Adaptable swing assembly for chair back tilt, chair back tilt locking mechanism and chassis

Abstract

The present invention provides an adaptive swing component for chair back reclining, a chair back reclining locking mechanism and a chassis, wherein the adaptive swing component comprises a main shaft and a motion assembly, wherein the motion assembly comprises a first moving member, a track seat and a second moving member which rotate synchronously around the main shaft; the chair back reclining locking mechanism comprises the above-mentioned adaptive swing component, which has an adjustment state and a locking state, wherein in the adjustment state, the first moving member is disengaged from the second moving member, the chair back can rotate and drive the first moving member to move in the adjustment direction and rotate relative to the main shaft; and the locking mechanism is applied to the chassis; in the locking state, the first moving member is combined and locked with the second moving member to lock the current reclining angle of the chair back; the entire motion assembly is interlocked and rotates together relative to the main shaft to realize adaptive swinging and prevent motion interference and jamming; the structural locking can solve the problems of friction plate wear and failure, noise, etc., and the operation is easier, the structure is simple, and the cost is maintained at a low level.

What is claimed is: 
     
         1 . An adaptive swing assembly for chair back reclining, comprising:
 a main shaft and a motion assembly,   wherein:   the motion assembly is rotatably arranged on the main shaft and swings on the main shaft;   the motion assembly comprises a track seat and a first moving member and a second moving member arranged on the track seat, the track seat comprises a first sliding track and a second sliding track that are perpendicular to each other, the first moving member and the second moving member slide in the first sliding track and the second sliding track, respectively;   the first moving member and the first sliding track are attached to the first moving member and can rotate synchronously with the track seat relative to the main shaft;   the second moving member and the second sliding track are attached to the second moving member and can rotate synchronously with the track seat relative to the main shaft;   the first moving member or the second moving member is sleeved on the main shaft and is rotatably connected to the main shaft.   
     
     
         2 . The adaptive swing assembly according to  claim 1 , wherein: the track seat is slotted through to form a first sliding track, the first moving member has a first limiting surface and a second limiting surface, the first limiting surface is in contact with an upper groove wall of the first sliding track, and the second limiting surface is in contact with a lower groove wall of the first sliding track. 
     
     
         3 . The adaptive swing assembly according to  claim 2 , wherein: the main shaft is arranged along a left and right direction, the second sliding track is arranged along the left and right direction, the second moving member is sleeved on the main shaft, the track seat is sleeved on the second moving member and the second moving member is slidably arranged in the second sliding track. 
     
     
         4 . A chair back reclining locking mechanism comprising:
 an adaptive swinging assembly according to  claim 1 ;   an adjustment direction and a locking direction, wherein the adjustment direction coincides with the first sliding track, and the locking direction coincides with the second sliding track, the first moving member moves in the adjustment direction as the chair back rotates, the second moving member moves in the locking direction, and locks the first moving member when the second moving member approaches the first moving member or unlocks the first moving member when the second moving member leaves the first moving member;   an adjustment state and a locking state, wherein in the adjustment state, the first moving member is disengaged from the second moving member, the chair back rotates and drives the first moving member to move in the adjustment direction and rotates relative to the main axis; in the locking state, the first moving member and the second moving member are combined and locked to lock a current reclining angle of the chair back.   
     
     
         5 . The chair back reclining locking mechanism according to  claim 4 , wherein: in the adjustment state, when the chair back rotates, the adjustment direction tilts with the swing of the motion assembly. 
     
     
         6 . The chair back reclining locking mechanism according to  claim 4 , wherein an axial direction of the main shaft coincides with the locking direction, and the second moving member is sleeved on the main shaft and slidably cooperates with the main shaft in the second sliding track. 
     
     
         7 . The chair back reclining locking mechanism according to  claim 6 , wherein the main shaft is a metal part. 
     
     
         8 . The chair back reclining locking mechanism according to  claim 7 , wherein: the second moving member is a metal part, the second moving member comprises a locking part and a sliding part, the sliding part is arranged in the second sliding track and fits with the second sliding track, and the locking part is configured to lock with the first moving member when the locking part is close to the first moving member; the locking part and the sliding part are integrally formed. 
     
