JP3105144B2 - 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 cylinder lock for preventing a malicious crime that destroys the function of a cylinder lock by drilling from the front of the cylinder lock.

[0002]

2. Description of the Related Art A cylinder lock is disclosed in Japanese Unexamined Patent Publication No. Hei 6-200666.
As described in Japanese Patent Application Laid-Open Publication No. H10-209, the apparatus includes a cylindrical case 1 and a plug 2 rotatably inserted into the inner peripheral surface of the case 1 (see FIG. 10). The case 1 is provided with a plurality of driver pin holes 3 penetrating from the outer peripheral surface to the inner peripheral surface, and a cover 4 for closing the driver pin holes 3 is provided on the outer peripheral surface of the case 1. The driver pin 5 and the spring 6 are inserted, and the driver pin 5 is urged by the spring 6 in a direction to protrude from the inner peripheral surface of the case 1.

The plug 2 is provided with a key hole 7 opened on the front surface and a tumbler pin hole 8 connected to the outer peripheral surface from the key hole 7 and overlapping each driver pin hole 3 at a locking angle. 9 is inserted. At the time of locking, the tip of the driver pin 5 is engaged with the tumbler pin hole 8, so that the plug 2 cannot be rotated to the unlocking angle.

When a regular key is inserted into the keyhole 7, the tumbler pin 9 pressed by the key pushes the driver pin 5, and the contact surface between the tumbler pin 9 and the driver pin 5 is a shear line (the outer peripheral surface of the plug 2). And the plug 2 becomes rotatable. When the plug 2 is rotated to the unlocking angle by the inserted key, the tongue 10 fixed to the rear end of the plug 2 moves to the position where the lock is released, so that the door or the like can be opened.

In order to illegally unlock the locked cylinder lock, the periphery of the shear line is drilled from the front of the cylinder lock, and the driver pin 5 and the tumbler pin 9 are destroyed.
A malicious crime of losing the locking function of the cylinder lock and illegally unlocking it may occur. Means for preventing drilling to prevent such crimes have long been known. FIG. 10 shows an example of this, in which a bulging portion 2a having a large-diameter outer peripheral surface formed at the tip of the plug 2 is provided to cover the shear line, and a steel ball storage chamber is formed from the outer peripheral surface of the bulging portion 2a. 11 is pierced, and a steel ball 12 having a hardness that does not accept the cutting edge of the drill is inserted into the steel ball storage chamber 11, and then the lid 13 is attached.

[0006] In the cylinder lock provided with the perforation preventing means, when the periphery of the shear line is to be destroyed by the drill from the front, the cutting edge of the drill has a high hardness.
In the case of No. 2, the idling steel ball 12 prevents cutting of the drill. Surface hardness of the steel ball 12, has a high hardness not accept the cutting edge of the drill, it can not be cut steel balls 12. Thus, breaking of the cylinder lock by the drill is prevented.

[0007]

When the driver pin 5 and the tumbler pin 9 are provided at two locations above and below the cylinder lock, steel that protects the periphery of the shear line at two locations above and below the bulging portion 2a of the plug 2. The ball 12 can be provided to prevent breakage by a drill, but it cannot prevent the breakage of the drill around the keyhole 7, and the keyhole is formed on the outer periphery of the plug as in a cylinder lock described in Japanese Utility Model Application Laid-Open No. 6-51443. For those that reach, it is not possible to prevent drill breakage of the keyhole 7.

When a bolt 14 for tightening the tongue 10 is provided at the rear end of the plug 2, as shown in FIG. It is impossible to prevent a malicious crime that destroys the tongue 10 and loses the locking function of the tongue 10. SUMMARY OF THE INVENTION An object of the present invention is to provide a cylinder lock with excellent anti-theft properties that protects the periphery of the keyhole 7 or the inner bottom of the keyhole 7 from drill breakage.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a case where a driver pin is inserted into a driver pin hole which is formed in a cylindrical shape and penetrates an inner peripheral surface, and a case where the case is rotated by the case. A keyhole opening on the front surface, a keyhole opening on the front surface, a plug penetrating through the outer peripheral surface from the keyhole, and a tumbler pin being inserted into a tumbler pin hole opposite to the driver pin hole; A large-diameter inner peripheral surface is provided between the front surface and the driver pin hole, and a bulge portion is provided on the outer peripheral surface of the plug to be inserted into the large-diameter inner peripheral surface. Forming a mating recess reaching the hole,
A drill break prevention member made of a high-hardness material such as a cemented carbide is fitted into the fitting concave portion, and a steel ball for preventing shear line breakage located on an extended line of the outer peripheral surface of the plug is turned into the bulging portion. A steel ball storage chamber for movably storing was provided.

