Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1979-04-30
1980-12-30
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
With particular coupling link
340 51, 340 63, 340 69, 340552, 340561, 340568, 340694, 280 3399C, 455 67, G08B 108, B60R 2508, B62D 3900
Patent
active
042426685
ABSTRACT:
A shopping cart theft prevention system which includes signal sending means and a receiver carried by the cart for receiving a cart-immobilizing or cart-mobilizing signal from the transmitter. The cart includes a frame and a sub-frame pivoted to the frame and bearing spaced cart-supporting wheels, the sub-frame being connected to the frame by a latch. The latch is opened whenever a signal is received from the transmitter by a receiver attached to the cart. Alternatively, a signal can be sent to keep the latch closed, and upon removal of the signal, the latch can be opened. The cart may carry a battery operated solenoid triggered by the radio signal. The plunger of the solenoid may comprise or activate a crossbar on the latch. Thus, when the solenoid is operated, the crossbar is moved so that the latch is open or closed, allowing the sub-frame and associated wheels to automatically swing out of operative position when open, thereby immobilizing the cart.
REFERENCES:
patent: 3157871 (1964-11-01), Umanoff
patent: 3394945 (1968-07-01), Steier et al.
patent: 3652103 (1972-03-01), Higgs
patent: 3809202 (1974-05-01), Tyszkiewicz
patent: 3892295 (1975-07-01), Hahto
Caldwell Sr. John W.
Crosland Donnie L.
Posta Jr. John J.
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