JPH0332215Y2 - - 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) Among various types of locks, cylinder locks are highly safe 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 simply 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, and this method reduces 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. an intermediate cylindrical body that is rotatable relative to the casing and movable in the axial direction, and that rotates integrally with the cylinder when a regular key is not fitted to the cylinder; The intermediate member is loosely fitted in the cylinder so as to be movable in the axial direction between an operating position where it engages with a transmission part provided on the cylinder and a non-operation position where it is disengaged 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 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 When an excessive rotational force in the circumferential direction is applied to the body via the locking piece, the intermediate cylindrical body is moved rearward and allowed to rotate integrally with the cylinder;
An intermediate cylindrical body holding means having a spring and a cam is provided, and when the intermediate cylindrical body moves rearward, the locking portion opening/closing operation lever is pressed and moved from an operating position to a non-operating position. .

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

In FIGS. 1 to 6, 1 is a cylinder of a wafer-type cylinder lock, 2 is a casing, 3 is an intermediate cylindrical body, and 4 is a locking part opening/closing operating lever.
The cylinder 1 is rotatably supported in 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. Reference numeral 7 denotes a shaft portion concentrically protruding from the rear end of the cylinder 1, and supports the locking portion opening/closing operation lever 4. 8 is the cylinder shaft portion 7
This is a transmission protrusion that protrudes from both sides in the diametrical direction at the base of the transmission.

The intermediate cylindrical body 3 is externally fitted onto the cylinder 1, and engagement grooves 9a into which the locking pieces 6 fit are formed along the axial direction at two locations in the diametrical direction on the inner peripheral surface of the intermediate cylindrical body 3, Furthermore, an engagement groove 9a is provided at the rear end of the inner peripheral surface.
An annular groove 9b having a depth comparable to that of the engagement groove 9a is formed around the entire circumference of the annular groove 9b and communicates with the engagement groove 9a. Rear end surface 3a of this intermediate cylindrical body 3
are the shaft portion 7 of the cylinder 1 and the transmission protrusion 8
is located flush with the rear end surface 1a from which it is protruded. Further, on the rear end of the cylinder 1, engagement protrusions 10 are protruded on both sides of the outer peripheral surface in the diametrical direction at positions aligned with the locking pieces 6.
is normally located within the annular groove 9b of the intermediate cylindrical body 3 and is not engaged with the intermediate cylindrical body 3. Furthermore, the front end of this intermediate cylindrical body 3 is marked with a broken line in FIG.
As shown in the figure, trapezoidal cam driven protrusions 11 are protruded at two locations in the diametrical direction, and the casing 2
An annular cam surface 12 having a trapezoidal recess 12a into which the cam follower protrusion 11 fits is formed inside. 13 is a cylinder positioning means;
The ball 13a is held by a spring 13c so as to be able to protrude from the inner end of a radial hole 13b provided in the casing 2, and is inserted into the engagement recess 13d (located on both sides in the diametrical direction) on the outer peripheral surface of the cylinder 1 at the neutral position of the cylinder 1. engagement, thereby determining the neutral position of the cylinder 1.

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 a notch 16 in the periphery of the locking portion opening/closing operation lever 4.
The rotation angle of the locking portion opening/closing operation lever 4 is limited to a predetermined angle θ. Reference numeral 17 indicates the cylinder shaft portion 7 between the snap spring 18 engaged with the cylinder shaft portion 7 and the locking portion opening/closing operation lever 4.
A dish-shaped spring loosely fitted in the locking portion opening/closing operation lever 4 is pressed forward,
The driven engagement portion 14 fits into the transmission protrusion 8 and the cutout recess 16 fits into the stopper 15 at the operating position, that is, the position where it abuts against the rear end surface 1a of the cylinder and the rear end surface 3a of the intermediate cylindrical body. Holds the locking part opening/closing operation lever 4.

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. It escapes from the groove 9a, and the connection between the cylinder 1 and the intermediate cylindrical body 3 is released. At this time, the engagement protrusion 10 of the cylinder 1 is located within the annular groove 9b. In this state, when the cylinder 1 is rotated in the unlocking direction using the key inserted into the keyhole of the cylinder 1, the transmission protrusion 8 of the cylinder 1 moves the lock opening/closing lever 4 in the locked position. Rotate it towards 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. After unlocking, the key is inserted into the keyhole and rotated in the opposite direction, and the ball 13a of the cylinder positioning means 13 engages with the engagement recess 13d to set it at the neutral position, and then the lock is pulled. All you have to do is pull it out.

