JPH10131561A - Breaking preventive type cylinder lock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem, in which a cylinder luck is broken and lose its the time when an impact is applied by a hammer, etc. SOLUTION: A sliding surface 13 is formed to the outer circumferential surface of the front section of a case 1 for the cylinder lock A, a slipping-off stop ring 15 is fitted into a ring-shaped groove 14 provided around the sliding surface 13, and a key inserting hole 19 superposed to the keyhole 8 of the cylinder lock and an engaging groove 20, into which the slipping-off stop ring 15 is fitted movably with a clearance, are formed to a protective cap 16 having a cylinder upper section 18 rotatably fitted onto the sliding surface 13 and covering the front of the cylinder lock A. A cushioning material 21 having elasticity is inserted between the protective cap capable of being moved by a clearance in the axial direction of the cylinder lock A and the case 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a destruction prevention type cylinder lock for preventing a malicious crime of illegally unlocking by violently destroying the front surface of a cylinder lock using a chisel or a hammer.

[0002]

2. Description of the Related Art Cylinder locks are small and are easy to incorporate into doors, etc., and cannot be unlocked unless a key having a proper code out of a number of codes is used. Widely used.

In a cylinder lock, when a key is not inserted, a driver pin in a case engages with the plug to prevent rotation of the plug, but when a regular key is inserted, a tumbler pin in the plug is inserted. The driver pin is pushed back by the key, and the contact surface between the tumbler pin and the driver pin coincides with the shear line, which is the outer peripheral surface of the plug, so that the plug can be turned, and the key is used to turn the plug to the unlocking angle. Then, it is unlocked and the door can be opened. For example, when a cylinder lock is installed on the door of a vending machine, there is a possibility that the cylinder lock may be broken by a drill or the like at night when traffic is interrupted.
No. 48845, Japanese Utility Model Publication No. 60-28750).

[0004]

However, although the protection member of the cylinder lock has a hardness that prevents cutting, it is easily broken by an impact, so that a crime of hitting and breaking using a chisel or a hammer occurs. was there. In addition, the plug that has been severely impacted retreats inside the case while undergoing plastic deformation, and the driver pin engaged with the plug is sheared and loses the locking function of the cylinder lock, so the cylinder lock is unlocked incorrectly. .
An object of the present invention is to provide a destruction-prevention type cylinder lock in which a locking function is hardly destroyed even when it is severely hit.

[0005]

In order to achieve the above object, the present invention relates to a method for inserting a plug having a key hole in the front into a cylindrical case and inserting the key into the key hole. In the cylinder lock in which the plug can be rotated,
A cylinder lock having a sliding surface formed in the case, a retaining ring fitted in an annular groove provided around the sliding surface, and a cylindrical portion rotatably fitted in the sliding surface. By providing a key insertion hole communicating with the key hole in the protective cap covering the front surface of the above, and providing an engaging groove around which the retaining ring is loosely fitted on the inner surface of the cylindrical portion, the protective cap is provided. The cylinder lock was provided movably in the axial direction by a predetermined distance, and an elastic cushioning material was inserted between the protective cap and the front surface of the case.

It is preferable that a hole with a bottom is provided on the back surface of the protective cap, and an engaging projection is provided on the cushioning material to be engaged with the hole with the bottom. Alternatively, an accommodation recess is provided near the key hole on the front surface of the plug, and an elastic cushioning material is inserted into the accommodation recess, and the key hole and the key insertion hole coincide with the back surface of the protective cap. At times, a recess may be provided at a position facing the accommodation recess, and a steel ball having a high surface hardness may be inserted between the recess and the cushioning material.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a break prevention type cylinder lock A showing a first embodiment of the present invention, and FIG. 3 (A) and (B) are exploded perspective views of a partially cut-away breakage prevention type cylinder lock A, and FIGS. 4 (A) and (B) are partially cut away view of a breakage prevention type cylinder lock A. It is a perspective view. The structure of a general cylinder lock will be briefly described with reference to FIG. 1. A driver pin hole 2 penetrating from an inner peripheral surface to an outer surface of a cylindrical case 1 inserted and fixed to a door or the like is provided in the case 1 in an axial direction. Are arranged in a row.

[0010] Rows of driver pin holes 2 are provided in the upper and lower portions of the case 1, respectively, arranged in the longitudinal direction of the case 1. Although not shown in FIG. 1, the third driver pin holes 2 extend in a direction perpendicular to the plane of the drawing. Two rows are provided in an array. The outer surface of the case 1 is provided with a dovetail-shaped groove 3 overlapping the row of the driver pin holes 2.
The cover 6 is fixed, and a spring 6 is inserted between the cover 4 and the driver pin 5 inserted into each driver pin hole 2. Accordingly, the driver pin 6 is urged in a direction protruding from the inner peripheral surface of the case 1 (see FIG. 1).

