JPH09151632A - Drill breaking preventing type cylinder lock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To preclude the possibility of drill-breaking a defenseless side of a cylinder lock by drilling from the position away from the cylinder lock obliquely from the door front. SOLUTION: A tool stopping member 48 formed cylindrically by a cemented carbide is installed on the outer peripheral surface of a case 35 for a drill breaking preventing type cylinder lock C. A female screw 49 is provided on the inner peripheral surface of the tool stopping member 48, and the female screw 49 is screw-engaged with a male screw 40 provided on the outer peripheral surface of the case 35. Two positioning legs which can be brought into sliding contact with two flat parts 39 provided on the outer peripheral surface of the case 35 are disposed on the end part of the tool stopping member, and the tip ends of the positioning legs are brought into contact with a flange part 38 of the case 35 to position the installation of the tool stopping member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drill breakage prevention type cylinder lock for preventing a malicious crime in which a cylinder lock attached to a door of a vending machine is broken by a drill.

[0002]

2. Description of the Related Art In order to prevent a malicious crime in which a cylinder lock being locked is broken and illegally unlocked, a drill breakage prevention type cylinder lock containing a steel ball has been known for a long time (for example, England. References such as Japanese Patent No. 6783). The vertical cross-sectional view of FIG. 11 shows an example of a drill breakage prevention type cylinder lock containing a steel ball, and a plurality of driver pin holes 2 extending in the radial direction are provided in the cylindrical case 1 in the axial direction of the case 1. In the driver pin hole 2, a driver pin 3 and a spring 4 for urging the driver pin 3 in a direction projecting from the inner peripheral surface of the case 1 are inserted into the driver pin hole 2, and it is a general cylinder lock. Same as the above, but in front of the driver pin hole 2, a steel ball housing chamber 5 opening to the inner peripheral surface of the case 1 is provided, and in the steel ball housing chamber 5, a steel ball 6 having a high surface hardness is provided. Is inserted.

A plug 7 rotatably inserted into the case 1 has a keyhole 8 opening to the front, and a keyhole 8 penetrating from the keyhole 8 to the outer peripheral surface of the plug 7, and when the plug 7 is at a locking angle, The tumbler pin hole 9 facing the pin 3 is provided, and the tumbler pin 10 is inserted into the tumbler pin hole 9, which is similar to a general cylinder lock. However, the tumbler pin hole 9 is opened to the outer peripheral surface of the plug 7 in front of the tumbler pin hole 9. Steel ball chamber 11
And a steel ball 12 having a high surface hardness is inserted into the steel ball storage chamber 11.

In the locked state where the key is not inserted into the key hole 8, the end of the driver pin 3 pushed by the spring 4 engages with the tumbler pin hole 9 to prevent the plug 7 from rotating.
The end of the tumbler pin 10 pushed by the driver pin 3 projects into the key hole 8. When a regular key is inserted into the keyhole 8, the tumbler pin 10 pushed by the key will move into the driver pin 3.
, The contact surface between the tumbler pin 10 and the driver pin 3 coincides with the outer peripheral surface (shear line) of the plug 7, so that the plug 7 can be rotated. When the key is rotated to the unlocking angle, The engagement between the tongue 13 fixed to the end and the locking member (not shown) on the fixed side is released, and the door can be opened.

When the cylinder lock is locked and the shear line of the cylinder lock and the vicinity thereof are drilled from the front side of the cylinder lock by a drill to try to unlock the cylinder lock, the steel balls 6 and 12 hitting the blade edge of the drill spin idle. Prevent drill cutting. Since the surface hardness of the steel balls 6 and 12 is high enough not to accept the cutting edge of the drill, the steel balls 6 and 12 cannot be cut.

[0006] FIG. 12 shows a key hole that is displaced not only in the vicinity of the shear line of the plug 7 but also in the upper and lower positions with respect to the key hole 8 and in one direction in order to protect the entire plug 7 from drill breakage as much as possible. On the other side of 8, the steel ball storage chambers 11 and 11 ′ that are as large as possible are provided.
Steel balls 12 and 12 'are rotatably inserted into 1', respectively. However, even if the plug 7 is protected by the steel balls 12 and 12 'in this way, it is not possible to completely prevent the drill breakage of the keyhole 8 and its periphery.

