WO2013147164A1

WO2013147164A1 - Door closer

Info

Publication number: WO2013147164A1
Application number: PCT/JP2013/059543
Authority: WO
Inventors: 保夫風間
Original assignee: 日東工器株式会社
Priority date: 2012-03-29
Filing date: 2013-03-29
Publication date: 2013-10-03
Also published as: JPWO2013147164A1; JP5782180B2

Abstract

[Problem] To provide a door closer which generates large door closing force immediately before the closure of the door and which has a small outside diameter. [Solution] This door closer (10) has: a hinge housing (20) which comprises a first tube body (14) and a second tube body (18); an inner shaft (34); an outer shaft (36); and a clutch mechanism (38). When the door is located at a position between an initial pivoting position corresponding to a state in which the door is closed and a first pivoting position corresponding to a state in which the door is open by a predetermined angle, the clutch mechanism (38) engages the outer shaft (36) with the first tube body (14), and when the door is located between the first pivoting position and a second pivoting position corresponding to the fully open state of the door, the clutch mechanism (38) releases the outer shaft (36) from the engagement with the first tube body (14) and engages the outer shaft (36) with the inner shaft (34). As a result of this configuration, when the door is located between the initial pivoting position and the first pivoting position, relative rotation occurring between the first and second tube bodies (14, 18) twists the outer shaft (36) and stores elastic restoring force for closing the door.

Description

Door closer

The present invention relates to a door closer. More specifically, the present invention relates to a door closer provided with a clutch mechanism.

A door closer provided with a clutch mechanism is known from Patent Document 1 and Patent Document 2, for example. This known hinge-type door closer is provided so as to overlap along the central axis of the hinge pin, and one is attached to the door frame and the other is attached to the door, and is relatively rotatable as the door is opened and closed. A hinge housing comprising a pair of bladed cylinders, and a main spring and an auxiliary spring for closing the door that is set and opened along the central axis in the hinge housing. The main spring generates a closing torque by being biased over the entire opening angle during the door opening operation. On the other hand, the auxiliary spring is supported by the relative rotation between the two cylinders only at the initial fixed angle of the opening operation, thereby generating a closing torque in this fixed angle range immediately before the closing of the door, and closing the door. Make sure you can do it. The stocking of the auxiliary spring only at a certain angle is performed by a clutch mechanism that connects the other end of the auxiliary spring whose one end is fixed to one cylinder to the other cylinder only at the certain angle. That is, this clutch mechanism causes relative rotation between the two cylinders only during the certain angle.

Japanese Utility Model Publication No. 62-163279 Japanese Utility Model Publication No. 05-024859

The auxiliary spring as described above is used to ensure the closing of the door, and in order to generate a large closing torque for that purpose, it is necessary to feed the entire opening angle and give a gentle closing torque. It is necessary to increase the diameter using a spring material having a larger cross section than the main spring. For this reason, the outer shape of the hinge housing is inevitably large, and there is a possibility that the appearance of the hinge housing as a door fitting will be impaired.

In view of the above, an object of the present invention is to provide a door closer that can have a smaller outer shape than a conventional door closer having equivalent door closing torque characteristics.

That is, the present invention
A cylinder extending along the longitudinal axis;
An inner shaft having first and second ends, extending along the longitudinal axis and rotatably held by the cylinder;
A first end located in the cylinder and a second end fixed so as not to rotate relative to the inner shaft, and an outer side extending outside the inner shaft along the longitudinal axis A shaft,
The cylinder is attached to one of the door and the door frame, the inner shaft is fixed so as not to move relative to the other of the door and the door frame, and the cylinder is opened and closed as the door is opened and closed. A door closer adapted to cause relative rotation with the inner shaft,
The relative rotational position of the cylindrical body and the inner shaft is between an initial rotational position corresponding to a state where the door is closed and a first rotational position corresponding to a state where the door is opened by a predetermined angle. The first end portion of the outer shaft is locked to the cylindrical body, and the door is between the first rotation position and the second rotation position corresponding to the fully open position of the door. A clutch mechanism for releasing the first end of the outer shaft from locking with the cylindrical body and locking the inner shaft with the inner shaft;
When the relative rotation position is between the initial rotation position and the first rotation position, the outer shaft is twisted by the relative rotation generated between the cylindrical body and the inner shaft. The door closer is provided with an elastic restoring force for closing the door.