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 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 locked state. Even after this locking, the cylinder 1 is rotated and returned to its original neutral position as shown in FIGS. 1 to 3 by rotating the key inserted into the keyhole of the cylinder 1 and stabilized. let

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 incorrect rotational force is also transmitted to the intermediate cylindrical body 3 via the locking piece 6 and the engagement groove 9a. 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 the rear end surface 3a compressing and deforming the dish-shaped spring 17 via the locking part opening/closing operation 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. The unit will not be unlocked illegally. In this case, the spring pressure of the dish-shaped spring 17 is considerably strong, and the rear end surface 3a of the intermediate cylindrical body 3 relative to the locking portion opening/closing operating lever 4
If the contact area is large, the frictional force generated between the rear end surface of this intermediate cylindrical body and the locking part opening/closing operating lever 4 becomes large, and the locking part opening/closing operating lever 4 rotates freely together with the cylinder 1. It may rotate together with the intermediate cylindrical body 3. Therefore, a dish-shaped spring 17 with relatively low spring pressure is used, and the rear end surface 3a of the intermediate cylindrical body 3 that contacts the locking part opening/closing operation lever 4 is rounded and chamfered, for example. It is necessary to prevent frictional force from occurring between the control lever 4 and the operating lever 4 as much as possible.
In addition, since a certain amount of load (resistance) is always applied to the locking part opening/closing operating lever 4 by the interlocking rod 19 and the locking part connected thereto, the operating lever 4 and the rear end surface of the intermediate cylindrical body are Even if some frictional force is generated between it and 3a, it will not rotate easily.

Further, as the intermediate cylindrical body 3 moves rearward, the engaging protrusion 10 on the cylinder 1 comes to be thrust into the engaging groove 9a of the intermediate cylindrical body 3 as shown in FIG. ing. Therefore, for example, if the cylinder 1 is rotated together with the intermediate cylindrical body 3 by someone malicious, and the cylinder 1 is left in a position that is out of the neutral position, the keyhole will not fit properly. Even if the key is inserted and each locking piece 6 is retracted and turned, the intermediate cylindrical body 3 moves backward as shown in Fig. 7 and remains in the non-operating position, so the cylinder Only the key 1 rotates in this non-operating position and therefore cannot be unlocked, but in such a case, the engaging protrusion 10 is engaged with the engaging groove 9a as shown in FIG. By the rotation operation, the intermediate cylindrical body 3 is also rotated together with the cylinder 1, so that the intermediate cylindrical lock body 3 returns to its original position as shown in FIG. The cylinder 1 is positioned at a neutral position via cylinder positioning means 13.

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 portion 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.

The cylinder locks of the embodiments described above with reference to FIGS. 1 to 8 are so-called wafer-type cylinder locks, but the present invention is not limited to this type, and can also be applied to so-called pin-type cylinder locks. An example of this pin-type cylinder lock is shown in FIG. Components similar to those of the cylinder lock shown in FIGS. 1 to 8 are designated by the same numbers. That is, according to FIG. 9, the cylindrical member 21 is fitted onto the cylinder 1,
This cylindrical member 21 has a plurality of pin tumblers 22 of different lengths, each consisting of a pin 22a and a driver 22b, each having a spring 22c.
Normally, the driver 22b of each pin tumbler 22 is interposed between the cylindrical member 21 and the cylinder 1, so that the cylindrical member 21 and the cylinder 1 are connected and rotate together. Then, when a regular key is inserted into the keyhole of the cylinder 1 and fitted, the end surface of the pin 22a of each pin tumbler 22 becomes flush with the outer peripheral surface of the cylinder 1, and the cylinder 1 and the cylindrical member 21 are opposed to each other. It becomes possible to rotate. Further, a guide piece 23 is provided protruding from the rear end of the cylindrical member 21, and this guide piece 23 is connected to an engagement groove 23 extending in the axial direction provided on the inner peripheral surface of the rear end of the intermediate cylindrical body 3. is constantly engaged. Furthermore, an engagement protrusion 10 is provided protruding from the rear end of the cylinder 1.
is normally located in an annular groove 25 formed on the inner peripheral surface of the rear end of the intermediate cylindrical body 3 over the entire circumference behind the engagement groove 24, and is not engaged with the intermediate cylindrical body 3. When the intermediate cylindrical body 3 moves rearward, it engages in the engagement groove 24, causing the cylinder 1 and the intermediate cylindrical body 3 to rotate together. This intermediate cylindrical body 3 is rotatably fitted into the casing 2, and trapezoidal cam follower protrusions 11 are protruded from the front end of the intermediate cylindrical body 3 at two locations in the diametrical direction. Although not shown inside, there is a cam follower protrusion 1.
An annular cam surface is formed which has a trapezoidal recess into which 1 is fitted. The rest of the structure is the same as in the previous embodiment.

