WO2016103309A1

WO2016103309A1 - Door closer

Info

Publication number: WO2016103309A1
Application number: PCT/JP2014/006513
Authority: WO
Inventors: 田口　吉徳
Original assignee: 株式会社久力製作所
Priority date: 2014-12-26
Filing date: 2014-12-26
Publication date: 2016-06-30

Abstract

[Problem] To provide a closer provided on a hinged door that reliably stops a door without entrapping a finger even when the door is closed with force. [Solution] A door closer wherein a retraction chamber is provided at the intersection of an insertion groove and a lock groove of a guidance groove in a closing guidance plate, and a buffering gate comprising an elastic body to bias a gate bar from the rear side toward the guidance groove by a prescribed biasing means is disposed in the entrance to the retraction chamber. If the pressing force when an engaging projection inserted into the guidance groove is in contact with the gate bar of the buffering gate exceeds the biasing force applied to the gate bar, the gate bar and the engaging projection are pushed into the retraction chamber and the engaging projection is temporarily blocked from penetrating into the lock groove. When the pressing force of the engaging projection is absorbed, the engaging projecting enters into the lock groove by being pushed back by the biasing force of the elastic body.

Description

Door closer

The present invention relates to a door closer, and more particularly, to a door closer for automatically and smoothly performing a closing portion when a hinged door is manually closed.

For example, Japanese Patent Application Laid-Open No. 2010-2010 discloses a device that automatically performs the operation of the end portion (near the fully closed position) when manually closing the hinged door and reduces the impact when the door (door) hits the door frame. As described in Japanese Patent No. 236186, a door closer provided with a biasing means for biasing the swing arm and the door body in the closing direction and a buffering means for buffering the momentum in the closing direction is well known (FIG. 6). reference).

By providing such a door closer on the door type door, it is possible to prevent the door from being left open or the door body from hitting the door frame without having to close it carefully until the end. Can be closed automatically. However, even with a hinged door installed with such a door closer, if the force of closing the hinged door of the user exceeds the assumption of the installer, sufficient force cannot be buffered. Furthermore, it may lead to injuries such as pinching fingers.

As a means for preventing such an injury, a method of adjusting a biasing means of a coil spring or a damper built in the door closer can be considered. However, if the assumed closing force is set strongly, the door is completely The biasing means composed of a coil spring and the damper as the buffering means continue to act strongly from the fully open state to the fully closed state, so that the normal door opening / closing operation is relatively large. There is a problem that requires power and sacrifices the operability.

JP 2010-236186 A

The present invention is intended to solve the above-described problems. For the closer provided in the hinged door, the amount of protrusion of the device in the door opening space is minimized, and a smooth door opening / closing operation is performed. Even when the door is strongly closed in the maintained state, it is an object to prevent the finger from being pinched by reliably stopping the door.

Therefore, the present invention includes an arm having an engagement convex portion on the distal end side, an urging means connected to the arm proximal end side to turn the arm distal end side, and a tethering means for fixing the arm at a predetermined angle. The main body disposed on the door body of the hinged door and the engaging convex portion enter and engage to guide the sliding direction of the engaging convex portion with respect to the turning operation by the biasing means. The plane formed by the insertion groove and the locking groove for operating the door body in the closing direction is formed by a closing guide plate provided with a horizontally long substantially L-shaped guide groove on the lower surface, The door is automatically moved to the fully closed position by releasing the anchoring means and moving the engaging projection from the insertion groove of the guide groove to the locking groove while turning the arm by the biasing means. To the door closer of the hinged door arranged on the door. In addition, a retracting chamber is provided at the intersection between the insertion groove and the locking groove of the guide groove in the closing guide plate, and a gate bar is inserted into the entrance of the retracting chamber from the rear side by a predetermined biasing means in the guide groove direction. A buffer gate having an elastic body that biases toward the guide groove is disposed, and the pressing force when the engagement convex portion that has entered the guide groove abuts on the gate bar of the buffer gate exceeds the biasing force associated with the gate bar The gate bar and the engaging convex portion are pushed in the direction of the retracting chamber and the engagement convex portion is temporarily prevented from entering the locking groove, and the pressing force of the engaging convex portion is absorbed. Then, it is provided with the buffer gate that is pushed back by the urging force of the elastic body to cause the locking convex portion to enter the locking groove, and a sufficient buffering action can be obtained by using a coil spring as the elastic body. Is obtained.