The present applicant has proposed a drill breakage prevention type cylinder lock as shown in FIG. 13 in order to prevent the drill breakage of the key hole 8 and its periphery (Japanese Patent Application No. 6-221502).
No.). This cylinder lock has a through hole 15 penetrating a region including the key hole 8 of the plug 7, and a tool blocking member 16 made of cemented carbide is inserted into the through hole 15. Cemented carbide has a hardness higher than that of the cutting edge of the drill, so that drilling of the drill can be prevented. The present applicant has further proposed a cylinder lock of a type in which a tool-blocking member made of cemented carbide and a steel ball are combined to protect every part of the front surface of the cylinder lock from drill breakage (Japanese Patent Application No. 7-217612). No.).

When the above-described drill breakage prevention type cylinder lock is attached to the door of a vending machine, even if the front of the cylinder lock is broken with a drill in order to steal the goods in the vending machine, Since the alloy tool blocking member or the steel ball blocks the cutting edge of the drill, the cylinder lock cannot be broken and the door cannot be opened.

[0009]

However, there is a possibility that the unprotected side surface of the cylinder lock may be broken by drilling from a position avoiding the cylinder lock diagonally from the front of the door. An object of the present invention is to solve such a problem.

[0010]

In order to achieve the above object, the present invention provides a drill lock prevention type cylinder lock in which a tool blocking member made of steel ball or cemented carbide is built in the front portion of the cylinder lock. A tool blocking member formed of a hard alloy in a cylindrical shape is mounted on the outer peripheral surface of the cylinder case.

As a specific mounting method of this tool blocking member, a female screw that is screwed onto a male screw threaded on the outer peripheral surface of the cylinder case is provided on the inner peripheral surface of the tool blocking member,
The tool blocking member may be screwed on the outer peripheral surface of the cylinder case. Alternatively, it is preferable that the end surface of the tool blocking member is provided with a positioning leg portion that is guided by a flat surface portion formed on the outer peripheral surface of the cylinder case and comes into contact with a flange portion formed at the tip end portion of the cylinder case.

Alternatively, according to the present invention, in a drill break prevention type cylinder lock in which a tool blocking member made of steel ball or cemented carbide is built in the front part of the cylinder lock, the tool blocking member formed in a plate shape by cemented carbide. A through hole can be provided in the cylinder lock, and the through hole can be fitted to the shaft portion of the rear portion of the rotor of the cylinder lock.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view for explaining a state in which a drill breakage prevention type cylinder lock C is attached to a door locking device A. The door locking device A of the embodiment has a handle protruding type and is fixed to a door D of a vending machine or the like. The handle pop-out type door locking device A has a handle housing recess 21 formed on the front surface of the lock case 20 inserted into the hole of the door D, and an inner peripheral surface 22 penetrating the bottom surface of the handle housing recess 21. The sleeve 23 is rotatably inserted (see FIGS. 1 and 3B).

The sleeve 23 has a rear wall 25 provided at the rear end of the tubular portion 24 (see FIG. 1), and the handle 26 has a shaft portion 27 which is axially inserted into the tubular portion 24 and a shaft 27. Part 27
The handle 28 is provided at the tip of the lock case 20 and is urged by a spring 29 inserted between the rear wall 25 and the rear end surface of the shaft 27 in a direction projecting from the front surface of the lock case 20 (see FIG. 1). ，
See FIG. 3B)).

Inside the shaft portion 27, a lock plate accommodating chamber 30 opening to the outer peripheral surface of the rear portion, a large diameter hole 31 opening to the front surface of the shaft portion 27, and a large diameter hole 31 from the large diameter hole 31 to the lock plate accommodating chamber 30. A small-diameter hole 32 that communicates is provided, and a spring 34 is inserted between the lock plate 33 housed in the lock plate housing chamber 30 and the bottom surface of the lock plate housing chamber 30. It is biased in the protruding direction (see FIG. 1).

The drill breakage prevention type cylinder lock C, like a general cylinder lock, has a rotor 36 inserted in a cylindrical case 35, and a key hole 3 provided on the front surface of the rotor 36.
When the key is inserted into 7, the rotor 36 becomes rotatable.
The shape of the outer surface of the case 35 is similar to that of a general cylinder lock. A flange 38 is provided around the front end of the case 35, and a flat surface that extends from the flange 38 to the rear end of the case 35 is provided on the outer peripheral surface of the case 35 at opposite positions. The portion 39 is provided, and the male screw 40 is provided on the outer peripheral surface (see FIGS. 1 and 5).

