Braking device for self-closing door

Abstract

To provide a braking device applicable to a self-closing door in which a door body is supported for opening rotation to both front and rear sides from a closing position.SOLUTION: A braking device includes an urging body 10 having a linear damper 7 installed on a door side surface 2A, and an operating body 8 fixed to a right and left opening vertical frame 1A of an opening part 1 facing the door side surface 2A for operating an operated part 20 of the energizing body 10. The urging body 10 includes a cylinder 11 constituting the linear damper 7, a rod 12 provided so as to be advanceable and retreatable with respect to the cylinder 11, an urging spring 14 for applying an urging force in a direction toward an advancing position to the rod 12, and an operated part 20 projecting from the door side surface 2A by receiving the urging force of the urging spring 14. The operation body 8 includes an operation surface 22 formed in both directions of a front direction and a rear direction across a right and left direction and is configured such that when the door body 2 is rotated for displacement toward a closing position from an opening position in both the front and rear directions, the operated part 20 is brought into contact with the operation surface 22, and the rod 12 is pushed into the cylinder 11.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a braking device that is applied to a self-closing door that includes a door body that closes an opening and a self-closing pivot hinge that supports the door body so that it can be opened from the closed position to both the front and rear, and that brakes the self-closing speed of the door body. Examples of the self-closing pivot hinge include a gravity hinge and a free hinge. [Background technology]

[0002] The braking device of the present invention uses a linear damper as a braking element for the self-closing speed of the door body, and the use of a linear damper as a braking element is disclosed in, for example, Patent Document 1. The hinge described in Patent Document 1 is composed of a main hinge piece and a sub-hinge piece, a shaft that pivots the ends of both hinge pieces, a return spring provided on the outer periphery of the shaft, and a linear damper (shock absorber) that is fixed to the main hinge piece and constitutes the braking device. The main hinge piece is attached to a support member such as a pillar with the linear damper embedded therein, and the sub-hinge piece is attached to the door body (door). When the door body is closed, the rod of the linear damper is moved to the retraction side by the sub-hinge piece. When the door body is opened from this state, the return spring is twisted and rotational power is stored, and the rod gradually advances to its advance limit. When the opening operation of the door body is released, the door body closes automatically in the closing direction due to the restoring force of the return spring, and from the point when the secondary butterfly piece comes into contact with the rod, the approaching movement of the secondary butterfly piece relative to the main butterfly piece is braked by a linear damper, and the door body closes slowly just before reaching the closed position. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Microfilm of Utility Model Application No. 50-118017 (Utility Model Application No. 52-30562) Summary of the Invention [Problem to be solved by the invention]

[0004] The hinge in Patent Document 1 uses a hinge structure called a flag hinge. Therefore, although the invention in Patent Document 1 can be applied to self-closing doors in which the door body is supported to rotate so that it can be opened only in one direction, the front or rear, it has the disadvantage that it cannot be applied to self-closing doors in which the door body is supported by a pivot hinge and is supported to rotate so that it can be opened in both directions, the front and rear, from the closed position.

[0005] An object of the present invention is to provide a braking device that can be applied to a self-closing door whose door body is supported so as to be able to rotate openably on both the front and rear sides from a closed position. [Means for solving the problem]

[0006] The present invention is directed to a braking device applied to a self-closing door that includes a door body 2 that closes an opening 1 and a self-closing pivot hinge 3 that pivotally supports the door body 2. The pivot hinge 3 pivotally supports the door body 2 so that the door body 2 can be opened in both forward and backward directions between a closed position where the door body 2 closes the opening 1 and an open position where the opening 1 is opened. The braking device includes an urging body 10 including a linear damper 7 installed on the door side surface 2A on the base end side of the door body 2 supported by the pivot hinge 3, and an operating body 8 that is fixed to the left and right vertical opening frames 1A of the opening 1 facing the door side surface 2A and operates the operated part 20 of the urging body 10. The biasing body 10 includes a cylinder 11 constituting the linear damper 7, a rod 12 provided so as to be able to retract from the cylinder 11, a biasing spring 14 that applies a biasing force to the rod 12 in a direction toward the advanced position, and an operated part 20 that protrudes from the door side surface 2A by receiving the biasing force of the biasing spring 14. The operating body 8 includes an operating surface 22 formed in both the front and rear directions sandwiching the left and right direction. The operating body 8 is characterized in that when the door body 2 is pivotally displaced from the open position in both the front and rear directions toward the closed position, the operated part 20 comes into contact with the operating surface 22, and the rod 12 is pushed into the cylinder 11.

[0007] A rod 12 constituting the linear damper 7 is biased by a biasing spring 14 and protrudes from the door side surface 2A. The tip of the rod 12 protruding from the door side surface 2A serves as an operated portion 20.

[0008] The linear damper 7 is housed in a damper case 16 with the rod 12 protruding to the outside, and the damper case 16 is fixed to the door side surface 2A by a fastener 19.

[0009] Another aspect of the present invention is directed to a braking device that is applied to a self-closing door that includes a door body 2 that closes an opening 1 and a self-closing pivot hinge 3 that pivotally supports the door body 2. The pivot hinge 3 pivotally supports the door body 2 so that the door body 2 can be opened in both forward and backward directions between a closed position where the door body 2 closes the opening 1 and an open position where the opening 1 is opened. The braking device includes an urging body 10 including a linear damper 7 that is installed on the left and right vertical opening frames 1A of the opening 1 that face the door side surface 2A on the base end side of the door body 2 supported by the pivot hinge 3, and an operating body 8 that is provided on the door side surface 2A of the door body 2 and operates the operated part 20 of the urging body 10. The biasing body 10 includes a cylinder 11 constituting the linear damper 7, a rod 12 provided so as to be able to retract from the cylinder 11, a biasing spring 14 that applies a biasing force to the rod 12 in a direction toward the advanced position, and an operated part 20 that protrudes from the opening vertical frame 1A by receiving the biasing force of the biasing spring 14. The operating body 8 includes an operating surface 22 formed in both the front and rear directions sandwiching the left and right direction. The operating surface 22 is configured so that when the door body 2 is pivotally displaced from the open position in both the front and rear directions toward the closed position, the operating surface 22 comes into contact with the operated part 20, and the rod 12 is pushed into the cylinder 11.

