Braking means for shopping cart

Details Braking means for shopping cart Braking means for shopping cart

1996-08-22

1997-09-09

Poon, Peter M.

Brakes

To retard rolling of caster

188 19, 16 35R, B60B 3300, B62B 504

Patent

active

056646453

ABSTRACT:
A shopping cart has automatically applied brakes when the cart is at rest. The braking for the cart is by rotating the two casters to be non-parallel to each other so the cart will not roll. Any structure for rotating the casters may be used, but the preferred embodiment has an undulating upper bearing race so the weight of the cart urges the upper race down and causes the balls to seek high points on the upper race. The balls are caged, and the cage is fixed to the lower race, so the wheels of the casters are rotated when the balls enter the high areas. The upper bearing races are oriented to achieve the desired positioning of the caster wheels.

REFERENCES:
patent: 2799514 (1957-07-01), Kramcsak, Jr.
patent: 5012550 (1991-05-01), Schlosser

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