JPH0725416Y2 - Cylinder lock - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a cylinder lock, and more particularly to a cylinder lock that prevents unauthorized unlocking due to removal of a key cylinder.

Cylinder locks are used in various fields including construction and vehicles, and include a case, a key cylinder arranged in the case, and a lever attached to an inner end of the key cylinder and operatively connected to a locking device. Have. The key cylinder is provided with a plurality of tumblers urged to the outside of the key cylinder by tumbler springs. By inserting a specific key into the key cylinder, the tumbler is pulled into the key cylinder, and the key can be rotated and unlocked.

As a material for the case and the key cylinder, zinc die casting, which is easy to form and has sufficient breaking strength, is often used. The case and key cylinder made of zinc die casting are
It is formed by casting molten zinc in a cavity of a mold under pressure. In this case, when the cast product becomes large, the "bathroom" deteriorates, and unfilled portions such as cavities or voids are likely to occur in the cast product. In order to prevent the occurrence of such unfilled parts, the maximum length of cast products is usually set to about 30 mm.

For example, an automobile door lock device disclosed in Japanese Examined Patent Publication No. 55-50147 uses a cylinder lock provided with a key rotor and a rear rotor in a casing. By inserting the key into the key rotor and rotating it, the door of the automobile can be locked or unlocked.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the above cylinder lock, a pressing body is movably arranged in a casing, and a key rotor is provided inside the pressing body. The key rotor is held inside the pressing body by a metal cover. The cover is formed by pressing a thin stainless steel plate. However, since this cover is thin,
It has the drawback of being easily destroyed. Therefore, in the conventional cylinder lock having the rear rotor, the cover can be easily unlocked by breaking the cover with a tool, taking out the key rotor, and rotating the rear rotor, so that theft cannot be sufficiently prevented. On the other hand, as described above, in the zinc die casting, there is a problem that the key rotor and the rear rotor cannot be integrally cast because the length of the cast product is limited.

Therefore, an object of the present invention is to provide a cylinder lock that solves the above-mentioned drawbacks and has improved bias unlocking prevention performance.

Means for Solving the Problems A cylinder lock according to the present invention is provided with a case, a key cylinder having one end arranged in the case and provided with a key hole, and arranged in the case and coaxial with the key cylinder. A rotor and a lever attached to one end of the rotor and operably connected to the locking device. The step provided on the key cylinder or the rotor and the step provided on the case come into contact with each other to prevent the key cylinder from moving inward in the axial direction. In addition, a protruding portion that engages with the receiving portion provided at the other end of the rotor is formed so as to radially protrude at the other end of the key cylinder, and the rotational force of the key cylinder is applied to the rotor by the engagement between the receiving portion and the protruding portion. At the same time as transmitting, the contact between the lever and the case prevents the key cylinder from moving outward in the axial direction. A protrusion having the same shape as the protrusion provided on the other end of the key cylinder is provided on one end of the rotor.

Action Since the protrusion provided on the other end of the key cylinder and the protrusion provided on one end of the rotor have the same shape, there is an advantage that the conventional key cylinder can be used as it is without changing the design. Further, when the key cylinder and the rotor are arranged in the case, the receiving portion provided at the other end of the rotor is engaged with the projecting portion provided at the other end of the key cylinder and then inserted into the case.
When the key is inserted into the key hole of the key cylinder and rotated,
The rotation of the key cylinder is transmitted to the rotor by the engagement between the receiving portion and the protruding portion. Further, the key cylinder is connected to the rotor and the lever is brought into contact with the case to prevent the key cylinder from moving outward in the axial direction. Therefore, even if the cover provided on the front part of the key cylinder is removed, the key cylinder cannot be taken out from the case, and the unauthorized unlocking of the door is prevented.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

As shown in FIG. 1, in the cylinder lock of the present invention, a case 10, a key cylinder 30 having one end arranged in the case 10 and provided with a key hole 34, and a key cylinder arranged in the case 10 are provided. Rotor 20 installed coaxially with 30
And a lever 51 to which a rod attached to one end 26 of the rotor 20 and connected to a lock device (not shown) is connected. The lever 51 is connected to one end of the rotor 20 by the E ring 52.
It is attached to a protrusion 27 provided on 26. One end of the return spring 50 is attached to the lever 51, and the other end of the return spring 50 is fixed to the case 10. The return spring 50 applies an elastic force that returns the lever 51 to the initial position before rotation when the key cylinder 30 is rotated in the unlocking direction.
Give to.

