JPH0941742A - Cylinder lock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new cylinder lock which is difficult to pick. SOLUTION: An inner cylinder of a cylinder lock is divided into an outside end inner cylinder unit 11 having at least one tumbler 3 and a plurality of inner cylinder units which are adjacent to this outside end inner cylinder unit 11 and includes a second inner cylinder 12 having at least one tumbler 3 and a substantially triangle-shaped notched area 14, whose wide area precedes when the inner cylinder is turned in the unlocking direction, is formed on the outer peripheral part of an inner end face of the outside end inner cylinder unit 11. One end of a roller 15 is housed in this notched area 14, thereby constituting one way clutch and forming a recessed area 16 having a pair of end edges which clamps the other end in the circumferential direction at an angle position which substantially matches with the notched area 14 of the outer peripheral part of the outer end face of the second inner cylinder unit 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder lock including a pin tumbler lock, a disc tumbler lock and a lever tumbler lock (rotary disc tumbler lock), and in particular, a novel cylinder lock that prevents unauthorized unlocking by picking. Regarding

[0002]

2. Description of the Related Art A conventional cylinder lock is, for example, a disk tumbler lock, as shown in FIGS.
The outer cylinder 1 and the inner cylinder 2 are provided, and each of the plurality of tumblers 3 and 3 arranged in a row along the axis of the inner cylinder 2 is provided with a keyhole 4.
The key inserted in the key is moved in the radial direction by the corresponding key groove bottom, both ends thereof are aligned with the sliding contact surface (shear line) between the outer cylinder 1 and the inner cylinder 2, and the inner cylinder 2 is made rotatable. It is a thing.

In order to facilitate the explanation of the present invention to be made later,
The general structure thereof will be further described with reference to FIG. 5. For example, a key guide 5 having a larger diameter than that is attached to the outer end of the inner cylinder 2 (the left end in FIG. 5), and The inner end is narrowed to a small diameter and fitted into a hole (not shown) opened in the stopper plate 6, and a retaining ring 7 such as an E-ring is fitted.

5 and 6, reference numeral 8 is a locking groove formed on the inner surface of the outer cylinder 1, and reference numeral 9 is a tail piece for connecting the locking mechanism of a lock box (not shown) with the inner cylinder 2. Are shown respectively.

[0005]

However, it is known by some experts that the cylinder lock is not difficult to unlock by so-called picking.

In this picking, a thin tool is inserted into the inner cylinder 2 through the keyhole 4 (see FIG. 6), the inner cylinder 2 is slightly rotated in the unlocking direction while moving each tumbler 3, and the tip corner of the tumbler 3 is moved. This is done by placing the part on the shoulder 10 which is the intersection of the locking groove 8 and the shear line.

An object of the present invention is to provide a novel cylinder lock which makes it impossible to perform the above-mentioned illegal unlocking by picking.

[0008]

To achieve the above object, the present invention provides an inner cylinder of a cylinder lock, an outer end inner cylinder unit having at least one tumbler, and an outer end inner cylinder unit adjacent to the outer end inner cylinder unit. Then, the inner cylinder unit is divided into a plurality of inner cylinder units including the second inner cylinder unit having at least one tumbler, and the outer end inner cylinder unit has a wide portion when the inner cylinder is rotated in the unlocking direction on the outer peripheral portion of the inner end surface. Forms a substantially triangular notch, and one end of the trochanter is housed in this notch to form a one-way clutch, and an angle substantially aligned with the notch on the outer peripheral surface of the outer end surface of the second inner cylinder unit. It is characterized in that a concave portion having a pair of end edges for sandwiching the other end of the trochanter in the circumferential direction is formed at the position.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. The embodiment shown in FIGS. 1 to 3 applies the present invention to a so-called disc tumbler lock shown in FIGS. 5 and 6.

1 and 2, reference numeral 11 indicates an outer end inner cylinder unit, and reference numeral 12 indicates a second inner cylinder unit. These outer end and second inner cylinder units 11 and 12 are discs shown in FIG. The inner cylinder 2 of the tumbler lock is divided by a dividing surface 13 perpendicular to the central axis thereof, and each has at least one tumbler 3.

On the inner end surface of the outer end inner cylinder unit, that is, on the outer peripheral portion of the right end surface in FIG. 1, there is provided a one-way clutch that engages the trochanter.

That is, as shown in the figure, a part of one side surface (right side in FIG. 2) of the inner cylinder is left with a cylinder of a constant size in the length direction of the inner cylinder to form a thick portion. Cage, in this thick part,
As shown in FIG. 2, a notch 14 having a substantially triangular projection shape on a plane perpendicular to the central axis of the inner cylinder is formed.

The projection shape of the notch 14 on the plane perpendicular to the central axis of the inner cylinder is the outer end and the second inner cylinder unit 11, 1
When 2 rotates in the unlocking direction, the wide portion of the projected shape is set to precede. In the illustrated cylinder lock, the inner cylinder is rotated clockwise in FIG. 2 when unlocked.

In the illustrated embodiment, the projection shape of the notch 14 is set so as to consist of the distal end portion of the radius of the inner cylinder, half of the chord and part of the arc. When the inner cylinder, at least the outer end inner cylinder unit is rotated in the unlocking direction, the wide portion may be set to precede, and the shape is not necessarily limited to the illustrated shape.

One end portion (the left end portion in FIG. 1) of a trochanter 15 such as a roller having a short cylindrical shape is housed in the notch 14.

On the other hand, as shown in FIG. 1, the outer peripheral surface of the outer end surface (left end surface in FIG. 1) of the second inner cylinder unit 12 faces the notch 14 at an angular position substantially aligned with the notch 14. Thus, the concave portion 16 is formed (see FIG. 3).
reference).

Similar to the notch 14, the recessed portion 16 has a thick portion formed on one side surface near the outer end of the second inner cylinder unit 12 in a plane perpendicular to the central axis of the inner cylinder. For example, the projection shape is cut out so as to have a fan shape.

As shown in FIGS. 1 and 3, the other end portion (the right end portion in FIG. 1) of the trochanter 15 is housed in the recess 16 formed as described above, and as a result, the trochanter is formed. The other end of 15 is sandwiched in the circumferential direction by the edge forming the recessed portion 16, and moves integrally with the second inner cylinder unit 12 when it rotates.

In the cylinder lock according to the present invention having the above-mentioned structure, the outer end inner cylinder unit 11 and the second inner cylinder unit 12 are inserted in the ordinary locking / unlocking operation by inserting the not-shown key into the key hole 4. Since the keys are integrally connected to each other by this duplication key, they normally operate by locking and unlocking the duplication key.

It should be noted that the term "duplicate key" here does not mean a so-called spare key, but a key in which a regular key groove is formed on a shank in order to unlock the lock.

In order to unlock the cylinder lock by picking, the outermost tumbler of the outer end inner cylinder unit 11 is operated with a thin tool according to the picking method to unlock the outer end inner cylinder unit 11. Suppose you turn it in the direction.

Then, only the outer end inner cylinder unit 11 receives the turning force, and the second inner cylinder unit 12 stays at the angular position. As a result, the one-way clutch engages the rotator 15 and the outer end inner cylinder unit 11 The outer cylinder 1 is integrally connected.

In other words, one end (see FIG. 2) of the trochanter 15 whose other end is sandwiched by the recessed portion 16 is sandwiched between the vertical end edge of the notch 14 and the inner peripheral surface of the outer cylinder, The relative rotation between the outer cylinder 1 and the outer end inner cylinder unit 11 is prevented.

Therefore, the first step of picking in which the outer end inner cylinder unit 11 is slightly rotated and the tip of the outermost tumbler is placed on the shoulder portion 10 (see FIG. 6) of the outer cylinder inner peripheral surface is impossible. Of course, since the second and subsequent tumblers from the outside cannot be placed on the shoulder portion 10, the cylinder lock according to the present invention cannot be unlocked by picking after all.

On the other hand, during the normal locking / unlocking operation by the key, the outer end and the second inner cylinder units 11, 12 are operated by the key.
Are integrally connected via a key, and relative movement does not occur between the trochanter 15 and the notch 14 of the outer end inner cylinder unit, so that the notch 14 does not cause the trowel to be caught as described above. Is.

The present invention is not limited to the embodiment shown in the drawings, but can be modified in various ways.

For example, although the trochanter of the one-way clutch is a roller in the illustrated embodiment, it goes without saying that it may be a ball. In this case, if the depths (dimensions in the inner cylinder axis direction) of the notch 14 and the recessed portion 16 are set to be slightly larger than the radius of the ball, the play until the one-way clutch is activated is reduced.

In addition, unlike a lever tumbler lock shown in FIG. 4, an ordinary cylinder lock is not constructed by cutting the inner cylinder from a rod-shaped material, but a plurality of partition plates 17 are joined by a cylindrical retainer 18. , The key holes 4 are stacked in the length direction, and one end of a lever tumbler having a substantially C-shaped outer shape is rotatably supported in a slit between each partition plate 17 and another partition plate 17 adjacent to the inner cylinder. 2 may be configured.

In such a case, the outer end inner cylinder unit 1
The plate thickness of the partition plate at the inner end of 1 and the partition plate at the outer end of the second inner cylinder unit may be increased, and cutouts and recesses may be formed in them, respectively (not shown).

By the way, in the lever tumbler lock, the tumbler 3 is moved by the keyway of the duplicating key, and the unlocking notch 19 formed at the free outer edge of the locker bar 21 extending along the generatrix of the inner cylinder 2. Cross section V formed along the generatrix of the inner peripheral surface of the outer cylinder 1 when the inner cylinder is rotated, aligned with the inner end edge of
The locking bar 21 that engages with the V-shaped groove is displaced in the radial direction of the inner cylinder by a wedge action to make the inner cylinder rotatable. The present invention is also applicable to this lever tumbler lock.

In this case, the locking bar 21 may be divided between the inner cylinder units or may be integrated as a whole.

In the latter case, since the locking bar 21 engages with all the inner cylinder units, the inner end of the locking bar 21 is pressed by another inner cylinder unit and does not move at the time of picking. It gets harder and harder.

Needless to say, the present invention can be applied to so-called pin cylinder locks.

Incidentally, in FIGS. 1 to 3, FIGS.
The parts having the same sign as and indicate the parts which are equal to each other.

[0035]

As is apparent from the above description, according to the present invention, the inner cylinder of the cylinder lock is divided into a plurality of inner cylinder units including the outer end inner cylinder unit and the second inner cylinder unit adjacent thereto. However, since the one-way clutch that connects the outer end inner cylinder unit to the outer cylinder when it is rotated in the unlocking direction is incorporated, the outer end inner cylinder unit required for picking when the outer end inner cylinder unit is picked The rotation of the unit can be prevented by the connection of the outer end inner cylinder unit and the outer cylinder by the operation of the one-way clutch, and the unauthorized unlocking by picking can be completely prevented.

On the other hand, since the trochanter that constitutes the one-way clutch is engaged with the recess formed in the outer end of the second inner cylinder unit, the outer end inner cylinder unit can be operated during the normal locking / unlocking operation by the key combination. Also, the second inner cylinder unit is integrally rotated through the duplication key and the one-way clutch is not activated, and therefore, no hindrance is caused to the normal locking / unlocking operation.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional side view of a cylinder lock according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view taken along line II-II of FIG.

FIG. 3 is a schematic cross-sectional view taken along line III-III in FIG.

FIG. 4 is a cross-sectional front view showing an example of a conventional lever tumbler lock.

FIG. 5 is a schematic vertical sectional side view showing an example of a conventional disc tumbler lock.

FIG. 6 is a diagrammatic cross-sectional view thereof.

[Explanation of symbols]

 1 Outer Cylinder 2 Inner Cylinder 3 Tumbler 4 Key Hole 5 Key Guide 6 Stopper Plate 7 Retaining Ring 8 Locking Groove 9 Tail Piece 10 Shoulder 11 Outer End Inner Cylinder Unit 12 Second Inner Cylinder Unit 13 Dividing Surface 14 Notch 15 Rotor 16 recess

Claims (1)

[Claims] 1. An inner cylinder of a cylinder lock includes an outer end inner cylinder unit having at least one tumbler and a second inner cylinder unit adjacent to the outer end inner cylinder unit and having at least one tumbler. Divide into a plurality of inner cylinder units, and form a substantially triangular notch on the outer peripheral portion of the inner end surface of the outer end inner cylinder unit, with the wide portion leading when the inner cylinder is rotated in the unlocking direction, and roll into this notch. A pair that houses one end of the child to form a one-way clutch, and clamps the other end of the trochanter in the circumferential direction at an angular position that is substantially aligned with the cutout portion on the outer peripheral surface of the outer end surface of the second inner cylinder unit. A cylinder lock characterized in that a recessed portion having an edge of is formed.