KR101758323B1 - Door closer with a braking device - Google Patents

Abstract

The present invention relates to a door closure provided with a braking device, and more particularly, to a door closure having a piston incorporated therein and a pinion interlocked with a rack of a piston to be attached to the door, and a cylinder connected to the pinion of the cylinder, A ratchet wheel is provided at a bottom portion of a connection portion of the operation arm connected to the pinion, and a ratchet wheel is provided at the bottom of the connection portion of the operation arm connected to the pinion And a braking device for interrupting or releasing the rotation of the ratchet wheel is provided on the upper surface of the cylinder to which the operation arm is connected. The operation arm is provided with a ratchet wheel, and the operation arm is rotated in accordance with the degree of opening of the door. The stopper is moved forward to stop the operation arm including the ratchet wheel so that the door can be stopped at a degree of opening the door, so that it is not necessary to use a fixing device such as a conventional door stopper When the door is to be closed again, the opened door is opened at an angle of 90 degrees or more so that the stopper is separated from the ratchet wheel, and the door is closed as a result of operation of the door closure. And when the power switch is turned off with the door fully open, a useful switching effect is provided even in the normal door closing mode of operation.

Description

[0001] Door closer with a braking device [0002]

The present invention relates to a door closer, and more particularly, to a front door or a fire door provided with a door closure, in which the door is closed by opening the door at an angle of 90 degrees or less with respect to the hinge point, When the door is opened and closed at an angle of 90 degrees or more when the door is to be closed, the door is automatically closed by the returning operation to the door closer. And a door closing device provided with a braking device for preventing a safety accident caused by hands on a door that is automatically closed.

Generally, doors such as a doorway door of an apartment building or an entrance door of an office or a fire door of an emergency exit side are provided with a door check (also referred to as a door closer) which slowly closes the door, And is used in connection with the door side.

The door closure accommodates a certain amount of oil in the cylinder and is configured to gradually close the door opened by hydraulic action of the oil circulated in the cylinder according to the forward and backward movement of the piston which is resiliently installed by the spring. -0381570 (name: door closure having a stop mechanism, registered on Apr. 04, 2005, hereinafter referred to as "Patent Document 1") and Patent Document 10-2007-0118729 (titled: Closure, public date: December 18, 2007, hereinafter referred to as "Patent Document 2").

The conventional door closers disclosed in the above-mentioned Patent Documents 1 and 2 are as shown in Figs. 1 to 3.

1 shows a state in which the door closer 100 is installed on the door D and operates. When the door D is opened as shown in FIG. 1, And a pinion 130 installed in the closure 100 and coupled to the operation arm L rotates.

2 is a disassembled perspective view of a door closure 100 according to a related art in which the door closure 100 includes a cylinder 110 having flow paths 111 and sealed front and rear by sealing caps 115a and 115b, A piston 120 installed in the cylinder 110 and a pinion 130 meshing with the rack 122 of the piston 120. The cylinder 120 is coupled to the cylinder 120, And a spring 140 installed between the piston 120 and the piston 120 to generate a restoring force to the piston 120.

Pinion caps 117a and 117b are provided between the cylinder 110 and the pinion 130 to prevent the hydraulic oil from flowing out. In the through hole 124 formed in the piston 120, a check ball 126 for controlling the flow path in one direction is provided to constitute a check valve.

When the door D is opened, the conventional door closer rotates the pinion 130 installed in the cylinder 110 of the door closure 100 by the angle change of the operating arm L, When the pinion 130 rotates, the piston 120 having the rack 122 meshing with the pinion 130 advances to the right, and the spring 140 is compressed.

The operating oil in the entire cylinder chamber 110a in which the spring 140 is installed moves to the rear chamber 110b through the flow passage 111. When the through hole 124 is formed in the piston 120, And a part thereof is moved to the posterior chamber 110b through the through hole 124. [

Therefore, when the through hole 124 is formed in the piston 120, the movement of the hydraulic fluid is smooth during the advance of the piston 120, thereby reducing the resistance generated in the door closure 100 when the door D is opened .

