Land vehicles – Wheeled – Nesting vehicles
Patent
1984-01-06
1986-03-25
Mitchell, David M.
Land vehicles
Wheeled
Nesting vehicles
188 112, 188 31, 188 69, 188163, B62D 3900
Patent
active
045778809
ABSTRACT:
Theft-prevention apparatus for a shopping cart of the type having a carriage body, a plurality of wheels and a plurality of wheel support yokes secured to the carriage body for rotatably supporting the plurality of wheels, including a pin extending from one of the wheels; a ball movable between a first inoperative position and a second operative position at which the ball is engageable with the pin; a plate secured to the respective wheel support yoke and having a cut-out section defining an aperture; a ball support cage having an inclined surface for supporting the ball at the first inoperative position out of alignment with the aperture such that said ball rests against the plate; and a solenoid secured to the plate for moving the ball support cage to a position adjacent the aperture in response to movement of the shopping cart in the proximity of a predetermined magnetic field to cause the ball to move from the first inoperative position through the aperture to the second operative position, such that the ball is wedged between the plate and the pin upon continued rotation of the respective wheel to prevent further rotation thereof.
REFERENCES:
patent: 3031037 (1962-04-01), Stollman
patent: 3031038 (1962-04-01), Chait
patent: 3117655 (1964-01-01), Skupas et al.
patent: 3356185 (1967-12-01), Isaacks
patent: 3495688 (1970-02-01), Isaacks
patent: 3652103 (1972-03-01), Higgs
patent: 3892295 (1975-07-01), Hahto
patent: 4199043 (1980-04-01), Lankester et al.
patent: 4242668 (1980-12-01), Herzog
Bobis Daniel H.
Culbreth Eric
Mitchell David M.
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