Seat bracket and seat unit

Abstract

Disclosed are a seat bracket and a seat unit. The seat bracket includes an intermediate transmission assembly and an extension assembly mounted on the intermediate transmission assembly, in which the extension assembly includes: an extension structure, hinged to the intermediate transmission assembly; a first transition link, hinged to the extension structure; a limit member, where a relative position between the limit member and the first transition link remains unchanged during the adjustment of a position of the extension assembly; a first footrest member, mounted to the first transition link; and an elastic member, acting on the first footrest member so that the first footrest member consistently has a movement tendency to be abutted against the limit member.

1 . A seat bracket, comprising an intermediate transmission assembly and an extension assembly mounted on the intermediate transmission assembly, wherein the extension assembly comprises:
 an extension structure, hinged to the intermediate transmission assembly;   a first transition link, hinged to the extension structure;   a limit member, wherein a relative position between the limit member and the first transition link remains unchanged during the adjustment of a position of the extension assembly;   a first footrest member, mounted onto the first transition link; and   an elastic member, acting on the first footrest member so that the first footrest member consistently has a movement tendency to be abutted against the limit member.   
     
     
         2 . The seat bracket according to  claim 1 , wherein the limit member is provided on the first transition link. 
     
     
         3 . The seat bracket according to  claim 1 , wherein the elastic member is provided between the first footrest member and the first transition link. 
     
     
         4 . The seat bracket according to  claim 3 , wherein the first transition link is provided with a first extension plate, the first footrest member is provided with a second extension plate,
 an end of the elastic member is connected to the first extension plate, and an opposite end of the elastic member is connected to the second extension plate.   
     
     
         5 . The seat bracket according to  claim 4 , wherein the elastic member is a tension spring. 
     
     
         6 . The seat bracket according to  claim 1 , wherein the first footrest member is provided with a limit plate cooperated with the limit member. 
     
     
         7 . The seat bracket according to  claim 1 , wherein the first transition link is hinged with a second footrest member, the second transition link is provided between the second footrest member and the extension structure,
 an end of the second transition link is hinged to the second footrest member, and an opposite end thereof is hinged to the extension structure.   
     
     
         8 . The seat bracket according to  claim 7 , further comprising a drive member mounted on the intermediate transmission assembly, configured to drive the extension assembly to switch between an extended state and a retracted state,
 the extension structure is provided with a first limit protrusion, the second footrest member is provided with a limit notch cooperated with the first limit protrusion, and   the limit notch is snap-fitted to the first limit protrusion when the extension assembly is in the retracted state.   
     
     
         9 . The seat bracket according to  claim 8 , the extension structure comprising:
 a first drive link and a second drive link, both hinged to the intermediate transmission assembly;   a first extension link and a second extension link, both hinged to the first transition link, wherein the first extension link is hinged to the first drive link and is hinged to the second drive link; the second extension link is hinged to the second drive link;   hinge points of the second drive link with respect to the intermediate transmission assembly, the first extension link, and the second extension link are defined as a first hinge point, a second hinge point, and a third hinge point, respectively; and   the second hinge point is located between the first hinge point and the third hinge point.   
     
     
         10 . The seat bracket according to  claim 9 , wherein the first extension link is provided with a second limit protrusion, the second drive link is provided with an extended notch and a retracted notch that are adapted to the second limit protrusion,
 a hinge point between the first extension link and the first drive link is defined as a fourth hinge point, a hinge point between the first extension link and the first transition link is defined as a fifth hinge point,   the second hinge point is located between the fourth hinge point and the fifth hinge point, the second limit protrusion is located between the second hinge point and the fourth hinge point,   the second limit protrusion is snap-fitted into the extended notch when the extension assembly is in the extended state, and the second limit protrusion is snap-fitted into the retracted notch when the extension assembly is in the retracted state.   
     
     
         11 . The seat bracket according to  claim 1 , wherein the elastic member is a torsion spring,
 the first footrest member is hinged to the first transition link through a pin, the elastic member is sleeved outside the pin, an end of the elastic member is mounted to the first footrest member, and an opposite end thereof is mounted to the first transition link.   
     
     
         12 . A seat unit, comprising a floor armrest and a seat bracket, the seat bracket comprising an intermediate transmission assembly and an extension assembly mounted on the intermediate transmission assembly, wherein the extension assembly comprises:
 an extension structure, hinged to the intermediate transmission assembly;   a first transition link, hinged to the extension structure;   a limit member, wherein a relative position between the limit member and the first transition link remains unchanged during the adjustment of a position of the extension assembly;   a first footrest member, mounted onto the first transition link; and   an elastic member, acting on the first footrest member so that the first footrest member consistently has a movement tendency to be abutted against the limit member,   wherein the intermediate transmission assembly is mounted to the floor armrest, the first footrest member is provided with a first footrest plate, and, during the switching of extension assembly from an extended state to a retracted state, the elastic member is capable of being extended to enable the first footrest member to be disengaged from the limit member when the first footrest plate is subjected to an external force in a direction from the floor armrest to the first footrest plate.   
     
     
         13 . The seat unit according to  claim 12 , wherein the limit member is provided on the first transition link. 
     
     
         14 . The seat unit according to  claim 12 , wherein the elastic member is provided between the first footrest member and the first transition link. 
     
     
         15 . The seat unit according to  claim 14 , wherein the first transition link is provided with a first extension plate, the first footrest member is provided with a second extension plate,
 an end of the elastic member is connected to the first extension plate, and an opposite end of the elastic member is connected to the second extension plate.   
     
     
         16 . The seat unit according to  claim 15 , wherein the elastic member is a tension spring. 
     
     
         17 . The seat unit according to  claim 12 , wherein the first footrest member is provided with a limit plate cooperated with the limit member. 
     
     
         18 . The seat unit according to  claim 12 , wherein the first transition link is hinged with a second footrest member, the second transition link is provided between the second footrest member and the extension structure,
 an end of the second transition link is hinged to the second footrest member, and an opposite end thereof is hinged to the extension structure.   
     
     
         19 . The seat unit according to  claim 12 , wherein the first footrest plate is mounted on a mounting plane of the first footrest member, a width of the first footrest plate is greater than that of the first footrest member, and a width direction of the first footrest plate is parallel to a width direction of a mounting plane of the first footrest member. 
     
     
         20 . The seat unit according to  claim 19 , wherein a width of the mounting plane of the first footrest member is less than or equal to 100 mm, and the width of the first footrest plate is in a range of 110 mm to 130 mm.