In addition, when the gate bar is pushed toward the retracting chamber by the engaging convex portion, the wall surface in the retracting chamber with which the engaging convex portion abuts is made of an elastic body, thereby ensuring the engagement. The mating convex portion can be stopped and the engagement convex portion can be prevented from being damaged from a collision.

Further, a bypass inclined surface is provided in the vicinity of the open end of the guide groove provided in the closing guide plate, and an elastic body is disposed below the bypass inclined surface, so that the engagement convex portion of the arm is opened. Even when the guide groove does not enter / engage from the end, the engaging convex portion can pass through the bypass inclined surface while immersing the engaging convex portion into the locking groove in the guide groove. In this case, not only can the mounting accuracy be high, but a sufficient function can be achieved, and by providing the above mechanism, the arm can move before the arm's engaging projection enters the guide groove for some reason. Even in the case of turning, the arm can be automatically restored, so that the function as a door closer can be sufficiently exhibited without removing the door.

Installed by disposing a retracting chamber at the intersection of the insertion groove and the locking groove of the guide groove in the closing guide plate, and installing a buffer gate capable of buffering the pressing force of the engaging convex part at the inlet part Even when the door is closed with a pressing force that is not assumed by the user, the pressing force can be buffered and absorbed once before the door is closed. It is possible to reliably prevent an accident such as a finger being caught in the door.

According to the embodiment of the present invention, the upper side of the door frame is described from the lower side for explaining the configuration and operation of the door closer in which the door frame embedded type closing guide plate is combined with the conventional externally mounted main body. Schematic view of the bottom as seen. It is explanatory drawing of the finger pinching prevention mechanism based on embodiment of this invention, Comprising: (A) is operation | movement with an engagement convex part and gate when the pressing force which a door closes exceeds the urging | biasing force of a coil spring FIG. 4B is an operation diagram of the engagement convex portion and the gate when the pressing force for closing the door is less than the biasing force of the coil spring. It is the figure which showed the bypass inclined surface of the guide plate for closure based on embodiment of this invention, (A) is a plane schematic diagram of the guide plate for closure, (B) is the XX direction of a bypass inclined surface. Sectional drawing. The (A) top view and (B) sectional view in the main part of the door embedding type which are other embodiments of the present invention. The upper side of the door frame for explaining the structure and operation of the door closer according to the embodiment shown in FIG. Schematic view of the bottom as seen. The bottom face schematic diagram which looked at the upper side of the door frame from the lower side for demonstrating the structure and operation | movement of the main body and closing guide plate of the conventional door door closer shown by patent document 1. As shown in FIG. It is a figure which shows the main body of the conventional hinged door closer shown by patent document 1, (A) is a top view of a door closer main body, (B) is a rear view of (A), (C) is X of (A). Sectional view when the casing of the main body is cut along the X-ray. The horizontal cross-sectional view in the attachment state for demonstrating the mechanism in which the main body of the conventional hinged door closer shown by patent document 1 operate | moves. The principal part sectional drawing which shows the engaging convex part of the arm in the main body of the conventional hinged door closer shown by patent document 1. FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

FIG. 1 shows a state (bottom view) of a door frame 5 (upper side portion) viewed from below for explaining the configuration and operation of the door closer 1 according to the embodiment of the present invention. The door closer 1 is composed of a main body 2 attached to the upper front side of the door body 4 and a closing guide plate 3 attached to the lower side of the upper side of the door frame 5, and only in a predetermined range before and after the fully closed position of the hinged door. A state in which the arm 21 extending from the main body 2 is engaged with the guide groove 31 of the closing guide plate 3 by the engagement convex portion 21a on the distal end side to urge the door 4 in the closing direction and the engagement is released. Then, the door 4 can be opened and closed freely.

