Beds – Invalid bed or surgical support – Vertically movable support for whole body of user
Patent
1992-10-15
1994-08-16
Trettel, Michael F.
Beds
Invalid bed or surgical support
Vertically movable support for whole body of user
5 11, 254106, 254124, 74128, A61C 700
Patent
active
053374282
ABSTRACT:
An adjustable bed includes a base frame, a mattress frame and linkage for mounting the mattress frame for relative movement with respect to the base frame. A mechanical jack is operatively connected to the base frame and the linkage for moving the mattress frame between high and low positions. A mechanical jack includes an enclosure. A bearing supports a ram within the enclosure for extension and retraction. A drive plate and a hold plate define apertures through which the ram extends. A drive bar is shifted by rotation of an actuator shaft to lock the drive plate to the ram and extend the ram from the housing. The drive spring resiliently biases the drive plate to an unlocked or return position. A hold spring biases the hold plate to a locked position to prevent return movement of the ram into the enclosure. A release bar is shifted into engagement with the hold plate upon reverse rotation of the actuator shaft to release the plate and permit lowering of the ram into the enclosure.
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Krauska Bernard J.
Peterson Warren J.
Wisniewski Randy
Joerns Healthcare Inc.
Trettel Michael F.
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