GB2029893A - Anti-theft lock - Google Patents
Anti-theft lock Download PDFInfo
- Publication number
- GB2029893A GB2029893A GB7930047A GB7930047A GB2029893A GB 2029893 A GB2029893 A GB 2029893A GB 7930047 A GB7930047 A GB 7930047A GB 7930047 A GB7930047 A GB 7930047A GB 2029893 A GB2029893 A GB 2029893A
- Authority
- GB
- United Kingdom
- Prior art keywords
- barrel
- plate member
- lock
- bolt member
- lever
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
- B60R25/01—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens
- B60R25/02—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens operating on the steering mechanism
- B60R25/021—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens operating on the steering mechanism restraining movement of the steering column or steering wheel hub, e.g. restraining means controlled by ignition switch
- B60R25/0211—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens operating on the steering mechanism restraining movement of the steering column or steering wheel hub, e.g. restraining means controlled by ignition switch comprising a locking member radially and linearly moved towards the steering column
- B60R25/02115—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens operating on the steering mechanism restraining movement of the steering column or steering wheel hub, e.g. restraining means controlled by ignition switch comprising a locking member radially and linearly moved towards the steering column key actuated
- B60R25/02118—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens operating on the steering mechanism restraining movement of the steering column or steering wheel hub, e.g. restraining means controlled by ignition switch comprising a locking member radially and linearly moved towards the steering column key actuated with linear bolt motion parallel to the lock axis
- B60R25/02121—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens operating on the steering mechanism restraining movement of the steering column or steering wheel hub, e.g. restraining means controlled by ignition switch comprising a locking member radially and linearly moved towards the steering column key actuated with linear bolt motion parallel to the lock axis comprising safety devices avoiding locking until removal of the key
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lock And Its Accessories (AREA)
Abstract
An anti-theft lock, primarily to lock the steering column of a motor vehicle, has a key-operated barrel (4) and, in-line with said barrel, a locking bolt (8) which is retracted on rotation of the barrel. An electric switch (26), preferably the ignition switch of a motor vehicle, is mounted externally of the casing. The lock further includes a key-hole plate (18) which is rotatable with the barrel to effect actuation of the ignition switch 24 and which, on initial insertion of the key into the lock, slides laterally to a bolt-retaining lever (32) into action until the key is totally withdrawn. <IMAGE>
Description
SPECIFICATION
Improvements in or relating to anti-theft locks
This invention relates to anti-theft locks and has particular, though not exclusive, application to such locks for mounting on automobiles and other vehicles to render inoperative a normally movable mechanism, such as the steering, whereby the vehicle cannot be driven.
It is established practice to provide antitheft locks for vehicles, which locks, known as cartridge locks, include a key-operated barrel and a bolt-member in line with said barrel.
Such locks further include, in the interior thereof, means which, on operation of the lock to render movable said mechanism, can actuate the ignition switch of the vehicle. The construction of such established locks is such that access to the ignition switch can only be achieved through removal from the vehicle of the lock mechanism.
New security regulations propose that, in certain circumstances, the ignition switch of a vehicle must be serviceable without the necessity for first removing the lock mechanism, and clearly the above-mentioned established arrangements do not meet these requirements.
