GB1595062A - Vehicle anti-theft device - Google Patents

Vehicle anti-theft device Download PDF

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Publication number
GB1595062A
GB1595062A GB5091876A GB5091876A GB1595062A GB 1595062 A GB1595062 A GB 1595062A GB 5091876 A GB5091876 A GB 5091876A GB 5091876 A GB5091876 A GB 5091876A GB 1595062 A GB1595062 A GB 1595062A
Authority
GB
United Kingdom
Prior art keywords
barrel
cam
rotor
driving member
shaft
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.)
Expired
Application number
GB5091876A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Willenhall Ltd L & F
Original Assignee
Willenhall Ltd L & F
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Willenhall Ltd L & F filed Critical Willenhall Ltd L & F
Priority to GB5091876A priority Critical patent/GB1595062A/en
Publication of GB1595062A publication Critical patent/GB1595062A/en
Expired legal-status Critical Current

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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
    • B60R25/02126—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 perpendicular to the lock axis
    • B60R25/02128—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 perpendicular to the lock axis comprising safety devices avoiding locking until removal of the key

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lock And Its Accessories (AREA)

Description

(54) VEHICLE ANTI-THEFT DEVICE (71) We, L & F WILLENHALL LIMITED, a British Company of Church Street, Willenhall, West Midlands, do hereby declare the invention for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to a vehicle antitheft device of the kind, hereinafter called the kind specified, comprising a body having switch-receiving means adapted to receive an electrical switch, a barrel mounted in the body at a position spaced from the switch receiving means, the barrel having a keyreceiving slot into which a key can be inserted to free the barrel for rotation relative to the body about an axis, a bolt lying generally in a region between the barrel and the switch receiving means, the bolt being movable relative to the body between a locking position in which it is adapted to engage a movable control member of the vehicle and a releasing position in which it does not so engage the control member of the vehicle, a cam which is rotatable about said axis by rotation of the barrel to displace the bolt between its locking and its releasing positions and a rotor for the switch, which rotor is rotatable about said axis by rotation of the barrel.
In order to transmit torque from the barrel to the cam and rotor, a known device of the kind specified has an intermediate driving member in the form of a shaft with a non-circular cross section which extends from the barrel through an aperture in the cam and an aperture in a rear wall of the body and engages in respective sockets formed in the barrel and in the switch rotor, both sockets and the aperture in the cam having a non-circular cross section which is complementary to that of the shaft so that the required torque transmitting relation is established. The aperture in the rear wall of the body receives the shaft with a substantial clearancess that rotation of the shaft relative to the body is not impeded.
Normally, when the known device hereinbefore referred to is in use, the shaft is inaccessible. A thief may be able to obtain access to the shaft by removing the switch and rotor from the body. The thief could then withdraw the shaft either from the body or, at least, from the socket of the barrel. When the key is absent, the barrel is held against rotation, but it will be understood that if the shaft can be withdrawn axially from the socket of the barrel, the shaft and the cam can be rotated to remove the bolt to a releasing position. Alternatively, if the shaft can be removed entirely from the body and tool inserted into the aperture of the cam, the bolt can be moved to its releasing position by means of the cam.
According to the present invention, there is provided a device of the kind specified wherein the rotor and the body have respective formations which normally can cooperate in a manner such that axial displacement of the rotor relative to the body in a direction away from the barrel is restricted but which when the rotor is in a predetermined rotational position relative to the body do not restrict such axial displacement, and wherein rotation of the rotor into said predetermined position can be achieved only by rotation of the barrel into a corresponding position subsequent to the insertion of the correct key into said key receiving slot.
The invention will now be described by way of example with reference to the accompanying drawings wherein: Figure 1 shows a cross section of a device in accordance with the invention and an associated switch, the cross section being in a plane containing an axis of the device and Figure 2 shows a fragmentary view on the arrow II of Figure 1, only an external rotor of the switch being shown.