When the closing guide plate 3 of the door closer 1 according to the present invention is compared with the conventional door closer 1 described in Patent Document 1 described above, the closing guide plate 3 has a predetermined L-shaped plane. Is common in that the door 4 is urged in the closing direction while guiding the engaging protrusion 21a by the guide groove 31 having the length of When the pressure by which 21a pushes the gate bar 35a of the buffer gate 35 exceeds the urging force of the coil spring 37, the gate bar 35a of the buffer gate 35 is pushed into the retracting chamber 38, and the shock buffering wall of the retracting chamber 38 It differs from the door closer 1 of patent document 1 by the point which provided the mechanism which stops the momentum of a door when the said engaging convex part 21a collides with the elastic body 36 in a part.

As for the structure of the main body 2 used in the embodiment of FIG. 1, as shown in FIGS. 7 and 8, a conventionally known structure similar to that shown in Patent Document 1 can be used. The structure will be described below.

7A is a plan view of the door closer body of FIG. 1, FIG. 7B is a rear view of FIG. 7A, and FIG. 7C is an XX of FIG. 7A. FIGS. 8A and 8B are cross-sectional views when the casing of the main body is cut along a line, and FIGS. 8A and 8B are horizontal crossings in an installed state for explaining a mechanism in which the main body of FIG. FIG.

As shown in FIGS. 7A and 7B, the main body 2 includes an arm 21 and a mechanism portion 20 having a mechanism for operating the arm 21, and the arm 21 is provided on the top surface on the distal end side. It has an engaging convex portion 21a made of a pin-like member protruding upward from the mounting hole, and on its proximal end side, a mechanism for urging the distal end side in the turning direction as described later, a mechanism for buffering this, A mechanism for anchoring and fixing the arm 21 at a predetermined angle is provided.

As shown in FIG. 7C, the main body 2 is in a state in which the proximal end side of the arm 21 is pivotally supported by a shaft 26 in the casing 22 of the mechanism portion 20, and a coil spring 231 that is a biasing means is provided inside. An operating body 23 made of a rectangular parallelepiped member having a damper 232 serving as a buffer means is provided, and the distal end side of the arm 21 connected to the base end side of the operating body 23 is turned by the operation of the operating body 23.

That is, a hook-like slide part 23 b is inserted from the opening end side of the hook-shaped base part 23 a constituting the operating body 23, and the slide part 23 b is opened by the operation of the coil spring 231 and the damper 232. It slides so as to protrude and immerse from the end, and the base end side of the arm 21 is connected to the distal end side of the slide portion 23b to form a lever structure in relation to the shaft 26.

Referring to FIG. 8A showing a cross-sectional view of the state in which the main body 2 is attached to the door body 4, a casing 22 that is an outer box of the mechanism portion 20 in the main body 2 is an abbreviation that incorporates an operating body 23. It consists of a plate-like portion and a block-like portion in which the base end side of the arm 21 having a height higher than this is inserted through a slit. It is attached to the front upper part.

Then, on the side where the proximal end side of the arm 21 is inserted, the slide portion 23b of the operating body 23 is engaged with a convex portion 251 provided on the top surface of the distal end side at a position where the slide portion 23b protrudes, and the slide portion 23b is anchored. A hook member 25 is provided as a tethering means, and is connected (engaged) to the slit 236 of the slide portion 23b by a convex portion 21c provided at a position corresponding to the power point of the lever structure on the proximal end side of the arm 21. The pulling force of the coil spring 231 acts on the arm 21, and the angle of the arm 21 with respect to the surface of the door body 4 is fixed against the pulling force of the coil spring 231 by the anchoring action of the flange member 25.

