JP2010196260A - Damping device and folding door device equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a folding door device which includes a center hinge and a damping device, and which brakes rapid mutual turning of door panels in the closing of a folding door, without excessively braking the motion of the folding door immediately before the closing of the folding door. <P>SOLUTION: A braking force F2 generated by the damping device is generated when the angle between the door panels reaches 130° or more, and hyperbolically and rapidly damped from a time immediately after that. After the braking force becomes constant through a damping process (D1), a closing force F1 generated by a center hinge is more rapidly decreased at a predetermined timing (T) before becoming weaker than the braking force F20 becoming constant, that is, from a time when the angle between the door panels reaches 150° in this case. Since the closing force F1 generated by the center hinge does not become weaker than the braking force F2 generated by the damping device, near the closing position of the folding door, the folding door can be surely closed to the end, while suppressing the mutual rapid turning of the door panels immediately before the closing of the folding door. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a shock absorber attached to a folding door and a folding door provided with the same to brake sudden rotation between doors when the folding door is formed by connecting left and right doors so as to be horizontally rotatable.

The folding door includes at least two doors, and connects the doors adjacent to each other via a center hinge (hinge) so as to be rotatable in the horizontal direction, and the upper end of the door is laid above the door. By supporting the rail movably through a runner, the doors are structured to open and close while rotating. And in folding doors that are opened and closed by hand, the left and right doors are forcibly forced by the force of the spring built into the center hinge, even if you release your hand when it closes, that is, when it is completely closed. Generally, it is configured to close to a closed position where a linear posture is achieved. (Patent Documents 1 to 4)
However, since the force of the spring incorporated in the center hinge acts abruptly when the folding door is closed, there is a problem that vibration and impact sound are generated by the impact when the folding door is closed.

  In order to solve this problem, it is effective to brake the sudden rotation between the door plates when closing the folding door with a shock absorber. As this type of shock absorber, a device that generates a constant braking force when a folding door is closed by a damper using fluid resistance is known. (Patent Documents 5 and 6)

Japanese Patent Publication No. 55-47191 Japanese Utility Model Publication No. 63-134088 No. 03-30541 Japanese Patent Laid-Open No. 03-228989 JP 2008-156906 A JP 2008-248596 A

  The spring built in the center hinge is compressed as much as possible during the closing of the folding door and then stretches, and the repulsive force during the extension acts as a closing force, so as the folding door approaches the fully closed state The force to approach the maximum extension state and close the folding door is weakened.

  For this reason, when this type of center hinge and a conventional shock absorber are used in combination, the closing force by the spring incorporated in the center hinge may be weaker than the braking force by the shock absorber in the vicinity of the closed position of the folding door. is there. In such a case, the movement at the time of closing of a folding door becomes too slow, and the malfunction that a folding door stops without stopping in the middle of closing movement will arise.

  A problem to be solved by the present invention is a shock absorber capable of braking a sudden rotation between door plates when closing a folding door without excessively braking movement when the folding door is closed, and a folding door provided with the same. To provide an apparatus.

  In order to solve the above-described problems, the shock absorber according to the present invention is attached to a folding door so as to brake the sudden rotation of the doors when the folding door is formed by horizontally connecting the left and right doors to each other. A first mounting member that is attached to a connecting end portion of one of the left and right doors with the other door, and one of the other doors of the left and right doors. A second attachment member attached to the connecting end of the door body, a hinge part rotatably connecting the attachment members to each other, and one attachment member to brake the mutual rotation of the attachment members. And a braking mechanism provided with a damper that generates a braking force by being compressed and repelled in the horizontal direction when the folding door is closed, and a contact mounted integrally or separately on the damper. And the one mounting member is A damper holding portion that holds the damper while guiding the contact member to be movable back and forth, and the contact member moves forward and backward as the damper expands and contracts, and a tip portion of the contact member contacts the other mounting member; The damper is a member that comes into contact, and the damper is compressed by the pressing of the other mounting member as the abutting member is rotated with the other mounting member when the folding door is closed, thereby generating a braking force. After the power becomes constant through a damping process immediately after generation, the power is further reduced at a predetermined timing before the folding door is completely closed.

