JP2020139295A - Auxiliary door closer and hinged door body structure - Google Patents

Abstract

To provide an auxiliary door closer capable of reliably rotating a door member to a closing position.SOLUTION: A hinged door body structure 100 includes a door member 110 for closing a door frame opening 122, a door pocket 112 for housing the door member 110 in an open position, and an auxiliary door closer 114 arranged between the door member 110 and the door pocket 112. The auxiliary door closer 114 includes a base member 124 fixed to the door pocket 112, and a rotating member 126 for holding a roller 146 abutting on the door member 110. The rotating member 126 is attached in a rotatable manner to the base member 124, and is urged in the rotating direction by a coil spring set in a cylindrical part of the base member 124. The auxiliary door closer 114 applies a force in the closing direction to the door member 110 by the urging force of the coil spring. As the door member 110 is caused to be closed, the roller 146, while moving on the door member 110, continues to press the door member until the door member 110 closes fully the door frame opening 122.SELECTED DRAWING: Figure 8

Description

The present invention relates to an auxiliary door closer for assisting the hinged door to close, and a hinged door structure having an auxiliary door closer.

The hinged door type fire door is normally housed in the door pocket in the open position, and when a fire is detected, it is released from the door pocket and automatically rotates in the closing direction to open the door frame opening that was a passage. It is designed to be closed. A door closer is attached to the fire door, and the fire door is closed by the urging force of the door closer. However, depending on the situation of the fire, the air expansion caused by the fire causes the flow of air through the door frame opening, and the pressure of the air hinders the movement of the fire door, making it impossible to close the door frame opening completely. Can happen. That is, a pressure difference is generated on both sides of the fire door, which may cause a situation in which the door frame opening cannot be completely closed only by the urging force of the door closer.

Such a problem has been known for a long time, and as a countermeasure, a passage for air to pass through the fire door is temporarily formed when the fire door is closed to reduce the pressure applied to the fire door. Those have been proposed (for example, Patent Document 1). In addition, if the urging force of the door closer is increased, the fire door can be closed completely, but since the door closer is usually placed inside the fire door and its size is limited, it can also be used as the urging force of the door closer. There is a limit.

JP-A-2018-7889

An object of the present invention is to provide an auxiliary door closer that can solve the above-mentioned conventional problems by simpler means.

That is, the present invention
A door member that closes the door frame opening in the hinged door and a stationary member that is substantially stationary when the door member closes the door frame opening are arranged to assist the door member in closing. Auxiliary door closer to
A base member fixed to one of the door member and the stationary member,
A rotating main body rotatably attached to the base member around the rotating axis, and the other of the door member and the stationary member provided on the rotating main body at a position away from the rotating axis. A rotating member having a contact portion, which is made to contact the member of the
An urging member set between the base member and the rotating member and urging the rotating member in a direction in which the contact portion is pressed against the other member.
With
When the door member closes, the contact portion moves on the other member and presses the other member until the door member closes the door frame opening, so that the door member closes to the door member. Provide an auxiliary door closer designed to apply force.

The auxiliary door closer is fixed to only one of the door member and the stationary member, and the contact portion abuts and presses against the other member while moving on the other member. ing. Therefore, it is not necessary to accurately determine the mounting position of the auxiliary door closer, and the mounting is easy. In addition, it is possible to easily retrofit a door member that has already been installed. With such an auxiliary door closer, it is possible to apply a force in the closing direction of the door member so that the door frame opening is completely closed even if the door member receives pressure.

Further, the urging member has a first coil spring extending along the rotation axis, one end of the first coil spring is fixed to the base member in the rotational direction, and the other end of the first coil spring is said. It can be fixed to the rotating member in the direction of rotation.

Furthermore,
A fixing portion in which the base member is fixed to the one member, a tubular portion extending in a tubular shape along the rotation axis to accommodate the first coil spring, and a cylindrical portion of the rotation axis in the tubular portion. It has an urging force adjusting member that is rotatably arranged around and fixes one end of the first coil spring in the rotational direction.
The tubular portion has an opening in its peripheral wall.
The urging force adjusting member has a plurality of insertion holes provided on the outer peripheral surface thereof at intervals in the circumferential direction, and a locking pin selectively inserted into one of the plurality of insertion holes. And
The locking pin projects into the opening and abuts on the inner peripheral surface of the opening so that the rotational position of the urging force adjusting member is fixed.

