JPS6010070A - Cylinder lock - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cylinder lock equipped with a lock breakage prevention structure.

For example, in the case of an automobile steering lock, the lock is broken by inserting a screwdriver into a key hole of the cylinder lock and destroying the tamp 2- in the locked position while forcibly rotating the rotor fully.

The present invention has been made with attention to the above-mentioned points, and in order to prevent such failure, a destructive part is provided at the front of the rotor that breaks due to the twisting moment when the lock is broken, and the breakage causes damage to the screwdriver, etc. By constructing the front portion of the rotor, which is engaged with the correct lock, as a rotating body, it is possible to prevent the tumbler from being destroyed and to provide self-defense against acts of failure.

An embodiment of the present invention will be described below. Reference numeral 1 denotes a lock body such as a steering lock, and a cylinder lock R is provided facing the opening 1a of the lock body.

As is well known, the cylinder lock R consists of a lock case 2 and a rotor 3, and when the lock is locked, a plurality of tumblers 4 arranged in the axial direction of the rotor 3 engage with the groove 21L of the lock case 2, and the rotor 3 Rotation is prevented, and from this state a key (not shown) is inserted into a key hole (not shown) of the rotor 3 to retreat the outer end of the tumbler 4 from the groove 2m into the rotor 3. The rotor 3 is rotated and the rod 5 is driven by the cam @31L to perform an unlocking operation. super on the front side of rotor 3.

A plurality of recessed thin portions 3b are formed in the circumferential direction.

In the above configuration, if you try to forcibly rotate the locked rotor 3 by inserting a screwdriver into the key hole, the thin part 3b will break due to the moment generated by the resistance of the tumbler 4, and only the head 3C will break. It rotates while being supported between the lock body and the lock case 2, which allows the tumbler 4 to
This prevents the lock from being broken while also preventing the destruction of the lock.

The head 3c may be structured to rotate within the lock case 2.

In the embodiment shown in FIG. 3, a thin walled portion 3'a formed by an annular groove is formed at the front end of the rotor 3'.

In each of the above embodiments, the rotor is provided with a thin-walled torsional breakage portion, but the present invention is not limited to this.

Since the present invention is constructed as described above, the cylinder lock has the feature of being able to handle lock-breaking actions by itself.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of one embodiment of the present invention, FIG. 2 is a perspective view of the rotor shown in the above, and FIG. 3 is a perspective view of another embodiment of the rotor. 3.3'...rotor, 3b, 3'
a... Torsional fracture part - Fig. 3 3゜

Claims (1)

[Claims] A cylinder lock characterized in that a tear 9 breakage part is provided on the front side of the rotor, which breaks due to the torsional moment generated by the resistance force of the tumbler during locking.