Then, by the door closing operation, the engaging convex portion 21a of the arm 21 enters the guide groove 31 of the closing guide plate 3 and is guided, and the tip end side of the arm 21 is turned in the closing direction, thereby sliding with the flange member 25. The engagement of the portion 23b with the convex portion 251 is released, and the slide portion 23b is operated in the direction of immersing into the base portion 23a by the traction force due to the elastic repulsion of the coil spring 231 that is the urging means. The arm 21 to which the end side is connected turns so as to fall toward the door plate 4.

FIG. 2 is a schematic diagram illustrating details of the shock absorbing mechanism in the closing guide plate 3 of the door closer 1. FIG. 2A is a case where the pressing force for closing the door exceeds the urging force of the coil spring 37. FIG. 2B shows a case where the pressing force for closing the door is less than the urging force of the coil spring 37.

The closing guide plate 3 according to the embodiment of the present invention includes the retracting chamber 38 at the intersection of the insertion groove 31b and the locking groove 31c in the substantially L-shaped guide groove 31. The buffer gate 35 provided at the entrance is always biased by the coil spring 37 from the retracting chamber 38 toward the guide groove 31, that is, in the direction of closing the retracting chamber 38 by the gate bar 35 a.

First, referring to FIG. 2A, (1) shows that the engagement convex portion 21 a of the arm 21 in the main body 2 of the door closer 1 is closed to the open end 31 a of the guide groove 31 of the closing guide plate 3. The case where the pressing force of the engaging convex portion 21a that has entered exceeds the biasing force of the coil spring 37 is shown.

In this case, as shown in (2), the engaging convex portion 21a enters the insertion groove 31b and collides with the gate bar 35a with the momentum of closing the door. Since the pressing force of the gate bar 35a of the engaging convex portion 21a at this time exceeds the urging force of the coil spring 37, the buffer gate 35 rotates in the direction of the retracting chamber 38 and pushes down the gate bar 35a as shown in the figure. .

When the gate bar 35a of the buffer gate 35 is pushed down, the engaging convex portion 21a enters the retracting chamber 38 and elastic body 36 provided on the wall of the retracting chamber 38 (in this embodiment, rubber is used). It stops when it collides with the door, and temporarily suppresses the momentum of closing the door. Thereafter, as shown in (3), when the pressing force is absorbed and the urging force of the coil spring 37 starts to work stronger than the pressing force, the gate bar 35a returns to the original state and the engagement convex portion 21a is formed in the guide groove. It is pushed back into the locking groove 31c at 31.

The arm 21 is operated by an automatic closing mechanism (mechanism 20) built in the main body 2 due to an impact between the engaging convex portion 21a and the gate bar 35a or a movement of the arm 21 by a predetermined angle due to a door closing operation. At the same time, when the engaging convex portion 21a returns to the locking groove 31c in the guide groove 31, the arm 21 slightly falls in the closing direction while engaging the locking groove 31c, so that the door body 4 falls. The door is automatically closed by urging the door in the closing direction.

On the other hand, when the pressing force for closing the door is lower than the urging force of the coil spring 37, the engaging convex portion 21a of the arm 21 is inserted into the closing guide plate 3 as shown in FIG. The guide groove 31 passes through the insertion groove 31b and comes into contact with the gate bar 35a. However, as shown in (2), the pressing force of the engaging convex portion 21a does not exceed the urging force of the coil spring 37 to the gate bar 35a. Will never go down.

Therefore, while the engaging convex portion 21a engages with the guide groove 31, the plane of the guide groove 31 passes through a curved portion having a predetermined length of a substantially L shape, and the arm 21 slightly falls in the closing direction. As a result, the automatic closing mechanism (mechanism part 20) built in the main body 2 starts to operate, and the door 4 is urged in the closing direction to automatically close the door.

