Chair

Abstract

The present disclosure relates to a chair, including: a base; a seat frame rotatably mounted on the base; a footrest bracket and a backrest bracket articulated with the seat frame, where the footrest bracket and the backrest bracket are staggered from a rotation axis of the seat frame relative to the base; a rod-linkage structure, including a first rod-linkage assembly connected between the base and the seat frame, and a second rod-linkage assembly connected between the seat frame and the footrest bracket; and a driving unit, used to drive the first rod-linkage assembly and the second rod-linkage assembly to operate, to link rotation of the seat frame and rotation of the footrest bracket.

What is claimed is: 
     
         1 . A chair, comprising:
 a base;   a seat frame rotatably mounted on the base, wherein a footrest bracket and a backrest bracket are articulated with the seat frame, and the footrest bracket and the backrest bracket are respectively staggered from a rotation axis of the seat frame relative to the base;   a rod-linkage structure, comprising a first rod-linkage assembly connected between the base and the seat frame, and a second rod-linkage assembly connected between the seat frame and the footrest bracket; and   a driving unit, configured to drive the first rod-linkage assembly and the second rod-linkage assembly to operate, to link rotation of the seat frame and rotation of the footrest bracket.   
     
     
         2 . The chair according to  claim 1 , wherein an operating range of the rod-linkage structure is within a thickness range of the seat frame. 
     
     
         3 . The chair according to  claim 1 , wherein the driving unit is mounted on a side beam of the seat frame. 
     
     
         4 . The chair according to  claim 1 , wherein the first rod-linkage assembly comprises a first connecting member and a second connecting member,
 the first connecting member and the second connecting member are both articulated between the seat frame and the base, such that the base, the first connecting member, the seat frame, and the second connecting member form a four-bar mechanism.   
     
     
         5 . The chair according to  claim 4 , wherein the first connecting member comprises a rotating shaft, and a toothed plate and a rotating rod fixed on the rotating shaft;
 the rotating shaft is rotatably connected to two side beams of the seat frame;   the toothed plate meshes with an output end of the driving unit; and   the rotating rod is articulated with a side edge of the base.   
     
     
         6 . The chair according to  claim 5 , wherein the toothed plate and a first rod member comprised in the second rod-linkage assembly are both provided with a position limiting slideway;
 a position limiter is fixed on the seat frame; and   the position limiter is in sliding fit with the position limiting slideway, to limit rotation ranges of the toothed plate and the first rod member.   
     
     
         7 . The chair according to  claim 1 , wherein the second rod-linkage assembly comprises: a first rod member, a second rod member, a third rod member, and a fourth rod member;
 the first rod member and the third rod member are both articulated with the seat frame;   the second rod member is articulated between the first rod member and the third rod member, and the seat frame, the first rod member, the second rod member, and the third rod member form a four-bar mechanism; and   the fourth rod member is articulated between the third rod member and the footrest bracket, and the seat frame, the third rod member, the fourth rod member, and the footrest bracket form a four-bar mechanism.   
     
     
         8 . The chair according to  claim 1 , wherein the second rod-linkage assembly comprises: a first rod member, a second rod member, a third rod member, and a speed adjusting structure for adjusting a rotation speed of the footrest bracket;
 the first rod member, the second rod member, and the third rod member are sequentially articulated, the first rod member is articulated with the seat frame, and the third rod member is articulated with the footrest bracket;   the speed adjusting structure comprises: a connecting slideway arranged on the seat frame, and a second sliding member slidably mounted on the connecting slideway, wherein, the second sliding member is articulated at an articulated connection position between the second rod member and the third rod member, such that the seat frame, the first rod member, the second rod member, and the second sliding member form a rod-linkage slider structure; and   the seat frame, the second sliding member, the third rod member, and the footrest bracket form a slider rod-linkage structure, wherein the connecting slideway is divided into two segments, with a same output power from the driving unit, during sliding processes of the second sliding member along the two segments of the connecting slideway respectively, respective rotation speeds of the footrest bracket are different.   
     
