Patent ID: 7806811

Claim:
Curler exercise apparatus comprising first and second frames pivotally mounted to each other at a pivot joint proximate a user's extremity joint and pivotable about a pivot axis between first and second positions for exercising extremity muscles, said first frame extending from said pivot junction to a first distal portion engaging the extremity on a first side of said extremity joint, said second frame extending from said pivot junction to a second distal portion engaging the extremity on a second opposite side of said extremity joint, a biasing member extending axially along said pivot axis and coupled between said first and second frames and biasing said first and second frames toward said first position, said biasing member having a first terminal end extending axially into engagement with said first frame, said biasing member having a second terminal end extending axially into engagement with said second frame; wherein said first and second frames are pivotally mounted to each other by a removable axle having first and second distally opposite axial ends and extending axially between said first and second frames, said biasing member extending along said axle and being removable from said frames upon removal of said axle to enable replacement of said biasing member with a different biasing member to change the bias biasing said first and second frames toward said first position, and wherein said first terminal end of said biasing member circumscribes said first axial end of said axle and extends axially parallel thereto, and said second terminal end of said biasing member circumscribes said second axial end of said axle and extends axially parallel thereto; wherein said first terminal end of said biasing member engages with said first frame via a keyed engagement and wherein said second terminal end of said biasing member engages said second frame via a keyed engagement; wherein said first terminal end of said biasing member comprises one or more flats mating with one or more flats of an aperture formed in the first frame to provide said keyed engagement therebetween; wherein said second terminal end of said biasing member comprises one or more flats mating with one or more flats of an aperture formed in the second frame to provide said keyed engagement therebetween.