[0010] A rod 12 constituting the linear damper 7 projects from the vertical opening frame 1A by receiving the biasing force of a biasing spring 14, and the tip of the rod 12 projecting from the vertical opening frame 1A serves as an operated portion 20.

[0011] The linear damper 7 is housed in a damper case 16 with the rod 12 protruding to the outside, and the damper case 16 is fixed to the opening vertical frame 1A by fasteners 19.

[0012] When the door body 2 is in the closed position, the extension direction of the rod 12, which is defined by the central axis C of the rod 12, coincides with the left-right direction. When the vertical axis of the pivot hinge 3 is defined as the rotation axis R, the extension direction of the rod 12 is included in a plane that includes the rotation axis R and is aligned along the left-right direction.

[0013] The amount of retraction of the rod 12 into the cylinder 11 caused by contact with the operation surface 22 when the door body 2 is pivotally displaced from the open position to the closed position is configured to gradually increase as the door body approaches the closed position.

[0014] The operation surface 22 and the operated portion 20 are in point contact or line contact.

[0015] The operating body 8 is provided with an engagement portion 25 with which the operated portion 20 engages to hold the door body 2 in the closed position. Effect of the Invention

[0016] As in the present invention, the braking device is provided with a biasing body 10 including a linear damper 7 installed on the door side surface 2A on the base end side of the door body 2 supported by the pivot hinge 3, and an operating body 8 fixed to the left and right opening vertical frames 1A of the opening 1 facing the door side surface 2A and operating the operated part 20 of the biasing body 10, and when the door body 2 is pivotally displaced from the open position in both the front and rear directions to the closed position, the operated part 20 of the biasing body 10 comes into contact with the operating surface 22 of the operating body 8 and the rod 12 is pushed into the cylinder 11. When the door body 2 opened to the front moves toward the closed position, the operated part 20 protruding from the door side surface 2A can be brought into contact with the operating surface 22 formed in the rear direction, and when the door body 2 opened to the rear moves toward the closed position, the operated part 20 protruding from the door side surface 2A can be brought into contact with the operating surface 22 formed in the front direction. As described above, according to the braking device of the present invention, when the door body 2 is opened on both the front and rear sides and moves toward the closed position, the operated part 20 is brought into contact with the operating surface 22, and the self-closing speed of the door body 2 can be braked by the biasing body 10 including the linear damper 7. In addition, since the operated part 20 comes into contact with the operating surface 22 in accordance with the rotational displacement of the self-closing door body 2, there is no need to provide a separate mechanism for executing a braking operation. Therefore, the braking device of the present invention can be suitably applied to a self-closing door in which the door body 2 is supported to be rotatably opened on both the front and rear sides from the closed position.

[0017] Specifically, the rod 12 constituting the linear damper 7 protrudes from the door side surface 2A under the force of the spring 14, and the tip of the rod 12 protruding from the door side surface 2A is made to be the operated part 20. When the door body 2 is rotated and displaced from the open position in both the front and rear directions to the closed position, the tip of the rod 12 comes into contact with the operating surface 22 of the operating body 8 and the rod 12 is pushed into the cylinder 11, thereby braking the self-closing speed of the door body 2.

[0018] When the linear damper 7 is housed in the damper case 16 with the rod 12 protruding to the outside and the damper case 16 is fixed to the door side surface 2A with fasteners 19, the braking device 4 can be configured using a commonly available linear damper 7 that does not have an attachment structure, without having to prepare a dedicated linear damper with an attachment structure, thereby suppressing an increase in the cost of the braking device 4.

[0019] As in the present invention, the braking device is provided with an urging body 10 including a linear damper 7 installed on the left and right opening vertical frames 1A of the opening 1 facing the door side surface 2A on the base end side of the door body 2 supported by the pivot hinge 3, and an operating body 8 provided on the door side surface 2A of the door body 2 for operating an operated part 20 of the urging body 10. When the door body 2 is pivotally displaced from the open position in both the front and rear directions to the closed position, the operated part 20 protruding from the door side surface 2A in the advanced position is subjected to a force in the forward direction and a force in the left and right directions. In the case where the operation surfaces 22 of the operation body 8 formed on both sides of the front and rear direction are in contact with each other and the rod 12 is pushed into the cylinder 11, when the door body 2 opened to the front side moves toward the closed position, the operation surface 22 formed on the rear direction can be brought into contact with the operated part 20 protruding from the vertical opening frame 1A, and when the door body 2 opened to the rear side moves toward the closed position, the operation surface 22 formed on the front direction can be brought into contact with the operated part 20 protruding from the vertical opening frame 1A. As described above, according to the braking device of the present invention, when the door body 2 is opened to both the front and rear sides and moves toward the closed position, the operation surface 22 is brought into contact with the operated part 20, and the self-closing speed of the door body 2 can be braked by the biasing body 10 including the linear damper 7. In addition, since the operation surface 22 comes into contact with the operated part 20 with the rotational displacement of the self-closing door body 2, there is no need to provide a mechanism for performing a braking operation separately. Therefore, the braking device of the present invention can be suitably used for a self-closing door in which the door body 2 is supported so as to be able to rotate openably from the closed position to both the front and rear.

