JP4353848B2 - Cylinder lock - Google Patents

Description

  The present invention relates to a cylinder lock used for, for example, an automobile door.

  2. Description of the Related Art Conventionally, so-called free wheel cylinders are used as cylinder locks for locking and unlocking automobile doors, for example. This free wheel cylinder is usually composed of a rotor in which a tumbler protrudes from an outer peripheral surface when a key is not inserted, a sleeve formed on the rotor and formed with a lock groove into which the tumbler can be engaged, and rotation of the rotor And a clutch mechanism for switching whether or not to transmit to the output member.

  In the free wheel cylinder having such a configuration, when the regular key is inserted into the rotor, the tumbler is housed in the rotor and the engagement with the lock groove of the sleeve is released, and when the regular key is rotated in this state, Only the rotor rotates independently from the sleeve, and the rotation is transmitted to the output member via the clutch mechanism.

  On the other hand, in the free wheel cylinder, when an improper key such as an incompatible key or a tool driver is inserted into the rotor, the tumbler is not housed in the rotor but remains engaged with the lock groove of the sleeve. In this state, if the rotor is rotated with an illegal key, the sleeve moves rearward in the axial direction and the clutch mechanism is disengaged, so that the rotation of the rotor is not transmitted to the output member, and the rotor rotates idle together with the sleeve. become.

  In such a freewheel cylinder, until now, a cam for moving the sleeve axially rearward is disposed on the front side of the sleeve (that is, the key insertion side). Assembly is common.

  However, the freewheel cylinder assembled from the rear side is structurally weak against punching from the front of the cylinder (inserting a screwdriver or the like into the keyhole of the rotor and striking it with a hammer, etc.), and it is easy to come out to the rear side. there were.

For example, Patent Document 1 below discloses a cylinder lock that is a freewheel cylinder in which a cylinder is inserted from the front side of a casing and a sleeve and other members are assembled from the rear side. If the front side of the is destroyed, all members may be pulled out to the rear side, and the structure is weak against punching.
Japanese Utility Model Publication 3-32215

  Accordingly, an object of the present invention is to provide a cylinder lock that is structurally strong against punching and has improved antitheft performance.

In order to solve the above-mentioned problem, the present invention includes a rotor in which a tumbler is housed inside by insertion of a regular key and is rotatable.
A clutch mechanism for transmitting the rotational force of the rotor to the output member on the rotor rear end side and releasing the connection between the rotor and the output member when an unauthorized key is inserted into the rotor and operated;
It has a locking wall on the inner peripheral surface of the rear end side, there in the cylinder lock which example Bei a holder for accommodating the rotor so as to engage the stepped portion provided at a rear portion of the rotor to the locking wall And
The clutch mechanism is
A sleeve having a locking groove that is rotatably provided between the rotor and the holder and in which the tumbler provided in the rotor enters and exits;
A slide block that is housed on the front side of the locking wall of the holder and moves in the front-rear direction by rotation of the sleeve;
A clutch that is arranged on the rear side of the locking wall of the holder and that connects or disconnects the rotor and the output member by moving in the front-rear direction;
The movement of the slide block in the front-rear direction is transmitted to the clutch through an operation hole provided penetrating the locking wall .

  According to this configuration, the locking wall that engages the stepped portion at the rear of the rotor is provided on the rear end side of the holder, so that the rotor is mounted from the front side of the holder. As a result, even if a punching attack is performed from the front side of the rotor, the rotor does not come out rearward and is unlocked, and it is structurally strong against punching, and theft prevention performance is improved.

  In the cylinder lock of the present invention, a cam portion for moving the slide block in the front-rear direction is provided at the rear end of the sleeve, and the operation hole is penetrated through the operation hole at the rear end of the slide block. You may provide the operation convex part which touches.

  According to this configuration, since the slide block, which is a member different from the sleeve, does not rotate even when the sleeve rotates, the operation hole of the locking wall through which the operation convex portion of the slide block passes can be made small. Therefore, the strength of the locking wall can be maintained and the anti-theft property is improved.

  As described above, according to the cylinder lock of the present invention, unauthorized unlocking by punching can be prevented, and the anti-theft performance is improved.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is an exploded perspective view of a cylinder lock 10 according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the cylinder lock 10. 1 and 2, the left side on the key insertion side is “front” and the right side is “rear”.

  The cylinder lock 10 includes a substantially cylindrical rotor 12. A key hole 14 is formed in the front end surface of the rotor 12. The key hole 14 is formed in the rotor 12 so as to extend in the front-rear direction (that is, in the axial direction).

  A plurality of tumbler grooves 16 are formed in the rotor 12 so as to be aligned in the front-rear direction and orthogonal to the key hole 14. A plate-shaped tumbler 18 is accommodated in each of the tumbler grooves 16. The end of the tumbler 18 protrudes on both sides from the outer peripheral surface of the rotor 12 when no key is inserted, but is retracted into the rotor 12 when the regular key is inserted.

