JP2008261118A - Cylinder lock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylinder lock for use in a door of a vehicle or a building, which surely prevents fraudulent unlocking by a simple constitution. <P>SOLUTION: This cylinder lock comprises a cylindrical holder 10 with an engaging groove 18, a cylinder 20 which is rotatably arranged in a holder 10, and a tumbler 32 which is arranged in the cylinder 20. The cylinder lock is put into an irrotational state by engaging the tumbler 32 with the engaging groove 18, and put into a rotatable state by receding the tumbler 32 and disengaging it from the engaging groove 18. The cylinder 20 is provided with a portion (a flange portion 22) to be fractured in a longitudinal direction along a key inserting direction; the holder 10 is provided with a rotation inhibiting portion 16; and the cylinder 20 is provided with an engaging portion (holding portion 28). When an overload is applied along the key inserting direction, the cylinder 20 is fractured along the portion (22); a front side portion 20A of the cylinder is moved forward in the key inserting direction so that the irrotational portion 16 can be engaged with the engaging portion (28); and the front side portion 20A becomes irrotational with respect to the holder 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cylinder lock used for a door of a vehicle or a building, and more particularly, to a cylinder lock which can prevent unauthorized unlocking by inserting an unauthorized key such as a flat-blade screwdriver and forcibly rotating it. is there.

  This type of cylinder lock has a structure in which a cylinder in which a tumbler is disposed so as to be able to advance and retreat is rotatably disposed inside a holder having an engagement groove. Then, when a regular key having a mechanical structure is inserted into the cylinder, the key pile of the key comes into contact with the inner peripheral edge of the through hole of the tumbler, so that all the tumblers are retracted into the cylinder. As a result, the engagement between the tumbler and the engaging groove of the holder is released, and the cylinder can rotate with respect to the holder.

  However, this cylinder lock applies a large load (overload) that cannot be generated by inserting a normal key by hitting a tool such as a flat-blade screwdriver into the cylinder as a non-normal key, and the tumbler or cylinder itself can be destroyed. There is sex. In this case, the front side of the cylinder connected to the locking device that locks and unlocks the door can rotate with respect to the holder, and is unlocked illegally.

  The present invention relates to a cylinder lock for preventing such unauthorized unlocking, and related prior art document information includes the following.

JP 07-189533 A

  In this patent document, a cylindrical holder, a sleeve rotatably disposed inside the holder, a cylinder rotatably disposed inside the sleeve, and a cylinder retractably accommodated A plurality of tumblers, a lock lever disposed at the rear portion of the cylinder so as to be movable in the axial direction between an engagement position and a disengagement position, a movable bar disposed at the sleeve so as to be movable, and a holder The cylinder lock provided with the cam part arrange | positioned by the inner peripheral part corresponding to the movable bar is described.

  In the cylinder lock of this patent document, when an irregular key is inserted and the cylinder is rotated, the sleeve rotates together with the cylinder. If it does so, a movable bar will be pushed and moved by the cam part of the inner peripheral part of a holder, and a lock lever will be moved to a back engagement release position. As a result, since the engagement between the lock lever and the cylinder is released, the lock lever is not rotated, so that the unauthorized unlocking cannot be performed.

  However, this cylinder lock has a problem that the number of parts such as a movable bar increases in order to release the connection between the cylinder and the lever.

  It is an object of the present invention to provide a cylinder lock that can reliably prevent unauthorized unlocking with a simple configuration.

