JP2000145218A - Safety device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve safety of a lock by making picking invalid. SOLUTION: This safety device includes a thumb-turn shaft 5 having a deformed cross section part 12 formed in a part thereof along the longitudinal direction, a lock plate 13 which is guided movably in a plane vertical to the thumb-turn shaft 5 and has a cutout engaged with the deformed cross section part 12 to restrict turning of the thumb-turn shaft 5, and an electromagnetic actuator 14 for selectively driving the lock plate 13 to a lock position where the cutout is engaged with the deformed cross section part 12 and an unlock position where it is separated from the deformed cross section part 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel safety device capable of locking a thumb turn shaft from the outdoor side in order to improve safety of a lock.

[0002]

2. Description of the Related Art It is a well-known fact that a cylinder lock of a lock at a door is not impossible to unlock by so-called picking, and a door chain or a so-called guard capable of improving the safety of the lock. The arm device can be operated only from the indoor side.

[0003]

In other words, the conventional safety device can improve the safety of the lock when there is a person in the room and it is difficult for a malicious third party to enter the lock. Device.

[0004] Therefore, a so-called one-door two-lock system in which two locks are mounted on one door is recommended.

However, one-door tourism is
Since the cylinder lock and the lock box are mounted on the other set of doors, there is a disadvantage that it is uneconomical.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a novel safety device which has a simple structure and can improve the safety of a lock as compared with a one-door two-lock system.

[0007]

In order to achieve the above-mentioned object, the invention according to claim 1 comprises a thumb-turn shaft having an irregular cross-section formed in a part thereof along a longitudinal direction, and a plane perpendicular to the thumb-turn shaft. A lock plate which is movably guided in the inside, and which has a notch for engaging with the above-mentioned irregular cross-section and restraining the rotation of the thumb-turn shaft; and a lock for engaging this lock plate with the above-mentioned irregular cross-section. And an electromagnetic actuator that selectively drives between a position and an unlock position separated from the deformed cross section.

According to a second aspect of the present invention, the notch of the lock plate has a pair of edges parallel to its guide direction, and the cross-sectional shape of the irregular cross-section is rectangular, oval, or square. And a hexagon.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. 1 and 2, reference numeral 1 denotes an inner surface of a door, and a safety device 2 according to the present invention is provided on the indoor side.

A thumb-turn shaft 5 is rotatable so as to pass through a board 3 screwed to the inner surface 1 of the door and a case pair 4 of an open box lock mounted on the door 3 so as to cover the board 3. It is supported.

That is, the indoor end (left end in FIG. 1) of the thumb-turn shaft 5 is inserted into the thumb-turn shaft hole (not numbered) of the substrate 3 from the outdoor side, and the portion protruding from the case body 4 into the room is removed. For example, it is restricted in the length direction by the retaining ring 6.

A connecting piece 7 having a cruciform cross-sectional shape is integrally attached to the inner end of the thumb-turn shaft 5, and the inner end of the thumb-turn shaft 5 having the connecting piece 7 attached to its tip is a door surface and A side plate of a lock box (not shown) is inserted through the lock box and engaged with a dharma shaft 9 having a dharma-shaped clutch hole 8 (see FIG. 3) opened.

A tail piece integrally connected to the inner cylinder of the cylinder lock from the outside is engaged with the dharma shaft 9 in the same manner as a normal locking mechanism.

Incidentally, a dead cam (not shown) is integrally mounted on an outer peripheral portion of the dharma shaft 9, and the coming and going of a locking bolt such as a dead bolt is controlled by the dead cam.

On the other hand, as shown in FIG.
A rectangular section is formed at the indoor side end of the knob, and a finger 1 is used to put a finger when operating the thumb-turn shaft on the rectangular section.
1 is attached.

On the other hand, at the center of the thumb-turn shaft 5 in the case body 4, an odd-shaped section 12 having an oval cross section is formed, for example.
As shown in FIG. 2, a lock plate 13 having a rectangular notch with a corner cut at one end is arranged so that the notch can be engaged with the odd-shaped section 12.

In the illustrated embodiment, the cross-sectional shape of the modified cross-section 12 is an oval shape, but is not limited to an oval shape, and may be, for example, a rectangle, a square, or a hexagon.

The other end of the lock plate 13 is supported by a plunger of an electromagnetic actuator 14 such as a latching solenoid, and the lock plate 13 is perpendicular to the thumb-turn shaft 5 with its rotation about its axis restricted by this plunger. It is supported and guided so as to be movable left and right in a plane.