The device shown in Figure 1 comprises a body formed of first and second parts, 1 and 2 respectively. The body supports a lock barrel 3 for rotation about an axis 4 of the device. The barrel contains tumblers arranged in a known manner so that when the correct key (not shown) is inserted into the barrel 3, the tumblers are withdrawn into the barrel and when the key is absent, end portions of the tumblers project radially from the barrel into channels (not shown) formed in the second body part 2 so that rotation of the barrel is then prevented.
A bolt 5 is mounted in the second body part 2 for movement transversely of the axis 4 between a docking position shown in Figure 1 and a releasing position in which a tip of the bolt is withdrawn substantially into the body. The bolt is urged towards its locking position by a spring 6. The bolt is carried on a lifting head 8 and a cam 9 is provided for engaging the lifting head and displacing the bolt 5 from the locking position to the releasing position.
The cam is mounted in the second body part adjacent to a rear wall 10 thereof for rotation about the axis 4.
For retaining the bolt in its releasing position until the key is withdrawn from the barrel, there is provided a retaining element 11 which is mounted in the second body part 2 at one side of the barrel 3 for sliding movement parallel to the axis 4. The barrel 3 and retaining element 11 are provided with co-operating cam formations which, when the key has been inserted into the barrel and the barrel is then rotated in the clockwise direction, displace the retaining element towards the bolt lifting head 8.
Such rotation of the barrel also causes the bolt to be withdrawn to its releasing position and when this position is reached, a plunger 12 slidably mounted in the bolt lifting head is displaced forwardly by a spring 13 into overlapping relation with a part of the retaining element so that the latter then obstructs movement of the bolt to its locking position.
Over the major part of the permitted range of rotation of the barrel 3, the co-operating formations on the barrel and on the retaining element 11 hold the retaining element in its rearward position. During return of the barrel towards its initial rotational position, just before the cooperating cam formations on the barrel 3 and retaining element 11 would permit forward movement of the retaining element, a plunger 14 which is mounted in the retaining element 11 for sliding movement transversely of the axis 4 engages in a peripheral groove formed in the barrel 3 arid holds the retaining element in its rearward position during a further part of the reverse rotation of the barrel. During such further part of the reverse rotation, the cooperating cam formations move apart.
When the barrel is near to its initial rotational position, after having been rotated sufficiently to move the retaining element to its rearward position, forward movement of the retaining element 11 is prevented by a slider 15 which, when the key is present, projects radially from the barrel. During reverse rotation of the barrel, shortly after control of axial movement of the retaining element has been assumed by the slider 15, the plunger 14 moves up a ramp out of its peripheral groove onto the peripheral surface of the barrel.
When the barrel is returned to its initial rotational position, the slider 15 still maintains the retaining member 11 in its rearward position. If the key is then withdrawn, the slider is permitted to move radially inwardly into the keyway of the barrel, the retaining element 11 then being permitted to move forwardly under the action of its springs 16 out of overlapping relation with the plunger 12, thereby freeing the bolt for movement to its locking position.
There is associated with the anti-theft device an electrical switch 17 which is received in a chamber defined by the body and situated rearwardly of the rear wall 10.
The switch includes switch contacts for controlling an accessory circuit, an ignition circuit and a starter motor circuit of a vehicle and has an internal rotor carrying one or more movable contacts. For driving the internal rotor, there is drivingly associated therewith an external rotor 18.
For transmitting torque from the barrel 3 to the cam 9 and to the rotor 18 associated with the switch there is provided a driving shaft 19. The shaft 19 extends rearwardly from the barrel 3 through a clearance opening in the bolt 5, through an aperture in the cam 9, through an aperture in the rear wall 10 into a socket formed in the switch rotor 18. A forward end portion of the shaft is received in a socket formed in the rear end of the barrel 3, this end portion of the shaft and the socket having respective complementary non-circular cross sections. A portion of the shaft which lies between the barrel and the cam 9 typically has a circular cross section.
That portion of the shaft 19 which is received within the apertures of the cam 9 and rear wall 10 and in the socket of the rotor 18 has a non-circular cross section formed by machining a flat on the shaft, thereby forming also a shoulder 20 at the position where the cross section of the shaft changes. The aperture of the cam 9 has a cross section complementary to that of the part of the shaft which is received in the aperture so that a torque-transmitting rela tion is established between the shaft and cam.
