in a fully opened state, and the guiding member of the rotating arm and the engaging member are engaged with each other. A biasing means for biasing the opening closing body from the half-open state in a direction to close the opening closing body is provided, the door is closed by the biasing means, and the rotating arm rotates to rotate the rotating shaft of the rotary damper, thereby opening the opening closing body. Closing speed reduced It is those that have been made to so that.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 are cross-sectional views of a rotary damper of the present invention, and FIG. 3 is an exploded perspective view of a closed shock absorber of the present invention using the rotary damper.

The rotary damper (1) of the present invention comprises a cylindrical body (2) having a closed lower end and an open upper end;
(2) A cylindrical rotating body housed coaxially with the body (2)
(3), a lid (5) having an upper end opening of the body (2) closed, and a rotating shaft (6) fixed to the rotating body (3) and having an upper end protruding from the lid (5), The interior of the casing consisting of the body (2) and the lid (5) is partitioned into four viscous fluid filling chambers (A) and (B), and each of the filling chambers (A) and (B) is filled with viscous fluid. Have been. Although not shown, the lid 5 and the body 2 are fixed to each other by four screws.

Hereinafter, members forming the four filling chambers (A) and (B) will be described in detail.

The height of the upper end of the torso (2) and the height of the upper end of the rotating body (3) housed in the torso (2) are arranged on the same horizontal plane, and as shown in FIG.
(2) projects inward from the inner peripheral surface of the fuselage (2) from the upper end to the lower end of the fuselage (2), and the tip is a rotating body.
(3) Two fixed partitioning bodies (10) slidingly contacting the outer peripheral surface and facing each other are provided. On the other hand, as shown in FIG. 5, the rotator (3) forms an angle of 180 degrees with each other in the circumferential direction from the upper end to the lower end of the outer periphery of the rotator (3).
(3) It is provided with two vertical thick plate-shaped rotating partitions (14) projecting radially outward from the outer peripheral surface.
0) (14), fuselage (2) inner surface, rotating body (3) outer surface and lid
(5) Each space surrounded by the lower surface is a viscous fluid filling chamber.
(A) and (B). Thus, in the present embodiment, four viscous fluid filling chambers (A) and (B) are formed.

The rotating shaft (6) is connected to the short columnar portion (6a) at the lower end, the first prismatic portion (6b) connected to the short columnar portion (6a), and the first prismatic portion (6b). Oval column (6c) and oval column (6c)
And a short columnar portion (6a) at the lower end is fitted in a circular hole formed in the center of the lower end surface of the body (2), The first prismatic part (6
b) is a rectangular through-hole (3a) formed in the center of the rotating body (3)
And the rotating shaft (6) and the rotating body (3) rotate integrally. Although illustration is omitted,
A washer and a retaining ring are fitted around the short columnar portion (6a).

The lid (5) has a disk-shaped portion (5a).
A circular through-hole is formed at the center of the disk-shaped portion (5a), and a cylindrical portion (5b) protruding upward is formed around the through-hole. Rotary shaft (6) in cylindrical part (5b)
And a second prismatic portion (6d) at the upper end of the rotating shaft (6) protrudes upward from the lid (5).
In addition, although illustration was omitted around the long columnar portion (6c),
An O-ring and a cylindrical bearing are provided. Also the lid
(5) On the upper surface, two large and small protrusions protruding upward (5c) (5d)
The large protrusion (5c) has a screw hole (5e) and a through screw hole (5f), and the small protrusion (5d) has one through screw hole (5g). Each is formed. In the screw hole (5e),
A hexagonal screw (7) is screwed in, and as will be described in detail later, when this rotary damper (1) is used as a closing shock absorber, the rotating arm of the closing shock absorber comes into contact with the screw (7). It has been made to stop. Although illustration is omitted,
The cover (5) is provided with through-holes in the vertical direction at appropriate locations. The screw hole is normally closed by screwing in the screw, and when necessary, the screw is removed to allow the viscous fluid to enter the rotary damper (1) from the screw hole.