When the external force acting on the door D disappears after the door D is opened at a certain angle, the piston 120 moves to the left as in the initial state due to the restoring force of the compressed spring 140, And the door D is rotated in the closing direction. At this time, even if the through hole 124 is formed in the piston 120, the operation oil can not move to the front chamber 110a through the through hole 124 due to the action of the check ball 126, The resistance of the door closer 100 with respect to the closing direction is greater than the resistance with respect to the opening direction so that the door D is automatically closed by the restoring force of the spring 140. [

In order to fix the door to the door closure acting as described above at a predetermined angle, a separate fixing device normally attached to the door is required. In a typical example thereof, a door for supporting the door from the floor surface The door was closed by the door closer only when a stopper (also called a presser foot) was used and the door was kept open and the door stopper had to be released in order to close the door.

The application of such a door stopper detracts from the beauty of the door and is inconvenient for the user to operate the foot with one foot. Since the shoe is contaminated and the toe portion is mainly used, a wound can be injured when the toe is exposed. And the disadvantage of damaging the upper portion of the shoe is pointed out.

In Patent Documents 1 and 2, it is not easy to change the design of the door closure due to the stop function of the door closure to solve the above-described conventional problems, or to substantially change the door closure due to the application of other components inside the standardized cylinder, Fluid flow due to operation, associated springs and check valves, etc., must be taken into account when designing the door closer so that many modifications and design work must be considered before normal operation, There is an uneconomical disadvantage that the entire cylinder must be replaced even on the surface.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a door or door having a door closure in which a door is opened at an angle of 90 degrees or less with respect to a hinge point, When the door is opened and closed at an angle of 90 degrees or more, the door is automatically closed by the returning operation to the door closure. And a door closing device provided with a braking device for preventing a safety accident caused by hands on a door that is automatically closed.

According to an aspect of the present invention for achieving the above object, there is provided an internal combustion engine comprising: a cylinder having a built-in piston and a pinion interlocked with a rack of a piston, the cylinder being attached to the door; A door closer comprising a link connected to an arm and an operation arm, and a connection bracket connecting and supporting the link to the door frame, wherein a ratchet wheel is provided at the bottom of a connection portion of the operation arm connected to the pinion, The upper surface of the cylinder to which the operation arm is connected is provided with an operation arm operated according to the opening of the door and a braking device for interrupting or releasing the rotation of the ratchet wheel.

The braking device according to the present invention comprises: a main body case mounted on an upper surface of a cylinder as a fastening screw and having a battery mounting part for receiving a battery on an upper surface thereof; A first guide casing fixedly installed in the main body case, having a tunnel-shaped first linear passage formed on an upper surface thereof, a first guide casing having a hooking protrusion formed on one side of the first linear passage, A second linear passage formed in the inside of the first case casing in the body case so as to be in line with the first linear passage from the outside and having a gear guide hole communicating with the inside of the second linear passage, A second guide casing having a guide hole formed therein; A stop member which is guided by a first straight passage of the first guide casing and whose one side passes through the body case to intermittently rotate the operation-arm-side ratchet wheel; A rack gear portion is provided at one side in the longitudinal direction and a plurality of fixing grooves are formed at a side opposite to the side where the rack gear portion is formed, A guide shaft formed at an interval; A drive gear engaged with a rack gear portion of the guide shaft through a gear guide hole of the second guide casing; A drive motor installed outside the main body case for rotating the drive gear in the forward and reverse directions; A shaft fixing member installed on the outer side of the second guide casing to forwardly and reversely move the operation rod through the shaft guide hole of the second linear passage to selectively fix or release the operation rod into the fixing groove of the guide shaft; A first switch installed on the main body case to transfer an operation signal to the driving motor by a pressing action of the side of the operated operating arm when the door is opened at an angle of 90 degrees or more and 90 degrees or more; A second switch provided on the first guide casing side for transferring an operation signal to the shaft fixing member by a pushing action by the backward movement of the stop member; A third switch installed on the body case to transfer an operation signal to the shaft fixing member and the driving motor by a pressing action of the side surface of the operation arm rotated by an operation of closing the door opened to the door frame; A power switch installed on a front surface of the main body case; And a controller for controlling operations of the power switch, the first to third switches, the driving motor, and the shaft fixing member.