  In the shock absorber according to the present invention, the predetermined timing is a timing before a closing force by a closing mechanism provided in the folding door to forcibly close the folding door becomes weaker than the constant braking force. It is desirable that The damper includes a cylinder, a piston in which the head portion is slidably accommodated in the cylinder, and a rod portion that protrudes outside through one end wall of the cylinder, the cylinder, A fluid that generates a resistance force relative to the piston, and a spring that constantly urges the piston so that the rod portion is maintained in a posture protruding from the one end wall of the cylinder. However, it is desirable that the resistance force due to the fluid generated when this is compressed is reduced at the timing. Further, the head portion at the time of extending the inner diameter of the cylinder of a predetermined length from the moving terminal position of the head portion at the time of compression so that the resistance force due to the fluid generated when compressing the damper is reduced at the timing. It is desirable to make it larger than the inner diameter of the cylinder on the side of the movement end position.

  In order to solve the above-described problems, a folding door device according to the present invention includes a center hinge that connects left and right door bodies so as to be horizontally rotatable, and a shock absorber that brakes sudden rotation when the door bodies are closed. The center hinge has a closing mechanism that generates a closing force that decreases with the mutual rotation of the doors when closing, in order to forcibly close the folding door, The shock absorber is a first attachment member that is attached to a connecting end of the one door body with the other door body among the left and right door bodies, and one door body of the other door body among the left and right door bodies. A second attachment member attached to the connection end of the two attachment members, a hinge part that rotatably connects the attachment members to each other, and one attachment member provided to brake the mutual rotation of the attachment members. A brake mechanism, wherein the brake mechanism closes the folding door. A damper that generates a braking force by being compressed in the horizontal direction and repelling, and an abutting member that is mounted integrally or separately on the damper, wherein the one mounting member advances and retracts the abutting member. A damper holding portion that holds the damper while being movably guided is provided, and the abutting member is a member that moves forward and backward as the damper expands and contracts and whose tip end abuts against the other mounting member. The damper is compressed when the contact member is pressed against the other mounting member in accordance with the mutual rotation of the two mounting members when the folding door is closed to generate a braking force, and the braking force is generated. After becoming constant through the damping process immediately after, the closing force by the closing mechanism is further reduced at a predetermined timing before becoming weaker than the constant braking force.

  In the folding door device of the present invention, the damper includes a cylinder, and a piston in which the head portion is slidably accommodated in the cylinder and the rod portion penetrates one end wall of the cylinder and protrudes to the outside. The piston is constantly biased so that the fluid that generates a resistance force in the relative movement between the cylinder and the piston and the rod portion are maintained in a posture protruding from the one end wall of the cylinder. It is desirable that a resistance force by the fluid generated when the spring is compressed is reduced at the timing. Further, the head portion at the time of extending the inner diameter of the cylinder of a predetermined length from the moving terminal position of the head portion at the time of compression so that the resistance force due to the fluid generated when compressing the damper is reduced at the timing. It is desirable to make it larger than the inner diameter of the cylinder on the side of the movement end position.

The shock absorber according to the present invention is configured such that the braking force decreases at a predetermined timing when the folding door is closed, so that the mutual movement of the door plates when the folding door is closed is not excessively slowed. It is possible to brake the sudden rotation of the door plates when they are closed.
Since the folding door device of the present invention includes the center hinge having the closing mechanism and the shock absorber of the present invention, the sudden rotation of the door plates at the time of closing is suppressed without excessively slowing the movement at the time of closing. And it can be securely closed to the end.