[0020] Specifically, the rod 12 constituting the linear damper 7 protrudes from the opening vertical frame 1A under the force of the spring 14, and the tip of the rod 12 protruding from this opening vertical frame 1A is made into the operated part 20. When the door body 2 is rotated and displaced from the open position in both the front and rear directions toward the closed position, the tip of the rod 12 comes into contact with the operating surface of the operating body 8, and the rod 12 is pushed into the cylinder 11, thereby braking the self-closing speed of the door body 2.

[0021] When the linear damper 7 is housed in the damper case 16 with the rod 12 protruding to the outside and the damper case 16 is fixed to the opening vertical frame 1A with fasteners 19, the braking device 4 can be constructed using a commonly available linear damper 7 that does not have an attachment structure, without having to prepare a dedicated linear damper with an attachment structure, thereby suppressing an increase in the cost of the braking device 4.

[0022] When the door body 2 is in the closed position, the extension direction of the rod 12 defined by the central axis C of the rod 12 coincides with the left-right direction, and when the vertical axis of the pivot hinge 3 is defined as the rotation axis R, the extension direction of the rod 12 is included in a plane along the left-right direction including the rotation axis R. In a plan view, the trajectory of the rod 12 when the door body 2 is rotated from the open position in both the front and rear directions to the closed position can be made linearly symmetrical in front and rear of the plane along the left-right direction including the rotation axis R. According to this, for example, by making the shapes of the operation surfaces 22 formed in both the front and rear directions sandwiching the left-right direction the same, the contact form between the rod 12 and the operation surface 22 when moving from the front open position to the closed position and the contact form between the rod 12 and the operation surface 22 when moving from the rear open position to the closed position can be easily matched. Therefore, the braking performance of the braking device 4 can be set more easily.

[0023] If the amount of retraction of the rod 12 into the cylinder 11 caused by contact with the operation surface 22 when the door body 2 is pivotally displaced from the open position to the closed position is configured to gradually increase as the door body 2 approaches the closed position, the rod 12 can be gradually pushed into the cylinder 11, thereby preventing jerky movement of the door body 2 during braking. Also, if the rod 12 is gradually pushed into the cylinder 11, it is possible to prevent large impacts and loads from acting on the rod 12 and to prevent damage to the linear damper 7.

[0024] When the operation surface 22 and the operated part 20 are configured to be in point contact or line contact, the frictional force between the operation surface 22 and the operated part 20 can be reduced, so that the operation surface 22 and the operated part 20 can slide smoothly, preventing the door body 2 from moving jerkily when braking.

[0025] When the operating body 8 is provided with an engagement portion 25 with which the operated portion 20 engages to hold the door body 2 in the closed position, in addition to holding the door body 2 in the closed position due to the pivot hinge 3, the brake device 4 can also hold the door body 2 in the closed position, so that the door body 2 can be properly held in the closed position. [Brief description of the drawings]

[0026] [Figure 1] FIG. 4 is a cross-sectional plan view showing a main part of the braking device for the self-closing door according to the first embodiment of the present invention, and is a cross-sectional view taken along line AA in FIG. [Diagram 2] FIG. 2 is a front view of a swing door to which the braking device is applied. [Diagram 3] FIG. 2 is a vertical sectional front view of a swing door to which the braking device is applied. [Figure 4] 13A and 13B are diagrams for explaining a braking operation of the door body. [Diagram 5] FIG. 11 is a cross-sectional plan view showing a main part of a braking device for a self-closing door according to a second embodiment of the present invention. [Figure 6] FIG. 2 is a vertical sectional front view of a swing door to which the braking device is applied. [Figure 7] 13A and 13B are diagrams for explaining a braking operation of the door body. [Figure 8] FIG. 11 is a cross-sectional plan view showing a main part of a braking device for a self-closing door according to a third embodiment of the present invention. [Figure 9] FIG. 11 is a cross-sectional plan view showing a main part of a braking device for a self-closing door according to a fourth embodiment of the present invention. [Figure 10] FIG. 13 is a cross-sectional plan view showing a main part of a braking device for a self-closing door according to a fifth embodiment of the present invention. [Figure 11] FIG. 13 is a cross-sectional plan view showing a main part of a braking device for a self-closing door according to a sixth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] (First embodiment) Fig. 1 to Fig. 4 show a first embodiment in which the braking device for a self-closing door according to the present invention is applied to a swing door. In this embodiment, front, rear, left, right, and up and down refer to the crossed arrows shown in the drawings and the indications of front, rear, left, right, and up and down written near each arrow. In Fig. 2, the swing door is provided to close an opening 1 opened in a wall surface, and is composed of a pair of left and right door bodies 2, pivot hinges 3 fixed to the left and right of the opening 1 and supporting each door body 2 so that it can rotate freely, and a braking device 4 that brakes the self-closing speed of each door body 2. The left and right of the opening 1 are divided by vertical opening frames 1A, and the top and bottom are divided by horizontal opening frames 1B and the floor surface.

[0028] As shown in FIG. 2, the pivot hinge 3 is composed of a pair of upper and lower hinge bodies 3A and 3B made of gravity hinges, and supports the upper and lower outer ends of each door body 2. Specifically, the left door body 2 is supported by the pivot hinge 3 at its left side end, and the right door body 2 is supported by the pivot hinge 3 at its right side end. Each door body 2 supported by the pivot hinge 3 is configured so that it can be opened in both the front and back directions between a closed position where the opening 1 is closed and an open position where the opening 1 is opened. As shown in FIG. 1 and FIG. 3, the rotation axis R of the pivot hinge 3, which is a vertical axis, is disposed inside the left and right width of the door body 2 and at the center position in the thickness direction, and each door body 2 is supported by the upper and lower hinge bodies 3A and 3B so as to be rotatable in the front and back directions on the front side (near side) and rear side (rear side) around the rotation axis R. The door body 2 in the normal state is held in the closed position where the opening 1 is closed by the self-closing action resulting from the gravity hinge structure. When the door body 2 is rotated from the closed position to the front or rear and displaced to the open position, it automatically rotates (self-closes) to the closed position side by its own weight and the action of the gravity hinge and returns to the closed position when the rotation operation is released.