The stop member according to the present invention includes a slider which is guided by a first straight passage of a first guide casing and has a connecting portion for connecting to a guide shaft at one side thereof and a stopper and a stopper, A compression spring for elastically supporting the stopper and a pressing piece for pushing the second switch through the slot of the first linear passage at the time of retraction of the slider integrally projecting from the outside of the slider.

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The door closer according to the present invention is provided with a braking device on a cylinder and a ratchet wheel is provided on the operation arm to advance the stopper at the position of the operation arm rotated according to the degree of opening of the door to rotate the operation arm including the ratchet wheel It is not necessary to use a fixing device such as a conventional door stopper in order to have a function of stopping the door at the degree of opening the door by applying the interlocking or releasing structure. When the door is to be closed again, Or more to open the door so that the stopper is spaced apart from the ratchet wheel so as to close the door as an operation of the door closure from this point of time, thereby preventing a safety accident such as a hand striking and turning off the power switch with the door fully opened An advantageous effect is provided that can also be usefully switched to the operating mode of a conventional door closure.

1 is a schematic view showing a state in which a general door closer is connected to a door,
2 is a perspective view showing a door closure of the prior art,
Figure 3 is a cross-sectional view, cut away, of a door closure according to the prior art,
4 is a perspective view showing a state in which a braking device is applied to a door closer according to the present invention,
5 is a schematic diagram showing an operating state of the braking device according to the present invention,
6 is a partial front view showing a door to which a door closer according to the present invention is applied,
FIG. 7 is a cross-sectional view of a braking device according to the present invention,
8 to 10 are plan views showing the action of the braking device according to the opening angle of the door according to the present invention,
Fig. 11 is an enlarged view showing the operating state of the braking device in Fig. 8,
Fig. 12 is an enlarged view showing an operating state of the braking device in Fig. 9,
Fig. 13 is an enlarged view showing an operating state of the braking device in Fig. 10; Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It should be understood that various equivalents and modifications may be present.

The present invention relates to a cylinder assembly including a cylinder 110 having a piston 130 incorporated therein and a pinion 130 engaged with a rack of a piston 120 to be attached to the door and a pinion 130 connected to the pinion 130 of the cylinder 110, And a connecting bracket 150 which connects and supports the link L2 to the door frame D1. The door lock mechanism 100 includes a door lock mechanism (100)

A ratchet wheel W is provided at a bottom of a connecting portion of the operating arm L1 connected to the pinion 130 and a door 110 is formed on the upper surface of the cylinder 110 to which the operating arm L1 is connected, And a braking device 200 for interrupting or releasing the rotation of the ratchet wheel W together with the operation arm L1 operated by the braking device.

The braking device 200 is as shown in FIGS. 4 and 5.

A body case 210 provided with a battery mounting portion 201 for receiving a battery B is mounted on the upper surface of a cylinder 110 constituting a door closer 100 as a fastening screw S,

The main body case 210 is formed with a tunnel-shaped first straight passage 221, a hooking protrusion 222 formed on one side of the first straight passage, and a long hole 223 formed on either side of the both sides. The first guide casing 220 is fixedly installed inside.

A second linear passage 231 is formed in the body case 210 at a position spaced apart from the first guide casing 220 from the outside to form a straight line with the first linear passage 221 And a second guide casing 230 having a gear guide hole 232 and a shaft guide hole 233 communicating with the inside of the second linear passage are provided.

One side of the first linear passage 221 of the first guide casing 220 is connected to a stop member 240 for passing the ratchet wheel W of the operation arm L1 through the body case 210, Respectively.

On the other hand, the stop member 240 extends in a straight line to the rear end of the stop member 240 and is slidably guided by the second straight passage 231 of the second guide casing 230, and has a rack gear portion 251 And a guide shaft 250 having a plurality of fixing grooves 252 and 253 spaced from each other is provided on the opposite side of the rack gear portion.

A drive gear G is engaged with the rack gear portion 251 of the guide shaft 250 through a gear guide hole 232 in the second guide casing 230, And a drive motor M for rotating the drive gear G in forward and reverse directions is provided. That is, the rotation shaft of the driving motor passes through the main body case and the second guide casing 230 and penetrates through the driving gear, and the end of the rotation shaft is rotatably supported on the bottom surface of the second guide casing 230.

