JPH0331862B2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Purpose of the Invention The present invention relates to a door lock, and particularly to an unlocking device for the door lock that can be automatically unlocked in the event of a fire.

(Prior art and problems to be solved) Conventionally, this type of lock attached to the door of a room has been constructed so that it cannot be unlocked from outside after being locked from inside the room. As is well known, this configuration has the drawback that if the lock cannot be unlocked from inside the room due to an unexpected fire, the locking device and door must be destroyed.

The present invention was made in order to cope with the current situation, and an object of the present invention is to provide a lock unlocking device that automatically unlocks in the event of a fire, allowing the door to be opened and closed freely. It is something.

(2) Structure of the invention (technical means for solving the problem and its operation) In order to achieve the above object, the present invention provides a locking bolt unlocking device, which uses a bolt that protrudes and retracts from the front plate of the lock to perform locking and unlocking. and a plate integrally formed with the bolt, a hub that engages with and rotates with an operating rod that rotates by external operation, and a hub that is integrally formed with the hub and that rotates the hub. An arm is provided with a pin that displaces the bolt and plate between a locked position and an unlocked position by movement, and one end of a coil-shaped deformable member made of a heat deformable material is fixed to the inner surface of the side plate of the lock. It is characterized in that the arm is fixedly fixed to the upright piece, and the other end is arranged so as to come into contact with a pin arranged on the arm.

With this configuration, the door can be automatically opened even in the event of a fire with a simple and inexpensive configuration, which is effective in preventing disasters.

(Description of Embodiments) The accompanying drawings are side views with a part cut away of the locking device according to the present invention, and FIG. 1 shows the locked state.

A plate 4 is attached to a bolt 3 that is attached to the inside of a door (not shown) and that extends beyond the front plate 2 from a lock that has a bolt and an opening/closing mechanism arranged therein and is held between the side plates 1 and 1'. are integrally attached, and a recess 4a is formed at the rear end.

Reference numeral 5 denotes an operating rod 6 that is rotated by manually operating an outside knob, operating lever, etc. (not shown).
An arm 5a is integrally provided on the hub 5, and a pin 7 is provided near the tip of the arm 5a.

A spring 8 is installed between the pin 9 provided on the side plate 1' and the pin 7, thereby preventing the operation from becoming uncertain due to looseness between the hub 5 and the bolt 3. are doing.

To unlock this lock, manually operate a knob, operating lever, etc. from the outside, and connect the hub 5 via the operating rod 6.
When the arm 5a is rotated counterclockwise as shown in the figure, the arm 5a
rotates in the same direction, and this engages with the recess 4a to slide the plate 4 and therefore the bolt 3 to the right in the figure, causing the bolt 3 to retract from the front plate 2 as shown in FIG. .

It will be readily understood that by rotating the hub 5 in the opposite direction to that described above, the bolt 3 can be projected and locked.

In such a locking device, in the illustrated device, a deformable member 10 made of a thermally deformable material that expands upon heating, such as a shape memory alloy such as Cu-Zn-Al or Ni-Ti, is coiled. An upright piece 1 which is wound around a lock and whose one end 10a is fixed to a side plate 1'
'a, and the other end 10b is arranged so as to come into contact with the pin 7 of the arm 5a when it is in the locked position as shown in FIG.

With this structure, when the indoor temperature rises to a preset temperature due to a fire, the deformable member 10 expands and expands, changing from the state shown in FIG. 1 to the state shown in FIG. 3. Then, since the hub 5 is rotated, the bolt 3 is inserted and unlocked.

(3) Effects of the Invention As explained above, according to the present invention, in the event of a fire, the door lock automatically becomes unlocked due to the rise in temperature. It is easy to modify a known lock of this type without having to modify the lock at all, and it has a remarkable effect on improving the safety of the lock and preventing the occurrence of disasters, and is also advantageous in terms of cost.

[Brief explanation of the drawing]

FIG. 1 is a partially cut-away side view showing a lock according to an embodiment of the present invention in a locked state, FIG. 2 is a side view showing the lock in an unlocked state, and FIG. 3 is a side view showing a lock unlocked by the action of a deformable member. FIG. 3 is a side view showing the locked state. 1, 1'... Side plate, 3... Bolt, 4... Plate, 5... Hub, 10... Deformable member.

Claims (1)

[Scope of Claims] 1. A bolt that protrudes and retracts from the front plate of the lock to lock and unlock the lock, a plate that is formed integrally with the bolt, and a plate that engages with and works with an operating rod that rotates when operated from the outside. a rotating hub; an arm integrally formed with the hub and having a pin that displaces the bolt and plate between a locked position and an unlocked position by rotation of the hub; A lock in which one end of a coil-shaped deformable member made of a deformable material is locked and fixed to an upright piece fixed to the inner surface of the side plate of the lock, and the other end is arranged so as to come into contact with a pin provided on the arm. Bolt unlocking device.