A first communication path (R1) formed of a groove extending in the circumferential direction is formed on the upper surface of each fixed partition (10), and the fixed partition (10) is formed by the first communication path (R1). The viscous fluid filling chambers (A) and (B) separated by are connected to each other. At the center of each first communication passage (R1), a vertical bottomed hole (12) having a diameter larger than the width of the first communication passage (R1) is formed. The bottomed holes (12) are through screw holes (5f) in the lid (5), respectively.
(5g). Then, by changing the screwing amount of the screw (13) screwed into the through screw hole (5f) (5g), the screw protrudes from the lower surface of the disc-shaped portion (5a) and is inserted into the bottomed hole (12). By changing the length of the screw (13) protruding to the outside, the flow path cross-sectional area of the first communication passage (R1) can be adjusted to adjust the resistance generated when the rotating body (3) rotates. .

As shown in FIG. 5, a vertical groove (14a) extending from the upper end to the lower end is formed at the tip of each rotary partition (14). The vertical groove (14a) has a vertical movable plate
(15) is inserted. Notches (holding means) (1) in the upper and lower portions of the radially inner end of the movable body (15)
5a) is formed. Then, when the movable body (15) moves inward in the radial direction, the radially inner end surface of the movable body (15) comes into contact with the bottom wall surface of the vertical groove (14a) and the radially inward side of the notch (15a). A predetermined gap is provided between the side end face and the vertical groove (14a) bottom wall, and the lower notch (15a)
a) and the body (2) The space surrounded by the upper surface of the lower wall and the space surrounded by the upper notch (15a), the vertical groove (14a) and the lid (5) are the fluid inflow space (S), respectively. It has been done. When the rotating partition (14) rotates counterclockwise among the side walls of the rotating partition (14) forming the longitudinal groove (14a), fluid is formed on the upper and lower portions of the side wall located on the front side in the rotation direction. Notches (flow paths) (14b) connecting the inflow space (S) and the viscous fluid filling chamber (B) are formed respectively. In the following description, two viscous fluid filling chambers that are not connected to the fluid inflow space (S) will be referred to as a first filling chamber (A) and a fluid inflow space.
(S) two viscous fluid filling chambers connected to the second filling chamber
(B).

The rotary damper (1) configured as described above
For example, as shown in FIG. 1, when a clockwise force is applied to the rotating shaft (6) and the rotating body (3) rotates clockwise, the pressure in the second filling chamber (B) decreases. Then, the viscous fluid in the fluid inflow space (S) flows out to the second filling chamber (B) through the notch (14b) of the rotary partition (14), and the viscous fluid in the fluid inflow space (S) is removed. As the volume decreases, the movable body (15) is pulled inward in the radial direction to form a gap between the distal end surface of the movable body (15) and the inner peripheral surface of the body (2), and the second communication passage (R2) is formed. Formed and rotating partition
Second filling chamber (B) and first filling chamber (A) partitioned by (14)
Is connected. Thus, when the rotating body (3) rotates clockwise, the second filling chamber (B) and the first filling chamber (A) partitioned by the rotary partition (14) are connected to the second communication passage (R2). Second filling chamber connected by a fixed partition body (10)
(B) and the first filling chamber (A) are connected by the first communication path (R1), so that the resistance generated when the rotating body (3) rotates is reduced.

As shown in FIG. 2, when a counterclockwise force is applied to the rotating shaft (6) and the rotating body (3) rotates counterclockwise, the pressure in the fluid inflow space (S) decreases. Second filling room
The viscous fluid in (B) flows into the fluid inflow space (S) through the notch (14b) in the rotary partition (14), and the volume of the viscous fluid in the fluid inflow space (S) increases and the fluid moves. The second filling chamber (B) in which the body (15) is pushed outward in the radial direction and the tip surface of the movable body (15) comes into contact with the inner peripheral surface of the body (2) and is partitioned by the rotary partition (14).
And the first filling chamber (A) are shut off. Thus, the rotating body
When (3) rotates counterclockwise, the second filling chamber (B) and the first filling chamber (A) partitioned by the rotary partition (14) are shut off and separated by the fixed partition (10). Since the second filling chamber (B) and the first filling chamber (A) are only connected by the first communication passage (R1), the resistance generated when the rotating body (3) rotates is increased.