With such a configuration, it is possible to adjust the urging force of the first coil spring by rotating the urging force adjusting member and inserting the locking pin into an appropriate insertion hole.

Also,
The urging force adjusting member is arranged at a substantially central position of the tubular portion in the direction of the rotation axis.
The urging member further comprises a second coil spring extending along the rotation axis in the tubular portion and arranged on the opposite side of the first coil spring to the urging force adjusting member. One end of the two coil spring is fixed to the urging force adjusting member in the rotational direction, and the other end of the second coil spring is fixed to the rotating member in the rotational direction.
The winding directions of the first coil spring and the second coil spring can be opposite to each other.

Furthermore,
The urging force adjusting member has a first urging force adjusting member for fixing one end of the first coil spring and a second urging force adjusting member for fixing one end of the second coil spring.
The first urging force adjusting member and the second urging force adjusting member are arranged side by side in the direction of the rotation axis, and are rotatably arranged independently of each other in the tubular portion, and each of the plurality of insertion holes and the plurality of insertion holes is arranged. It can be made to have a locking pin.

With such a configuration, the urging force of the first coil spring and the second coil spring can be adjusted separately, and the urging force can be adjusted more finely. Further, since the first coil spring and the second coil spring are twisted separately, the required force is halved as compared with the case where the two are twisted at the same time, and the urging force can be adjusted more easily.

Further, the contact portion can be made to be a roller rotatably held by the rotating main body portion.

Furthermore,
The rotation main body portion extends from the base member in the radial direction of the rotation axis and is urged by the urging member, and a parallel axis parallel to the rotation axis and away from the rotation axis. It is rotatably attached to the first member around the surface, extends in the radial direction of the parallel axis, and is set between the first member and the second member and the second member provided with the corresponding contact portion. Auxiliary urging member that urges the second member in a direction in which the contact portion is pressed against the other member.
When the door member closes, the second member rotates by the urging force of the auxiliary urging member and bends within a predetermined angle range with respect to the first member, and the first member and the second member The rotating member can be rotated with respect to the base member until the door member closes the door frame opening while maintaining the bent state within the predetermined angle range.

With such a configuration, even when the door member rotates more than 90 ° from the open position to the closing position where the door frame opening is closed, for example, 180 °, the rotating member does not interfere with the door member, and the door member does not interfere with the door member. It becomes possible to keep pressing until the closing position.

The present invention also
A hinged door consisting of a single door member that closes the door frame opening,
A door pocket that accommodates the door member when the door member is in the open position,
An auxiliary door closer, which is arranged between the door member and the door pocket and assists the door member to close, and any of the above-mentioned auxiliary door closers.
Provide a hinged door structure comprising.

The present invention further
It is a folding door type hinged door composed of a plurality of door members rotatably connected to each other, and is closed sequentially from the door member on the hanging side of the hinged door toward the door member on the tip side of the hinged door. With a hinged door,
It is arranged between the most distal door member of the plurality of door members and another door member adjacent to the most distal door member and rotatably holding the most distal door member. , Any of the auxiliary door closers described above that assists the closing of the most distal door member,
Provide a hinged door structure comprising.

Hereinafter, embodiments of the auxiliary door closer and the hinged door structure according to the present invention will be described with reference to the accompanying drawings.