     
         9 . The chair back reclining locking mechanism according to  claim 7 , wherein: the second moving member comprises a locking part and a sliding part, the sliding part is arranged in the second sliding track and fits with the second sliding track, and the locking part is configured to lock with the first moving member when the locking part is close to the first moving member; the locking part and the sliding part are spliced together, and the locking part is a metal part, and the sliding part is a plastic part. 
     
     
         10 . The chair back reclining locking mechanism according to  claim 4 , wherein: the first moving member is provided with a receiving groove in the locking direction, and the receiving groove extends along a length direction of the first moving member; an inner tooth portion is provided in the receiving groove, and an outer tooth portion is provided on the second moving member; in the locked state, the first moving member enters the receiving groove and the first moving member and the second moving member are locked by meshing the inner tooth portion with the outer tooth portion. 
     
     
         11 . The chair back reclining locking mechanism according to  claim 4 , wherein the track seat is composed of two left-right symmetrical track parts. 
     
     
         12 . A chassis comprising: a base, a chair back connecting member and the chair back reclining locking mechanism as described in  claim 4 , wherein the chair back reclining locking mechanism is rotatably arranged on the base, the main shaft is arranged on the base along left and right directions, a linkage member is provided between the chair back reclining locking mechanism and the chair back connecting member, and the linkage member is configured so that when the chair back connecting member rotates relative to the base, the motion assembly rotates on the main shaft; when the chair back reclining locking mechanism is in the adjustment state, the chair back connecting member can rotate relative to the base; when the chair back reclining locking mechanism is in the locked state, the chair back reclining locking mechanism locks the rotation between the chair back connecting member and the base, and makes the chair back connecting member stay in the rotated position. 
     
     
         13 . The chassis according to  claim 12 , wherein the base has a mounting groove, the mounting groove opens upward, and the chair back reclining locking mechanism is arranged in the mounting groove. 
     
     
         14 . The chassis according to  claim 12 , further comprising an operating rod, which is inserted into the base along the left-right direction, and a transmission member being provided between the operating rod and the second moving member; wherein the operating rod is configured to pull the operating rod to drive the transmission member to move, and the transmission member drives the second moving member to slide in the second sliding track, and switches the chair back reclining locking mechanism between the adjustment state and the locking state. 
     
     
         15 . The chassis according to  claim 14 , wherein: the transmission member is a torsion spring, which is rotatably arranged on the base, and two ends of the torsion spring are respectively connected to the operating rod and the second moving member. 
     
     
         16 . The chassis according to  claim 15 , wherein: an avoidance groove extending along the locking direction is provided on the track seat outside the second moving member, and a slot is provided on the second moving member, and a torsion spring arm at one end of the torsion spring is inserted into the slot through the avoidance groove; the avoidance groove is configured so that when the operating rod is pulled, the torsion spring drives the second moving member to move in the second sliding track, and the avoidance groove avoids the movement of the torsion spring arm. 
     
     
         17 . The chassis according to  claim 12 , wherein: the linkage member is a connecting pin, the connecting pin is inserted into the first moving member and the chair back connecting member, the first moving member and the chair back connecting member are rotatably connected through the connecting pin. 
     
     
         18 . The chassis according to  claim 12 , wherein: the linkage member comprises a seat connector, a connecting pin and a rotating sliding shaft, the seat connector is rotatably arranged on the base, the connecting pin penetrates through the seat connector and the first moving member, the first moving member and the seat connector are rotatably connected through the connecting pin; the rotating sliding shaft is arranged on the seat connector, a sliding groove is provided on the chair back connecting member, the rotating sliding shaft is inserted in the sliding groove, the rotating sliding shaft and the sliding groove are configured to link the chair back connecting member with the seat connector, and when the chair back connecting member rotates relative to the base, the seat connector is driven to rotate relative to the base. 
     
     
         19 . The chassis according to  claim 12 , wherein: the chair back reclining locking mechanism is vertically arranged in the chassis, and the first moving member is vertical and inclined in a front-to-back direction; when the chair back connecting member rotates backward, the first moving member drives the track seat to swing and slide downward in the track seat. 
     
     
         20 . The chassis according to  claim 19 , wherein the base comprises a downwardly convex extension seat, the main shaft is arranged on the extension seat, and the track seat is arranged in the extension seat.