When no more force is applied to the rotating shaft (6), the rotating body (3) stops immediately due to the viscous force of the viscous fluid, and the rotating body (3) is kept stopped.

In the rotary damper (1) according to the above embodiment, the first communication path (R1) is formed by grooves formed in the fixed partition (10) and extending in the circumferential direction. A gap between the end surface of the partition (10) and the outer peripheral surface of the rotating body (3) may be used as the first communication path.

As shown in FIG. 6, a protrusion (holding means) (16a) protruding radially inward is provided at an upper portion and a lower portion of the radially inner end of the movable body (16). Formed upper protrusion (16a) Lower surface, vertical groove (17a) of rotary partition (17)
And the space surrounded by the upper surface of the lower protrusion (16a) is defined as a fluid inflow space (S), and the rotary partition (1) having a longitudinal groove (17a) formed therein.
A through hole (flow path) (17b) connecting the fluid inflow space (S) and the viscous fluid filling chamber (B) may be formed in the center of one side wall of 7).

Also in the rotary damper provided with the movable body (16) and the rotary partition (17), when the rotary body (3) rotates clockwise, the viscous fluid in the fluid inflow space (S) is rotated. Through the through hole (17b) of the partition (17), it flows into the second filling chamber (B), and a gap is formed between the tip end surface of the movable body (16) and the inner peripheral surface of the body (2). A communication path (R2) is formed.

When the rotator (3) rotates counterclockwise, the viscous fluid in the second filling chamber (B) flows through the through-hole of the rotary partition (17).
(17b), flows into the fluid inflow space (S),
The second filling chamber (B) and the first filling chamber (A), which are separated by the rotary partition (17), are cut off by contacting the front end surface and the inner peripheral surface of the body (2).

Further, a protrusion (holding means) projecting in the circumferential direction is formed at a radially outer end of the movable body so that a gap is formed between the radially inner end face of the movable body and the bottom wall surface of the vertical groove. The movable body radially inward end surface and the vertical groove bottom wall surface by a protrusion (holding means) projecting radially outward from the vertical groove bottom wall surface. It may be made to be possible.

In the case where the body is manufactured by die casting or the like and the body has a truncated cone shape, the height of the movable body is made lower than the height of the rotating body so that the movable body can be moved not only in the radial direction but also in the vertical direction. Can be moved, it is not necessary to incline the outer edge of the movable body in the radial direction in accordance with the inclination of the inner peripheral surface of the body. In this case, the viscous fluid filling chamber partitioned by the rotary partition body is not completely shut off even when the movable body comes into contact with the peripheral surface of the body, and is not closed by a slight gap (communication passage). Are connected,
The movement of the movable body changes the cross-sectional area of the gap, and changes the resistance when the rotating body rotates.

Next, a case where the above-mentioned closing shock absorber using the damper is applied to a door which rotates around a vertical axis to close and open an opening will be described with reference to FIGS. In the following description, the front, rear, left, and right are based on FIG. 8, and the front side of FIG.
It is assumed that the left side of the paper is the left and the right side of the paper is the right.

The closing shock absorber according to the present invention comprises a shock absorber main body (19) fixed to the front upper right portion of the door (opening closing body) (D) and an engaging member (20) fixed to the upper edge of the opening. Become.