It is a top view of the hinged door structure which concerns on 1st Embodiment of this invention. It is a side view of the hinged door structure of FIG. It is a side view of the auxiliary door closer attached to the hinged door structure of FIGS. 1 and 2. It is a figure which shows the state which the rotating member is rotated in the auxiliary door closer of FIG. It is a partial cross-sectional view of the auxiliary door closer of FIG. It is the first figure which shows the operation of the auxiliary door closer, and is the figure which shows the state which the hinged door is in an open position. It is the 2nd figure which shows the operation of the auxiliary door closer, and is the figure which shows the state which the hinged door is closed halfway. It is a 3rd figure which shows the operation of the auxiliary door closer, and is the figure which shows the state which the hinged door is in the closing position which closed the door frame opening completely. It is a figure which shows the hinged door structure which concerns on the 2nd Embodiment of this invention. It is a 1st figure which shows the operation of the hinged door structure which concerns on 3rd Embodiment of this invention, and is the figure which shows the state which the hinged door is in an open position. It is the 2nd figure which shows the operation of the hinged door structure of FIG. 10, and is the figure which shows the state which the door member of a hanging source side is in a closed position, and the door member of a tip side is in an open position. It is a 3rd figure which shows the operation of the hinged door structure of FIG. 10, and is the figure which shows the state which the door member on the tip side is in the closing position which closed the door frame opening completely. It is a side view of the hinged door structure in the state of FIG. It is a 1st figure which shows the operation of the hinged door structure which concerns on 4th Embodiment of this invention, and is the figure which shows the state which the hinged door is in an open position. It is the 2nd figure which shows the operation of the hinged door of FIG. 14, and is the figure which shows the state which the hinged door is closed halfway. It is a 3rd figure which shows the operation of the hinged door of FIG. 14, and is the figure which shows the state which the hinged door is in the closing position which closed the door frame opening completely. It is a partial sectional view of the auxiliary door closer in the hinged door structure which concerns on 4th Embodiment.

As shown in FIG. 1, the hinged door structure 100 according to the first embodiment of the present invention includes one door member 110 constituting a hinged door, a door bag 112 accommodating the door member 110, and the door member 110 and the door bag 112. It is provided with an auxiliary door closer 114 arranged between and. As shown in FIG. 2, the door member 110 is rotatably held by an upper hinge 116 attached to the upper surface and a lower hinge 118 attached to the lower surface. The lower hinge 118 has a door closer 120 having a coil spring inside, and is urged in a direction of closing the door member 110 (in the direction of the arrow in FIG. 1) by the urging force of the coil spring. The hinged door structure 100 is used as a fire door, and normally, the door member 110 is locked at the open position shown by the solid line in FIG. 1, and the lock is released when a fire occurs. Therefore, the door member 110 automatically rotates to the closing position shown by the broken line in FIG. 1 mainly by the urging force of the door closer 120 of the lower hinge 118, and rotates to the closing position where the door frame opening 122 is closed. There is. The auxiliary door closer 114 described in detail below assists the door member 110 to close by applying a force in the closing direction to the door member 110.

As shown in FIGS. 3 to 5, the auxiliary door closer 114 has a base member 124 fixed to the door pocket (stationary member) 112 and a rotating member rotatably attached to the base member 124 around the rotation axis R. It includes 126 and two coil springs (biasing members) 128 and 130 set between the base member 124 and the rotating member 126.

The base member 124 has a fixing portion 136 having four screw insertion holes 134 through which screws 132 for fixing to the door pocket 112 are passed, and a tubular portion 138 extending in a tubular shape along the rotation axis R. The base member 124 further includes a first urging force adjusting member 140 and a second urging force adjusting member 142 arranged side by side at a central position in the direction of the rotation axis R in the tubular portion 138. The first urging force adjusting member 140 and the second urging force adjusting member 142 are rotatable about the rotation axis R in the tubular portion 138, respectively. The rotating member 126 is rotatably held by the rotating main body 144, which is rotatably attached to the tubular portion 138 of the base member 124 around the rotating axis R, and the rotating main body 144 at a position away from the rotating axis R. It has a roller (contact portion) 146. A first spring fixing member 148 and a second spring fixing member 150 extending from both ends of the tubular portion 138 into the tubular portion 138 are attached to the rotating main body portion 144, respectively. One end 128a of the first coil spring 128 is locked in the locking groove 152 of the first urging force adjusting member 140 and fixed in the rotational direction, and the other end 128b is locked in the locking groove 154 of the first spring fixing member 148. It is locked and fixed in the direction of rotation. Similarly, one end 130a of the second coil spring 130 is locked in the locking groove 156 of the second urging force adjusting member 142 and fixed in the rotational direction, and the other end 130b is the locking groove of the second spring fixing member 150. It is locked to 158 and fixed in the direction of rotation. The winding directions of the first coil spring 128 and the second coil spring 130 are opposite to each other, and the rotating member 126 is urged from the position of FIG. 3 toward the position of FIG. A plurality of insertion holes 160 are formed on the outer peripheral surface of the first urging force adjusting member 140 at intervals in the circumferential direction, and a locking pin 162 is inserted into one of them. An opening 164 is formed in the peripheral wall of the tubular portion 138, and the locking pin 162 projects into the opening 164 and abuts on the inner peripheral surface 164a of the opening 164. As a result, the position of the first urging force adjusting member 140 in the rotational direction is fixed. By rotating the first urging force adjusting member 140 with the locking pin 162 removed, the urging force can be adjusted by changing the twist amount of the first coil spring 128. By inserting the locking pin 162 into the insertion hole 160 at the position of the opening 164 when the urging force becomes arbitrary, the position of the first urging force adjusting member 140 in the rotational direction is fixed again, and the first coil The urging force of the spring 128 is maintained at the adjusted size. Similarly, the second urging force adjusting member 142 also has a plurality of insertion holes 166 and locking pins 168, and the urging force of the second coil spring 130 can be adjusted by the second urging force adjusting member 142. Since the first urging force adjusting member 140 and the second urging force adjusting member 142 can rotate independently of each other, the urging forces of the first coil spring 128 and the second coil spring 130 can be adjusted separately. it can.

As shown in FIG. 6, the auxiliary door closer 114 is arranged between the door pocket 112 and the door member 110 in a state of being fixed to the door pocket 112. At this time, the rotating member 126 is urged counterclockwise as seen in the figure by the urging force of the first coil spring 128 and the second coil spring 130. The roller 146 is arranged so as to come into contact with the door member 110, and is pressed against the door member 110.

In the state of FIG. 6, the door member 110 is locked in the open position by a lock mechanism (not shown). When this lock is released, the door member 110 receives the urging force of the auxiliary door closer 114 in addition to the urging force of the door closer 120 arranged inside the door member 110, and is viewed in the figure toward the closing position. It rotates counterclockwise (Fig. 7). Since the rotation axis S of the door member 110 and the rotation axis R of the auxiliary door closer 114 are at different positions, the position where the roller 146 comes into contact with the door member 110 moves with the rotation of the door member 110. Specifically, the contact position of the roller 146 gradually moves toward the rotation axis S side of the door member 110 as the door member 110 rotates toward the closing position. At this time, the roller 146 rotates on the door member 110, so that the contact position is smoothly moved. The roller 146 continues to press the door member 110 until the door member 110 reaches the closing position (FIG. 8) that closes the door frame opening 122. The door member 110 receives the urging force of the auxiliary door closer 114 in addition to the urging force of the door closer 120, moves to the closing position, and is maintained at the closing position.

In the hinged door structure 200 according to the second embodiment of the present invention shown in FIG. 9, the method of attaching the auxiliary door closer 114 to the hinged door structure 100 of the first embodiment is different. Specifically, the base member 124 is fixed to the door member 110, and the auxiliary door closer 114 is attached so that the roller 146 comes into contact with the door pocket 112. In the embodiment, the roller 146 presses the door pocket 112 to apply a force in the closing direction to the door member 110. The position where the roller 146 comes into contact with the door pocket 112 moves upward as seen in the drawing as the door member 110 rotates toward the closing position.

