JPH0321581Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is a cylinder lock used for automobile door locks, etc., and is particularly suitable for use in abnormal situations where the cylinder is forcibly rotated with a key other than a regular key. This invention relates to a cylinder lock that is constructed so as to avoid being destroyed even when the lock is opened.

(Prior art and its problems) Cylinder locks are highly stable among various types of locks, and are widely used as door locks for automobiles and houses. There have been many incidents of theft and malicious harassment caused by inserting a cylinder into a keyhole and forcibly rotating the cylinder to destroy it.

Traditionally, in order to avoid damage from such incidents,
This is merely an attempt to increase the strength of each part so that it will not be easily destroyed even if the cylinder is forcibly rotated with a key other than the official key, but such methods reduce costs and the overall lock. There was a limit due to size.

(Means for Solving the Problems) The present invention proposes a cylinder lock that can solve these conventional problems, and its feature is that it has a locking piece that can be moved in and out with a key. a cylinder provided with the cylinder and rotatably supported by the casing; an intermediate cylindrical body externally fitted on the cylinder and provided with an engagement groove into which the locking piece is fitted; and an intermediate cylindrical body that engages with a transmission section provided on the cylinder. It is loosely fitted in the cylinder so as to be movable in the axial direction between a working position and a non-working position in which it separates rearward from the transmission part and can rotate relative to the cylinder, and comes into contact with the rear end of the intermediate cylindrical body. A locking part opening/closing operating lever, a spring that biases and stabilizes the locking part opening/closing operating lever to the operating position, and a spring that holds the intermediate cylindrical body in a normal position and is connected to the intermediate cylindrical body via the locking piece. an intermediate cylindrical body holding means having a spring and a cam that allows the intermediate cylindrical body to rotate integrally with the cylinder while moving the intermediate cylindrical body rearward when excessive rotational force in the circumferential direction is applied; The locking portion opening/closing operation lever is pressed and moved from an operating position to a non-operating position by moving the shaped body rearward.

(Example) An example of the present invention will be described below based on the attached illustrative drawings.

In Figures 1 to 6, 1 is a cylinder;
2 is a casing, 3 is an intermediate cylindrical body, and 4 is a locking portion opening/closing operation lever. The cylinder 1 is rotatably supported within the casing 2 at its front end large diameter portion 5, and has a plurality of locking pieces 6 at appropriate axial intervals on both sides in the diametrical direction, which can be moved in and out using keys. are arranged in parallel. 7 is a shaft protruding concentrically from the rear end of the cylinder 1,
The lock portion opening/closing operation lever 4 is supported. Reference numeral 8 designates transmission projections protruding from both sides in the diametrical direction at the base of the cylinder shaft portion 7.

The intermediate cylindrical body 3 is externally fitted onto the cylinder 1, and engagement grooves 9 into which the locking pieces 6 are fitted are formed along the axial direction at two locations in the diametrical direction on the inner peripheral surface of the intermediate cylindrical body 3. The rear end surface 3a of this intermediate cylindrical body 3 is located flush with the rear end surface 1a from which the shaft portion 7 and the transmission protrusion 8 of the cylinder 1 are protruded, and there is a circumferential groove for loosely fitting a spring inside the rear end surface 3a. 10 are formed.
Further, the front end of the intermediate cylindrical body 3 is provided with trapezoidal cam follower protrusions 11 projecting at two locations in the diametrical direction, as shown by the broken line in FIG. 2 and in FIG. An annular cam surface 12 is formed with a trapezoidal recess 12a into which the cam follower projection 11 fits. Reference numeral 13 denotes a torsion spring that holds the cylinder 1 in a neutral position with respect to the intermediate cylindrical body 3, and is loosely fitted into the circumferential spring groove 10 of the intermediate cylindrical body 3, and has both ends 13a and 13b.
are notch step surfaces 3b formed on both sides in the diametrical direction of the intermediate cylindrical body 3, and notch step surfaces 1b formed in two diametrical locations on the cylinder 1 so as to be adjacent to both step surfaces 3b. It is bent inward so that it touches the.

