JPH0714041U - Cylinder lock - Google Patents

Abstract

(57) [Summary] [Purpose] An object is to provide a disk tumbler type cylinder lock having a simple structure capable of preventing unauthorized unlocking and unauthorized unlocking by a key combination key. [Structure] A concave bar insertion groove 22 is provided on the inner peripheral surface of the case 1, an accommodation chamber 15 into which a disc tumbler 23 is inserted is provided in the rotor 5 fitted into the case 1, and a bar insertion provided in the accommodation chamber 15 is provided. The side bar 20 that engages with and disengages from the bar insertion groove 22 is inserted into the hole 18, the protrusion engagement portion 19 is provided in the housing chamber 15, and the key insertion hole 2 is provided substantially at the center of the disc tumbler 23.
4, the disc tumbler 23 is provided on one side with an engagement groove 25 into which the side bar 20 is inserted by key insertion, and on the other side, the protrusion engagement portion 19 is engaged to serve as a rotation fulcrum of the disc tumbler 23. The projection 26 is formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disk tumbler type cylinder lock, and more particularly to a disk tumbler type cylinder lock that prevents unauthorized unlocking.

[0002]

[Prior art]

 Cylinder locks have the advantage that they can be mass-produced because the main parts are manufactured by die-casting, and that they can be offered to the market at low cost, and that they can be easily mounted and unlocked, so they can be used for office equipment and rockers. It is used in a wide range of fields.

In a disc tumbler type cylinder lock, an accommodation chamber communicating with a key hole is formed inside a rotor that is rotatably inserted into a cylindrical case, and a plurality of key insertion holes are provided at approximately the center. The disc tumbler is movably inserted into the accommodation chamber, and is urged by a spring in a direction projecting 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 into the key insertion hole by the key and is retracted into the outer peripheral surface of the rotor, so that the key can be rotated in the unlocking direction.

[0004]

[Problems to be solved by the device]

 With the conventional disk tumbler type cylinder lock, the key insertion hole of the disk tumbler can be seen from the outside through the key hole, so the key code can be read from the position of this key insertion hole, and the disk tumbler can be read with a picking tool. There was a problem that it could be unlocked by immersing on the outer peripheral surface (shear line) of the rotor. In order to prevent such illegal unlocking, it has been devised to make it difficult to insert a picking tool into the key groove and to make it difficult to read the key code of the disc tumbler. It could not be completely prevented. The present invention is intended to solve such problems, and provides a disk tumbler type cylinder lock that can prevent unauthorized unlocking and has a simple structure.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the cylinder lock of the present invention comprises a case having a cylindrical shape and a concave bar insertion groove provided on the inner peripheral surface thereof, and a case having a key hole on the front surface rotatably fitted therein. And a rotor having a bar insertion hole penetrating from the outer peripheral surface to the storage chamber and a protrusion engaging portion provided on the wall surface of the storage chamber opposite to the bar insertion hole. The side bar is inserted into the bar insertion hole and the tip of the spring is biased in the direction to engage with the bar insertion groove by a spring, and the side bar is inserted into the storage chamber, and the key insertion hole is provided at approximately the center. An engaging groove for engaging and disengaging the rear end portion of the side bar is provided on one side of the surface, and a protrusion for engaging with the protrusion engaging portion is provided on the other side, and the protrusion is rotatable about the fulcrum. A plurality of disc tumblers and the disc tumblers with engaging grooves for inserting bars It was constructed by and vinegar pulling to turn biasing in the direction away from.

[0006]

[Action]

 In the cylinder lock configured as described above, when locked, the disc tumbler rotates in the biasing direction of the spring with the protrusion as a fulcrum, and the engagement groove of each disc tumbler is disengaged from the bar insertion hole. . Therefore, since the rear end of the side bar cannot be engaged with the engaging groove, the front end is engaged with the bar inserting groove of the case, and the rotor cannot rotate.

