JP3059563U - Drill break prevention locking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drill breakage prevention lock device in which a guard function is accurately maintained without a guard means being violently removed by a pinching tool. SOLUTION: In a lock device in which a rotor 2 is rotatably housed in a fixed case 1 and the rotor 2 is restrained from being rotated by a tumbler lock mechanism 3, a guard disk of high hardness is used for the entire front portion of the fixed case 1 and the rotor 2. The side wall portion 4b of the guard disk 4, which is covered with the front wall portion 4a and is exposed to the outside during use, is formed in a truncated cone shape whose diameter decreases toward the front wall portion 4a. The guard disk 4 is rotatably connected to the fixed case 1 by a retaining ring 25 engaged with the inner surface receiving groove 6 of the fixed case 1 and the outer surface receiving groove 7 of the front end cylindrical portion 1 a of the fixed case 1. A communicating hole 26 is provided in the front wall 4a of the guard disk 4.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention pertains] 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 housed in a fixed case and the rotor is restrained from rotating by a tumbler lock mechanism, a lock made of hard material is used. A plate covers the front surface of the rotor including the keyhole, and a short cylindrical cover made of a hard material covering the closing plate is attached to the fixed body. When a drill bit hits 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 device, 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 provided in the inner wall at the front end of the screw hole in the radial direction, and the through hole is moved. The cover is fixed by pressing the inserted steel ball with the tapered end of a set screw screwed into the screw hole to engage a part of the steel ball with the concave groove on the inner surface of the side wall of the cover. It is attached to the main body.

[0004] As described above, the cover is in the shape of a short cylinder having a relatively small thickness, and the peripheral wall is formed parallel to the center axis. As a result, the pinching tool does not slip off, and the cover can be pinched with a necessary and sufficient force and strongly pressed in the centripetal direction. Due to this strong pressure, the peripheral portion of the concave groove or the through hole may be 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 plate is easily removed from the front of the rotor, so that the locking device completely loses the guard function and the drilling tool activates the tumbler locking mechanism. The housing part is punctured and destroyed.

[0005]

[Problem to be Solved by the Invention] Accordingly, an object of the present invention is to provide a drill destruction prevention type lock device in which a guard means is not violently removed by a pinching tool and a guard function is properly maintained. is there.

[0006]

According to the present invention, in a lock device in which a rotor 2 is rotatably accommodated in a fixed case 1 and a tumbler lock mechanism 3 restrains the rotor 2 from being rotated, the fixed case 1 and the rotor 2 is covered with a front wall portion 4a of a guard disk 4 of high hardness, and the side wall portion 4b of the guard disk 4 exposed to the outside during use has a truncated cone shape whose diameter decreases toward the front wall portion 4a. The guard disc 4 is fixed to the fixed case 1 by a retaining ring 25 engaged with the inner surface receiving groove 6 of the thick base end 4c of the guard disk 4 and the outer surface receiving groove 7 of the front end cylindrical portion 1a of the fixed case 1. 1, a through-hole 26 is provided in the front wall 4a of the guard disk 4 so as to be rotatably connected to the key hole 8 of the rotor 2.

When the thief tries to destroy the tumbler lock mechanism 3 with a drill tool and hits the drill bit 5 against the front wall 4 a of the guard disk 4 as shown in FIG. Since the drill bit 5 rotates together, the drill bit 5 is prevented from piercing the guard disk 4, and the drill bit 5 is prevented from approaching the tumbler lock mechanism 3.

When the authorized administrator unlocks the lock device, the guard disk 4 is appropriately rotated to align the through hole 26 of the guard disk 4 with the key hole 8 of the rotor 2, and then the key 9 is opened. Insert the key hole 8 through the hole 26.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In the illustrated embodiment, the guard disk 4 is made of a steel or ceramic material having sufficiently high hardness. The outer diameter of the guard disk 4 is the same as the outer diameter of the front surface of the fixed main body 1, and the outer diameter of the front end cylindrical portion 1 a of the fixed main body 1 is reduced by an amount equivalent to the thickness of the base end 4 c of the guard disk 4. I have. The retaining ring 25 is a C-shaped retaining ring made of steel. The front end tubular portion 1a of the fixed body 1 is fitted to the guard disc 4 with the diameter of the retaining ring 25 fitted in the outer surface receiving groove 7 reduced. At the moment when the inner surface receiving groove 6 of the guard disk 4 and the outer surface receiving groove 7 of the fixed body 1 face each other, the retaining ring 25 is elastically restored in the radially expanding direction and straddles both the inner surface receiving groove 6 and the outer surface receiving groove 7. To engage.

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

The front end flange 10 of the rotor 2 abuts against a retaining shoulder surface 11 on the front surface of the fixed body 1, and the C-shaped retaining ring 13 fitted into the annular receiving groove 12 of the rotor 2 is a rear end face of the fixed body 1. It is in contact with 14. 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 frustoconical guard ring 21 made of steel is fitted to the front end of the fixed body 1, and the fixed body 1 is fastened and fixed to the door panel 23 by the guard ring 21 and the nut 22.

[0012]

As described above, in the present invention, the guard disk 4 of high hardness, which covers the entire front surface of the fixed body 1 and the rotor 2 with the front wall portion 4a, has the side wall portion 4b exposed to the outside during use. Since it is formed in the shape of a truncated cone whose diameter decreases toward the front wall portion 4a, when the guard disk 4 is to be clamped from both sides in the diametric direction by the clamping tool, the clamping tool is inserted into the side wall portion 4b. It slips along, making it impossible to pinch itself. Even if the anti-slip means can be sandwiched, the inner surface receiving groove 6 with which the retaining ring 25 is engaged is formed in the thick base end 4c, so that the peripheral portion of the inner surface receiving groove 6 can be formed. It is impossible at all to push the retaining ring 25 into the outer surface receiving groove 7 of the fixed body 1 by distorting and deforming with the pinching tool. As a result, the lock device of the present invention cannot violently release the connection between the guard disk 4 and the fixed main body 1 to create a state in which the drill tool can be used effectively. A locking lock device is obtained.

[Brief description of the drawings]

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

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view of the lock device when a key is inserted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed main body 2 Rotor 3 Tumbler lock mechanism 4 Guard disk 5 Drill bit 6 Inner surface receiving groove of guard disk 7 Outer surface receiving groove of fixed body 8 Keyhole 9 Key 10 Front end flange of rotor 11 Fixed shoulder surface of fixed case 12 Rotor Annular receiving groove 13 retaining ring 14 rear end face of fixed case 15 rotor small-diameter shaft portion 16 washer 17 washer 18 rotation angle regulating plate 19 stopper plate 20 nut 21 guard ring 22 nut 23 door 24 spring retainer plate 25 stopper ring 26 guard Disc through-hole

Claims (1)

[Utility model registration claims] 1. A lock device in which a rotor 2 is rotatably accommodated in a fixed case 1 and the rotor 2 is restrained from rotating by a tumbler lock mechanism 3. The side wall portion 4b of the guard disk 4, which is covered by the front wall portion 4a of the disk 4 and is exposed to the outside during use, is formed into a truncated cone shape whose diameter decreases toward the front wall portion 4a. The guard disk 4 is rotatably connected to the fixed case 1 by a retaining ring 25 engaged with the inner surface receiving groove 6 of the portion 4c and the outer surface receiving groove 7 of the front end cylindrical portion 1a of the fixed case 1, and the key hole 8 of the rotor 2 is formed. Wherein a through hole 26 communicating with the guard disc 4 is provided in the front wall 4a of the guard disk 4.