The locking part opening/closing operation lever 4 is loosely fitted into the cylinder shaft part 7, and the shaft hole thereof is formed with a driven engagement part 14 into which the transmission protrusion 8 is fitted, as shown in FIG. ing. Reference numeral 15 denotes a stopper protruding from the rear end of the casing 2, which is located in the notch 1 around the locking part opening/closing operating lever 4.
6 to limit the rotation angle of the locking portion opening/closing operation lever 4 to a predetermined angle θ. Reference numeral 17 denotes a dish-shaped spring loosely fitted to the cylinder shaft portion 7 between a snap spring 18 engaged with the cylinder shaft portion 7 and the locking portion opening/closing operation lever 4; The operating position where the driven engagement portion 14 fits with the transmission protrusion 8 and the notch recess 16 fits with the stopper 15 by pressing forward, that is, the rear end surface 1a of the cylinder and the rear of the intermediate cylindrical body. The locking part opening/closing operation lever 4 is held at a position where it comes into contact with the end surface 3a.

The locking part opening/closing operation lever 4 is connected to a locking part (not shown) and an interlocking rod 19, as shown by phantom lines in FIG.
They are interlocked and connected, and are selectively stabilized in the locked position and the unlocked position depending on the configuration on the locking part side.
Further, the driven engagement portion 14 is formed so that even if the locking portion opening/closing operation lever 4 is moved from the locking portion side, the movement thereof is not transmitted to the cylinder 1.

In the cylinder lock configured as described above, when a regular key is inserted into the keyhole of the cylinder 1, all the locking pieces 6 retract and engage the intermediate cylindrical body 3, as is well known in the art. Escape from groove 9 and cylinder 1
The connection between the intermediate cylindrical body 3 and the intermediate cylindrical body 3 is released. In this state, when the cylinder 1 is rotated in the unlocking direction against the biasing force of the torsion spring 13 using the key inserted into the keyhole of the cylinder 1, the lock opening/closing operation lever in the locked position is turned. 4 is rotated by the transmission protrusion 8 of the cylinder 1 toward the unlocked position. When the locking part opening/closing operation lever 4 passes the neutral position between the locked position and the unlocked position, it receives the urging force from the locking part side and rotates to the unlocked position, and one end of the notch recess 16 comes into contact with the stopper 15. Become stable when touching. That is, the locking section is switched to the unlocked state.

When switching from the unlocked state to the locked state, use the key inserted into the keyhole of cylinder 1 to lock cylinder 1.
What is necessary is to rotate the lever in the locking direction, that is, in the opposite direction, and rotate the locking portion opening/closing operation lever 4, which is in the unlocked position, toward the locked position using the transmission protrusion 8. When the locking part opening/closing operation lever 4 exceeds the neutral position between the unlocked position and the locked position, it receives the biasing force from the locking part and rotates to the locked position, and the stopper 15 is rotated as shown in FIG. The other end of the cut-out recess 16 abuts on and becomes stable. That is, the locking section is switched to the unlocked state.

In either case, if the rotational force applied to the key inserted into the keyhole of the cylinder 1 is released, the cylinder 1 will move to the first position due to the biasing force of the torsion spring 13.
As shown in Figures 3 to 3, the rotation returns to the original neutral position and stabilizes.

During the above-mentioned unlocking and locking operations, when the cylinder 1 is rotated, the rotational force also acts on the intermediate cylindrical body 3 via the torsion spring 13. The recess 1 is arranged so that the cam follower protrusion 11 cannot escape from the recess 12a in the annular cam surface 12 on the casing 2 side.
The fitting force of the cam follower protrusion 11 with respect to 2a, that is, the axial pressing force of the dish-shaped spring 17 that the intermediate cylindrical body 3 receives via the locking part opening/closing operation lever 4, and the shapes of the cam follower protrusion 11 and the recess 12a are taken into consideration. are doing.