In the embodiment of the present invention, the strength of the rotation of the gate bar 35a can be adjusted by an adjustment screw (not shown) provided on the opposite side of the coil spring 37 from the buffer gate 35 side.

Since the strength of the coil spring 37 can be adjusted by the adjusting screw (not shown), it is possible to vary and use the biasing force related to the gate bar 35a that opposes the pressing force of the engaging convex portion 21a. It can be adjusted as appropriate according to the weight of the door and the situation of the user's door operation.

In the embodiment of the present invention, it is possible to substantially fix the gate bar 35a by maximizing the biasing force of the coil spring 37. By adjusting in this way, the door is halfway every time when the door is closed. It is possible to use a more natural door operation that does not take a long time to stop.

Next, the function of the bypass inclined surface 34 provided on the closing guide plate 3 in the door closer 1 of the present embodiment will be described with reference to FIG.

Depending on the closing operation of the door, the engagement convex portion 21a of the arm 21 of the main body 2 may not enter the open end 31a of the guide groove 31 provided in the closing guide plate 3, or some impact may be applied to the arm 21 from the outside. It is conceivable that the arm 21 starts to turn and the arm 21 enters the door 4 side. In this case, by providing the bypass inclined surface 34 connected from the side surface to the lower surface at a position close to the terminal end portion of the guide groove 31, the peripheral surface of the engaging convex portion 21a slides on the side surface of the closing guide plate 3, The engaging convex portion 21 a enters the adjacent bypass inclined surface 34, and a return path for returning the engaging convex portion 21 a to the locking groove 31 c of the guide groove 31 is provided.

The return path is also provided in Patent Document 1, and its structure slides on the bypass inclined surface 34 while immersing the distal end side of the pin-like member of the engaging convex portion 21 a to the lower surface of the closing guide plate 3. After reaching, the engaging projection 21a enters and engages with the guide groove 31. In this configuration, a coil spring is built in the engaging projection of the arm 21 (see FIG. 9). ), The entire engaging convex portion 21a of the arm 21 becomes large, and the closing guide plate 3 on the side receiving the engaging convex portion 21a also needs to be enlarged, thereby reducing the size of the door closer. It was hindering.

Therefore, in the present embodiment, as shown in FIG. 3B, by incorporating a coil spring 39 on the upper side of the bypass inclined surface 34, when the engaging convex portion 21a comes into contact with the bypass inclined surface 34, the engagement is increased. The engaging convex portion 21a pushes the bypass inclined surface 34 so as to be immersed therein, so that the engaging convex portion 21a can be returned to the locking groove 31c of the guide groove 31 over the bypass inclined surface 34.

Further, by providing the closing guide plate 3 with the bypass inclined surface 34 having the coil spring 39 built in, the mounting accuracy of the closing guide plate 3 and the main body 2 is not very high, or the positional relationship between them depends on use. Even if the shift occurs, the door closer 1 can sufficiently perform its function.

When the coil spring 39 is built in the upper side of the bypass inclined surface 34, the coil spring 210 is built in the engagement convex portion 21a of the conventional arm 21 as in Patent Document 1 (see FIG. 9). Since the engagement convex portion 21a can be designed more compactly compared to the above, the thickness of the closing guide plate 3 for allowing the engagement convex portion 21a to enter can be reduced, and the door frame 5 is closed and guided. Not only the notch required for installing the plate 3 is required, but also the door can be installed using the existing core as it is.

Next, the main body 2 in the door closer 1 in the embodiment shown in FIG. 4 will be described.

4A shows a plan view of the main body 2, and FIG. 4B shows a cross-sectional view in which the internal structure is exposed by cutting the casing 22 of the main body 2 of FIG. 4A.

As shown in FIG. 4, the main body 2 includes an arm 21 and a mechanism portion 20 having a mechanism for operating the arm 21, and the arm 21 protrudes upward from a mounting hole provided on the upper surface on the distal end side. An engaging convex portion 21a made of a roller-like member is provided, and a mechanism for urging the distal end side in a turning direction as described later, a mechanism for buffering this, and an arm 21 at a predetermined angle. Mechanisms for tethering and fixing are respectively arranged.

