Folding device for treadmills

Abstract

A treadmill includes a base and a frame with a running belt is connected to a folding device connected to the base. The folding device includes a support frame which has a first end thereof pivotably connected to the base and a second end of the support frame is pivotably connected to a first end of a sliding frame. A second end of the sliding frame is pivotably connected to the frame. The sliding frame includes sliding members slidably connected to tracks of the base. The sliding members can be disengaged from openings defined in the tracks when the frame is raised. A driving device has one end connected to the frame and the other end of the driving device is pivotably connected to a branch of the sliding frame. The rising angle of the frame can be adjusted by lifting the second end of the sliding frame. When the frame is folded to upright position, the first end of the sliding frame is raised and pivoted upward the second end of the support frame.

1 . A treadmill comprising: 
 a base ( 10 ) and a frame ( 40 );    a folding device comprising a support frame ( 20 ) which has a first end thereof pivotably connected to the base ( 10 ) and a second end of the support frame ( 20 ) is pivotably connected to a first end of a sliding frame ( 30 ), a second end of the sliding frame ( 30 ) pivotably connected to the frame ( 40 ), the sliding frame ( 30 ) having sliding members ( 31 ) slidably connected to tracks ( 11 ) of the base ( 10 ), the tracks ( 11 ) each having an opening ( 111 ) and the sliding members ( 31 ) disengaged from the openings ( 111 ) of the tracks ( 11 ) when the frame ( 40 ) is raised, and    a driving device having one end connected to the frame ( 40 ) and the other end of the driving device pivotably connected to a branch ( 32 ) of the sliding frame ( 30 ).    
   
   
       2 . The treadmill as claimed in  claim 1 , wherein the driving device includes a motor ( 42 ) and a threaded output rod ( 43 ), a nut ( 33 ) connected to the branch ( 32 ) and the threaded output rod ( 43 ) threadedly extending through the nut ( 33 ).  
   
   
       3 . The treadmill as claimed in  claim 1 , wherein the support frame ( 20 ) includes a stretch rod ( 22 ) which is connected to a mediate point of an underside of the frame ( 40 ).  
   
   
       4 . The treadmill as claimed in  claim 1  further comprising two pneumatic bars ( 44 ) connected between the support frame ( 20 ) and the frame ( 40 ).