[0029] For example, in a swing door not provided with the brake device 4, when the door body 2 is opened backward and then the rotation operation is released, the door body 2 rotates forward of the closed position with the momentum of the self-closing speed, and if the momentum remains, it rotates again to the rear side of the closed position. While repeating this, the self-closing speed of the door body 2 is gradually attenuated by the internal friction of the pivot hinge 3, and finally the door body 2 stops at the closed position. The brake device 4 is provided to converge such reciprocating rotation early and shorten the time required for the door body 2 to stop at the closed position. In this embodiment, the left and right door bodies 2·2 have a structure opposite to each other, so only the left door body 2 will be described below, and the description of the right door body 2 will be omitted.

[0030] 3, the braking devices 4 are provided above and below the door body 2 to brake the self-closing speed of the door body 2 resulting from the pivot hinge 3, and include an urging body 10 including a linear damper 7 installed on the door body 2, and an operating body 8 fixed to the opening 1. The urging body 10 is provided on the left door side surface 2A where the rotation axis R is located, and the operating body 8 is provided on the left opening vertical frame 1A facing the door side surface 2A.

[0031] As shown in Fig. 1, the linear damper 7 includes a hollow cylindrical cylinder 11 fixed to the door body 2, a rod 12 provided so as to be freely retractable relative to the cylinder 11, a damping structure 13 provided between the cylinder 11 and the rod 12 for applying a damping force to the rod 12, and a biasing spring 14 for applying a biasing force to the rod 12 toward the advanced position. The rod 12 is made of a round shaft having a smaller diameter than the cylinder 11, and one end protrudes from the cylinder 11. The other end located inside the cylinder 11 is provided with a piston 15 having an outer diameter substantially the same as the inner diameter of the cylinder 11 and sliding within the cylinder 11. The biasing spring 14 is made of a compression coil spring and is disposed between the bottom wall of the cylinder 11 and the piston 15.

[0032] The linear damper 7 of this embodiment is configured as a commonly available known oil damper equipped with a damping structure 13. Specifically, the damping structure 13 of the linear damper 7 is configured as a damping mechanism (not shown) and a biasing spring 14. The damping mechanism 13 is configured as a fluid passage equipped with a viscous fluid filled in an internal space partitioned by a cylinder 11 and a piston 15, and an orifice provided in the piston 15. In a normal state, the rod 12 is located at an advanced position where the piston 15 is pressed against one end of the cylinder 11 by the biasing force of the biasing spring 14 and advanced to its limit, and when the rod 12 is pressed into the cylinder 11, a resistance force is applied to the retraction movement of the rod 12 by the damping structure 13. The tip of the rod 12 protruding from the cylinder 11 is formed in a hemispherical shape, and this tip is configured as an operated part 20 operated by an operating body 8.

[0033] The linear damper 7 is housed in a damper case 16 with the rod 12 protruding to the outside. The damper case 16 is composed of a hollow cylindrical case body 17 containing the cylinder 11 and a flange portion 18 formed by protruding from one end (left end) of the case body 17, and the rod 12 protrudes from the end of the cylinder 11 on the flange portion 18 side. The damper case 16 is formed by joining two half bodies of the same shape divided into front and rear. The damper case 16 housing the linear damper 7 is fixed to the door body 2 by inserting the case body 17 into a mounting hole 2B recessed and formed in the door side surface 2A, and fastening the flange portion 18 to the door side surface 2A with a screw (fastener) 19. The linear damper 7 is installed relative to the door body 2 so that when the door body 2 is in the closed position, the extension direction of the rod 12 defined by the central axis C of the rod 12 coincides with the left-right direction (horizontal direction), and further, the extension direction of the rod 12 is included in a plane including the rotation axis R and along the left-right direction. A linear damper 7 installed on the door body 2 has a rod 12 protruding from the door side surface 2A.

[0034] As shown in FIG. 1, the operating body 8 is formed in a rectangular block shape that is flat on the left and right sides, and the right side of the operating body 8 has operating surfaces 22 formed in both the front and rear directions on both sides of the left and right direction. Specifically, the entire front and rear operating surfaces 22 are formed as a curved surface in an arc shape that is recessed to the left in a plan view, and the front and rear operating surfaces 22 are formed in line symmetry with a straight line (the central axis C of the rod 12) that extends in the left and right directions and passes through the rotation axis R. Screw holes 23 that penetrate the operating body 8 in the left and right directions are formed in the four corners of the right side of the operating body 8, and the operating body 8 is fastened to the opening 1 with screws 24 that are screwed into the opening vertical frame 1A through the screw holes 23. The central axis C of the rod 12 of the linear damper 7 and the center in the up-down direction of the operating body 8 are arranged at the same height (see FIG. 3).

[0035] When the door body 2 is pivotally displaced from the open position in both the front and rear directions to the closed position, the rod 12 in the advanced position comes into contact with the operation surface 22, and the rod 12 is pushed into the cylinder 11. In Figs. 1 and 4, when the rotation trajectory of the tip (operated part 20) of the rod 12 displaced to the advanced position by the biasing spring 14 is defined as the rod rotation trajectory T, the operation body 8 is provided so as to overlap with the rod rotation trajectory T in a region where the rod 12 is displaced when the door body 2 opened in the front and rear directions rotates from a predetermined angle before the closed position to the closed position. In this embodiment, the operation body 8 overlaps inside the rod rotation trajectory T in a range where the door body 2 is pivotally displaced by about 30 degrees in the front and rear directions with the closed position of the door body 2 in between, and the operation surface 22 is present on the right side of the operation body 8 overlapping the rod rotation trajectory T. When the door body 2 is pivotally displaced from the open position to the closed position, the amount of retraction of the rod 12 into the cylinder 11 accompanying contact with the operating surface 22 gradually increases toward the closed position. At this time, since the tip of the rod 12 is formed in a hemispherical shape, the rod 12 (operated part 20) and the operating surface 22 come into contact in a point-like manner.