Alternatively, a large-diameter inner peripheral surface is provided between the front surface of the case and the driver pin hole, and a bulged portion is provided on the outer peripheral surface of the plug to be inserted into the large-diameter inner peripheral surface. A steel ball storage chamber for rotatably storing a shear line breaking prevention steel ball positioned on an extension of the outer peripheral surface of the plug is provided at the protruding portion, and a steel ball storage chamber provided near the key hole in the plug. A steel ball for preventing breakage around the keyhole is rotatably accommodated in the steel ball storage chamber, and from a middle point between the steel ball for preventing breakage of the shear line and the steel ball for preventing breakage around the keyhole. A steel ball storage chamber was provided behind the plug, and a steel ball for preventing keyhole penetration was rotatably stored in the steel ball storage chamber. In the cylinder lock or the cylinder lock other than the above, a steel ball storage chamber is provided in the plug behind the keyhole, and a steel ball for preventing a keyhole penetration is rotatably stored in the steel ball storage chamber.

[0011]

The cylinder lock constructed as described above is locked and unlocked in the same manner as a conventional cylinder lock. During locking, even if a drill is applied to the front surface of the cylinder lock to attempt to pierce and break around the shear line of the cylinder lock, the cutting edge is hit by the steel ball for preventing the shear line of the plug from being cut, so that cutting is prevented.

The keyhole is made of a high-hardness material such as a cemented carbide, and is prevented from being broken by a drill breakage preventing member having a groove forming a part of the keyhole or a steel ball for preventing breakage around the keyhole. . If there is a risk that the rear part of the rotor and the parts fixed thereto will be destroyed by penetrating the keyhole with a drill, crime can be prevented by providing a steel ball for preventing keyhole penetration.

[0013]

Embodiments of the present invention will be described with reference to the drawings. The same parts as those in the conventional example are denoted by the same reference numerals, and detailed description thereof will be omitted. As shown in the longitudinal sectional view of the cylinder lock of FIG. 1, a large-diameter inner peripheral surface 1a is provided at the front of the case 1,
A plurality of driver pin holes 3 are provided at two upper and lower portions of the case 1 in an axial direction of the case 1, and a groove 15 overlapping each driver pin hole 3 is provided on an outer peripheral surface of the case 1.
A cover 16 for closing each driver pin hole 3 is provided in the groove 15.
Is fixed, and the driver pin 5 is inserted into each driver pin hole 3.
And the spring 6 is inserted.

The plug 2 rotatably inserted into the case 1 is provided with a keyhole 7 and a tumbler pin hole 8, and the tumbler pin 9 is inserted into the tumbler pin hole 8 as in the conventional example (FIG. 1). 1). A bulging portion 2a to be inserted into the large-diameter inner peripheral surface 1a is provided at a distal end portion of the outer peripheral surface of the plug 2, and a bottomed steel ball storage chamber 17 is provided at two locations above and below the bulging portion 2a (FIG. 4).

The steel ball 18 for preventing breakage of the shear line inserted into the steel ball storage chamber 17 is machined to have a high hardness not accepting a cutting tool, and is located in front of the shear line. Side driver pin 5 and tumbler pin 9 are protected. The size of the steel ball 18 for preventing shear line destruction is slightly smaller than that of the steel ball storage chamber 17, so that the steel ball 18 can rotate inside the steel ball storage chamber 17.

As shown in FIG. 4, since the keyhole 7 is located at a position eccentric to one side of the bulging portion 2a of the plug 2, the bulging portion 2a
(See FIG. 5) formed from the outer peripheral surface of the fitting recess 30 reaching the keyhole 7 and made of a high hardness material such as cemented carbide.
A drill break prevention member 31 formed in the same shape as the above is fitted into the fitting concave portion 30 (see FIG. 6). Furthermore, focusing on the fact that there is a space on the other side of the bulging portion 2a to form a steel ball storage chamber,
When a steel ball storage chamber 19 with a bottom is drilled from the outer peripheral surface of the bulging portion 2a and the steel ball 20 for preventing breakage around the keyhole is rotatably stored in the steel ball storage chamber 19, the keyhole 7 is formed. Both sides are protected.

