JP2015203180A - Shock absorber of connected door - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shock absorber capable of absorbing a shock when closing a connected door of a folding door, and capable of closing the connected door up tp the end.SOLUTION: A shock absorber is used for a connected door of including a pair of door panels rotatably connected in the horizontal direction by one hinge, and comprises a first body member 20 installed on one reverse surface of the pair of door panels, a second body member 21 installed on the other reverse surface and spring members 22 and 23 tensioned between the first body member and the second body member and mutually imparting tension force between both members. When the shock absorber is installed on the door panel, at least one spring member is positioned on the surface side of the door panel more than a rotary shaft when an angle between surfaces of the first body member and the second body member is a first predetermined angle or more, and energizes the pair of door panels in the closing direction, and is positioned on the reverse surface side more than the rotary shaft when the engle between the surfaces of the first body member and the second body member is less than the above-mentioned first predetermined angle, and energizes the pair of door panels in the opening direction.

Description

  The present invention relates to a shock absorber for a connecting door capable of adjusting a rotation speed when opening and closing door plates connected by a hinge such as a folding door.

  As cushioning devices for folding doors, Patent Documents 1 and 2 disclose that a pair of attachment members attached to a connecting portion of the door plates can be rotated with respect to each other in order to brake the sudden rotation between the door plates when closing the folding door. A connecting hinge (hinge) portion; a damper provided on one of the mounting members; a damper that is compressed in the horizontal direction and repels; and a braking mechanism portion that is attached to the damper; A shock absorber configured to compress a damper by being pressed by one attachment member when the folding door is closed is disclosed.

Japanese Patent No. 5035967 Japanese Patent No. 5336719

  However, in the conventional shock absorbers described in Patent Documents 1 and 2, the pivot shafts of a plurality of hinges originally attached to the connecting portion of the folding door and the pivot shafts of the hinges of the shock absorber are coaxial. In addition, it is necessary to precisely set and adjust the mounting position of the shock absorber to the folding door, and if the setting and adjustment are not performed properly and these pivot shafts are not arranged in a straight line, the original opening / closing function of the folding door is impaired. There was a risk of it. In particular, the rotation axis position of the hinge varies from product to product and from manufacturer to manufacturer, and the objects that can be supported by the hinge of the conventional shock absorber are quite limited, and the rotation shaft is coaxial at the shock absorber mounting position. It was very difficult to post-adjust so as to be.

  Furthermore, the conventional shock absorbers described in Patent Documents 1 and 2 absorb the impact by braking the rotation speed when the folding door is closed, and do not have a function of biasing in the closing direction. For this reason, the rotation stopped during the closing, and there was a possibility that the closing could not be completed.

  Furthermore, since the conventional shock absorbers described in Patent Documents 1 and 2 do not have a function of urging in the opening direction, a certain amount of force is required when opening the folding door.

  Therefore, the object of the present invention is that alignment with the axial position of the hinge attached to the connecting portion of the folding door is not required or can be performed very easily, and is compatible with various hinges having different axial positions. It is to provide a shock absorber for a connecting door that is possible.

  Another object of the present invention is to provide a shock absorber for a connecting door that absorbs an impact when closing the connecting door and can completely close the connecting door.

  According to the present invention, a shock absorber used for a connecting door including a pair of door plates that are rotatably connected in a horizontal direction with respect to a rotation axis set by at least one hinge attached to the back surface of the door plate. A first body member embedded and attached to one back surface of the pair of door plates, a second body member embedded and attached to the other back surface of the pair of door plates, a first body member, and a second body member At least one spring member that is stretched between the main body members and applies a pulling force between the two members. The first body member and the second body member are directly connected by only at least one spring member. When the shock absorber is attached to a pair of door plates, the at least one spring member rotates when the angle between the surfaces of the first body member and the second body member is equal to or greater than the first predetermined angle. Energized in a direction to close the pair of door plates located on the surface side of the door plates from the moving shaft, and the angle between the surfaces of the first body member and the second body member is less than the first predetermined angle described above Is configured to be biased in the direction of opening a pair of door plates located on the back side of the rotating shaft.

