JP2013100656A - Door hinge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a door hinge which is configured to prevent excessive stress concentration from occurring in a hook part of a coil spring.SOLUTION: A door hinge comprises a first cylindrical body, second cylindrical bodies which are disposed in the first cylindrical body while being aligned in an axial line direction and in a rotatable manner, a shaft a first terminal portion of which is fixed inside the first cylindrical body and a second terminal portion of which is supported in a rotatable manner within the second cylindrical body by a bearing member, a first coil spring which is set within the first cylindrical body and around the shaft, and a second coil spring which is set within the second cylindrical body. The first coil spring includes first and second hook parts disposed around a first collar a winding part of which is disposed partially in the first terminal portion of the shaft in one end, disposed around a second collar a winding part of which is disposed partially in the second terminal portion of the shaft in the other end, and extending from distal ends of the respective terminal portions to the inside in a radial direction. The first and second hook parts are locked to the first and second collars, respectively.

Description

  The present invention relates to a door hinge that applies a rotational biasing force to a door by an elastic force of a built-in coil spring.

  This type of door hinge is normally rotatable relative to a cylindrical body, a coil spring coaxially set in the cylindrical body, and coaxial with the cylindrical body so as to close one end of the cylindrical body. A door closer having attached end wall members. One end of the coil spring is attached to the cylinder, the other end is attached to the end wall member, and the end wall member and the cylinder rotate relative to each other as the door opens. A coil spring is twisted to generate a closing force (Patent Documents 1, 2, and 3).

  The applicant has two cylinders that are coaxial and overlap each other so as to be relatively rotatable, set coil springs in both cylinders, one cylinder on the door frame side, and the other cylinder The body is fixed on the door side, and when the door is opened, relative rotation occurs between these two cylinders, so that the elastic force for closing the door is supported by the two coil springs. Manufactures door hinges. In this door hinge, by using two coil springs, the diameter of each coil spring can be reduced, and the outer diameter of the door hinge can be reduced. Further, in this door hinge, in order to transmit the rotation of the cylinder fixed to the door side to the coil spring in the cylinder fixed to the door frame side, the cylinder extends from the free end of the cylinder fixed to the door side. A shaft connected to the end of the coil spring in the cylinder on the door frame side is provided beyond the connecting portion with the cylinder fixed to the door frame side. Therefore, the coil spring in the cylinder fixed to the door side is set in a limited cylindrical space between the inner peripheral surface of the cylinder and the outer peripheral surface of the shaft. On the other hand, it is necessary to make it possible to generate the required elastic force even if it is small. For this reason, this coil spring is not made of a spring material having a generally used cross section, but is made of a spring material having a square cross section capable of generating a large elastic force even in a small size.

JP-A-9-151664 Shoko 58-17108 JP-A-9-158605

  The door hinge is usually required to have durability that enables opening and closing operations of 100,000 times or more. In practice, the door hinge is formed by bending the end of the coil spring with a lower number of opening and closing operations. The hook part) may break. In the door hinge disclosed in the above-mentioned patent document, a coil spring using a spring material having a circular cross section is used, and both ends thereof are bent outward in the axial direction of the coil spring and connected to a required part. However, the bent portion often breaks. This is because the axial length of the coil spring changes due to the winding and unwinding of the coil spring, so that the hook portion must be lengthened to some extent, and a large bending moment is applied to the bent portion. It is considered that the bending stress applied from the hook portion extending in the direction to the bent portion is applied in a combined direction of the axial direction and the circumferential direction of the coil spring.

  In the door hinge provided with the above-mentioned two cylinders and two coil springs, the present invention sufficiently enables opening and closing operations of 500,000 times or more without causing excessive stress concentration in the hook portions of the coil springs. An object is to provide such a door hinge.

