JP2941714B2 - Drill break prevention locking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock device for preventing breakage of a drill in which a tumbler lock mechanism is not destroyed by drilling and a lock function is not lost.

[0002]

2. Description of the Related Art As disclosed in Japanese Patent Publication No. 58-44831, in a lock device in which a rotor is rotatably accommodated in a fixed case and the rotor is immovably restrained by a tumbler lock mechanism, a lock made of hard material is used. A plate covers the front part of the rotor including the keyhole, a short cylindrical cover made of a hard material covering the closing plate is attached to the fixed body, and when the drill bit is hit against the closing plate, Drill break prevention locking devices are known which prevent the drill bit from approaching the tumbler lock mechanism accommodating portion by rotating the closing plate with the drill bit.

In this conventional apparatus, a screw hole is provided in the axial direction from the back side of the fixed body, a through hole opened in the outer surface of the fixed body is formed in the inner wall of the front end of the screw hole in the radial direction, and the through hole is movable. The steel ball inserted into the screw hole is pushed by the tip taper portion of the set screw screwed into the screw hole, and a part of the steel ball is engaged with the concave groove on the inner surface of the side wall of the cover, so that the cover is fixed to the fixed body. Is attached.

[0004] As described above, the cover is a short cylindrical shape having a relatively thin thickness, and the peripheral wall is formed parallel to the center axis. Therefore, when the cover is sandwiched from both sides in the diametrical direction by a clamping tool. The cover can be clamped with a necessary and sufficient force and strongly pressed in the centripetal direction without the clipping tool slipping off. Due to this high pressure, the peripheral portion of the concave groove or the through hole is distorted and deformed, and the steel ball may be pushed into the screw hole to release the connection between the cover and the fixed body. When the cover is violently removed from the fixed body, the cover is easily removed from the front of the rotor, so that the locking device completely loses the guard function and is made of a normal metal material with low hardness. The drilled rotor is perforated by a drill tool, and the housing portion of the tumbler lock mechanism is broken.

[0005]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a drill destruction prevention locking device in which the guard function is permanently maintained without relying on guard means subject to violent removal. .

[0006]

According to the first aspect of the present invention ,
In a lock device in which the rotor 2 is rotatably accommodated in the fixed case 1 and the rotor 2 is non-rotatably restrained by the tumbler lock mechanism 3, the entire rotor 2 is made of a high hardness material.
The front part of the fixed body 1 in which the bra lock mechanism 3 is housed
A flange 10 to be coated is formed at the front end of the rotor 2 .
According to the second aspect of the present invention, in addition to the above configuration, the fixed case 1
A concave portion 4 for accommodating the flange 10 is provided on the front surface of the hologram.

[0007] A thief tries to destroy the tumbler lock mechanism 3 with a drill tool, and as shown in FIG.
When the drill bit 5 abuts against the front surface of the rotor 2, the high-hardness rotor 2 has no blade. Therefore, the drill bit 5 only idles while abutting on the front surface of the rotor 2.
The approach of the drill bit 5 to the tumbler lock mechanism 3 housed on the side is properly prevented.

A flange 10 is provided at the front end of the rotor 2
Therefore, the approach of the drill bit 5 to the tumbler lock mechanism 3 housed in the fixed main body 1 is accurately prevented.

When the entire flange 10 of the rotor 2 is accommodated in the concave portion 4 in the front portion of the fixed body 1, the rotor 10 is violently pulled out of the fixed body 1 by clamping the flange 10 with a pinching tool. 10 cannot be damaged by hitting it with a hammer or the like from the side.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated embodiment, a flange 2 is shown.
The whole of the rotor 2 including is made of a steel material or a ceramic material having sufficiently high hardness. The flange 10 is circular,
The tumbler lock mechanism 3 has a diameter such that the whole of the tumbler lock mechanism 3 is hidden behind. The concave portion 4 of the fixed main body 1 is also circular, and the peripheral side surface of the flange 10 is surrounded by the annular projection 1a of the fixed main body 1. A frusto-conical raised portion 6 is provided at the center of the front surface of the flange 10, and a guide groove 7 is provided in the raised portion 6 in a diametrical direction.