The rear view of the folding door apparatus provided with the buffer device of the present invention 1 is an overall perspective view of the shock absorber in FIG. 1 (a state in which both mounting members are completely opened). 1 is an overall perspective view of the shock absorber in FIG. 1 (critical state where braking force begins to work). 1 is an overall perspective view of the shock absorber in FIG. 1 (a state in which both mounting members are rotated at right angles to each other). (A)-(e) is the front view, left view, right view, top view, bottom view of the shock absorber of the present invention, respectively. Rear view of the shock absorber of the present invention Schematic sectional view showing a section cut along line AA in FIG. Exploded perspective view of the shock absorber of the present invention Exploded plan view of the shock absorber of the present invention The perspective view which showed the shock absorber of this invention, and the attachment hole formed in the doorplate to attach this (A), (b), (c) is sectional drawing of the buffer device of this invention when the angle between doorboards is 130 degrees, 150 degrees, and 175 degrees, respectively. A diagram showing how the closing force by the center hinge and the braking force by the damper change as the angle between the door plates changes. The fragmentary perspective view which shows a series of states at the time of opening and closing of the folding door apparatus shown in FIG. Partial top view which shows a series of states at the time of opening and closing of the folding door apparatus shown in FIG.

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

  FIG. 1 is a rear view of a folding door apparatus according to the present invention. 2, 3 and 4 are overall perspective views of the shock absorber according to the present invention. 5A to 5E are a front view, a left side view, a right side view, a plan view, and a bottom view of the shock absorber according to the present invention, respectively. FIG. 6 is a rear view of the shock absorber according to the present invention, and FIG. 7 is a schematic cross-sectional view showing a cross section cut along the line AA in FIG. 8 is an exploded perspective view of the shock absorber of the present invention, and FIG. 9 is an exploded plan view of the shock absorber of the present invention. FIG. 10 is a perspective view showing the shock absorber according to the present invention and mounting holes formed in the door plate for mounting the shock absorber.

  The folding door device 1 includes a folding door 10 in which a pair of left and right door plates (door bodies) 11 and 12 are connected to each other in a horizontal direction by center hinges 21 and 22, and a rail 30 laid above the folding door 10. The runners 41 and 42 that support the folding door 10 so as to be movable along the rail 30 in a state where the folding door 10 is suspended from the rail 30, the rectangular door frame 50 to which the rail 30 is attached, and the folding door 10 are closed. A shock absorber 60 equipped to brake the sudden rotation of the door plates 11 and 12 is provided. The center hinges 21 and 22 are well-known rotational coupling devices that are widely used as hinges for folding doors. The center hinges 21 and 22 have a so-called catch mechanism using a spring. When the angle between the door plates 11 and 12 is about 115 ° or more when the folding door 10 is closed, the catch mechanism is activated, The folding door 10 is forcibly guided to a fully closed state. In the example of FIG. 1, the shock absorber 60 is provided at a substantially central position between the two center hinges 21 and 22.

  The shock absorber 60 includes a first attachment member 61 that is attached to a connecting end portion of one door plate 11 and the other door plate 12 of the pair of door plates 11 and 12, and a connecting end of the other door plate 12 to the one door plate 11. A second attachment member 62 attached to the attachment portion, a hinge portion 63 that rotatably couples the attachment members 61, 62, and the second attachment member 62 to brake the mutual rotation of the attachment members 61, 62. Braking mechanism 70 provided.

  The first mounting member 61 and the second mounting member 62 are each provided with mounting brackets (common members) 80 having the same shape, the same size, and the same metal material. The mounting bracket 80 is a processed metal plate that is fastened to the door plates 11 and 12 with screws (not shown). The mounting bracket 80 includes a bracket body 81a having a U-shaped cross-section opened in front of the mounting holes 11a and 12a formed in the door plates 11 and 12, and an ear shape in the vertical direction from the open end edge of the bracket body 81a. And a pair of upper and lower bearing portions 81e and 81f. A screw hole 81d is formed in each of the flange portions 81b and 81c.

  The first mounting member 61 includes a first base member 91 made of resin that is fitted into the mounting bracket 80 and fixed integrally therewith. The first base member 91 is a substantially circular member that is fitted into the mounting hole 11 a of the door plate 11. The first base member 91 is engaged with the notch 91a formed so as to be fitted to the mounting bracket 80 and the edge of the bracket body 81a when completely fitted to the mounting bracket 80. A locking claw portion 91b is formed to prevent detachment from the device.