That is, the present invention includes a first cylinder having a first free end at one end, a first connection end at the other end, and a first blade attached to one of the door and the door frame on the outer surface;
A second cylinder having a second free end at one end, a second connection end at the other end, and a second blade attached to the other of the door and the door frame on the outer surface, wherein the second connection A second cylinder that is adjacent to the first connection end and is aligned with the first cylinder in the longitudinal axis direction and is connected to the first cylinder so as to be relatively rotatable. Body,
A bearing member fixed to the second connecting end of the second cylinder;
From the first end, a first end fixed to the first free end of the first cylinder, a second end adjacent to the second connection end in the second cylinder, and the first end A shaft body that extends concentrically in the first cylindrical body, passes through the bearing member and reaches the second connection end, and is rotatably supported by the bearing member;
A first coil spring having a plurality of winding portions and having substantially the same diameter over the entire length and provided concentrically around the shaft body in the first cylinder, the first end portion of the shaft A first coil spring having a first end coupled to the bearing member and a second end coupled to the bearing member;
A second coil spring having a plurality of winding portions and having substantially the same diameter over the entire length and provided concentrically in the second cylinder, the first coil spring being connected to the second end of the shaft A second coil spring having an end and a second end coupled to the second free end of the second cylinder;
With
When the first and second cylinders are relatively rotated by the opening operation, the first and second coil springs are wound and the closing force is fed.
The shaft has a first collar whose diameter is larger than that of the shaft body at a position adjacent to the first free end.
The bearing member has a second collar disposed around the shaft body at a position adjacent to the first connecting end in the first cylinder.
The first coil spring is disposed at the first end of the first coil spring, with a portion of the winding portion being disposed in the vicinity of the first collar, and having a radius from the tip of the first end. A first hook portion that is bent inward in the direction, and the first hook portion is locked to the first collar, and the winding is provided at the second end of the first coil spring. A portion of the portion is disposed in the vicinity of the second collar, and has a second hook portion formed by being bent radially inward from the tip of the second end portion, the second hook portion being A door hinge is provided which is locked to the second collar.

  In this door hinge, since the first and second hook portions formed at both ends of the first coil spring extend inward in the radial direction of the first coil spring, the first coil spring is accompanied by the closing operation. The direction of the load applied to the hook portions at both ends of the first coil spring when it is tightened is a direction in a plane substantially perpendicular to the longitudinal axis direction of the first coil spring (the tangential direction of the collar). In addition, the first coil spring is disposed at both ends thereof, and a part of the winding part is arranged in the vicinity of the first collar and the second collar (that is, the winding part is the first collar and the second collar). Therefore, the tightening torque applied from both ends to the first coil spring is applied in a state where both ends of the first coil spring are stable around the central axis. For these reasons, the first coil spring can be tightened in a generally stable state, and the first coil spring is prevented from being deformed such that its longitudinal central axis is curved, and accordingly, It is possible to suppress engagement with the inner peripheral surface of the first cylinder and the outer peripheral surface of the shaft provided concentrically in the first cylinder. Further, in this door hinge, both end portions of the first coil spring are arranged so as to be wound around the first and second collars having a diameter larger than that of the shaft main body, and thus the distance from the shaft main body is increased. ing. For this reason, it can suppress significantly that a 1st coil spring engages with the outer peripheral surface of a shaft. The present inventor noticed the following in developing the door hinge of the present invention. That is, when the door hinge made of the conventional first and second cylinders described above is disassembled and examined when the first coil spring is broken, it passes through the inner peripheral surface of the first cylinder and the first cylinder. This means that large scratches are left on the outer peripheral surface of the shaft. This is because, when the first coil spring is tightened with the opening operation, the first coil spring is deformed such that its longitudinal center axis is curved or meandered. This is considered to be due to the strong frictional engagement with the inner peripheral surface and the outer peripheral surface of the shaft passing through the first cylinder. If such frictional engagement occurs in the central part of the coil spring, for example, the coil spring is tightened only in half of the length in an extreme case. The hook portion at the end is subjected to extremely excessive bending stress as compared with the case where the entire hook portion is wound. In the door hinge according to the present invention, when the first coil spring is tightened as the door is opened, the engagement with the inner peripheral surface of the first cylinder and the outer peripheral surface of the shaft can be suppressed as described above. Therefore, excessive bending stress to the hook portion, which would have occurred in the conventional door hinge, can be avoided.

  More specifically, the first and second coil springs may be made of a spring material having a circular cross section.