A plug 7 inserted into the inner peripheral surface of the case 1 has a key hole 8 opening on the front surface, and a key hole 8 penetrating from the key hole 8 to the outer peripheral surface of the plug 7 to be inserted into each driver pin hole 2 at the key extracting position. The communicating tumbler pin holes 9 are provided, and the tumbler pins 10 are inserted into the respective tumbler pin holes 9. When the key is not inserted, the end of the driver pin 5 pressed by the spring 6 engages with the tumbler pin hole 9 and the plug 7
The end of the tumbler pin 10 pushed by the driver pin 5 protrudes into the keyhole 8. When a key corresponding to the code of the cylinder lock is inserted into the keyhole 8, The pressed tumbler pin 10 is the driver pin 5
And the contact surface between the tumbler pin 10 and the driver pin 5 coincides with the outer peripheral surface (shear line) of the plug, so that the plug 7 can rotate.

The tongue 12 fixed to the shaft 11 at the rear end of the plug 7 is attached to the main body at the locking angle of the plug 7 (when the cylinder lock A is provided on the vending machine door, the box body of the vending machine is used). ), And the door cannot be opened, but the lock is released at the unlocking angle of the plug 7, and the door can be opened. The same locking and unlocking mechanism for a general cylinder lock as described above is also provided for the cylinder lock A.

In the cylinder lock A of the present invention, the sliding surface 13 is provided on the outer surface of the tip of the case 1, and the annular groove 1 is formed on the sliding surface 13.
4 and the retaining ring 15 is fitted in the annular groove 14. The protective cap 16 is made of a material which is hardly broken by impact, and has a covering wall 17 of a size covering the front surface of the cylinder lock A.
And a cylindrical portion 18 protruding from the peripheral edge of the back surface of the covering wall 17 and rotatably fitted to the sliding surface 13 (see FIGS. 1 and 3A).

The cover wall 17 is provided with a key insertion hole 19 which coincides with the key hole 8 at a predetermined angle (see FIGS. 1 and 2), and a retaining ring 15 is provided on the inner peripheral surface of the cylindrical portion 18. An engagement groove 20 for loose fitting is provided around the circumference. Since the width dimension of the engagement groove 20 (the axial width dimension of the cylinder lock A) is larger than the width of the retaining ring 15 by the dimension B, the protection cap 16 can be moved in the axial direction by the dimension B (FIG. 1). reference).

A ring-shaped cushioning material 21 having elasticity is inserted between the back surface of the protective cap 16 and the front surface of the case 1 (see FIGS. 3A and 3B). The protective cap 16 is urged forward (to the right in FIG. 1), and is at a position where it has moved forward until the rear inner wall surface of the engagement groove 20 hits the retaining ring 15. When the protection cap 16 is at the forward position, a gap C is formed between the back surface of the protection cap 16 and the front surface of the plug 7 (see FIG. 4A).

Next, the operation of the destruction prevention type cylinder lock A of the first embodiment configured as described above will be described. The protective cap 16 is pushed by the elastic force of the cushioning material 21 and protrudes from the front surface of the cylinder lock A. A gap D is formed between the rear surface of the cylindrical portion 18 of the protective cap 16 and the case 1. A gap C is formed between the back surface of the covering wall 17 and the front end surface of the plug 7 (see FIG. 4A).

When an impact is applied to the protective cap 16 using a tool such as a chisel or a hammer in order to impact-break the locked cylinder lock A, the cushioning material 21 is elastically compressed to absorb the impact. Therefore, the protective cap 16 is not broken by impact. The cushioning member 21 can be elastically compressed until the rear surface of the cylindrical portion 18 hits the case 1 (until the dimension D becomes zero) (see FIG. 4B). At this time, the retaining ring 15 is engaged. Since the inner wall of the groove 20 has not yet been hit, the retaining ring 15
Is protected from impact. Therefore, the cylinder lock A is not damaged even when subjected to impact destruction.

The breakdown preventing type cylinder lock A ₁ of the second embodiment of the present invention, by providing the bottom with a hole 23 on the back surface of the protective cap 22 is different from the protective cap 16 of the first embodiment,
The cushioning member 24 is formed in a disc shape, the engagement projection 25 provided on the surface is engaged with the hole 23 with the bottom, and the key insertion hole 26 overlapping the key insertion hole 19 of the protective cap 22 is provided. Although different from the cushioning material 21 of the first embodiment, other configurations are the same as those of the first embodiment (see FIGS. 5A to 6).

The destruction-preventive cylinder lock A ₁ constructed as described above is provided with the cylindrical portion 18 of the protective cap 22 and the case 1.
A gap D is formed between the cushioning member 24 and the cushioning member 24. The cushioning member 24 is elastically compressible until the gap D becomes zero, and the shock is absorbed by the elastic compression of the cushioning member 24 as in the first embodiment. Further, since the engagement projection 25 of the protection cap 22 is engaged with the hole 23 with the bottom, the key insertion hole 19 of the protection cap 22 and the key insertion hole 26 of the cushioning material 24 always coincide with each other, and the key is inserted. Has the advantage of being easier.

