JP2012021559A - Buffer device - Google Patents

Abstract

A shock absorber capable of reducing the mounting space is obtained.
When a load is applied to a front end portion of a piston cylinder and pressed, the piston cylinder moves relative to the case in the arrow B direction. At this time, the flange portion 34 of the piston rod 24 comes into contact with the rod stopper contact portion 14E of the case 14 and stops moving, and the piston cylinder 20 moves in the compression direction with respect to the piston rod 24. On the other hand, when a load is applied to the tip 36 </ b> C of the slider 36 and pressed, the piston rod 24 moves in the direction of arrow A with respect to the case 14. At this time, the stepped portion 30 of the piston cylinder 20 contacts the cylinder stopper contact portion 14D of the case 14 and stops moving, and the piston rod 24 moves in the compression direction with respect to the piston cylinder 20.
[Selection] Figure 1

Description

  The present invention relates to a shock absorber for softening an impact when opening and closing an opening / closing body such as a door.

  Conventionally, for example, a piston damper has been used as a shock absorber for reducing the impact when opening and closing an opening / closing body such as a door. In this case, two piston dampers are required: a piston damper for reducing the impact when opening the opening / closing body and a piston damper for reducing the impact when closing the opening / closing body. In Patent Document 1, the rod body includes a first rod and a second rod that are aligned in the axial direction, and an expansion / contraction mechanism that connects the first rod and the second rod to each other so as to be capable of axial expansion and contraction. The expansion / contraction mechanism portion is provided at the shaft end of one rod of the first rod and the second rod, and at the shaft end of the other rod and is within a predetermined axial range on the inner periphery of the cylinder. And a piston that is slidably fitted via a sliding body.

JP 2009-275746 A

  However, if two dampers are used as shock absorbers to reduce the impact when opening and closing the opening / closing body, the installation space increases. In addition, when using the apparatus of patent document 1, it is necessary to connect a 1st rod and a 2nd rod with the to-be-attached body and the opening-and-closing body attached to the to-be-attached body. For this reason, the opening amount of the opening / closing body is limited by the stroke of the rod and cannot be used.

  In view of the above facts, an object of the present invention is to obtain a shock absorber capable of reducing the mounting space.

  The shock absorber according to the first aspect of the present invention includes a piston cylinder provided with a cylinder stopper at an outer peripheral portion, a piston inserted movably in the piston cylinder, and a rod stopper connected to the piston at the outer peripheral portion. A shock absorber provided with a piston rod, and a spring provided in the piston cylinder for biasing the piston in a direction in which the piston rod protrudes from the piston cylinder, and the shock absorber can be moved in the load acting direction. A buffer means support member stored in the buffer means support member, provided at one end of the buffer means support member in the moving direction of the buffer means, abutting against the cylinder stopper, and a part of the piston cylinder being part of the buffer means support member Cylinders for stopping the movement of the piston cylinder while protruding from the cylinder A stopper abutting portion, and provided on the other end side in the movement direction of the buffer means in the buffer means support member, abut against the rod stopper, and part of the piston rod from the buffer means support member A rod stopper abutting portion for stopping the movement of the piston rod in a protruding state.

  In the shock absorber according to the first aspect of the present invention, the shock absorber is housed in the shock absorber support member so as to be movable in the direction of the load. For this reason, when a load is applied to the piston cylinder, a part of which protrudes from the buffer means support member, the buffer means moves in the load acting direction with respect to the buffer means support member. At this time, the rod stopper provided on the outer peripheral portion of the piston rod comes into contact with the rod stopper abutting portion provided on one end side of the buffering means supporting member in the moving direction of the buffering means, so that a part of the piston rod is buffered. The movement of the piston rod is stopped while protruding from the means supporting member. As a result, the piston cylinder moves in the compression direction against the urging force of the spring with respect to the piston rod connected to the piston movably inserted into the piston cylinder. For this reason, the impact which acts on the piston cylinder side can be relieved.