  To make a coil spring having an elastic force equivalent to that of a coil spring made of a spring material having a square cross section as described in the background art (see the bottom row of paragraph 0003) using a spring material having a circular cross section Although it is necessary to use a spring material having a relatively large diameter, in the door hinge of the present invention, as described above, the coil spring can be prevented from curving or meandering at the longitudinal center axis of the coil spring during winding. And the inner peripheral surface of the first cylindrical body can be set small, so even if the diameter of the coil spring is increased by using a large-diameter spring material, Contact can be made difficult to occur. Accordingly, in order to obtain the necessary elastic force, a coil spring of a circular spring material that has a relatively large diameter but is easy to manufacture can be used. The manufacturing cost can be kept low compared with the case of using it.

  More specifically, the first collar may be a cylindrical member formed separately from the shaft main body, and may be fixed to the shaft main body.

  More specifically, the first collar is a cylindrical member having a recess extending in the longitudinal direction, and the first hook portion of the first coil spring is engaged with the recess. Can be.

  Since the first hook portion of the first coil spring is engaged with the recess extending in the longitudinal axis direction, the first hook portion is expanded and contracted in the axial direction by being wound and unwound. Can be displaced in the longitudinal direction in the recess. Thereby, the first coil spring is easily wound and unwound, and an excessive load on the hook portion can be suppressed.

  More specifically, the first collar is a cylindrical member having a slit extending in the longitudinal direction, and at least a part of the slit is bent inward in the radial direction. And the first end of the shaft is provided with a first longitudinal groove, the locking bent portion engages with the first longitudinal groove, and the first collar rotates in the circumferential direction. It can be fixed so that it does not.

  With this configuration, the first collar can be easily fixed so as not to rotate in the circumferential direction with respect to the shaft by simply inserting the first end portion of the shaft into the first collar. Assembling performance is improved.

  More specifically, the slit has a narrow portion in the circumferential direction and a wide portion, and the narrow portion is bent radially inward to form the locking bent portion. The concave portion is constituted by the locking bent portion, and the first hook portion is locked to the locking bent portion.

  More specifically, a plurality of winding portions at the first end portion of the first coil spring are set around the first collar, and a plurality of winding portions at the second end portion are set to the second collar. Can be set around.

  In this way, by setting a plurality of winding portions around the collar at both ends of the first coil spring, the first coil spring can be tightened in a more stable state.

Preferably, the second coil spring has the same diameter and the same size as the first coil spring,
The second end of the shaft has the same outer diameter as the first collar and has a second longitudinal groove on the surface thereof, and the second free end of the second cylinder is 2 It has a cylindrical spring seat fixed so as to close the free end,
The second coil spring is formed such that, at the first end portion, a part of the winding portion is disposed around the second end portion of the shaft and is bent radially inward from the tip end of the first end portion. The first hook portion is locked to the second longitudinal groove, and at the second end portion, a part of the winding portion is disposed around the spring seat, A second hook portion formed by bending inward in the radial direction from the tip of the second end portion may be provided, and the second hook portion may be locked to the spring seat.

  By doing in this way, all the coil springs used with this door hinge can be made into single size and a single shape, and manufacturing cost can be held down.

  Hereinafter, embodiments of a door hinge according to the present invention will be described with reference to the accompanying drawings.

It is a front fragmentary sectional view of the door hinge which concerns on one Embodiment of this invention. It is side surface sectional drawing which follows the II-II line of the door hinge of FIG. It is side surface sectional drawing which follows the III-III line of the door hinge of FIG. It is a front view of the 1st collar of the door hinge of FIG. FIG. 5 is a side view of the first collar of FIG. 4. It is a front view of the axis | shaft of the door hinge of FIG.

