JP2001140512A - Cylinder lock protection mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the destruction of a cylinder lock and prevent theft due to idle turning of the cylinder lock even if a screwdriver is pressed into a key hole and is turned by a strong force. SOLUTION: Radial recessed and projecting face meshing clutch members D, E are provided between an inner cylinder 20 with a key hole which is supported in a cylinder 30 so as to turn freely and a driven shaft 82. When the inner cylinder 20 is turned by a normal key 90, the driven shaft 82 turns, and when the inner cylinder 20 is turned by a flat tip screwdriver, the cylinder 30 turns together with it so that the cylinder 30 and the inner cylinder 20 are displaced forward, the radial recessed and projecting face meshing clutch members D, E are disengaged, and the driven shaft 82 cannot operate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention prevents a cylinder lock from being illegally unlocked or broken by inserting a flathead screwdriver or the like into a cylinder lock and rotating the tumbler without being immersed from a shear line. It concerns the protection mechanism.

[0002]

2. Description of the Related Art A motorcycle will be described as an example. The key is inserted into the main switch to turn it on, the brake lever is depressed, and the starter switch is pressed to turn on the ignition circuit.

[0003]

When a screwdriver is inserted in place of a key and turned with a strong force, the tumbler is cut at the shear line, the inner cylinder turns, the ignition circuit can be turned on, and the motorcycle or the like is stolen. It is happening frequently. According to the present invention, when the screw is turned with a strong force using a flathead screwdriver, the clutch between the inner cylinder and the driven body is disconnected, and the driven body is deactivated.

[0004]

A description will be given with reference to the drawings. The cylinder lock protection mechanism according to the first invention is an inner cylinder with a keyhole 2 rotatably supported in a cylinder cylinder 30.
When the radially uneven surface meshing clutch members D and E are interposed between the shaft 0 and the driven shaft 82, and the inner cylinder 20 is turned with a regular key 90, the driven body 82 rotates and the tumbler 25 is immersed from the shear line LL. When the inner cylinder 20 is turned, the cylinder cylinder 30 is rotated together with the inner cylinder 20, and the cylinder cylinder 30 and the inner cylinder 20 are displaced forward, the radially uneven surface meshing clutch members D and E are disconnected, and the driven shaft 82 is disengaged. It becomes inoperative.

The cylinder lock protection mechanism according to the second aspect of the present invention includes a driving body 50 rotatably fitted in a rear large-diameter hole 32 of the cylinder cylinder 30 into which the keyed inner cylinder 20 is inserted, and a rear part of the inner cylinder 20. The outer case 40 having an inward flange portion 42 that fits the protruding piece 22 protruding at the end into the concave hole 51 on the front surface of the driving body 50 and slidably and rotatably supports the front portion of the cylinder cylinder 30. The rear outward flange 36 of the cylinder cylinder 30 is slidably and rotatably fitted into the cylinder hole 41, and the coil spring 37 fitted on the outer periphery of the cylinder cylinder 30 is connected to the inward flange 42 of the outer case 40 and the cylinder cylinder 30. The intermediate body 70 is rotatably fitted and supported at the center of a lid body 60 fixed to the rear end of the cylinder hole 41 of the outer case 40 so as to be rotatable. Rear projection 73 provided on 72
Are fitted into the concave portion 83 of the driven shaft 82, and the rear surface of the driving body 50 and the rear surface of the cylinder cylinder 30 form radially uneven surface meshing clutch members D and E. The front surface of the intermediate body 70 and the lid 60
The radially uneven surface meshing clutch member D
Is formed, and the both meshing clutch members D and E are formed into radially uneven fan-shaped teeth, and the inclined surfaces 6 are inclined with respect to the rotation direction.
And a valley portion 5 sandwiching the same, is formed into a shape in which both are engaged with each other only at a single point, and when the regular key is inserted into the inner cylinder 20 and rotated, the driving member 50 and the intermediate member 70 are used. When the driven shaft 82 rotates and inserts an abnormal key or the like into the inner cylinder 20 and strongly rotates, the inner cylinder 20, the cylinder cylinder 30, and the driving body 50 rotate integrally and face the coil spring 37. The intermediate body 70 moves forward and does not rotate.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The position of the key 90 immediately before insertion is the front Y, and the position of the driven shaft 82 sandwiching the cylinder lock is the rear Z.
It is.

