AU655818B2

AU655818B2 - Anti theft device

Info

Publication number: AU655818B2
Application number: AU16197/92A
Authority: AU
Inventors: Alan Norman Bilton
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-07-09
Filing date: 1992-05-12
Publication date: 1995-01-12
Anticipated expiration: 2011-08-09
Also published as: AU1619792A

Description

1 655818 COMMONWEALTH OF AUSTRALIA Patents Act 1990 **s 0* 4 .04*4 Name of Applicant: Address of Applicant: Actual Inventor: Address for Service: ALAN NORMAN BILTON 22 George Street BURLEIGH HEADS QLD 4220 ALAN NORMAN BILTON GRANT ADAMS COMPANY Patent Trade Mark Attorneys Level Santos House 215 Adelaide Street BRISBANE QUEENSLAND 4000

AUSTRALIA

THE INVENTION ENTITLED f a f i if -i i' 1 COMPLETE SPECIFICATION FOR "ANTI THEFT DEVICE" The following statement is a full description of the invention including the best method of performing it known to the applicant.

_111 THIS INVENTION relates to the improvements of an anti theft device for commercial, house and marine security.

It is an object of the present invention to provide a security device for protecting personal and valued property.

In a broad aspect the present invention resides in a security device including: a body having an elongate bore; first and second relieving ports in the body in communication with the bore; a piston slidably mounted in the bore and movable between a first, released position and a second, o. locked position; 15 first and second relieving grooves on the piston in communication with the bore; a cut away lock groove in the piston; 0 0means to move the piston between the first position and the second position; biassing means in the bore urging the piston 4r44 o to the first position; and 4, a locking device in the body, transverse to 4e*4 the bore, operable to releasably engage the lock groove and lock the piston in the second position; 25 so arranged that in the first position of 4 the piston, the relieving grooves on the piston allow fluid to pass through the relieving ports, and in the second position, the relieving ports are blocked to prevent fluid passing therethrough.

Preferably the means to move the piston include manual operation, vacuum, air pressure or a solenoid.

Preferably the locking device is operated by a solenoid.

Preferably the body is adapted to allow movement of the piston between the first and second positions in a horizontal direction.

Preferably the cut away groove has an inclined side wall, forming an abutment, engageable by a tooth on the locking device.

To enable the invention to be fully understood, a preferred embodiment of the invention will now be described with reference to the accompanying drawings, in which FIGS 1, 2 and 3 are sectional side views of the security device in operation.

Referring to Figs. 1, 2 and 3 the anti-theft device has an oblong block 1 of metal structure which has a bore 2 placed central lengthwise with a dead end 15 it has two relieving ports 13, 15, 14 and 16 inserted in the body is a proportional piston 3 which has two relieving grooves 25 and 26 included which allows fluid from the master cylinder to pass through these to ports 14 and 16 and 13 and 15 to the front and rear brakes.

Also has four sealing grooves 6 and 7 and 8 and 9 and in the centre of the proportional piston 3 is a cutaway key groove 10 the open end of the body 11 houses a end plug 12 which screws into the body flush to the outside face and in the centre of the end plug 17 which has a fine 25 thread where a threaded rod 18 screws into and just up from the threaded end of the rod 18 has a groove 19 to install a circlip At the other end of the rod affixed to is a control knob 21 when turned clockwise pushes the proportional piston 3 down the bore 2 after the footbrake has been applied to the on position.

At the base of the body 1 houses a switch 22 so as when the proportional piston 3 is moved to the on position as shown in Fig. 3 grooves 13 and 15 and 16 and 14 are blocked from communication so that pressure is

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se-IlI 4 maintained in hydraulic control side to hold brakes on the switch 22 is then engaged which defines the amount of travel which allows a light to come on indicating solenoid rod key 23 is in position of cutaway groove key 10 turning the control knob 21 anti clockwise until light goes off puts the solenoid rod key 23 into lock position before releasing control knob 21 to move to off position apply the brakes then turn the control knob 21 clockwise until switch 22 is engaged and the light comes on and it is safe to turn the ignition switch on and release the solenoid rod key 23 and then turn the control knob 21 anti clockwise to the off position.

Housed in the bottom of the bore 2 is a compression ;spring 24 which pushes the proportional piston 3 back to IT1 15 its off position.

i C I .4 o f

Claims

2. A security device as claimed in claim 1 25 wherein: the means to move the piston include manual operation, vacuum, air pressure or a solenoid.
3. A security device as claimed in claim 1 or claim 2 wherein: the locking device is operated by a solenoid.
4. A security device as claimed in any one of Claims 1 to 3 wherein: a respective pair of seals are provided on the piston, in sealing engagement with the bore, for each relieving groove. L~S 3 i 6 A security device as claimed in any one of claims 1 to 4 wherein: the body is adapted to allow movement of the piston between the first and second positions in a horizontal direction.
6. A security device as claimed in, any one of claims 1 to 5 wherein: the cut away groove has an inclined side wall, forming an abutment, engageable by a tooth on the locking device. DATED this twelfth day of October 1994. ALAN NORMAN BILTON By his Patent Attorneys GRANT ADAMS COMPANY a a.4aa a0 a a. ar o a aa *au)* ®RA