The case 10 has a front sleeve 14, a flange 11 that projects radially from the front sleeve 14, and a rear flange 15 that extends rearward from the flange 11. The flange 11 is formed with a hole 11a for attaching the case 10 to an automobile (not shown).
Further, although the cover 40 is mounted on the front sleeve 14, the protrusion 13 that prevents the cover 40 from rotating is provided. The rear sleeve 15 is provided with a protrusion 16 for fixing a clip (not shown).

The rotor 20 further includes a rotor body 21, a protrusion 27 provided at one end 26 of the rotor body 21 and supporting the lever 51, a recess 24 provided at the other end 23 of the rotor body 21, and a further end 23. It has an engaging portion 25 forming a receiving portion 25a as a through hole. A thinned portion 22 is formed in the rotor body 21 for weight reduction.

The key cylinder 30 includes a cylinder body 31, a head portion 33 provided at one end of the cylinder body 31, and the other end of the cylinder body 31.
It has a protrusion 36 protruding from 35 and inserted into the recess 24 of the rotor body 21, and a key hole 34 formed in the head portion 33 and the cylinder body 31. As is well known, the cylinder body 31 has a tumbler groove 32a in which a plurality of tumblers 32 are mounted. A projecting portion 37 that projects radially outward is formed at one end 35 of the cylinder body 31.

At the time of assembly, the protruding portion 37 is fitted into the receiving portion 25a of the rotor 20, and the rotor 20 and the key cylinder 30 are mounted inside the case 10. When mounted in the case 10, the stepped portion 23a of the rotor body 21 contacts the stepped portion 17 of the case 10, and the stepped portion 32b of the cylinder body 31 contacts the stepped portion 18 of the case 10. Therefore, movement of the rotor 20 and the key cylinder 30 inward in the axial direction is prevented. Further, since the lever 51 contacts the case 10, the rotor 20 and the key cylinder 30 are prevented from moving outward in the axial direction.

In the above configuration, when the key K is inserted into the key hole 34 of the key cylinder 30 against the elasticity of the return spring 50 and rotated, the key cylinder 30 rotates due to the engagement between the receiving portion 25a and the protruding portion 37. Is transmitted to the rotor 20. After that, the key K is automatically returned to the initial position by the return spring 50. When the key cylinder 30 is illegally pulled out by removing the cover 40, the key cylinder 30 is connected to the rotor 20, and the lever 51 abuts the case 10 to prevent the key cylinder 30 from moving outward in the axial direction. To be prevented. Therefore, even if the cover 40 provided on the front portion of the key cylinder 30 is removed, the key cylinder 30 cannot be taken out from the case 10, and thus the unauthorized unlocking of the door is prevented. In addition, since the protrusion 37 of the key cylinder 30 and the protrusion 27 for attaching the lever 51 of the rotor 20 have the same shape, the conventional key cylinder can be used as it is without changing the design.

Although the cylinder lock attached to the back door of the automobile has been described in the above embodiments, the present invention can be applied to a door or an opening / closing portion of a closed portion of a vehicle other than an automobile or a building.

Effect of the Invention As described above, according to the present invention, it is possible to prevent unauthorized removal of the key cylinder, and thus there is an advantage that unauthorized intrusion or theft can be prevented. Further, since the protrusion of the key cylinder and the protrusion of the rotor have the same shape, the conventional key cylinder can be used as it is, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of a cylinder lock according to the present invention showing an embodiment attached to a back door of an automobile, and FIG. 2 is an exploded perspective view thereof. 10 …… Case, 20 …… Rotor, 30 …… Key cylinder, 34
…… Key hole, 51 …… Lever, 23a, 32b …… Step, 25a ……
Receiving part, 27,37 ... Projection part,

Claims (1)

[Scope of utility model registration request] 1. A case, a key cylinder having one end arranged in the case and provided with a key hole, a rotor arranged in the case and coaxial with the key cylinder, and attached to one end of the rotor. And a lever that is operatively connected to the lock device, the step portion provided on the key cylinder or the rotor abuts the step portion provided on the case, and prevents the key cylinder from moving inward in the axial direction. A protrusion that engages with the receiving portion provided at the other end of the key cylinder is formed at the other end of the key cylinder so as to project in the radial direction, and the rotational force of the key cylinder is transmitted to the rotor by the engagement between the receiving portion and the protruding portion. In a cylinder lock that prevents the key cylinder from moving outward in the axial direction by contact between the lever and the case, a protrusion having the same shape as the protrusion provided at the other end of the key cylinder is provided at one end of the rotor. You Cylinder lock.