Support force adjustment assembly and chair

Abstract

A support force adjustment assembly includes: a frame, a first tensioning member, a second tensioning member, a flexible support member, and an adjustment mechanism. The first tensioning member and the second tensioning member are oppositely arranged on both sides of the frame. The adjustment mechanism is movably connected to the frame. A first end of the flexible member is secured to the first tensioning member, and a second end of the flexible support member passes around the second tensioning member and is secured to the adjustment mechanism. The adjustment mechanism is configured to, in response to moving relative to the frame, drive the flexible support member to deform to adjust the support force supplied by the flexible support member. The adjustment mechanism is further configured to, in response to being secured relative to the frame, maintain a deformed state of the flexible support member.

What is claimed is: 
     
         1 . A support force adjustment assembly, applicable to a chair, comprising:
 a frame;   a first tensioning member and a second tensioning member, wherein the first tensioning member and the second tensioning member are oppositely arranged on both sides of the frame;   an adjustment mechanism, movably connected to the frame; and   a flexible support member, wherein a first end of the flexible member is secured to the first tensioning member, and a second end of the flexible support member passes around the second tensioning member and is secured to the adjustment mechanism;   wherein a portion, positioned between the first tensioning member and the second tensioning member, of the flexible support member is configured to supply a support force; the adjustment mechanism is configured to, in response to moving relative to the frame, drive the flexible support member to deform to adjust the support force supplied by the flexible support member; and the adjustment mechanism is further configured to, in response to being secured relative to the frame, maintain a deformed state of the flexible support member.   
     
     
         2 . The support force adjustment assembly according to  claim 1 , wherein the adjustment mechanism comprises a rotation rod, wherein the rotation rod is rotatably connected to the frame, and the flexible support member is securely connected to the rotation rod;
 wherein the rotation rod is configured to, in response to rotating, wind the flexible support member around the rotation rod or release the flexible support member wound around the rotation rod to allow the flexible support member to be tightened or loosened.   
     
     
         3 . The support force adjustment assembly according to  claim 2 , wherein the adjustment mechanism further comprises a drive member, wherein the drive member is secured to the frame, and an output shaft of the drive member is securely connected to the rotation rod to drive the rotation rod to rotate. 
     
     
         4 . The support force adjustment assembly according to  claim 2 , wherein the adjustment mechanism further comprises a drive shaft, wherein the drive shaft is secured to the frame, a worm is arranged on the drive shaft, a worm gear is arranged on the rotation rod, and the drive shaft and the rotation rod are engaged in transmission via the worm and the worm gear, such that the drive shaft drives the rotation rod to rotate during rotation. 
     
     
         5 . The support force adjustment assembly according to  claim 4 , wherein
 a limiting chamber is arranged in the frame, wherein a limiting block is arranged in the limiting chamber, the drive shaft is inserted through the limiting chamber and is engaged with threads of the limiting block at a portion of the limiting chamber where the drive shaft is positioned, and the limiting block is configured to move with rotation of the drive shaft and restrict rotation of the drive shaft in response to moving to abut against an inner wall of the limiting chamber; and/or   a first protrusion is arranged on a side wall of the rotation rod, and a second protrusion is arranged on the frame, wherein the second protrusion is configured to be abutted against the first protrusion with respect to outer walls on both sides thereof in response to rotation of the rotation rod, to restrict a rotation stroke of the rotation rod.   
     
     
         6 . The support force adjustment assembly according to  claim 4 , wherein a first end of the drive shaft protrudes from the frame to form a force-receiving portion, an accommodation recess around the force-receiving portion is arranged in the frame, and a handle is rotatably connected to the force-receiving portion; wherein
 the handle is configured to, in response to rotating to be parallel with the drive shaft, at least partially protrudes from the accommodation recess, and receive a force and drive the drive shaft to rotate; and   the handle is further configured to, in response to rotating to be perpendicular to the drive shaft, be at least partially accommodated in the accommodation recess.   
     
     
         7 . The support force adjustment assembly according to  claim 1 , wherein the adjustment mechanism comprises a slide rod, wherein the slide rod is slidably connected to the frame, and the flexible support member is securely connected to the slide rod;
 wherein the slide rod is configured to, in response to sliding relative to the frame, drive the flexible support member to stretch or contract.   
     
     
         8 . The support force adjustment assembly according to  claim 7 , wherein the adjustment mechanism comprises a camshaft and a cam, wherein the camshaft is rotatably connected to the frame, the cam is fitted and secured to the camshaft, and an outer edge of the cam is abutted against a side face of the slide rod;
 wherein the cam is configured to, in response to rotating with the camshaft, drive the slide rod to slide within a predetermined range.   
     