The tumbler pin holes 8 on the upper side and the lower side are arranged at a constant pitch, respectively, and the arrangement on the upper side and the lower side is shifted from each other by half a pitch. and lower side tumbler pin holes 8a, above the lower side tumbler pin holes 8b on the front side of the most cylinder lock, it is provided a steel ball housing chamber 21 and 22 for protecting the lower and upper keyhole 7, housed steel balls Steel balls 23 and 24 for preventing breakage around the keyhole are rotatably accommodated in the chambers 21 and 22, respectively (see FIGS. 7 and 8).

The opening of the steel ball storage chamber 19 is covered by the large-diameter inner peripheral surface 1a of the case 1, and the steel ball storage chambers 21 and 22 are provided.
Is covered by the inner peripheral surface of the case 1,
It is not necessary to cover the steel ball storage chambers 19, 21 and 22.
The steel balls 23 and 24 for preventing breakage around the keyhole are located axially rearward of the plug 2 from the middle between the steel ball 18 for preventing breakage of the shear line and the steel ball 20 for preventing breakage around the keyhole.
Even if a drill is attempted from a portion where the steel ball 18 for preventing shear line destruction 18 is not disposed, the steel balls 23 and 24 for preventing destruction around the keyhole are prevented, so that the periphery of the keyhole 7 is destroyed by drilling. Unauthorized unlocking is prevented.

Further, steel balls 23 and 24 for preventing destruction around the keyhole.
Are arranged in the vertical direction of the driver pin 5, so that the steel balls of the bulging portion 2a need only be arranged in one row, and the entire cylinder lock does not become long. At the rear end of the plug 2, a non-circular shaft portion 2 having two opposing outer peripheral surfaces formed on a flat surface 25 a
5 is provided, and a non-circular hole 26 of a tongue 26 is formed in the shaft portion 25.
a is inserted (see FIG. 2). Tongue 26 is plug 2
Turns to the position where the lock is released when it turns to the unlocking angle.

On one flat surface 25a of the shaft portion 25, a steel ball accommodating chamber 27 located behind the keyhole 7 is bored. In the steel ball accommodating chamber 27, a steel ball 28 for preventing keyhole penetration is provided. After being rotatably accommodated, the lid 29 is attached (see FIG. 9). Steel balls accommodating chamber 27, so provided behind the keyhole 7, keyhole 7
Does not interfere with the keyhole penetration preventing steel ball 28.

Next, the operation of the cylinder lock configured as described above will be described. Since the locking and unlocking operations are the same as those of the conventional cylinder lock, only the prevention of theft during locking will be described. When a drill is applied to the front surface of the locked cylinder lock to attempt to pierce and break around the shear line of the cylinder lock, the cutting edge is hit by the steel ball 18 for preventing the shear line of the plug from being cut, thereby preventing cutting.

When the shear line side of the keyhole 7 is to be broken, the drill break prevention member 31 prevents the drill from breaking. When the other three sides of the keyhole 7 are to be destroyed, when the steel balls 20, 23, 24 for preventing breakage around the keyhole are provided, the cutting edge of the drill which is to destroy the periphery of the keyhole 7 is provided. Is prevented by any of the steel balls 20, 23, 24 for preventing breakage around the keyhole. In the cylinder lock of the type shown in FIG. 10, the bolt 14 is broken by a drill
May lose the lock function and may be unlocked,
This can be prevented by providing the steel ball 28 for preventing keyhole penetration. Steel ball for preventing shear line destruction 18,
The steel balls 20, 23, 24 for preventing breakage around the keyhole and the steel balls 28 for preventing keyhole penetration can be appropriately selected and provided.
It is possible to provide all steel balls simultaneously in one cylinder lock.

[0023]

The present invention is configured as described above, and has the following effects. (1) Since the steel ball for preventing the shear line from breaking protects the periphery of the shear line, it is possible to prevent a malicious unauthorized unlocking of the tumbler pin or the driver pin by a drill. (2) When trying to break the end of the keyhole on the shear line side, the drill break prevention member prevents the break. (3) When attempting to destroy the periphery of the other three sides of the keyhole, the steel ball for preventing destruction around the keyhole prevents malicious unauthorized unlocking aimed at destroying the keyhole, tumbler pin, and falling off. I do. (4) Unauthorized unlocking, which breaks the tongue bolt by penetrating the keyhole and destroying the tongue locking function, can be prevented by providing a keyhole penetration prevention steel ball. (5) Since the above various steel balls can be provided simultaneously in one cylinder lock, the anti-theft property of the cylinder lock becomes extremely high.