[0036] It is desirable that the operation surface 22 overlaps with the rod rotation trajectory T when the door body 2 is rotated and displaced in the front and rear directions within a range of 20 degrees or more and 35 degrees or less with the closed position of the door body 2 in between. This is because if the range of the operation body 8 overlapping with the rod rotation trajectory T is less than 20 degrees from the closed position, the rotation angle required for braking is insufficient and the self-closing speed of the door body 2 cannot be sufficiently braked. Also, if the range of the operation body 8 overlapping with the rod rotation trajectory T is more than 35 degrees from the closed position, the rotation angle at which the door body 2 is braked is large and the time required for the door body 2 to reach the closed position becomes longer.

[0037] An engagement groove (engagement portion) 25 extending in the vertical direction is formed as a recess at the boundary between the front and rear operation surfaces 22, and the tip of the rod 12 engages with this engagement groove 25 when the door body 2 is in the closed position. When the door body 2 rotates to the closed position, the rod 12, which comes into contact with the operation surface 22, advances, thereby engaging the rod 12 with the engagement groove 25. The door body 2 in the closed position is held in place by the self-closing action of the pivot hinge 3 as well as by the engagement of the rod 12 with the engagement groove 25.

[0038] The door body 2 in the closed position shown in FIG. 1 is held by the self-closing action of the pivot hinge 3 and the engagement of the rod 12 with the engagement groove 25. When opening the door body 2 from this state to the rear (back side), for example, the user pushes the door body 2 toward the back side by hand against the holding force of the door body 2 by the pivot hinge 3 and the engagement of the rod 12 with the engagement groove 25. By pushing the door body 2 as described above, the rod 12 is pressed against the groove edge of the engagement groove 25, and the rod 12 moves back due to the pressing reaction force, and the rod 12 is separated from the engagement groove 25 as the door body 2 rotates. At this time, by pushing the door body 2 closer to the rotation tip, the distance from the rotation axis R of the door body 2 to the operation position can be made sufficiently larger than the distance from the rotation axis R of the door body 2 to the tip of the rod 12, and the rod 12 can be separated from the engagement groove 25 even with a relatively light operating force, and the door body 2 can be opened. After the engagement between the rod 12 and the engagement groove 25 is released, the door body 2 can be opened by continuing to press the door body 2 against the self-closing action of the pivot hinge 3. As the door body 2 is opened, the rod 12 moves in the advancing direction due to the biasing force of the biasing spring 14, and is displaced to the advanced position when it is not in contact with the operation surface 22.

[0039] Next, the braking operation of the door body 2 by the braking device 4 will be described with reference to FIG. 4. When the user releases the hand that opened the door body 2, the door body 2 rotates forward (toward the viewer) in the closing direction due to the self-closing action of the pivot hinge 3. Just before the self-closing door body 2 reaches the closed position, the tip of the rod 12 of the linear damper 7 comes into contact with the operation surface 22 on the front side of the operation body 8, as shown in FIG. 4(a). As described above, the amount of retraction of the rod 12 into the cylinder 11 due to contact with the operation surface 22 is configured to gradually increase as it approaches the closed position. Therefore, the rod 12 that comes into contact with the operation surface 22 is gradually pushed in while sliding on the operation surface 22 as the door body 2 rotates, as shown in FIG. 4(b), and the self-closing speed of the door body 2 is braked by the resistance of the rod 12 when it retracts.

[0040] When the self-closing speed of the door body 2 is sufficiently slowed down by one braking, the rod 12 engages with the engagement groove 25 at the closed position, and the door body 2 is held in the closed position. When the self-closing speed of the door body 2 is not sufficiently slowed down by one braking, the door body 2 rotates forward from the closed position, and is automatically closed backward again in the closing direction by the self-closing action of the pivot hinge 3, and then the self-closing speed of the door body 2 is slowed down by the same operation as above, and finally the rod 12 engages with the engagement groove 25 at the closed position, and the door body 2 is held in the closed position.

[0041] As described above, in the braking device 4 of this embodiment, when the door body 2 is opened to both the front and rear sides and moves toward the closed position, the rod 12 is brought into contact with the operation surface 22, and the self-closing speed of the door body 2 can be braked by the linear damper 7. In addition, since the rod 12 comes into contact with the operation surface 22 in accordance with the rotational displacement of the self-closing door body 2, there is no need to provide a separate mechanism for executing a braking operation. Therefore, the braking device 4 of this embodiment can be suitably applied to a self-closing door in which the door body 2 is supported to be rotatably opened to both the front and rear sides from the closed position.

[0042] Since the damper case 16 housing the linear damper 7 with the rod 12 protruding to the outside is fixed to the door side surface 2A with the screws 19, the braking device 4 can be configured using a commonly available linear damper 7 without a mounting structure, thereby suppressing an increase in the cost of the braking device 4, without the need to prepare a dedicated linear damper with a mounting structure.

[0043] When the door body 2 is in the closed position, the extension direction of the rod 12 defined by the central axis C of the rod 12 coincides with the left-right direction, and when the vertical axis of the pivot hinge 3 is defined as the rotation axis R, the extension direction of the rod 12 is included in a plane along the left-right direction including the rotation axis R. Therefore, in a plan view, the trajectory of the rod 12 when the door body 2 is rotated from the open position in both the front and rear directions to the closed position can be reversed in front and rear of the plane along the left-right direction including the rotation axis R. According to this, by making the shapes of the operation surfaces 22 formed in both the front and rear directions sandwiching the left-right direction the same, it is possible to easily match the contact form between the rod 12 and the operation surface 22 when moving from the front open position to the closed position and the contact form between the rod 12 and the operation surface 22 when moving from the rear open position to the closed position. Therefore, the braking performance of the braking device 4 can be set more easily.

[0044] Since the amount of retraction of the rod 12 into the cylinder 11 caused by contact with the operating surface 22 when the door body 2 is pivotally displaced from the open position to the closed position is configured to gradually increase as the door body 2 approaches the closed position, the rod 12 can be gradually pushed into the cylinder 11, preventing jerky movement of the door body 2 during braking. Also, when the rod 12 is gradually pushed into the cylinder 11 in this manner, it is possible to prevent large impacts and loads from acting on the rod 12, and to prevent damage to the linear damper 7.

[0045] The operation surface 22 and the rod 12 are configured to be in point contact or line contact, so that the frictional force between the operation surface 22 and the rod 12 is reduced, allowing the operation surface 22 and the rod 12 to slide smoothly, preventing the door body 2 from moving jerkily when braking.

[0046] Since the operating body 8 is provided with an engagement groove 25 for holding the door body 2 in the closed position, in addition to holding the door body 2 in the closed position due to the pivot hinge 3, the braking device 4 also holds the door body 2 in the closed position, so that the door body 2 can be properly held in the closed position.

[0047] 5 to 7 show a second embodiment in which the braking device for a self-closing door according to the present invention is applied to a swing door. This embodiment differs from the first embodiment in that the linear damper 7 constituting the biasing body 10 of the braking device 4 is installed in the opening 1, and the operating body 8 is fixed to the door body 2.

[0048] 5 and 6, the damper case 16 housing the linear damper 7 is fixed to the opening 1 by inserting the case body 17 into a mounting hole 1C recessed in the vertical opening frame 1A and fastening the flange portion 18 to the vertical opening frame 1A with screws (fasteners) 19. The linear damper 7 is installed relative to the vertical opening frame 1A such that when the door body 2 is in the closed position, the extension direction of the rod 12 defined by the central axis C of the rod 12 coincides with the left-right direction (horizontal direction) and further the extension direction of the rod 12 is included in a plane along the left-right direction including the rotation axis R. The linear damper 7 installed in the opening 1 has its rod 12 protruding from the vertical opening frame 1A.

[0049] As shown in FIG. 5, the operating body 8 is formed in a bow shape having an arc part on the left side, and the left side surface of the operating body 8 has operating surfaces 22 in both the front and rear directions sandwiching the left and right directions. Specifically, the entire front and rear operating surfaces 22 are formed as an arc-shaped curved surface bulging to the left in a plan view, and the front and rear operating surfaces 22 are formed in line symmetry with a straight line (the central axis C of the rod 12) extending in the left and right directions passing through the rotation axis R. Screw holes 23 penetrating the operating body 8 in the left and right directions are formed in the four corners of the left side surface of the operating body 8, and the operating body 8 is fastened to the door body 2 with screws 24 screwed into the door side surface 2A through the screw holes 23, and fixed to the door body 2. The central axis C of the rod 12 of the linear damper 7 and the center in the up and down direction of the operating body 8 are arranged at the same height (see FIG. 3).

[0050] When the door body 2 is pivotally displaced from the open position in both the front and rear directions to the closed position, the rod 12 in the advanced position comes into contact with the operation surface 22, and the rod 12 is pushed into the cylinder 11. As shown in FIG. 7, when the area surrounded by the outer edge of the rod 12 in the advanced position in a plan view is defined as the rod projection area P, the operation body 8 is provided so as to overlap with the rod projection area P in the area where the rod 12 displaces when the door body 2 opened in the front and rear directions pivots from a predetermined angle before the closed position to the closed position. In this embodiment, the operation body 8 overlaps inside the rod projection area P in the range where the door body 2 pivots and displaces by about 25 degrees in the front and rear directions with the closed position of the door body 2 in between, and the operation surface 22 is present on the left side of the operation body 8 overlapping with the rod projection area P. The retraction amount of the rod 12 into the cylinder 11 due to contact with the operation surface 22 when the door body 2 pivots and displaces from the open position to the closed position is configured to gradually increase as it approaches the closed position. Other points are the same as those in the first embodiment, so the same configurations, structures, and members are given the same reference numerals and the description thereof is omitted.

[0051] It is desirable that the operating body 8 overlaps the rod projection area P when the door body 2 rotates and displaces in the range of 20 degrees or more and 35 degrees or less in the forward and backward directions with the closed position of the door body 2 in between. This is because if the range of the operating body 8 overlapping the rod projection area P is less than 20 degrees from the closed position, the rotation angle required for braking is insufficient and the self-closing speed of the door body 2 cannot be sufficiently braked. Also, if the range of the operating body 8 overlapping the rod projection area P is more than 35 degrees from the closed position, the rotation angle at which the door body 2 is braked is large and the time required for the door body 2 to reach the closed position becomes longer.

[0052] The operation of opening the door body 2 in the closed position (see FIG. 5) is the same as that of the first embodiment. When the user releases the hand that opened the door body 2, the door body 2 rotates forward (toward the user) in the closing direction due to the self-closing action of the pivot hinge 3. As shown in FIG. 7(a), the operating surface 22 on the rear side of the operating body 8 comes into contact with the tip of the rod 12 of the linear damper 7 just before the self-closing door body 2 reaches the closed position. As described above, the retraction amount of the rod 12 into the cylinder 11 due to contact with the operating surface 22 is configured to gradually increase as the door body 2 approaches the closed position. Therefore, the operating surface 22 in contact with the rod 12 gradually pushes in the tip of the rod 12 while sliding it with the rotation of the door body 2 as shown in FIG. 7(b), and the self-closing speed of the door body 2 is braked by the resistance at the time of retraction of the rod 12.