The shock absorber main body (19) includes a plate-like vertical member (21) fixed to the front surface of the door (D), a plate-like horizontal member (22) protruding forward from the vertical member (21), At the left end of the horizontal member (22),
The rotary damper (1) fixed so that the rotating shaft (6) rotates around the vertical axis, and the second prismatic portion (6d) of the rotating shaft (6) of the rotary damper (1) having a plate-shaped base. A rotating arm (23) extending in the horizontal direction fixed to the base, an inner rod (31) whose base is rotatably supported on the left side of the rotating arm (23), and extends rightward; Is the shaft provided on the horizontal member (22)
(24) rotatably supported by the outer cylinder (32) and extending to the left, and the tip of the inner rod (31) is attached to the tip of the outer cylinder (32). Fitted, inner rod (31)
The outer cylinder (32) and the outer cylinder (32) move in the axial direction with each other, so that the length between the bases of the inner rod (31) and the outer cylinder (32) changes. Further, spring receivers (31a) and (32a) are provided at the center portions of the lengths of the inner rod body (31) and the outer cylinder body (32), respectively, between the spring receivers (31a) and (32a). A compression spring (33) is provided.

The rotary arm (23) is formed with a rotary guide notch (guide portion) (23a) extending leftward from the tip, and the tip of the rotary arm (23) is forked. A concave portion (23b) is formed at the left end of the rotating arm (23), and the head of the screw (7) is located in the concave portion (23b). A cylindrical elastic member (26) is attached to the front side of the rotating arm (23), and the door (D)
Reduces the impact of collision with the door opening edge.

The engaging member (20) includes a vertical plate-like portion (27) fixed to the opening edge, a horizontal plate-like portion (28) protruding forward from the lower end of the vertical plate-like portion (27), An engagement roller (30) is provided at the front end of the horizontal plate-shaped portion (28), protruding downward, and provided rotatably around a vertical axis.

Hereinafter, the operation of the above-mentioned closing shock absorber will be described with reference to FIGS. In the following description, clockwise and counterclockwise refer to FIG. 9 as a reference.

As shown in FIG. 9, when the door (D) is closed, the base of the inner rod body (31) is positioned between the center of the rotary shaft (6) of the rotary damper (1) and the outer side. The spring (33) is located at a position shifted toward the door (D) from the line connecting the rotation center of the cylinder (32) and the rotation axis (6) of the damper (1) counterclockwise. Urges the rotating arm (23). In this state, the bases of the inner rod body (31) and the outer cylinder body (32) are separated by a predetermined distance, and the rotating arm (23) is in contact with the projection of the vertical member (21). (23) is prevented from rotating counterclockwise, and the rotating arm (23) is stopped.
When the door (D) is opened from this state, as shown in FIG.
The rotating arm (23) is guided by the engaging roller (30), rotates clockwise, and the rotating shaft (6) of the rotary damper (1) rotates clockwise. At the same time, the distance between the base portions of the inner rod body (31) and the outer cylinder body (32) is shortened, and the spring (33) is contracted. In this state, the base of the inner rod (31) is a rotary damper.
The spring (33) is located at a position shifted toward the door (D) from the line connecting the center of the rotation shaft (6) of (1) and the center of rotation of the outer cylinder (32).
Urges the rotating arm (23) to rotate counterclockwise.

Further, when the door (D) is opened, as shown in FIG. 11, the engagement roller (30) separates from the rotation guide notch (23a), and the rotary damper (1) rotates a predetermined amount from the door closed state. Take the state. In this state, the base of the inner rod (31) is moved from the line connecting the center of the rotation axis (6) of the rotary damper (1) and the center of rotation of the outer cylinder (32) to the door (D). The spring (33) urges the rotary damper (1) to rotate clockwise, but the spring (33) is located at one side edge of the concave portion (23b) of the rotary arm (23). The screw (7) is in contact, the damper (1) does not rotate clockwise, and the state in which the rotating arm (23) has rotated a predetermined amount from the door closed state is maintained. This state does not change even if the door (D) is further opened, as shown in FIG. In addition,
As shown in FIG. 1, the rotating body (3) of the rotary damper (1)
However, since the resistance generated when rotating clockwise is small, almost no force is required to rotate the damper (1), and the force required to open the door (D) depends on the biasing force of the spring (33). This is almost the same as the force required to contract the spring (33).