  By at least one spring member, the angle between the surfaces of the first main body member and the second main body member is biased in a direction to close the door plate at a certain angle (a first predetermined angle) or more, and conversely at an angle less than a certain angle. Since the door plate is configured to be biased in the opening direction, it is possible to obtain a soft close function and a function of slowly and reliably closing the door plate in the direction in which the door plate is closed. When the angle between the main body member 1 and the second main body member is less than the first predetermined angle described above, the door plate is biased in the opening direction. It can be fully opened. Particularly in the present invention, since the first main body member and the second main body member are directly connected by only at least one spring member, this shock absorber is provided with a hinge member for pivot support. Not. For this reason, the rotation set by the hinge of the folding door is performed only by rough alignment without accurately positioning the shock absorber to the axial position (rotation shaft) of the hinge attached to the connecting portion of the folding door. The moving shaft automatically becomes the rotating shaft of this shock absorber. Therefore, alignment is not necessary or very easy, and it is possible to cope with various hinges having different axial positions. Therefore, the shock absorber of the present invention is very versatile with respect to the hinge of the folding door, and it is not necessary to select a hinge type and to prepare a hinge dedicated to the shock absorber. This means there is no need to increase the number of hinge varieties. Moreover, such versatility can be obtained with a very simple structure.

  The first main body member and the second main body member are preferably configured to be rotatable with respect to the above-described rotation axis without being pivotally supported by the hinge member. Because it is not pivotally supported, as described above, it is not necessary or very easy to align the hinge position of the hinge attached to the connecting part of the folding door, and it can be used for various hinges with different axis positions. It becomes.

  It is also preferable that at least one spring member is adjustable in distance and / or spring length from the above-described rotation shaft. By adjusting the distance from the rotation axis, it is possible to adjust the first predetermined angle that is a threshold value for urging the doorboard in the closing direction or in the opening direction. The biasing force can be adjusted by adjusting the spring length.

  At least one damper member that is attached to the first body member and absorbs an impact applied in the axial direction; and an abutting surface that is attached to the second body member and abuts on the tip end in the axial direction of the at least one damper member. An abutting member having an axial tip of the at least one damper member and an abutting surface of the abutting member such that an angle between the surfaces of the first body member and the second body member is the first. It is also preferable to be configured so as to come into contact when the angle exceeds a predetermined angle of 2. By providing such at least one damper member, a braking function when closing the door plate is obtained, and a buffering action against the closing impact is obtained. The braking force against the impact can be changed depending on the number of damper members provided.

  In this case, it is preferable that the contact member can move the contact surface in the front-rear direction (a direction toward and away from the damper member) in order to adjust a position where the contact member contacts the at least one damper member. Furthermore, the contact member is more preferably configured such that the contact surface is movable in the front-rear direction by a screw that can be screwed onto the second body member. By adjusting the position of contact with the damper member, the braking force against the impact and the braking start position can be finely adjusted.

  According to the present invention, it is possible to obtain a soft closing function and a function of slowly and reliably closing to the end in the direction of closing the door plate, and it is possible to open slowly with a small force in the direction of opening the door plate. Furthermore, the rotation axis set by the hinge of the folding door only by rough alignment without accurately positioning this shock absorber to the axial position (rotation axis) of the hinge attached to the connecting part of the folding door. Automatically becomes the pivot axis of this shock absorber. Therefore, alignment is not necessary or very easy, and it is possible to cope with various hinges having different axial positions. Therefore, the shock absorber of the present invention is very versatile with respect to the hinge of the folding door, and it is not necessary to select a hinge type and to prepare a hinge dedicated to the shock absorber. This means there is no need to increase the number of hinge varieties. Moreover, such versatility can be obtained with a very simple structure.

It is a figure which shows schematically the structure of the whole folding door at the time of attaching the buffering device in one Embodiment of this invention to a folding door. It is the (A) side view, (B) front view, and (C) CC sectional view taken on the line of FIG. 2 (B) which show schematically the structure of the buffering device in embodiment of FIG. FIG. 2 is a perspective view schematically showing the shock absorber in the embodiment of FIG. 1 from the front direction in a state where the first main body member and the second main body member are rotated with respect to each other. It is a perspective view which shows roughly the buffer device in embodiment of FIG. 1 from the back direction in the state which rotated the 1st main body member and the 2nd main body member mutually. It is a perspective view which shows roughly one spring member and its attachment components of the buffering device in embodiment of FIG. FIG. 2 is a perspective view schematically showing one damper member of the shock absorber in the embodiment of FIG. 1. It is explanatory drawing explaining the urging | biasing direction of the spring member in the buffering device in embodiment of FIG.