[0053] As described above, in the braking device 4 of this embodiment, when the door body 2 is opened to both the front and rear sides and moves toward the closed position, the rod 12 is brought into contact with the operation surface 22, and the self-closing speed of the door body 2 can be braked by the linear damper 7. In addition, since the rod 12 comes into contact with the operation surface 22 in accordance with the rotational displacement of the self-closing door body 2, there is no need to provide a separate mechanism for executing a braking operation. Therefore, the braking device 4 of this embodiment can be suitably applied to a self-closing door in which the door body 2 is supported to be rotatably opened to both the front and rear sides from the closed position.

[0054] Since the damper case 16 housing the linear damper 7 with the rod 12 protruding to the outside is fixed to the opening vertical frame 1A with screws 19, the braking device 4 can be configured using a commonly available linear damper 7 without a mounting structure, thereby suppressing an increase in the cost of the braking device 4, without the need to prepare a dedicated linear damper with a mounting structure.

[0055] (Third embodiment) Fig. 8 shows a third embodiment of the brake device for a self-closing door according to the present invention. In the brake device 4 of the third embodiment, the configuration of the biasing body 10 fixed to the door body 2 is different from that of the first embodiment. Specifically, in the first embodiment, the rod 12 constituting the linear damper 7 is biased by the biasing force of the biasing spring 14 and protrudes from the door side surface 2A, and the tip of the rod 12 protruding from the door side surface 2A is the operated part 20. In contrast, in the third embodiment, the cylinder 11 constituting the linear damper 7 is biased by the biasing force of the biasing spring 14 and protrudes from the door side surface 2A, and the tip of the cylinder 11 protruding from the door side surface 2A is the operated part 20. The tip of the cylinder 11 is formed in a hemispherical shape.

[0056] (Fourth embodiment) FIG. 9 shows a fourth embodiment of the brake device for a self-closing door according to the present invention. In the brake device 4 of the fourth embodiment, the configuration of the biasing body 10 fixed to the door body 2 is different from that of the previous third embodiment. Specifically, in the previous third embodiment, the tip of the cylinder 11 constituting the linear damper 7 protrudes from the door side surface 2A to form the operated part 20, whereas in this fourth embodiment, a pressing piece 30 pressed by the linear damper 7 is provided at the tip of the biasing body 10, and the tip of the pressing piece 30 protrudes from the door side surface 2A to form the operated part 20. Specifically, the biasing body 10 is composed of a damper case 16 composed of a hollow cylindrical case main body 17 and a flange part 18 formed by projecting from one end (left end) of the case main body 17, and the linear damper 7 and pressing piece 30 housed in the case main body 17. The pressing piece 30 is disposed on one end (left end) side of the case body 17 so as to be slidable in the left-right direction, and its tip protrudes from one end (left end) of the damper case 16 and also protrudes from the door side surface 2A. The tip of this pressing piece 30 is the operated part 20 that is operated by the operating body 8.

[0057] (Fifth embodiment) Fig. 10 shows a fifth embodiment of the brake device for a self-closing door according to the present invention. In the brake device 4 of the fifth embodiment, the configuration of the biasing body 10 fixed to the vertical opening frame 1A is different from that of the second embodiment. Specifically, in the second embodiment, the rod 12 constituting the linear damper 7 is biased by the biasing spring 14 and protrudes from the vertical opening frame 1A, and the tip of the rod 12 protruding from the vertical opening frame 1A is the operated part 20. In contrast, in the fifth embodiment, the cylinder 11 constituting the linear damper 7 is biased by the biasing spring 14 and protrudes from the vertical opening frame 1A, and the tip of the cylinder 11 protruding from the vertical opening frame 1A is the operated part 20. The tip of the cylinder 11 is formed in a hemispherical shape.

[0058] (Sixth embodiment) FIG. 11 shows a sixth embodiment of the braking device for a self-closing door according to the present invention. In the braking device 4 of the sixth embodiment, the configuration of the biasing body 10 fixed to the vertical opening frame 1A is different from that of the fifth embodiment. Specifically, in the fifth embodiment, the tip of the cylinder 11 constituting the linear damper 7 protrudes from the vertical opening frame 1A to form the operated part 20, whereas in the sixth embodiment, a pressing piece 30 pressed by the linear damper 7 is provided at the tip of the biasing body 10, and the tip of the pressing piece 30 protrudes from the vertical opening frame 1A to form the operated part 20. Specifically, the biasing body 10 is composed of a damper case 16 composed of a hollow cylindrical case main body 17 and a flange part 18 formed by projecting from one end (right end) of the case main body 17, and the linear damper 7 and pressing piece 30 housed in the case main body 17. The pressing piece 30 is disposed on one end (right end) side of the case body 17 so as to be slidable in the left-right direction, and its tip protrudes from one end (right end) of the damper case 16 and also protrudes from the opening vertical frame 1A. The tip of this pressing piece 30 is the operated part 20 that is operated by the operating body 8.

