JPS5922215Y2 - locking device - Google Patents

Description

[Detailed description of the invention] This invention relates to a locking device used for electric locks for fire doors, etc.

Conventionally, fire doors with return bullets were installed at the entrances and exits of buildings and wooden structures, and permanent magnets were attached to the structure to keep the fire doors open during normal times, and when an abnormality occurred, the magnetic flux of the permanent magnets was applied. It was designed to close a fire door by passing an electric current through a coil to extinguish the fire.

However, when a permanent magnet is used to attract and hold a fire door, there are the following drawbacks.

That is, (1) since the magnet surface is exposed, rust and dust are likely to adhere to it, and the holding force is likely to be weakened.

As a result, people often inadvertently fell on the fire door, or the door was often blocked by a slight impact.

(2) In addition to requiring flatness of the permanent magnet's attraction, machining precision is required to achieve parallelism with the attraction plate on the fire door side.

(3) The holding force is determined by the magnet and cannot be changed.

Therefore, we cannot accommodate any type of fire door. Therefore, the purpose of this invention is to provide a locking device that is not affected by vibrations or shocks, does not require precision machining, and can change the holding force.

An embodiment of this invention is shown in FIGS. 1 to 3.

That is, this locking device consists of a locking metal fitting A that is attached to the fire door side and a locking metal fitting B that is embedded or protruding from the construction side. It is mainly composed of an unlocking lever 2 driven by a lock lever 2 (omitted), a bending link consisting of a first link 3 and a second link 4, a locking link 5, and a locking link 6.

The locking metal fitting A has a structure in which both ends of a U-shaped hanging metal fitting 8 are welded to the surface of a disk-shaped mounting plate 7.

The lock main body 1 of the lock fitting B is formed into a box shape with four parts 9 cut out on one side.

An insertion hole 10 is formed in the upper end of the lock body 1, and a lever 2 that moves up and down is inserted into the lock body 1 through the insertion hole 10.

The first link 3 of the bending/extending link has an inverted shape, and its bent portion is rotatably supported by a first fixed shaft 11 attached to the lock body 1, and the horizontal portion 3a at one end is connected to the lower surface of the lever 2. The first movable shaft 1 is opposite to the vertical part 3b at the other end.
2 is provided.

The second link 4 is a bent long rod whose upper end is pivotally connected to the first movable shaft 12, and whose lower end is connected to the second movable shaft 12.
A movable shaft 13 is provided.

Since the first link 3 and the second link 4 are supported in an extended state, the torsion linear spring 14 is hung on the first fixed shaft 11 at the middle part thereof, and both ends are connected to the lock body 1 and the first link 3. The extended state is supported by a first stopper pin 15 fixed to the lock body 1, and the downward movement of the lever 2 causes the lever 2 to move to the bent state.

The locking link 5 is arranged horizontally at the lower end of the second link 4, has one end pivotally connected to a second movable shaft 13, and has a second movable shaft 13 at the other end that controls the bending movement of the bending link. A long hole 16 is formed parallel to the direction of movement (upward in the figure), and the long hole 16
It is attached through the second fixed shaft 17.

The locking link 5 also has a locking protrusion 5a having a chevron-shaped inclined surface on its upper side.

The locking link 6 is a third fixed shaft 18 provided in the lock body 1.
A tension coil spring 19 is pivotally connected to the upper side of the locking link 5 and is disposed between one end of the locking link 5 and a middle portion of the locking link 5.
is stretched so that the locking link 5 is rotated about the second movable shaft 13 in the direction in which the locking protrusion 5a advances, and the locking link 6 is rotated to the left in FIG. Rotation is biased.

The locking link 6 also has a hook 20 formed at the other end of the locking link 6 in the opposite direction to the direction in which it rotates to the left by the tension coil spring 19 with the third fixed shaft 18 as a fulcrum, that is, in the unlocking direction. It is located at the bottom of the recess 9 of the lock body 1.

Further, the locking link 6 engages with one slope 5b of the locking protrusion 5a on the opposite surface of the locking hook 5, and locks the hook 20 in the first position.
An engagement protrusion 21 for locking as shown in the figure is formed, and a return protrusion 22 is formed facing the other slope 5C of the locking protrusion 5a.

A second stopper pin 23 is provided on the lock body 1 and positions the locking link 5 in a locked state.

Figure 1 shows the locking device in its locked state, and Figure 2 shows it in its operating state, with the electromagnet activated by a fire detector, smoke detector, etc., operating the lever 2, and locking and unlocking the hook 20. .