  FIG. 1 schematically shows a configuration of the entire folding door when the shock absorber in one embodiment of the present invention is attached to the folding door. Here, as a mere example, a case of, for example, a top-folding type folding door formed by connecting a pair of door plates with three hinges is described. Therefore, the present invention is also applied to folding doors in which three or more door plates are sequentially connected.

  In the figure, 10 and 11 are a pair of door plates, 12, 13 and 14 are attached to the connecting portions 15 of the back surfaces 10 a and 11 a of these door plates 10 and 11, and the door plates 10 and 11 are attached to the door plate rotation shaft 34 (FIG. 7). Reference numerals 3) and 16 are connected to the connecting portions 15 of the rear surfaces 10a and 11a of the door plates 10 and 11, respectively.

  In this specification, the back surface of the doorboard refers to the surface on the side where hinges and shock absorbers are attached and these can be seen. Therefore, FIG. 1 shows the back side of the door plate. FIG. 1 shows a state in which the folding door (door plate) is completely closed. When the folding door (door plate) is opened, the connecting portion 15 moves in the rear direction in the figure.

  The number of hinges may be any number other than 3, and the type thereof is not limited to the illustrated example. Furthermore, the number of shock absorbers 16 is merely an example, and the number may be any number other than one. Moreover, if the mounting position of the shock absorber 16 is also the connection part 15 of the door plates 10 and 11, it is arbitrary.

  FIG. 2 schematically shows the configuration of the shock absorber 16 in the present embodiment. (A) is a state seen from the side surface, (B) is a state seen from the front surface, and (C) is a state shown in FIG. FIG. 3 schematically shows the shock absorber 16 in the present embodiment from the front direction in a state where the first main body member and the second main body member are rotated with respect to each other. FIG. 4 schematically shows the shock absorber according to this embodiment from the back side in a state where the first main body member and the second main body member are rotated with respect to each other.

  As shown in these drawings, the shock absorber 16 includes a first main body member 20 and a second main body member 21, and two stretched members between the first main body member 20 and the second main body member 21. Spring members 22 and 23, two damper members 24 and 25 attached to the first body member 20, contact members 26 of the damper members 24 and 25 attached to the second body member 21, and their positions And an adjusting screw 27.

  The 1st main body member 20 and the 2nd main body member 21 are shape | molded, for example from resin materials, such as ABS, or a lightweight metal material, and are opened and formed in the connection part 15 of the back surfaces 10a and 11a of the door plates 10 and 11. It is embedded in the concave notch portion and is attached to the back surfaces 10a and 11a of the door plates 10 and 11 by wood screws (not shown) passing through the four screw holes 20b and 21b formed in the flange portions 20a and 21a. Accordingly, the front surfaces 20c and 21c of the first main body member 20 and the second main body member 21 (surfaces shown in FIG. 2B) appear on the back surfaces 10a and 11a of the door plates 10 and 11.

  On the surfaces 20c and 21c side of the first main body member 20 and the second main body member 21, concave grooves 20e and 21e and concave grooves 20f formed by opening one ends of the connecting portion side end faces 20d and 21d, 21f are formed respectively. As shown in FIG. 2B, when the door plates 10 and 11 are completely closed, the concave grooves 20e and 21e are connected to each other to form one concave groove that opens only on the surface 20c side, and the concave grooves 20f and 21f. Are connected to each other to form one concave groove that opens only on the surface 20c side. As shown in the drawing, the spring member 22 is inserted and attached in the one groove, and the spring member 23 is inserted and attached in the other groove.

  The first main body member 20 and the second main body member 21 are directly connected to each other only by the spring members 22 and 23 and are not pivotally supported by a hinge member or the like.

  The spring members 22 and 23 are coiled tension springs and are formed of stainless steel in the present embodiment, but may be formed of other metal materials having spring properties. As shown in FIG. 5, each of the spring members 22 and 23, for example, the spring member 23, has hook portions 23 a and 23 b at both ends hooked on thin cylindrical center portions 28 a and 29 a of collars 28 and 29, respectively. Is attached. The collars 28 and 29 are formed of a resin material such as polyacetal, for example, and thick cylindrical side portions 28b and 29b and 28c and 29c are integrally formed coaxially on both sides of the thin cylindrical central portions 28a and 29a, respectively. Is formed.