This door closer gives a closing torque to the door just before the door is closed by twisting the outer shaft only at the initial predetermined angle when the door is rotated, but a large closing just before the door is closed by a coil spring. Unlike conventional door closers that try to give torque, it is not necessary to increase the diameter, and a door closer that is small in diameter and smart in appearance can be obtained.

In particular,
A first cylindrical body comprising the cylindrical body, having a first free end at one end and a first connection end at the other end;
A second cylindrical body having a second free end at one end and a second connection end at the other end and attached to the other of the door and the door frame, the second connection end being the first A second adjacent to the connecting end and aligned with the first cylinder in the direction of the longitudinal axis and connected to the first cylinder so as to be relatively rotatable about the longitudinal axis. A cylindrical body,
The second end portion of the inner shaft can be attached to the second cylinder and fixed to the other of the door and the door frame via the second cylinder.

Preferably, the outer shaft may be a solid cylindrical shaft made of a spring material and the inner shaft made of a rigid member.

Also preferably,
The clutch mechanism includes a cylindrical clutch member fixed to the inner peripheral surface of the first cylinder, and an outer periphery of the inner peripheral surface of the clutch member and the inner shaft fixed to the first end of the outer shaft. A clutch switching element holding member extending between the clutch switching element holding member and an opening penetrating the clutch switching element holding member in the radial direction; and a clutch switching element held in the opening; , And
A first engagement recess for receiving a part of the clutch switching element is provided on the inner peripheral surface of the clutch member, and a second engagement for receiving a part of the clutch switching element on the outer peripheral surface of the inner shaft. A recess is provided,
When the relative rotation position is between the initial rotation position and the first rotation position, the clutch switching element is engaged with the first engagement recess and the clutch switching element holding member is When the clutch member is locked and the relative rotation position is between the first rotation position and the second rotation position, the clutch switching element is the first engagement recess of the clutch member. The clutch switching element holding member can be locked to the inner shaft by engaging with the second engaging recess of the inner shaft without engaging with the inner shaft.

In the door closer described above according to the present invention, the first and second cylinders are provided around the outer shaft, one end is fixed to the first cylinder, and the other end is fixed to the second cylinder. A coil spring can be further provided.

The present invention also provides
A door frame fixing member fixed to the second end of the inner shaft and attached to the door frame;
The cylindrical body is attached to a door, and the inner shaft can be fixed to the door frame via the door frame fixing member,
In such door closers,
The first end of the inner shaft extends beyond the first end of the outer shaft;
The clutch mechanism has a first clutch end surface having a first clutch end surface and fixed to the cylindrical body, and a second clutch end surface facing the first clutch end surface, and the first shaft of the inner shaft. A cylindrical second clutch member fixed to the end, and a clutch switching element holding member fixed to the first end of the outer shaft between the first clutch end surface and the second clutch end surface. A clutch switching element holding member having an opening penetrating the clutch switching element holding member in the direction of the longitudinal axis, and a clutch switching element held in the opening,
The first clutch end surface of the first clutch member is provided with a first engagement recess for receiving a part of the clutch switching element, and the second clutch end surface of the second clutch element is provided with one of the clutch switching elements. A second engaging recess for receiving the portion is provided,
When the relative rotation position is between the initial rotation position and the first rotation position, the clutch switching element is engaged with the first engagement recess and the clutch switching element holding member is The clutch switching element is engaged with the first clutch member when the relative rotation position is between the first rotation position and the second rotation position. The clutch switching element holding member can be engaged with the second clutch member by engaging with the second engagement recess of the second clutch member without engaging with the first engagement recess. .

Preferably, the clutch switching element may have a cylindrical shape with hemispherical ends.

Since the clutch switching element can be slidably engaged with the opening of the switching element holding member on the cylindrical surface and can receive a force over a relatively large area, the member can be damaged even when subjected to a large stress. It is difficult to improve durability.

The door closer described above according to the present invention may further include a coil spring provided around the outer shaft in the cylinder, having one end fixed to the door frame fixing member and the other end fixed to the cylinder. can do.

