JP2001295516A - Cylinder lock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To have a number of key changes capable of being used for a cylinder lock. SOLUTION: A key hole 2 is formed along the center axis, at the same time, a plurality of slots 3 perpendicular to the center axis and connecting the insides of them to the key hole are laminated in both A and B regions confronting each other through the key hole along the center axis, the cylinder lock includes an inside cylinder 1 formed by slipping a pitch at every A and B region, an outside cylinde 7 fitted to the inside cylinder in a rotatable manner and a plurality of tumblers 4 and 4 guided in the direction of the width of a key 11 inserted into the key hole in a movable manner, energized in one direction and, at the same time, forming locking stage sections 6 in the inside end edge facing to the inside of the key hole, a duplicated key 11 is inserted into the key hole 2, and when key grooves 12 formed in shelves of the sides opposed to both A and B regions of the duplicated key are locked with the locking stage sections 6 from the other direction, both ends of each of the tumblers are aligned with a shear line as a sliding surface between the inside and outside cylindes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder lock, and more particularly to a novel cylinder lock capable of increasing the number of keys.

[0002]

2. Description of the Related Art There are various types of cylinder locks such as a pin tumbler lock, a disk tumbler lock, and a lever tumbler lock. The number of key differences depends on the number of tumblers in the cylinder lock and the number of keys in one tumbler. It is uniquely determined by how many steps are taken.

[0003]

However, the size of the cylinder lock in the direction of the keyhole axis cannot be made too large, and the tumbler is moved on the slope of the keyway when the key is inserted, so that the distance between the tumblers cannot be reduced. Therefore, the number of tumblers is limited to, for example, 7 to 8, and cannot be increased much.

Further, if the number of key steps in one tumbler is increased, the mechanical accuracy of the key and the cylinder lock must be improved. Therefore, the key is limited to at most about five steps. There was a disadvantage that the number of key differences in cylinder locks could not be so large.

Accordingly, an object of the present invention is to provide a novel cylinder lock in which the number of tumblers can be increased about twice as compared with the conventional one, and the number of key differences can be greatly increased.

[0006]

In order to achieve the above object, the present invention provides a keyhole formed along a central axis and a center area A and a center area B facing each other with the keyhole interposed therebetween. An inner cylinder formed by laminating a plurality of slots perpendicular to the axis and having an inner side communicating with the keyhole along the central axis and having a pitch shifted for each of areas A and B, and rotatably fitted to the inner cylinder; The outer cylinder and the respective slots are guided movably in the width direction of the key inserted into the keyhole in each of the slots, and are urged in one direction. A plurality of tumblers, each of which has a plurality of tumblers, wherein a duplicate key is inserted into a keyhole, and a key groove formed on a shelf on a side surface of the duplicate key opposite to a region of A or B, and a locking step of each tumbler and the other direction. When tumblers are engaged from each other, both ends of each tumbler align with the shear line, which is the sliding surface between the inner and outer cylinders Characterized in that the so that.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, reference numeral 1 denotes an inner cylinder. The inner cylinder 1 is a columnar body having a front large-diameter portion as a key guide, and has, for example, a flat rectangular key having a cross-sectional shape along a central axis thereof. The hole 2 penetrates.

In each of two regions A and B sandwiching the keyhole 2 of the inner cylinder 1, a plurality of slots 3, 3 perpendicular to the central axis and communicating with the keyhole 2 on the inside are formed along the central axis. They are formed by laminating at predetermined intervals.

As shown in FIG. 2, the slots in each of the areas A and B are formed so as to be shifted by a half pitch.

The reason why the slots are formed by shifting the pitches as described above is that if the pitches are the same, tumblers to be described later inserted into the slots come into contact with each other and interfere with each other.

As shown in FIG. 3, a tumbler 4 is housed in each slot 3, and is guided so as to be movable in the width direction (vertical direction in FIG. 3) of the key inserted into the key hole 2.

Each tumbler 4 is roughly rectangular in shape, and its elasticity of the tumbler spring 5 causes the tumbler 4 to move in one direction in its length direction (the area A in FIG. Is biased upward).

Further, a locking step 6 is formed on the inner edge facing the keyhole 2, and the locking step 6 faces in one direction (biasing direction).

The inner cylinder 1 constructed as described above is rotatably fitted to the outer cylinder 7 as shown in FIG.
Is stopped by a C-ring 8 fitted to the inner end of the.

In the illustrated embodiment, in order to make the operation (movement) of the tumbler 4 smooth, a portion of the outer cylinder 7 which is aligned with one end of each tumbler 4 at the time of locking shown in FIG. An elongated rectangular guide hole 9 having the same cross-sectional shape as the tumbler 4 is formed so as to penetrate the outer cylinder 7 (see FIGS. 3 and 4).

The reason why the guide holes 9 are opened intermittently in this way is to surely eliminate the deflection in the thickness direction of the end of the tumbler 4 engaged with the outer cylinder 1 beyond the shear line. Since most of the tumblers 4 are housed in the slots 3, if the dimensions of the slots in the axial direction of the inner cylinder are appropriately set, the deflection of the tumblers 4 in the plate thickness direction can be reduced. Instead of the troublesome intermittent guide holes 9, 9, these may form a continuous groove (see FIGS. 8 and 9).

On the other hand, a duplicate key 11 for unlocking the cylinder lock
Is configured as shown in FIG. 5 and FIG.

That is, the center of the side edge of the blade of the duplicate key 11 (the portion where the key groove is formed to be inserted into the keyhole) is left, and the side surface of the blade is cut in the width direction to lock one tumbler. One key groove bottom P engaging with the step 6 is formed.

