JPH0145310Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a cylinder lock.

Cylinder locks rotate the rotor by inserting a key into the keyway of the rotor, pushing the pin back, and aligning the butting end of the pin with the contact line between the outer circumference of the rotor and the inner circumference of the cylinder case. However, there was a problem in that the lock had to be unlocked by inserting a thin plate with uneven edges and pushing the pin back while tilting the thin plate.

This invention aims to eliminate the above-mentioned drawbacks by making it impossible to unlock even if the pin is pushed back and the butting end of the pin is located on the line of contact between the inner periphery of the cylinder case and the outer periphery of the rotor. There is.

This idea provides a groove inward from the inner end surface of the rotor that communicates with the keyway, and a slide plate that slides in the outer circumferential direction of the rotor is fitted into this groove, and the inner bottom surface of the cylinder case To provide a cylinder lock in which a recess into which the lower edge of a slide plate fits is provided, and the slide plate is pushed up so that the lower edge of the slide plate escapes from the recess with the tip of a key inserted.

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

In the figure, A is a cylinder lock, and the cylinder lock A is inwardly connected to the keyway 2 in the rotor 1 from the inner end surface of the rotor 1.
A groove 3 is provided in which the lower side of the outer periphery is open.

Further, the plate-shaped body 4 that slides into the groove 3 is fitted, and a recessed portion 5 is provided on the bottom surface of the cylinder case 11, into which the lower edge of the plate-shaped body 4 is fitted.

Furthermore, a V-shaped notch 6 is provided on the inner edge of the plate-like body 4, into which the tip of the key a fits and allows the lower edge of the plate-like body 4 to escape from the recessed portion 5.

In the figure, 7 is a piece protruding from the front edge of the plate-like body 4, and this piece 7 is fitted into a notch 9 of a rotating body 8 of the lock piece. 10 is a disc fixed to the rotor 1 via screws 11' so as to close the inner end of the cylinder case 11;
2 is provided.

The cylinder lock according to this invention has the above-mentioned structure, and its operation will be explained next. When the key a is not inserted into the keyway 2, the plate-shaped body 4
has descended and the lower edge of the plate-like body 4 is fitted into the recessed part 5, so the abutting end of the pin 13 is aligned with the contact line between the inner periphery of the cylinder case 11 and the outer periphery of the rotor 1. Even if an attempt is made to rotate the rotor 1, the plate-like body 4 prevents the rotor 1 from rotating.

Next, when the key a is inserted into the keyway 2, the tip of the key a fits into the notch 6 and pushes up the plate 4, so that the lower edge of the plate 4 escapes from the recess 5.

At this time, the abutting ends of the pins 13 are located at the contact lines between the inner periphery of the cylinder case 11 and the outer periphery of the rotor 1, so the rotor 1 can be rotated by the key a.

As described above, according to the cylinder lock of this invention, when the key is inserted into the keyway and the tip of the key is pushed into the notch to push up the plate-like body, the lower edge of the plate-like body is inserted into the recessed part. Therefore, even if the abutting end of the pin is aligned with the line of contact between the outer periphery of the rotor and the inner periphery of the cylinder case, the rotor cannot be rotated.

Therefore, unlocking using a key other than the dedicated key is prevented.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of the cylinder lock according to this invention, FIG. 2 is a partially cutaway rear view of the cylinder lock, and FIG. 3 is a longitudinal sectional side view of the plate-shaped body pushed up by a key. A...Cylinder lock, a...Key, 1...Rotor, 2...
Keyway, 3... Groove, 4... Plate-shaped body, 5... Recessed part, 6...
Notch portion, 7... piece, 8... retractable rotating body, 9... notch, 10... disc, 11... cylinder case.

Claims (1)

[Scope of utility model registration request] A groove is provided in the cylinder lock that communicates with the key groove inward from the inner end surface of the rotor and opens the outer circumferential bottom surface of the rotor, and a sliding plate is fitted into the groove. A recess into which the lower edge of the plate-like body fits is provided on the inner bottom surface, and a notch that pushes up the plate-like body so that the tip of the key fits into the front edge of the plate and the lower edge escapes from the recess. A cylinder lock with a section.