  The second mounting member 62 includes a resin-made second base member 92 that is fitted and fixed integrally to the mounting bracket 80. The second base member 92 is a substantially circular member that is fitted into the mounting hole 12 a of the door plate 12. The second base member 92 has a notch 92a formed so as to be fitted to the mounting bracket 80, and engages with the end edge of the bracket body 81a when completely fitted to the mounting bracket 80. A locking claw portion 92b is formed to prevent separation from the hook.

  The first mounting member 61 is fixed to the door plate 11 by tightening a screw through each screw hole 81d of the mounting bracket 80 with the first base member 91 fitted in the mounting hole 11a of the door plate 11. The second mounting member 62 is fixed to the door plate 12 by tightening a screw through each screw hole 81d of the mounting bracket 80 with the second base member 92 fitted in the mounting hole 12a of the door plate 12.

  The hinge portion 63 includes a pair of upper and lower bearing portions 81e and 81f formed on the mounting bracket 80 on the first mounting member 61 side, and a pair of upper and lower bearing portions 81e formed on the mounting bracket 80 on the second mounting member 62 side. 81f and the bearing parts 81e and 81f on the upper side of both mounting brackets 80 and the bearing parts 81f and 81e on the lower side are hinge shafts 63a and 63b, respectively, in a state where the shaft holes are alternately overlapped with each other. By connecting, both attachment members 61 and 62 are connected to each other so as to be rotatable.

  In this example, the first base member 91 and the second base member 92 are also provided with a pair of upper and lower bearing portions 91c and 91d and 92c and 92d, respectively. And these bearing parts 91c, 91d and 92c, 92d are also connected with hinge shafts 63a, 63b together with the bearing parts 81e, 81f of the mounting bracket 80. In this example, the distance between the two bearing portions 91 c and 91 d of the first base member 91 is selected so as to overlap the outside of the bearing portions 81 e and 81 f of the mounting bracket 80. Further, the distance between the two bearing portions 92c and 92d of the second base member 92 is selected so as to overlap the inside of the bearing portions 81e and 81f of the mounting bracket 80.

The braking mechanism 70 includes a damper 71 that is compressed in the horizontal direction and repels, and a contact member 73 that is attached to the damper 71.
The abutting member 73 may be formed integrally with the damper 71 as shown in FIG. 7B, or may be provided as a separate body as shown in FIG. 7A. In the following description, a configuration in which the contact member 73 is provided as a separate body (configuration shown in FIG. 7A) will be described.

  The damper 71 includes a cylindrical damper body (cylinder) 71A, and a head portion 71Ba slidably accommodated in the cylinder 71A. The rod portion 71Bb penetrates one end wall cylinder 71Ac of the cylinder 71A to the outside. And a projecting piston 71B. In the cylinder 71A, a coil spring 71C that generates a repulsive force against a force acting in a direction in which the damper 71 is compressed, that is, a direction in which the rod portion 71Bb of the piston 71B is pushed into the damper main body 71A, and a cylinder Oil (buffer body) that generates a resistance force to the relative movement between 71A and piston 71B is accommodated.

  The damper 71 is configured so that the resistance force caused by the oil generated when the damper 71 is compressed suddenly decreases at a predetermined timing after the closing force by the center hinges 21 and 22 starts working and before the folding door 10 is completely closed. The cylinder 71A of the portion (L2) on the side of the movement end position (P2) of the head portion 71Ba when the inner diameter dimension of the cylinder 71A of the predetermined length portion (L1) extends from the movement end position (P1) of the head portion 71Ba during compression. It is selected to be larger than the inner diameter dimension. This prevents the closing force by the center hinges 21 and 22 from becoming weaker than the braking force of the damper 71 before the folding door 10 is completely closed.

  The second base member 92 is formed with an accommodating portion (damper holding portion) 72 that accommodates the braking mechanism 70. The accommodating part 72 has an accommodating space surrounded by a cylindrical side wall extending in the horizontal direction. The side wall of the housing portion 72 on the side overlapping the first mounting member 61 bulges out from the base of the second base member 92 in a dome shape. Both end portions 72 a and 72 b of the accommodating portion 72 are open, and the braking mechanism 70 is inserted into the accommodating space from the opening end portion 72 a on the end side facing the first attachment member 61.