The operation rod 261 is advanced and retreated to the outside of the second guide casing 230 through the shaft guide hole 233 of the second rectilinear passage 231 so that the fixing groove 252 of the guide shaft 250 A shaft fixing member 260 for selectively fixing or releasing the shaft fixing member 260 is provided.

The operation signal is transferred to the driving motor M by the pressing action of the side of the rotated operating arm L1 when the opening of the door D is 90 degrees or more and the opening of the door D is 90 degrees or more A first switch 270 is provided.

On the other hand, a second switch 280 for transferring an operation signal to the shaft fixing member 260 is provided on the side of the first guide casing 220 by the pushing action of the stop member 240.

The shaft fixing member 260 and the driving motor M are supported by the main body case 210 by the pressing action of the side surface of the operating arm L1 rotated by the closing operation of the door D on the door frame D1, And a power switch SW is installed on the front surface of the main body case 210. The power switch SW is provided on the front surface of the main body case 210. [

The control unit 300 controls the operations of the first to third switches 270 to 290 including the power switch SW, the driving motor M and the shaft fixing member 260 .

The power switch SW is operated in a state where the door D is opened at 90 degrees or more and 90 degrees or more, that is, when the stopper 243 provided on the stop member 240 is separated from the ratchet wheel W 300 can be turned off and the stopper 243 maintains the state in which the ratchet wheel W is not interrupted, so that the door D can be closed by the general door closer 100. [

The stop member 240 is guided by the first straight passage 221 of the first guide casing 220 and has a slider 242 provided at one side thereof with a connection portion 241 for connection with the guide shaft 250 A stopper 243 which is provided so as to protrude outward from the inside of the slider 242 and a compression spring 244 which resiliently supports the stopper 242 and a slider 242 which is integrally projected on the outer side of the slider 242, And a pushing piece 245 for pushing and acting the second switch 280 through the elongated hole 223 of the first straight line passage 221 in the backward direction. In the compression spring 244, the sharp tip end of the stopper is guided by the valley portion of the gear of the ratchet wheel and is given elasticity along the gear surface in one direction according to the rotation of the ratchet wheel. When the end portion of the stopper is fixed to the valley portion The rotation of the operation arm including the ratchet wheel is stopped.

Hereinafter, the operation of the door closer having the braking device of the present invention will be described.

The door 120 is constructed of the pinion 130 and the actuating arm L1 and the link L2 (not shown in the drawings) In the state in which the door D is opened in accordance with the rotation angle of the door (s).

Accordingly, the main operation parts of the door closure of the prior art are the same, and the names of the components are described in the same manner, so that the door closures of the present invention and the braking device 200 applied to the door closers 100, The operation according to the mutual organic operating relationship will be described.

The door D for the home door or the fire main door to which the door closure 100 is applied is changed by the movement of the operating fluid in the cylinder 110 and the piston 120 in the state of being opened by the door closure, (D) is completely closed by the door frame (D1).

The operating arm L1 connected to the cylinder 110 is connected to the link L2 connected to the door bracket 150 on the door frame D1 in a state in which the door D is opened, As shown in FIG.

Fig. 8 shows the state where the door D is currently closed, Fig. 9 shows the state where the door is opened and stopped, and Fig. 10 shows the state where the door is opened at an angle of 90 degrees.

The operating arm L1 is connected to the pinion 130 in a state where the door D is opened and opened, thereby sliding the piston 120 inside the cylinder. This operation is performed due to the engagement of the pinion 130 in the rack of the piston 120 and the hydraulic oil at this time is moved through the oil passage and operated to compress the spring (not shown) inside the cylinder 110 .

The ratchet wheel W provided on the actuating arm L1 of the present invention is rotated in the same manner as the rotational angle of the actuating arm and the stopper member 240 of the braking device 200 provided on the upper surface of the cylinder 110 Is interfered with the ratchet wheel (W) to allow the ratchet wheel to rotate in one direction, while in the opposite direction, it engages the gear portion of the ratchet wheel.

The stopper member 243 constituting the stopper member 240 passes through the main body case 210 and is brought into close contact with the tip end of the ratchet wheel W so as to be brought into close contact with the tip end of the stopper member 240, 243 are accommodated in the slider 242, the compression spring 244 contacts the gear when the ratchet wheel W rotates, so that the distal end portion of the stopper can be elastically moved over the mountain portion of the gear, Allows one-way rotation.

