JP2000192697A - Safety device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the safety of a lock by disabling picking. SOLUTION: An engaging projection 13 is formed on a thumb-turn shaft 5 which is guided into a thumb-turn guide cylinder 2 in a manner being roratable and movable in a longitudinal direction and is biased in a direction approaching a cylinder lock 12, and an engaging depression 4 for engaging with the engaging projection 13 to inhibit movement of the projection 13 in the circumferential direction is formed in the thumb-turn guide cylinder 2. On the other hand, one end of an operating pin 17 is internally inserted into a key hole internal end of a cylinder lock 12 in a manner being movable in the longitudinal direction, and the other end of the operating pin 17 is abutted on the internal end of the thumb-turn shaft 5. At the time of locking, the engaging projection 13 is engaged with the engaging depression 4, to thereby prevent the thumb-turn shaft 5 from being rotated. On the other hand, at the time of unlocking, the operating pin 17 is extruded by the front end of a duplicate key 19 in a direction of the thumb-turn shaft 5, whereby the engaging projection 13 is pulled out of the engaging depression 4.

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 in which picking is virtually impossible in order to improve the 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]

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

[0004] 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 makes picking practically impossible with a simple structure and which can improve the safety of a lock compared to a one-door two-lock.

[0006]

In order to achieve the above object, the invention according to claim 1 is guided by a thumb turn guide cylinder so as to be rotatable and movably in the longitudinal direction, and is brought close to a cylinder lock. A thumb-turn shaft urged in the direction, and an engagement protrusion on one of the above-mentioned thumb-turn guide cylinders, and a locking recess that engages with the engagement protrusion to prevent movement in the circumferential direction, respectively, are formed, On the other hand, one end of the operating pin is inserted movably in the length direction from the inside into the inner end of the keyhole of the cylinder lock, and the other end of the operating pin faces the inner end of the thumb turn shaft. Engage the engagement projection with the engagement recess to prevent the thumb-turn shaft from rotating, and when unlocking, push out the operating pin with the tip of the duplicate key in the axial direction of the thumb-turn, and remove the engagement protrusion from the engagement recess. It is characterized by doing so.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 indicates a door,
A thumb-turn guide tube 2 with a flange is screwed to the inner surface (left surface in the figure) of the door 1.

The thumb-turn guide cylinder 2 has a stepped inner cylinder portion having a small diameter at the inner end (left end in the figure), and the outer peripheral portion of the inner end surface is deeper in the generatrix direction as shown in FIG. Locking recess 4
Are formed.

In addition, the inner cylinder portion of the thumb turn guide cylinder 2 includes:
As shown in FIG. 1, a thumb-turn shaft 5 having an irregularly shaped cross-section, a small-diameter portion, and a large-diameter portion connected in order from the inner end is fitted rotatably and movably in the length direction.

That is, the indoor end (the left end in FIG. 1) of the thumb turn shaft 5 is inserted from the outdoor side into the large-diameter portion of the thumb turn guide cylinder 2, and the part protruding into the room from the inner end of the thumb turn guide cylinder 2 is removed. For example, it is restricted in the length direction by the retaining ring 6.

A connecting piece 7 having a cruciform cross section 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 therethrough and engaged with a dharma shaft 9 having a dharma-shaped clutch hole 8 (see FIG. 3) opened.

A tail piece integrally connected to an inner cylinder of a cylinder lock, which will be described later, is engaged with the dharma shaft 9 from the outside 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.

As shown in FIG. 1, an urging spring 11 as a compression coil spring is elastically mounted between the inner cylinder step of the thumb turn guide cylinder 2 and the large diameter step of the thumb turn shaft 5. Due to the elasticity of the biasing spring 11, the thumb turn shaft 5 is biased in a direction approaching the cylinder lock 12.

On the other hand, a pin-like engaging projection 13 which is driven in the radial direction of the thumb-turn shaft is protruded from a portion of the thumb-turn shaft 5 near the retaining ring 6 and on the outdoor side thereof.

Therefore, even if the elastic force of the urging spring 11 urges the thumb-turn shaft 5 outward, the engaging projections 13 are formed on the inner end surface of the thumb-turn guide cylinder 2 or the locking recess 4 (see FIG. 2). Since it is locked to the bottom surface, the thumb-turn shaft 5 does not come out outward.

Furthermore, as shown in FIG. 1, a deformed cross section (square in the illustrated embodiment) of the thumb-turn shaft 5 on the indoor side.
Is mounted with a knob 14 for putting a finger when operating the thumb-turn shaft.

On the other hand, as shown in FIG. 1, a tail piece 16 is fitted to the inner end of the tail plug 15 of the cylinder lock 12 mounted on the outer surface side of the door 1.

As shown in FIG. 5, the tail piece 16 is a member having a substantially horizontal T-shape in cross section.
An operation plate 16a for engaging and disengaging with the clutch hole 8 (see FIG. 4) for rotating the darma shaft 9, and an operating pin 1 described below.
7 is integrally combined with a pin guide 16b that guides the pin 7.

The reason why the tail piece 16 is formed asymmetrically as shown in the figure is that the inner cylinder of the cylinder lock 12 or the rotation center O of the thumb turn shaft 5 and the operating pin 17 or the keyhole 18 of the cylinder lock (FIG. 1) This is because they are shifted in the vertical direction in the illustrated embodiment, and are not essential components of the present invention.

One end of an operating pin 17 is inserted into the inner end of the keyhole 18 such that the tail piece 16 is inserted from the indoor side so as to be movable in the length direction.

As shown in FIG. 1, a retaining ring 6 can be fitted to the inner end of the operating pin 17 to prevent the operating pin 17 from coming out of the key hole 18 to the outside of the room.

