JPH0331865B2 - - 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 disadvantage 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 it is a lock that senses the fire as sensitively as possible and automatically unlocks the door, allowing the door to be opened and closed freely. The purpose of this invention is to provide an unlocking device.

(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. a plate integrally formed therewith, and a hub that engages with and rotates with an operating rod that rotates when operated from the outside;
an arm that is formed integrally with the hub and has a pin that displaces the bolt and plate between a locked position and an unlocked position by rotation of the hub, and is attached to an immovable part within the lock. One end of the drive cam, which is pivotally connected to a pin that is pivoted and swings in a plane parallel to the displacement plane of the pin that displaces the bolt and plate between the locking and unlocking positions, is brought into contact with this pin, and the other end is placed in the lock position. A deformable member made of a material that contracts when heated is locked between the projecting end and a protrusion formed on the outside of the bottom wall. It is characterized by this.

With this configuration, even in the event of a fire, it is possible to acutely sense the occurrence of a fire and automatically open the door 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 is sandwiched between the side plates 1 and 1' and has a bolt and an opening/closing mechanism therein. A recess 4a is formed at the rear end.

Reference numeral 5 denotes a hub that rotates with an operating rod 6 that rotates together with an external knob, operating lever, etc. (not shown).An arm 5a is integrally provided on the hub 5, and an arm 5a is provided near the tip of the hub 5. A pin 7 is provided at a position where it engages with the recess 4a.

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

To unlock this lock, operate a knob, operating lever, etc. from the outside to rotate the hub 5 in the counterclockwise direction shown in the figure via the operating rod 6, and the arm 5a will also rotate in the same direction. The plate 4 engages with the recess 4a.
Therefore, slide the bolt 3 to the right in the diagram,
As shown in FIG. 2, the bolts 3 are retracted from the front plate 2.

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 lock device, in the illustrated device, a drive cam 10 is pivotally attached to the pin 9, one end 10a of the cam is brought into contact with the pin 7 formed on the arm, and the other end 10b is attached to the side plate 1. The end 10b protrudes outward from an opening formed in the bottom wall 1'a of the plate 4 and extends in the displacement direction of the plate 4.
and the protrusion 1'b similarly formed on the bottom wall 1'a, there is a thermally deformable material that contracts when heated, such as a shape memory alloy such as Cu-Zn-Al or Ni-Ti. Both ends 11'', 1 of the deformable member 11 constituted by
1' is normally suspended so that the end 10a abuts against the pin 7 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 11 contracts and deforms, changing from the state shown in FIG. 1 to the state shown in FIG. 3. Then, the drive cam 10 rotates, causing the hub 5 to rotate via the pin 7 in contact with the drive cam 10, whereby the bolt 3 is recessed and unlocked.

(3) Effects of the Invention As explained above, according to the present invention, when a fire occurs, the door lock automatically becomes openable due to the temperature rise, and its structure is simple, eliminating the need for complicated accessories. It is easy to modify this type of lock, which is known in the public domain, without requiring any mechanism.Since the heat-sensitive part is exposed outside the box-shaped lock, the fire detection sensitivity is good, and the deformable member is Since it is firmly attached at both ends, it will not come off the fixed position due to vibrations caused by opening and closing the door under normal conditions, ensuring reliable operation and having a remarkable effect on preventing disasters, and also from a cost perspective. It's advantageous.

[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, 11... 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 formed integrally with the bolt, and a plate that engages with and rotates with the operating rod that rotates when operated from the outside. an arm that is formed integrally with the hub and is provided with a pin that displaces the bolt and plate between a locked position and an unlocked position by rotation of the hub; One end of a drive cam that is pivotally connected to a pin attached to an immovable part and swings in a plane parallel to a displacement plane of the pin that displaces the bolt and plate between locking and unlocking positions is brought into contact with this pin. The other end is made to protrude outside from an opening formed in the bottom wall of the lock, and a deformable member made of a material that contracts when heated is engaged between this protruding end and a protrusion formed on the outside of the bottom wall. An unlocking device for locking bolts.