The present invention further includes an arm link member having one end fixed to the door frame fixing member and the other end fixed to the door frame, and the door frame fixing member is coupled to the door frame via the arm member. You can make it.

Hereinafter, a door closer according to an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a longitudinal section showing the structure of the door closer according to the first embodiment of the present invention. In order to make the function of the clutch mechanism of the door closer easier to understand, it is completely different from FIG. It is a schematic diagram that does not match. 2a to 2c are cross-sectional views taken along the line II-II in FIG. 1, showing the interrelationship among the components when the door closer shown in FIG. 1 is displaced from the closed state to the open state. FIG. 3 is a sectional view taken along line III-III in FIG. 1. FIG. 4 is a cross-sectional view showing the structure of the door closer according to the second embodiment of the present invention, in which the clutch mechanism is in a state corresponding to FIG. 5c so that the elastic restoring force of the outer shaft does not act on the door. It shows the state which has become. 5a to 5c are schematic views showing the operation of the clutch mechanism of the door closer shown in FIG. 4, and are cross-sectional views in a direction crossing the clutch switching element and along the rotational movement direction of the clutch switching element. FIG. 6 is a cross-sectional view showing the structure of a door closer according to the third embodiment of the present invention. FIG. 7 is a side view of FIG.

A hinge-type door closer 10 according to the first embodiment of the present invention is fixed to a first cylinder 14 having a first attachment blade 12 fixed to a door (not shown) and a door frame (not shown). Closer mechanism comprising a hinge housing 20 comprising a second cylinder 18 having a second mounting blade 16 and a coil spring 22 set in the hinge housing 20 and generating a closing force when the door is opened. Part 24. The first and

second cylinders

14 and 18 of the hinge housing 20 have

end caps

26 and 28 attached to the free end portions 14-1 and 18-1, respectively, and connection end portions 14-2. , 18-2 are aligned along the longitudinal axis C of the hinge housing 20 and are connected to each other so as to be rotatable.

The closer mechanism 24 is fixed to the free end 18-1 of the second cylinder 18 from the first end 34-1 rotatably supported by the free end 14-1 of the first cylinder 14. A solid inner shaft 34 extending along the longitudinal axis C of the hinge housing 20 to the second end 34-2, and the second cylinder from the first end 36-1 disposed in the first cylinder 14 A cylindrical outer shaft 36 that extends outside the inner shaft 34 along the longitudinal axis C of the hinge housing 20 to the second end portion 36-2 fixed to the inner end 18, and the outer shaft 36 is connected to the first cylindrical body 14 and the inner side. And a clutch mechanism 38 for selectively locking to the shaft 34. As will be described in detail below, the clutch mechanism 38 has a first end 36-1 of the outer shaft 36 that is rotated together with the door opening in the first fixed rotation range of the door opening. When the outer shaft 36 is twisted with the cylinder 14 and the outer shaft 36 is twisted to accumulate the elastic restoring force in the door closing direction and exceeds a certain rotation range, the first end 36 of the outer shaft 36 is reached. -1 is released from the locked state with the first cylinder 14 and locked to the inner shaft 34 that is stationary with respect to the door frame, so that the outer shaft 36 is not twisted any further. The coil spring 22 is twisted in the entire rotation range when the first cylindrical body 14 is rotated together with the door from the door closing position to the door opening position, thereby accelerating the door closing force.

The first end portion 34-1 of the inner shaft 34 is inserted into the first cylindrical body 14 and is rotatable to a first shaft holder 40 that is fixed to the first cylindrical body 14 by a fixing pin 46 so as not to rotate. Inserted and retained. The second end 34-2 of the inner shaft 34 is inserted into the second shaft holder 48 fixed in the second cylinder 18 so as not to rotate. That is, as shown in FIG. 3, the second end portion 34-2 of the inner shaft 34 is partially chamfered and is fitted into the mounting hole 48-1 of the second shaft holder 48 formed in a corresponding shape. By being inserted, it is prevented from rotating. The second shaft holder 48 is inserted from the left end of the hinge housing 20 as viewed in FIG. 1, and the tip thereof is fixed in the second cylinder 18 (for example, fixed by welding, press fitting after knurling, etc.). It is inserted into the fixing ring 42 and is held so as not to rotate by a pin 44 mounted between the second cylinder 18 and the fixing ring 42. The coil spring 22 has one end connected to the first shaft holder 40 and the other end connected to the second shaft holder 48, and is twisted as the door is opened and closed to store an elastic restoring force. .

