Beds – Sofa bed – Reverting back
Patent
1982-08-11
1985-12-24
Dorner, Kenneth J.
Beds
Sofa bed
Reverting back
5 68, 744248R, A61G 706, F16H 118
Patent
active
045596557
ABSTRACT:
A hospital bed includes a base and a mattress frame mounted on the base. The frame includes an articulated head section, the inclination of which is controlled by a motor. A screw oriented lengthwise of the bed is connected to the motor for rotation thereby. A nut is mounted on the screw for longitudinal movement therealong. A non-rotatable sleeve is mounted on the nut by bearings which permit rotation of the nut relative to the sleeve about the longitudinal axis. A linkage interconnects the sleeve with the frame head section for changing the inclination of the latter in response to longitudinal movement of the sleeve. An element mounted on the sleeve is movable into operable connection with the nut for preventing rotation of the nut and thereby constraining the nut for longitudinal movement along the screw in accordance with the speed of rotation of the screw. A manually actuable handle is mounted on the head section and is connected to the element for releasing the latter from the nut, allowing the nut to rotate upon the screw and travel longitudinally therealong independently of the speed of rotation of the screw. Thus, the head section of the frame can be lowered at a rapid rate, regardless of the operational speed of the motor.
REFERENCES:
patent: 1003865 (1911-09-01), Barnett
patent: 3154284 (1964-10-01), Martens et al.
patent: 3174161 (1965-03-01), Black
patent: 4038709 (1977-08-01), Kerwit
patent: 4250762 (1981-02-01), Weatherby
Dorner Kenneth J.
Hill-Rom Company, Inc.
Trettel Michael F.
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