In the destruction prevention type cylinder lock A ₂ of the third embodiment of the present invention, one or a plurality (two in this embodiment) of circular receptacles are provided near the keyhole 8 on the front face of the plug 7. A plug 7 ′ having a recess 27 is used, and the protection cap 22 is provided with a spherical recess 28 at a position facing the housing recess 27 when the key insertion hole 19 overlaps the keyhole 8. ′
, A buffer material 29 is inserted into the accommodation recess 27 in place of the buffer material 21 or 24, and a steel ball 30 having a high surface hardness is inserted between the buffer material 28 and the spherical recess 28 ( (See FIG. 7). Other configurations are the same as those of the first and second embodiments.

Cylinder lock A for preventing destruction of the third embodiment
_{In the case 2} , a gap D is formed by the pressing force of the cushioning material 29.
(See FIG. 8A), the cushioning material 29 can be elastically compressed until the gap D becomes zero (see FIG. 8B), and the shock is absorbed by the elastic compression of the cushioning material 29 as in the first embodiment. Similarly, when the drill is broken by cutting, the steel ball 29 hitting the cutting edge of the drill runs idle and the drilling of the drill stops at the position indicated by the reference numeral 31. Cutting fracture is also prevented (Fig. 8 (C)).
See) is effective.

[0020]

Since the present invention is configured as described above, it has the following effects. (1) In the destruction prevention type cylinder lock of the present invention, when an impact force is applied to the surface of the cylinder lock, the cushioning material elastically compresses and absorbs the impact force. It will not be destroyed. (2) If a bottomed hole is provided on the back surface of the protective cap and the cushioning material is provided with an engagement projection that engages with the bottomed hole, the cushioning material only absorbs the impact force applied to the cylinder lock. Not
Always match the key hole of the protective cap with the key hole of the plug,
This has the effect of facilitating key insertion. (3) When cushioning material and steel balls are provided between the protective cap and the plug, the cushioning material absorbs the impact force applied to the protective cap, and the steel balls have the effect of preventing cutting fracture.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a destruction prevention type cylinder lock A showing a first embodiment of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 (A) is an exploded perspective view showing a state of each part, and FIG. 3 (B) is an exploded perspective view showing a state in which only a cushioning material is overlapped, in which a main part of a break prevention cylinder lock A is partially cut away.

FIG. 4 (A) is a perspective view of a normal state, and FIG. 4 (B) is a perspective view of a destruction-prevention type cylinder lock A partially cut away, showing a state in which an impact is applied.

FIG. 5 is a cylinder lock A for preventing breakage according to a second embodiment of the present invention.
It is an exploded perspective view of a portion cut away and the main part of _1, 5
5A shows a state of each component, and FIG. 5B shows a state in which only the cushioning material is stacked.

6 is a perspective view partially cut away and the main part of the fracture-proof cylinder lock A _1.

FIG. 7 is a destruction prevention type cylinder lock A according to a third embodiment of the present invention.
FIG. 2 is an exploded perspective view in which a main part of No. ₂ is partially cut away.

Figure 8 is a perspective view partially cut away and the main part of the fracture-proof cylinder lock A _2, FIG. 8 (A) a normal state, and FIG. 8 (B)
8 shows a state in which an impact has been received, and FIG. 8C shows a state in which the drill is broken.

[Explanation of symbols]

A, A ₁ , A ₂ Destruction prevention cylinder lock 1 Case 7, 7 'Plug 8 Keyhole 13 Sliding surface 14 Annular groove 15 Retaining ring 16, 22, 22' Protective cap 17 Coating wall 18 Cylindrical part 19, Reference Signs 26 Key insertion hole 20 Engagement groove 21, 24, 29 Buffer material 23 Bottom hole 25 Engagement projection 27 Housing recess 28 Spherical recess 30 Steel ball

Claims (3)

[Claims] 1. A cylinder lock in which a plug having a keyhole opening in a front surface thereof is inserted into a cylindrical case, and the plug is rotatable when a key is inserted into the keyhole. A moving surface is formed, a retaining ring is fitted into an annular groove provided on the sliding surface, and a cylindrical portion rotatably fitted on the sliding surface covers the front surface of the cylinder lock. The protective cap is provided with a key insertion hole communicating with the key hole, and the inner surface of the cylindrical portion is provided with an engaging groove around which the retaining ring is loosely fitted. A destruction-prevention type cylinder lock provided so as to be movable by a predetermined distance in a direction, and an elastic cushioning material is inserted between the protective cap and the front surface of the case. 2. The destruction prevention type according to claim 1, wherein a bottomed hole is provided on the back surface of said protective cap, and said cushioning material is provided with an engagement projection which engages with said bottomed hole. Cylinder lock. 3. An accommodation recess is provided near the key hole on the front surface of the plug, an elastic cushioning material is inserted into the accommodation recess, and the key hole and the key insertion hole are provided on the back surface of the protective cap. 2. A destruction-prevention type cylinder according to claim 1, wherein a recess is provided at a position opposed to said housing recess when said two coincide with each other, and a steel ball having a high surface hardness is inserted between said recess and said cushioning material. Tablets.