  In order to solve the above problems, a cylinder lock according to the present invention includes a cylindrical holder having an engagement groove extending along an axial direction on an inner peripheral surface, and a substantially cylindrical shape rotatably disposed in the holder. A cylinder and a plurality of tumblers disposed so as to be movable back and forth in a direction perpendicular to the rotation axis direction with respect to the cylinder, and the tumbler advances from the outer peripheral surface of the cylinder when the regular key is not inserted into the cylinder. While being unable to rotate by engaging with the engaging groove, the tumbler is retracted into the cylinder when the regular key is inserted and can be rotated by releasing the engagement with the engaging groove. In the cylinder lock, the cylinder is provided with a breakable portion for breaking the cylinder before and after the insertion direction of the regular key, and the holder is rotated in front of the breakable portion in the key insertion direction. When a blocking part is provided In addition, the cylinder is provided with an engaging portion that is located in front of the to-be-broken portion in the key insertion direction and behind the rotation prevention portion in the key insertion direction. When an overload is applied along the cylinder, the cylinder breaks along the to-be-broken portion, and the front side portion of the broken cylinder moves forward in the key insertion direction with respect to the holder so that the rotation preventing portion and the engaging portion are By engaging, the cylinder front side part cannot be rotated with respect to the holder.

  According to the cylinder lock of the present invention, since the ruptured portion is provided in the cylinder, when the driver or the like for the purpose of theft is struck, the cylinder is broken back and forth along the ruptured portion. Since the holder is provided with a rotation preventing portion and an engaging portion is provided on the front side of the cylinder connected to the locking device, the rotation preventing portion is moved when the front side of the cylinder moves along the key insertion direction. And the engaging portion engage. As a result, the rotation of the front side of the cylinder is prevented, so that unauthorized unlocking can be prevented without increasing the number of parts.

  In this cylinder lock, it is preferable that the holder is provided with a stopper portion that suppresses the forward movement of the cylinder front side portion in the key insertion direction. In this way, the rotation blocking state of the cylinder front side can be reliably maintained.

  Preferably, the cylinder includes an urging unit that returns the cylinder to a neutral position when the regular key is not inserted, and the engaging portion of the cylinder is configured by a holding unit that holds the urging unit. Thus, it can implement, without increasing a number of parts by comprising an engaging part by the holding part of the existing biasing member conventionally.

  In the cylinder lock of the present invention, even if the driver is struck for the purpose of theft and the cylinder is destroyed, the rotation of the cylinder relative to the holder is prevented by the engagement between the rotation prevention portion of the holder and the engagement portion of the cylinder. The Therefore, unauthorized unlocking by forcibly rotating the cylinder can be prevented without increasing the number of parts.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 5 show a cylinder lock according to a first embodiment of the present invention. This cylinder lock is attached to a door of a vehicle or a building, and generally includes a holder 10, a cylinder 20, and a plurality of tumblers 32, and a lock having a lock bolt at one end of the cylinder 20 protruding from the holder 10. A lock lever 39 for connecting to a device (not shown) is provided.

  As shown in FIGS. 1 and 3, the holder 10 has a cylindrical shape in which the diameter of the inner peripheral surface thereof is slightly larger than the diameter of the outer peripheral surface of the cylinder 20. In the holder 10, a cylinder 20 is disposed in a cylinder housing portion 12 that is an internal space from an opening portion on a side where a bracket portion 11 for mounting on a mounting portion of a door (not shown) is provided. The opening is provided with an expanded portion 13 having a diameter larger than the diameter of the cylinder housing portion 12, and a flange locking portion 14 is constituted by a step portion formed therebetween. Further, the holder 10 is closed at the opposite end of the bracket portion 11, and an insertion hole 15 through which the lever mounting portion 25 integrally formed with the cylinder 20 is inserted is formed in the closed portion. As shown in FIGS. 3 and 5, the rotation blocking portion 16 is formed around the inner surface side of the insertion hole 15 by a concave groove recessed forward in the key insertion direction, which is the axial direction, so as to form a substantially C shape. Is provided. Further, as shown in FIGS. 2 and 3, in the vicinity of the insertion hole 15 of the holder 10, a locking hole for locking a neutral spring 30 that urges the cylinder 20 to a neutral position along the rotation direction. 17 is provided so as to penetrate from inside to outside. In the present embodiment, a pair of opposing engaging grooves 18 extend radially outwardly on the inner peripheral surface of the holder 10 so as to extend along the axial direction from the expanded portion 13 to the locking hole 17. It is provided so as to be recessed. Moreover, the bottom of the rotation prevention part 16 which is the obstruction | occlusion part of the holder 10 comprises the stopper part 19 which suppresses the movement to the front of the key insertion direction of the cylinder 20 mentioned later.

  As shown in FIGS. 1 and 3, the cylinder 20 has a cylindrical shape that is rotatably disposed in the holder 10. Specifically, one end of the cylinder 20 is closed, and a key insertion hole 21 having a shape corresponding to a regular key is formed on the closed surface. Further, the end portion in which the key insertion hole 21 is formed is provided with a flange portion 22 that protrudes radially outward and is positioned in contact with the flange locking portion 14. A plurality of (eight in the present embodiment) tumbler insertions that communicate with the key insertion holes 21 at predetermined intervals along the axial direction so as to extend in a direction perpendicular to the axial direction from the opposing positions on the outer peripheral surface of the cylinder 20. Holes 23 are juxtaposed. The tumbler insertion hole 23 is formed with a hole receiving portion 35 for inserting the spring receiving portion 35 and the spring 34 of the tumbler 32 on one side. The key insertion hole 21 is closed at the opposite side to the flange portion 22 in the key insertion direction, and a cylindrical lever mounting portion 25 for providing a lock lever 39 described later is provided at the closed end. . The lever mounting portion 25 protrudes along the axial direction of the cylinder 20, and a pair of positioning convex portions 26 that protrude radially outward from the facing position are provided at the base portion. Further, in the lever mounting portion 25, a retaining groove 27 for retaining the ring is provided at the tip of the positioning convex portion 26. Further, in the vicinity of the lever mounting portion 25, in order to dispose the neutral spring 30, a substantially cylindrical shape protruding forward in the key insertion direction so as to form a substantially C shape from the outer peripheral edge of the front end surface of the cylinder 20. A holding unit 28 is provided. In the holding portion 28, the notched lower end opening portion matches the key insertion direction with respect to the locking hole 17 of the holder 10, and the expansion angle in the circumferential direction matches to lock the neutral spring 30. An engaging groove 29 is formed. In this embodiment, as shown in FIG. 5, the distal end portion of the C-shaped holding portion 28 having the locking groove 29 is configured as an engaging portion that coincides with the rotation preventing portion 16. . In addition, the cylinder 20 is formed of zinc, and the base portion of the flange portion 22 whose thickness is increased constitutes a portion to be broken that causes the cylinder 20 to be broken back and forth when an overload is applied.

  As shown in FIG. 1, the neutral spring 30 which is an urging means is a wire wound in a spiral shape, and is engaged with a locking hole 17 of the holder 10 and a locking groove 29 of the cylinder 20 at both ends thereof. A locking portion 31 is provided to stop. When the cylinder 20 is rotated with respect to the holder 10 in a neutral state in which the locking portions 31 and 31 are locked to the edges of the locking holes 17 and the locking grooves 29, The first locking portion 31 is locked in the locking hole 17, and the other locking portion 31 is locked in the locking groove 29. When the operating force for rotating the cylinder 20 is released, the contraction is released, thereby returning the cylinder 20 to the neutral position before the rotation (when the regular key is not inserted).

  The tumbler 32 has a plate shape, and can be advanced and retracted in a direction perpendicular to the rotation axis direction with respect to the cylinder 20 by being mounted in the tumbler insertion hole 23 of the cylinder 20. As shown in FIGS. 1 and 3, the tumbler 32 has a rectangular through hole 33 formed in the center thereof. On one side edge of each tumbler 32, a spring receiving portion 35 that abuts one end of the spring 34 protrudes. Further, each tumbler 32 constitutes an engaging convex portion 36 in which one end in the advancing direction, which is an urging direction by the spring 34, is engaged with the engaging groove 18 of the holder 10. When the regular key is inserted into the through-hole 33, the edge of the through-hole 33 is pressed by the key crest of the key, so that it is retracted against the urging force of the spring 34 and enters the cylinder 20. Thus, the engagement between the engagement protrusion 36 and the engagement groove 18 is released.

