JP2001234648A - Cylinder lock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it hard to be illegally unlocked by improving a groping preventive function on a cylinder lock furnished with a plate tumbler. SOLUTION: An engagement part 7 with a key 12 attached with a height difference in accordance with a gage is provided to one side of an insertion hole 6 of the key furnished at a central part of a plate tumbler 5, and a coil spring 8 to energize in the locking direction from below the central part of the tumbler is made contact with it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder lock in which a plurality of plate tumblers, each of which can be freely raised and lowered, and which can be freely moved into and out of the outer periphery, are inserted in a lock body in multiple stages along the axial direction. A key engaging portion provided in the insertion hole of the key provided is formed so as to be offset toward one side of the insertion hole, thereby strengthening a search prevention against an illegal unlocking operation. It is.

[0002]

2. Description of the Related Art Conventionally, a cylinder lock provided with a plate tumbler of this type generally has a key engaging portion provided on the tumbler side in accordance with the count of the lock, and a key having a vertically long opening inserted into the center of the tumbler. Since it was formed in the center of the hole, insert several pieces of the plate through the keyhole to bring the tip into contact with each engaging part formed in the cylinder lock, and open each plate tumbler. There is a drawback that the search operation for aligning with the lock position can be easily performed and the lock is easily opened illegally. In addition, a coil spring that constantly biases the plate tumbler in the locking direction was in contact with one side of the tumbler and was inserted into the lock body to bias the tumbler from one side. Was one of the factors that made it easier.

[0003]

The problem to be solved by the present invention is to prevent the illegal unlocking operation as described above, thereby improving the safety of locking a cylinder lock having a plate tumbler. To improve it.

[0004]

That is, the present invention relates to a cylinder lock in which a plurality of plate tumblers, which can be freely moved up and down and moved in and out of the outer periphery, are inserted into a lock main body. A coil provided with an engaging portion with a key which is shifted to one side of a key insertion hole provided and provided with a height according to the count, and supported by a spring receiving portion provided along the center of the bottom of the lock body. The present invention provides a cylinder lock characterized in that a central portion of a tumbler is abutted against a spring to be constantly urged in a rising direction.

According to a second aspect of the present invention, in order to facilitate the use of the cylinder lock having the above-described configuration, the insertion hole provided in each plate tumbler is formed in a rectangular shape along the upper side of the horizontal center line. On the other hand, the key is provided with an unlocking portion having a rectangular cross section substantially the same as the insertion hole, and having a height difference corresponding to each engaging portion of the tumbler at symmetrical positions on both upper and lower surfaces. The reversible key provided is used.

Further, according to the invention of claim 3, the key formed into a rectangular cross section as described above is located at symmetrical positions on both upper and lower surfaces.
A guide groove having a rectangular cross section is provided in parallel with the unlocking portion with the center line in the longitudinal direction interposed therebetween, while the insertion hole of the plate tumbler inserted at a position adjacent to the opening of the lock body has the above-mentioned structure. Protrusions having substantially the same cross section for fitting the guide grooves are provided at corresponding positions, or the protrusions are directly provided on the inner peripheral surface of the opening of the lock body, or the protrusions are provided. The reversible key is inserted into the guide groove and the projection by inserting another part inside the opening.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of the embodiment, FIG. 2 is a sectional view showing an unlocked state by inserting a key, and FIG. 3 is a sectional view showing a locked state. In FIG. 1, reference numeral 1 denotes a lock body provided with slits 2 on the upper surface in multiple stages in the axial direction, an opening 3 provided on an end surface on the near side, and a square shaft 4 provided on the distal end surface.
A total of seven plate tumblers before and after being inserted into the lock main body 1 so as to be able to move up and down and in and out freely, 6 is an insertion hole of a square key provided in each plate tumbler 5, and 7 is one side of the insertion hole 6. (The left side in the figure) is an engagement portion with a key that is provided to be offset.

As shown in FIGS. 1 and 2, the engaging portion 7 has a height difference 7h, 7h according to the count as in the conventional plate tumbler.
m, 7l, but provided on one side of the insertion hole 6, the contact position of the key 12 with the unlocking portion 14 on the plate tumbler 5 side is unilateral, and the predetermined width and height For keys other than the key having the unlocking portion 14, a high search-inhibiting effect is achieved.

The lock 8 is inserted into an insertion opening 9 vertically provided at the center of the slit 2 so that a lower end is supported by a spring receiving portion 10 provided at the center of the bottom of the lock body 1 as shown in FIG. The plate tumblers 5 are attached to the inside of the lock main body 1 so as to be engaged with the spring supports 11 below the rectangular insertion holes 6, that is, at the center of the respective plate tumblers 5, and to urge the respective plate tumblers 5 upward from the bottom. Coil spring. The coil spring 8
Urges the central portion of each tumbler 5 from below to make it more difficult to find the unlocked position of the tumbler 5 having the one-handed engaging portion 7.

As shown on the left side of FIG. 1, a key 12 inserted into the lock body 1 is provided on one side of an insertion portion 13 having a rectangular cross section substantially the same as the insertion hole 6 of each plate tumbler 5. The unlocking portion 14 that comes into contact with the engaging portion 7 of the plate tumbler 5,
A guide groove 16 having a square cross section is provided continuously on the other side of the center line in the length direction with the slope section 15 interposed therebetween. The unlocking portion 14 and the guide groove 16 are also provided at symmetrical positions on the upper and lower surfaces of the key 12 in the drawing, that is, symmetrical positions on the back side (not shown). It is formed in a reversible type without.

In FIG. 1, reference numeral 17 denotes a cover member fitted to the left end face of the lock body 1 in the figure, and 18 denotes a cover member which is provided on the cover member 17 and which is located below the opening 3 of the lock body 1.
2 is a keyhole provided to be openable and closable from the inside by a shutter 19 interposed therebetween.

The plate tumbler 5a on the left end side in FIG. 1 is inserted into the slit 2 closest to the inside of the opening 3 provided on the left end surface of the lock body 1, and is connected to the guide groove 16 on the key 12 side. At the corresponding position, upward and downward convex portions 20 having substantially the same rectangular cross section are provided at symmetrical positions sandwiching the center of the insertion hole 6 so that the reversible key 12 is inserted into the guide groove 16 and the convex portion. 20 are guided. The projection for guiding the key 12 as described above is not limited to the case where the projection is provided on the plate tumbler 5a. For example, as shown by the imaginary line in FIG. 1, the protrusion 20 ′ is directly provided on the inner peripheral surface of the opening 3 of the lock body 1, or another part having the protrusion is provided in the opening 3. In some cases, it is attached to the inside.

The plate tumbler 5b inserted into the slit 2 near the right end face in the drawing of the lock body 1 is provided with the lock body 1 as shown in FIGS.
Has a stopper function of preventing the lock main body 1 from coming off in the lock case 21 into which the lock body 21 is fitted.

As described above, each plate tumbler 5 provided with a key engaging portion 7 which is biased to one side of the insertion hole 6 is provided with the keyhole 1.
When a flat plate or the like is inserted to open the lock illegally from the position 8, the contact with the engaging portion 7 is made difficult to find by forming the insertion hole 6 as narrow as possible in comparison with the width of the insertion hole 6.
Further, each plate tumbler 5 is moved from below the central portion by a coil spring 8.
This also makes it difficult to find contact with the engaging portion 7.

The shape of the plate tumbler according to the present invention,
The shape of the insertion hole, the width of the engaging portion, and the like are not limited to the embodiments, and it goes without saying that the design can be arbitrarily changed according to the gist of the present invention.

[0016]

According to the present invention configured as described above and used as described above, the engaging portion provided on the tumbler with a height difference according to the count is provided in the key insertion hole. By disposing the tumblers at one side and biasing the center of each tumbler from below by a coil spring, it is possible to make it more difficult to find the unlocked position of the plate tumbler in the locked state, and this type of cylinder lock Can significantly improve the lock reliability.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an embodiment.

FIG. 2 is a partially cutaway enlarged sectional view showing an unlocked state of a plate tumbler.

FIG. 3 is a partially cut-away enlarged sectional view showing a locked state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lock main body 2 Slit 3 Opening 4 Square axis 5 Plate tumbler 6 Insertion hole 7 Engagement part (7h, 7m, 7l) 8 Coil spring 9 Insertion opening 10 Spring receiving part 11 Spring receiving 12 Key 13 Insertion part 14 Unlocking part 15 Slope 16 Guide groove 17 Cover member 18 Keyhole 19 Shutter 20 Convex part (20 ') 21 Lock case 22 Restoring spring

Claims (3)

[Claims] 1. A cylinder lock in which a plurality of plate tumblers capable of ascending / descending and moving in and out of the outer periphery are inserted into a lock body, wherein each plate tumbler has a key insertion hole provided in common with each other. One side is provided with an engaging portion with a key with a height depending on the count, and the central portion of the tumbler abuts a coil spring supported by a spring receiving portion provided along the center of the bottom of the lock body The cylinder lock is configured to be constantly biased in the ascending direction. 2. Each of the plate tumblers is provided with the insertion hole in a rectangular shape along the upper side of a horizontal center line, while the key has a rectangular cross section substantially the same as the insertion hole, and 2. The cylinder lock according to claim 1, wherein the cylinder lock is formed as a reversible type having unlocking portions each having a height difference corresponding to each engaging portion of the tumbler at symmetrical positions on both upper and lower surfaces. 3. The key has an insertion guide groove for a key parallel to the unlocking portion across a center line in a longitudinal direction at symmetrical positions on both upper and lower surfaces, and an opening in the lock main body. In the insertion hole of the plate tumbler inserted at an adjacent position, a convex portion having a substantially same cross section for fitting the guide groove is provided at a corresponding position, or a convex portion is formed on the inner peripheral surface of the opening of the lock body. Part is provided directly, or another part provided with the convex part is attached inside the opening so that the insertion of the reversible key is guided by the guide groove and the convex part. The cylinder lock according to claim 2, wherein the cylinder lock is constituted.