  Through holes 28d and 29d are formed at the axial centers of the collars 28 and 29, respectively. As shown in FIG. 2A, the first main body member 20 and the second main body member 21 have a plurality of position adjustment holes 32 penetrating from the side surfaces 20g and 21g through the both side walls of the concave grooves 20f and 21f. And 33 are provided. By inserting insertion pins 30 and 31 for attachment into one of the plurality of position adjustment holes 32 and 33 and the through holes 28d and 29d of the collars 28 and 29, respectively, the spring member 23 is inserted. Is stretched between the first body member 20 and the second body member 21 so as to give a pulling force to each other. Depending on which of the plurality of position adjusting holes 32 and 33 the insertion pins 30 and 31 are inserted into, the central axis 35 (see FIG. 7) of the spring member 23 and the pivot shaft 34 (see FIG. 7) of the door plate And the spring length can be adjusted. By adjusting the distance from the rotation shaft 34, it is possible to adjust the first predetermined angle which is a threshold value for urging the doorboard in the closing direction or in the opening direction. Further, the urging force of the spring member 23 can be adjusted by adjusting the spring length. The above configuration and function are the same for the spring member 22.

  As shown in FIG. 4, the two damper members 24 and 25 are inserted and mounted in the two cylindrical non-through holes 20 h and 20 i provided on the connecting portion side end surface 20 d of the first main body member 20, respectively. Has been. As shown in FIG. 6, each of the damper members 24 and 25, for example, the damper member 24 is filled with oil in a pressure chamber having an orifice (not shown) in a cylindrical casing 24 a and connected to the piston. This is a soft absorber that absorbs impact energy applied in the axial direction by utilizing the hydraulic pressure generated in the pressure chamber when oil flows out from the orifice when the tip of the rod 24b is pressed in the axial direction. The same applies to the damper member 25. This type of soft absorber is commercially available.

  As shown in FIGS. 2B and 2C, a non-through hole 21j having a rectangular opening is formed on the end surface 21d of the second main body member 21 as shown in FIGS. 2B and 2C. A substantially rectangular parallelepiped contact member 26 is attached to be movable in the front-rear direction (the axial direction of the non-through hole 21j). This attachment and movement of the contact member 26 is performed by a position adjusting screw 27 that is screwed into a screw hole 21k formed coaxially with the central axis of the non-through hole 21j. The front surface of the abutting member 26 constitutes an abutting surface 26a having a concave arcuate cross section with which the axial ends of the piston rods of the damper members 24 and 25 abut, and the axially leading ends of the damper members 24 and 25. The contact surface 26a of the contact member 26 is such that the door plates 10 and 11 are urged in the closing direction and the angle between the surfaces 20c and 21c of the first body member 20 and the second body member 21 is a second predetermined value. When it exceeds the angle, it abuts and absorbs the impact. By adjusting the position of contact with the damper members 24 and 25 by moving the contact surface 26a of the contact member 26 with the position adjusting screw 27, the braking force against the impact and the braking start position can be finely adjusted.

  By providing such damper members 24 and 25, a braking function when closing the door plate is obtained, and a buffering action against the closing impact is obtained. The braking force against the impact can be changed depending on the number of damper members provided.

  In the present embodiment, two damper members are used. However, the number of damper members may be any number other than two depending on the magnitude and time of impact to be absorbed, and the type of damper member. Can also be appropriately selected.

  In order to attach the shock absorber 16 of the present embodiment to the pair of door plates 10 and 11, the back surfaces 10a and 11a of the pair of door plates 10 and 11 to which hinges 12, 13 and 14 are attached in advance through axial alignment are connected. The shock absorber 16 is attached to the part 15 by rough axis alignment without performing it accurately. Since the first main body member 20 and the second main body member 21 are directly connected by only two spring members 22 and 23, the shock absorber 16 of the present embodiment has a hinge member for pivot support. Is not provided. For this reason, only the rough alignment is performed without accurately positioning the shock absorber 16 at the position of the pivot shaft of the hinges 12, 13 and 14 attached to the connecting portion 15 of the pair of door plates 10 and 11. Thus, the rotation axis set by the hinges 12, 13 and 14 automatically becomes the rotation axis of the shock absorber 16. Therefore, alignment is not necessary or very easy, and it is possible to cope with various hinges having different axial positions. Therefore, the shock absorber 16 of the present embodiment is very versatile with respect to the hinge of the folding door, and it is not necessary to select a hinge type and to prepare a hinge dedicated to the shock absorber 16. This means that there is no need to increase the number of hinge varieties. Moreover, such versatility can be obtained with a very simple structure.

  Next, the urging directions of the spring members 22 and 23 in the shock absorber according to the present embodiment embedded and attached to the pair of door plates 10 and 11 will be described with reference to FIG. 7 viewed from above the door plates 10 and 11. .