At the time of locking, the engagement projection 13 engages with the engagement recess 4 formed in the thumb-turn guide cylinder 2, and is held on the bottom surface of the engagement recess by the elastic force of the biasing spring 11. The dimensions of the respective parts are set so that the inner end face of the shaft 5, that is, the inner end face of the connecting piece 7 and the inner end of the operating pin 17 lightly abut or face each other with a slight gap.

In FIG. 3, reference numeral 8a denotes a cutout formed in the clutch hole 8 to avoid interference with the pin guide 16a (see FIG. 5) of the tailpiece. , Rotate the inner cylinder 90
4, the lock is turned by 90 degrees counterclockwise in FIG. 4, the key is pulled out by turning back 90 degrees, the inner cylinder is turned 90 degrees clockwise in FIG. 4 to unlock, and then turned back by 90 degrees. An operation of pulling out a key shall be performed.

In the safety device according to one embodiment of the present invention configured as described above, at the time of locking, the door is locked to the door frame by a dead bolt projecting from the lock box (not shown) to the strike plate side. As shown in FIG. 1, the engagement projection 13 on the indoor side is engaged with the locking recess 4 (see FIG. 2) of the thumb-turn guide cylinder.

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 deadbolt via the dharma shaft 9 collides with the thumb-turn guide cylinder 2 through the engagement between the engagement projection 13 and the engagement recess 4. And the cylinder lock cannot be turned any further.

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 inserts the duplicate key 19 into the keyhole of the cylinder lock 12 as shown in FIG.
9 pushes the operating pin 17 inward, so that the other end (inner end) pushes the thumb-turn shaft 5 inwardly of the room against the elasticity of the biasing spring, and the locking recess of the thumb-turn guide shaft 2 4 and the engagement protrusion 13 of the thumb turn shaft is released, and the tail piece 16 is rotated clockwise in FIG.

In this case, in the illustrated embodiment, the operating pin 1
The other end of 7 pushes slightly above the center of FIG. 3 instead of the center of the connecting piece 7, but does not affect the basic operation.

Then, since the Dharma shaft 9 becomes free, the tail piece 16, the Dharma shaft 9 and the thumb-turn shaft 5 are rotated in the unlocking direction while being integrally connected in the circumferential direction, and the dead bolt is locked. Retract into the box.

In the illustrated embodiment, since the key is pulled out by turning it 90 degrees back, the engaging recess 4 and the engaging projection 13 are engaged again by the elastic force of the urging spring 11.

On the other hand, when the duplicate key is turned 180 degrees in the unlocking direction and the duplicate key is removed at that angular position, the engagement projection 13
Rides on the indoor side end surface of the thumb-turn guide cylinder 2 at an angle position 180 degrees away from the locking recess 4.

When locking for going out, since the duplicate key is also inserted into the keyhole, the engagement between the thumb turn shaft 5 and the thumb turn guide cylinder 2 is released, so that the locking operation is not adversely affected.

When unlocking by operating the thumb turn from inside the room after unlocking, the knob 14 is slightly pulled to release the engagement between the locking recess 4 and the engaging projection 13 and then the thumb turn shaft 5 is turned in the locking direction. Turn to.

In carrying out the present invention, the present invention is not limited to the illustrated embodiment, but can be implemented in various modifications.

For example, in the illustrated embodiment, the engaging projection 13 is formed on the thumb-turn shaft 5 and the locking recess 4 is formed on the thumb-turn guide cylinder 2. However, this is reversed by changing the shape of the member. be able to.

Although the cylinder lock in the illustrated embodiment is a so-called lever tumbler lock, the present invention is not limited to the lever tumbler lock, but can be applied to a disk tumbler lock, a pin tumbler lock or a magnet tumbler lock.

[0041]

As is apparent from the above description, according to the present invention, the thumb turn shaft is fixed by the engagement of the engaging projection and the locking concave portion at the time of locking, and the tip of the double key is inserted at the time of insertion into the keyhole. As a result, these engagements are released via the operating pin, so that even if the cylinder lock is unlocked by picking, the deadbolt cannot be retracted, and therefore, the picking is invalidated and the safety of the lock is markedly improved. This has the effect of being able to be improved.

[Brief description of the drawings]

FIG. 1 is a partially sectional side view showing a main part of a safety device according to an embodiment of the present invention, showing a locked state.

FIG. 2 is a partial cross-sectional side view showing a main part of a safety device according to an embodiment of the present invention, showing a state in which a duplicate key is inserted into a keyhole of a cylinder lock.

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

FIG. 4 is an enlarged partial cross-sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is an enlarged end view of the tailpiece.

[Explanation of symbols]

 2 Thumb turn guide cylinder 4 Locking recess 5 Thumb turn shaft 7 Connecting piece 8 Clutch hole 9 Dharma shaft 11 Energizing spring 12 Cylinder lock 13 Engagement protrusion 16 Tailpiece 17 Operating pin 18 Keyhole 19 Double key

Claims (1)

[Claims] 1. A thumb turn shaft rotatably and longitudinally guided by a thumb turn guide cylinder and urged in a direction approaching a cylinder lock, and an engagement projection on one of the thumb turn guide cylinders. On the other hand, a locking concave portion is formed on the other side to engage with the engaging protrusion and prevent its movement in the circumferential direction.
On the other hand, one end of the operating pin is inserted movably in the length direction from the inside into the inner end of the keyhole of the cylinder lock, and the other end of the operating pin faces the inner end of the thumb turn shaft.
Engage the engagement projection with the engagement recess to prevent the thumb-turn shaft from rotating, and when unlocking, push out the operating pin with the tip of the duplicate key in the axial direction of the thumb-turn, and remove the engagement protrusion from the engagement recess. A safety device characterized in that: