JPH0225898Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a lock mechanism widely used for general doors, etc., and in particular, a lock that closes easily when closed, has a reliable locking effect, and is suitable for electrical control. It is related to.

In recent years, there has been a strong tendency to electrically control locks in hotels and the like to obtain higher safety. In this case, several disadvantages arise with conventional locking mechanisms. First, if the latch of the lock moves slowly, if the door is inadvertently closed, the latch will not retract completely and will stop at the outside of the strike plate, leaving the door in a so-called ajar state. In this state, it is completely impossible to lock the door and it is extremely dangerous. Further, locks in which the latch bolt is also used as a dead bolt have a simple structure, but the amount of bolt protrusion during locking is generally small, and the safety is not sufficient. Additionally, for those with a structure in which the dead bolt is protruded by a key or thumb turn, when locking and unlocking the lock electrically from the outside, the heavy dead bolt must be operated with a long stroke of 20 mm or more, and this is done using a motor or electromagnet. requires a large amount of power.

The lock of the present invention has a simple structure and is extremely rational, solving all of these drawbacks. The structure will be explained below with reference to the figures.

FIG. 1 is a side sectional view showing the structure of an embodiment of the present invention.

In FIG. 1, a case 1 is provided with a latch bolt 3 which can be inserted into and removed from a front hole 2 of the case 1. The latch bolt 3 has a recess 4 at its lower part and a guide block 6 through a shaft 5 at its rear part. The groove 7 of the guide block 6 is slidably and loosely fitted into a guide surface 8 provided so as to protrude from the inner surface of the case 1, and the guide block 6 has a hook portion 9 on its lower surface. On the other hand, a hook 11 is rotatably engaged with a shaft 10 fixed to the case 1, and a spring 12
is biased to rotate counterclockwise. One end of the hook 11 is located in the recess 4 of the latch bolt 3.
to lock the latch bolt 3 in the middle position of the protrusion stroke. Furthermore, a magnet 13 is fixed to the other end of the hook 11.

On the other hand, a strike plate 14 provided on the side facing the case 1 attached to the door has a recess 15 and a magnet 16, the recess 15 is for receiving the latch bolt 3, and the magnet 16 is located at the tip of the hook 11 constitutes a magnet mechanism with the magnet 13 of
They are arranged so that the different poles face each other when the door is closed so that an attractive force is generated between them. The front surface of the case 1 and the strike plate 14 are made of a material that allows magnetic lines of force to pass through, such as stainless steel. Further, 17 is a spring for protruding the latch bolt 3, and the lock lever 18 is supported by a shaft 19 so as to be rotatable at a fixed angle.

FIG. 2 is a simplified top view showing one embodiment of the present invention.

In FIG. 2, one side of the latch bolt 3 is beveled so that it can be retracted by the strike plate 14 when the door is closed.

Next, the operation of the present invention will be explained with reference to the drawings.

In FIGS. 1 and 2, when the door is open, the strike plate 14 on the sill side is
Since it is not facing the case 1, the tip of the hook 11 is always kept in the recess 4 by the biasing force of the spring 12.
The latch bolt 3 cannot protrude beyond the position shown by the solid line in FIG. 1, that is, the intermediate position of the protrusion stroke. However, when closing the door from this state, first the latch bolt 3 is moved slightly from the case 1 by the strike plate 14.
The tip of the hook 11 and the right side surface of the recess 4 are pressed against each other by the biasing force of the spring 17, and the pressed state between the tip of the hook 11 and the right side surface of the recess 4 is released. Also, at this time, the magnet 13 is attached to the hook 11 due to the attractive force with the magnet 16.
Since it is rotated clockwise, its tip will fit into the recess 4.
deviate from In this case, as mentioned above, the spring 17 between the right side surface of the recess 4 and the tip of the hook 11
The pressurized state caused by the urging force of is released by pushing the latch bolt 3 into the case 1 a little, so there is no frictional force between them, other than the force caused by the spring 12. There is no special load on the magnets 13 and 16, and even if the attraction force between the magnets 13 and 16 is relatively weak, the magnets operate sufficiently and reliably. Note that the hook 11 rotates clockwise as the latch bolt 3 is pushed in by the strike plate 14.
Since the magnet 13 moves in a direction closer to the magnet 16 of the strike plate 14 to increase the attractive force between the two, it is superior to one that uses the repulsive force of the magnet. Furthermore, when the door is completely closed, the latch bolt 3
protrudes into the recess 15 of the strike plate 14, but at this time the hook 11 is removed from the recess 4, so the latch bolt 3 protrudes into the full stroke recess 15 as shown by the dotted line. When opening the door, the hook part 9 of the guide block 6 is linked to an external knob by a mechanism not shown, and the door can be opened by pulling it to the right. When the knob is released, the latch bolt 3 is moved to the first solid line. It protrudes to a certain position and stops. If the lock lever 18 is rotated counterclockwise with a key, thumb turn, electromagnet, etc. (not shown) while the door is closed, the latch bolt 3 cannot be retracted and the door is completely locked. In this case, the locking operation is only the rotation of the lock lever 18, the load is small, and the stroke is also small, so in the case of an electromagnet, a relatively small one is sufficient and it can be operated with less electric power.

As explained above, in the lock of the present invention, since the amount of protrusion of the latch bolt at the intermediate position is small, the amount that the latch bolt can be retracted by the strike plate when closing the door is small, and the lock can be closed with a weak force. Since the door will not remain ajar if it hits the edge of the strike plate, safety can be improved.

Furthermore, since the latch bolt once protrudes into the recess of the strike plate has a large protruding amount, it has a large effect as a so-called dead bolt when locking the lock, and is difficult to remove from the outside, resulting in extremely high safety. Also, locking/unlocking requires only a slight rotation of the lock lever, so if this is done electrically,
Since the power consumed by the electromagnet and the like can be extremely small, this is particularly advantageous for electric locks with built-in batteries.

The latch bolt protrudes depending on the strike plate, the position of the magnet therein, the direction of magnetization, etc., and it is impossible for the latch bolt to inadvertently protrude with the door open, which may cause practical problems. There are also few. Furthermore, since the mechanism is relatively simple, failures are rare and the cost is low.

As is clear from the above description, the lock of the present invention has many advantages and its safety effects are extremely significant.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing the structure of an embodiment of the present invention, and FIG. 2 is a simplified top view thereof. 1... Case, 3... Latch bolt, 4... Recess, 11... Hook, 13... Magnet, 14... Strike plate, 16... Magnet, 18... Lock lever.

Claims (1)

[Scope of utility model registration request] A lock lever operated by an electromagnetic force to lock a latch bolt in a protruding state that can protrude into a recess of a strike plate facing from the front face of the lock, and a hook mechanism to lock the latch bolt at an intermediate position of the protrusion stroke of the latch bolt; It has a magnet mechanism for releasing the lock between the latch bolt and the hook mechanism, the hook mechanism is rotatably supported and biased in one rotation direction, and one end of the hook mechanism is engaged with a recess of the latch bolt. The latch bolt is locked, and a magnet is fixed to the other end, and the magnet mechanism includes the magnet arranged in such a way that different poles face each other when the door is closed, and the magnet provided in the strike plate. characterized in that when the latch bolt contacts the strike plate and is retracted from the intermediate position, the magnet mechanism operates the hook mechanism by the attractive force of both magnets to release the latch bolt. A lock to do.