[Brief description of the drawings]

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

FIG. 2 is a rear view of the cylinder lock.

FIG. 3 is a partially cutaway front view of the cylinder lock.

FIG. 4 is a sectional view taken along line WW of FIG. 1;

FIG. 5 is a side view of a fitting recess of a plug and a drill breakage preventing member inserted into the fitting recess.

FIG. 6 is a perspective view of a main part of FIG.

FIG. 7 is a sectional view taken along line XX of FIG. 1;

FIG. 8 is a sectional view taken along line YY of FIG. 1;

FIG. 9 is a sectional view taken along the line ZZ of FIG. 1;

FIG. 10 is a longitudinal sectional view showing a conventional example of a perforation prevention type cylinder lock.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 1a Large diameter inner peripheral surface 2 Plug 2a Swelling part 3 Driver pin hole 5 Driver pin 7 Key hole 8 Tumbler pin hole 9 Tumbler pin 17, 19 Steel ball storage chamber 18 Steel ball for preventing shear line breakage 21, 22 Steel ball storage Chambers 20, 23, 24 Steel balls for preventing breakage around keyhole 27 Steel ball storage chamber 28 Steel balls for preventing keyhole penetration 30 Fitting recess 31 Drill breakage prevention member

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-164985 (JP, A) JP-A-6-200666 (JP, A) JP-A-7-217270 (JP, A) 22392 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E05B 15/16 E05B 15/00 E05B 17/00 E05B 17/20

Claims (4)

(57) [Claims] 1. A case in which a driver pin is inserted into a driver pin hole which is formed in a cylindrical shape and penetrates an inner peripheral surface, a case is rotatably inserted into the case, and a key hole is opened in a front surface. A cylinder lock having a plug penetrating the outer peripheral surface from the hole and inserting the tumbler pin into the tumbler pin hole facing the driver pin hole, wherein a large-diameter inner peripheral surface is provided between the front surface of the case and the driver pin hole. An outer peripheral surface of the plug is provided with a bulged portion to be inserted into the large-diameter inner peripheral surface, and a fitting concave portion reaching the key hole from the outer peripheral surface of the bulged portion is formed. Drill break prevention member made of high hardness material such as cemented carbide is inserted,
A cylinder lock, wherein the bulging portion is provided with a steel ball accommodating chamber for rotatably accommodating a steel ball for preventing shear line destruction positioned on an extension of an outer peripheral surface of the plug. 2. A case in which a driver pin is inserted into a driver pin hole that is formed in a cylindrical shape and penetrates an inner peripheral surface, a case that is rotatably inserted into the case, and a key hole is opened in a front surface. A cylinder lock having a plug penetrating the outer peripheral surface from the hole and inserting the tumbler pin into the tumbler pin hole facing the driver pin hole, wherein a large-diameter inner peripheral surface is provided between the front surface of the case and the driver pin hole. A bulging portion to be inserted into the large-diameter inner peripheral surface is provided on the outer peripheral surface of the plug, and a steel ball for preventing shear line destruction positioned on an extension of the outer peripheral surface of the plug is provided on the bulging portion. A steel ball storage chamber for movably storing the steel ball is provided. A steel ball storage chamber close to the keyhole is formed in the plug, and a steel ball for preventing breakage around the keyhole can be rotated in the steel ball storage chamber. The steel ball for preventing shear line destruction and destruction around the keyhole A cylinder lock, comprising: a steel ball storage chamber provided behind the plug from an intermediate point with the prevention steel ball, and a key hole penetration prevention steel ball rotatably stored in the steel ball storage chamber. 3. A steel ball storage chamber is provided in the plug behind the keyhole, and a steel ball for preventing keyhole penetration is rotatably stored in the steel ball storage chamber. Cylinder lock. 4. A case in which a driver pin is inserted into a driver pin hole which is formed in a cylindrical shape and penetrates an inner peripheral surface, a case is rotatably inserted into the case, and a key hole is opened in a front surface. A cylinder lock provided with a plug that penetrates the outer peripheral surface from the hole and into which the tumbler pin is inserted in the tumbler pin hole opposite to the driver pin hole, wherein the plug is provided with a steel ball receiving chamber behind the key hole; A cylinder lock in which a steel ball for preventing keyhole penetration is rotatably housed in a housing chamber.