Patent ID: 6851144
Filing Date: 2005-02-08
Classification: A61G

Abstract:
1. A power-controlled bed comprising: a mattress divided into a movable back rest part, a fixed hip rest part, and movable thigh and leg rest parts that are connected to each other; an upper bed frame supporting said mattress; at least one set of lifting mechanisms for moving said upper bed frame into different horizontal and inclined positions; at least one set of crank pivoting device for reciprocatingly translating said upper bed frame forward and backward; a lower bed frame supporting said at least one set of lifting mechanisms and said at least one set of crank pivoting device; and a microcomputer controller for controlling operations of said bed; said at least one set of lifting mechanisms including: two pairs of upper and lower cranks, each single pair of said upper and lower cranks being connected at inner ends to each other via a first pivot joint, and at outer ends to predetermined points on said upper and said lower bed frames, respectively, via second pivot joints; an upper and a lower crossbar extended between and are connected to each of said two pairs of upper and lower cranks; and a threaded-rod elevator connected to and between said upper and said lower crossbars for moving said upper and said lower crossbars up or down and thereby pushing or pulling said upper cranks away from or toward said lower cranks, respectively, causing said upper bed frame pivotally connected to said upper cranks to ascend or descend; and said at least one set of crank pivoting device being connected to a bottom crossbar provided below one of said lower crossbars to extend between a pair of said lower cranks located at one end below said upper bed frame, and including a motor that rotates an eccentric wheel to thereby push and pull a pivoting crank connected to said bottom crossbar, so that said bottom crossbar is forced to reciprocatingly move forward and backward within a range of movement of said lower cranks and thereby causes said upper bed frame to reciprocatingly translate and swing forward and backward.