  On the other hand, when a load is applied to the piston rod, a part of which protrudes from the shock absorber support member, the shock absorber moves in the load acting direction with respect to the shock absorber support member. At this time, the cylinder stopper provided on the outer peripheral portion of the piston cylinder comes into contact with the cylinder stopper abutting portion provided on the other end side in the moving direction of the buffering means in the buffering means supporting member, and part of the piston cylinder is brought into contact. The movement of the piston cylinder is stopped while protruding from the buffer means support member. As a result, the piston rod connected to the piston movably inserted in the piston cylinder moves against the urging force of the spring in the compression direction with respect to the piston cylinder. For this reason, the impact which acts on the piston rod side can be relieved.

  Therefore, the shock generated on the piston rod side and the shock generated on the piston cylinder side can be reduced with a single buffering means. For this reason, the mounting space of the shock absorber can be reduced as compared with the case where two shock absorbers are used.

  According to a second aspect of the present invention, in the shock absorber according to the first aspect, the cylinder stopper is a step portion between a small diameter portion and a large diameter portion of the piston cylinder, and the small diameter of the piston cylinder from the buffer means supporting member. The part protrudes.

  In the shock absorber according to the second aspect of the present invention, the cylinder stopper is a step portion between the small diameter portion and the large diameter portion of the piston cylinder, and the small diameter portion of the piston cylinder protrudes from the bump buffer means supporting member. Yes. For this reason, a piston cylinder can be made to protrude from a collision buffer means support member by simple structure, and the productivity of a buffer device improves.

  According to a third aspect of the present invention, in the shock absorber according to the first or second aspect, the rod stopper is a flange portion, and a part of the piston rod protruding from the buffer means supporting member is the flange portion. It is a slider that is linked to.

In the shock absorber according to a third aspect of the present invention, the rod stopper is a flange portion, and a slider interlocking with the flange portion protrudes from the bump buffer means supporting member. For this reason, a part of piston rod can be reliably protruded from a collision buffer means support member by simple structure, and the productivity of a buffer device improves.

  Since the shock absorber according to the first aspect of the present invention has the above-described configuration, the installation space can be reduced.

  Since the shock absorber according to the second aspect of the present invention has the above-described configuration, productivity can be improved.

  Since the shock absorber according to the third aspect of the present invention is configured as described above, productivity can be improved.

It is the perspective view which made the section a part which shows the buffering device concerning one embodiment of the present invention. It is a perspective view which shows the buffering device which concerns on one Embodiment of this invention. It is side sectional drawing which shows the sliding door to which the buffering device which concerns on one Embodiment of this invention was applied. It is a sectional side view which shows the closed state of the sliding door to which the buffering device which concerns on one Embodiment of this invention was applied. It is side sectional drawing which shows the open state of the sliding door to which the buffering device which concerns on one Embodiment of this invention was applied. It is a disassembled perspective view which shows the door frame and the sliding door to which the buffering device which concerns on one Embodiment of this invention was applied.

  A shock absorber according to an embodiment of the present invention will be described with reference to FIGS. In the figure, the arrow FR indicates the forward direction of the shock absorber, and the arrow UP indicates the upward direction of the shock absorber.

(Buffer device)
As shown in FIGS. 1 and 2, the shock absorber 10 of the present embodiment includes a piston damper 12 as a shock absorber and a case 14 as a shock absorber support member that houses the piston damper 12. The case 14 accommodates the piston damper 12 so as to be movable in the axial direction of the piston damper 12 (arrow A direction and arrow B direction in FIG. 1), which is the direction of load application.

  As shown in FIG. 1, the case 14 includes a main body portion 14A in which a cylindrical space 15 is formed, and an attachment portion 14B formed in an upper portion of the main body portion 14A. As shown in FIG. 2, both end portions of the mounting portion 14B of the case 14 in the width direction (the direction of the arrow W1 in FIG. 2) are coupling portions 14C protruding outward from the main body portion 14A in the width direction. The case 14 is configured such that the coupling portion 14C of the mounting portion 14B is fixed to the support member by a fixing member (not shown) such as a screw or by adhesion.