     
         9 . The support force adjustment assembly according to  claim 1 , further comprising a first mesh fabric, wherein the first mesh fabric is securely capped over a front face of the frame;
 wherein the first tensioning member and the second tensioning member are oppositely arranged on inner edges of the frame, and the flexible support member is arranged on a back face of the first mesh fabric.   
     
     
         10 . The support force adjustment assembly according to  claim 1 , wherein the flexible support member comprises one or more a second mesh fabric, an elastic sheet, an elastic band, or an elastic rod. 
     
     
         11 . A chair, comprising a support force adjustment assembly, wherein the support force adjustment assembly comprises:
 a frame;   a first tensioning member and a second tensioning member, wherein the first tensioning member and the second tensioning member are oppositely arranged on both sides of the frame;   an adjustment mechanism, movably connected to the frame; and   a flexible support member, wherein a first end of the flexible member is secured to the first tensioning member, and a second end of the flexible support member passes around the second tensioning member and is secured to the adjustment mechanism;   wherein a portion, positioned between the first tensioning member and the second tensioning member, of the flexible support member is configured to supply a support force; the adjustment mechanism is configured to, in response to moving relative to the frame, drive the flexible support member to deform to adjust the support force supplied by the flexible support member; and the adjustment mechanism is further configured to, in response to being secured relative to the frame, maintain a deformed state of the flexible support member.   
     
     
         12 . The chair according to  claim 11 , wherein the adjustment mechanism comprises a rotation rod, wherein the rotation rod is rotatably connected to the frame, and the flexible support member is securely connected to the rotation rod;
 wherein the rotation rod is configured to, in response to rotating, wind the flexible support member around the rotation rod or release the flexible support member wound around the rotation rod to allow the flexible support member to be tightened or loosened.   
     
     
         13 . The chair according to  claim 12 , wherein the adjustment mechanism further comprises a drive member, wherein the drive member is secured to the frame, and an output shaft of the drive member is securely connected to the rotation rod to drive the rotation rod to rotate. 
     
     
         14 . The chair according to  claim 12 , wherein the adjustment mechanism further comprises a drive shaft, wherein the drive shaft is secured to the frame, a worm is arranged on the drive shaft, a worm gear is arranged on the rotation rod, and the drive shaft and the rotation rod are engaged in transmission via the worm and the worm gear, such that the drive shaft drives the rotation rod to rotate during rotation. 
     
     
         15 . The chair according to  claim 14 , wherein
 a limiting chamber is arranged in the frame, wherein a limiting block is arranged in the limiting chamber, the drive shaft is inserted through the limiting chamber and is engaged with threads of the limiting block at a portion of the limiting chamber where the drive shaft is positioned, and the limiting block is configured to move with rotation of the drive shaft and restrict rotation of the drive shaft in response to moving to abut against an inner wall of the limiting chamber; and/or   a first protrusion is arranged on a side wall of the rotation rod, and a second protrusion is arranged on the frame, wherein the second protrusion is configured to be abutted against the first protrusion with respect to outer walls on both sides thereof in response to rotation of the rotation rod, to restrict a rotation stroke of the rotation rod.   
     
     
         16 . The chair according to  claim 14 , wherein a first end of the drive shaft protrudes from the frame to form a force-receiving portion, an accommodation recess around the force-receiving portion is arranged in the frame, and a handle is rotatably connected to the force-receiving portion; wherein
 the handle is configured to, in response to rotating to be parallel with the drive shaft, at least partially protrudes from the accommodation recess, and receive a force and drive the drive shaft to rotate; and   the handle is further configured to, in response to rotating to be perpendicular to the drive shaft, be at least partially accommodated in the accommodation recess.   
     
     
         17 . The chair according to  claim 11 , wherein the adjustment mechanism comprises a slide rod, wherein the slide rod is slidably connected to the frame, and the flexible support member is securely connected to the slide rod;
 wherein the slide rod is configured to, in response to sliding relative to the frame, drive the flexible support member to stretch or contract.   
     
     
         18 . The chair according to  claim 17 , wherein the adjustment mechanism comprises a camshaft and a cam, wherein the camshaft is rotatably connected to the frame, the cam is fitted and secured to the camshaft, and an outer edge of the cam is abutted against a side face of the slide rod;
 wherein the cam is configured to, in response to rotating with the camshaft, drive the slide rod to slide within a predetermined range.   
     
     
         19 . The chair according to  claim 11 , further comprising a first mesh fabric, wherein the first mesh fabric is securely capped over a front face of the frame;
 wherein the first tensioning member and the second tensioning member are oppositely arranged on inner edges of the frame, and the flexible support member is arranged on a back face of the first mesh fabric.   
     
     
         20 . The chair according to  claim 11 , wherein the flexible support member comprises one or more a second mesh fabric, an elastic sheet, an elastic band, or an elastic rod.