A well-known pin tumbler lock mechanism is used as the tumbler lock mechanism 3, and the driver pin 3b housed in the radial driver pin hole 3a of the fixed case 1 is
The compression coil spring 3e is in contact with the tumbler pin 3d housed in the tumbler pin hole 3c in the radial direction of the rotor 2.
Accordingly, the rotor 2 is urged to move in the direction of the keyhole 8 of the rotor 2. When the key 9 is properly inserted into the keyhole 8, the contact between the tumbler pin 3d and the driver pin 3b moves to the outer peripheral surface of the rotor 2, so that the constraint of the rotor 2 on the fixed case 1 is released, and the rotor 2 It becomes rotatable. As the tumbler lock mechanism, another lock mechanism such as a disk tumbler lock mechanism can be arbitrarily selected and used.

A flange 10 of the rotor 2 abuts against a retaining shoulder surface 11 on the front surface of the fixed body 1, and a C-shaped retaining ring 13 fitted in an annular receiving groove 12 of the rotor 2 is provided on a rear end face 14 of the fixed body 1. Abut. A rotation angle regulating plate 18 and a stopper plate 19 are fitted to a small-diameter shaft portion 15 of the rotor 2 via a washer 16 and a washer 17, and are fixed to the rotor 2 by a nut 20. A frustum-shaped guard ring 21 made of steel is fitted to the front end of the fixed body 1, and the fixed body 1 is fixedly fastened to a door 23 by the guard ring 21 and a nut 22.

[0013]

As described above, according to the first aspect of the present invention , the rotor 2 itself is made of a high-hardness material, and
The front part of the fixed body 1 in which the bra lock mechanism 3 is housed
The flange 10 to be coated is formed at the front end of the rotor 2.
To the tumbler lock mechanism 3 housed in the fixed body 1
The approach of the drill bit 5 is properly prevented.
In addition, the guard function is permanently maintained without relying on a separately provided guard means to be violently removed, and a drill destruction-prevention type locking device excellent in antitheft property can be obtained. Claims
In the invention of the second aspect, the recess 4 provided in the front portion of the fixed body 1
Since the entire flange 10 of the rotor 2 is housed,
Fix the rotor 2 by clamping the flange 10 with the tool
Violently pulling from the body 1 or pulling the flange 10 to the side
It can not be damaged by hitting with a hammer etc from the direction
No.

[Brief description of the drawings]

FIG. 1 is a front view when a key is removed from a lock device for preventing breakage of a drill according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of the lock device when a key is inserted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed main body 2 Rotor 3 Tumble lock mechanism 4 Recess 5 Drill bit 6 Front raised part of rotor 7 Guide groove of front raised part 8 Key hole 9 Key 10 Flange of rotor 11 Retaining shoulder surface of fixed case 12 Annular receiving groove of rotor 13 Retaining Ring 14 Rear End Surface of Fixed Case 15 Rotor Small Diameter Shaft 16 Washer 17 Washer 18 Rotation Angle Control Plate 19 Stopper Plate 20 Nut 21 Guard Ring 22 Nut 23 Door 24 Spring Holder Plate

Claims (2)

(57) [Claims] The rotor is rotatably housed in a fixed case.
And the rotor 2 cannot be rotated by the tumbler lock mechanism 3.
In the locking device for restraining, the entire rotor 2 is made of a high-hardness material.
In the prepared drill fracture-proof, characterized in that a flange 10 which covers the front portion of the stationary body 1 tumbler lock mechanism 3 is accommodated is formed in the front end portion of the rotor 2 JoSo
Place . 2. The lock device according to claim 1 , wherein a concave portion for accommodating the flange is provided on a front surface of the fixed case.