  As shown in FIG. 1, a door hinge 100 according to an embodiment of the present invention has a first cylinder 112 to which a first blade 118 attached to a door is fixed, and a second blade 128 to be attached to a door frame. A second cylinder 122. The first and second cylinders 112 and 122 are arranged in alignment in the direction of the longitudinal axis 10, and the first connection end 116 of the first cylinder 112 and the second connection end 126 of the second cylinder 122. The first and second cylinders 112 and 122 are connected so as to be relatively rotatable. A shaft 140 is disposed in the first cylinder 112, and the shaft 140 has a first end 142 fixed to the first free end 114 of the first cylinder 112 and a second end 144. The first cylindrical body 112 passes through the first connection end and reaches the second cylindrical body 122. A ring bush 193 for fixing the shaft 140 to the first cylinder 112 is press-fitted and attached to the first free end 114 of the first cylinder 112. That is, the first end 142 of the shaft 140 in which the first longitudinal groove 147 is formed is inserted into the hole formed in the center of the ring bush 193, and the upper side of the first longitudinal groove 147 as viewed in the drawing is inserted. The shaft 140 and the ring bush 193 are fixed so as not to rotate relative to each other by driving a set pin 194. The second end portion 144 of the shaft 140 is rotatably supported by a bearing member 130 that is press-fitted and fixed to the second connection end portion 126 of the second cylindrical body 122. A first coil spring 170, which is a torsion coil spring, is set around the shaft body 146 between the first and second ends of the shaft 140 in the first cylindrical body 112, and both ends thereof are respectively set. The first and second hook portions 172 and 174 are bent inward in the radial direction. The first hook part 172 is locked to a first collar 150 fixed around the first end 142 of the shaft 140, and the second hook part 174 is a second collar formed integrally with the bearing member 130. It is locked to 160. The outer diameter of the shaft body 146 is set so as to be close to the inner peripheral surface of the first coil spring 170 but not in contact therewith.

  The first collar 150 has a substantially cylindrical shape as shown in FIGS. 4 and 5 and has a slit 152 extending in the longitudinal axis direction. The slit 152 is divided into a narrow portion 154 and a wide portion 156, and a locking bent portion 158 is formed by bending both sides of the narrow portion 154 radially inward. . As shown in FIG. 2, the first collar 150 is coaxially disposed on the first end 142 of the shaft 140, and the inner side surface of the locking bent portion 158 of the first collar 150 is the first longitudinal direction of the shaft 140. By engaging the directional groove 147, the first collar 150 is prevented from rotating with respect to the shaft 140. An end surface 159 on the wide portion 156 side of the locking bent portion 158 is an end portion 148 on the second end side of the first longitudinal groove 147 provided on the first end portion 114 of the shaft 140 shown in FIG. Specifically, the first collar 150 moves to the second end 144 side of the shaft 140 by engaging with an end 148 that gradually becomes shallower and ends as it goes toward the second end 144 of the shaft 140. It is also not to do. Since the first collar 150 can be manufactured by sheet metal processing, it can be manufactured at a relatively low cost.

  In the present embodiment, the first hook portion 172 and the second hook portion 174 of the first coil spring 170 are shorter than the first hook portion 172, as can be seen from FIGS. However, this is because when the first coil spring 170 is inserted from the first end 142 side of the shaft 140 with the first collar 150 attached to the shaft 140, the second hook portion 174 is connected to the first collar 150. This is to prevent the interference and the smooth insertion. As shown in FIG. 2, the first hook portion 172 is locked to the outer surface of the locking bent portion 158 of the first collar 150, and the second hook portion 174 is a second collar as shown in FIG. It is locked in a hook locking groove 162 provided in 160. In this way, the first hook portion 172 of the first coil spring 170 is substantially fixed to the first cylindrical body 112 side, and the second hook portion 174 is substantially fixed to the second cylindrical body 122 side. Therefore, when the first cylinder 112 rotates relatively coaxially with the second cylinder 122, the first hook part 172 side rotates while the second hook part 174 of the first coil spring 170 is fixed. Then, the first coil spring 170 is twisted between the first hook part 172 and the second hook part 174. When the door hinge 100 is attached to the door, the first coil spring 170 is wound around when the door is opened so that the first coil spring 170 is fed with a closing force.

  As can be seen from FIG. 2, since the outer peripheral surface of the first collar 150 and the inner peripheral surface of the first coil spring 170 are close to each other, the first hook portion 172 is locked to a position close to the bent portion 173 at the base. The bent portion 158 is engaged. That is, even if the first hook portion 172 is short, it can perform the necessary engagement with the first collar 150. Therefore, the bending moment applied from the shortened first hook portion to the bending portion 173 can be kept small. As can be seen from FIG. 3, in the second hook portion 174 as well, the outer peripheral surface of the second collar 160 and the inner peripheral surface of the first coil spring 170 are close to each other, and therefore the second hook portion 174 is shortened. The bending moment to the bending portion 175 at the base can be kept small.