As described above, if you use a regular key that can simultaneously move all the locking pieces 6 in and out of the cylinder 1, you can open and lock the lock just like a conventional cylinder lock. If you insert an unauthorized tool 20 into the keyhole of the cylinder 1 and try to turn it in the unlocking direction, all the locking pieces 6 will naturally retract. Therefore, the improper rotational force is also transmitted to the intermediate cylindrical body 3 via the locking piece 6 and the engagement groove 9. If this incorrect rotational force exceeds a certain level, the cam follower protrusion 11 of the intermediate cylindrical body 3 will escape from the recess 12a in the annular cam surface 12 on the casing 2 side as shown by the dotted line in FIG. The intermediate cylindrical body 3 rotates together with the cylinder 1 while moving rearward.

As shown in FIGS. 7 and 8, the intermediate cylindrical body 3 is moved rearward by compressing and deforming the dish-shaped spring 17 at the rear end surface 3a via the locking portion opening/closing operating lever 4. The locking part opening/closing operation lever 4 moves backward on the cylinder shaft part 7 against the biasing force of the dish-shaped spring 17, and the driven engagement part 14 disengages from the transmission protrusion 8 on the cylinder 1 side and cuts the periphery. The cutout recess 16 is displaced to a non-operating position where it is separated from the stopper 15 on the casing 2 side.

Therefore, even if the cylinder 1 and the intermediate cylindrical body 3 rotate together, the locking portion opening/closing operation lever 4 is not rotated by the transmission projection 8. In other words, even if the cylinder 1 is forcibly rotated by the unauthorized tool 20, the cylinder 1 simply rotates together with the intermediate cylindrical body 3, and the rotational force is not transmitted to the locking part opening/closing operation lever 4, so that the lock cannot be locked. This section cannot be unlocked illegally.

Incidentally, when the cylinder 1 is continuously rotated in the same direction, the cam follower projection 11 of the intermediate cylindrical body 3 which is rotating integrally therewith again faces the recess 12a in the annular cam surface 12 on the casing 2 side. At this time, the driven engagement portion 1 of the locking portion opening/closing operating lever 4 is held in the locked position by the interlocking rod 19.
4 and the transmission protrusion 8 of the cylinder 1 are in a state where they can be fitted to each other, the intermediate cylindrical body 3 is moved by the biasing force of the dish-shaped spring 17 to the locking part opening/closing operation lever 4
At the same time, the driven engagement portion 14, the transmission protrusion 8, and the peripheral notch recess 16 temporarily return to the front.
and stopper 15 temporarily fit into each other.

A dish-shaped spring 1 serves as a spring that urges the intermediate cylindrical body 3 forward so that the cam follower protrusion 11 fits into the recess 12a of the annular cam surface 12, and presses and stabilizes the locking part opening/closing operating lever 4 to the operating position.
7 is also used, but a spring that urges the intermediate cylindrical body 3 forward may be used separately from the dish-shaped spring 17. Further, as shown in FIG. 9, an annular cam groove 21 is provided on the outer peripheral surface of the intermediate cylindrical body 3, and a protrusion 22 that fits into the cam groove 21 is provided protruding from the casing 2 side. The intermediate cylindrical body 3, which is biased forward, is stabilized at a position where the protrusion 22 fits into the rearward recess 21a formed in the cam groove 21, and the intermediate cylindrical body 3 is prevented from absorbing excessive rotational force. It is also possible to configure the intermediate cylindrical body 3 to be moved a certain distance rearward by the protrusion 22 and the cam groove 21 when the intermediate cylindrical body 3 is rotated.

In addition, in both cases where the cam follower projection 11 and the annular cam surface 12 are used, and when the cam groove 21 and the projection 22 are used, their formation positions with respect to the intermediate cylindrical body 3 and the casing 2 It is also possible to reverse.

