JP2596862Y2 - Cylinder lock - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk tumbler type cylinder lock, and more particularly, to a disk tumbler type cylinder lock for preventing unauthorized unlocking.

[0002]

2. Description of the Related Art Cylinder locks have the advantage of being offered to the market at low cost because the main parts are manufactured by die-casting and being mass-produced, and the advantage of being easy to install and lock and unlock. It is used in a wide range of fields, including rockers.

In a disk tumbler type cylinder lock, a plurality of disks each having a storage chamber communicating with a key hole formed inside a rotor rotatably inserted into a cylindrical case, and having a key insertion hole substantially at the center. The tumbler is movably inserted into the storage chamber, and is urged by a spring in a direction protruding from the outer peripheral surface of the rotor and engaging with the case. When the key is inserted into the key hole, the disk tumbler is pushed by the key into the key insertion hole, immerses in the outer peripheral surface of the rotor, and can rotate the key in the unlocking direction.

[0004]

In the conventional disk tumbler type cylinder lock, the key insertion hole of the disk tumbler can be visually checked through the key hole from the outside. Therefore, the key code can be read from the position of the key insertion hole. Can,
There is a problem that the disk tumbler is immersed in the outer peripheral surface (shear line) of the rotor by the picking tool and is unlocked illegally. In order to prevent such unauthorized unlocking, it has been made difficult to insert the picking tool into the keyway or to read the key code of the disk tumbler. It could not be completely prevented. An object of the present invention is to provide a disk tumbler type cylinder lock which can prevent unauthorized unlocking and has a simple structure.

[0005]

In order to achieve the above object, a cylinder lock according to the present invention has a case formed in a cylindrical shape and provided with a concave bar insertion groove on an inner peripheral surface, and the case is rotatable. And a bar insertion hole which penetrates the housing chamber from the outer peripheral surface to the housing chamber communicating with the key hole on the front surface, and a projection engaging portion is provided on a wall surface of the housing chamber opposite to the bar insertion hole. Is provided, a side bar which is inserted into the bar insertion hole and whose distal end is urged by a spring in a direction engaging with the bar insertion groove, is inserted into the accommodation chamber,
A key insertion hole is provided substantially at the center, an engagement groove for engaging and disengaging the rear end of the side bar is provided on one side of the outer peripheral surface, and a projection is provided on the other side for engaging with the projection engagement portion. And a plurality of disc tumblers rotatable about the projections, and a spring for urging the disc tumbler to rotate in a direction in which the engaging groove is separated from the bar insertion hole.

[0006]

In the cylinder lock constructed as described above, at the time of locking, the disk tumbler rotates in the biasing direction of the spring with the projection as a fulcrum, and the engagement groove of each disk tumbler is disengaged from the bar insertion hole. doing. Therefore, since the rear end of the side bar cannot be engaged with the engagement groove, the front end is engaged with the bar insertion groove of the case, and the rotor cannot rotate.

In such a locked state, the engagement groove of the disk tumbler and the hole for inserting the bar of the rotor cannot be visually observed through the key hole from outside, so that it is not possible to align the engagement groove with the hole for inserting the bar. Correct release is not possible. When a regular key is inserted into the key hole, the key pushes the key insertion hole of each disk tumbler, and the disk tumbler rotates with the projection as a fulcrum, and each engagement groove matches the bar insertion hole. The rear end of the bar can be engaged with each engagement groove. When a turning force is applied to the key in the unlocking direction in this state, the tip of the side bar is pushed out from the bar insertion groove of the case, and the rotor rotates to the unlocking position as it is.

[0008]

FIG. 1 is a longitudinal sectional view of a cylinder, FIG. 2 is a sectional view taken along line XX of FIG. 1, showing a locked state of a cylinder lock, and FIG. It is an exploded perspective view of a lock. As shown in FIG. 6, at the front end (left end in FIG. 6) of the cylindrical case 1, a flange 2 is provided on the outer peripheral surface, and a large-diameter inner peripheral surface 3 is formed on the inner peripheral surface. A male screw 4 is screwed at the center of the surface.