That is, in the unlocking operation, when the lever 2 moves downward, the first link 3 of the bending/extension link rotates to the left in the figure with the first fixed shaft 11 as a fulcrum, and as a result, the second link 4 rotates against the first link. 3 into a bent state, and the second movable shaft 13 moves upward.

Due to the upward movement of the second movable shaft 13, the locking hook 5 rotates about the second fixed shaft 17, and at the same time is pushed by the engagement protrusion 21 of the locking link 6 pulled by the tension coil spring 19. Due to the vertical force acting on the slope 5b, the locking link 5 is
The fixed shaft 17 is moved through the elongated hole 16 to rotate the locking link 6 to the left, and the locking protrusion 5a and the engagement protrusion 21 are brought into an immovable state as they abut face-to-face.

As a result, the hook 20 moves in the unlocking direction, so that the locked metal fitting A is unlocked.

On the other hand, when locking the locking metal fitting A, the lever 2 first returns to its original position, and the first and second links 3 and 4 return to their extended states due to the torsion linear spring 14, resulting in the state shown in FIG. .

In this state, when the U-shaped fitting 8 of the locking fitting A is pushed into the recess 9 of the lock body 1, it hits the bottom of the hook 20 and rotates the locking link 6 clockwise, and the locking protrusion 21 changes from the abutting state to the engaged state. The locking link 5 slides onto the slope 5a of the locking projection 5a of the locking link 5 and is pushed back by the return projection 22.
is moved back on the second fixed shaft 17 by the tension coil spring 19, and the hook 20 of the locking link 6 becomes locked.

FIG. 3 shows the operating state when the locked metal fitting A is forcibly pulled to unlock it.

That is, in this case, the bending/extending link is maintained in an extended state, and the second movable shaft 13 maintains its position.

Therefore, when the locking metal fitting A is pulled, the locking link 6 tries to rotate to the left, and the slope 5b of the locking protrusion 5a of the locking link 5
Press.

As a result, the locking link 5 attempts to rotate about the second movable shaft 13 as a fulcrum due to the vertical force on the slope 5b, and when the force overcomes the spring force of the tension coil spring 19, the elongated hole 16 The locking link 6 rotates to the right within the range of , and the locking link 6 rotates to bring the engagement protrusion 21 and the locking protrusion 5a into abutting state, and at the same time, the hook 20 becomes unlocked.

In this case, if the elongated hole 16 is formed in a straight line, a frictional force will be generated between the second movable shaft 13 and the fixed shaft 17 when the second movable shaft 13 is rotated as a fulcrum, and the forcing force can be considerably increased.

As described above, the locking device of this invention is composed of a link mechanism consisting of a locking link with a hook, a locking link, and a bending link, and an unlocking lever, so it is free from the effects of lumps, vibrations, and shocks, and is As in the above, machining precision is not required, and the holding force can be easily changed by changing the spring force, lever ratio, etc.

Furthermore, it has the effect of forcibly releasing the lock separately from operating the unlock lever.

[Brief explanation of the drawing]

FIG. 1 is a side view of the interior of the main body in the locked state of an embodiment of the invention, FIG. 2 is a side view of the operating state, and FIG. 3 is a side view of the forcibly removed state. A: Locking metal fitting, B: Locking metal fitting,
1...Lock body, 2...Unlock lever, 3
, 4... Bending link, 5... Locking link, 5a... Locking protrusion, 5b... Slope, 6...... Locking link, 14... Torsion linear spring, 16... Long hole, 19...
Tension coil spring, 20...Hook, 21...
...Engaging protrusion.

Claims (1)

[Scope of utility model registration request] A lock body, an unlocking lever having at least its tip located within the lock body, supported by a spring in an extended state, one end of which is pivotally connected to the lock body, and is bent by the operation of the unlocking lever. a bending/extending link, one end of which is pivotally connected to the other end of the bending/extending link and biased by a spring in a direction of movement that is moved by the bending action of the bending/extending link; a locking link that is pivotally supported on the lock body by a long hole in the direction and has a locking protrusion with an inclined surface on the side of the lock body on the side in the movement direction; and the lock body that has a hook for locking a locked metal fitting. The bending/extending link has a retaining protrusion which is pivotally attached to the retaining protrusion and is biased by a spring in the direction of releasing the hook, and which engages the inclined surface of the retaining protrusion of the retaining link to lock the hook. A locking device comprising: a locking link in which the engaging protrusion slides and rotates on an inclined surface of the locking protrusion due to rotation of the locking link by a bending action, and the hook is released.