Electric seat rack

Abstract

An electric seat rack, including a driving assembly, a seat frame support assembly, a backrest assembly and two mechanical extension units symmetrically arranged on the left and right, the backrest assembly being hinged to the seat frame support assembly, each mechanical extension unit comprising a leg-foot assembly and a transmission rod. The two leg-foot assemblies are installed on two sides of the seat frame support assembly and are respectively hinged to one ends of the corresponding transmission rods, the other ends of the transmission rods are hinged to the backrest assembly by backrest transmission rod hinge shafts; two ends of a driving rod are respectively connected to the two leg-foot assemblies; the seat frame support assembly comprises two quadrilateral support frames symmetrically arranged on two sides and a connecting assembly for fixing the two quadrilateral support frames into one. The backrest assembly includes a backrest frame and backrest connecting components.

What is claimed is: 
     
         1 . An electric seat rack, comprising a driving assembly, a seat frame support assembly, a backrest assembly and two mechanical extension units symmetrically arranged on left and right, the backrest assembly being hinged to the seat frame support assembly, each of the two mechanical extension units comprising a leg-foot assembly and a transmission rod, wherein two leg-foot assemblies are respectively installed on two sides of the seat frame support assembly and are respectively hinged to first ends of transmission rods, and second ends of the transmission rods are hinged to the backrest assembly by backrest transmission rod hinge shafts;
 two ends of a driving rod of the driving assembly are respectively connected to the two leg-foot assemblies; and   the seat frame support assembly comprises two quadrilateral support frames symmetrically arranged on two sides and a connecting assembly for fixing the two quadrilateral support frames into one.   
     
     
         2 . The electric seat rack according to  claim 1 , wherein a connecting assembly of the seat frame support assembly comprises a front upper connecting component, a front lower connecting component, a rear upper connecting component and a rear middle connecting component; and the front upper connecting component, the front lower connecting component, the rear upper connecting component, and the rear middle connecting component are fixedly connected to the two quadrilateral support frames. 
     
     
         3 . The electric seat rack according to  claim 2 , wherein the driving assembly further comprises a driving device, a front end of the driving device is hinged to the driving rod, and a rear end of the driving device is hinged to the rear middle connecting component. 
     
     
         4 . The electric seat rack according to  claim 1 , wherein the backrest assembly comprises a backrest frame and backrest connecting components; the backrest frame is connected to upper ends of the backrest connecting components by bolts, and lower ends of the backrest connecting components are fixed to the backrest frame by the backrest transmission rod hinge shafts; other ends of the backrest connecting components are hinged to the seat frame support assembly by backrest-seat frame hinge shafts. 
     
     
         5 . The electric seat rack according to  claim 1 , wherein each of the two leg-foot assemblies comprises a first leg link, a second leg link, a third leg link, a fourth leg link, a fifth leg link, a sixth leg link, and a footrest connecting component; and
 first ends of the first leg link and the second leg link are hinged to the seat frame support assembly, a middle part of the first leg link is fixedly connected to the driving rod, the first leg link is hinged to the first end of the transmission rod through a first leg link transmission rod hinge shaft, a second end of the first leg link is hinged to a first end of the third leg link, a middle part of the third leg link is hinged to a middle part of the second leg link, a second end of the third leg link is hinged to a first end of the fifth leg link, a middle part of the fifth leg link is hinged to a middle part of the fourth leg link, a second end of the fifth leg link is hinged to a first end of a sixth leg link, a second end of the sixth leg link is hinged to a first end of the footrest connecting component, a second end of the footrest connecting component is hinged to a first end of the fourth leg link, and a second end of the fourth leg link is hinged to a second end of the second leg link.   
     
     
         6 . The electric seat rack according to  claim 3 , wherein the driving device adopts an electric push rod, and a backrest frame has a tilt angle steplessly adjustable a between 75° and 25°.