According to the present invention there is provided an anti-theft lock comprising a casing containing a rotatable lock barrel having a keyway therethrough in one end of which can be received a key, a bolt member resiliently biased towards an operative position engaging with, to prevent movement of, movable means to be locked, said bolt member being movable, against said resilient bias on rotation of the barrel, from said operative position to a retracted position disengaged from, to permit movement of, said movable means, and switch means located externally of the casing, the lock further comprising a plate member mounted on the casing at or adjacent the one end of the barrel to extend transverely of said barrel, said plate-member containing a slot therethrough and being resiliently biased into a rest position on the casing with the slot misaligned with the keyway through the barrel, and holding means reacting between the plate member and the bolt member, the arrangement being such that, on initial insertion of the key through the slot in the plate member and into the keyway in the barrel in its rest position, the plate member is moved transversely of the barrel from its rest position, against its resilient bias, to a displaced position in which the slot therein is aligned with said keyway, said movement of the plate member displacing the holding means from a rest position to a holding position, subsequent rotation of the key rotating both the barrel and the plate member, said rotation of the barrel withdrawing the bolt member, against its resilient bias, from its operative position to its retracted position, and said rotation of the plate member actuating said switch means, the bolt member being retained in its retracted position by the holding means until the barrel is returned to its rest position and the key is completely withdrawn from the barrel and the plate member, said withdrawal permitting the plate member to return under its resilient bias to its rest position thereby releasing the holding means from the bolt member and permitting said bolt member to return under its resilient bias to its operative position.
Preferably movement of the bolt member between its operative position and its retracted position is along a line forming a continuation of the central axis of the barrel.
Movement of the bolt member from its operative position to its retracted position on initial rotation of the barrel from its rest position may be effected through co-operation between a cam surface on one of the barrel or bolt member and a roller on the other of said barrel or bolt member.
Conveniently the cam surface is part of the bounding surface of an aperture formed through a tubular extension to the other end of the barrel, and the co-operating roller is rotatable on a pin member projecting from the bolt member.
In a preferred lock the holding means includes a lever mounted externally on the casing and extending substantially parallel with the barrel to be pivotal about a fixed intermediate axis on the casing extending transversely of the barrel, one end of said lever being received within an arcuate slot in the plate member and an aperture being formed through the lever adjacent the other end thereof, the holding means further including a plunger mounted on, to be movable with, the bolt member said plunger being resiliently biased to a rest position projecting, radially of the barrel, from the casing, the arrangement being such that, with the plate member in its rest position, the other end of the lever is located over, to be disengaged from the plunger, insertion of the key through said plate member and into the barrel keyway pivoting the lever to bring the other end thereof into a holding position in which said end of the lever engages with, to depress against its resilient bias, the plunger, axial movement of the bolt member, on rotation of the barrel, from its operative position to its retracted position bringing the plunger into alignment with the aperture in the lever whereby said plunger, under the influence of its resilient bias, springs into said aperture to remain therein until the key is totally withdrawn from the plate member, return of the plate member to its rest position on said withdrawal of the key pivoting the lever to disengage said lever from the plunger and permit the bolt member to return, under its resilient bias, to its operative position.
The plate member may include an abutment member extending perpendicularly therefrom parallel with the central axis of the barrel, said abutment member being received within the switch means such that, on rotation of the plate means and barrel to predetermined displaced positions, said switch means is actuated by said abutment member.
By way of example only, an embodiment of the invention will now be described in greater detail with reference to Figs. 1 and 2 of the accompanying drawings which are, respectively, part-longitudinal sections through a lock according to the invention with the key about to enter the lock barrel and the key about to be withdrawn from the lock barrel.
Referring to the drawings, the illustrated lock comprises a casing 2 provided, adjacent the front thereof, with a cylindrical bore in which is received a lock barrel 4. The shaft 6 of a key can be inserted into one end of the barrel whereby said barrel is rotatable from a rest position to a fully displaced position in the casing.
The rear of the casing houses therein an elongate bolt member 8 of rectangular transverse section, the axis of said member 8 forming a continuation of the central axis of, to be in-line with, the barrel 4. Said bolt member, as will be detailed below, is movable between an operative position shown in Fig. 1 in which an end portion thereof projects from the casing 2 through a rectangular aperture 10 in an end wall 1 2 thereof to engage with, and render immobile, a normally-movable mechanism, and a retracted position shown in
Fig. 2 in which the bolt member is totally received within the casing 2 and is disengaged from, to render movable, said mechanism.