The flat portion 39 is for forming the outer peripheral surface of the case 35 into a non-circular shape. Since a general cylinder lock is inserted into a hole of the same shape provided in the door locking device, the case 35 is It cannot rotate with respect to the locking device. The male screw 40 is
The case 35 is fastened to the door locking device. Generally,
A nut (not shown) with which the male screw 40 is screwed and the collar portion 38
The door locking device is clamped by.

As shown in FIG. 4, the cylinder lock mounting structure in the handle protruding type door locking device A has a rectangular bottomed hole on the outer peripheral surface of the shaft portion 27 of the handle 26 and a bottom surface of the bottomed hole. A stopper mounting hole 41 constituted by a rectangular through hole reaching the large diameter hole 31 from both ends is provided, and a screw hole 42 is provided at the center of the bottom surface of the bottomed hole. The stopper 43 inserted into the stopper mounting hole 41 is formed in a substantially U-shape, and has a screw insertion hole 44 penetrating the central portion and the arm 4 protruding at right angles from both end portions.
5 is provided, and a serrated protrusion 46 that meshes with the male screw 40 of the cylinder lock C is provided at the tip of the arm 45.

After inserting the cylinder lock C into the large diameter hole 31, the stopper 43 is inserted into the stopper mounting hole 41, and the tip of the screw 47 inserted into the screw inserting hole 44 is screwed into the screw hole 42. The tip of the arm 45 projects into the large diameter hole 31 via the stopper mounting hole 41, the serrated projection 46 meshes with the male screw 40, and the cylinder lock C is tightened. The cylinder lock mounting structure of the handle locking type door lock device as described above is the same for both the general cylinder lock and the drill breakage prevention type cylinder lock C.

The first embodiment of the present invention is the above-mentioned male screw 40.
The internal thread 49 of the tool blocking member 48 made of a cemented carbide formed in a cylindrical shape is fitted to the internal thread 49 of the male thread 40.
Are screwed together (see FIG. 5). An annular protrusion 50 for limiting the screwing position of the tool blocking member 48 is provided at an end portion (right end portion in FIG. 5) of the tool blocking member 48, and as shown in FIG. 1, the male screw 40 is provided at a position where the stopper 43 meshes. Should be exposed.

In the second embodiment of the present invention, as shown in FIGS. 6 and 7, the cross-sectional shape of the cylindrical tool blocking member 48 'is formed into a non-circular shape similar to the outer peripheral surface of the case 35, Stopping material 4
Two positioning legs 51 are provided on the end face of 8 '.
When the tool blocking member 48 'is inserted around the outer peripheral surface of the case 35,
Since the positioning leg portion 51 makes sliding contact along the flat surface portion 39 of the case 35 and the tip end abuts on the flange portion 38 of the case 35, a position where the stopper 43 is engaged with the male screw 40 is secured.

FIGS. 8 to 10 show a third embodiment of the present invention, which is a non-circular shape provided at the rear end of the rotor 36 at approximately the center of a tool blocking member 52 formed of a plate of cemented carbide. A non-circular through hole 54 into which the shaft portion 53 is inserted is provided. Then, the angle regulation cam 55 and the tool blocking member 52 are mounted on the non-circular shaft portion 53. The third embodiment can be used in combination with the first embodiment or the second embodiment.

The outline of the internal structure of the handle protruding type door locking device A will be described. A non-circular shaft portion 53 is provided on one side of the joint cam 56 inserted into the small diameter hole 32 of the shaft portion 27 of the handle 26. A non-circular hole 57 for engagement is provided, and a cam 58 provided on the other side of the joint cam 56 engages with the lock plate 33. The lock plate 33 is engaged with a locking recess 59 provided on the inner peripheral surface of the lock case 20 when the handle 26 is retracted in the lock case 20 (see FIGS. 1 and 2).

When the key inserted in the key hole 37 is rotated in the unlocking direction, the cam 58 of the joint cam 56 pushes the lock plate 33 in the retracted direction, and the engagement between the lock plate 33 and the locking recess 59 is released. As a result, the handle 26 protrudes, and the handle 26 can be rotated. Handle 2
When 6 is rotated in the unlocking direction, the sleeve 23 is rotated together with the handle 26, and the engagement between the tongue (not shown) provided at the rear end of the sleeve 23 and the case of the vending machine is released to open the door. It will be possible.