  In the cylinder lock having the above-described configuration, the neutral spring 30 is disposed in the holder 10 through the locking hole 17. In addition, with the spring 34 disposed in the expanded hole portion 24 of the cylinder 20, the tumbler 32 is disposed in the tumbler insertion hole 23, and each tumbler 32 is pressed inward in the radial direction to be immersed in the cylinder 20. In this state, the cylinder 20 is inserted from the side of the expanding portion 13 of the holder 10, and the lever mounting portion 25 of the cylinder 20 is inserted through the neutral spring 30 and disposed inside the holding portion 28. Then, the lever mounting portion 25 of the cylinder 20 is inserted through the insertion hole 15 to protrude, and the flange portion 22 is brought into contact with the flange locking portion 14 of the holder 10. In this state, as shown in FIG. 2 and FIG. 3, the cover 37 is disposed in the opening of the holder 10 to close the cover so as to cover the protruding portion of the cylinder 20 protruding from the holder 10. The cover 37 is provided with a key insertion hole 38 through which a regular key is inserted.

  As shown in FIG. 1, the lock lever 39 to be mounted on the lever mounting portion 25 is provided with a connecting portion 41 for connecting to the locking device from the mounting portion 40 to be mounted on the lever mounting portion 25 of the cylinder 20. Is. The mounting portion 40 is provided with a pair of positioning concave portions 42 corresponding to the positioning convex portions 26 of the cylinder 20, and the engagement thereof prevents the lock lever 39 from rotating with respect to the cylinder 20. Further, the lock lever 39 is maintained in the mounted state by disposing a retaining metal fitting 43 made of a C-shaped plate in the retaining groove 27 of the cylinder 20 positioned in the front in the insertion direction.

  Next, the operation of the cylinder lock will be specifically described.

  First, without inserting the regular key into the cylinder 20, when the regular key locked or unlocked by the locking device is not inserted, the cylinder 20 is positioned in the neutral position with respect to the holder 10 by the urging force of the neutral spring 30. ing. In this neutral position, as shown in FIG. 3, the engaging convex portion 36 of the tumbler 32 disposed in the cylinder 20 protrudes from the outer peripheral surface by the urging force of the spring 34 and advances into the engaging groove 18 of the holder. Engage. Therefore, the cylinder 20 maintains a state where it cannot rotate with respect to the holder 10.

  When a regular key is inserted into the key insertion hole 21 of the cylinder 20 in this state, the regular key passes through the through-hole 33 of the tumbler 32, so that each tumbler 32 is retracted and immersed in the cylinder 20, The engagement with the joint groove 18 is released. As a result, the cylinder 20 becomes rotatable with respect to the holder 10 in the circumferential direction.

  As a result, the user rotates the key in the locking direction (clockwise) or the unlocking direction (counterclockwise) and rotates the cylinder 20 and the lock lever 39 in conjunction with each other, thereby locking or unlocking the locking device. Can do. In this state, when the user releases his / her hand from the regular key, the urging force of the neutral spring 30 causes the cylinder 20 to rotate with respect to the holder 10 to return to the neutral position before the operation.

  On the other hand, when the non-user inserts a non-regular key other than the regular key, for example, a flat-blade screwdriver into the key insertion hole 21 and strikes it so as to apply a large load (overload) that does not occur when a normal regular key is inserted, as shown in FIG. As described above, the cylinder 20 is broken by the overload from the base portion of the flange portion 22 constituting the broken portion into the cylinder front side portion 20A and the cylinder rear side portion 20B.

  Conventionally, by forcibly rotating the unauthorized key in this state, each tumbler 32 is broken and the cylinder front side portion 20A can be rotated. Therefore, the lock device is operated via the lock lever 39. It was.

  However, in the present embodiment, the holder 10 is provided with the rotation preventing portion 16 positioned in front of the key insertion direction, and the holding portion 28 positioned behind the rotation preventing portion 16 is positioned as an engaging portion on the cylinder front side portion 20A. Therefore, as shown in FIG. 5, the broken cylinder front side portion 20 </ b> A moves along the key insertion direction, and the holding portion 28 engages with the rotation preventing portion 16. As a result, when the non-regular key is rotated, the locking groove 29 of the holding portion 28 comes into contact with the non-formed portion of the groove constituting the rotation preventing portion 16, so that the cylinder front side portion 20 </ b> A cannot be rotated. Unauthorized unlocking can be surely prevented.

