Land vehicles – Wheeled – Extensible
Patent
1975-06-16
1976-04-06
Song, Robert R.
Land vehicles
Wheeled
Extensible
280 791, B62B 2118
Patent
active
039485382
ABSTRACT:
The self equalizing ball caster lift mat of the present invention includes a load support sub-assembly and a caster sub-assembly interconnected by a pressure member. The load support sub-assembly is a flat plate adapted for insertion under a load and for bearing the weight of a load. The caster sub-assembly comprises an alignment plate having a plurality of transverse bores therethrough arranged in an array. A ball caster is mounted for reciprocating movement in each of the bores.
REFERENCES:
patent: 171367 (1875-12-01), Estes
patent: 2671242 (1954-03-01), Lewis
patent: 2805098 (1957-09-01), Robinson
patent: 2830824 (1958-04-01), Young
patent: 3411802 (1968-11-01), Diller
patent: 3420541 (1969-01-01), Flurscheim
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