  In the first coil spring 170 composed of a plurality of winding portions, approximately three turns on the first hook portion 172 side are arranged around the first collar 150, and approximately three turns on the second hook side are the second collar 160. Are arranged around. For example, both ends of the coil spring are bent outward in the axial direction as in the conventional one described above to form a hook portion, and when the door is opened, the hook portion is relatively affected by the torque in the opposite direction. When the coil spring is to be tightened, the coil spring is easily deformed such that its longitudinal central axis is curved or meandered. However, in the door hinge according to the present invention, as described above, a plurality of Since the winding portions are arranged around the outer peripheral surface of each collar 150, 160, these winding portions are stably tightened around each collar 150, 160 (and therefore around the longitudinal central axis). As a result, the entire first coil spring 170 is wound in a stable state, so that the above-described bending is suppressed.

  The door hinge 100 according to the present embodiment further includes a second coil spring 180 in the second cylindrical body 122. The second coil spring 180 has the same form as the first coil spring 170 in the first cylinder 112. The second end 144 of the shaft 140 extends beyond the bearing member 130 and into the end of the second coil spring 180, and a second portion similar to the first longitudinal groove 147 is formed in the extended portion. It has a longitudinal groove 149. The second end 144 having the second longitudinal groove 149 has a larger outer diameter than the shaft body 146, and its size is substantially the same as the outer diameter of the first collar 150. A spring seat 190 is inserted into the second free end 124 of the second cylinder 122 and is fixed to the second cylinder 122 with a stop pin 196. The spring seat 190 has substantially the same outer diameter as the second end 144 of the shaft 140, extends coaxially into the end of the second coil spring 180, and has a hook locking groove 191. Part 192. Similar to the first coil spring 170, both end portions of the second coil spring 180 are bent inward in the radial direction to form a first hook portion 182 and a second hook portion 184, respectively. The directional groove 149 and the hook locking groove 191 of the spring seat 190 are locked. When the first cylinder 112 rotates relatively coaxially with the second cylinder 122, the shaft 140 fixed to the first cylinder 112 also rotates, so that one end of the shaft 140 is connected to the second end 144 of the shaft 140. The second coil spring 180 that is locked is also twisted. That is, when the first cylinder 112 is rotated, the second coil spring 180 is simultaneously twisted together with the first coil spring 170, so that the rotational biasing force (door closing force) on the first cylinder 112 is the first coil spring 170. And the second coil spring 180 are combined forces of elastic forces generated respectively.

  As a result of the above effects, in the door hinge 100 according to this embodiment, the gaps between the inner periphery of the first and second cylindrical bodies 112 and 122 and the outer periphery of the first and second coil springs 170 and 180 are extremely small. As a result, the diameter of the door hinge can be reduced. Even if the size is reduced in this way, the coil springs 170 and 180 do not contact the inner peripheral surfaces of the cylinders 112 and 122 during the opening / closing operation, or light contact that does not generate a large frictional force even if they contact. Only happens. Due to the elimination of excessive contact between the coil springs 170, 180 and the cylinders 112, 122, excessive stress on the hook portions 172, 174, 182, 184 of the coil springs 170, 180 in particular. Since it no longer occurs, it has been confirmed that the door hinge 100 according to the present embodiment operates normally without damage to the coil springs 170 and 180 even in the opening and closing operation of 1 million times.

  As mentioned above, although one Embodiment of the door hinge concerning this invention has been described in detail, this invention is not limited to this embodiment. For example, the first collar is for providing a portion having a larger diameter than the shaft main body at the end of the shaft main body, and may be formed integrally with the shaft main body 146 as an inventive concept. The second collar 160 may be a separate member from the bearing member.

DESCRIPTION OF SYMBOLS 10 Longitudinal axis 100 Door hinge 112 1st cylinder 114 1st free end part 116 1st connection end part 118 1st blade | wing 122 2nd cylinder body 124 2nd free end part 126 2nd connection end part 128 2nd blade | wing 130 Bearing member 140 Shaft 142 First end portion 144 Second end portion 146 Shaft body 147 First longitudinal groove 148 End portion 149 Second longitudinal groove 150 First collar 152 Slit 154 Narrow portion 156 Wide portion 158 Engagement Bending portion 159 End face 160 Second collar 162 Hook locking groove 170 First coil spring 172 First hook portion 173 Bending portion 174 Second hook portion 175 Bending portion 180 Second coil spring 182 First hook portion 184 Second hook Part 190 spring seat 191 hook locking groove 192 spring locking part 193 ring bushing 194 set pin 196 locking pin

