Lock assembly for shopping cart to prevent its removal from an a

Details Lock assembly for shopping cart to prevent its removal from an a Lock assembly for shopping cart to prevent its removal from an a

1978-10-05

1980-04-22

Halvosa, George E. A.

Brakes

Operators

Automatic

188 31, 188167, 280 3399C, B60T 718

Patent

active

041990439

ABSTRACT:
A boundary responsive wheel lock assembly for a supermarket shopping cart, or the like, or for any other application where a wheeled device is to be boundary responsive, is provided, to prevent the removal of the cart from an authorized area. The assembly includes a roller which is mounted on the distal end of an arm which, in turn, is pivotally mounted to a bracket to be positioned adjacent to one of the wheels of the cart. A spring-loaded plunger is also mounted on the bracket, and the plunger is normally held in a cocked position by the arm as the roller moves along the floor of the supermarket or along the surface of the adjacent parking lot. The parking lot is surrounded by a barrier which extends, for example, one and a half inches above the ground. However, the flexibility of the assembly of the invention enables the assembly to respond to a variety of boundary heights. Any attempt to remove the cart from the parking lot causes the roller to roll up the barrier and thereby causes the pivotally mounted support arm to turn about its pivot axis and release the plunger. The plunger then moves against the side of the adjacent wheel of the cart and is received in a slot in the wheel to lock the wheel. The assembly may be reset by an authorized employeed, by inserting a key into a slot in the plunger mechanism, and by turning the key to force the plunger back against the biasing spring, and by then turning the arm to its normal angular position in which it holds the plunger in its cocked condition.

REFERENCES:
patent: 1108794 (1914-08-01), Say
patent: 3029905 (1962-04-01), Nowak
patent: 3366201 (1968-01-01), Pesta
patent: 3608693 (1971-09-01), Stosberg et al.
patent: 3652103 (1972-03-01), Higgs

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