Next, when the door (D) is closed from the state shown in FIG. 12, the engagement roller (30) is rotated at the position shown in FIG.
(23a). When the door (D) is further closed from this state, as shown in FIG. 10, the base of the inner rod body (31) is connected to the center of the rotary shaft (6) of the rotary damper (1) and the outer cylindrical body (31). Take the position shifted to the door (D) side from the line connecting the rotation center of (32) and the contracted spring (33) expands, and the spring (33) expands without applying human power to the door (D) As a result, the rotating arm (23) is rotated counterclockwise, and the door (D) is closed as shown in FIG. When the door (D) is closed by the extension of the spring (33), the rotating body (3) of the rotary damper (1) rotates counterclockwise, and as shown in FIG. 3) Since the resistance generated when rotating counterclockwise is large, the closing speed of the door (D) is reduced, and the door (D) does not close vigorously and no unpleasant noise is generated.

Since the rotary damper (1) does not rotate unless a force is applied from the outside, the engagement roller
When (30) is away from the guide notch (23a), the door
(D) can be stopped at any position.

The closing shock absorber of the present invention can be applied to a sliding door. Hereinafter, a case where the closure shock absorber of the present invention is applied to a sliding door will be described with reference to FIG.

The closed shock absorber of the present invention comprises a shock absorber body (39) fixed to the upper edge of one end of the opening of the sliding door (E) and an engaging member (40) fixed to the upper end of one end of the sliding door (E). ).

The shock absorber main body (39) has a horizontal plate-like portion (46) projecting from the upper edge of one end of the opening, a vertical plate-like portion (47) projecting downward from the horizontal plate-like portion, A rotary damper (1) fixed to a vertical plate-shaped portion (47) and rotating around a horizontal axis.A rotary arm (43) is attached to a rotary shaft (6) of the rotary damper (1). ing. In addition, the shock absorber body (3
9) is an inner rod body (41) whose base is rotatably supported by the base end of a rotating arm (43), and an outer cylinder (42) whose base is rotatably supported by a vertical plate-like part. The tip of the inner rod (41) is fitted into the tip of the outer cylinder (42), and the inner rod (41)
And the outer cylinder (42) moves in the axial direction with respect to each other, and the inner rod (41)
The distance between the base and the outer cylinder (42) is changed. Further, a spring receiver is provided at a central portion of the length of the inner rod body (41) and the outer cylinder body (42), and a compression spring (49) is arranged between the two spring receivers.

The engaging member (40) has a plate-like portion (44) projecting obliquely upward from the upper end of one end of the sliding door (E), and an engaging member attached to the tip of the plate-like portion and rotating about a horizontal axis. Roller (4
5).

When the door (E) is opened and closed, the rotary arm (43) rotates in the above-mentioned closing shock absorber, and when the door is closed,
The door (E) is closed by the spring (49) and the door closing speed is reduced by the rotary damper (1).

The closing shock absorber of this embodiment can be applied not only to doors but also to, for example, hoods of automobiles and lids of large hardware boxes.

[0044]

According to the rotary damper of the present invention, the rotation of the rotating body causes the radially movable body to move in the radial direction, so that the adjacent viscous fluid filling chambers are communicated or shut off. Since the resistance required for the rotation is changed, the number of components constituting the rotary damper can be reduced, and the rotary damper is inexpensive.

Further, since the rotary damper does not rotate unless a force is applied from the outside, according to the closed shock absorber using the rotary damper, the door is in the open state in which the engaging member and the guide are separated from each other. In, the door can be fixed at any position.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a rotary damper of the present invention.

FIG. 2 is a transverse sectional view showing another state of the damper.

FIG. 3 is an exploded perspective view of the closing shock absorber of the present invention using the damper.

FIG. 4 is a perspective view of a body of the damper.

FIG. 5 is a perspective view of a rotating body of the damper.

FIG. 6 is a perspective view of another rotating body used in the damper.

FIG. 7 is a perspective view of the closure shock absorber of the present invention.

