Lumbar support stretching device suitable for seat, lumbar support and seat

Abstract

The present disclosure relates to the field of design and manufacturing of seats. The present disclosure is achieved through the following technical solution: a lumbar support stretching device suitable for a seat includes a backrest frame, and further includes a pneumatic assembly installed on the backrest frame and an X frame connected thereto, the X frame stretches and retracts along a horizontal front-rear direction while the pneumatic assembly moves. The objective of the present disclosure is to provide a lumbar support stretching device suitable for a seat, a lumbar support and the seat to overcome defects in the prior art. When a user moves back and forth on the seat, the lumbar support is configured to move in synchronization with the user while maintaining a close fit to the lumbar and back region of the human body.

What is claimed is: 
     
         1 . A lumbar support stretching device suitable for a seat, comprising a backrest frame, wherein the lumbar support stretching device further comprises a pneumatic assembly installed on the backrest frame and an X frame connected with the pneumatic assembly, the X frame stretches and retracts along a horizontal back-and-forth direction while the pneumatic assembly moves, which provides stable and uniform support force for a lumbar and back region of a human body. 
     
     
         2 . The lumbar support stretching device suitable for the seat according to  claim 1 , wherein the pneumatic assembly comprises a cylinder installed on the backrest frame and a piston rod connected with the cylinder, and the piston rod is connected with the X frame. 
     
     
         3 . The lumbar support stretching device suitable for the seat according to  claim 2 , wherein the X frame comprises a first frame and a second frame, wherein the first frame is articulated with the second frame, the first frame is in sliding connection with the backrest frame, the second frame is articulated with the backrest frame, a slide frame is connected to the piston rod, and the slide frame is connected with the first frame. 
     
     
         4 . The lumbar support stretching device suitable for the seat according to  claim 3 , wherein the backrest frame stretches in a vertical direction, the backrest frame further comprises a limiting slot stretching in the vertical direction, and the first frame comprises a sliding axle which slides in the limiting slot in the vertical direction. 
     
     
         5 . The lumbar support stretching device suitable for the seat according to  claim 3 , wherein the slide frame comprises a connecting rod plate connected with the piston rod and side connecting frames connected with the connecting rod plate, and the side connecting frames are connected with the first frame. 
     
     
         6 . The lumbar support stretching device suitable for the seat according to  claim 5 , wherein the two side connecting frames are provided, which are positioned on two sides of the pneumatic assembly, and a spacing between the two side connecting frames gradually gets larger towards a direction of getting close to the cylinder vertically. 
     
     
         7 . The lumbar support stretching device suitable for the seat according to  claim 3 , wherein the lumbar support stretching device further comprises minor springs, one end of the minor spring is connected to the backrest frame, while the other end is connected to the slide frame. 
     
     
         8 . The lumbar support stretching device suitable for the seat according to  claim 7 , wherein both the minor springs and the piston rod stretch in a vertical direction, the minor springs are positioned on one side of the slide frame in the vertical direction, and the piston rod is positioned on the other side of the slide frame in the vertical direction. 
     
     
         9 . The lumbar support stretching device suitable for the seat according to  claim 2 , wherein a switch configured to control the pneumatic assembly that is running to be turned off is arranged on the piston rod, and the lumbar support stretching device further comprises an operation device configured to operate and control the switch. 
     
     
         10 . The lumbar support stretching device suitable for the seat according to  claim 9 , wherein the operation device comprises a pull rope, a central fixing plate articulated with the X frame, and a rope connecting hook connected with the central fixing plate, the pull rope is connected to the rope connecting hook, and the central fixing plate is configured to abut against the switch. 
     
     
         11 . The lumbar support stretching device suitable for the seat according to  claim 10 , wherein the rope connecting hook, the piston rod, and the cylinder are sequentially arranged from top to bottom in a vertical direction. 
     
     
         12 . The lumbar support stretching device suitable for the seat according to  claim 11 , wherein a rope passing slot for allowing the pull rope to pass through is formed in the rope connecting hook. 
     
     
         13 . The lumbar support stretching device suitable for the seat according to  claim 12 , wherein the central fixing plate is connected to the piston rod, and a rope fixing hole for allowing the pull rope to pass through is formed in the central fixing plate. 
     
     
         14 . The lumbar support stretching device suitable for the seat according to  claim 3 , wherein the first frame comprises a first abut-against column stretching in a horizontal direction, and connecting and support sheets which are pivotable in a vertical direction are connected to the first abut-against column. 
     
     
         15 . The lumbar support stretching device suitable for the seat according to  claim 14 , wherein the second frame comprises a second abut-against column stretching in the horizontal direction. 
     
     
         16 . A lumbar support, comprising a lumbar support body and the lumbar support stretching device as claimed in  claim 1 , wherein the lumbar support body is connected with the X frame. 
     
     
         17 . A seat, comprising seat legs, a seat frame, and a seat stool which is connected with the seat frame, and further comprising the lumbar support as claimed in  claim 16 , wherein the seat frame is connected with the backrest frame.