Patent ID: 7150056
Filing Date: 2006-12-19
Classification: A61G

Abstract:
1. A frame elevating mechanism, comprising: a first frame configured to be supported on a floor surface, said first frame including a pair of first frame side rails extending between a head end and a foot end of said first frame, said first frame including at least a pair of secondary frame rails connected to and extending between said pair of first frame side rails; a second frame oriented above said first frame, said second frame including a pair of second frame side rails extending between a head end and a foot end of said second frame, said second frame side rails each having a pair of longitudinally spaced first elongate guide tracks thereon which extend coextensively with said second frame side rails; a pair of first and second longitudinally spaced elongate lever arms pivotally supported at a first end thereof on each of said first frame side rails, a second end of each elongate lever arm having a first follower member operatively coupled to a respective said first elongate guide track and configured to be guided along a length of each respective first elongate guide track in response to elevation changes between said first and second frames, each of said first and second lever arms having a second elongate guide track thereon; a pair of first and second longitudinally spaced two arm levers pivotally secured to and extending between each of said first frame side rails, a first arm of each of said two arm levers having a second follower member operatively coupled to a respective said second elongate guide track and configured to be guided along a length of each respective second elongate guide track in response to elevation changes between said first and second frames; an elongate link pivotally connected at opposite ends to and extending between one of said first and second lever arms and said second frame side rail; a pair of longitudinally spaced drive mechanisms each mounted on a respective one of said secondary frame rails, each drive mechanism having an output member that is movable toward and away from said drive mechanism, each output member being pivotally secured to a respective said second arm of said two arm lever.