Miscellaneous hardware (e.g. – bushing – carpet fastener – caster – Casters – Adjustable
Patent
1993-02-08
1994-09-20
Larson, Lowell A.
Miscellaneous hardware (e.g., bushing, carpet fastener, caster,
Casters
Adjustable
16 18R, 16 44, B60B 3300
Patent
active
053476808
ABSTRACT:
A retracting caster assembly is provided with a frame, a lever, a spring, a roller, and a manual retracting bolt. The lever is pivotally connected to the frame. The roller is connected to a first end of the lever. A spring loading member connects the spring to a second end of the lever. The spring biases the lever at a first position with the roller extended from the frame. The manual retracting bolt is adapted to manually move the lever to a second position with the roller retracted. The lever is suitably sized, shaped, and connected to the frame to hold the frame at a minimum predetermined distance from the ground until a predetermined weight is applied to the frame, at which point the linkage and lever arrangement decreases the mechanical advantage of the spring as the roller retracts, thereby minimizing the force required to retract the roller.
REFERENCES:
patent: Re24230 (1956-10-01), Pearne
patent: 1958905 (1934-05-01), Anderson
patent: 2139503 (1938-12-01), Jordan
patent: 2227875 (1941-01-01), Boden
patent: 2271304 (1942-01-01), Mulholland
patent: 2282506 (1942-05-01), Wachter
patent: 2582716 (1952-01-01), Nelson
patent: 2707795 (1955-05-01), Skupas
patent: 2891764 (1959-06-01), Pearne
patent: 3441974 (1969-05-01), Dean
patent: 4763910 (1988-08-01), Brandli
patent: 4783879 (1988-11-01), Weaver
Anderson Terry J.
Gurley Donald M.
Hoch Jr. Karl J.
Larson Lowell A.
Northrop Corporation
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