  As shown in FIG. 1, one end portion of the main body portion 14A of the case 14 in the moving direction of the piston damper 12 is a cylinder stopper contact portion 14D, and a circular portion is formed at the center of the cylinder stopper contact portion 14D. A through hole 16 is formed. On the other hand, the other end portion of the main body portion 14A of the case 14 in the moving direction of the piston damper 12 is a rod stopper abutting portion 14E. A circular through hole 18 is formed at the center of the rod stopper abutting portion 14E. Is formed.

  The piston damper 12 includes a piston cylinder 20 having a cylindrical shape, a piston 22 inserted into the piston cylinder 20 so as to be movable in the axial direction of the piston cylinder 20, and one end connected to the piston 22 as a piston rod. 24 and a spring 26 provided inside the piston cylinder 20. Further, the spring 26 biases the piston 22 in the direction in which the piston rod 24 protrudes from the piston cylinder 20 (the direction of arrow B in FIG. 1). The piston cylinder 20 may be filled with damper oil or the like, and the piston damper 12 is designed to relieve an impact by the relative movement of the piston cylinder 20 and the piston rod 24 in the compression direction. Yes.

  A stepped portion 30 as a cylinder stopper is formed at the axially intermediate portion of the outer peripheral portion of the piston cylinder 20. The step portion 30 is formed at the boundary between the large diameter portion 20A on the insertion side of the piston rod 24 in the piston cylinder 20 and the small diameter portion 20B on the opposite side, and the outer diameter of the large diameter portion 20A is outside the small diameter portion 20B. It is larger (thicker) than the diameter.

  Further, the step portion 30 comes into contact with the cylinder stopper contact portion 14D of the case 14 when the piston cylinder 20 moves rearward (in the direction of arrow A in FIG. 1) with respect to the case 14. Accordingly, the stepped portion 30 of the piston cylinder 20 abuts against the cylinder stopper abutting portion 14D of the case 14, so that the movement of the piston cylinder 20 in the direction of arrow A in FIG. 1 is stopped. In this stopped state, the small diameter portion 20B of the piston cylinder 20 protrudes from the cylinder stopper contact portion 14D of the case 14 by a predetermined length.

  A ring-shaped convex portion 32 is formed at a portion of the piston cylinder 20 that is separated from the step portion 30 toward the small diameter portion 20B by a predetermined distance.

  On the other hand, a flange 34 as a rod stopper is formed at the axially intermediate portion of the outer peripheral portion of the piston rod 24. A portion of the piston rod 24 in front of the flange 34 is a slider 36 that constitutes a part of the piston rod 24. More specifically, the root portion 36 </ b> A of the slider 36 is connected (integrated) to the flange portion 34, and the slider 36 is interlocked with the piston rod 24. Further, the intermediate portion 36B of the slider 36 passes through the through hole 18 formed in the rod stopper contact portion 14E of the case 14, and the tip portion 36C of the slider 36 has a disk shape. The slider 36 may be separated from the piston rod 24. In this case, the root portion 36A of the slider 36 and the flange portion 34 of the piston rod 24 can be contacted and separated, and the slider 36 is pressed by the piston rod 24 in the direction of arrow B in FIG. In conjunction with the rod 24, the base portion 36A of the slider 36 is used as a disk-shaped stopper so that the base portion 36A of the slider 36 does not fall out of the through hole 18.

  Further, the flange portion 34 of the piston rod 24 comes into contact with the rod stopper contact portion 14E when the piston rod 24 moves forward (in the direction of arrow B in FIG. 1) with respect to the case 14. Accordingly, the movement of the piston rod 24 in the direction of the arrow B in FIG. 1 is stopped by the flange portion 34 coming into contact with the rod stopper contact portion 14E. In this stopped state, the slider 36 of the piston rod 24 protrudes from the rod stopper contact portion 14E of the case 14 by a predetermined length.

