IE44968B1 - Preventing unauthorised use of vehicles - Google Patents

Preventing unauthorised use of vehicles

Info

Publication number
IE44968B1
IE44968B1 IE1172/77A IE117277A IE44968B1 IE 44968 B1 IE44968 B1 IE 44968B1 IE 1172/77 A IE1172/77 A IE 1172/77A IE 117277 A IE117277 A IE 117277A IE 44968 B1 IE44968 B1 IE 44968B1
Authority
IE
Ireland
Prior art keywords
housing
plug portion
plug
lock
spark
Prior art date
Application number
IE1172/77A
Other versions
IE44968L (en
Original Assignee
Telcefo Security Prod Ab
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 Telcefo Security Prod Ab filed Critical Telcefo Security Prod Ab
Publication of IE44968L publication Critical patent/IE44968L/en
Publication of IE44968B1 publication Critical patent/IE44968B1/en

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
    • B60R25/04—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 propulsion system, e.g. engine or drive motor
    • B60R25/045—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 propulsion system, e.g. engine or drive motor by limiting or cutting the electrical supply to the propulsion unit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P11/00—Safety means for electric spark ignition, not otherwise provided for
    • F02P11/04—Preventing unauthorised use of engines

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Spark Plugs (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Fireproofing Substances (AREA)
  • Lubricants (AREA)
  • Tires In General (AREA)

Abstract

A method and a device t,o prevent unauthorized use oi` combustion engine driven ~ehicles~ .ships, equipmentg as ~ell as engrines on1y3 includîng the sl,eps to remove at, least one spark plug3 to attach a device having an externally threaded part as replacernent for the removed spa~k plug(s~, said par~ having an embracing loutsi~e memberg which by means o~ a lockin,.g mechanism can be brought into a freely rotata~le state in relation to the t.hreaded member, tlhus preventing removal of same, or, alterr-~at.i.vely~ bring sai.d melllbers into an interlocked relationship, thus enabling the device to be attached or removed frolll the engine.

