Seat back plate adjustment device

Abstract

A seat back plate adjustment device includes a connection mechanism sleeved on a seat base lifting cylinder, a swinging mechanism fixedly provided on the connection mechanism and an adjustment mechanism penetrating the connection mechanism; the swinging mechanism includes a spring support fixedly provided on the connection mechanism, two swinging springs symmetrically set about a center line of the spring support, an insertion plate and a rotating shaft pressed against the swinging springs; the rotating shaft runs through the insertion plate and the spring support, the insertion plate is rotatably connected with the spring support, and the insertion plate is fixedly connected to the back plate of the seat. The invention has the advantages of good sitting comfort and good support stability.

1 . A seat back plate adjustment device, including a connection mechanism sleeved on a seat base lifting cylinder, a swinging mechanism fixedly provided on the connection mechanism and an adjustment mechanism penetrating the connection mechanism; the swinging mechanism includes a spring support fixedly provided on the connection mechanism, two swinging springs symmetrically set about a center line of the spring support, an insertion plate and a rotating shaft abutted against the swinging springs;
 the rotating shaft runs through the insertion plate and the spring support, the insertion plate is rotatably connected with the spring support, and the insertion plate is fixedly connected to the back plate of the seat.   
     
     
         2 . The seat back plate adjustment device of  claim 1 , wherein the insertion plate includes a positioning plate, extension plates symmetrically connected to both sides of the positioning plate, and two support plates vertically disposed on the positioning plate; the positioning plate is provided with threaded holes, and the support plate is provided with shaft holes, and the rotating shaft is threaded on the support plate. 
     
     
         3 . The seat back plate adjustment device of  claim 2 , wherein the positioning plate is symmetrically provided with two limiting bumps, and the limiting bumps are inserted in the swinging springs. 
     
     
         4 . The seat back plate adjustment device of  claim 2 , wherein gaskets are provided in the shaft hole on the support plate; the gaskets are sleeved on the rotating shaft. 
     
     
         5 . The seat back plate adjustment device of  claim 1 , wherein a side wall on the spring support corresponding to the position where the swinging springs are abutted against protrudes outward to form protrusions; the swinging springs are snap-fitted within the protrusions. 
     
     
         6 . The seat back plate adjustment device of  claim 1 , wherein the connection mechanism includes a base plate fixedly connected to the seat, a cover plate fixedly provided on the base plate and sleeved on the seat base lifting cylinder, and a screw penetrating the base plate and cover plate; one end of the screw is provided with an end block, and another end is provided with a threaded hole. 
     
     
         7 . The seat back plate adjustment device of  claim 6 , wherein the cover plate is provided with a mounting cylinder, an inner wall of the mounting cylinder is provided with threads, and the diameter size of the mounting cylinder gradually increases along the direction away from the cover plate. 
     
     
         8 . The seat back plate adjustment device of  claim 6 , wherein a plurality of reinforcing bars is provided on partial sidewall of the cover plate that is sleeved on the seat base lifting cylinder, and the reinforcing bars are uniformly distributed along circumferential direction of the seat base lifting cylinder. 
     
     
         9 . The seat back plate adjustment device of  claim 6 , wherein the adjustment mechanism includes an adjusting rod penetrating the base plate and the cover plate and a fixture block fixed in the base plate; the adjusting rod is slidably connected with the base plate and the cover plate in the direction of its own axis. 
     
     
         10 . The seat back plate adjustment device of  claim 9 , wherein a flat head is provided at one end of the adjusting rod away from the base plate.