In such a locked state, the engagement groove of the disc tumbler and the bar insertion hole of the rotor cannot be visually inspected from the outside through the key hole, so that the engagement groove and the bar insertion hole cannot be aligned. The correct lock is not possible. When a regular key is inserted into the key hole, the key pushes the key insertion hole of each disc tumbler, the disc tumbler rotates with the protrusion 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 the key is applied with a turning force 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 is rotated to the unlocked position.

[0008]

【Example】

 An embodiment of the present invention will be described with reference to 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 a cylinder lock, and FIG. 6 is an exploded perspective view of a cylinder lock. It is a figure. As shown in FIG. 6, at the front end portion (left end portion in FIG. 6) of the cylindrical case 1, a flange portion 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 on the center of the outer peripheral surface.

The rotor 5 rotatably fitted in the case 1 has a flange 6 at the front end thereof, a square shaft 7 extending at the rear, and a male screw 8 screwed at the corner of the square shaft. (See FIG. 1). A cap 10 having a key hole 9 is fitted on the outer peripheral surface of the collar portion 6, both ends of a pin 12 are fixed to an opening 11 at the front end portion of the rotor 5, and a shutter 13 pivotally attached to the pin 12 is provided. A spring 14 wound around the pin 12 urges the keyhole 9 in a direction to close the keyhole 9 (see FIG. 6).

The storage chamber 15 formed inside the rotor 5 communicates with the front opening 11 and is divided into four compartments by a partition wall 16 provided in the storage 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 long narrow hole 18b penetrating the housing chamber 15 through the long groove 18a (see FIG. 2). On the inner wall surface of the accommodating chamber 15, there is formed a projection engaging portion 19 with which the projection 26 of the disc tumbler 23, which will be described later, engages, by a hole formed on the opposite side of the bar insertion hole 18.

The side bar 20 inserted into the bar insertion hole 18 has a tip portion 20a which is inserted into the long groove 18a and a rear end portion 20b which is thinner than the tip portion 20a and is inserted into the elongated hole 18b. The front end surface of the front end portion 20a is formed in a mountain shape (see FIG. 2). A sidebar spring 21 is inserted between the bottom surface of the long groove 18a and the tip portion 20a, and the sidebar 20 is biased in a direction projecting from the outer peripheral surface of the rotor 5 and provided on the inner peripheral surface of the case 1. It is biased in a direction to engage with the concave bar insertion groove 22 (see FIG. 2).

The bar insertion groove 22 has an inclined surface that becomes shallower from the center toward both ends, and when a turning force is applied to the rotor 5 with the tip end portion 19 a of the side bar 19 inserted in the bar insertion groove 21, The tip portion 19a pushed by the inclined surface of the bar insertion groove 21 is pushed in the direction of being recessed in the rotor 5.

The disk tumbler 23 to be inserted into each compartment of the storage chamber 15 has a key insertion hole 24 at substantially the center thereof, and the rear end of the side bar 20 is provided at one side of the outer peripheral surface (right side in FIG. 2). An engagement groove 25 for engaging and disengaging the portion 20b is provided, and a protrusion 26 is formed on the other side. The protrusion 26 is engaged with the protrusion engaging portion 19 of the accommodation chamber 15, but can be in sliding contact with the protrusion engaging portion 19.

A spring 27 is inserted between the right upper surface of the disc tumbler 23 and the upper wall surface of the accommodation chamber 15, and the disc tumbler 23 is biased clockwise with the protrusion 26 as a fulcrum (see FIG. 2). When the insertion hole 24 is pushed by the key, the disc tumbler 23 rotates counterclockwise, 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 is like this.

Since the key insertion hole 24 is located substantially in the center of the protrusion 26 and the engagement groove 25, when the disc tumbler 23 rotates about the protrusion 26 as a fulcrum, the movement amount of the engagement groove 25 is the key insertion hole. This is about twice the movement amount of the hole 24. Therefore, there is an advantage that the groove width of the engaging groove 25 and the wall 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 into the angular shaft portion 7 of the rotor 5, and then a washer 30 is inserted, and then a small nut is attached to the male screw 8 of the angular shaft portion 7. 31 is screwed in, and the case ring 32 is attached to the collar portion 2 of the case 1 (see FIGS. 1 and 6). The cylinder lock assembled as described above is fastened to the door or the like by inserting it into a hole of the door or the like and then tightening the large nut 33 that is 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. 2 to 5. In the locked state, each disc tumbler 23 pressed by the spring 27 uses the projection 26 as a fulcrum to support the operation of FIG. , And the engaging groove 25 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 be engaged with the engagement groove 25, so that the tip portion 20a is engaged with the bar insertion groove 22 of the case 1 to rotate the rotor 5. Is being blocked.

