JPH11200695A - Lock metal fitting of door - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lock metal fitting which can automatically lock a door provided at a doorway when a fire occurs in a room. SOLUTION: A latch bolt 15 is slidably supported by a latch holder 2 having a mounting plate 6. A latch 17 at a tip of the latch bolt 15 is inserted into a latch insertion hole 8 provided in the mounting plate 6. A first spring 21 which presses the latch bolt 15 in the direction in which the latch 17 protrudes outward and a second spring 22 which presses the latch bolt 15 in the direction in which the latch 17 retreats into the latch insertion hole 8 are provided. The second spring 22 is formed by shape memory alloy, and the latch 17 in which the second spring 22 is assembled in a condition in which it is pulled and elongated is held at a retreat position. A lock metal fitting is attached to a door, the second spring 22 is shrunk due to a rise of temperature caused by a fire in a room, the latch bolt 15 is moved due to elastic force of the first spring 21, and the latch 17 at the tip is engaged with an engaging hole 42 provided at an opposing position to lock a door.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door lock which automatically locks an openable door provided at an entrance of a building in the event of a fire.

[0002]

2. Description of the Related Art Generally, in a double door, a latch bolt is attached to one side of a joining portion of two doors supported to be openable and closable, and a receiving bracket is fixed to the other side. Since the configuration is such that the two doors are held in the closed state by the engagement of the catches, the reliability of holding each door in the closed state is poor. If a fire occurs in the room, the temperature rises. There is a risk that the door will open due to the pressure increase and the fire will spread due to a fire leak.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a door lock which can automatically lock a door that opens and closes an entrance when a room fire occurs in a closed state.

[0004]

In order to solve the above-mentioned problems, a first aspect of the present invention has a mounting plate mounted on a surface of a door, and a bolt receiving space is formed on a back side of the mounting plate. A latch holder, a latch bolt inserted into a bolt receiving space of the latch holder, slidably supported in the axial direction, and a latch provided at a tip inserted into a latch insertion hole formed in the mounting plate; A first spring for urging the latch bolt in a direction in which the latch protrudes outward, and a second spring for urging the latch bolt in a direction in which the latch retracts into the latch holder, wherein the second spring is a shape memory alloy. The second spring is assembled in a state where the second spring is stretched from the state at the time of shape memory, and the elastic force at the time of the assembly is set to the first spring. It employs a configuration which holds the latch in the retracted position and larger than the elastic force of the ring.

According to a second aspect of the present invention, there is provided a latch holder having a mounting plate mounted on a surface of a door, wherein a latch receiving space is formed on the back side of the mounting plate.
The latch is inserted into the bolt receiving space of the latch holder and supported so as to be slidable in the axial direction, and the latch provided at the distal end is latched in the latch insertion hole formed in the mounting plate. A first spring for urging the latch bolt in a protruding direction, and a second spring for urging the latch bolt in a direction in which the latch retracts into the latch holder; and the first spring is made of a shape memory alloy. The first spring is assembled in a state where the first spring is contracted from the state when the shape is stored, and the elastic force when the first spring is extended is larger than the elastic force of the second spring.

Here, in order to be able to adjust the position of the latch according to the size of the gap formed between the doors or between the door and the door frame, the latch is screwed to the tip of a latch bolt. It is good to match.

In order to improve the responsiveness of the latch due to a rise in temperature, the latch holder is preferably made of a metal having high thermal conductivity such as copper or brass.

The lock fitting having the above configuration is used by being attached to a door, and an engagement hole is provided at a position facing the lock fitting. In such a state of use, when a fire occurs and the ambient temperature exceeds the transformation temperature of the second spring, the second spring contracts and the latch bolt moves outward due to the elasticity of the first spring, and The latch engages with the engagement hole provided at the opposing position to lock the door.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the lock 1 has a latch holder 2. The latch holder 2 is provided with a pair of side plates 4 on both sides of the end plate 3, a mounting plate 6 is mounted on a flange 5 formed outward from the end of each side plate 4, and a bolt storage space 7 is provided on the back side of the mounting plate 6. Is formed. The mounting plate 6 has a latch insertion hole 8,
A pair of screw insertion holes 9 are formed on both sides thereof.