The duplicate key 11 in the illustrated embodiment has a key 18
Since this is a so-called reversible key that can be inserted into the keyhole after being turned upside down by 0 °, one key groove bottom P is also formed at a position symmetrical with respect to the central axis of the duplicate key (blade).

Similarly, the key groove bottoms corresponding to the locking steps 6, 6 of the other tumblers are formed, and slopes are formed on both sides thereof to connect them to each other. A shelf having the groove 12 is formed.

As described above, the tumblers 4, 4 in the regions A, B of the inner cylinder 1 have opposite biasing directions, so that the key groove 12 above the side surface of the front blade in FIG.
Engages with the locking step 6 of the tumbler belonging to the area A, and the lower one engages with the tumbler belonging to the area B.

Further, since the tumblers 4 and 4 in the regions A and B are shifted by a half pitch, in FIG. 5, the key groove 12 above the side surface of the blade in front is also shifted by a half pitch.

Further, since the illustrated duplicate key 11 is a so-called reversible key, the same key groove as the key groove on the lower side of the front side of the blade in FIG. 5 is formed symmetrically on the upper back side of the blade.

When the duplicate key 11 is not inserted into the keyhole 2, the cylinder lock according to one embodiment of the present invention having the above-described structure is, as shown in FIG.
, One end of each tumbler 4 engages with the guide hole 9 of the outer cylinder 7 or a locking groove (not shown) and straddles the shear line. Keep the locked state without being able to rotate.

This is the same when a different key other than the duplicate key is inserted into the keyhole 2. It must be at least 1 for a different key
This is because one end of each tumbler straddles the shear line.

In the illustrated embodiment, the position of each tumbler 4 in the locked state is determined by an unnumbered projection that engages with the tumbler spring 5 abuts on the inner peripheral surface of the outer cylinder 7.

On the other hand, when the duplicate key 12 is inserted into the keyhole 2, as shown in FIG. 7, the locking step 6 of each tumbler engages with the corresponding key groove bottom of the key groove 12, and both ends of the tumbler are engaged. Are aligned with the shear line.

Therefore, when the double key is turned in this state, the inner cylinder 1 becomes rotatable relative to the outer cylinder 7.
The cylinder lock is unlocked.

The other points are the same as those of the conventional disk tumbler lock, for example, and the detailed description is omitted. 8 and 9 show a modified embodiment of the present invention. In this embodiment, the width of the guide hole 9 formed in the inner cylinder, that is, the dimension in the left-right direction in FIG. As shown, the width of the tumbler insertion end of the slot 3 is reduced, and the inner edge of the tumbler facing the locking step 6, that is, the inner edge of the narrow portion of the tumbler 4 is left uncut in the inner cylinder. 13. ＄ In this case,
When inserting the tumbler 4 into the slot 3, insert the tumbler obliquely.に With this configuration, the narrow portion and the wide portion of the tumbler 4 can be guided by the inner cylinder, so that there is another effect that the movement of the tumbler 4 in the inner cylinder is further smoothed. 8 and 9, reference numeral 14 denotes a locking groove formed by arranging the guide holes 9 and 9 and simultaneously closing the outer end thereof.
Has an advantage that it can be formed more easily than the guide holes 9 and 9.

[0030]

As is apparent from the above description, the present invention forms a keyhole along the center axis of the inner cylinder,
A plurality of slots perpendicular to the central axis and communicating with the keyhole are laminated along the central axis in two regions A and B facing each other with the keyhole interposed therebetween, and a pitch is set for each of the regions A and B. Since it is formed shifted, the number of tumblers can be approximately doubled, and the key difference of the cylinder lock can be significantly increased.

[Brief description of the drawings]

FIG. 1 is a front view of an inner cylinder of a cylinder lock according to an embodiment of the present invention.

FIG. 2 is a plan view thereof.

FIG. 3 is a sectional view taken along line III-III in FIG. 4, showing a locked state.

FIG. 4 is a plan view of a cylinder lock according to one embodiment of the present invention.

FIG. 5 is a side view of the duplicate key.

FIG. 6 is a sectional view taken along line VI-VI in FIG. 5;

7 is a cross-sectional view taken along the line VII-VII of FIG. 4, showing an unlocked state.

FIG. 8 is a sectional view similar to FIG. 3 showing a modified embodiment of the present invention, showing a locked state.

FIG. 9 is a sectional view similar to FIG. 7 showing a modified embodiment of the present invention, showing an unlocked state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner cylinder 2 Keyhole 3 Slot 4 Tumbler 5 Tumbler spring 6 Locking step 7 Outer cylinder 9 Guide hole 11 Duplex key 12 Keyway 13 Uncut portion 14 Locking groove

Claims (1)

[Claims] 1. A keyhole is formed along a central axis, and a plurality of slots A and B facing each other across the keyhole are provided with a plurality of slots perpendicular to the central axis and having an inner side communicating with the keyhole. An inner cylinder laminated along the axis and formed with a pitch shifted for each of the areas A and B, an outer cylinder rotatably fitted to the inner cylinder, and a slot inserted into the keyhole at each of the slots. A plurality of tumblers that are guided so as to be movable in the width direction of the key, are urged in one direction, and have a locking step formed on the inner edge facing the inside of the keyhole, and the duplicate key is formed in the keyhole. When the key groove formed on the shelf on the side opposite to the area A or B of the duplicate key is engaged with the locking step of each tumbler from the other direction, both ends of each tumbler are inner cylinder and outer cylinder. A cylinder lock characterized by being aligned with a shear line, which is a sliding surface with the cylinder lock.