  The other open end 72b of the accommodating portion 72 is closed by a damper holding position adjusting cap 72e. The portion of the accommodating portion 72 where the cap 72e is attached is thicker than the other portions, and a female screw portion 72d is formed on the inner wall of the portion. On the other hand, a male screw portion 72f is formed on the outer peripheral portion of the body portion of the cap 72e. By screwing the male screw portion 72f with the female screw portion 72d of the storage portion 72, the cap 72e is fitted to the opening end portion 72b of the storage portion 72. Is installed. A disc-shaped end plate portion 72g for closing the cap 72e is formed on the outer end of the cap 72e. The outer peripheral edge portion of the end plate portion 72g slightly protrudes outward from the body portion of the cap 72e, and a knob portion 72h is formed by providing unevenness for preventing slippage in that portion. The holding position in the horizontal direction of the brake mechanism 70 can be finely adjusted by adjusting the amount of screwing of the cap 72e with respect to the accommodating portion 72 by adjusting the knob 72h with a finger and rotating the cap 72e. In other words, the damper holding position adjusting mechanism is configured by the female threaded portion 72d formed on the inner wall of the accommodating portion 72 and the cap 72e screwed to the female threaded portion 72, and by increasing the screwing amount of the cap 72e, The holding position of the braking mechanism 70 can be displaced further away from the first mounting member 61 if the screwing amount of the cap 72e is reduced. It can be made to.

  The first attachment member 61 is formed with a recess 91e that receives the housing portion 72 and the contact member 73 when the attachment members 61 and 62 are both turned to the side where the folding door 10 is opened and folded.

  The contact member 73 is a cap-shaped member that is attached to the damper main body 71A so as to cover the piston 71B from the side opposite to the rod portion 71Bb and whose tip is closed. The damper main body 71 </ b> A is completely accommodated in the contact member 73. The abutting member 73 is inserted into the accommodating portion 72 so as to be slidable in the horizontal direction, and moves together with the damper main body 71A while being accommodated. The base end portion of the contact member 73, that is, the end portion on the side where the rod portion 71Bb of the piston 71B is provided is slidably inserted into the cap 72e constituting the damper holding position adjusting mechanism. The protruding end of the rod portion 71Bb of the piston 71B is in contact with the inner surface of the end plate portion 72g of the cap 72e.

  The shape and size of the tip 73a of the contact member 73 are selected so that the contact member 73 contacts the side edge 91f of the first base member 91 on the second mounting member 62 side at a predetermined timing when the folding door 10 is closed. Has been. The contact member 73 is pressed by the first base member 91 along with the mutual rotation of the mounting members 61 and 62 when the folding door 10 is closed, and moves to the cap 72e side together with the damper main body 71A. The damper 71 is compressed between the member 73 and the cap 72e. When the folding door 10 is completely closed, the damper 71 is in the most compressed state.

  A pair of guide protrusions 73c and 73d are formed in the vicinity of the rear end of the contact member 73 so as to protrude vertically. On the other hand, the second base member 92 is formed with guide grooves (not shown) that receive the guide protrusions 73c and 73d and guide the guide protrusions 73c and 73d so as to be slidable in the horizontal direction. The guide protrusions 73c and 73d are guided in a guide groove (not shown), thereby preventing the contact member 73 from rotating and rattling with respect to the second base member 92.

  A small protrusion 73e is formed on the front surface of the contact member 73. On the other hand, an elongated hole 73 i extending in the horizontal direction (sliding direction of the contact member 73) is formed in the accommodating portion 72 so as to penetrate the wall of the accommodating portion 72. The small protrusion 73e of the contact member 73 is located in the long hole 73i of the accommodating portion 72, and is visible from the outside of the accommodating portion 72 through the long hole 73i. That is, the holding position of the braking mechanism 70 can be almost confirmed by the position of the protrusion 73e. Further, the protrusion 73e is in contact with the end of the long hole 73i, thereby preventing the contact member 73 from coming off.