The outer shaft 36 is a cylindrical member, and the second end 36-2 of the outer shaft 36 is fixed to the outer peripheral surface near the second end 34-2 of the inner shaft 34, whereby the second cylindrical body 18 is attached. The first end 36-1 extends to a position beyond the central portion of the first cylindrical body 14 so as not to rotate. The outer shaft 36 is not fixed to the inner shaft 34 except for the portion of the second end 36-2. A cylindrical clutch switching element holding member 52 for holding the clutch switching element 50 formed in a roller shape is fixed to the outer peripheral surface of the first end portion 36-1 of the outer shaft 36. The clutch switching element holding member 52 extends from the first end portion 36-1 of the outer shaft 36 toward the free end portion 14-1 of the first cylindrical body 14 in the clutch member 54 extending in a cylindrical shape from the first shaft holder 40. A switching element holding opening 52-1 that extends in the radial direction through the switching element holding part 52-1 and holds the clutch switching element 50 so as to be displaceable in the radial direction of the hinge housing 20 is provided. Is provided. As shown in FIG. 2, the switching element holding opening 52-2 is located at a position opposed to the switching element holding portion 52-1 of the clutch switching element holding member 52 in the diameter direction from the diameter of the roller-like clutch switching element 50. Is also provided so as to extend in the circumferential direction of the clutch switching element holding member 52 with a large width.

As shown in FIG. 2, on the inner peripheral surface of the cylindrical clutch member 54 fixed to the first cylindrical body 14, a first engagement recess 54- engaged with the clutch switching element 50 at a position opposed to the diametrical direction. 1 is formed, and a second engaging recess 34-3 is provided on the outer peripheral surface of the inner shaft 34. As described above, the clutch mechanism 38 is configured so that the first end portion 36-1 of the outer shaft 36 (therefore, the clutch switching element holding member fixed to the outer shaft 36) in the initial fixed rotation range of the door opening. 52) is engaged with the clutch member 54 so as to rotate together with the first cylinder 14, and is relatively fixed to the inner shaft 34 which is fixed to the second cylinder 18 fixed to the door frame and does not rotate. Rotation, thereby twisting the outer shaft 36 between the first end 36-1 and the second end 36-2 to feed the urging force in the door closing direction and a constant rotation range. When the door is opened as described above, the first end 36-1 of the outer shaft 36 is released from the locked state with the first cylinder 14 (fixed to the second cylinder 18 fixed to the door frame and stationary. Is locked to the inner shaft 34 and is stationary ( A rotating state), is intended to prevent twisted outer shaft more. FIG. 2a shows the state when the door is closed, in which the clutch switching element 50 is engaged with the first engagement recess 54-1 (of the clutch member 54 that rotates with the door) and on the inside. The shaft 34 is also engaged with the second engaging recess 34-3. When the door starts to open in the direction indicated by the arrow A from this state, the clutch member 54 fixed to the inner peripheral surface of the first cylindrical body 14 fixed to the door rotates in the same direction A (in the illustrated example). When the door is closed, the second engagement recess 34-3 is slightly shifted in the direction A from the corresponding first engagement recess 54-1. As the clutch member 54 rotates in the direction A, the clutch switching element 50 tries to move in the direction A, and the switching element holding portion 52-1 is moved in the direction A. At this time, the clutch switching element 50 receives resistance while moving the switching element holding portion 52-1, and is pushed by the first engagement recess 54-1, and gradually enters the second engagement recess 34-3. It will be pushed in (FIG. 2b). When the door is rotated by a predetermined angle (for example, about 8 °) (FIG. 2c), the clutch switching element 50 is completely removed from the first engagement recess 54-1, and only engaged with the second engagement recess 34-3. It becomes a state. As a result, even if the clutch member 54 fixed to the first tubular body 14 that is rotated in accordance with the further opening operation of the door is further rotated, the clutch switching element is interposed via the clutch switching element 50. The holding member 52 (therefore, the outer shaft 36 that fixes and holds the holding member 52) is not rotated. That is, in the subsequent pivoting operation of the door, the inner shaft 24 and the outer shaft 36 are stationary together with the second cylinder 18 fixed to the door frame, and the urging force of the outer shaft does not act so as to close the door. Thus, only the coil spring 22 is continuously twisted, and the urging force is applied in the direction of closing the door while accelerating the closing force.