Specifically, in the main body 2, the base end side of the arm 21 is pivotally supported by a shaft 26 at a substantially central portion in the longitudinal direction of the mechanism portion 20, and an urging force incorporated in the casing 22 on one side across the arm 21. A coil spring 231 as a means, and a damper 232 as a buffer means at a position immediately above the arm 21 across the arm 21 so that the tip 232a of the damper 232 on the arm 21 side and the shaft 26 of the arm 21 are in contact with each other. Touching. In addition, one end of the power transmission piece 241 for transmitting the urging force of the coil spring 231 to the arm 21 is connected to the casing 22, and the other end of the power transmission piece 241 is connected to the arm fixing piece 242 so that the arm The urging force is transmitted to 21.

Here, in addition to the role of transmitting the urging force of the coil spring 231 to the arm 21, the arm fixing piece 242 causes the arm 21 to rotate counterclockwise as viewed from the direction of FIG. The role of preventing the arm 21 from rotating and the urging force transmitted from the power transmission piece 241 to the arm fixing piece 242 when the arm 21 is positioned at approximately 90 degrees with respect to the longitudinal direction of the main body 2. The arm 21 is locked in a state protruding from the side surface of the main body by being transmitted to the square shaft 26 of the arm 21 at a predetermined angle.

As shown in FIG. 5 (A), when the door 4 is moved in the closing direction with the arm 21 protruding, the engagement convex portion 21a at the tip of the arm 21 is the open end of the closing guide plate 3. The arm 21 is rotated by the impact that has come into contact with 31a, and the engagement between the power transmission piece 241 and the arm fixing piece 242 is released.

When the locking is released, a force in the clockwise direction acts on the arm 21 by the urging force of the coil spring 231, so that the engagement convex portion 21 a at the tip of the arm 21 is formed as shown in FIG. The door 4 is automatically moved in the closing direction of the door frame 5 while moving the guide groove 31 as shown in FIG.

The rotational speed of the arm 21 at this time is adjusted by the buffering action of the damper 232 disposed to face the coil spring 231. Of course, when the closing force of the door 4 is strong, the engaging convex portion 21a that has entered the guide groove 31 of the closing guide plate 3 pushes the buffer gate 35 shown in FIG. The momentum is then adjusted in advance.
Note that the force for urging the door 4 in the closing direction continues to act even in the fully closed position of FIG.

Furthermore, the door closer 1 of the present embodiment is such that the engagement convex portion 21a of the arm 21 is guided by a guide groove 31 provided in a predetermined shape and length on the lower surface of the closing guide plate 3. The guide groove 31 is configured so that the vicinity of the opening end 31a substantially coincides with the intrusion angle of the engaging convex portion 21a, and thereafter guides laterally with respect to the intruding angle after being curved. The biasing force in the closing direction of the door body 4 changes in an inclined manner depending on the relationship between the angle of the arm 21 and the distance from the hinge portion (not shown) of the door body 4.

That is, the urging force in the closing direction of the door 4 by the arm 21 is the most necessary for the automatic operating force by the door closer 1 since the manual force is weakened after the anchoring means is released by the manual closing operation. The interrelationships are set so as to be strongest in the range and slightly weaker in the vicinity of the door fully closed position.

In the door closer 1 of the present invention, at the beginning of opening the door, the door 4 starts to open even with a relatively small force, and the portion with strong urging force can be easily opened by the acceleration force. Too much momentum and manual door opening and closing can be performed very smoothly. The adjustment of the urging force applied to the door body 4 is appropriately performed by designing the length of the guide groove formed in the lower surface of the closing guide plate 3 according to the length of the arm 21 and the shape of the guide direction. be able to.