Description

This invention relates to a device for immobilising a sparkignition internal combustion engine, by preventing the unauthorised re-insertion of a removed spark plug. The expression immobilising is intended to mean rendering the engine wholly or partially inoperable, it being appreciated that a multi-cylinder engine may require the removal of more than one spark plug to prevent it working at all. In this case more than one device may be used, or reliance may be placed on the malfunctioning of an engine with one plug missing. Alternatively, reliance may be placed on an optional feature of the device of the invention which will cause damage to the engine if an attempt is made to start it with the device in place.
The principal object of the invention is therefore to provide a device which will wholly or partially incapacitate a spark-ignition internal combustion engine to make difficult or impossible the unauthorised removal by means of the engine of the vehicle or boat propelled by the engine, even if the controls of the engine are accessible and the ignition circuit is complete. Competent car thieves fine it relatively easy to gain access to a locked car and short-circuit the ignition. Steering or gear lever locks have not proved adequate. In the case of boats, a lock which prevents the removal of an outboard motor will not prevent theft of the entire boat. If, however, the engine itself is incapacitated the removal of the vehicle or boat which it propels becomes more probelmatical, and in the case of outboard motors an engine which could not be used would not attract a thief. - 3 In accordance with the invention there is provided a device for immobilising a spark-ignition internal combustion engine, comprising a housing relatively rotatably connected to an externally screw-threaded plug portion extending from the housing, and a lock operable to engage the housing to the plug portion for joint rotation, the arrangement being such that a spark plug of an engine can be replaced by the device, the plug portion being screwed into . the vacated spark plug bore until it is inaccessible for counterrotation except by means of the housing, the lock being operable to engage the housing and plug portion for joint rotation when it is desired to unscrew the plug portion from the bore by rotating the housing.
The housing is preferably tubular and the lock is preferably located inside the housing. The lock may be of the barrel type and is preferably rotatable relative both to the housing and the plug portion when unlocked. The lock may have bolts received in recesses respectively in the housing and the plug portion when locked, and the lock may be spring-loaded to a locked condition and unlockable against the spring loading by a key.
The housing and plug portion may be rotatably connected by a spring ring received in annular recesses respectively in the inner periphery of the housing and the plug portion.
The plug portion may have a free end section designed to extend into the associated cylinder when the plug portion is screwed into a spark plug bore so as to contact a piston reciprocated in said cylinder. Said free end section may be pointed to adapt it to damage said piston, and it may be removable from the remainder of the plug portion so that its use is optional.
The housing is preferably of polygonal external shape to adapt it to be rotated by a plug spanner.
The housing is preferably manufactured from hardened steel, such as carbide steel.
Preferred embodiments of the invention will now be described with reference to the accompanying drawings, in which :Figure 1 is a sectional elevation of a device in accordance with the invention mounted in a spark-plug bore of an engine cylinder head.
Figure 2 is a plan view of the device of Figure 1, ·/ Figure 3 is a view similar to Figure 1 but showing the device in the locked condition, and Figure 4 is a view similar to Figure 1 of a modified device.
The device illustrated in Figures 1-3 comprises a tubular housing 1 of hardened steel, such as carbide steel, relatively rotatably connected to an externally screw-threaded plug portion 2 by means of a ring 3 of spring steel which is located in a peripheral groove in the internal wall of the housing 1 and a peripheral groove around the shank of the plug portion 2 above its 3crew-thread. Located in the housing 1 is a barrel-type lock 4 which has bolts or pins 5 which, under the influence of a key 6, can be made to extend from the lock, pins extending radially into recesses in the inner wall of the housing 1 and pins 5^ extending axially into recesses in the top of the plug portion 2.
In this way the lock 4 can be made to interconnect the housing 1 and plug portion 2 for joint rotation, but in the unlocked condition (to which the pins 5 and 5 are preferably spring-biased) the lock 4 is freely rotatable relative both to the housing 1 and the plug portion 2 and therefore the housing 1 is freely rotatable relative to the plug portion 2.
The manner of use of the device is as follows:4486s - a Having removed a spark plug (not shown) from the cylinder head the plug portion 2 is screwed in its place. Conveniently, and as shown in Figure 2, the housing 1 is polygonal so that a plug spanner can be used to screw the device into a plug bore.
The device is screwed in until the plug portion 2 is inaccessible exteriorly of the engine and can only be counter-rotated by means of the housing 1. The lock 4 is now unlocked, so that if the housing 1 is turned in an attempt to unscrew the plug portion 2 all that will happen is that the housing 1 will rotate relative to the plug portion 2. This condition of the device is shown in Figure 3. When it is desired to remove the device and re-insert the spark plug the key 5 is used to operate the lock 4 so that by turning the housing 1, e.g. with a plug spanner, the plug portion 2 can be unscrewed.
In tha embodiment of Figures 1-3, the free end of the plug portion 2 terminates in a pointed, projection 7 designed to extend into the cylinder where it will contact the piston if this reciprocates in the cylinder with the device in situ. The resulting damage to the engine will immobilise it even if it is of a multicylinder type which would not be fully incapacitated by the removal of a single spark plug.
The embodiment of Figure 4 is similar in all respects to that of Figures 1-3 except that the pointed projection 7 on the free end of the plug portion 2 is removable therefrom by unscrewing it before ths device is used if this feature of the device is not desired. With the projection 7 removed the free end of the plug portion 2 is flush with the inner surface of the cylinder head and will not damage the piston.

Claims (13)