  Accordingly, in the state shown in FIG. 1, when the tip 20C of the piston cylinder 20 protruding from the cylinder stopper contact portion 14D of the case 14 is pressed forward (in the direction of arrow C in FIG. 1), it is fixed to the support member. With respect to the case 14, the piston cylinder 20 of the piston damper 12 moves in the direction of arrow B in FIG. Further, the flange portion 34 of the piston rod 24 contacts the rod stopper contact portion 14E of the case 14, and the movement of the piston rod 24 in the direction of arrow B in FIG. 1 is stopped. For this reason, the piston cylinder 20 moves in the compression direction (the direction of arrow B in FIG. 1) with respect to the piston rod 24, so that the impact acting on the tip portion 20C of the piston cylinder 20 can be mitigated.

  On the other hand, in the state shown in FIG. 1, when the tip 36C of the slider 36 protruding from the rod stopper contact portion 14E of the case 14 is pressed backward (in the direction of arrow D in FIG. 1), the case is fixed to the support member. 14, the piston rod 24 of the piston damper 12 moves in the direction of arrow D in FIG. 1. Further, the step portion 30 of the piston cylinder 20 contacts the cylinder stopper contact portion 14D of the case 14, and the backward movement of the piston cylinder 20 is stopped. For this reason, the piston rod 24 moves with respect to the piston cylinder 20 in the compression direction (the direction of arrow A in FIG. 1), and the impact acting on the tip portion 36 </ b> C of the slider 36 can be mitigated.

(Action / Effect)
Next, the operation and effect of this embodiment will be described.
In the shock absorber 10 of the present embodiment, a load acts on the tip 20C of the piston cylinder 20 protruding from the cylinder stopper contact portion 14D of the case 14, and the tip 20C of the piston cylinder 20 moves in the direction of arrow C in FIG. When pressed, the piston cylinder 20 moves in the direction of arrow C in FIG. 1 with respect to the case 14 fixed to the support member. At this time, the flange portion 34 of the piston rod 24 contacts the rod stopper contact portion 14E of the case 14, and the movement of the piston rod 24 in the direction of arrow B in FIG. For this reason, the piston cylinder 20 moves in the compression direction (the direction of arrow B in FIG. 1) with respect to the piston rod 24, and the impact acting on the tip portion 20C of the piston cylinder 20 can be mitigated.

  On the other hand, when a load acts on the tip 36C of the slider 36 protruding from the rod stopper contact portion 14E of the case 14 and the tip 36C of the slider 36 is pressed in the direction of arrow D in FIG. The piston rod 24 moves in the direction of arrow D in FIG. At this time, the step portion 30 of the piston cylinder 20 contacts the cylinder stopper contact portion 14D of the case 14, and the backward movement of the piston cylinder 20 stops. For this reason, the piston rod 24 moves with respect to the piston cylinder 20 in the compression direction (the direction of arrow A in FIG. 1), and the impact acting on the tip portion 36 </ b> C of the slider 36 can be reduced.

  Therefore, in this embodiment, the shock that is generated on the piston rod 24 side and the shock that is generated on the piston cylinder 20 side can be reduced with one shock absorber 10. For this reason, compared with the case where two shock absorbers are used, the mounting space of the shock absorber 10 can be reduced.

  In the present embodiment, the cylinder stopper is a stepped portion 30 formed at the boundary between the large diameter portion 20A and the small diameter portion 20B of the piston cylinder 20, and the small diameter portion 20B of the piston cylinder 20 protrudes from the case 14. It has become. For this reason, the small diameter part 20B of the piston cylinder 20 can be protruded from the case 14 with a simple configuration. As a result, the productivity of the shock absorber 10 can be improved.

  In this embodiment, the rod stopper is the flange portion 34 of the piston rod 24, and the slider 36 connected to the flange portion 34 protrudes from the case 14. Therefore, a part of the piston rod 24 can be reliably protruded from the case 14 with a simple configuration. As a result, the productivity of the shock absorber 10 can be improved.

