Developed seating comfort wall-proximity mechanisms

Abstract

The invention relates to a multi-link lift chair frame for a lift chair, which has a reasonable structural and multifunctional design, is highly reliable, and is capable of implementing a lying position, a relaxing position and a sitting position of a lift chair seat. The multi-link lift chair frame includes a deployment mechanism, a footrest mechanism, a backrest mechanism, a mounting and locating mechanism, a support mechanism, and a limit mechanism. Through adjusting the footrest mechanism, the backrest mechanism, the mounting and locating mechanism, and the support mechanism in the lift chair, the lift chair is adjusted among three positions: the lying position, the relaxing position and the sitting position, implementing multiple functions on one lift chair. More demanding requirements on a lift chair are met, and costumers can purchase less lift chairs or chairs of different positions, thereby reducing the cost.

What is claimed is: 
     
         1 . A multi-link lift chair frame, comprising:
 a deployment mechanism;   a footrest mechanism;   a backrest mechanism;   a mounting and locating mechanism;   a support mechanism; and   a limit mechanism,   wherein the deployment mechanism comprises a first link, a second link, a third link, a fourth link, a fifth link, a sixth link, a seventh link, an eighth link, and a spindle drive rod;   wherein the footrest mechanism comprises a first leg rod, a second leg rod, a third leg rod, a fourth leg rod, a foot board support, and a foot rest board;   wherein the backrest mechanism comprises a back protection plate and a back member that are L-shaped;   wherein the mounting and locating mechanism comprises an L-shaped connecting plate, a mounting plate and a locating plate;   wherein the support mechanism comprises a first support rod, a second support rod, and a base;   wherein the second leg rod is provided with a first limit surface and a second limit surface, the spindle drive rod is provided with a third limit surface, the back protection plate is provided with a fourth limit surface, the second support rod is provided with a fifth limit surface, the eighth link is provided with a sixth limit surface, and the fourth leg rod is provided with a seventh limit surface;   wherein the foot rest board is connected to an end of the first leg rod and an end of the second leg rod in a rotating manner through a spindle, the foot board support is connected to the first leg rod and the second leg rod in a rotating manner through a spindle, the third leg rod is respectively to the first leg rod and the back protection plate in a rotating manner through a spindle; the fourth leg rod is connected to the second leg rod, the second link, the third link, and the back protection plate in a rotating manner through a spindle;   wherein the sixth link is respectively connected to the back protection plate, the spindle drive rod, and the first support rod in a rotating manner through a spindle; the fourth link is connected to the second link in a rotating manner through a spindle; the seventh link is connected to the first support rod, the first link, and the fifth link in a rotating manner through a spindle; the third link is connected to the fifth link in a rotating manner through a spindle, an end of the first support rod is connected to the base in a rotating manner through a spindle; the first link is connected to the back protection plate, the fifth link, and the seventh link in a rotating manner through a spindle, the back protection plate is connected to the L-shaped connecting plate, the back member, the spindle drive rod, and the first link in a rotating manner through a spindle, the eighth link is connected to the back member and the L-shaped connecting plate in a rotating manner through a spindle;   wherein an end of the second support rod is connected to the connecting plate in a rotating manner through a spindle, and another end thereof is connected to the base in a rotating manner through a spindle; the mounting plate is connected to the back protection plate through a rivet; and   wherein the locating plate is connected to the back protection plate, the spindle drive rod, the second link, and the first support rod in a rotating manner through a spindle.   
     
     
         2 . The multi-link lift chair frame according to  claim 1 , wherein when the multi-link lift chair frame is in a sitting position, an included angle between the back member and a floor is about 62°±2°;
 wherein when the multi-link lift chair frame is in a lying position, an included angle between the back member and a floor is about 30°±2°; and 
 wherein when the multi-link lift chair frame is in a relaxing position, an included angle between the back member and a floor is about 57°±2°. 
 
     
     
         3 . The multi-link lift chair frame according to  claim 1 , wherein a distance between mounting holes at two ends of the second support rod is about 186.4 mm. 
     
     
         4 . A lift chair, comprising the multi-link lift chair frame as claimed in  claim 1 .