CLAIMS:
1. A device for immobilising a spark-ignition internal combustion engine, comprising a housing relatively rotatably connected to an externally screw-threaded plug portion extending from the housing, and a lock operable to engage the housing to the plug portion for joint rotation, the arrangement being such that a spark plug of an engine can be replaced by the device, the plug portion being screwed into the vacated spark plug bore until it is inaccessible for counter-rotation except by means of the housing, the lock being operable to engage the housing and plug portion for joint rotation when it is desired to unscrew the plug portion from the bore by rotating the housing.
2. A device as claimed in claim 1, wherein the housing is tubular and the lock is located inside the housing.
3. A device as claimed in claim 2, wherein the lock is of the barrel type and is rotatable relative both to the housing and the plug portion when unlocked.
4. A-device as claimed in any one of the preceding claims, wherein the lock has bolts received in recesses respectively in the housing and the plug portion when locked.
5. A device as claimed in any one of the preceding claims, wherein the lock is spring-loaded to a locked condition and can be unlocked against the spring loading by a key.
6. A device as claimed in any one of the preceding claims, in which the housing and plug portion are rotatably connected by a spring ring received in annular recesses respectively in the inner periphery of the housing and the plug portion.
7. A device as claimed in any one of the preceding claims, wherein the plug portion has a free end section designed to extend 4496® into the associated cylinder when the plug portion is screwed into a spark plug bore so as to contact a piston reciprocated in said cylinder.
8. A device as claimed in claim 7, wherein said free end 5 section is pointed to adapt it to damage said piston.
9. A device as claimed in claim 7, or claim 8, wherein said free end section is removable from the remainder of the plug portion.
10. A device as claimed in any one of the preceding claims, 10 wherein the housing is of polygonal external shape to adapt it to be rotated by a plug spanner.
11. A device as claimed in any one of the preceding claims, wherein the housing is manufactured from hardened steel,
12. A device for immobilising a spark-ignition internal
13. 15 combustion engine substantially as herein described with reference to and as shwa in Figures 1-3 or Figure ί of the accompanying drawings.
IE1172/77A 1976-06-08 1977-06-08 Preventing unauthorised use of vehicles IE44968B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7606432A SE404159B (en) 1976-06-08 1976-06-08 WAY TO PREVENT UNAUTHORIZED USE OF COMBUSTION ENGINE POWERED VEHICLES, VESSELS, EQUIPMENT LIKE ENGINES, AND ANY DEVICE FOR EXERCISE OF THE KIT

Publications (2)

Publication Number Publication Date
IE44968L IE44968L (en) 1977-12-08
IE44968B1 true IE44968B1 (en) 1982-05-19

Family

ID=20328157

Family Applications (1)

Application Number Title Priority Date Filing Date
IE1172/77A IE44968B1 (en) 1976-06-08 1977-06-08 Preventing unauthorised use of vehicles

Country Status (14)

Country Link
JP (1) JPS5317804A (en)
AT (1) AT358333B (en)
AU (1) AU508331B2 (en)
BE (1) BE855455A (en)
CA (1) CA1096255A (en)
DE (1) DE2725808A1 (en)
DK (1) DK253077A (en)
ES (1) ES459590A1 (en)
FR (1) FR2354455A1 (en)
GB (1) GB1577812A (en)
IE (1) IE44968B1 (en)
IT (1) IT1082101B (en)
NL (1) NL7706277A (en)
SE (1) SE404159B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8804160U1 (en) * 1988-03-26 1988-07-28 Friedrich Marx GmbH & Co, 2000 Hamburg Anti-theft protection
JP2524849B2 (en) * 1990-02-24 1996-08-14 追浜工業 株式会社 Work equipment safety equipment
SE501659C2 (en) * 1993-10-01 1995-04-10 Sten Aastroem Device for preventing unauthorized use of a motor
WO1997002435A1 (en) * 1995-07-06 1997-01-23 Thomas Arthur Hamblyn Theft deterrent device
AUPO729997A0 (en) * 1997-06-11 1997-07-03 Cleland, Glen Irving Engine disabling apparatus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE515827C (en) * 1931-08-03 Georg Krause Security device against theft of motor vehicles
US1511001A (en) * 1922-02-06 1924-10-07 Padden James Spark-plug locking device
FR656880A (en) * 1928-07-02 1929-05-14 Security device against theft of motor vehicles

Also Published As

Publication number Publication date
SE7606432L (en) 1977-12-09
AU2594977A (en) 1978-12-14
CA1096255A (en) 1981-02-24
GB1577812A (en) 1980-10-29
NL7706277A (en) 1977-12-12
FR2354455A1 (en) 1978-01-06
DK253077A (en) 1977-12-09
IE44968L (en) 1977-12-08
JPS5317804A (en) 1978-02-18
ES459590A1 (en) 1978-11-16
SE404159B (en) 1978-09-25
IT1082101B (en) 1985-05-21
AT358333B (en) 1980-09-10
AU508331B2 (en) 1980-03-20
ATA403377A (en) 1980-01-15
DE2725808A1 (en) 1977-12-22
BE855455A (en) 1977-10-03

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