(Operations and effects of the invention) As described above, according to the cylinder lock of the invention,
When a regular key is used, all the locking pieces of the cylinder retract and the cylinder becomes rotatable relative to the intermediate cylindrical body. In this case, the locking part opening/closing operating lever located at the operating position where it engages with the transmission protrusion 8) can be rotated in the unlocking direction, but it is impossible to force the cylinder to rotate with unauthorized equipment such as tools or keys that do not match. In this case, the intermediate cylindrical body holding means (in the embodiment, the dish-shaped spring 17, the cam follower protrusion 11, and the recess 12)
(consisting of an annular cam surface 12 with a)
The intermediate cylindrical body rotates together with the cylinder against the holding force of the cylinder, and during this rotation, the intermediate cylindrical body is moved a certain distance rearward by the holding means, and the locking part opening/closing operation lever is moved by the spring. Since the cylinder is pressed and moved from the active position to the non-active position against the biasing force, the engagement between the locking part opening/closing operating lever and the cylinder is released, and the cylinder simply rotates with the intermediate cylindrical body to open/close the locking part. The lever cannot be rotated in the unlocking direction.

In this way, in the cylinder lock of the present invention,
Even if the cylinder is forcibly rotated with an unauthorized tool other than the official key, the lock will not be unlocked, so it can be effectively used as a highly secure cylinder lock, but if the cylinder is forcibly rotated using an unauthorized method If an attempt is made to rotate the cylinder, the cylinder will rotate idly with the locking piece protruding, so the locking piece, etc. will not be destroyed, and simply returning the cylinder to its original rotational position will restore the cylinder to its normal state. Since it can be reused as a lock, the economic effect is enormous.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal side view, Fig. 2 is a transverse plan view, Fig. 3 is a sectional view taken along line A-A in Fig. 1, Fig. 4 is a longitudinal rear view showing the annular cam surface of the casing, and Fig. 5 is a longitudinal sectional view. A front view showing the cam driven protrusion of the intermediate cylindrical body, Fig. 6 is a vertical cross-sectional rear view showing the state of engagement between the locking part opening/closing operating lever and the cylinder shaft, and Fig. 7 shows the intermediate cylindrical body moved rearward. FIG. 8 is a cross-sectional side view showing the state, FIG. 8 is a cross-sectional plan view of the same, and FIG. 9 is a cross-sectional plan view showing a modified example. 1...Cylinder, 2...Casing, 3...
Intermediate cylindrical body, 4...Lock opening/closing operation lever, 6...
... Retractable locking piece, 7... Cylinder shaft, 8
... Transmission projection, 9 ... Engagement groove, 11 ... Cam driven projection, 12 ... Annular cam surface, 12a ... Recessed part,
13...Torsion spring, 14...Driven engagement part, 15...Stopper, 16...Peripheral notch recess, 17...Dish-shaped spring, 19...Interlocking rod with locking part, 20...Illegal Tools.

Claims (1)

[Scope of utility model registration request] A cylinder equipped with a locking piece that can be moved in and out with a key and rotatably supported by a casing, and an intermediate cylindrical body that is fitted onto the outside of the cylinder and equipped with an engagement groove into which the locking piece fits. , the cylinder is fitted loosely so as to be movable in the cylinder axial direction between an operating position in which it engages with a transmission part provided on the cylinder and a non-operation position in which it separates rearward from the transmission part and can rotate relative to the cylinder; A locking part opening/closing operating lever that contacts the rear end of the intermediate cylindrical body, a spring that biases and stabilizes the locking part opening/closing operating lever in the operating position, and a spring that holds the intermediate cylindrical body in its normal position and It has a spring and a cam that allow the intermediate cylindrical body to move rearward and rotate integrally with the cylinder when excessive rotational force in the circumferential direction is applied to the intermediate cylindrical body via the locking piece. A cylinder lock comprising an intermediate cylindrical body holding means, wherein the locking portion opening/closing operation lever is pressed and moved from an operating position to a non-operating position by moving the intermediate cylindrical body rearward.