In such a state, the slider 242 is caught by the engagement protrusion 222 on the first straight passage 221 of the first guide casing 220, the stopper 243 is interfered with the ratchet wheel W, Side end of the stopper 243 to the gear-side crest of the wheel W.

The stopper 243 interfered with the ratchet wheel when the door D is stopped to stop brakes the ratchet wheel W to rotate in the reverse direction so as to stop the door when the door D is opened in the above- .

That is, the door closer 100 is made to be able to keep the operation stop state by the stop member 240. [

In this state, if the user pushes the door D further, even if the door D is opened, the stopper 243 is allowed to rotate the ratchet wheel W, Thereby preventing the operation arm L1 from being released in the reverse direction.

The guide shaft 250 associated with the stop member 240 meshes with the drive gear G in the second straight passage 231 on the side of the second guide casing 230 on the inner side of the main body case 210, The shaft fixing member 260 is guided by the fixing groove 252 of the guide shaft 250 so that the guide shaft 250 advances or conversely stops the backward movement. W are prevented from rotating in the reverse direction, and the door can be maintained in a state in which the door is not closed again at a degree that the door D is opened.

Since the door D is kept stationary, the door D can be stopped and kept open without using a fixing device such as a conventional door stopper (also referred to as a presser foot).

On the other hand, if the user who opens the door opens and closes the door again, the door D is further opened at an angle of 90 degrees or more as shown in Fig.

In this state, the operation arm L1 is rotated with the link L2 on the connection bracket side 150 side at a larger angle and rotated, and the ratchet wheel W is rotated in the reverse direction.

In this operation, the first switch 270 protruding from the main body case 210 contacts the side surface of the rotated operation arm L1 as shown in FIG. 13, The electric signal is transmitted to the rack gear portion 260 by reversing the operating rod 161 of the shaft fixing member 260 through the control portion 300 and then rotating the driving gear G through the rotation shaft of the driving motor M in the reverse direction 215 to move the guide shaft 250 backward.

13, the slider 242 of the stop member 240 moves along the second straight passage 231 of the second guide casing 230 as shown in FIG. 1 straight passage 221 so as to move the stopper 243 away from the ratchet wheel W. [

The pushing piece 245 on the side of the slider 242 in which the stopper 243 is housed is moved along the elongated hole 223 on the side of the first straight line 221 and the pushing piece 245 is moved in the direction of the first guide casing 220, The signal generated by the second switch 280 at the contact point is transmitted to the control unit 300 through the operation of moving the operation rod 261 of the shaft fixing member 260 again Lt; / RTI >

The operating rod 261 of the shaft fixing member 260 is guided to another fixing groove 253 spaced apart from the fixing groove 252 of the guide shaft 250 so that the stop member 240 is rotated by the ratchet wheel W) without interference.

The operation arm L1 and the link L2 at this time are normally operated by the internal configuration of the door closer 100 to open the door The door can be automatically closed.

When the door is completely locked in the door frame D1 by the above operation and the door is locked through the door lock device, the angle between the operation arm L1 and the link L2 is the same as the angle shown in FIG. 8 At this time, as shown in FIG. 11, the side of the returned operation arm L1 contacts the third switch 290 protruded from the main body case 210 by pressing.

The signal transferred through the third switch 290 retracts the operation rod 261 of the shaft fixing member 260 from the fixing groove 253 through the control unit 300 to release the lock, The stopper 243 is retracted to the ratchet wheel W again by advancing the stop member 240 including the guide shaft 250 forward (in the right direction in the figure) It is returned as when the door is opened.

The braking device 200 according to the present invention may be configured such that the power switch SW provided on the front surface of the main body case 210 is in a state in which the door D is fully opened as shown in FIGS. 10 and 13, The stopper 243 maintains the ratchet wheel W in a state in which the ratchet wheel W is not interrupted and can be used as an automatic closing operation mode of the general door closer 100. [

As described above, the present invention has been described with reference to particular embodiments, such as specific elements, and specific embodiments and drawings. However, it should be understood that the present invention is not limited to the above- And various modifications and changes may be made thereto by those skilled in the art to which the present invention pertains.

Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

100: Door Closure 110: Cylinder
120: piston 130: pinion
150: Connection bracket 200: Braking device
210: main body case 220: first guide casing
221: first straight passage 230: second guide casing
231: second straight passage 240: stop member
241: connecting portion 242: slider
243: Stopper 244: Compression spring
245: Pushing piece 250: Guide shaft
251: rack gear portion 252, 253:
260: shaft fixing member 270: first switch
280: second switch 290: third switch
300: Control section D: Door
D1: Door frame G: Driving gear
L1: Working arm L2: Link
M: drive gear SW: power switch

Claims (3)

A cylinder 110 mounted with a pinion 130 having a built-in piston therein and engaging with a rack of the piston 120 and attached to the hinged door D, a door 110 connected to the pinion 130 of the cylinder 110, D and a connecting bracket 150 for connecting and supporting the link L2 to the door frame D1, and a door closing mechanism 100,
A ratchet wheel W is provided at the bottom of a connecting portion of the operating arm L1 connected to the pinion 130 and a door D is mounted on the upper surface of the cylinder 110 to which the operating arm L1 is connected. And a braking device (200) for interrupting or releasing the rotation of the ratchet wheel (W) together with an operation arm (L1)
The braking device (200)
A body case 210 attached to the upper surface of the cylinder 110 as a fastening screw S and having a battery mounting part 201 for receiving the battery B on an upper surface thereof;
The first linear passage 221 is formed on the upper surface of the main body case 210. The first linear passage 221 has a latching protrusion 222 formed on one side thereof, A first guide casing 220 on which the first guide casing 223 is formed;
A second linear passage 231 is formed on the inner side of the first guide casing 220 inside the body case 210 so as to be in line with the first linear passage 221, A second guide casing 230 formed with a gear guide hole 232 and a shaft guide hole 233 communicating with the inside of the two linear passageways;
A stop member 240 which is guided by the first linear passage 221 of the first guide casing 220 and has one side passing through the main body case 210 and interrupting the ratchet wheel W of the operation arm L1; ;
And extends in a straight line to the rear end of the stop member 240 and is slidably guided by the second straight passage 231 of the second guide casing 230 and has a rack gear portion 251 A guide shaft 250 having a plurality of fixing grooves 252 and 253 spaced from each other;
A drive gear G engaged with the rack gear portion 251 of the guide shaft 250 through a gear guide hole 232 of the second guide casing 230;
A driving motor M installed outside the body case 210 to rotate the driving gear G in the forward and reverse directions;
The actuating rod 261 is moved forward and backward through the shaft guide hole 233 of the second linear passage 231 provided on the outer side of the second guide casing 230 so as to be inserted into the fixing groove 252 of the guide shaft 250, A shaft fixing member 260 for selectively fixing or releasing the shaft 253;
An operation signal is provided to the driving motor M by a pressing action of the side of the rotated operating arm L1 when the door D is opened at 90 degrees or more and 90 degrees or more, A first switch 270 for switching on and off;
A second switch 280 provided on the first guide casing 220 side for transferring an operation signal to the shaft fixing member 260 by a pushing action by the backward movement of the stop member 240;
A door member installed in the main body case 210 and transferring an operation signal to the shaft fixing member 260 and the driving motor M by a pushing action of the side surface of the operation arm L1 rotated by the closing operation of the door, 3 switch 290;
A power switch SW installed on a front surface of the main body case 210;
And a control unit 300 for controlling operations of the power switch SW, the first to third switches 270 to 290, the driving motor M and the shaft fixing member 260. [ A door closure with a device.
The method according to claim 1,
The stop member (240)
A slider 242 guided by the first straight passage 221 of the first guide casing 220 and provided at one side thereof with a connection portion 241 for connection to the guide shaft 250,
A stopper 243 provided so as to protrude outward from the inside of the slider 242, a compression spring 244 for elastically supporting the stopper,
And a pushing piece 245 for pushing the second switch 280 through the elongated hole 223 of the first straight passage 221 when the slider is retracted so as to protrude integrally on the outer side of the slider 242 And a braking device for braking the door.
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