The hinged door structure 300 according to the third embodiment of the present invention shown in FIGS. 10 to 13 has a folding door type hinged door 310 composed of two door members 310A and 310B rotatably connected to each other. .. As shown in FIG. 13, the door member 310A on the hanging side of the hinged door 310 is rotatably held by an upper hinge 316 attached to the upper surface and a lower hinge 318 attached to the lower surface. The lower hinge 318 has a door closer 320. The door member 310A on the hanging side and the door member 310B on the tip side are rotatably connected by an upper hinge 321 and a lower hinge 323 having a door closer 325. Further, the same auxiliary door closer 114 as in the first and second embodiments is arranged between the door member 310A on the hanging side and the door member 310B on the tip side. Specifically, the base member 124 is fixed to the door member 310A on the hanging side, and the roller 146 is arranged so as to abut on the door member 310B on the tip side.

When the hinged door 310 is in the open position shown in FIG. 10, the door member 310A on the hanging side of the hinged door 310 is locked by the lock mechanism (not shown), and the door member 310B on the tip side is locked by the lock mechanism (not shown). It is locked to the door member 310A on the hanging side. When the lock of the door member 310A on the hanging source side is released, the hinged door 310 is rotated toward the closing position by the door closer 320 built in the door member 310A on the hanging source side. As shown in FIG. 11, when the door member 310A on the hanging source side reaches the closing position, the lock of the door member 310B on the tip side is automatically released, and the door member 310B on the tip side is closed by the door closer 320 and the auxiliary door closer 114. Rotate towards. Since the rotation axis T of the door member 310B on the tip side and the rotation axis R of the auxiliary door closer 114 are at different positions, the position where the roller 146 comes into contact with the door member 310B on the tip side is the rotation of the door member 310B on the tip side. It will move with it. Specifically, the contact position gradually approaches the rotation axis R of the front end side door member 310B as the front end side door member 310B rotates. At this time, the roller 146 rotates on the door member 310B on the tip side, so that the contact position is smoothly moved. The roller 146 continues to press the front door member 310B until the front end side door member 310B reaches the closing position (FIG. 12) that closes the door frame opening 322. The door member 310B on the tip side receives the urging force of the auxiliary door closer 114 in addition to the urging force of the door closer 320, moves to the closing position, and is maintained at the closing position. In the embodiment, the auxiliary door closer 114 may be arranged so that the base member 124 is fixed to the door member 310B on the tip side and the roller 146 comes into contact with the door member 310A on the hanging side. Further, the hinged door may be a folding door having three or more door members. In this case, the auxiliary door closer 114 is arranged between the door member on the most tip side and the door member adjacent to the door member on the most tip side and rotatably holding the door member on the tip end side.

In the hinged door structure 400 according to the fourth embodiment of the present invention shown in FIGS. 14 to 17, the door member 410 is rotated by about 180 ° from the open position (FIG. 14) to the closed position (FIG. 16). ing. As shown in FIG. 17, in the auxiliary door closer 414 of the embodiment, the rotating main body portion 444 includes a first member 444A and a second member 444B. The first member 444A extends from the base member 424 in the radial direction of the rotation axis R, and is urged in the rotation direction by the first and second coil springs 428 and 430 incorporated in the tubular portion 438. The second member 444B is rotatably attached to the first member 444A around a parallel axis U located parallel to the rotation axis R and away from the rotation axis R. A roller 446 is rotatably attached to the second member 444B. Two coil springs (auxiliary urging members) 468 and 470 are set between the first member 444A and the second member 444B, and the second member 444B is attached in the rotation direction by these coil springs 468 and 470. It is being pushed. The two coil springs 468 and 470 are held in the same configuration as the first coil spring 428 and the second coil spring 430. That is, the second member 444B has two urging force adjusting members 472 and 474 in its tubular portion 439, and the first member 444A has two spring fixing members 476 and 478 extending into the tubular portion 439. Each coil spring 468, 470 is fixed between the urging force adjusting member 472, 474 and the spring fixing member 476, 478.