  Further, a step portion 20 is formed at the rear portion of the rotor 12 by slightly reducing the outer diameter, and an engagement convex portion 22 is formed adjacent to the rear of the step portion 20. The engaging projections 22 are stepped portions that protrude rearward within a predetermined angle range in the circumferential direction of the rotor 12, and are provided on both sides of the rotor 12.

  Further, a C-ring groove 23 is formed at the narrowest rear end of the rotor 12. A lever-like output member 28 is attached to the rear end portion of the rotor 12, and the output member 28 is prevented from being detached by a C-ring 26 fitted in the C-ring groove 23. Here, the output member 28 is rotatably attached to the rear end portion of the rotor 12, and the rotation of the rotor 12 is transmitted to the output member 28 by a clutch mechanism described later.

  A rotor cap 24 having a key insertion hole is attached to the front end surface of the rotor 12. A front holder 30 is attached to the outer periphery of the front end portion of the rotor 12. A holder cap 32 is put on the front end portion of the front holder 30.

  A cylindrical sleeve 34 is provided on the outer periphery of the intermediate portion of the rotor 12. Two lock grooves 36 extending in the axial direction are formed on the inner peripheral surface of the sleeve 34 so as to face each other. The tumbler 18 that appears and disappears from the outer peripheral surface of the rotor 12 enters and exits these lock grooves 36. Further, on the rear end surface of the sleeve 34, two cam portions 38 protruding rearward within a predetermined angle range in the circumferential direction are provided so as to face each other in the radial direction.

  The rotor 12, the sleeve 34, and the rear end portion of the front holder 30 are accommodated in the holder 40. The front holder 30 is fixed to the holder 40 by two fixing pins 42. On the other hand, the sleeve 34 is rotatably provided between the rotor 12 and the holder 40.

  As shown in FIG. 3, two rotation-preventing concave portions 44 extending in the axial direction are provided on the inner peripheral portion of the holder 40 so as to face each other in the radial direction. Further, a locking wall 48 is formed on the inner peripheral portion on the rear end side of the holder 40 so as to protrude radially inward, leaving a central hole 46 through which the rear end portion of the rotor 12 passes. This locking wall 48 is adapted to engage with the step portion 20 of the rotor 12 inserted from the front of the holder 40. The locking wall 48 is formed with three operation holes 50 that are equally arranged in the circumferential direction.

  An annular slide block 52 is accommodated in the holder 40 on the front side of the locking wall 48 and around the rotor 12. The slide block 52 is pressed against the rear end portion of the sleeve 34 by a biasing force of a return spring described later.

  On the outer peripheral portion of the slide block 52, two anti-rotation convex portions 54 protruding outward in the radial direction are formed. The anti-rotation convex portions 54 engage with the anti-rotation concave portions 44 of the holder 40 so that the slide block 52 cannot rotate within the holder 40. On the other hand, the slide block 52 is movable in the front-rear direction within the holder 40.

  A concave portion 56 into which the cam portion 38 at the rear end portion of the sleeve 34 is fitted is formed on the front end surface of the slide block 52, and cam inclined portions 58 are formed on both sides of the concave portion 56. On the other hand, on the rear end surface of the slide block 52, three operation convex portions 60 that are equally arranged in the circumferential direction are projected. These operation convex portions 60 extend rearward through the operation holes 50 formed in the locking wall 48 of the holder 40. In addition, the operation convex part 60 is not limited to three, One or two may be sufficient, and four or more may be sufficient.

  A substantially annular clutch 62 is arranged on the rear side of the locking wall 48 in the holder 40 and around the rotor 12 so as to be movable in the front-rear direction. On the inner peripheral portion of the clutch 62, an engagement concave portion 64 is formed in which the engagement convex portion 22 of the rotor 12 is fitted and engaged. Further, as shown in FIG. 4, two engagement convex portions 66 and a spring locking convex portion 67 for locking an end portion of a return spring, which will be described later, protrude from the rear end surface of the clutch 62. The engaging convex portions 66 and the spring locking convex portions 67 are engaged with the engaging holes 28a and the engaging concave portions 28b of the output member 28, respectively.

  The clutch 62 is urged forward by a return spring 65. As a result, the front end surface of the clutch 62 is pressed against the rear end of the operation convex portion 60 of the slide block 52, and the engagement convex portion 22 of the rotor 12 is fitted in the engagement concave portion 64 of the clutch 62. ing. Further, the return spring 65 is adapted to apply a biasing force so as to return to the initial position when the clutch 62 rotates.

  In the cylinder lock 10 of the present embodiment, the sleeve 34, the slide block 52, and the clutch 62 constitute a clutch mechanism for connecting or releasing the connection between the rotor 12 and the output member 28.

Next, the operation of the cylinder lock 10 having the above configuration will be described.
When the regular key is inserted into the key hole 14 of the rotor 12, the tumbler 18 is retracted into the rotor 12 and stored, so that the engagement with the lock groove 36 of the sleeve 34 is released. This allows the rotor 12 to rotate within the sleeve 34.