A pair of holes 10 are formed in the pair of side plates 4 of the latch holder 2 at opposing positions, and a projecting piece 12 provided at a position opposing the outer periphery of the spring seat 11 is inserted into each hole 10.

Bolt insertion holes 13 and 14 are formed coaxially in the spring seat 11 and the end plate 3 of the latch holder 2, and a latch bolt 15 incorporated in the bolt storage space 7 slides in the bolt insertion holes 13 and 14. It is freely inserted.

The latch bolt 15 has a small-diameter screw shaft 16 at its tip, and a latch 17 is screwed to the screw shaft 16. The latch 17 is inserted into the latch insertion hole 8 formed in the mounting plate 6, and has a flat engagement surface 18 formed on the outer periphery of the latch 17 and a linear engagement provided on the inner periphery of the latch insertion hole 8. Latch 17 is engaged by engagement of mating edge 19.
Is locked.

A flange 20 is provided at the center in the length direction of the latch bolt 15, and a first spring 21 provided between the flange 20 and the end plate 3 acts in a direction in which the latch 17 moves outward. The latch bolt 15 is pressed.

Also, the flange 20 and the spring seat 1
A second spring 22 is incorporated between the first spring 22 and the first spring 22. The second spring 22 is made of a shape memory alloy, and is assembled between the flange 20 and the spring seat 11 in a state where the second spring 22 is stretched from the state at the time of shape memory. The elastic force of the second spring 22 in the assembled state is the first spring 2
The elastic force urges the latch bolt 15 in a direction in which the latch 17 retreats into the latch insertion hole 8 by the elastic force.

The lock fitting 1 shown in the embodiment has the above structure, and FIG. 3 shows an example of the use of the lock fitting 1. In this use example, the lock fittings 1 are attached to the top and bottom at the door end side end of the door 32 supported on the door frame 30 via the hinge 31 so as to be openable and closable.
And a receiving bracket 40 is attached to the front side.

In mounting the lock fitting 1, as shown in FIG. 1, a hole 33 is provided in the door 32, the latch holder 2 is inserted into the hole 33, and a mounting plate abutted on the outer periphery of the door 32. 6 is fixed by tightening a screw 34 screwed into the door 32 from the screw insertion hole 9.

The receiving member 40 is fixed to the door frame 30 by tightening a screw 41 screwed into the door frame 30, and the receiving member 40 has an engaging hole 42 with which the latch 17 can be engaged.

It is also possible to omit the receiving fitting 40 and directly provide the engaging hole 42 in the door frame 30.

Prior to the mounting of the lock fitting 1 as described above, the position of the latch 17 is adjusted in accordance with the size of the gap 35 formed between the facing portions of the door frame 30 and the door 32. At the time of position adjustment, the latch bolt 15 is rotated with respect to the latch 17 that has been prevented from rotating, and the latch 17 is moved in the axial direction of the latch bolt 15.

If a fire occurs in the state where the lock fitting 1 is mounted as described above and the ambient temperature at the mounting position of the lock fitting 1 exceeds the transformation temperature of the second spring 22, the second spring 22 contracts. To return to the state at the time of shape memory. Therefore, the latch bolt 15 is moved outward by the elastic force of the first spring 21, and the latch 17 at the distal end is engaged with the engagement hole 42 of the receiving bracket 40 as shown in FIG.
And the door 32 is held in the locked state.

For this reason, even if the temperature in the room rises and the pressure rises, the door 32 does not open and the spread of fire due to the leakage of the flame can be prevented.

Here, if the other parts except the latch holder 2 and the mounting plate 6 of the latch holder 2 are formed of a metal having excellent heat conductivity such as copper or brass, the response of the latch 17 due to a rise in temperature is improved. Can be achieved.

In the embodiment, the lock fitting 1 is mounted on the upper and lower sides of the door 32, but the mounting position of the lock fitting 1 is not limited to this. For example, you may make it attach to the side surface of the door 32 at the door tip side. In the case of a double door, the door may be attached to the joining portion.

Although not shown in the drawing, in the lock fitting shown in FIG. 1, the first spring 21 may be formed of a shape memory alloy and the second spring 22 may be formed of spring steel. In this case, the first spring 21 is assembled in a contracted state from the state at the time of shape memory, and the latch bolt 15 is held at the retracted position by the elasticity of the second spring 22 during the assembly.