In the hinge-type door closer 10 according to the above-described first embodiment of the present invention, the closing force is fed by the twist of the coil spring 22 over the full opening rotation range associated with the opening of the door, and at the beginning of the door opening. In the predetermined angle range, the outer shaft 36 can also be twisted to accumulate additional closing force. In this case, since the additional closing force is supported by the outer shaft 36 extending along the longitudinal axis C of the hinge housing 20, the additional closing force in the above-described conventional hinge-type door closer of this type is described above. Compared to the case where a coil spring is used for force, it is not necessary to increase the diameter of the hinge housing 20 of the door closer 10, and it can be made smaller.

The door closer 110 according to the second embodiment of the present invention shown in FIG. 4 has an upper hinge and a lower hinge attached to the upper and lower sides of the door, and is centered on a common axis (pivotal axis) passing vertically through the upper and lower hinges. Thus, the door is used as an upper or lower hinge in a door hinge device of the type pivotally attached to the door frame. In the illustrated example, the door closer 110 is used as a lower hinge. A cylindrical body 114 that is inserted so as to extend upward from the bottom B of the door D to the inside of the door D, and a lower portion of the door frame F. An inner shaft 134 that is set to a portion (including a floor surface and the like) and extends upward in the cylindrical body 114 is provided. The cylindrical body 114 is attached so as not to rotate with respect to the door D by fixing a door attachment member 112 fixed to the lower end thereof and extending in the horizontal direction to the bottom B of the door. The inner shaft 134 is held by a braking mechanism 160 whose first end 134-1 at the upper end is fixed in the cylinder 114, and the second end 134-2 at the lower end is attached to the door by a bearing 162. The member 112 is rotatably supported and is fixed to the door frame fixing member 118 by a pin 144. The inner shaft 134 is fixed to the door frame F so as not to rotate around the longitudinal axis C by fitting the door frame fixing member 118 to a slide seat R provided on the door frame F. . When the door D is closed and the cylindrical body 114 is rotated relative to the inner shaft 134, the braking mechanism section 160 applies braking to the relative rotation to suppress a sudden movement of the door. For example, the braking mechanism 160 can be filled with oil, and braking can be performed by applying resistance to the oil flow generated by the relative rotation. Various brake devices of this type are known and their details are omitted here.

The closer mechanism part 124 in the door closer 110 of this embodiment includes a cylindrical outer shaft 136 that extends outside the inner shaft 134 along the longitudinal axis C of the cylindrical body 114, and a coaxial outer shaft outside the outer shaft 136. And a clutch mechanism 138 for selectively locking the first end portion 136-1 of the outer shaft 136 to the cylindrical body 114 and the inner shaft 134. The outer shaft 136 has its second end (lower end) 136-2 fixed to the outer peripheral surface near the second end 134-2 of the inner shaft 134, and the first end (upper end) 136-1 is It extends to the vicinity of the braking mechanism portion 160. The outer shaft 136 is not fixed to the inner shaft 134 except for the second end portion 136-2, and the first end portion 136-1 is a part of the first end portion 134-1 of the inner shaft 134. It terminates in the middle of the inner shaft 134 so that the portion is exposed.

