Miscellaneous hardware (e.g. – bushing – carpet fastener – caster – Casters – Antifrictionally swivelled
Patent
1991-06-26
1993-04-06
Jones, David
Miscellaneous hardware (e.g., bushing, carpet fastener, caster,
Casters
Antifrictionally swivelled
16 20, 16 31R, B60B 3300
Patent
active
051991314
ABSTRACT:
A caster assembly has a stem and ball bearing retainer made of a single homogeneous unit of reinforced plastic, a horn made of a single piece of reinforced plastic, a bottom bearing retainer made of a single piece of reinforced plastic, an upper set of ball bearings between the horn and the upper retainer, a lower set of ball bearings between the horn and the bottom retainer, with the bottom retainer being ultrasonically welded to the unitary stem and retainer.
REFERENCES:
patent: 2500886 (1950-03-01), Torkelson
patent: 4097954 (1978-07-01), Christensen
patent: 4348784 (1982-09-01), Fontana
patent: 4494271 (1985-01-01), Perlin et al.
patent: 4653139 (1987-03-01), Vollberg et al.
patent: 4707880 (1987-11-01), Doyle et al.
Babcock Industries Inc.
Jones David
LandOfFree
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