(Application to sliding doors)
Next, the structure which attached the buffering device 10 of this embodiment to the sliding door as a supporting member is demonstrated according to FIGS.
As shown in FIG. 3, the shock absorber 10 of the present embodiment is provided on a sliding door 42 provided on a door frame 40. Although the entire illustration is omitted, the door frame 40 has a rectangular frame shape, and rails are formed on the upper surface of the lower frame of the door frame 40 (not shown) along the longitudinal direction of the lower frame. On the other hand, although the entire illustration is omitted, the sliding door 42 has a rectangular plate shape, and the wheel provided on the lower surface of the sliding door 42 not shown is located on the rail formed on the door frame 40. . Therefore, the sliding door 42 can move in the closing direction (arrow E direction in FIG. 3) and the opening direction (arrow F direction in FIG. 3) along the rail formed on the door frame 40.

  As shown in FIG. 4, when the sliding door 42 is moved to the closed position side, the closing direction side edge portion 42 </ b> A of the sliding door 42 approaches the closing direction side vertical frame 40 </ b> A of the door frame 40.

  As shown in FIG. 5, when the sliding door 42 is moved to the open position side, the opening direction side edge portion 42 </ b> B of the sliding door 42 approaches the opening direction side vertical frame 40 </ b> B of the door frame 40.

  As shown in FIG. 6, a groove 46 is formed in the center in the width direction of the upper surface 42 </ b> C of the sliding door 42 along the moving direction of the sliding door 42. In addition, an attachment recess 48 of the shock absorber 10 is formed at an end of the upper surface 42C of the sliding door 42 on the side edge 42A side, and the attachment recess 48 and the groove 46 are in communication with each other.

  The width W1 of the mounting recess 48 is wider than the width W2 of the groove 46, and stepped portions 49 are formed at both ends in the width direction of the opening of the mounting recess 48. Further, the coupling portions 14C of the mounting portions 14B of the case 14 are fixed to the respective step portions 49 of the mounting recess 48 by fixing members (not shown) such as screws or by bonding.

  A stopper 50 is attached to the lower surface 40D of the upper frame 40C in the door frame 40. The stopper 50 includes a rectangular plate-shaped attachment portion 50A and a contact portion 50B having a triangular shape in a side view protruding downward from the central portion in the width direction of the attachment portion 50A. The mounting portion 50A of the stopper 50 is fixed to the lower surface 40D of the upper frame 40C of the door frame 40 by a fixing member (not shown) such as a screw or by bonding. Further, the contact portion 50B of the stopper 50 enters the inside of the groove 46 when the sliding door 42 moves in the direction of the opening direction side vertical frame 40B of the door frame 40.

  As shown in FIG. 3, when the sliding door 42 is in the middle between the closed position and the open position, the piston cylinder 20 of the piston damper 12 of the shock absorber 10 moves from the case 14 to the closing direction side vertical frame 40 </ b> A of the door frame 40. While projecting a predetermined length toward the side, the sliding door 42 also projects from the closing direction side edge 42A. In addition, the slider 36 of the piston damper 12 of the shock absorber 10 protrudes from the case 14 toward the contact portion 50B of the stopper 50 by a predetermined length.

  Therefore, as shown in FIG. 4, when the sliding door 42 approaches the closed position, the tip portion 20C of the piston cylinder 20 abuts on the closing direction side vertical frame 40A of the door frame 40, and the piston cylinder 20 moves in the direction of arrow C in FIG. To be pushed into. Therefore, the piston cylinder 20 moves in the compression direction (arrow B direction in FIG. 1) with respect to the piston rod 24 so that the impact at the time of closing the sliding door 42 acting on the tip portion 20C of the piston cylinder 20 can be alleviated. It has become.

  On the other hand, as shown in FIG. 5, when the sliding door 42 approaches the open position, the tip 36C of the slider 36 comes into contact with the contact 50B of the stopper 50, and the slider 36 is pushed in the direction of arrow D in FIG. It has become. Therefore, the piston rod 24 moves with respect to the piston cylinder 20 in the compression direction (the direction of arrow A in FIG. 1), and the impact when the sliding door 42 acting on the tip portion 36C of the slider 36 is opened can be mitigated. ing.