The clutch mechanism 138 has a cylindrical clutch switching element holding member 152 fixed to the outer peripheral surface of the first end portion 136-1 of the outer shaft 136, and penetrates the clutch switching element holding member 152 in the direction of the longitudinal axis C. In the switching element holding opening 152-2 formed in this manner, the clutch switching element 150 is held displaceably. The clutch switching element 150 is a cylindrical member whose both end portions are hemispherical. The length of the clutch switching element 150 is longer than the width of the clutch switching element holding member 152 in the direction of the longitudinal axis C, and at least one end is the clutch. The size is such that it always protrudes from the switching element holding member 152. In the door closer 10 according to the first embodiment, two clutch switching elements 50 are provided. However, in this embodiment, the clutch switching element 150 is used in order to obtain a door closer that can open 180 degrees or more. There is only one. When the door opening range is less than 180 degrees, two clutch switching elements 150 may be provided. A cylindrical first clutch member 154 fixed to the cylindrical body 114 by a pin 146 is provided on the lower side of the clutch switching element holding member 152 in FIG. 4, and the outer peripheral surface of the inner shaft 134 is provided on the upper side. A cylindrical second clutch member 156 fixed to the cylinder is provided. The first clutch end surface 154-1 on the side of the first clutch member 154 facing the second clutch member 156 passes through the first engagement recess 154-2 and the first engagement recess centered on the longitudinal axis C. A first clutch guide groove 154-3 is provided so as to draw a circular arc. The second clutch end surface 156-1 on the side of the second clutch member 156 facing the first clutch member 154 is also provided with the same second engagement recess 156-2 and second clutch guide groove 156-3. ing.

One end (upper end) of the coil spring 122 is connected to the first spring seat 140 positioned and fixed to the cylindrical body 114 by the spring set pin 147 below the first clutch member 154, and the other end (lower end) of the coil spring 122 is the second end of the outer shaft 136. It is connected to a second spring seat 148 fixed around the two end portions 136-2, and is twisted between both ends as the door D is opened to store an elastic restoring force.

When the door D is closed, the clutch switching element 150 is engaged with the first engagement recess 154-2 of the first clutch member 154, as shown in the schematic diagram of FIG. When the door D is opened from this state, the first clutch member 154 rotates with the rotation of the cylindrical body 114 fixed to the door D, and is connected to the first clutch member 154 via the clutch switching element 150. The clutch switching element holding member 152 is also rotated at the same time. As a result, the second end portion 136-2 of the outer shaft 136 fixed to the clutch switching element holding member 152 is rotated, whereby the outer shaft 136 is Twisted to accumulate elastic restoring force in the direction of closing the door. When the door is further opened, as shown in FIG. 5b, the upper end of the clutch switching element 150 is moved to the position where it is aligned with the second engagement recess 156-2 of the second clutch member 156 in the vertical direction. It rotates while sliding with the guide groove 154-3 (not shown in FIG. 5). Since the clutch switching element holding member 152 receives a force to the left as viewed in the figure due to the elastic restoring force of the outer shaft 136, the hemispherical lower end of the clutch switching element 150 held by the clutch switching element holding member 152 Is engaged so as to be pressed toward the left with respect to the first engaging recess 154-2. As a result, the clutch switching element 150 receives an upward force from the first engagement recess 154-2, and when the second engagement recess 156-2 aligns with the clutch switching element 150 in the vertical direction as shown in FIG. The clutch switching element 150 moves upward so as to be pushed out from the first engagement recess 154-2 into the second engagement recess 156-2. The clutch switching element 150 is pushed out from the first engagement recess 154-2 of the first clutch member 154 and is completely unlocked from the first engagement recess 154-2, so that the second engagement of the second clutch member 156 is completed. When in the state of being engaged with the mating recess 156-2 (FIG. 5c), the clutch switching element holding member 152 to which the outer shaft 136 is fixed does not move with respect to the stationary inner shaft 134. No more twisting. Further, the first clutch member 154 fixed to the cylindrical body 114 is released from the engagement with the outer shaft 136 that has accumulated the elastic restoring force in the door closing direction, so that the urging force by the outer shaft 136 is applied to the door. Without being transmitted, only the coil spring 122 is continuously twisted to accumulate the closing force.

