Adjustable bed

Details Adjustable bed Adjustable bed

1999-06-09

2001-05-15

Grosz, Alexander (Department: 3628)

Beds

Invalid bed or surgical support

Vertically movable support for whole body of user

C005S616000

Reexamination Certificate

active

06230344

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to adjustable beds and more particularly to bed frames used in such beds. The bed frames are of the type which provide for elevation of a main support between raised and lowered positions and are particularly suitable for use by patients who require that the bed be lowered into a minimal height position.
BACKGROUND OF THE INVENTION
Adjustable bed frames are available in many forms. Mechanisms used to elevate and lower the bed frames include electro-mechanical, pneumatic, cable and pulley, and various devices involving a variety of mechanical linkages. In general, the structures include a main support and a pair of mechanisms located at the respective head and foot ends of the main support. The mechanisms are operable to change the elevation of the main support and in some cases to change the longitudinal orientation of the main support relative to horizontal. Such structures are often complicated require mechanical interconnection between the mechanisms to ensure that during elevation the main support is maintained in a fixed relationship to the horizontal.
The present invention is intended to provide an adjustable bed frame capable of being lowered as close to a support surface as possible while providing access under the bed frame for the feet of a patient lifting device and also maintaining the option of elevating the bed fame into a normal position for use.
SUMMARY OF THE INVENTION
In one of its aspects the invention provides an adjustable bed frame having a main support including head and foot ends. The support is movable between raised and lowered positions and independent first and second elevating mechanisms are coupled to the main support. The mechanisms are spaced from one another on the main support to carry the bed frame on a support surface. An electrical supply system provides power to actuate the mechanisms to change the height of the main support above the support surface and a controller is coupled to the supply system to selectively activate the first and second elevating mechanisms to move the main support between raised and lowered positions.
Preferably each of the first and second elevating mechanisms includes a DC motor and a worm drive coupled to the DC motor. The worm drive has stops corresponding to the raised and lowered positions so that on using the controller to move the independent first and second elevating mechanisms to bring the main support into said raised or lowered positions, the worm drives will meet the corresponding stops to ensure the main support is horizontal in the raised and lowered positions.


REFERENCES:
patent: 3462772 (1969-08-01), Morrison
patent: 4097939 (1978-07-01), Peck et al.
patent: 4638516 (1987-01-01), Vrzalik
patent: 5095562 (1992-03-01), Alexander
patent: 5205004 (1993-04-01), Hayes et al.
patent: 5245718 (1993-09-01), Krauska
patent: 5257428 (1993-11-01), Carroll et al.
patent: 5613255 (1997-03-01), Bish et al.
patent: 5669090 (1997-09-01), Basgall

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