Said movement of the bolt member 8 is achieved by co-operation between means on the member 8 and barrel 4 during said initial rotation of the barrel. More particularly, the barrel is provided with a rearwardly extending tubular extension 14 which embraces the foremost extent of the bolt member. An aperture (not shown) is formed in said tubular extension 14, a bounding surface of said aperture providing a cam surface extending at an angle to the circumference of the barrel and to the central axis of the barrel.
The end of the bolt member 8 adjacent the barrel 4 carries a spring-loaded pin member (not shown) which extends through the aperture in the extension 1 4 and carries a roller (not shown) which engages said cam surface of the aperture.
Thus it will be appreciated that, as the barrel 4, tubular extension 14 and cam surface are rotated, the co-operation between the roller and the cam surface is such as to draw the bolt member 8 axially towards the barrel 4 against the resilient bias of a coil spring 1 6 reacting between the two components. During said rotation of the barrel 4 and axial movement of the bolt member 8, the roller rolls along the cam surface reducing frictional wear that would otherwise occur if a sliding, as opposed to rotary, arrangement were provided.
Mounted on the casing 2 over the front end of the barrel 4 is a plate member indicated generally at 18 and including a main body portion 20 extending transversely of said barrel. The plate member further includes an abutment portion 22 extending perpendicularly from an end of the body portion to lie parallel with the axis of the barrel 4. Said abutment portion 22 is received within the housing 24 of an electric switch indicated generally at 26, the plate member 18 being resiliently urged to a rest position shown in
Fig. 1 by a coil spring 27 reacting between the abutment portion 22 and the barrel 4, said spring extending through a part-circumferential aperture in the casing 2 to enable engagement with the barrel. In this position of the plate member 18, a slot 28 in said member is misaligned with, to be located just below, the keyway through the barrel 4.
The end of the body portion 20 of the plate member 1 8 remote from the abutment portion 22 has an arcuate slot 30 formed therein which, on operation of the lock, controls the actuation of holding means for the bolt member 8.
More particularly, said holding means include a lever indicated generally at 32 pivotal about an axle 34 intermediate the length of the lever and fixed on the casing 2. When the plate member 1 8 is in the rest position shown in Fig. 1, one end 36 of the lever 32 is received within the arcuate slot 30 in the body portion 20 of the plate member 18, while the other end 38 of the lever 32 is in an uppermost position above the tubular extension 14 of the barrel. An aperture 40 is formed through the lever 32 at a position adjacent said end 38 of the lever for reasons to be detailed below.
The holding means further include a plunger 42 mounted in, to be movable with, the bolt member 8 and resiliently urged by a coil spring 44 to project radially from the bolt member through an arcuate slot 46 in the tubular extension 14 to a position external of the casing 2 as seen in Fig. 1. With the lock in the condition shown in Fig. 1, the outer end of the plunger 42 is located below and out of contact with the end 38 of the lever 32.
The above-detailed lock operates as follows.
With the lock in the rest condition shown in
Fig. 1, the bolt member 8 is urged by the coil spring 1 6 into its operative position projecting from the casing 2. On insertion of the shaft 6 of the key through the slot 28 in the plate member 1 8 and into the keyway through the barrel 4, said plate member is moved bodily upwards by the key, against the bias of the coil spring 27, to bring the slot 28 into alignment with said keyway. An inclined ramp 46 within the front end of the barrel 4 leads up to the keyway through said barrel and is engaged by the leading end of the shaft 6 after insertion of said shaft through the slot 28. Said ramp serves to guide the shaft 6 of the key into the keyway while at the same time the movement of the shaft into the keyway raises the plate member 1 8.
On said raising of the plate member 18, the lever 32 is pivoted from the position shown in
Fig. 1 to that shown in Fig. 2, the end 38 of said lever moving into engagement with the projecting end of the plunger 42 and depressing said plunger slightly against the bias of the spring 44.