     
         9 . The chair according to  claim 1 , wherein a first linkage member is connected between the first rod-linkage assembly and the second rod-linkage assembly. 
     
     
         10 . The chair according to  claim 9 , wherein the seat frame and the footrest bracket are linked through the first linkage member; and
 one end of the first linkage member is articulated with one of a first connecting member and a second connecting member comprised in the first rod-linkage assembly, and the other end of the first linkage member is articulated with one of a first rod member, a second rod member, a third rod member, and a fourth rod member comprised in the second rod-linkage assembly.   
     
     
         11 . The chair according to  claim 1 , wherein the driving unit comprises: a first driving unit for driving the first rod-linkage assembly to operate, and a second driving unit for driving the second rod-linkage assembly to operate. 
     
     
         12 . The chair according to  claim 1 , wherein a second linkage member is connected between the backrest bracket and the rod-linkage structure, to link rotation of the backrest bracket and rotation of the seat frame and/or rotation of the footrest bracket. 
     
     
         13 . The chair according to  claim 1 , wherein the driving unit further comprises a third driving unit for driving rotation of the backrest bracket. 
     
     
         14 . The chair according to  claim 1 , wherein the footrest bracket comprises a footrest body articulated with the seat frame and an extension plate slidably mounted on the footrest body, and
 an extension structure is connected to the seat frame, the extension plate and the footrest body, and the extension plate is able to slide relative to the footrest body during rotation of the footrest body relative to the seat frame.   
     
     
         15 . The chair according to  claim 14 , wherein the extension structure comprises a fifth rod member and a first sliding member;
 one end of the fifth rod member is articulated with the seat frame, and the other end of the fifth rod member is articulated with the first sliding member;   the first sliding member is in sliding fit connection with the footrest body and is connected to the extension plate; and   the seat frame, the footrest body, the fifth rod member, and the first sliding member form a rod-linkage slider structure, and by rotating the footrest body around the seat frame to achieve sliding of the first sliding member relative to the footrest body, the extension plate is thus driven to slide relative to the footrest body.   
     
     
         16 . The chair according to  claim 15 , wherein a sixth rod member and a seventh rod member ( 334 ) are mounted on the footrest body;
 one end of the sixth rod member is articulated with the footrest body, and the other end of the sixth rod member is articulated with the seventh rod member;   one end of the seventh rod member is articulated with the sixth rod member, and the other end of the seventh rod member is articulated with the extension plate; and   the footrest body, the sixth rod member, the seventh rod member, and the extension plate form a rod-linkage slider structure, a bypass slideway is provided on the sixth rod member, and the first sliding member is in the bypass slideway.   
     
     
         17 . The chair according to  claim 14 , wherein the footrest body has a contraction state, an extension state, and an intermediate state between the contraction state and the extension state during a rotation process; and
 during a rotation switching process between the contraction state and the intermediate state of the footrest body, the extension plate is stationary relative to the footrest body, and during a rotation switching process between the intermediate state and the extension state of the footrest body, the extension plate slides relative to the footrest body.   
     
     
         18 . The chair according to  claim 1 , wherein the footrest bracket has a contraction state, an extension state, and a speed change state between the contraction state and the extension state during a rotation process, and a speed adjusting structure for adjusting a rotation speed of the footrest bracket is connected between the footrest bracket and the rod-linkage structure. 
     
     
         19 . The chair according to  claim 18 , wherein a rotation speed of the footrest bracket during a rotation switching process between the contraction state and the speed change state is n1; a rotation speed of the footrest bracket during a rotation switching process between the speed change state and the extension state is n2; wherein, n1>n2. 
     
     
         20 . The chair according to  claim 1 , wherein the seat frame has a recessed portion on a side for sitting to increase sitting activity space; and/or
 a flanging is provided on the seat frame, and/or the footrest bracket, and/or the backrest bracket; and/or   the chair further comprises a power supply for power supply, and the power supply is provided in the base; and/or   an armrest mounting bracket for mounting an armrest is fixedly provided on the seat frame.