Auto anti-theft system

Fluid-pressure and analogous brake systems – Locks

Patent

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Details

1375525, 180287, 188353, B60R 2508

Patent

active

041969391

ABSTRACT:
A vehicle anti-theft device which is mounted on or in the instrument panel of said vehicle and which is connected into the brake fluid line that extends from the master cylinder to the brake wheel cylinders. By closing the valve while the vehicle brake pedal is depressed, fluid under pressure is trapped between the anti-theft device and the wheel brake cylinders, locking the wheels. The closed valve prevents reverse flow of the pressurized braking fluid until an authorized person in possession of the proper dial symbol to reference mark combination once again manually reorientates the set of dials that are attached to a plurality of cylinder valve port tubes and one spool that are rotated in proper sequence to bring all the tube ports in alignment with the casing ports. The valve consists of a body or casing and a plurality of cylindrical valve port tubes and one valve port spool (preferred number being three) the largest of which slips into the casing bore with each of the other cylinders or spools of progressively decreasing diameters their outside diameters fitting each of the compatible inside diameters, and then are held in that position by a securing device at each end; in the case shown, snap rings at one end and calibrated dials at the opposite end. The combination feature eliminates the inconvenience of carrying an extra key such as is required in the cases of some prior art.

REFERENCES:
patent: 1427239 (1922-08-01), Spencer
patent: 1444083 (1923-02-01), Porteous
patent: 2551993 (1951-05-01), Benedek
patent: 4027923 (1977-06-01), Saito
patent: 4040675 (1977-08-01), Richmond

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