A description will be given with reference to the drawings. Cylinder cylinder 3
On the inner surface of the front small-diameter hole 31 of 0, a generatrix 33 is provided. Inner cylinder 2 in front small diameter section 31 of cylinder cylinder 30
0 is rotatably inserted. A coil spring 24 is disposed in the inner cylinder 20, and a tumbler 25 is slidably inserted into the slide hole 23 in the diameter direction. Reference numeral 28 denotes a retainer for preventing the inner cylinder 20 from being pulled out of the cylinder 30. When the key 90 is inserted into the keyhole 21 of the inner cylinder 20, the disk-type tumbler 25 enters the shear line LL.
When the key 90 is removed, the tumbler 25 protrudes by the coil spring 24, crosses over the shear line LL, and fits in the generatrix 33. Therefore, the key 90
Is inserted into the keyhole 21, the inner cylinder 20 can be rotated in the small diameter hole 31 at the front of the cylinder cylinder. Further, even if the key 90 is to be removed in a state where the slide hole 23 does not coincide with the busbar direction groove 33, the tumbler 25 contacts the peripheral wall of the front small-diameter hole 31 and the key 90 cannot be removed. When the key 90 is pulled out at a position where the slide hole 23 matches the bus bar direction groove 33, the tumbler 25 projects into the bus bar direction groove 33, and the key 9 is inserted through the key hole 21.
0 can be extracted. The above is the same as the principle of the cylinder lock.

The driven body 80 will be described. A driven shaft 82 having a rectangular recess 83 at the front end is disposed at the center of the driven body case 81, and the starter button can be pressed by rotating the driven shaft 82 to a predetermined angular position.

The principle of the radially uneven surface meshing clutch will be described mainly with reference to FIGS. The end disk surface 1 is cut into a fan shape to form a valley portion 5. Both sides of the valley 5 are inclined and cut out to form an inclined surface 6. The twist angle of the inclined surface 6 is F,
The central axis of the disk surface 1 is MM. The uncut portion is the mountain 4.

In FIGS. 2 to 5 and FIGS. 9 to 11, a primary member G and a secondary member H are formed with a radially uneven surface interposed therebetween. The central axes of the primary member G and the secondary member H are the same as the central axis MM of the disk surface 1. The primary member G and the secondary member H are each divided into two by two concentric cylinders. The primary member G is a primary central member Ga,
It is divided into a primary side annular member Gb. The secondary member H is divided into a secondary center member Ha and a secondary annular member Hb.

A rear large-diameter hole 3 is provided at the rear of the cylinder tube 30.
2 are provided. A driving body 50 is provided in the rear large-diameter hole 32.
Are rotatably fitted. A square concave hole 51 is provided on the front surface of the driving body 50, and the rectangular projecting piece 22 at the rear end of the inner cylinder 20 is fitted into the concave hole 51. An outward flange 36 is provided at a rear portion of the cylinder tube 30, and a primary annular member Gb is formed. A primary center member G is provided on the rear surface of the driving body 50.
a is formed.

An outer case 4 provided with an inward flange 42 for slidably and rotatably supporting a front portion of the cylinder tube 30.
The 0 cylindrical hole 41 supports the outward flange portion 36 of the cylinder tube 30 so as to be slidable and rotatable. The coil spring 37 fitted on the outer periphery of the cylinder tube 30 is compressed between the outward flange portion 36 of the cylinder tube 30 and the inward flange portion 42 of the outer case 40.

At the rear end of the cylindrical hole 41 of the outer case 40, a lid 6 is provided.
0 is fixed. An intermediate body 70 that is rotatably fitted to the lid 60 from the front side and has a small-diameter portion 72 that penetrates the lid 60.
Is formed with a secondary-side center member Ha on the front surface thereof. A square projection 73 that fits into a square recess 83 of the driven shaft 82 is provided in the rearward projecting small diameter portion 72 of the intermediate body 70. The primary side center member Ga on the rear surface of the driving body 50 and the primary annular member Gb on the rear surface of the cylinder cylinder 30 form a radially uneven surface meshing clutch member D. Secondary center member Ha on the front surface of intermediate body 70 and secondary annular member H on the front surface of lid 60
b to form a radially concave-convex surface meshing clutch member E having an inverted shape.