In the hinged door structure 400, the auxiliary door closer 414 is arranged so that the base member 424 is fixed to the door pocket 412 and the roller 446 comes into contact with the door member 410 between the door member 410 and the door pocket 412. As shown in FIG. 14, when the door member 410 is in the open position, the first member 444A and the second member 444B of the rotating member 426 are located substantially in a straight line. As shown in FIG. 15, when the door member 410 is closed from the open position, the second member 444B first rotates and bends with respect to the first member 444A. The rotating member 426 rotates with respect to the base member 424 until the door member 410 reaches the closing position (FIG. 16) while maintaining the state in which the first member 444A and the second member 444B are bent in this way. .. By maintaining the bent state of the first member 444A and the second member 444B, the rotating member 426 does not interfere with the door member 410 even when the door member 410 is in the closed position, and the door member 410 is pressed by the roller 446. You can continue to do so. The bending angle between the first member 444A and the second member 444B is the urging force of each coil spring 428, 430, 468, 470, the urging force of the door closer provided on the door member 410, and the urging force of the door member 410. It changes within a predetermined angle range depending on the rotation position and the like.

As described above, the auxiliary door closer in the present invention includes a door member that closes the door frame opening and a stationary member such as a door pocket or a door member on the hanging side that is stationary when the door member closes the door frame opening. Although it is arranged between the door members, it is only necessary to fix it to only one of the door member and the stationary member, and it is not necessary to fix it to the other member. Further, it is not necessary to align the rotation axis of the rotating member with the rotation axis of the door member. Therefore, it can be easily retrofitted to a hinged door that has already been installed. Further, by attaching a plurality of auxiliary door closers, the closing force of the door member can be further increased. In this case, since the rotation axes of the plurality of auxiliary door closers do not have to coincide with each other, it is not necessary to accurately align the positional relationship with each other, and the installation is easy.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments. For example, although a normally open type fire door is shown as an example of the hinged door structure, a hinged door other than the fire door may be used, or a normally closed type fire door may be used. Auxiliary door closers can also be attached to hinged doors that do not have door closers and used to add closer functionality to the hinged doors. Two coil springs are used as the urging member for urging the rotating member, but it may be composed of one coil spring or three or more coil springs, or by another form of urging member. It may be configured. Further, the place where the auxiliary door closer is fixed is not limited to the door pocket and the door member, and may be fixed to other stationary members such as the door frame and the ceiling. As the contact portion, for example, a resin material having low friction may be slid with respect to the door member or the door pocket instead of the roller.

100 hinged door structure (first embodiment)
110 Door member 112 Door bag (stationary member)
114 Auxiliary door closer 116 Upper hinge 118 Lower hinge 120 Door closer 122 Door frame opening 124 Base member 126 Rotating member 128 First coil spring (biasing member)
128a One end 128b Another end 130 Second coil spring (urging member)
130a One end 130b Another end 132 Screw 134 Screw insertion hole 136 Fixing part 138 Cylindrical part 140 First urging force adjusting member 142 Second urging force adjusting member 144 Rotating body part 146 Roller (contact part)
148 1st spring fixing member 150 2nd spring fixing member 152 Locking groove 154 Locking groove 156 Locking groove 158 Locking groove 160 Insertion hole 162 Locking pin 164 Opening 164a Inner peripheral surface 166 Insertion hole 168 Locking pin 200 hinged door Structure (second embodiment)
300 hinged door structure (third embodiment)
310 Swing door 310A Door member on the hanging side 310B Door member on the tip side 316 Upper hinge 318 Lower hinge 320 Door closer 321 Upper hinge 322 Door frame opening 323 Lower hinge 325 Door closer 400 Door closer structure (fourth embodiment)
410 Door member 412 Door bag 414 Auxiliary door closer 424 Base member 426 Rotating member 428 First coil spring (biasing member)
430 Second coil spring (biasing member)
438 Cylindrical part 439 Cylindrical part 444 Rotating body part 444A First member 444B Second member 446 Roller (contact part)
468 coil spring (auxiliary urging member)
470 Coil spring (auxiliary urging member)
472 Biasing force adjusting member 474 Biasing force adjusting member 476 Spring fixing member 478 Spring fixing member R (rotating member) Rotating axis S (door member) rotating axis T (tip side door member) rotating axis U Parallel axis

Claims (9)