The door closer 210 according to the third embodiment of the present invention shown in FIGS. 6 and 7 is substantially the same as the door closer 110 according to the second embodiment described above, except for the attachment form to the door D and the door frame F. It has a structure. The door closer 210 is mounted upside down from the door closer 110 of the second embodiment on the door D by a door mounting member 212 fixed to the outer peripheral surface of the cylindrical body 214. Between the door frame fixing member 218 and the door frame F, an arm link member 213 composed of first and second arm links 213-1 and 213-2 is provided, and the end of the first arm link 213-1 is the door frame. The door frame fixing member 218 is connected to the door frame F by being fixed to the fixing member 218 and pivotally attached to the door frame F at the end of the second arm link 213-2. When the door D attached to the door frame F is opened and closed via the hinge H, the rotation of the inner shaft 234 fixed to the arm link member 213 is restricted. A relative rotation occurs between the body 214 and the body 214. With this relative rotation, the closer mechanism 224 functions in the same manner as in the case of the door closer 110 of the second embodiment. That is, the outer shaft 236 is twisted when the door D is opened within a certain rotation range, and the urging force for closing the door D is accumulated. However, the urging force of the outer shaft 236 does not act on the door D, and only the coil spring 222 is continuously twisted to accumulate the closing force.

The

clutch mechanisms

38, 138, and 238 may be any mechanism that has the above-described functions, and are not limited to the above-described embodiment. For example, although the clutch switching element in the second and third embodiments is a cylindrical member whose both end portions are hemispherical, it can also be spherical as in the first embodiment. Further, in the above-described embodiment, the

outer shafts

36, 136, and 236 are twisted at the initial stage of opening the door to increase the closing force just before closing, but the

outer shafts

36, 136, and 236 are stationary. The

inner shafts

34, 134, and 234 can be twisted. The

inner shafts

34, 134, and 234 are solid cylindrical members, but may be hollow cylindrical members. In short, the present invention uses inner and outer shafts provided along the longitudinal axis of the cylinder, and causes a relative twist between the inner and outer shafts within a predetermined angular range where the door begins to open. The door closing force immediately before closing is increased, and the present invention is not limited to the above-described embodiments, and various modifications can be made.

Door closer 10 (first embodiment); first mounting blade 12; first cylinder 14; free end 14-1; connection end 14-2; second mounting blade 16; Free end 18-1; Connection end 18-2; Hinge housing 20; Coil spring 22; Closer mechanism 24; End caps 26 and 28; Inner shaft 34; End 34-2; second engaging recess 34-3; outer shaft 36; first end 36-1; second end 36-2; clutch mechanism 38; first shaft holder 40; fixing ring 42; 44; fixing pin 46; second shaft holder 48; mounting hole 48-1; clutch switching element 50; clutch switching element holding member 52; switching element holding portion 52-1; switching element holding opening 52-2; First engaging recess 54-1
(Second embodiment) door closer 110; door mounting member 112; cylinder 114; door frame fixing member 118; coil spring 122; closer mechanism 124; inner shaft 134; first end 134-1; Portion 134-2; outer shaft 136; first end portion 136-1; second end portion 136-2; clutch mechanism 138; first spring seat 140; pin 144; pin 146; spring set pin 147; Clutch switching element 150; clutch switching element holding member 152; switching element holding opening 152-2; first clutch member 154; first clutch end face 154-1; first engagement recess 154-2; first clutch guide groove 154 -3; second clutch member 156; second clutch end face 156-1; second engagement recess 156-2; second clutch guide 156-3; brake mechanism section 160; Bearing 162
Door closer 210; door attachment member 212; arm link member 213; first arm link 213-1; second arm link 213-2; cylinder 214; door frame fixing member 218; Closer mechanism 224; inner shaft 234; outer shaft 236;
Longitudinal axis C; door D; door frame F; bottom B; slide seat R;