11A, 11B, and 11C are cross-sectional views of the shock absorber 60 when the angles of the door plates 11 and 12 are 130 °, 150 °, and 175 °, respectively. 11A, 11B, and 11C, the damper 71 is shown integrally with the contact member 73 (configuration of FIG. 7B).
FIG. 12 is a diagram showing the manner in which the closing force by the center hinges 21 and 22 and the braking force by the damper 71 change with the change in the angle between the door plates 11 and 12, respectively. The horizontal axis of FIG. 12 indicates the rear side of the door plates 11 and 12 when the angle between the door plates 11 and 12 in the fully closed state of the folding door 10 (see FIGS. 13 (e) and 14 (e)) is 180 °. The angle indicates the strength of the closing force F1 and the braking force F2 on the vertical axis.

  As shown in FIG. 12, the closing force F1 by the center hinges 21 and 22 is generated when the angle between the door plates 11 and 12 is 115 ° or more, and is attenuated substantially linearly with the peak at the angle of 115 °. . On the other hand, the braking force F2 by the damper 71 is generated when the angle between the door plates 11 and 12 is 130 ° or more, and initially exceeds the closing force F1 instantaneously, but rapidly attenuates hyperbola immediately after that. Then, after becoming constant through the damping process (D1), at a predetermined timing (T) before the closing force F1 by the center hinges 21 and 22 becomes weaker than the constant braking force F20, that is, in this example Then, it decreases more rapidly from the time when the angle between the door plates 11 and 12 becomes 150 °. Therefore, in the vicinity of the closing position of the folding door 10, the closing force F <b> 1 by the center hinges 21 and 22 does not become weaker than the braking force F <b> 2 by the damper 71.

  FIG. 13 is a partial perspective view showing a series of states when the folding door device 1 is opened and closed, and FIG. 14 is a partial plan view. 13 and 14, (a) is a state in which the folding door 10 is fully open. When the folding door 10 is closed from this state, the state of (d), that is, the folding door 10, is passed through the states of (b) and (c). When the bending angle reaches approximately 115 °, the catch mechanisms of the center hinges 21 and 22 are operated, and the folding door 10 is forcibly guided to the state (e), that is, the fully closed state by its action. At that time, the braking force by the braking mechanism 70 starts to be effective at a predetermined timing after the operation of the catch mechanisms of the center hinges 21 and 22 until the folding door 10 is fully closed. As a result, the folding door 10 is gently guided to the fully closed state while the rapid rotation of the door plates 11 and 12 at the time of closing is braked. Meanwhile, since the closing force F1 by the center hinges 21 and 22 does not become weaker than the braking force F2 by the damper 71, the door plates 11 and 12 at the closing time do not excessively slow down the movement at the closing time of the folding door 10. It is possible to reliably close to the end by suppressing mutual rapid rotation.

  In the above-described embodiment, the damper main body (cylinder) 71A and the contact member 73 are configured as separate members. However, the damper main body (cylinder) 71A has the function and structure as the contact member 73. Thus, both may be constituted by one member. That is, it is not always necessary that the contact member 73 is mounted on the damper main body (cylinder) 71 </ b> A, and the damper main body (cylinder) 71 </ b> A has a portion (contact portion) that functions as the contact member 73. It may be adopted.

  The numerical values such as the angles 115 °, 130 °, and 150 ° shown in the above embodiment are merely examples, and may be changed as appropriate in accordance with actual conditions.

  In the above example, the first base member 91 and the second base member 92 are resin members. However, both or one of the base members 91 and 92 may be a metal member. Moreover, it is also possible to use a common member made of another material, for example, a hard resin or ceramic, instead of the mounting bracket 80.