[0059] In the above embodiment, two braking devices 4 are provided on the door body 2, but the number of braking devices 4 can be appropriately changed depending on the weight of the door body 2 and the braking force of the linear damper 7. The operation surfaces 22 formed in both the forward and rearward directions on both sides of the left and right direction can be formed in different shapes instead of being line-symmetrical. In this case, the braking action (braking force or braking distance) when moving from the front open position to the closed position can be different from the braking action when moving from the rear open position to the closed position. The damping structure 13 of the linear damper 7 uses a viscous fluid, but may be a damping structure using gas or other known damping structure. The resistance force of the damping structure 13 may be variable depending on the position of the rod 12, in addition to being constant. The rod 12 may be provided with a roller rotatable around a vertical axis at the tip, and the roller may be brought into contact with the operation surface 22 as the operated part 20. In this case, if the roller is formed in a cylindrical shape, the roller (operated part 20) and the operating surface 22 come into line contact, and if the roller is formed in an abacus bead shape, the roller (operated part 20) and the operating surface 22 come into point contact. [Explanation of symbols]

[0060] 1 Opening 1A Opening vertical frame 2 Door body 2A Door side 3 Pivot Hinge 7 Linear Damper 8 Control unit 10. Forced body 11 Cylinders 12 Rod 14 Spring 16 Damper case 20 Operated part 22 Operation surface 25 Engagement part C Rod center axis R Pivot hinge rotation axis

Claims

1. A braking device applied to a self-closing door having a door body (2) that closes an opening (1) and a self-closing pivot hinge (3) that supports the door body (2) in a rotatable manner, The pivot hinge (3) supports the door body (2) to rotate between a closed position where the door body (2) closes the opening portion (1) and an open position where the door body (2) opens the opening portion (1) so that the door body (2) can be opened in both forward and backward directions; The braking device includes an urging body (10) including a linear damper (7) installed on a door side surface (2A) on the base end side of a door body (2) supported by a pivot hinge (3), and an operating body (8) fixed to left and right vertical opening frames (1A) of an opening (1) facing the door side surface (2A) and operating an operated portion (20) of the urging body (10); The biasing body (10) includes a cylinder (11) constituting the linear damper (7), a rod (12) provided so as to be capable of moving forward and backward relative to the cylinder (11), a biasing spring (14) that applies a biasing force to the rod (12) in a direction toward the advanced position, and an operated portion (20) that receives the biasing force of the biasing spring (14) and protrudes from the door side surface (2A); The operation body (8) has an operation surface (22) formed in both the front and rear directions across the left and right direction, The brake device for a self-closing door is configured so that when a door body (2) is pivotally displaced from an open position in both the front and rear directions to a closed position, an operated part (20) comes into contact with an operating surface (22) and a rod (12) is pushed into a cylinder (11).

2. A brake device for an automatic closing door as described in claim 1, wherein a rod (12) constituting the linear damper (7) protrudes from a door side surface (2A) by receiving a biasing force of a biasing spring (14), and a tip of the rod (12) protruding from the door side surface (2A) is made to be an operated part (20).

3. The linear damper (7) is housed in a damper case (16) with the rod (12) protruding to the outside, 3. The braking device for a self-closing door according to claim 2, wherein the damper case (16) is fixed to the door side surface (2A) by a fastener (19).

4. A braking device applied to a self-closing door having a door body (2) that closes an opening (1) and a self-closing pivot hinge (3) that supports the door body (2) in a rotatable manner, The pivot hinge (3) supports the door body (2) to rotate between a closed position where the door body (2) closes the opening portion (1) and an open position where the door body (2) opens the opening portion (1) so that the door body (2) can be opened in both forward and backward directions; The braking device includes an urging body (10) including a linear damper (7) installed on the left and right opening vertical frames (1A) of the opening (1) facing the door side surface (2A) on the base end side of the door body (2) supported by the pivot hinge (3), and an operating body (8) provided on the door side surface (2A) of the door body (2) for operating an operated portion (20) of the urging body (10); The biasing body (10) includes a cylinder (11) constituting the linear damper (7), a rod (12) provided so as to be capable of moving forward and backward relative to the cylinder (11), a biasing spring (14) that applies a biasing force to the rod (12) in a direction toward the advanced position, and an operated portion (20) that receives the biasing force of the biasing spring (14) and protrudes from the opening vertical frame (1A), The operation body (8) has an operation surface (22) formed in both the front and rear directions across the left and right direction, The braking device for a self-closing door is characterized in that when a door body (2) is pivotally displaced from an open position in both the front and rear directions to a closed position, an operating surface (22) comes into contact with an operated portion (20) and a rod (12) is pushed into a cylinder (11).

5. A brake device for an automatic closing door as described in claim 4, wherein a rod (12) constituting the linear damper (7) protrudes from the opening vertical frame (1A) under the force of a spring (14), and a tip of the rod (12) protruding from the opening vertical frame (1A) is made to be an operated part (20).

6. The linear damper (7) is housed in a damper case (16) with the rod (12) protruding to the outside, 6. The braking device for a self-closing door according to claim 5, wherein the damper case (16) is fixed to the opening vertical frame (1A) by a fastener (19).

7. When the door body (2) is in the closed position, the extension direction of the rod (12) defined by the central axis (C) of the rod (12) coincides with the left-right direction, When the vertical axis of the pivot hinge (3) is defined as the rotation axis (R), 5. The brake device for a self-closing door according to claim 1 or 4, wherein the extension direction of the rod (12) is included within a plane that includes the pivot axis (R) and extends along the left-right direction.

8. 5. A braking device for a self-closing door as described in claim 1 or 4, wherein the amount of retraction of the rod (12) into the cylinder (11) caused by contact with the operating surface (22) when the door body (2) is pivotally displaced from the open position to the closed position is gradually increased as the door body approaches the closed position.

9. 5. The braking device for a self-closing door according to claim 1 or 4, wherein the operating surface (22) and the operated portion (20) are in point contact or line contact with each other.

10. 5. The braking device for a self-closing door according to claim 1, wherein the operating body (8) is provided with an engaging portion (25) that engages with the operated portion (20) to hold the door body (2) in the closed position.

Images