Pedal exerciser

Abstract

A pedal exerciser includes a support frame operable between an expanded state and a folded state, a pedal unit, and two positioning units. The support frame includes a main rod with an arc-shaped intermediate portion interconnecting two pivot end portions, and two stands connected pivotally and respectively to the pivot end portions of the main rod such that each stand is rotatable relative to the main rod between a supporting position and a retracted position. Each positioning unit is disposed in the support frame for positioning a corresponding stand in the supporting position.

What is claimed is: 
     
         1 . A pedal exerciser comprising:
 a support frame operable between an expanded state and a folded state, and including
 a main rod having two pivot end portions opposite to each other in a first direction, and an arc-shaped intermediate portion interconnecting said pivot end portions, and 
 two stands connected pivotally and respectively to said pivot end portions of said main rod such that said stands are rotatable relative to said main rod, 
 wherein, when said support frame is in the expanded state, each of said stands is moved away from the other one of said stands to a supporting position, and when said support frame is in the folded state, each of said stands is moved toward the other one of said stands to a retracted position such that said stands are placed under said arc-shaped intermediate portion of said main rod and between said pivot end portions of said main rod, and overlap each other; 
   an axial tube mounted on said arc-shaped intermediate portion of said main rod of said support frame and extending in an axial direction transverse to the first direction;   a pedal unit including
 a crank member disposed pivotally in said axial tube and having opposite ends extending outward of said axial tube, and 
 two pedals connected respectively to said ends of said crank member; and 
   two positioning units each disposed in said support frame for positioning a corresponding one of said stands in the supporting position.   
     
     
         2 . The pedal exerciser as claimed in  claim 1 , wherein each of said stands includes:
 a first support rod extending in the axial direction, and   a second support rod transverse to said first support rod and having a first end connected to said first support rod, and a second end opposite to said first end and connected pivotally to a corresponding one of said pivot end portions of said main rod such that said second support rod is rotatable about a pivot axis parallel to the axial direction relative to said main rod.   
     
     
         3 . The pedal exerciser as claimed in  claim 2 , wherein each of said pivot end portions of said main rod is tubular to permit insertion of said second end of said second support rod of a corresponding one of said stands thereinto, and is formed with a notch extending toward said intermediate portion of said main rod to permit outward extension of said second end of said second support rod of the corresponding one of said stands therethrough when the corresponding one of said stands moves from the supporting position to the retracted position. 
     
     
         4 . The pedal exerciser as claimed in  claim 3 , wherein:
 said second support rod of each of said stands of said support frame is tubular; and   each of said positioning units includes
 a first positioning hole formed in a corresponding one of said pivot end portions of said main rod, 
 a second positioning hole formed in said second end of said second support rod of the corresponding one said stands, and 
 a spring-loaded positioning knob mounted in said second end of said second support rod of the corresponding one of said stands, extending through said second positioning hole, and engaging releasably said first positioning hole when the corresponding one of said stands is in the supporting position. 
   
     
     
         5 . The pedal exerciser as claimed in  claim 2 , wherein each of said stands of said support frame further includes two anti-slip blocks connected respectively to opposite ends of said first support rod of a corresponding one of said stands. 
     
     
         6 . The pedal exerciser as claimed in  claim 1 , further comprising a resistance adjusting member mounted on and extending into said axial tube and operable to adjust rotation resistance on said crank member of said pedal unit.