Claims (8)

A first cylinder having a first free end at one end, a first connection end at the other end, and a first blade attached to one of the door and door frame on the outer surface;
A second cylinder having a second free end at one end, a second connection end at the other end, and a second blade attached to the other of the door and the door frame on the outer surface, wherein the second connection A second cylinder that is adjacent to the first connection end and is aligned with the first cylinder in the longitudinal axis direction and is connected to the first cylinder so as to be relatively rotatable. Body,
A bearing member fixed to the second connecting end of the second cylinder;
From the first end, a first end fixed to the first free end of the first cylinder, a second end adjacent to the second connection end in the second cylinder, and the first end A shaft body that extends concentrically in the first cylindrical body, passes through the bearing member and reaches the second connection end, and is rotatably supported by the bearing member;
A first coil spring having a plurality of winding portions and having substantially the same diameter over the entire length and provided concentrically around the shaft body in the first cylinder, the first end portion of the shaft A first coil spring having a first end coupled to the bearing member and a second end coupled to the bearing member;
A second coil spring having a plurality of winding portions and having substantially the same diameter over the entire length and provided concentrically in the second cylinder, the first coil spring being connected to the second end of the shaft A second coil spring having an end and a second end coupled to the second free end of the second cylinder;
With
When the first and second cylinders are relatively rotated by the opening operation, the first and second coil springs are wound and the closing force is fed.
The shaft has a first collar whose diameter is larger than that of the shaft body at a position adjacent to the first free end.
The bearing member has a second collar disposed around the shaft body at a position adjacent to the first connecting end in the first cylinder.
The first coil spring is disposed at the first end of the first coil spring, with a portion of the winding portion being disposed in the vicinity of the first collar, and having a radius from the tip of the first end. A first hook portion that is bent inward in the direction, and the first hook portion is locked to the first collar, and the winding is provided at the second end of the first coil spring. A portion of the portion is disposed in the vicinity of the second collar, and has a second hook portion formed by being bent radially inward from the tip of the second end portion, the second hook portion being The door hinge is locked to the second collar.   The door hinge according to claim 1, wherein the first and second coil springs are made of a spring material having a circular cross section.   The door hinge according to claim 1 or 2, wherein the first collar is a cylindrical member formed separately from the shaft main body, and is fixed to the shaft main body.   The first collar is a cylindrical member having a recess extending in the longitudinal direction, and the first hook portion of the first coil spring is engaged with the recess. Door hinge.   The first collar is a cylindrical member having a slit extending in the longitudinal direction, and has a locking bent portion formed by bending at least a part of the slit inward in the radial direction. The first end portion is provided with a first longitudinal groove, and the locking bent portion is engaged with the first longitudinal groove so that the first collar is fixed so as not to rotate in the circumferential direction. The door hinge according to claim 4.   The slit has a narrow portion in the circumferential direction and a wide portion, and the narrow portion is bent inward in the radial direction to form the locking bent portion, and the concave portion is the engagement portion. The door hinge according to claim 5, wherein the door hinge is configured by a stopping bent portion, and the first hook portion is locked to the locking bent portion.   A plurality of winding portions at the first end of the first coil spring are set around the first collar, and a plurality of winding portions at the second end are set around the second collar. The door hinge according to any one of claims 1 to 6. The second coil spring has the same diameter and size as the first coil spring;
The second end of the shaft has the same outer diameter as the first collar and has a second longitudinal groove on the surface thereof, and the second free end of the second cylinder is 2 It has a cylindrical spring seat fixed so as to close the free end,
The second coil spring is formed such that, at the first end portion, a part of the winding portion is disposed around the second end portion of the shaft and is bent radially inward from the tip end of the first end portion. The first hook portion is locked to the second longitudinal groove, and at the second end portion, a part of the winding portion is disposed around the spring seat, 8. The device according to claim 1, further comprising a second hook portion formed by bending inward in a radial direction from a tip of the second end portion, wherein the second hook portion is locked to the spring seat. The door hinge described in the crab.

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