By configuring the door closer 1 according to the present embodiment, the main body 2 can be accommodated within 20 mm to 30 mm from the upper part of the door, which is the thickness of the core material of a general door. Because the existing core material can be used, there is no need for processing to reinforce the core material, and it is necessary to provide the door body 4 with a large notch that was conventionally required when installing this type of door closer. In addition, when the door is completed, it is possible to provide a clean door in which the door closer 1 hardly protrudes from the outside. Moreover, since the main body 2 in the embodiment of the present invention can be switched between the right hand and the left hand by removing the shaft 26 of the arm 21 and assembling from the opposite side of the upper and lower surfaces of the main body, the arm 21 is assembled. It is possible to easily store the right hand and the left hand on the main body 2 in accordance with the order status and the stock status.

1 door closer, 2 body, 20 mechanism part, 21 arm, 21a engagement convex part, 22 casing, 23 actuating body, 23a base part, 23b slide part, 26 axis, 3 closing guide plate, 31 guide groove, 31a open end , 31b insertion groove, 31c locking groove, 34 bypass inclined surface, 35 buffer gate, 35a gate bar, 36 elastic body, 37 coil spring, 38 retraction chamber, 39 coil spring, 4 door body, 5 door frame, 231 coil spring, 232 damper, 232a damper tip, 241 power transmission piece, 242 arm fixing piece

Claims

An arm having an engaging projection on the distal end side, an urging means connected to the proximal end side of the arm and pivoting the distal end side of the arm, and a tethering means for fixing the arm at a predetermined angle. The main body disposed in the door body and the engaging convex portion enter and engage to guide the sliding direction of the engaging convex portion with respect to the turning operation by the biasing means and close the door body. The flat surface formed by intersecting the insertion groove and the locking groove for operating in the direction comprises a guide plate for closing provided with a horizontally elongated guide groove on the lower surface, and the anchoring means is released. The door in which the door is automatically moved to the fully closed position by moving the engagement convex portion from the insertion groove of the guide groove to the locking groove while turning the arm by the biasing means. In the door closer of the hinged door arranged in
A retracting chamber is provided at the intersection of the insertion groove and the locking groove of the guide groove in the closing guide plate, and a gate bar is provided at the entrance of the retracting chamber from the rear side by a predetermined biasing means. A buffer gate having an elastic body that biases in the direction is disposed, and the pressing force when the engaging convex portion that has entered the guide groove comes into contact with the gate bar of the buffer gate generates a biasing force related to the gate bar. When it exceeds, the gate bar and the engaging convex portion are pushed in the direction of the retracting chamber and the engagement convex portion is temporarily prevented from entering the locking groove, and the pressing force of the engaging convex portion is reduced. The door closer comprising the buffer gate that is pushed back by the urging force of the elastic body when absorbed to allow the locking projection to enter the locking groove.
The door closer according to claim 1, wherein a coil spring is used as the elastic body.
The wall surface in the retracting chamber with which the engaging convex portion abuts when the gate bar is pushed in the retracting chamber direction by the engaging convex portion is constituted by an elastic body. The door closer according to 2.
The door closer according to claim 3, wherein the elastic body disposed on the wall surface is a rubber body.
The door closer according to claim 1, 2, 3 or 4, wherein the closing guide plate can be built in a door frame and does not require a notch during installation.
By providing a bypass inclined surface in the vicinity of the open end of the guide groove provided in the closing guide plate, and disposing an elastic body above the bypass inclined surface, the engagement convex portion of the arm is opened. Even when the arm pivots before entering and engaging the end, and is positioned substantially parallel to the door, and the engaging convex portion does not enter the guide groove, the engaging convex portion is the bypass. The door closer according to claim 1, 2, 3, 4 or 5, wherein the engaging convex portion can enter the locking groove in the guide groove by overcoming the inclined surface while immersing it. .
The door closer according to claim 6, wherein the elastic body provided above the bypass inclined surface is a coil spring.