  As described above, in the present embodiment, the existing holding portion 28 is used as the engaging portion, and the holder 10 is simply provided with a recess as the rotation preventing portion 16 so that unauthorized unlocking can be performed without increasing the number of parts. Can be prevented. In the present embodiment, the holder 10 is provided with the stopper portion 19, and the stopper portion 19 is configured to stop the forward movement of the cylinder front side portion 20 </ b> A in the key insertion direction. The engagement with the blocking portion 16 is maintained, and the rotation blocking state can be reliably maintained. Further, in the present embodiment, the cylinder 20 is maintained in the neutral position in a non-inserted state by the engagement between the tumbler 32 of the cylinder 20 and the engagement groove 18 of the holder 10 and the neutral spring 30, while in this neutral position When the cylinder 20 moves forward in the key insertion direction, the holding portion 28 and the rotation prevention portion 16 are in a position to engage with each other, so that the rotation prevention state of the cylinder front side portion 20A can be realized easily and reliably.

  6 to 8 show a cylinder lock of the second embodiment. The second embodiment is different from the first embodiment in that the configurations of the rotation blocking portion 16 of the holder 10 and the engaging portion of the cylinder 20 are changed.

  Specifically, as shown in FIG. 6 and FIG. 7, the holder 10 of the second embodiment has an opening on the opposite side to the widened portion 13, and is formed of a concave groove shown in the first embodiment. The rotation preventing portion 16 cannot be provided. Therefore, in 2nd Embodiment, the rotation prevention member through-hole 44 penetrated in a rectangular shape is provided in the side surface of the holder 10 inside and outside, and the rotation prevention member 45 which consists of another body in this rotation prevention member through-hole 44 is arrange | positioned. It is constituted by. The rotation preventing member 45 has a convex shape, and a tip 45a protruding into the cylinder housing portion 12 is provided with an arc-shaped notch. Further, the base 45b of the rotation prevention member 45 is formed slightly larger than the rotation prevention member through hole 44 and is mounted so as not to be detached by press-fitting. In this embodiment, the stopper portion that stops the forward movement of the cylinder front side portion 20A in the key insertion direction is configured by the tip portion 45a of the rotation prevention member 45.

  As with the first embodiment, the cylinder 20 of the second embodiment includes a key insertion hole 21, a flange portion 22, a tumbler insertion hole 23, a lever mounting portion 25, a holding portion 28, and a locking groove 29. It has. However, the holding portion 28 is only intended to mount the neutral spring 30 as in the conventional case, and does not constitute an engaging portion. In this embodiment, an annular insertion groove 46 corresponding to the rotation-preventing member 45 of the holder 10 is brought into contact with the outer peripheral portion at the rear of the key insertion direction in the holding portion 28 so as to be recessed inward in the radial direction. Yes. In the neutral state of the cylinder 20, an engagement portion 47 formed of a concave groove communicating with the insertion groove 46 is provided behind the distal end portion 45 a of the rotation prevention member 45 in the key insertion direction.

  In the cylinder lock of the second embodiment configured as described above, the cylinder 20 is disposed in the holder 10 with the spring 34 and the tumbler 32 disposed on the cylinder 20. And after arrange | positioning the neutral spring 30 from the opening part on the opposite side to the expansion part 13 of the holder 10, the lock lever 39 is mounted | worn and the retaining metal fitting 43 is arrange | positioned. Thereafter, the rotation prevention member 45 is press-fitted from the rotation prevention member through hole 44 to complete the assembly.

  In addition, the operation | movement by use of the regular key with respect to the cylinder lock of this 2nd Embodiment is the same as that of 1st Embodiment.

  On the other hand, when a non-user inserts a non-regular key such as a flat-blade screwdriver and strikes it so that an overload is applied forward in the key insertion direction, as shown in FIG. The base portion of the flange portion 22 is broken into the cylinder front side portion 20A and the cylinder rear side portion 20B.

