Shopping cart swivel yoke assembly with plastic bearing races

Details Shopping cart swivel yoke assembly with plastic bearing races Shopping cart swivel yoke assembly with plastic bearing races

1992-06-08

1994-02-22

Bradley, Paula A.

Miscellaneous hardware (e.g., bushing, carpet fastener, caster,

Casters

Antifrictionally swivelled

16 21, 16 36, B60B 3300

Patent

active

052875946

ABSTRACT:
An improved swivel yoke assembly for use on shopping carts. The yoke assembly is of the type having a steel yolk with forks which support a wheel. The yolk is permitted to swivel because it is supported between an upper and a lower set of ball bearings. The improvement comprises a polymeric bearing race below the upper set of ball bearings and a second polymeric bearing race above the lower set of ball bearings. The upper ball bearing race has a compound curve. The metal bearing races do not have to be heat treated and, thus, can be more accurately dimensioned. The assembly is better able to withstand the loss of lubricant in shopping cart washing operations.

REFERENCES:
patent: 3231926 (1966-02-01), Stollman
patent: 3837039 (1974-09-01), Rehrig
patent: 3901569 (1975-08-01), Uehara
patent: 4084288 (1978-04-01), Black
patent: 4219903 (1980-09-01), Black
patent: 4348784 (1982-09-01), Fontana
patent: 4707880 (1987-11-01), Doyle et al.

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