  At this time, the engagement projection 22 at the rear of the rotor 12 is engaged with the engagement recess 64 of the clutch 62 so that the rotor 12 and the clutch 62 are connected. In this state, when the user turns the regular key to rotate the rotor 12, the rotation is transmitted to the output member 28 via the clutch 62, and the output member 28 rotates.

  On the other hand, when an unauthorized key 70 such as a non-conforming key (or a tool driver) is inserted into the key hole 14 of the rotor 12, the tumbler 18 remains protruding from the outer peripheral surface of the rotor 12 without being retracted, as shown in FIG. In the state, it engages with the lock groove 36 of the sleeve 34. When the rotor 12 is rotated by operating the unauthorized key 70 in this state, the sleeve 34 is also rotated together.

  When the sleeve 34 rotates, the cam portion 38 at the rear end of the sleeve 34 moves over the cam inclined portion 58 from the inside of the concave portion 56 of the slide block 52, so that the cam portion 38 is moved to the slide block as shown in FIG. 52 is pushed backward, and thereby the slide block 52 moves backward.

  The rearward movement of the slide block 52 is transmitted to the clutch 62 via the operation projection 60 of the slide block 52, and the clutch 62 also moves rearward against the urging force of the return spring 65. As a result, the engagement convex portion 22 at the rear portion of the rotor 12 is disengaged from the engagement concave portion 64 of the clutch 62, and the connection between the rotor 12 and the clutch 62 is released. As a result, since the output member 28 is rotatably attached to the rear end portion of the rotor 12, the rotation of the rotor 12 is not transmitted to the output member 28, and the rotor 12 and the sleeve 34 are idled.

  As described above, according to the cylinder lock 10 of the present embodiment, the holder 40 is provided with the locking wall 48 that engages with the step portion 20 at the rear portion of the rotor 12 on the rear end side of the holder 40. The rotor 12 is mounted from the front side. As a result, even if a punching attack is performed from the front side of the rotor 12, the rotor 12 does not come out rearward and is unlocked, and the structure is strong against punching and theft prevention is improved.

  Further, since the slide block 52 which is a member different from the sleeve 34 does not rotate even when the sleeve 34 rotates, the operation hole 50 of the locking wall 48 through which the operation convex portion 60 of the slide block 52 passes can be made small. . Therefore, the strength of the locking wall 48 can be maintained, and the anti-theft property is improved.

  The cylinder lock of the present invention is not limited to the above-described embodiment, and various modifications can be made.

  For example, in the cylinder lock 10, the operation convex portion 60 is provided on the slide block 52, but an operation equivalent to the operation convex portion 60 is provided on the clutch 62, and the operation hole 50 of the locking wall 48 is formed in an arc shape. Also good. In this case, the slide block 52 may be formed integrally with the sleeve 34, and a cam portion that moves the sleeve 34 in the front-rear direction may be provided between the sleeve 34 and the front holder 30.

The disassembled perspective view of a cylinder lock. Sectional drawing of a cylinder lock. The front view of a holder. The rear view of a clutch. Sectional drawing of the cylinder lock which shows the state at the time of unauthorized key insertion. Sectional drawing of a cylinder lock which shows a state when rotating a fraudulent key.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Cylinder lock 12 ... Rotor 14 ... Key hole 18 ... Tumbler 20 ... Step part 22 ... Engagement convex part 28 ... Output member 34 ... Sleeve 36 ... Lock groove 38 ... Cam part 40 ... Holder 48 ... Locking wall 50 ... Operation Hole 52 ... Slide block 60 ... Operation convex part 62 ... Clutch 64 ... Engaging concave part 65 ... Return spring

Claims (2)

A rotor in which the tumbler is housed inside by inserting a regular key and is rotatable;
A clutch mechanism for transmitting the rotation of the rotor to an output member on the rotor rear end side and releasing the connection between the rotor and the output member when an unauthorized key is inserted into the rotor and operated;
It has a locking wall on the inner peripheral surface of the rear end side, so as to engage the stepped portion provided at a rear portion of the rotor to the locking wall e Bei a holder for accommodating the rotor,
The clutch mechanism is
A sleeve having a locking groove that is rotatably provided between the rotor and the holder and in which the tumbler provided in the rotor enters and exits;
A slide block that is housed on the front side of the locking wall of the holder and moves in the front-rear direction by rotation of the sleeve;
A clutch that is arranged on the rear side of the locking wall of the holder and that connects or disconnects the rotor and the output member by moving in the front-rear direction;
A cylinder lock characterized in that the movement of the slide block in the front-rear direction is transmitted to the clutch via an operation hole provided through the locking wall . A cam portion for moving the slide block in the front-rear direction is provided at the rear end of the sleeve, and an operation convex portion that penetrates the operation hole and contacts the clutch is provided at the rear end of the slide block. The cylinder lock according to claim 1 .

Images