On rotation of the key, the barrel 4 and the plate member 1 8 are rotated therewith. As detailed above, rotation of the barrel draws the bolt member 8 from its operative position into its retracted position, during which movement the outer end of the plunger 42 slides along the undersurface of the end 38 of the lever 32. When the bolt member 8 reaches its retracted position, the plunger 42 is aligned with the aperture 40 in the lever 32 and springs up into said aperture under the influence of the spring 44. Thus, regardless of the subsequent rotary position of the barrel 4, the bolt member 8 will be held in its retracted position until the lever 32 is pivoted out of engagement with the plunger 42.
Rotation of the plate member 1 8 with the barrel 4 and relative to the casing 2 and switch 26 mounted thereon brings the abutment portion 22 of said member 1 8 into operative engagement with the contacts of said switch to effect actuation of the switch.
Reverse rotation of the key returns the barrel 4 and plate member 1 8 to their angular rest positions, the bolt member 8 remaining in its retracted position due to the co-operation between the plunger 42 and the lever 32.
On withdrawal of the key from the barrel and from the slot 28 through the plate member 18, the plate member is released from its displaced position to be returned under the bias of the spring 27 to its rest position. The one end 36 of the lever 32 is thus drawn down with the plate member to pivot the lever back to the position shown in Fig. 1. The plunger 42 is thus released from the lever 32 and the bolt member 8 is urged by the spring 1 6 to its operative position.
The preferred application of the above-detailed arrangement is as a steering column lock/ignition switch for a motor vehicle, the bolt member 8, in the operative position thereof, locking the steering against movement and the switch 26 comprising the electrical ignition switch of the vehicle.
It will be appreciated that the provision of the ignition switch 26 outside the casing 2 instead of within said casing and in the lock mechanism, as is established practice, greatly improves the accessibility of the switch which is thus readily serviceable without removing the lock mechanism from the casing and in accordance with the proposed new requirements. Further, the only component between the shaft 6 of the key and the actuating contacts of the switch 26 is the relatively rigid plate member 1 8 thus providing a positive drive to said switch. This can be compared with established cartridge locks in which the drive from the key to the ignition switch is by way of several interconnected components.
Further, the described arrangement retains the advantage of established cartridge locks in that the bolt member 8 works in-line with the barrel 4, providing an economic and compact device, and has the added advantage of retaining the bolt member in the retracted position until the key is totally withdrawn from the lock.
Claims (8)
1. An anti-theft lock comprising a casing containing a rotatable lock barrel having a keyway therethrough in one end of which can be received a key, a bolt member resiliently biased towards an operative position engaging with, to prevent movement of, movable means to be locked, said bolt member being movable, against said resilient bias on rotation of the barrel, from said operative position to a retracted position disengaged from, to permit movement of, said movable means, and switch means located externally of the casing, the lock further comprising a plate member mounted on the casing at or adjacent the one end of the barrel to extend transversely of said barrel, said plate member containing a slot therethrough and being resiliently biased into a rest position on the casing with the slot misaligned with the keyway through the barrel, and holding means reacting between the plate member and the bolt member, the arrangement being such that, on initial insertion of the key through the slot in the plate member and into the keyway in the barrel in its rest position, the plate member is moved transversely of the barrel from its rest position, against its resilient bias, to a displaced position in which the slot therein is aligned with said keyway, said movement of the plate member displacing the holding means from a rest position to a holding position, subsequent rotation of the key rotating both the barrel and the plate member, said rotation of the barrel withdrawing the bolt member, against its resilient bias, from its operative position to its retracted position, and said rotation of the plate member actuating said switch means, the bolt member being retained in its re tracted position by the holding means until the barrel is returned to its rest position and the key is completely withdrawn from the barrel and the plate member, said withdrawal permitting the plate member to return under its resilient bias to its rest position thereby releasing the holding means from the bolt member and permitting said bolt member to return under its resilient bias to its operative position.