The shoulder 20 faces rearwardly, i.e. in a directon away from the barrel 3 and is in abuting relation with a forwardly presented face of the cam adjacent to the aperture thereof.
The cam 9 is considerably larger than the aperture in the rear wall 10 so that rearward movement of the cam relative to the body is limited. Accordingly, rearward movement of the shaft 19 relative to the body is limited by engagement of the shoulder 20 with the cam to a range of movement corresponding to the magnitude of clearance spaces between components of the device. This range of movement is such that a part of the shaft will always remain within the socket of the barrel 3 and rotation of the shaft will be prevented whilst the key is absent from the device. It will be understood that it is necessary to provide between relatively rotatable components of the device sufficient clearances to ensure that rotation will not be inhibited, bearing in mind that the components may be manufactured to within fairly wide tolerance limits.
At its end adjacent to the rear wall 10, the switch rotor 18 includes a radially outwardly projecting flange 21 in the periphery of which there is a notch 22. The second body part 2 includes an abutment 23 which is spaced rearwardly from the rear wall 10 and projects towards the axis 4 so that a recess 24 is defined between the abutment and the rear wall. During use of the device, a part of the flange 21 always lies within the recess 24 so that rearward displacement of the switch rotor 18 relative to the body is limited by co-operation between the abutment 23 and the flange. Thus, even if the main part of the switch 17 is removed from the body, access cannot be gained to the shaft 19 or to the cam 9 as the switch rotor 18 encloses the rear end of the shaft and covers the aperture in the rear wall 10.
The notch 22 has dimensions which are sufficiently large to enable the abutment 23 to pass through this notch when the switch rotor 18 is turned to an appropriate position by means of the barrel 3. It will be understood that this can be done only when the correct key is present in the barrel, rotation of the switch driving member being prevented when the key is absent. During assembly of the device, the key is used to turn the barrel to a position corresponding to that rotary position of the rotor 18 at which the abutment 23 can pass through the notch 22. The rotor 18 is then applied to the rear end of the shaft through chamber which receives the switch. When the abutment has passed completely through the notch, the key is used to turn the switch rotor 18 so that the flange 21 is moved into the recess 24.
In a modification which is not illustrated in the accompanying drawings, the cam is spaced somewhat from the rear wall of the body and there is formed on or secured on the shaft at a position between the cam and the rear wall an abutment which overlaps with the rear wall and thereby prevents the shaft being withdrawn rearwardly through the opening of the rear wall. In this modification, the cross section of that part of the shaft which lies between the cam and the barrel may be the same as the cross section of those parts which lie within the socket of the barrel and within the aperture of the cam.
WHAT WE CLAIM IS: 1. A device of the kind specified wherein the rotor and the body have respective formations which normally can co-operate in a manner such that axial displacement of the rotor relative to the body in a direction away from the barrel is restricted, but which when the rotor is in a predetermined rotational position relative to the body do not restrict such axial displacement, and wherein rotation of the rotor into said predetermined position can be achieved only by rotation of the barrel into a corresponding position subsequent to the insertion of the correct key into said key receiving slot.
2. A device according to claim 1 wherein the rotor includes a flange which normally overlaps with a co-operating projection on the body, but the flange having a notch through which the projection can pass when the barrel is rotated into said corresponding position.
3. A device according to claim 1 or claim 2 comprising an intermediate driving member for transmitting torque from the barrel to the cam and the rotor, said member having an abutment which cooperates with the body, or with a member which is constrained against displacement along the axis relative to the body, in a manner such that axial displacement of the driving member relative to the body in a direction away from the barrels restricted.
4. A device according to claim 3 wherein the abutment on the driving member is formed by a change in the cross section of the driving member.
5. A device according to claim 3 or claim 4 wherein the driving member extends through the cam in torque-transmitting relation therewith and has an abutment which faces axially away from the barrel and is engageable with the cam, the cam being constrained against displacement along the axis relative to the body in a direction away from the barrel.
6. A device according to claim 1 or claim 2 further comprising an intermediate driving member for transmitting torque from the barrel to the cam and to the rotor.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (10)