A rotor 5 rotatably inserted into the case 1
A flange 6 is provided at the front end, a square shaft 7 is extended at the rear, and a male screw 8 is screwed at a corner of the square shaft (see FIG. 1).
A cap 10 having a keyhole 9 is fitted on the outer peripheral surface of the flange 6, both ends of a pin 12 are fixed to an opening 11 at a front end of the rotor 5, and a shutter 13 pivotally attached to the pin 12 is The keyhole 9 is urged by a spring 14 wound around the keyhole 9 (see FIG. 6).

An accommodation chamber 15 formed inside the rotor 5
Communicates with the front opening 11 and is divided into four sections by a partition 16 provided in the accommodation chamber 15 (see FIG. 1).
The bar insertion hole 18 provided on the outer peripheral surface of the rotor 5 is constituted by a long groove 18a parallel to the longitudinal direction of the rotor 5 and a narrow hole 18b penetrating the accommodation chamber 15 through the long groove 18a (see FIG. 2). A bar insertion hole 1 is provided on the inner wall surface of the accommodation room 15.
The hole formed on the opposite side of the projection 8 forms a projection engaging portion 19 with which a projection 26 of the disc tumbler 23 described later engages.

The side bar 2 inserted into the bar insertion hole 18
0 has a front end portion 20a inserted into the long groove 18a, and a rear end portion 20b formed thinner than the front end portion 20a and inserted into the elongated hole 18b, and the front end surface of the front end portion 20a has a chevron shape. (See FIG. 2). A side bar spring 21 is inserted between the bottom surface of the long groove 18a and the tip portion 20a, and the side bar 20 is urged in a direction protruding from the outer peripheral surface of the rotor 5 to form a concave shape provided on the inner peripheral surface of the case 1. (See FIG. 2).

The bar insertion groove 22 has an inclined surface that becomes shallower from the center toward both ends.
When a rotational force is applied to the rotor 5 in a state in which a is inserted into the bar insertion groove 21, the tip portion 19 a pressed on the inclined surface of the bar insertion groove 21 is pushed in a direction of immersing in the rotor 5.

A disk tumbler 23 inserted into each section of the accommodation chamber 15 has a key insertion hole 24 substantially at the center.
Is provided on one side (the right side in FIG. 2) of the outer peripheral surface, an engagement groove 25 is provided for engaging and disengaging the rear end portion 20b of the side bar 20, and a projection 26 is formed on the other side. The projection 26 engages with the projection engagement portion 19 of the accommodation chamber 15, but the projection engagement portion 1
9 is in sliding contact.

A spring 27 is inserted between the right upper surface of the disk tumbler 23 and the upper wall surface of the storage chamber 15, and the disk tumbler 23 is urged clockwise about the projection 26 as a fulcrum (see FIG. 2) to insert a key. When the hole 24 is pressed by the key, the disc tumbler 23 rotates counterclockwise so that the engagement groove 25 and the bar insertion hole 18 are aligned, and the side bar 20 is engaged with the engagement groove 25. It has become.

The key insertion hole 24 has a projection 26 and an engagement groove 25.
, The amount of movement of the engagement groove 25 is about twice the amount of movement of the key insertion hole 24 when the disk tumbler 23 rotates about the projection 26 as a fulcrum. Therefore, there is an advantage that the groove width of the engagement groove 25 and the thickness of the rear end portion 20a of the side bar 20 can be increased accordingly.

A rotation amount regulating cam 28 having a square hole and a tongue 29 are inserted through the square shaft portion 7 of the rotor 5, and then a small nut 31 is inserted into the male screw 8 of the square shaft portion 7 after a washer 30 is inserted. Is screwed in, and the case ring 32 is attached to the flange 2 of the case 1 (see FIGS. 1 and 6). After the cylinder lock assembled as described above is inserted into a hole of a door or the like, it is fastened to a door or the like by tightening a large nut 33 screwed into the male screw 4 of the case 1.

Next, the operation of the cylinder lock of the present invention will be described with reference to FIGS.
Referring to FIG. 5, in the locked state, each disk tumbler 23 pressed by the spring 27 rotates clockwise in FIG.
5 is located away from the bar insertion hole 18. In such a locked state, the rear end portion 20b of the side bar 20 cannot engage with the engagement groove 25, so that the front end portion 20a engages with the bar insertion groove 22 of the case 1 and the rotor 5 rotates. Has been blocked.