DESCRIPTION OF SYMBOLS 1 Folding door apparatus 10 Folding door 11 Door board 12 Door board 21, 22 Center hinge 60 Shock absorber 61 1st attachment member (other attachment member)
62 Second mounting member (one mounting member)
63 Hinge part 70 Braking mechanism 71 Damper 71A Damper body (cylinder)
71Ac End wall 71B Piston 71Ba Head part 71Bb Rod part 71C Coil spring 73 Contact member P1 Movement end position P2 Movement end position L1 part L2 part

Claims (7)

A shock absorber attached to the folding door to brake the sudden rotation of the doors when the folding door is formed by connecting the left and right doors so as to be horizontally rotatable.
A first attachment member attached to a connecting end of the one door body with the other door body of the left and right door bodies;
A second attachment member attached to a connecting end portion of the left and right doors with one of the other doors;
A hinge portion that rotatably couples both mounting members to each other;
A braking mechanism provided on one mounting member to brake the mutual rotation of both mounting members,
The braking mechanism is
A damper that generates a braking force by being compressed and repelled horizontally when the folding door is closed;
A contact member mounted integrally or separately on the damper,
The one mounting member includes a damper holding portion that holds the damper while guiding the abutting member to be movable back and forth,
The contact member is
The damper is a member that moves forward and backward by expanding and contracting, and a tip part of which abuts against the other mounting member,
The damper is
The abutting member is compressed by being pressed against the other mounting member as the mounting members rotate with each other when the folding door is closed, thereby generating a braking force, and a damping process immediately after the braking force is generated. A shock absorber that is configured to further decrease at a predetermined timing after it becomes constant after the folding door is completely closed. The predetermined timing is
The shock absorber according to claim 1, wherein a closing force by a closing mechanism provided in the folding door to forcibly close the folding door is a timing before becoming weaker than the constant repulsive force. The damper is
A cylinder,
A piston in which the head portion is slidably accommodated in the cylinder and the rod portion penetrates one end wall of the cylinder and protrudes to the outside;
A fluid that generates resistance to the relative movement between the cylinder and the piston;
A spring that constantly urges the piston so that the rod portion is maintained in a posture protruding from the one end wall of the cylinder;
The shock absorber according to claim 2, wherein a resistance force caused by the fluid generated when the fluid is compressed is reduced at the timing.   Movement of the head portion when extending the inner diameter of the cylinder of a predetermined length from the movement end position of the head portion during compression so that the resistance force due to the fluid generated when compressing the damper is reduced at the timing. The shock absorber according to claim 3, wherein the shock absorber is larger than the inner diameter of the cylinder at the end position side. In the folding door device provided with a center hinge that connects the left and right door bodies so as to be horizontally rotatable, and a shock absorber that brakes sudden rotation between the door bodies when closing,
The center hinge is
In order to forcibly close this folding door, it has a closing mechanism that generates a closing force that decreases with the mutual rotation of the doors when closing,
The shock absorber is
A first attachment member attached to a connecting end of the one door body with the other door body of the left and right door bodies;
A second attachment member attached to a connecting end portion of the left and right doors with one of the other doors;
A hinge portion that rotatably couples both mounting members to each other;
A braking mechanism provided on one mounting member to brake the mutual rotation of both mounting members,
The braking mechanism is
A damper that generates a braking force by being compressed and repelled horizontally when the folding door is closed;
A contact member mounted integrally or separately on the damper,
The one mounting member includes a damper holding portion that holds the damper while guiding the abutting member to be movable back and forth,
The contact member is
The damper is a member that moves forward and backward by expanding and contracting, and a tip part of which abuts against the other mounting member,
The damper is
The abutting member is compressed by being pressed against the other mounting member as the mounting members rotate together when the folding door is closed, thereby generating a braking force, and the damping process immediately after the braking force is generated The folding door device is configured to further decrease at a predetermined timing before the closing force by the closing mechanism becomes weaker than the constant braking force after becoming constant after passing through. The damper is
A cylinder,
A piston in which the head portion is slidably accommodated in the cylinder and the rod portion penetrates one end wall of the cylinder and protrudes to the outside;
A fluid that generates resistance to the relative movement between the cylinder and the piston;
A spring that constantly urges the piston so that the rod portion is maintained in a posture protruding from the one end wall of the cylinder;
The folding door device according to claim 5, wherein a resistance force by the fluid generated when it is compressed is reduced at the timing.   Movement of the head portion when extending the inner diameter of the cylinder of a predetermined length from the movement end position of the head portion during compression so that the resistance force due to the fluid generated when compressing the damper is reduced at the timing. The folding door device according to claim 6, wherein the folding door device is larger than the inner diameter of the cylinder at the end position side.

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