A door member that closes the door frame opening in the hinged door and a stationary member that is substantially stationary when the door member closes the door frame opening are arranged to assist the door member in closing. Auxiliary door closer to
A base member fixed to one of the door member and the stationary member,
A rotating main body rotatably attached to the base member around the rotating axis, and the other of the door member and the stationary member provided on the rotating main body at a position away from the rotating axis. A rotating member having a contact portion, which is made to contact the member of the
An urging member set between the base member and the rotating member and urging the rotating member in a direction in which the contact portion is pressed against the other member.
With
When the door member closes, the contact portion moves on the other member and presses the other member until the door member closes the door frame opening, so that the door member closes to the door member. Auxiliary door closer designed to add force. The urging member has a first coil spring extending along the rotation axis, one end of the first coil spring is fixed to the base member in the rotational direction, and the other end of the first coil spring is the rotating member. The auxiliary door closer according to claim 1, which is fixed in the direction of rotation. A fixing portion in which the base member is fixed to the one member, a tubular portion extending in a tubular shape along the rotation axis to accommodate the first coil spring, and a cylindrical portion of the rotation axis in the tubular portion. It has an urging force adjusting member that is rotatably arranged around and fixes one end of the first coil spring in the rotational direction.
The tubular portion has an opening in its peripheral wall.
The urging force adjusting member has a plurality of insertion holes provided on the outer peripheral surface thereof at intervals in the circumferential direction, and a locking pin selectively inserted into one of the plurality of insertion holes. And
The auxiliary door closer according to claim 2, wherein the locking pin protrudes into the opening and abuts on the inner peripheral surface of the opening so that the position of the urging force adjusting member in the rotational direction is fixed. The urging force adjusting member is arranged at a substantially central position of the tubular portion in the direction of the rotation axis.
The urging member further comprises a second coil spring extending along the rotation axis in the tubular portion and arranged on the opposite side of the first coil spring to the urging force adjusting member. One end of the two coil spring is fixed to the urging force adjusting member in the rotational direction, and the other end of the second coil spring is fixed to the rotating member in the rotational direction.
The auxiliary door closer according to claim 3, wherein the winding directions of the first coil spring and the second coil spring are opposite to each other. The urging force adjusting member has a first urging force adjusting member for fixing one end of the first coil spring and a second urging force adjusting member for fixing one end of the second coil spring.
The first urging force adjusting member and the second urging force adjusting member are arranged side by side in the direction of the rotation axis, and are rotatably arranged independently of each other in the tubular portion, and each of the plurality of insertion holes and the plurality of insertion holes is arranged. The auxiliary door closer according to claim 4, which has a locking pin. The auxiliary door closer according to any one of claims 1 to 5, wherein the contact portion is a roller rotatably held by the rotating main body portion. The rotation main body portion extends from the base member in the radial direction of the rotation axis and is urged by the urging member, and a parallel axis parallel to the rotation axis and away from the rotation axis. It is rotatably attached to the first member around the surface, extends in the radial direction of the parallel axis, and is set between the first member and the second member and the second member provided with the corresponding contact portion. Auxiliary urging member that urges the second member in a direction in which the contact portion is pressed against the other member.
When the door member closes, the second member rotates by the urging force of the auxiliary urging member and bends within a predetermined angle range with respect to the first member, and the first member and the second member Claims 1 to 6 such that the rotating member rotates with respect to the base member until the door member closes the door frame opening while maintaining the bent state within the predetermined angle range. Auxiliary door closer according to any one of the above. A hinged door consisting of a single door member that closes the door frame opening,
A door pocket that accommodates the door member when the door member is in the open position,
The auxiliary door closer according to any one of claims 1 to 7, which is arranged between the door member and the door pocket and assists the door member to close.
A hinged door structure. It is a folding door type hinged door composed of a plurality of door members rotatably connected to each other, and is closed sequentially from the door member on the hanging side of the hinged door toward the door member on the tip side of the hinged door. With a hinged door,
It is arranged between the most tip-side door member of the plurality of door members and another door member adjacent to the most tip-side door member and rotatably holding the most tip-side door member. The auxiliary door closer according to any one of claims 1 to 7, which assists the closing of the most distal door member.
A hinged door structure.

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