  As shown in FIG. 7A, in the state where the pair of door plates 10 and 11 are completely closed, the angle between the surfaces 20c and 21c of the first body member 20 and the second body member 21 is 180 °. The spring members 22 and 23 have a relatively short spring length a (for example, a = 40 mm). In this case, the central shaft 35 of the spring members 22 and 23 is positioned on the surface side of the door plate with respect to the rotation shaft 34 of the door plate, and the spring members 22 and 23 urge the door plates 10 and 11 in the closing direction.

  As shown in FIG. 7 (B), when the pair of door plates 10 and 11 are further opened, the angle between the surfaces 20c and 21c of the first body member 20 and the second body member 21 is about 120 °. The spring members 22 and 23 have the longest spring length b (for example, b = 46 mm). In this case, the central axis 35 of the spring members 22 and 23 is on the pivot axis 34 of the door plate, and the spring members 22 and 23 do not urge the door plates 10 and 11 in the opening direction or the closing direction.

  As shown in FIG. 7 (C), when the pair of door plates 10 and 11 are in the opening direction as compared with the case of FIG. 7 (B), between the surfaces 20c and 21c of the first main body member 20 and the second main body member 21. Is about 110 °, and the spring members 22 and 23 have a spring length c (for example, c = 45.8 mm) slightly longer than the longest. In this case, the central axis 35 of the spring members 22 and 23 is on the back side of the door plate with respect to the rotation shaft 34 of the door plate. Therefore, the spring members 22 and 23 urge the door plates 10 and 11 in the opening direction.

  As shown in FIG. 7 (D), when the pair of door plates 10 and 11 are in the closing direction as compared with the case of FIG. 7 (B), between the surfaces 20c and 21c of the first body member 20 and the second body member 21. Is about 130 °, and the spring members 22 and 23 have a slightly longer spring length c (for example, c = 45.8 mm) than the longest. In this case, the central axis 35 of the spring members 22 and 23 is on the surface side of the door plate from the door plate rotation shaft 34, and thus the spring members 22 and 23 bias the door plates 10 and 11 in the closing direction.

  Since the shock absorber according to the present embodiment includes the spring members 22 and 23 that perform urging, the damper members 24 and 25, and the abutting member 26 as described above, the shock absorber operates as follows.

  Initially, it is assumed that the folding door is completely closed and the pair of door plates 10 and 11 are in a state as shown in FIG. In this state, for example, the connecting portion 15 of the door plates 10 and 11 is pushed in the back direction in the drawing to open the folding door, and between the first main body member 20 of the shock absorber 16 and the surfaces 20c and 21c of the second main body member 21. When the angle is less than a certain angle (first predetermined angle, about 120 ° in the example of FIG. 7), the spring members 22 and 23 urge the door plates 10 and 11 in the opening direction as shown in FIG. 7C. To do. Thereby, while being able to obtain the function which opens a doorplate slowly, it can open a doorplate with small force.

  When closing the folding door, the angle between the surfaces 20c and 21c of the first body member 20 and the second body member 21 of the shock absorber 16 is a certain angle (first predetermined angle, about 120 ° in the example of FIG. 7) or more. Then, as shown in FIG. 7D, the spring members 22 and 23 urge the door plates 10 and 11 in the closing direction. As a result, a soft close function for slowly closing the door panel is obtained, and furthermore, since this urging is performed until the door panel is completely closed, the door panel can be reliably closed to the end. Furthermore, when the door plate is closed, if the angle between the surfaces 20c and 21c of the first main body member 20 and the second main body member 21 is equal to or larger than the second predetermined angle, the tip ends of the damper members 24 and 25 in the axial direction are used. And the contact surface 26a of the contact member 26 are in contact with each other, and the damper members 24 and 25 are operated, whereby a braking function is obtained, and the closing impact is greatly reduced.

  As described above, according to the shock absorber 16 of the present embodiment, the angle between the surfaces 20c and 21c of the first body member 20 and the second body member 21 is at an angle by the two spring members 22 and 23. (First predetermined angle, about 120 ° in the example of FIG. 7) or more, the door plates 10 and 11 are urged in the closing direction, and less than this certain angle, the door plates 10 and 11 are urged in the opening direction. It is configured. For this reason, in the direction which closes the door plates 10 and 11, a soft closing function and the function which closes slowly and reliably can be obtained, and also in the direction which opens the door plates 10 and 11, it can open with a small force. Further, the action of the damper members 24 and 25 provides a braking function in the closing direction, and the closing impact is greatly reduced. In addition, what is necessary is just to provide another damper member separately in order to obtain the braking function with respect to an opening direction.