  In this embodiment, the holder 10 is provided with the rotation preventing member 45 positioned in front of the key insertion direction, and the cylinder front side portion 20A is provided with the engaging portion 47 positioned behind the rotation preventing portion 16. When the broken cylinder front side portion 20 </ b> A moves along the key insertion direction, the engaging portion 47 engages with the distal end portion 45 a of the rotation prevention member 45. As a result, since the cylinder front side portion 20A cannot be rotated even if the irregular key is rotated, unauthorized unlocking can be reliably prevented.

  In addition, the cylinder lock of this invention is not limited to the structure of the said embodiment, A various change is possible.

  For example, in the above embodiment, the fractured portion is configured by the difference in thickness by the flange portion 22 provided in the cylinder 20, but a groove that is recessed in a concave shape is provided so as to form an annular shape on the outer peripheral surface. Further, by reducing the thickness of the portion, the front side portion and the rear side portion may be broken at the groove as a boundary. Moreover, it is good also considering the thin part of the location in which the tumbler insertion hole 23 was provided as a to-be-broken part. Further, the cylinder is provided with a hard shutter member provided in the vicinity of the flange portion 22 to prevent entry of a tool drill or the like into the key insertion hole 21 of the cylinder 20 and a storage hole for storing the shutter member. It is good also considering the thin part by an accommodation hole as a to-be-broken part.

It is a disassembled perspective view which shows the cylinder lock of 1st Embodiment of this invention. It is the perspective view which looked at the cylinder lock of an assembly state from the lower part. It is sectional drawing which shows the cylinder lock at the time of normal use. It is sectional drawing which shows the cylinder lock at the time of unauthorized use. It is sectional drawing which shows the rotation prevention state of 1st Embodiment. It is a disassembled perspective view which shows the cylinder lock of 2nd Embodiment. It is sectional drawing which shows the cylinder lock at the time of normal use. It is sectional drawing which shows the cylinder lock at the time of unauthorized use.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Holder 16 ... Rotation prevention part 18 ... Engagement groove 19 ... Stopper part 20 ... Cylinder 20A ... Cylinder front side part 20B ... Cylinder rear side part 22 ... Flange part (part to be broken)
28 ... Holding part (engagement part)
30 ... Neutral spring 32 ... Tumbler 37 ... Cover 39 ... Lock lever

Claims (3)

A cylindrical holder having an engagement groove extending along the axial direction on the inner peripheral surface, a substantially cylindrical cylinder rotatably disposed in the holder, and orthogonal to the rotational axis direction with respect to the cylinder A plurality of tumblers arranged so as to be able to advance and retreat in the direction, and when the regular key is not inserted into the cylinder, the tumbler advances from the outer peripheral surface of the cylinder and engages with the engagement groove so that it cannot rotate. On the other hand, in the cylinder lock which can be rotated by releasing the engagement with the engagement groove by retracting the tumbler into the cylinder when the regular key is inserted,
The cylinder is provided with a to-be-broken portion for breaking the cylinder before and after along the insertion direction of the regular key,
The holder is provided with a rotation preventing portion positioned in front of the broken portion in the key insertion direction, and the cylinder is positioned in front of the broken portion in the key insertion direction, and the rotation blocking portion is inserted in the key insertion direction. An engagement part located at the rear is provided,
If an overload is applied along the key insertion direction due to the insertion of a non-regular key, the cylinder breaks along the to-be-broken portion, and the broken cylinder front side moves forward with respect to the holder in the key insertion direction. A cylinder lock characterized in that the front side portion of the cylinder cannot be rotated with respect to the holder by the engagement of the rotation preventing portion and the engaging portion.   The cylinder lock according to claim 1, wherein the holder is provided with a stopper portion that suppresses the forward movement of the front side portion of the cylinder in the key insertion direction.   The urging means for returning the cylinder to a neutral position when the regular key is not inserted is provided, and the engaging part of the cylinder is constituted by a holding part for holding the urging means. The cylinder lock according to claim 1 or claim 2.

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