In this locked state, even if the inside is observed from the outside through the keyhole 9 and the key insertion hole 24 of each disc tumbler 23 can be seen, the engagement groove 25 of the disc tumbler 23 and the rotor 5 Since it is not possible to visually check the bar insertion hole 18 of the above, the engagement groove 25 and the bar insertion hole 18 cannot be aligned with each other. Unless the engaging grooves 25 of all the disk tumblers 23 coincide with the bar inserting holes 18 at the same time, the tip end portions 20a of the side bars 20 cannot be pulled out from the bar inserting grooves 22 of the case 1, and the rotor 5 is rotated. Unauthorized unlocking is not possible because the movement is blocked.

When a regular key is inserted into the keyhole 9, the key pushes the inner surface of the key insertion hole 24 of each disc tumbler 23, and each disc tumbler 23 rotates counterclockwise about the protrusion 26 as a fulcrum. The engaging groove 25 coincides with the bar insertion hole 18 (see FIG. 3). Next, when a turning force in the unlocking direction is applied to the key, the tip portion 20a of the side bar 20 that tries 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. Since it is inserted into the rotor 25, the rotor 5 can be rotated (see FIG. 4), and the key can be unlocked.

When the key-difference key is inserted into the key hole 9, the amount by which the key pushes the key insertion hole 24 of the disc tumbler 23 is different, and this difference amount is doubled in the engagement groove 25. The distance between the sidebar 20 and the sidebar 20 becomes large, and there is no possibility that the sidebar 20 will be engaged with the engaging groove 25 (see FIG. 5).

[0021]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects. (1) The structure of the rotation fulcrum of the disk tumbler is simple and easy to process. Further, since the frictional resistance of the pivot point is small, the disc tumbler rotates smoothly, and the operability of locking and unlocking the key is good. (2) The engaging groove and side bar cannot be seen through the keyhole. In addition, unless all the disc tumbler engagement grooves are aligned with the sidebars at the same time, unlocking is not possible, so unauthorized unlocking is not possible. (3) When the disc tumbler is rotated by the key, the amount of movement of the engaging groove is enlarged to about twice the amount of movement of the key insertion hole, which has the advantage of increasing the strength and durability of the side bar. , There is an advantage that there is no danger of being unlocked by keys with different codes.

[Brief description of drawings]

FIG. 1 is a vertical 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 in FIG. 1 showing a state in which a regular key is inserted in a cylinder lock.

FIG. 4 is a sectional view taken along line XX of FIG. 1 showing a rotor rotation start state of the cylinder lock.

5 is a cross-sectional view taken along line XX of FIG. 1 showing a state where a key-difference key is inserted in a cylinder lock.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 5 Rotor 9 Key hole 15 Storage chamber 18 Bar insertion hole 19 Projection engagement part 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)

[Scope of utility model registration request] 1. A case, which is formed in a tubular shape and has a concave bar insertion groove on its inner peripheral surface, a housing chamber which is rotatably fitted in the case and communicates with a keyhole on the front surface, and the outer peripheral surface. A rotor having a bar insertion hole penetrating the accommodation chamber, and a protrusion engaging portion provided on the wall surface of the accommodation chamber on the opposite side of the bar insertion hole, and a tip portion inserted into the bar insertion hole by a spring. Is urged in a direction to engage with the bar insertion groove, and is inserted into the accommodation chamber, a key insertion hole is provided at substantially the center, and the 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 protrusion for engaging with the protrusion engaging portion is provided on the other side, and a plurality of disc tumblers rotatable about the protrusion are engaged with the disc tumbler. A spring that urges the groove to rotate away from the bar insertion hole. A cylinder lock composed of and.