Foldable treadmill

Abstract

A foldable treadmill includes a base frame, a tread base having a roller assembly provided at its front side for reciprocating on the base frame, two supports each having two ends respectively pivoted to the base frame and the tread base, and a plurality of spring members connected between the base frame and the tread base for pulling the tread base to turn the tread base about the pivoted point at the supports to the received position while a rear side of the tread base is lifted from the floor by an external force.

1 . A foldable treadmill comprising: 
 a base frame placed on the floor;    a tread base mounted on said base frame and having a roller assembly mounted at its front side for reciprocating along said base frame;    at least one support each having two ends respectively pivotally connected with said base frame and said tread base; and    at least one spring member each having two ends respectively connected with said tread base and a rear side of said base frame;    whereby while said roller assembly is moved to a front side of said base frame to stretch said spring member, said tread base and said support are received in said base frame; while a rear side of said tread base is lifted from the floor by an external force, each said spring member pulls said roller assembly to move toward the rear side of said base frame, and said tread base is turned relatively to said support to move the rear side thereof to be turnup to enable said treadmill in a folded status.    
   
   
       2 . The foldable treadmill as defined in  claim 1 , wherein said base frame comprises a left-side tube, a right-side tube, at least one guide tube, a front tube, and a rear tube, a front tube, said left-side and right-side tubes and said guide tube being parallel to one another, said left-side and right-side tubes each being vertically connected between ends of said front and rear tubes, said guide tubes each being mounted between said left-side and right-side tubes, said at least one spring member each being mounted in said left-side and right-side tubes and each said guide tube.  
   
   
       3 . The foldable treadmill as defined in  claim 2 , wherein said tread base comprises a tilting motor having an output shaft facing downwards for moving a push member, said push rod having a pivot rod pivotally connected to its distal end, said pivot rod having two tilting rods respectively provided at its two distal ends, said tilting rods each having an end pivotally connected with said base frame and the other end extending toward the front side of said tread base; said roller assembly is pivotally mounted to front ends of said two tilting rods.  
   
   
       4 . The foldable treadmill as defined in  claim 3 , wherein said roller assembly comprises a sliding bar and at least one roller, said sliding bar being pivotally coupled to the front end of each said tilting rod, said at least one roller each being provided for reciprocating on said base frame.  
   
   
       5 . The foldable treadmill as defined in  claim 4 , wherein said base frame comprises a locating rod axially mounted in said rear tube of said base frame; said at least one spring member each has two ends respectively connected to said sliding bar and said locating rod for generating resilience for pulling said sliding bar from the front end to the rear end of said base frame.  
   
   
       6 . The foldable treadmill as defined in  claim 5 , wherein said left-side tube, said right-side tube, and said at least one guide tube each have a sliding slot; said at least one guide tube each has a locating axle at a rear side of each said locating axle; said at least one support each has an end pivotally connected to said locating axel; said sliding bar is inserted through said sliding slots of said left-side tube, said right-side tube, and said at least one guide tube.  
   
   
       7 . The foldable treadmill as defined in  claim 6 , wherein said at least one support each has two ends respectively pivotally connected to said locating axles and said pivot rod of said tread base.  
   
   
       8 . The foldable treadmill as defined in  claim 1 , wherein said base frame comprises a handrail upwardly extended from a front side thereof, and a fixer mounted on said handrail for fixing said tread base to said handrail while a rear end said tread base is turnup in the folded status.  
   
   
       9 . The foldable treadmill as defined in  claim 8 , wherein said tread base comprises a locker for locking said tread base to said base frame to prevent returning to the folded status.  
   
   
       10 . The foldable treadmill as defined in  claim 1 , wherein said base frame further comprises a locking member pivotally mounted thereon for locking said tread base while said tread base is in a folded status, said locking member having a locking portion and a footplate portion, whereby when the tread base is turned to the folded status by the resilience of said at least one spring member, said locking portion locks said tread base to said base frame; when the user treads on said footplate portion, said locking portion is partially detached from said tread base.