Miscellaneous hardware (e.g. – bushing – carpet fastener – caster – Casters – Locked
Patent
1989-11-01
1991-03-12
Seidel, Richard K.
Miscellaneous hardware (e.g., bushing, carpet fastener, caster,
Casters
Locked
188112, B60B 3300
Patent
active
049983202
ABSTRACT:
The legs of a hospital bed are mounted on discrete casters with brakes for the wheels and blocking devices for the wheel frames. The wheel frames can be unblocked to swivel in their carriers which are mounted in or on the respective legs, and contain cylinders for vertically movable plungers serving to engage or disengage the respective brakes as well as to activate or deactivate the blocking devices. At least two plungers are movable to three different positions in one of which the respective wheels are free to rotate and the respective frames are free to swivel, in another of which the wheels are braked and the frames are blocked, and in the third of which the wheels are free to rotate but the frames are blocked. This is achieved by the provision of a control system employing discrete cylinder and piston units for the casters and conduits which can supply metered quantities of hydraulic fluid from the cylinders of the respective units to the cylinders in the corresponding carriers or vice versa. The pistons of all cylinder and piston units are biased against a common indexible cam.
REFERENCES:
patent: 3409105 (1968-11-01), Clinton
patent: 4653139 (1987-03-01), Vollberg
patent: 4658466 (1987-04-01), Vollberg
patent: 4720893 (1988-01-01), Mellwig
patent: 4765021 (1988-08-01), Mellwig
Albert Schulte Sohne GmbH. & Co.
Cuda Carmine
Kontler Peter K.
Seidel Richard K.
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