Beds – With means for relocating an invalid – With a hoisting – lifting – elevating – or raising device
Reexamination Certificate
2008-02-15
2010-11-23
Santos, Robert G (Department: 3673)
Beds
With means for relocating an invalid
With a hoisting, lifting, elevating, or raising device
C005S089100, C005S652000, C005S940000, C340S573100, C340S665000, C340S666000
Reexamination Certificate
active
07836529
ABSTRACT:
A method and apparatus is disclosed for sensing when a person is disposed on or arises from a support that flexes or sags when a person is disposed thereon. Such supports include beds, supports for a mattress or a seat, such as a sling-type seat found on wheelchairs. In one embodiment, an assembly is positioned beneath the support and includes a sensor. The sensor indicates when tension on the assembly exceeds a certain amount which is indicative of sagging of the support. The assembly may be adjustable in length to maintain proper tension in the absence of sag. The sensor may be a switch that includes a plunger which operates against the bias of a biasing member which either completes or interrupts an electrical circuit in response to tension placed on the assembly due to sagging of the support. In another embodiment, the assembly may be at least partially elastic. In yet another embodiment, a strain gauge may be employed to detect stretching of the assembly due to sagging of the support. In the method of the invention, a signal received from the sensor may be employed either with or without a processor to activate an alarm or to activate a light or to activate another audible signal or to send a signal over a telephone line. In addition, the signal received may be used to activate or deactivate a brake on a wheelchair.
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Cherubini Julian H.
Drake Jesse
AliMed, Inc.
Santos Robert G
Wolf Greenfield & Sacks P.C.
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