In this locked state, even if the inside can be observed from the outside through the keyhole 9, the key insertion hole 24 of each disk tumbler 23 can be seen,
It is not possible to visually check the engagement groove 25 and the bar insertion hole 18 of the rotor 5, so that the engagement groove 25 and the bar insertion hole 18 cannot be matched. Unless the engagement grooves 25 of all the disk tumblers 23 coincide with the bar insertion holes 18 at the same time, the tip 20a of the side bar 20 cannot come out of the bar insertion groove 22 of the case 1 and the rotor 5 rotates. Because it is blocked, unauthorized unlocking is not possible.

When a regular key is inserted into the keyhole 9, the key pushes the inner surface of the key insertion hole 24 of each disk tumbler 23, and each disk tumbler 23 rotates counterclockwise about the projection 26 as a fulcrum, The engagement groove 25 matches the bar insertion hole 18 (see FIG. 3). Next, when a turning force in the unlocking direction is applied to the key, the front end portion 20a of the side bar 20 that is about to rotate together with the rotor 5 is pushed out from the bar insertion groove 22 of the case 1, and the rear end portion 20b is engaged with the engagement groove. 25, the rotor 5 becomes rotatable (see FIG. 4) and can be unlocked by a key.

When the wrong key is inserted into the key hole 9, the amount by which the key presses the key insertion hole 24 of the disk tumbler 23 is different. In the engagement groove 25, this difference is doubled.
The distance between the engagement groove 25 and the side bar 20 increases,
There is no possibility that the side bar 20 is engaged in the engagement groove 25 (see FIG. 5).

[0021]

[Effects of the Invention] The present invention is configured as described above, and has the following effects. (1) The structure of the pivot point of the disk tumbler is simple,
Processing is easy. Further, since the friction resistance of the pivot point is small, the disk tumbler rotates smoothly, so that the operability of locking and unlocking the key is good. (2) The engaging groove and sidebar cannot be seen through the keyhole. In addition, unless the positions of the engaging grooves of all the disk tumblers coincide with the side bars at the same time, the disk tamper is not unlocked, so that unauthorized unlocking is impossible. (3) When the disk tumbler is rotated by the key, the amount of movement of the engagement groove is approximately twice as large as the amount of movement of the key insertion hole, so that the strength and durability of the sidebar are increased. There is an advantage that there is no danger of unlocking with a key having a different code.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a cylinder.

FIG. 2 is a sectional view taken along line XX of FIG. 1 showing a locked state of the cylinder lock.

FIG. 3 is a sectional view taken along line XX of FIG. 1 showing a state in which a regular key is inserted into a cylinder lock.

FIG. 4 is a sectional view taken along line XX of FIG. 1 showing a state in which the rotation of the cylinder lock is started.

FIG. 5 is a sectional view taken along line XX of FIG. 1 showing a state in which a wrong key is inserted into the cylinder lock.

FIG. 6 is an exploded perspective view of the cylinder lock.

[Explanation of symbols]

 1 Case 5 Rotor 9 Keyhole 15 Storage Chamber 18 Bar Insertion Hole 19 Projection Engagement 20 Sidebar 21 Sidebar Spring 22 Bar Insertion Groove 23 Disc Tumbler 24 Key Insertion Hole 25 Engagement Groove 26 Projection 27 Spring

Claims (1)

(57) [Scope of request for utility model registration] 1. A case formed in a cylindrical shape and provided with a concave bar insertion groove on an inner peripheral surface, a housing chamber rotatably fitted in the case and communicating with a keyhole on a front surface and an outer peripheral surface. A rotor provided with a bar insertion hole penetrating the accommodation chamber, and a projection engaging portion provided on the wall surface of the accommodation chamber opposite to the bar insertion hole; and a tip inserted into the bar insertion hole by a spring. Is inserted in the accommodation chamber, a key insertion hole is provided substantially in the center, and a rear end of the side bar is provided on one side of the outer peripheral surface. An engaging groove for engaging and disengaging is provided, and a projection for engaging the projection engaging portion is provided on the other side, and a plurality of disc tumblers rotatable around the projection as a fulcrum. A spring that urges the groove to rotate away from the bar insertion hole And a cylinder lock.