When a fire occurs, the first spring 21 is extended, and the elastic force at the time of extension causes the latch bolt 15 to move forward (up) against the elasticity of the second spring 22.

FIGS. 5 and 6 show another embodiment of the lock fitting according to the present invention. In the lock fitting shown in FIG. 5, a spring 23 made of a shape memory alloy is assembled between the spring seat 11 and the flange 20 of the latch bolt 15 in a stretched state, and its end is connected to the flange 20. When the temperature rises above the transformation temperature of the shape memory alloy, the spring 23 is contracted to move the latch bolt 15 in the axial direction, and the tip latch 17 is engaged with the engagement hole 42.

The other components are the same as those of the lock fitting shown in FIG. 1, so that the same components are denoted by the same reference numerals and description thereof will be omitted.

In the lock fitting shown in FIG. 6, a spring 24 made of a shape memory alloy is assembled between the flange 20 of the latch bolt 15 and the end plate 3 in a contracted state, and the end of the spring 24 is attached to the flange 20. When the temperature rises above the transformation temperature of the shape memory alloy, the spring 24
Is extended to move the latch bolt 15 in the axial direction so that the latch 17 at the distal end is engaged with the engagement hole 42.

Since the other construction is the same as that of the lock fitting shown in FIG. 1, the same reference numerals are given to the same parts and the description is omitted.

Each of the lock fittings shown in FIGS. 5 and 6 can automatically lock the door in the event of a fire and has a simple structure using a single spring, which is advantageous in cost.

[0032]

As described above, in the present invention, when the temperature of the room rises due to the occurrence of a fire and the ambient temperature at the mounting position of the lock fitting exceeds the transformation temperature of the second spring made of a shape memory alloy, Since the latch moves outward and engages with the engagement hole provided at the opposing position, the door can be automatically locked. Therefore, it is possible to prevent the spread of fire and improve safety.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing an embodiment of a lock fitting according to the present invention.

FIG. 2 is an exploded perspective view of the above.

FIG. 3 is a front view showing a use state of the above.

FIG. 4 is a longitudinal sectional front view showing an engagement state of the lock fitting of the above.

FIG. 5 is a longitudinal sectional front view showing another embodiment of the lock fitting according to the present invention.

FIG. 6 is a longitudinal sectional front view showing still another embodiment of the lock fitting according to the present invention.

[Explanation of symbols]

 2 Latch holder 6 Mounting plate 7 Bolt storage space 8 Latch insertion hole 15 Latch bolt 17 Latch 21 First spring 22 Second spring

Claims (4)

[Claims] 1. A latch holder having a mounting plate mounted on a surface of a door and having a bolt receiving space formed on the back side of the mounting plate, and a latch holder incorporated in the bolt receiving space of the latch holder so as to be slidable in the axial direction. Supported,
A latch provided at a distal end thereof, a latch bolt inserted into a latch insertion hole formed in the mounting plate, a first spring for urging the latch bolt in a direction in which the latch protrudes outward, and the latch comprising a latch holder. And a second spring for urging the latch bolt in a direction of retreating inward. The second spring is made of a shape memory alloy, and the second spring is assembled in a state where the second spring is stretched from a state at the time of shape memory. A lock fitting for a door in which the elastic force at the time of assembly is larger than the elastic force of the first spring to hold the latch at the retracted position. 2. A latch holder having a mounting plate mounted on a surface of a door, wherein a bolt receiving space is formed on the back side of the mounting plate, and a latch holder incorporated into the bolt receiving space of the latch holder so as to be slidable in the axial direction. Supported,
A latch provided at a distal end thereof, a latch bolt inserted into a latch insertion hole formed in the mounting plate, a first spring for urging the latch bolt in a direction in which the latch protrudes outward, and the latch comprising a latch holder. A first spring made of a shape memory alloy, and the first spring is assembled in a contracted state from a state at the time of shape memory. And a locking member for the door, wherein the elastic force of the first spring when extended is greater than the elastic force of the second spring. 3. The lock fitting for a door according to claim 1, wherein the latch is screw-engaged with a tip of a latch bolt. 4. The lock fitting for a door according to claim 1, wherein the latch holder is made of a metal having high thermal conductivity.