(Action / Effect)
Next, the operation of this embodiment will be described.
In the present embodiment, as shown in FIG. 3, when the sliding door 42 is in the middle between the closed position and the open position, the piston cylinder 20 of the piston damper 12 of the shock absorber 10 is closed on the side edge in the closing direction of the sliding door 42. The slider 36 of the piston damper 12 protrudes from the case 14 toward the contact portion 50B of the stopper 50 by a predetermined length.

  Therefore, as shown in FIG. 4, when the sliding door 42 approaches the closed position, the tip portion 20C of the piston cylinder 20 abuts on the closing direction side vertical frame 40A of the door frame 40, and the piston cylinder 20 moves in the direction of arrow C in FIG. It is pushed into. For this reason, the piston cylinder 20 moves with respect to the piston rod 24 in the compression direction (the direction of arrow B in FIG. 1), and the impact when the sliding door 42 acting on the tip portion 20C of the piston cylinder 20 is closed can be alleviated.

  On the other hand, as shown in FIG. 5, when the sliding door 42 approaches the open position, the tip 36C of the slider 36 comes into contact with the contact 50B of the stopper 50, and the slider 36 is pushed in the direction of arrow D in FIG. For this reason, the piston rod 24 moves in the compression direction (the direction of arrow A in FIG. 1) with respect to the piston cylinder 20, and the impact when the sliding door 42 acting on the tip portion 36C of the slider 36 is opened can be alleviated.

  Therefore, in this embodiment, the impact at the time of opening and closing of the sliding door 42 can be relieved with one shock absorber 10. As a result, the mounting space for the shock absorber 10 can be made smaller than when two shock absorbers are used, and the shock absorber can be easily attached to the upper part of the sliding door 42.

(Other embodiments)
While the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to the above-described embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art. For example, the shape of the case 14 of the buffer means support member is not limited to the shape of the above-described embodiment, and may be another shape or may be an integral structure with the support member.

  In the above embodiment, the shock absorber according to the present invention is applied to the sliding door 42. However, the shock absorber according to the present invention is provided at another opening / closing device other than the sliding door, for example, at the front of the drawer, and is opened and closed by a hinge. The present invention can also be applied to a front plate that rotates and moves to a position.

  Further, the shock absorber of the present invention is not limited to the opening / closing device, and can be used for other moving devices that move in one direction and the opposite direction.

10 shock absorber 12 piston damper 14 case (buffer means support member)
14D Cylinder stopper contact portion 14E Rod stopper contact portion 20 Piston cylinder 20C Piston cylinder tip 22 Piston 24 Piston rod 26 Spring 30 Piston cylinder step (cylinder stopper)
34 collar (rod stopper)
36 Slider (part of piston rod)
36C Slider tip

Claims (3)

A piston cylinder provided with a cylinder stopper on the outer periphery, a piston inserted movably in the piston cylinder, a piston rod connected to the piston and provided with a rod stopper on the outer periphery, and the piston cylinder provided in the piston cylinder A spring for urging the piston in a direction in which the piston rod protrudes from the piston cylinder;
A buffer means support member for accommodating the buffer means movably in the direction of load application;
The piston cylinder is provided on one end side in the moving direction of the buffer means in the buffer means support member, in contact with the cylinder stopper and with a part of the piston cylinder protruding from the buffer means support member. A cylinder stopper abutment for stopping the movement of
The piston in the state where the shock absorber support member is provided on the other end side in the movement direction of the shock absorber and is in contact with the rod stopper so that a part of the piston rod protrudes from the shock absorber support member. A rod stopper contact portion for stopping the movement of the rod;
Shock absorber.   2. The shock absorber according to claim 1, wherein the cylinder stopper is a step portion between a small diameter portion and a large diameter portion of the piston cylinder, and the small diameter portion of the piston cylinder projects from the buffer means support member.   3. The shock absorber according to claim 1, wherein the rod stopper is a flange portion, and a part of the piston rod protruding from the buffer means supporting member is a slider interlocking with the flange portion.