JPH0450040Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a closing device for a fire door in the event of a fire.

[Prior art]

Since fire doors are not normally used, they are left open and stopped in a predetermined position. However, in the event of a fire, it is necessary to close automatically without manual intervention to prevent the fire from spreading.

As a closing device for such a fire door, it was developed in 1988.
A device as described in Publication No. 83763 has been disclosed. In this device, when the supply of current to the solenoid is cut off in the event of a fire, the plunger that has been drawn to the solenoid is pushed out by the plunger spring. When this plunger pushes the toggle means, the locking means interlocked with the toggle means is disengaged from the locking hole, and the slider that regulates the movement of the door can freely slide back and forth, and the door is automatically moved by the spring force. It will be closed in 2020. Furthermore, Japanese Patent Laid-Open No. 59-21882 proposes a device in which an elastic body made of a shape memory alloy contracts when heated to release the lock between the stop pin and the locking portion.

[Problems to be solved by this idea]

The problems with the above ideas and inventions are that the configuration is complex, the number of parts is large, the device itself is large, the manufacturing cost is high, and the failure rate is high. .

Therefore, this invention was devised to achieve this purpose with a simple structure.

[Means for solving problems]

The fire door closing device according to this invention has one end of the arm connected to the door closer body attached to the door, the other end of the arm pivotally supported by one end of the link, and the other end of the link fixed to the frame. This is implemented in a door closer that is rotatably supported on a bracket and constantly biases the door in the closing direction.

A locking portion is provided on the upper surface of the end of the link that is attached to the bracket, and a stop pin biased by a spring made of a shape memory alloy is housed in a housing cylinder fixed to the bracket, and the stop pin is held in the locking position. The door can be opened to the required opening degree by being locked to the stop pin, and when heated, the spring formed in the shape memory alloy contracts, releasing the lock between the stop pin and the locking part, and opening the door closer. The fire door is configured to be closed by the biasing force.

〔Example〕

This invention will be explained in detail below based on an embodiment shown in the drawings.

In the figure, 1 is a door closer that applies a biasing force to the fire door 2 in the closing direction, and includes a door closer body 3, an arm 4, a link 5, and a bracket 6.
It consists of The door closer body 3 is fixed to the upper part of the fire door 2, and is configured to horizontally rotate the arm 4 by applying a biasing force in the closing direction to the arm 4 using a spring. One end of a link 5 is supported by a pin at the end of the arm 4, so that both can rotate horizontally. The other end of the link 5 is rotatably attached to a bracket 6. One end of the bracket 6 protrudes beyond the expected width of the window frame, and a screw 8 is fixed to the lower surface of the upper frame 7.

The upper surface of the end 9 of the link 5 on the side to be attached to the bracket 6 is formed into a disk shape, and a bolt insertion hole 10 is bored in the center of the end 9. A disk-shaped locking plate 11 is placed on the end portion 9 . A bolt insertion hole 12 is provided at the center of the locking plate 11.
An elongated hole 13 is formed on the outer periphery of the bolt insertion hole 12 and has a circular arc with a radius r centered around the bolt insertion hole 12. A circular hole-shaped locking portion 14 is bored at a distance of R.

A nut fitting hole 15 is bored in the end of the bracket 6 that protrudes from the window frame, and the length from the center of the nut fitting hole 15 to the bolt of the locking plate 11 and the insertion hole 12 to the locking part 14 is A pin protrusion hole 16 is formed at a distance r equal to the distance r. A cylindrical housing cylinder 17 whose upper end is closed is fixed directly above the pin protruding hole 16 of the bracket 6, and a stop pin 19 biased downward by a spring 18 is housed in the housing cylinder 17. has been done. Stop pin 1
9 can protrude downward from the pin protrusion hole 16. The lower end of the stop pin 19 is formed into a spherical shape. The spring 18 is made of a shape memory alloy and is stored when heated to a predetermined temperature or higher. A heating body 24 is placed so as to cover the outer periphery of the upper half of the storage tube 17, and the heating body 24
A hot wire 20 is wired inside.

Each bolt insertion hole 1 of the link 5 and the locking plate 11
0 and 12, a bolt 21 is inserted from the lower surface of the link 5, and in the nut fitting hole 15 of the bracket 6, a nut 22 is formed with an overhanging portion 23 having a diameter larger than the lower part on the upper outer periphery. The lower part is fitted from above. The bolt 21 as described above is screwed into the nut 22, and the link 5 is connected to the bracket 6.
The link 5 is rotatable around a bolt 21 and a nut 22.

The operating state of the fire door closing device having the above configuration will be explained.

