Electric lifting platform

Abstract

An electric lifting platform includes a platform table, a two-way screw fixed below a bottom surface of the platform table, a motor including an output end fixedly connected to one end of the two-way screw, a sliding device fixed on the bottom surface of the platform table and parallel to the two-way screw, and two movable frames. First ends of the two movable frames are fixed at positions on the bottom surface of the platform table close to two ends of the platform table, respectively. Second ends of the two movable frames are connected to two screw nuts of the two-way screw, respectively, and also connected to two ends of the sliding device, respectively.

1 . An electric lifting platform comprising:
 a platform table;   a two-way screw fixed below a bottom surface of the platform table;   a motor including an output end fixedly connected to one end of the two-way screw;   a sliding device fixed on the bottom surface of the platform table and parallel to the two-way screw, the sliding device including two sets of sliding assemblies provided on two sides of the two-way screw, respectively, each of the two sets of sliding assemblies including a sliding rail arranged on the bottom surface of the platform table and parallel to the two-way screw; and   two movable frames, first ends of the two movable frames being fixed at positions on the bottom surface of the platform table close to two ends of the platform table, respectively, and second ends of the two movable frames being connected to two screw nuts of the two-way screw, respectively, and connected to two ends of the sliding device, respectively;   wherein a length of each of the sliding rails is shorter than a distance between the first ends of the two movable frames.   
     
     
         2 . The electric lifting platform according to  claim 1 , wherein each of the two sets of sliding assemblies further includes:
 two sliders fixedly connected to the second ends of the two movable frames, respectively.   
     
     
         3 . The electric lifting platform according to  claim 1 , wherein a stroke of each of the sliding rails is greater than or equal to twice of a one-way stroke of the two-way screw. 
     
     
         4 . The electric lifting platform according to  claim 2 , wherein each of the movable frames includes:
 a connecting plate fixedly connected to one of the screw nuts and one of the sliders; and   two linkage assemblies provided at two ends of the connecting plate, respectively, ends of the linkage assemblies being hinged to the platform table.   
     
     
         5 . The electric lifting platform according to  claim 4 , wherein each of the linkage assemblies includes:
 a primary bar, an end of the primary bar being hinged to an end portion of the connecting plate; and   a secondary bar, a first end of the secondary bar being hinged to the bottom surface of the platform table, and a second end of the secondary bar being hinged to a middle portion of the primary bar.   
     
     
         6 . (canceled) 
     
     
         7 . The electric lifting platform according to  claim 5 , wherein:
 the end of the primary bar is a first end of the primary bar;   a length of the primary bar is twice of a length of the secondary bar;   a distance between a second end of the primary bar and the second end of the secondary bar is greater than or equal to the length of the secondary bar; and   a one-way stroke of the two-way screw is greater than or equal to the length of the secondary bar.   
     
     
         8 . (canceled) 
     
     
         9 . (canceled) 
     
     
         10 . (canceled) 
     
     
         11 . The electric lifting platform according to  claim 5 , wherein the end of the primary bar is hinged to an end side surface of the connecting plate. 
     
     
         12 . The electric lifting platform according to  claim 5 , wherein a distance between the two sliding rails is shorter than a distance between the two primary bars of the two linkage assemblies. 
     
     
         13 . The electric lifting platform according to  claim 1 , wherein a length of the two-way screw equals the length of each of the sliding rails.