[0014] Both meshing clutch members D and E are formed into radially uneven fan-shaped teeth, and have ridges 4 and valleys 5 sandwiching an inclined surface 6 with respect to the rotation direction. It is formed in a shape.

The operation will be described. The normal key 90 is inserted into the keyhole 21 as shown in FIG. The tumbler 25 is completely immersed in the slide hole 23 and does not protrude into the shear line LL.

When the key 90 is turned, the inner cylinder 20, the projecting piece 22, the concave hole 51, the driving body 50 (primary side center member Ga), and the intermediate body 7 are turned.
The driven shaft 82 rotates through the 0, the small-diameter portion 72, the square protrusion 73, and the square recess 83 (the areas filled with innumerable points in FIG. 4 rotate together). At this time, the primary side annular member Ha of the cylinder cylinder 30 is moved by the spring force of the coil spring 37 to the lid 60.
Is pressed and meshed with the secondary side annular member Hb, and the cylinder cylinder 30 does not rotate.

As shown in FIG. 5, a slotted screwdriver 95 is inserted into the keyhole 21. Tumbler 25 is shearline L
-Projecting above L.

When the screwdriver 95 is turned, the inner tube 20, the cylinder tube 30, and the driving body 50 receive a turning force at the same time. The inclined surface 6 of the primary annular member Gb of the cylinder cylinder 30 slides with respect to the inclined surface 6 of the secondary annular member Hb of the lid 60, and FIG.
As shown in FIG. 11, the cylinder cylinder 30 is displaced to the left in FIG. 5 against the coil spring 37, and the primary side annular member Gb with respect to the peak 4 of the secondary side annular member Hb (lid 60).
The peak 4 of the (cylinder cylinder 30) comes into contact and slips (FIG. 11).
A), and the driving body 50 fixedly related to the cylinder cylinder 30 is separated from the intermediate body 70 (only the area filled with innumerable points in FIG. 5 rotates together). That is, the clutch is disengaged (FIG. 11B).

[0019]

According to the conventional cylinder lock, the square projection at the rear end of the inner cylinder is fitted into the square recess of the driven shaft, and the cylinder cylinder is fixed to the outer case. For this reason, if you insert the tip of a flathead screwdriver into the keyhole and turn the inner cylinder strongly, the tumbler is sheared and broken at the shear line, the inner cylinder turns, the driven shaft is turned, the engine starts, and the vehicle is stolen. was there.

In the present invention, when the regular key is inserted into the inner cylinder 20 and rotated, the driven shaft 82 is rotated via the driven body 50 and the intermediate body 70 as shown by the small dots in FIG. When a slotted screwdriver or the like is inserted into the inner cylinder 20 to rotate the inner cylinder 20, the inner cylinder 20, the cylinder cylinder 30, and the driving body 50 rotate together as shown in FIG. , The two meshing clutch members D and E are disengaged, and the intermediate body 70 does not rotate (FIG. 11B).
Unauthorized unlocking can be prevented, and damage to the cylinder lock can be prevented.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of the entire mechanism according to the present invention.

FIG. 2 is an exploded perspective view of FIG.

3A is a longitudinal sectional side view of a mechanism according to the present invention, and FIG. 3B is a QQ sectional view of a cylinder cylinder.

FIGS. 4A and 4B are diagrams corresponding to FIG. 3 in a state where a regular key is used.

FIGS. 5A and 5B are diagrams corresponding to FIG. 3 in a state in which a flathead screwdriver is illegally used.

FIG. 6 is a perspective view of a radially uneven surface.

FIG. 7 is a front view of a radial uneven surface.

FIG. 8 is a side view of a radial uneven surface.

FIG. 9 is a principle perspective view of a main part before attempting an unauthorized unlocking;
(A) is an external view, (B) is a perspective view.

FIG. 10 is a principle perspective view of a state in which an unauthorized unlocking is started and the screwdriver is slightly turned, (A) is an external view, and (B).
Is a perspective view.