In this pin-type cylinder lock, when you insert the regular key into the keyhole of cylinder 1 and make it fit,
The coupling between the cylinder 1 and the cylindrical member 21 is released, and the unlocking operation becomes possible. When an unauthorized tool is inserted into the keyhole of the cylinder 1 and an attempt is made to rotate it in the unlocking direction, the unauthorized rotational force is transferred to the cylindrical member 21.
The information is transmitted to the intermediate cylindrical body 3 via the guide piece 23, and as a result, the intermediate cylindrical body 3 rotates together with the cylinder 1 while moving rearward, and the locking portion is opened as in the previous embodiment. Never locked. Further, as the intermediate cylindrical body 3 moves rearward, the engagement protrusion 10 on the cylinder 1 enters into engagement with the engagement groove 24 . Therefore, if the cylinder 1 is left in a position away from the neutral position, even if a regular key is inserted into the keyhole and turned, the intermediate cylindrical body 3 will remain in the non-operating position. Because there is cylinder 1
The key rotates in this non-operating position and therefore cannot be unlocked, but since the engaging protrusion 10 is engaged with the engaging groove 24 as described above, the intermediate cylindrical body 3 is also rotated by the rotating operation of the key. The intermediate cylindrical body 3 rotates together with the cylinder 1, thereby returning the intermediate cylindrical body 3 to its original position.

(Operations and effects of the invention) As described above, according to the cylinder lock of the invention,
When a regular lock is used, the cylinder is rotatable relative to the intermediate cylindrical body, so the key rotates the cylinder and engages with the transmission part of the cylinder (transmission protrusion 8 in the embodiment). The locking part opening/closing operation lever in the position can be rotated in the unlocking direction, but if an attempt is made to forcibly rotate the cylinder with unauthorized equipment such as tools or an incompatible key, the intermediate cylindrical body holding means ( In the embodiment, a dish-shaped spring 17, a cam follower protrusion 11,
and an annular cam surface 12 having a recess 12a), the intermediate cylindrical body rotates together with the cylinder, and during this rotation, the intermediate cylindrical body is held by the holding means. The locking part opening/closing operating lever is moved backward by a certain distance and is pressed and moved from the active position to the non-working position against the biasing force of the spring, so that the engagement between the locking part opening/closing operating lever and the cylinder is released; The cylinder simply rotates with the intermediate cylindrical body, and the locking part opening/closing operation 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 do so, the cylinder will rotate idly with the locking piece (wafer type) and pin tumbler (pin type) protruding, so the locking piece etc. will not be destroyed. The economic effect is enormous because the cylinder can be reused as a normal cylinder lock simply by returning it to its original rotational position.

[Brief explanation of drawings]

FIG. 1 is a vertical side view showing an embodiment of the present invention;
Fig. 2 is a cross-sectional plan view, Fig. 3 is a cross-sectional view taken along the line A-A in Fig. 1, Fig. 4 is a vertical cross-sectional rear view showing the annular cam surface of the casing, and Fig. 5 is a cam follower protrusion of the intermediate cylindrical body. 6 is a longitudinal cross-sectional rear view showing the state of engagement between the locking part opening/closing operation lever and the cylinder shaft part,
FIG. 7 is a longitudinal sectional side view showing a state in which the intermediate cylindrical body has moved rearward, FIG. 8 is a lateral plan view thereof, and FIG. 9 is a longitudinal sectional side view showing another embodiment of the present invention. 1...Cylinder, 2...Casing, 3...
Intermediate cylindrical body, 4...Lock opening/closing operation lever, 6...
... Retractable locking piece, 7... Cylinder shaft, 8
... Transmission projection, 9a ... Engagement groove, 10 ... Engagement projection, 11 ... Cam driven projection, 12 ... Annular cam surface, 12a ... Recess, 13 ... Cylinder positioning means, 14 ... Driven 15...Stopper, 16...Peripheral notch recess, 17...Dish-shaped spring, 19...Interlocking rod with locking part, 2
0... Illegal tool, 21... Cylindrical member, 22... Pin tumbler, 23... Guide piece.

Claims (1)

[Scope of utility model registration request] The cylinder is disposed between a casing and a cylinder provided with a locking piece that is retracted and retracted by a key, and is rotatable and axially movable relative to the casing, and is normally movable with respect to the cylinder. An intermediate cylindrical body that can rotate integrally when the key is not engaged, and an active position where it engages with a transmission part provided on the cylinder, and a position where it separates from the transmission part rearward and rotates relative to the cylinder. a locking part opening/closing operating lever that is loosely fitted in a cylinder so as to be movable in the axial direction of the cylinder between a non-operating position and abutting the rear end of the intermediate cylindrical body; and a spring that holds the intermediate cylindrical body in a normal position and moves the intermediate cylindrical body backward when excessive rotational force in the circumferential direction is applied to the intermediate cylindrical body through the locking piece. An intermediate cylindrical body holding means having a spring and a cam is provided to allow the intermediate cylindrical body to rotate integrally with the cylinder in a moved state, and when the intermediate cylindrical body moves rearward, the locking portion opening/closing operating lever is brought into the operating position. A cylinder lock that can be pressed and moved from the position to the non-operating position.