Claims

A cylinder extending along the longitudinal axis;
An inner shaft having first and second ends, extending along the longitudinal axis and rotatably held by the cylinder;
A first end located in the cylinder and a second end fixed so as not to rotate relative to the inner shaft, and an outer side extending outside the inner shaft along the longitudinal axis A shaft,
The cylinder is attached to one of the door and the door frame, the inner shaft is fixed so as not to move relative to the other of the door and the door frame, and the cylinder is opened and closed as the door is opened and closed. A door closer adapted to cause relative rotation with the inner shaft,
The relative rotational position of the cylindrical body and the inner shaft is between an initial rotational position corresponding to a state where the door is closed and a first rotational position corresponding to a state where the door is opened by a predetermined angle. The first end portion of the outer shaft is locked to the cylindrical body, and the door is between the first rotation position and the second rotation position corresponding to the fully open position of the door. A clutch mechanism for releasing the first end of the outer shaft from locking with the cylindrical body and locking the inner shaft with the inner shaft;
When the relative rotation position is between the initial rotation position and the first rotation position, the outer shaft is twisted by the relative rotation generated between the cylindrical body and the inner shaft. The door closer is designed to provide a resilient restoring force for closing the door.
A first cylindrical body comprising the cylindrical body, having a first free end at one end and a first connection end at the other end;
A second cylindrical body having a second free end at one end and a second connection end at the other end and attached to the other of the door and the door frame, the second connection end being the first A second adjacent to the connecting end and aligned with the first cylinder in the direction of the longitudinal axis and connected to the first cylinder so as to be relatively rotatable about the longitudinal axis. A cylindrical body,
The second end portion of the inner shaft is attached to the second cylinder and is fixed to the other of the door and the door frame via the second cylinder. Door closer.
The outer shaft is made of a spring material,
The door closer according to claim 2, wherein the inner shaft is a solid cylindrical shaft made of a rigid member.
The clutch mechanism includes a cylindrical clutch member fixed to the inner peripheral surface of the first cylinder, and an outer periphery of the inner peripheral surface of the clutch member and the inner shaft fixed to the first end of the outer shaft. A clutch switching element holding member extending between the clutch switching element holding member and an opening penetrating the clutch switching element holding member in the radial direction; and a clutch switching element held in the opening; , And
A first engagement recess for receiving a part of the clutch switching element is provided on the inner peripheral surface of the clutch member, and a second engagement for receiving a part of the clutch switching element on the outer peripheral surface of the inner shaft. A recess is provided,
When the relative rotation position is between the initial rotation position and the first rotation position, the clutch switching element is engaged with the first engagement recess and the clutch switching element holding member is When the clutch member is locked and the relative rotation position is between the first rotation position and the second rotation position, the clutch switching element is the first engagement recess of the clutch member. The door closer according to claim 2, wherein the clutch switching element holding member is locked to the inner shaft by engaging with the second engaging recess of the inner shaft without engaging with the inner shaft.
The coil spring further provided around the outer shaft in the first and second cylinders, one end fixed to the first cylinder, and the other end fixed to the second cylinder. Door closer as described in.
A door frame fixing member fixed to the second end of the inner shaft and attached to the door frame;
The door closer according to claim 1, wherein the cylindrical body is attached to a door, and the inner shaft is fixed to the door frame via the door frame fixing member.
The first end of the inner shaft extends beyond the first end of the outer shaft;
The clutch mechanism has a first clutch end surface having a first clutch end surface and fixed to the cylindrical body, and a second clutch end surface facing the first clutch end surface, and the first shaft of the inner shaft. A cylindrical second clutch member fixed to the end, and a clutch switching element holding member fixed to the first end of the outer shaft between the first clutch end surface and the second clutch end surface. A clutch switching element holding member having an opening penetrating the clutch switching element holding member in the direction of the longitudinal axis, and a clutch switching element held in the opening,
The first clutch end surface of the first clutch member is provided with a first engagement recess for receiving a part of the clutch switching element, and the second clutch end surface of the second clutch element is provided with one of the clutch switching elements. A second engaging recess for receiving the portion is provided,
When the relative rotation position is between the initial rotation position and the first rotation position, the clutch switching element is engaged with the first engagement recess and the clutch switching element holding member is The clutch switching element is engaged with the first clutch member when the relative rotation position is between the first rotation position and the second rotation position. 1 engaging recess engages with the second engaging recess of the second clutch member, and the clutch switching element holding member is locked to the second clutch member. The door closer according to claim 6.
The door closer according to claim 7, wherein the clutch switching element has a cylindrical shape with hemispherical ends at both ends.
The door closer according to claim 8, further comprising a coil spring provided around the outer shaft in the cylinder, having one end fixed to the door frame fixing member and the other end fixed to the cylinder.
An arm link member having one end fixed to the door frame fixing member and the other end fixed to the door frame is further provided, and the door frame fixing member is connected to the door frame via the arm member. The door closer according to any one of claims 6 to 9.