The latching solenoid 14 is
When the safety device is unlocked, for example, when a positive DC voltage is applied, the plunger retracts as shown by a solid line in FIG.
The retracted state is maintained even after the current is interrupted by the attractive force of the permanent magnet. Conversely, when a negative DC voltage is applied during locking, the plunger protrudes and pushes the lock plate 13 to the position shown by the chain line in FIG. It operates so that the pushing position is maintained even after the current is interrupted by the attractive force of the permanent magnet.

The electromagnetic actuator 14 includes, for example, a ten-key device (not shown) provided outdoors, such as an electromagnetic actuator in an electric lock, and a secret code previously stored with a secret code input by the ten-key device. It is controlled by a comparison device that generates a lock signal when a comparison is made.

The comparison device also stores another security code, and supplies an unlock signal to the electromagnetic actuator 14 when another security code input by the numeric keypad matches a previously stored security code. I do.

In the safety device according to one embodiment of the present invention constructed as described above, the lock plate 13 is normally separated from the thumb turn shaft 5 as shown in FIG.

In this state, when viewed from the thumb-turn shaft 5, it is the same as when there is no safety device, so that it operates as a normal thumb-turn device.

When going out, after the cylinder lock is locked, the ten-key device is operated if necessary, a lock code is input, and a lock signal is supplied to the electromagnetic actuator 14.

Then, as shown by a chain line in FIG. 2, the lock plate 13 moves to the right to engage the notch with the irregular cross section.

In this state, when the cylinder lock is illegally unlocked by picking and the dharma shaft 9 is to be rotated in the unlocking direction from the outside of the room, the thumb turn shaft 5 and the dharma shaft 9 are circumferentially connected as shown in FIG. In the direction, the external force for retracting the dead bolt through the darma shaft 9 is stopped by the lock plate 13 through the deformed section 12 of the thumb turn shaft, and the cylinder lock is further locked. It cannot be turned.

By the way, the operation of the cylinder lock using the duplicate key is usually of two types, namely, inserting the key into the keyhole, turning it 90 degrees in the unlocking direction, returning it 90 degrees after unlocking, and removing the key. After the key is inserted, it is turned 180 degrees in the unlocking direction, and the key is removed at that angular position.

In the former case, the rotation is prevented at the beginning of the rotation in the unlocking direction. In the latter case, the inner cylinder of the cylinder lock idles 90 degrees due to the action of the clutch hole 8 of the dharma shaft 9. Further rotation is prevented.

Therefore, even if the cylinder lock is unlocked by picking, the deadbolt cannot be retracted, and the unlocking becomes invalid after all.

When the main lock of the door is an electric lock, it is believed that the electric lock is relatively difficult to pick, but the electric lock is generally provided with a mechanical cylinder lock in case of power failure or battery consumption. Therefore, the safety against picking is the same as that of a cylinder lock, and the safety device according to the present invention is useful for an electric lock.

On the other hand, when the family member returns and unlocks the cylinder lock with the duplicate key, the ten-key device is operated to input a password for unlocking and supply an unlock signal to the electromagnetic actuator 14.

Then, the plunger of the electromagnetic actuator 14 moves to the left in FIG. 2, and the engagement between the lock plate 13 and the thumb turn shaft 5 is released. Thereafter, the cylinder lock is unlocked using the duplicate key, or the electric lock is unlocked using the numeric keypad device.

[0033]

As is apparent from the above description, according to the present invention, since the thumb turn shaft is restrained by remote control from outside of the room by the electromagnetic actuator when going out, the dead bolt can be unlocked by picking. Cannot be retracted, so that the picking is invalidated and the safety of the lock can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view of a safety device according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional front view showing the case body removed.

FIG. 3 is an enlarged partial sectional view taken along line III-III in FIG.

[Explanation of symbols]

 2 Safety device 3 Substrate 4 Case body 5 Thumb turn shaft 12 Irregular cross section 13 Lock plate 14 Electromagnetic actuator

Claims (2)

[Claims] 1. A thumb-turn shaft having a deformed cross-section formed in a part thereof along the length direction, and is guided movably in a plane perpendicular to the thumb-turn shaft, and engages with the deformed cross-section to rotate the thumb-turn shaft. A lock plate formed with a notch for restraining movement,
A safety device comprising: an electromagnetic actuator that selectively drives the lock plate between a lock position where the notch engages with the deformed cross-section and an unlock position that is separated from the deformed cross-section. 2. The notch of the lock plate has a pair of edges parallel to the guide direction, and the cross-sectional shape of the irregular cross-section is any one of a rectangle, an oval, a square, and a hexagon. The safety device according to claim 1, wherein the safety device is provided.