When the fire door 2 is opened and stopped at a predetermined position, the bolts 21 and nuts 22 are slightly loosened so that the locking plate 11 can freely rotate around the bolt 21, and the tip of the stop pin 19 is held in place by the locking plate 11. It is locked in the locking part 14 of.

When the fire door 2 is opened in this state, the end 9 of the link 5 also rotates around the bolt 21 and nut 22, but by tightening the bolt 21 and nut 22 at a predetermined position, the locking plate 11 is connected to the lower surface of the nut 22 and the link 5.
It is clamped by the end 9 of the holder and fixed so that it does not rotate. At this time, the tip of the stop pin 19 is locked in the locking portion 14 of the locking plate 11, so when the rotation of the locking plate 11 is blocked, the rotation of the link 5 is blocked by the pin 19. The fire door 2 will stop at a predetermined position.

When the fire door 2 is closed manually, the tip of the stop pin 19 is formed into a spherical shape.
The force pushing the door 2 rotates the door 2 about the hinge, and the stop pin 19 rides on the outer periphery of the locking portion 14 against the biasing force of the spring 18. When the door 2 is rotated as it is, the stop pin 19 fits into the elongated hole 13, becomes freely rotatable, and is closed by the biasing force of the door closer 1.

In the event of a fire, a sensor detects heat, smoke, etc., and electricity is applied to the hot wire 20 in the heating body 24 to heat it. The spring 18 inside the storage tube 17 is made of a shape memory alloy and contracts due to heat. Therefore, the biasing force of the spring 18 no longer acts on the stop pin 19, and the stop pin 19 and the locking portion 1
4 is released, and the fire door 2 is closed by the urging force of the door closer 1.

When the spring 18 is contracted, the stop pin 1
9 still protrudes into the locking portion 14, but as the locking becomes shallower, the stop pin 19 can no longer resist the biasing force of the door closer 1, and the stop pin 19 comes off from the locking portion 14.

Also, even if the sensor does not detect it, the fire will heat up the bracket itself, causing the spring to contract and close the fire door.

This invention has the above-mentioned configuration, and the locking portion 14 may be provided at the end 9 of the link 5 by attaching it to a separate locking plate 11 as in the above embodiment. A recessed locking portion 14 into which the stop pin 19 can be locked on the upper surface of the end 9 of the link 5 and an arcuate long groove in which the tip of the stop pin 19 can be moved may be provided on the outer periphery of the bolt insertion hole 10.

[Effect of idea]

The fire door closing device according to this invention has a locking part on the upper surface of the end of the link of the door closer that is attached to the bracket, and a spring made of shape memory alloy inside a storage cylinder fixed to the bracket. Since the biased stop pin is housed, the stop pin and spring expand and contract smoothly, and assembly is easy. In addition, the spring made of the shape memory alloy contracts when heated, releasing the lock between the stop pin and the locking part, and the fire door is automatically closed by the biasing force of the door closer, reducing the number of parts. The device can be installed simply by using a door closer, and the device itself is small and has a simple structure, resulting in low manufacturing costs.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an embodiment of a fire door closing device according to this invention, FIG. 2 is a perspective view of a door closer implementing this invention, and FIG. 3 is a plan view of a locking plate. 1...Door closer, 2...Fire door, 3...
Door closer body, 4... Arm, 5... Link, 6... Bracket, 9... End, 10... Bolt insertion hole, 11... Locking plate, 12... Bolt insertion hole, 13... Length Hole, 14... Locking part, 15...
Nut fitting hole, 16... pin protrusion hole, 17... storage tube, 18... spring, 19... stop pin, 20... hot wire, 21... bolt, 22... nut.

Claims (1)

[Scope of utility model registration request] One end of an arm 4 is connected to a door closer body 3 attached to a fire door 2, the other end of the arm 4 is pivoted to one end of a link 5, and the other end of the link 5 is attached to a bracket 6 fixed to a frame 7. A locking part 14 is provided on the upper surface of the end of the link 5 on the side to be attached to the bracket 6 of the door closer 1 which is rotatably supported and always biases the door 2 in the closing direction, and is fixed to the bracket 6. A stop pin 19 biased by a spring 18 made of a shape memory alloy is housed in the storage tube 17, and the stop pin 19 is locked to the locking portion 14 to enable the door 2 to be opened to a required opening degree. The spring 18 made of the shape memory alloy contracts when heated, the stop pin 19 and the locking portion 14 are unlocked, and the fire door 2 is closed by the biasing force of the door closer 1. A fire door closing device characterized by: