Patent ID: 7540829

Claim:
A treadmill comprising: a horizontal frame having an endless belt rotatably connected thereto and two foldable mechanisms connected to respective sides of the horizontal frame, two upright frames pivotably connected to the two foldable mechanisms, a handle and a control panel connected between the two upright frames; the two foldable mechanisms including two respective foldable sets and an operation bar connected to the two foldable sets, each foldable set having an operation member which is fixed to the upright frame corresponding thereto, the operation member having a groove defined in a side thereof and a periphery defining the groove including multiple recesses, and two end plates each having a first end fixed to one of two ends of the operation bar and a second end of each end plate pivotably connected to the foldable set corresponding thereto, a connection rod extending from the second end of each end plate and fixed to one of two side plates which are fixed to the treadmill, each side plate having a curved slot, an engaging member extending from the first end of each end plate and movably inserted into the groove of the operation member, the engaging member extending through the curved slot of each side plate and engaged with one of the recesses.