FIG. 8 is a side view of the closing shock absorber.

FIG. 9 is a plan view of the closing shock absorber when the door is closed.

FIG. 10 is a plan view showing a state where a door is opened in the close buffer device.

FIG. 11 is a plan view showing a state in which the door is further opened from the state of FIG. 10 in the close buffer device.

FIG. 12 is a plan view showing a state in which the door is further opened from the state shown in FIG. 11 in the close buffer device.

FIG. 13 is a front view of another embodiment of the closure shock absorber according to the present invention.

[Explanation of symbols]

 (1) Rotary damper (2) Body (3) Rotating body (5) Lid (10) Fixed partition (14) (17) Rotating partition (14a) (17a) Vertical groove (14b) (17b) Flow Road (15) (16) Movable body (15a) Holding means (notch) (16a) Holding means (projection) (19) (39) Shock absorber body (20) (40) Engaging member (23) (43) Rotating arm (23a) Guide (A) (B) Viscous fluid filling chamber (D) (E) Door (closed opening) (R1) First communication path (R2) Second communication path (S) Fluid inflow space

Claims (2)

[Claims] A casing comprising a body having a circular cross-section having a closed lower end and an open upper end, and a lid closing the opening; a cylindrical rotating body accommodated in the casing coaxially with the body; A rotating shaft provided at the center of the rotating body, protruding from the casing, and rotating integrally with the rotating body, and having a plurality of viscous fluid filling chambers formed in the casing, a cross-sectional area of a flow path when the viscous fluid flows back and forth. A rotary partition, the resistance of which is changed by changing the outer diameter of the rotary body, wherein the fixed partition protrudes inward from the inner peripheral surface of the fuselage and has a leading end sliding on the outer peripheral surface of the rotary body. The body is provided in a fixed manner, and a rotating partition body that protrudes radially outward from the outer peripheral surface of the rotating body is formed on the rotating body,
Spaces surrounded by the outer peripheral surface of the rotating body, the fixed partition, the rotary partition, and the lid are each formed as a viscous fluid filling chamber, and the fixed partition has a communication passage connecting the filling chamber partitioned by the fixed partition. A vertical groove extending from the upper end to the lower end of the distal end surface is formed on the distal end face of the rotary partition body, and the radial movable body is fitted into the vertical groove from one side edge, and at least the rotary partition body or the movable body is Holding means for maintaining a predetermined distance between the bottom wall surface of the vertical groove and one side edge of the movable body is provided on one of them, and a space surrounded by one side edge of the vertical groove and the radial movable body is a fluid inflow space. A flow path connecting the fluid filling chamber and the fluid inflow space is formed on one of the side walls forming the vertical groove of the rotary partition body, and the viscous fluid in the fluid filling chamber is caused by the rotation of the rotating body in one direction. Flows into the fluid inflow space through the flow path and has a radius The movable body is pushed radially outward to bring the other side edge of the movable body into contact with the peripheral surface of the body, and the viscous fluid in the fluid inflow space passes through the flow path to the filling chamber as the rotating body rotates in the other direction. A rotary damper that flows out, pulls the movable body in the radial direction inward in the radial direction, and separates the other side edge of the movable body from the peripheral surface of the body. 2. The rotary damper according to claim 1, comprising a shock absorber main body fixed to one of an opening closure or an opening edge such as a door and an engaging member fixed to the other. And a rotating arm fixed to the rotating shaft of the rotary damper, wherein the rotating arm is provided with a guide portion which engages with the engaging member and is guided by the engaging member. In the fully-open state of the open-closed body in which the guide portion and the engaging member are separated from each other, the rotary arm is held in a predetermined state, and the open-closed body in which the guide portion of the rotary arm is engaged with the engaging member is closed from the half-open state. An urging means for urging in a direction to close the body is provided, the door is closed by the urging means, and the rotating arm rotates to rotate the rotary shaft of the rotary damper, thereby reducing the closing speed of the open closing body. Is made to Closure shock absorber.