FIGS. 11A and 11B are perspective views showing a state in which a screwdriver is turned while an unauthorized unlocking operation is attempted, in which FIG. 11A is an external view and FIG. 11B is a perspective view.

FIG. 12 is an exploded exploded view in principle for explaining a clutch.

FIG. 13 is a diagram showing a state where the clutch is connected in FIG.

FIG. 14 is a diagram showing a state where the clutch is disengaged in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc surface 4 Crest part 5 Valley part 6 Inclined surface 20 Inner cylinder 21 Key hole 22 Protrusion piece 23 Slide hole 24 Coil spring 25 Tumbler 27 Window hole 28 Retainer 30 Cylinder cylinder 31 Front small diameter hole 32 Rear large diameter hole 33 Bus line direction Groove 34 Busline direction groove side wall 35 Busline direction groove bottom wall 36 Outer flange 37 Coil spring 40 Outer case 41 Cylindrical hole 42 Inward flange 50 Driver 51 Concave hole 60 Cover 70 Intermediate body 72 Small diameter part 73 Square protrusion 80 Drive Body 82 Driven shaft 83 Square recess 90 Key 95 Slotted screwdriver D, E Radial uneven surface meshing clutch member F Small angle G Primary side member Ga Primary side center member Gb Primary side annular member H Secondary side member Ha Secondary side center member Hb Secondary side annular member MM Center axis Y Front Z Rear

Claims (2)

[Claims] 1. A radially uneven surface meshing clutch member (D, E) is interposed between a driven shaft (82) and an inner cylinder with a keyhole (20) rotatably supported in a cylinder cylinder (30). ,
When the inner cylinder (20) is turned with the regular key (90), the driven shaft (8
2) turns, and the tumbler (25) turns into the shear line (L-
When the inner cylinder (20) is turned without being immersed in L), the cylinder cylinder (30) is rotated together with the inner cylinder (20), and the cylinder cylinder (30) and the inner cylinder (20) are displaced forward and radially. A cylinder lock protection mechanism characterized in that the concave and convex surface meshing clutch members (D, E) are disengaged and the driven shaft (82) is inoperative. 2. A driving body (50) is rotatably fitted to a rear large-diameter hole (32) of a cylinder cylinder (30) into which a keyhole inner cylinder (20) is inserted, and the rear part of the inner cylinder (20). A protruding piece (22) protruding from the end is fitted into a concave hole (51) on the front surface of the driving body (50), and an inward flange (slidably / rotatably) supports a front portion of the cylinder tube (30). The cylinder cylinder (3) is inserted into the cylinder hole (41) of the outer case (40) having the
0) The rear outward flange (36) is slidably and rotatably fitted and the coil spring (37) fitted on the outer periphery of the cylinder tube (30) is connected to the inward flange 42 of the outer case (40) and the cylinder. The intermediate body (70) is shrunk between the outward flange (36) of the cylinder (30) and the center of the lid (60) fixed to the rear end of the cylinder hole (41) of the outer case (40). It is movably fitted and supported, and the rear protrusion (73) provided on the small-diameter portion (72) of the intermediate body (70) is fitted into the recess (83) of the driven shaft (82). A radially uneven surface meshing clutch member (D) is formed by the rear surface of the cylinder tube (30), and the radially uneven surface meshing clutch member (D) is formed by the front surface of the intermediate body (70) and the front surface of the lid (60). Forming a mating clutch member (E) having a concavo-convex radial concavo-convex surface, The engagement clutch member (D, E) is formed into a radially uneven fan-shaped tooth, and has a ridge (4) and a valley (5) sandwiching the inclined surface (6) with respect to the rotation direction. Only when both are formed in a shape that meshes with each other, and when the regular key is inserted into the inner cylinder (20) and rotated, the driven shaft (82) is driven via the driving body (50) and the intermediate body (70).
When an abnormal key or the like is inserted into the inner cylinder (20) and the inner cylinder (20) is strongly rotated, the inner cylinder (20), the cylinder cylinder (30) and the driving body (50) are integrally rotated and the coil spring is rotated. (3
A cylinder lock protection mechanism, wherein the intermediate body (70) moves forward against 7) and does not rotate.