Next, the operation of the drill breakage prevention type cylinder lock C of the present invention will be described. When the lock device A for doors with a protruding handle is equipped with a cylinder lock C for preventing breakage of drills, the front part of the cylinder lock C for preventing breakage of drills does not accept drilling. Even if the surface of the door D located at a position away from C is diagonally drilled toward the side surface of the cylinder lock C, the tool blocking member 48
Alternatively 48 'prevents drilling.

Non-circular shaft portion 5 of rotor 36 of cylinder lock C
Even if you try to drill towards 3, the tool blocking material 52
Prevents drilling. Thus, it is possible to prevent the malicious crime of laterally destroying the cylinder lock C. Since the present invention utilizes the male screw 40 of the case 35, the flat surface portion 39, and the non-circular shaft portion 53 of the rotor 36, which are also provided in common cylinder locks, the present invention can also be attached to existing cylinder locks. You can

[0027]

Since the present invention is constructed as described above, it has the following effects. (1) Since the drill lock prevention type cylinder lock of the present invention also prevents side damage of the cylinder lock, it is possible to reliably prevent crime. (2) The tool blocking member used in the present invention utilizes a standardized male screw, a flat surface portion and a non-circular shaft portion of a rotor commonly used in various cylinder locks. Can be retrofitted. (3) The tool blocking member used in the present invention is extremely easy to install and convenient because it can be installed at a predetermined position of the cylinder lock.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view illustrating a state in which a drill breakage prevention type cylinder lock is attached and attached to a door locking device.

FIG. 2 is a vertical sectional view of a door locking device equipped with a drill breakage prevention type cylinder lock.

FIG. 3 (A) and FIG. 3 (B) are perspective views showing a locked state and an unlocked state of the handle protruding type door locking device.

FIG. 4 is a perspective view illustrating a method of fixing a cylinder lock.

FIG. 5 is a perspective view of a tool blocking member and a cylinder lock of the first embodiment.

FIG. 6 is a perspective view of a tool blocking member and a cylinder lock of the second embodiment.

FIG. 7 is a front view of a tool blocking member according to a second embodiment.

FIG. 8 is a side view of a cylinder lock equipped with a tool blocking member according to a third embodiment.

9 is a view taken in the direction of arrow X in FIG.

FIG. 10 is a front view of a tool blocking member according to a third embodiment.

FIG. 11 is a vertical cross-sectional view showing a conventional example of a cylinder lock for preventing breakage of a drill.

FIG. 12 is a cross-sectional view showing another conventional example of a drill breakage prevention type cylinder lock.

FIG. 13 is a perspective view showing still another conventional example of the drill breakage prevention type cylinder lock.

[Explanation of symbols]

 A Door locking device C Drill breakage prevention type cylinder lock D Door 20 Lock case 23 Sleeve 26 Handle 27 Shaft part 35 Case 36 Rotor 38 Collar part 39 Flat part 40 Male screw 43 Stopper 46 Serrated protrusion 48, 48 'Tool blocking material 49 Female screw 50 Annular protrusion 51 Positioning leg portion 52 Tool blocking member 53 Non-circular shaft portion 54 Through hole

Claims (4)

[Claims] 1. A drill breakage prevention type cylinder lock in which a tool blocking member made of steel ball or cemented carbide is built in the front part of the cylinder lock, wherein the tool blocking member formed in a cylindrical shape by cemented carbide is used as a cylinder case. Drill break prevention type cylinder lock characterized by being attached to the outer peripheral surface of. 2. A drill breakage prevention type cylinder according to claim 1, wherein an inner thread of said tool blocking member is provided with a female screw which is screwed into a male thread screwed on the outer circumferential surface of said cylinder case. Tablets. 3. A positioning leg portion, which is guided by a flat surface portion formed on an outer peripheral surface of the cylinder case and abuts on a flange portion formed at a tip end portion of the cylinder case, is provided on an end surface of the tool blocking member. The drill breakage prevention type cylinder lock according to claim 1. 4. A drill breakage prevention type cylinder lock in which a tool blocking member made of steel ball or cemented carbide is built in the front part of the cylinder lock, wherein a through hole is formed in the plate blocking tool blocking member made of cemented carbide. A drill breakage prevention type cylinder lock, characterized in that the through hole is fitted in the shaft portion of the rear portion of the rotor of the cylinder lock.