Manual/electric twin jack bed

Details Manual/electric twin jack bed Manual/electric twin jack bed

1990-05-08

1991-11-12

Trettel, Michael F.

Beds

Sofa bed

Reverting back

5 86, A61G 100

Patent

active

050636243

ABSTRACT:
A mobile hospital stretcher includes a movably supported base, and two spaced hydraulic cylinders on the base which vertically movably support a support member having an upwardly facing support surface. Separate control systems are provided for the hydraulic cylinders, one of which is electrically powered and the other of which is mechanically powered. The electrically powered system includes an electrically actuable valve for selectively bleeding fluid from one of the cylinders, an electrically actuable pump for supplying fluid to the other cylinder, a limit arrangement which produces a signal when the first cylinder is fully retracted, a manually operable switch for electrically actuating the valve, and an arrangement responsive to the presence of the first signal during actuation of the switch for electrically actuating the pump.

REFERENCES:
patent: 2687536 (1954-08-01), Miller
patent: 3393004 (1968-07-01), Williams
patent: 3724003 (1973-04-01), Ellwanger et al.
patent: 3814414 (1974-06-01), Chapa
patent: 3902204 (1975-09-01), Lee
patent: 3993051 (1976-11-01), Maruyama
patent: 4078269 (1978-03-01), Weipert
patent: 4912787 (1990-04-01), Bradcovich

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