  Since the distance between the central axis of the spring member and the pivot shaft 34 of the door plate can be adjusted depending on the insertion position of the insertion pin, the first threshold value that determines whether the door plate is biased in the closing direction or in the opening direction. The predetermined angle can be adjusted. Further, since the spring length can be adjusted by the insertion position of the insertion pin, the urging force of the spring member can be adjusted. Of course, it is needless to say that the biasing force can be adjusted by the type and number of the spring members themselves.

  The braking force against the impact can be changed depending on the number and type of damper members provided. Further, the contact surface 26a of the contact member 26 is moved by a position adjusting screw 27 that can be screwed to the second body member 21 to adjust the position of contact with the damper members 24 and 25, thereby suppressing the impact. The power and braking start position can be easily finely adjusted.

  According to the present embodiment, various functions as described above can be obtained with a simple structure.

  The shape, structure, dimensions, and materials described above are merely examples, and it goes without saying that the shock absorber according to the present invention can be composed of various other shapes, structures, dimensions, and materials. That is, all of the embodiments described above are illustrative of the present invention and are not limited, and the present invention can be implemented in various other modifications and changes. Therefore, the scope of the present invention is defined only by the claims and their equivalents.

DESCRIPTION OF SYMBOLS 10, 11 Door plate 10a, 11a Back surface 12, 13, 14 Hinge 15 Connection part 16 Shock absorber 20 1st main body member 20a, 21a Flange part 20b, 21k, 21b Screw hole 20c, 21c Surface 20d, 21d Connection part side end surface 20e , 21e, 20f, 21f Groove 20g, 21g Side 20h, 20i, 21j Non-through hole 21 Second body member 22, 23 Spring member 23a, 23b Hook 24, 25 Damper member 24a Jacket 24b Piston rod 26 Contact member 26a Contact surface 27 Position adjusting screw 28, 29 Collar 28a, 29a Central portion 28b, 28c, 29b, 29c Side portion 28d, 29d Through hole 30, 31 Insertion pin 32, 33 Position adjustment hole 34 Rotating shaft 35 Central axis

Claims (6)

  A shock absorber for use in a connecting door including a pair of door plates that are rotatably connected in a horizontal direction with respect to a rotation axis set by at least one hinge attached to the back surface of the door plate, A first body member embedded and attached to one of the back surfaces of the door plate; a second body member embedded and attached to the other back surface of the pair of door plates; the first body member and the And at least one spring member that is stretched between the second body members and applies a pulling force between the two members. The first body member and the second body member are directly When the shock absorber is attached to the pair of door plates, the at least one spring member includes the first main body member and the second main body. Between the surfaces of parts When the angle is equal to or greater than the first predetermined angle, the first shaft member and the second body member are biased in the direction of closing the pair of door plates located on the surface side of the door plates with respect to the pivot shaft. When the angle between the front surfaces of the main body member is less than the first predetermined angle, the body member is configured to be biased in the direction of opening the pair of door plates located on the back surface side from the rotation shaft. A connecting door shock absorber.   2. The connecting door according to claim 1, wherein the first main body member and the second main body member are configured to be rotatable with respect to the rotation shaft without being pivotally supported by a hinge member. Shock absorber.   3. The coupling door shock absorber according to claim 1, wherein the at least one spring member is capable of adjusting a distance from the rotation shaft and / or a spring length. 4.   At least one damper member that is mounted on the first body member and absorbs an impact applied in the axial direction, and the tip end in the axial direction of the at least one damper member that is attached to the second body member abut on each other. A contact member having a contact surface, and the axial tip of the at least one damper member and the contact surface of the contact member are the first body member and the second member. The buffer for a connecting door according to any one of claims 1 to 3, wherein the body door member is configured to come into contact when an angle between surfaces of the main body member is equal to or larger than a second predetermined angle. apparatus.   The buffer device for a connecting door according to claim 4, wherein the contact member is movable in the front-rear direction on the contact surface in order to adjust a position of contact with the at least one damper member.   The said contact member is comprised so that the said contact surface can move to the front-back direction with the screw | thread which can be screwed together to a said 2nd main body member, The buffer device of the connection door of Claim 5 characterized by the above-mentioned. .

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