Seat lumbar adjustment device

Abstract

Provided is a seat lumbar adjustment device, which solves the technical problem that some existing seats cannot consistently conform to a user's lower back, reducing user comfort. The seat lumbar adjustment device includes: a first force-bearing plate; two first force-bearing rods, one end of each of the two first force-bearing rods being hingedly connected to the first force-bearing plate; a second force-bearing plate; two first force-bearing blocks, which are correspondingly and rotatably provided at the ends of the two first force-bearing rods close to the first force-bearing plate; a first connecting shaft, which is rotatably provided between the two first force-bearing blocks; a second force-bearing block, which is fixedly provided at one end of the first force-bearing plate; and a gas strut, one end of the gas strut being rotatably connected to the first connecting shaft.

What is claimed is: 
     
         1 . A seat lumbar adjustment device, comprising:
 a first force-bearing plate ( 13 );   two first force-bearing rods ( 22 ), one end of each of the two first force-bearing rods ( 22 ) being hinged to the first force-bearing plate ( 13 );   a second force-bearing plate ( 18 ), wherein the second force-bearing plate ( 18 ) is opposite the first force-bearing plate ( 13 ), and the other end of each of the two first force-bearing rods ( 22 ) are slidably and rotatably connected to the second force-bearing plate ( 18 );   two second force-bearing rods ( 15 ), wherein one end of each of the two second force-bearing rods ( 15 ) is hinged to the second force-bearing plate ( 18 ), and the other end of each of the two second force-bearing rods ( 15 ) is slidably and rotatably connected to the first force-bearing plate ( 13 );   two first force-bearing blocks ( 29 ), which are correspondingly and rotatably provided at the ends of the two first force-bearing rods ( 22 ) close to the first force-bearing plate ( 13 );   a first connecting shaft ( 26 ), which is rotatably provided between the two first force-bearing blocks ( 29 ) and is rotatably connected to the ends of the two second force-bearing rods ( 15 ) close to the first force-bearing plate ( 13 );   a second force-bearing block ( 35 ), which is fixedly provided at one end of the first force-bearing plate ( 13 );   a gas strut ( 24 ), one end of the gas strut ( 24 ) being rotatably connected to the first connecting shaft ( 26 ), and the other end of the gas strut ( 24 ) being fixedly connected to the second force-bearing block ( 35 );   and a sixth connecting shaft ( 14 ), which is rotatably connected to the first force-bearing rod ( 22 ) and the second force-bearing rod ( 15 ) on the same side.   
     
     
         2 . The seat lumbar adjustment device according to  claim 1 , wherein the first force-bearing plate ( 13 ) is U-shaped; first limiting slots ( 41 ) are symmetrically provided on and extend through two side surfaces of the first force-bearing plate ( 13 ); and the first connecting shaft ( 26 ) passes through the two first limiting slots ( 41 ) and is configured to reciprocate along the length direction of the first limiting slots ( 41 ). 
     
     
         3 . The seat lumbar adjustment device according to  claim 1 , wherein two third force-bearing blocks ( 16 ) are fixedly provided at the end of the second force-bearing plate ( 18 ) close to the first force-bearing plate ( 13 ); a second connecting shaft ( 17 ) is rotatably provided on each of the third force-bearing blocks ( 16 ), and the second force-bearing rods ( 15 ) are fixedly connected to the corresponding second connecting shafts ( 17 ); second limiting slots ( 30 ) are symmetrically provided on and extend through two side surfaces of the first force-bearing plate ( 13 ); and a third connecting shaft ( 28 ) is fixedly provided at the other end of each of the second force-bearing rods ( 15 ), the third connecting shaft ( 28 ) being slidably provided in the corresponding second limiting slot ( 30 ). 
     
     
         4 . The seat lumbar adjustment device according to  claim 1 , wherein a fourth connecting shaft ( 12 ) is fixedly provided at the end of each of the two first force-bearing rods ( 22 ) close to the first force-bearing plate ( 13 ), and each of the fourth connecting shafts ( 12 ) is rotatably connected to the first force-bearing plate ( 13 ); two symmetrical fourth force-bearing blocks ( 20 ) are fixedly provided at the end of the second force-bearing plate ( 18 ) close to the first force-bearing plate ( 13 ), and a third limiting slot ( 21 ) is provided on and extends through each of the fourth force-bearing blocks ( 20 ); a fifth connecting shaft ( 19 ) is fixedly provided at the end of each of the first force-bearing rods ( 22 ) close to the second force-bearing plate ( 18 ), the fifth connecting shaft ( 19 ) being slidably provided in the third limiting slot ( 21 ). 
     
     
         5 . The seat lumbar adjustment device according to  claim 1 , wherein a connecting plate ( 23 ) is fixedly provided between the two second force-bearing rods ( 15 ). 
     
     
         6 . The seat lumbar adjustment device according to  claim 2 , wherein a fifth force-bearing block ( 25 ) is fixedly provided at a fixed end of the gas strut ( 24 ), the fifth force-bearing block ( 25 ) being fixed to the first connecting shaft ( 26 ); a telescopic end of the gas strut ( 24 ) is provided with threads and is threadedly connected to a nut ( 42 ) that abuts against the second force-bearing block ( 35 ); the end of the telescopic end of the gas strut ( 24 ) passing through the second force-bearing block ( 35 ) is threadedly connected to a sixth force-bearing block ( 33 ); a valve ( 34 ) is provided on the telescopic end of the gas strut ( 24 ); and a mounting slot ( 40 ) is provided on and extend through the first force-bearing plate ( 13 ). 
     
     
         7 . The seat lumbar adjustment device according to  claim 6 , wherein a seventh connecting shaft ( 39 ) is fixedly provided on the sixth force-bearing block ( 33 ), a paddle ( 37 ) is rotatably provided on the seventh connecting shaft ( 39 ), a third force-bearing rod ( 38 ) passes through the other end of the paddle ( 37 ), and a pull rope ( 32 ) is fixedly provided on the third force-bearing rod ( 38 ). 
     
     
         8 . The seat lumbar adjustment device according to  claim 7 , wherein a limiting sleeve ( 31 ) is threadedly and rotatably connected to the sixth force-bearing block ( 33 ), the pull rope ( 32 ) passes through the limiting sleeve ( 31 ), an extension spring ( 36 ) is connected between the paddle ( 37 ) and the sixth force-bearing block ( 33 ), and the pull rope ( 32 ) passes through the extension spring ( 36 ). 
     
     
         9 . The seat lumbar adjustment device according to  claim 1 , wherein two seventh force-bearing blocks ( 11 ) are fixedly provided on the first force-bearing plate ( 13 ), and a force-bearing spring ( 10 ) is provided between each of the seventh force-bearing blocks ( 11 ) and the first connecting shaft ( 26 ). 
     
     
         10 . The seat lumbar adjustment device according to  claim 1 , further comprising two transmission blocks ( 27 ), wherein the first connecting shaft ( 26 ) and the third connecting shaft ( 28 ) are rotatably provided between the two transmission blocks ( 27 ), and the two transmission blocks ( 27 ) are attached to two sides of the first force-bearing plate ( 13 ).