**WARNING** start of CLMS field may overlap end of DESC **. tion is established between the shaft and cam. The shoulder 20 faces rearwardly, i.e. in a directon away from the barrel 3 and is in abuting relation with a forwardly presented face of the cam adjacent to the aperture thereof. The cam 9 is considerably larger than the aperture in the rear wall 10 so that rearward movement of the cam relative to the body is limited. Accordingly, rearward movement of the shaft 19 relative to the body is limited by engagement of the shoulder 20 with the cam to a range of movement corresponding to the magnitude of clearance spaces between components of the device. This range of movement is such that a part of the shaft will always remain within the socket of the barrel 3 and rotation of the shaft will be prevented whilst the key is absent from the device. It will be understood that it is necessary to provide between relatively rotatable components of the device sufficient clearances to ensure that rotation will not be inhibited, bearing in mind that the components may be manufactured to within fairly wide tolerance limits. At its end adjacent to the rear wall 10, the switch rotor 18 includes a radially outwardly projecting flange 21 in the periphery of which there is a notch 22. The second body part 2 includes an abutment 23 which is spaced rearwardly from the rear wall 10 and projects towards the axis 4 so that a recess 24 is defined between the abutment and the rear wall. During use of the device, a part of the flange 21 always lies within the recess 24 so that rearward displacement of the switch rotor 18 relative to the body is limited by co-operation between the abutment 23 and the flange. Thus, even if the main part of the switch 17 is removed from the body, access cannot be gained to the shaft 19 or to the cam 9 as the switch rotor 18 encloses the rear end of the shaft and covers the aperture in the rear wall 10. The notch 22 has dimensions which are sufficiently large to enable the abutment 23 to pass through this notch when the switch rotor 18 is turned to an appropriate position by means of the barrel 3. It will be understood that this can be done only when the correct key is present in the barrel, rotation of the switch driving member being prevented when the key is absent. During assembly of the device, the key is used to turn the barrel to a position corresponding to that rotary position of the rotor 18 at which the abutment 23 can pass through the notch 22. The rotor 18 is then applied to the rear end of the shaft through chamber which receives the switch. When the abutment has passed completely through the notch, the key is used to turn the switch rotor 18 so that the flange 21 is moved into the recess 24. In a modification which is not illustrated in the accompanying drawings, the cam is spaced somewhat from the rear wall of the body and there is formed on or secured on the shaft at a position between the cam and the rear wall an abutment which overlaps with the rear wall and thereby prevents the shaft being withdrawn rearwardly through the opening of the rear wall. In this modification, the cross section of that part of the shaft which lies between the cam and the barrel may be the same as the cross section of those parts which lie within the socket of the barrel and within the aperture of the cam. WHAT WE CLAIM IS:
1. A device of the kind specified wherein the rotor and the body have respective formations which normally can co-operate in a manner such that axial displacement of the rotor relative to the body in a direction away from the barrel is restricted, but which when the rotor is in a predetermined rotational position relative to the body do not restrict such axial displacement, and wherein rotation of the rotor into said predetermined position can be achieved only by rotation of the barrel into a corresponding position subsequent to the insertion of the correct key into said key receiving slot.
2. A device according to claim 1 wherein the rotor includes a flange which normally overlaps with a co-operating projection on the body, but the flange having a notch through which the projection can pass when the barrel is rotated into said corresponding position.
3. A device according to claim 1 or claim 2 comprising an intermediate driving member for transmitting torque from the barrel to the cam and the rotor, said member having an abutment which cooperates with the body, or with a member which is constrained against displacement along the axis relative to the body, in a manner such that axial displacement of the driving member relative to the body in a direction away from the barrels restricted.
4. A device according to claim 3 wherein the abutment on the driving member is formed by a change in the cross section of the driving member.
5. A device according to claim 3 or claim 4 wherein the driving member extends through the cam in torque-transmitting relation therewith and has an abutment which faces axially away from the barrel and is engageable with the cam, the cam being constrained against displacement along the axis relative to the body in a direction away from the barrel.
6. A device according to claim 1 or claim 2 further comprising an intermediate driving member for transmitting torque from the barrel to the cam and to the rotor.
7. A device according to any one of
claims 3 to 6 wherein the intermediate driving member has an end portion of non-circular cross section which extends through the cam in torque trarismitting relation therewith.
8. A device according to any one of claims 3 to 7 wherein there is engagement of an end portion of the intermediate driving member with the barrel such that torque can be transmitted between the barrel and the driving member but the engagement itself does not prevent relative axial movement of the barrel and driving member away from each other.
9. A device according to any one of claims 3 to 8 wherein there is engagement of an end portion of the intermediate driving member with the rotor such that torque can be transmitted between the driving member and the rotor but the engagement itself does not prevent relative axial movement of the rotor and driving member away from each other.
10. A vehicle anti-theft device substantially as hereinbefore described with reference to and as shown in the accompanying drawings.
GB5091876A 1977-12-07 1977-12-07 Vehicle anti-theft device Expired GB1595062A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5091876A GB1595062A (en) 1977-12-07 1977-12-07 Vehicle anti-theft device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5091876A GB1595062A (en) 1977-12-07 1977-12-07 Vehicle anti-theft device

Publications (1)

Publication Number Publication Date
GB1595062A true GB1595062A (en) 1981-08-05

Family

ID=10457924

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5091876A Expired GB1595062A (en) 1977-12-07 1977-12-07 Vehicle anti-theft device

Country Status (1)

Country Link
GB (1) GB1595062A (en)

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee