JPH0583709B2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Purpose of the Invention (Field of Industrial Application) This invention relates primarily to a locking device used for closing a door.

(Prior art and issues to be solved) In conventional electric locking devices, due to the need to set up an electric circuit for locking and unlocking, dead bolts are used in electric locking devices installed on frames, pillars, etc. surrounding the door. A structure has been proposed in which this dead bolt enters a locking device provided on the door side when the door is locked (Japanese Patent Laid-Open No. 60-266039).
issue). In this case, in the event of a power outage, the release member moves by operating the cylinder lock provided on the door side, and when it comes into contact with the release rod installed inside the dead bolt, the release member is released. It is designed to be unlocked by retreating with a spring, and a latch bolt is installed in the locking device on the door side.
This latch bolt serves as a temporary lock when the door is closed.

By the way, this type of temporary lock is constantly biased in the locking direction by a relatively weak spring, so in the event of unauthorized entry, for example, a wire with a bent end may be inserted between the pillar, etc. and the door. Then, by bringing this bent part into contact with the inclined surface part of the latch bolt and pulling the wire toward you, the latch bolt will be easily unlocked and locked, so the rest is easy by breaking the dead bolt. The door will be opened.

The present invention has been made in view of the current situation, and is a lock that locks by engaging a dead bolt provided on a pillar, frame, etc. with a locking device provided on the door side. It is an object of the present invention to provide a locking device which also fixes a latch bolt provided for temporary tightening and performs double locking to make opening the door as difficult as possible.

(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 dead bolt on the side of fixed parts such as columns and frames, and removes the latch bolt that protrudes from the end face of the door. In the locking device, a case is disposed on the door side, and the lock is located in the case and is always elastically biased toward the dead bolt side, and is pressed and displaced when the dead bolt enters the door side. A sliding plate, a drive arm that rotates due to the displacement of the sliding plate, and the rotation of the drive arm engages with the latch plate provided integrally with the latch bolt, and the latch bolt is rotated from the door end face of the latch bolt. The device is characterized by comprising a rotation prevention plate that prevents the rotation of the device from being retracted.

With this configuration, double locking becomes possible and security can be improved.

(Description of Embodiments) The attached drawings are side views of essential parts of a locking device showing embodiments of the present invention, and both diagrams show the inside of the locking device with the side plate of the casing removed. At this time, FIG. 2 shows the state when the lock is unlocked.

In Fig. 1, a locking device equipped with a dead bolt is installed at a fixed part on the left side of the figure, which corresponds to a pillar, frame, etc., and only the dead bolt 2 is shown in the figure. On the other hand, it is shown inserted into the locking device on the door side and locked.

A locking device A consisting of an upper case 3 and a lower case 6 is disposed on the door side, and the upper case 3 has a sliding plate 5 that is slidable in the left-right direction in the figure and faces the dead bolt 2. It is placed in position.

A pin 4a is arranged in the upper case,
One end 4a of a spring 4 wound around this contacts the wall surface 3a of the upper case 3, and the other end 4c is loosely fitted into the elongated hole 5a of the sliding plate 5. The sliding plate 5 is always elastically biased toward the left front plate 12 in the figure, and is in contact with the end face of the dead bolt 2 when the lock is locked.

The lower case 6 is provided with a shaft 18, and one end 7a of the drive arm 7 disposed on the shaft projects from the lower case 6 and engages with a notch 5b provided in the sliding plate 5.

Further, a rotation prevention plate 9 is swingably disposed on a pin 10 provided in the lower case 6, and the other end 7b of the drive arm 7 engages with this rotation prevention plate 9. .

A latch bolt 1 is disposed inside the lower case 6 so as to be slidable in the horizontal direction as shown in the figure, and the latch bolt 1 is moved as shown in the figure by a spring 11 disposed between this latch bolt and a rising piece 6a on the inner surface of the case. It has a prominent position.

In the illustrated locked position, a protrusion 9b formed on the side edge 9a of the rotation prevention plate 9 is engaged with the rear end 8a of the latch plate 8, which is provided integrally with the latch bolt 1.

Therefore, in the illustrated position, the dead bolt 2 is fitted into the door side, and the latch bolt 1 is also fitted.
Since it is fixed in the protruding position by an immovable sliding plate 5, a drive arm 7, and a rotation prevention plate 9, it is doubly locked, making it difficult to easily unlock it illegally.

As a result of the unlocking operation, as shown in FIG. 2, when the dead bolt 2 on the fixed part side retreats, the sliding plate 5 moves to the left in the figure under the action of the spring 4, and thereby the drive arm 7 is rotated counterclockwise, and thereby the rotation prevention plate 9 is also rotated counterclockwise, and the engagement between the protrusion 9b and the latch plate 8, and therefore the latch bolt latch 1, is disengaged. The latch bolt 1 can be freely operated by operating a knob (not shown) or the like.

(3) Effects of the invention As explained above, according to the present invention,
In a locking system in which only a dead bolt is attached to a pillar, stile, etc., and a latch bolt is attached to the door side, when the dead bolt enters and engages the door side, the latch bolt on the door side is fixed by this, so it is doubled. Final tightening is possible, providing excellent security.

[Brief explanation of drawings]

FIG. 1 is a side view showing a locked state of a door-side locking device according to an embodiment of the present invention, and FIG. 2 is a side view showing the same unlocked state. 1...Latch bolt, 2...Dead bolt, 3
...Upper case, 4...Spring, 5...Sliding plate, 6...
... lower case, 7 ... drive arm, 8 ... latch plate, 9 ... rotation prevention plate, 10 ... pin, 11 ...
Spring.

Claims (1)

[Scope of Claims] 1. A locking device in which a dead bolt is provided on the side of a fixed part such as a pillar or a frame, and a case having a latch bolt that protrudes and retracts from the end face of the door is arranged on the door side, wherein: , a sliding plate that is always elastically biased toward the dead bolt side and is pressed and displaced when the dead bolt enters the door side; a drive arm that rotates due to the displacement of the sliding plate; A lock device comprising a rotation prevention plate that engages with a latch plate provided integrally with the latch bolt to prevent the latch bolt from retracting from the end face of the door when the drive arm rotates.