2. A lock as claimed in claim 1 in which movement of the bolt member between its operative position and its retracted position is along a line forming a continuation of the central axis of the barrel.
3. A lock as claimed in claim 1 or claim 2 in which movement of the bolt member from its operative position to its retracted position on initial rotation of the barrel from its rest position is effected through co-operation between a cam surface on one of the barrel or bolt member and a roller on the other of said barrel or bolt member.
4. A lock as claimed in claim 3 in which the cam surface is part of the bounding surface of an aperture formed through a tubular extension to the other end of the barrel, and the co-operating roller is rotatable on a pin member projecting from the bolt member.
5. A lock as claimed in any one of claims 1 to 4 in which the holding means includes a lever mounted externally on the casing and extending substantially parallel with the barrel to be pivotal about a fixed intermediate axis on the casing extending transversely of the barrel, one end of said lever being received within an arcuate slot in the plate member and an aperture being formed through the lever adjacent the other end thereof, the holding means further including a plunger mounted on, to be movable with, the bolt member, said plunger being resiliently biased to a rest position projecting, radially of the barrel, from the casing, the arrangement being such that, with the plate member in its rest position, the other end of the lever is located over, to be disengaged from, the plunger, insertion of the key through said plate member and into the barrel keyway pivoting the lever to bring the other end thereof into a holding position in which said end of the lever engages with, to depress against its resilient bias, the plunger, axial movement of the bolt member, on rotation of the barrel, from its operative position to its retracted position bringing the plunger into alignment with the aperture in the lever whereby said plunger, under the influence of its resilient bias, springs into said aperture to remain therein until the key is totally withdrawn fron the plate member, return of the plate member to its rest position on said withdrawal of the key pivoting the lever to disengaged said lever from the plunger and permit the bolt member to return, under its resilient bias, to its operative position.
6. A lock as claimed in any one of claims 1 to 5 in which the plate member includes an abutment member extending perpendicularly therefrom parallel with the central axis of the barrel, said abutment member being received within the switch means such that on rotation of the plate means and barrel to predetermined displaced positions, said switch means is actuated by said abutment member.
7. A lock as claimed in any one of claims 1 to 6 in which the movable means is the steering column of an automobile and the switch means is the ignition switch of said automobile.
8. An anti-theft lock substantially as described with reference to and as illustrated by the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7930047A GB2029893B (en) | 1978-08-31 | 1979-08-30 | Anti theft lock |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7835095 | 1978-08-31 | ||
| GB7930047A GB2029893B (en) | 1978-08-31 | 1979-08-30 | Anti theft lock |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2029893A true GB2029893A (en) | 1980-03-26 |
| GB2029893B GB2029893B (en) | 1982-05-12 |
Family
ID=26268706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7930047A Expired GB2029893B (en) | 1978-08-31 | 1979-08-30 | Anti theft lock |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2029893B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0335712A2 (en) * | 1988-03-31 | 1989-10-04 | Alpha Corporation | A steering column shaft locking device for an automotive vehicle |
| EP0628455A1 (en) * | 1993-06-09 | 1994-12-14 | Valeo Securite Habitacle | Steering lock for motor vehicle |
-
1979
- 1979-08-30 GB GB7930047A patent/GB2029893B/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0335712A2 (en) * | 1988-03-31 | 1989-10-04 | Alpha Corporation | A steering column shaft locking device for an automotive vehicle |
| EP0335712A3 (en) * | 1988-03-31 | 1989-12-27 | Kokusan Kinzoku Kogyo Kabushiki Kaisha | A steering column shaft locking device for an automotive vehicle |
| EP0628455A1 (en) * | 1993-06-09 | 1994-12-14 | Valeo Securite Habitacle | Steering lock for motor vehicle |
| FR2706392A1 (en) * | 1993-06-09 | 1994-12-23 | Valeo Securite Habitacle | Steering lock for motor vehicle. |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2029893B (en) | 1982-05-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |