Belt type isotonic exercising device

Claim 1

An exercising device for carrying out isotonic exercises, comprising a long and narrow base strip, a straight smooth metal rod, a pair of narrow elongated flat straps secured at one end to said rod and at the other end to said base strip and spaced uniformly at said ends to receive the body of the user between the same, said one ends of said straps being wound entirely upon themselves in rolls on said rod in which each turn of each strap except the first turn is entirely on top of the underlying turn and coextensive therewith to balance the forces on said rod, and a separate slip material for use by the user for gripping the rod, said material offering little frictional resistance to permit slipping of said rod when said rod is moved continuously away from said base with the straps taut and with the rod rotating in the material and the strap rolls unrolling from themselves and the rod, the force required to move the rod being regulated by the grip of the user, said strip having a crosssection in the form of an upwardly curved arch including a convex curved surface on the upper side of said arch to fit the foot of the user and a concave curved surface on the lower side of said arch to receive a fastening means for fastening the lower ends of the straps and said arched base strip having a dome shaped space underneath the same in which the lower ends of the strap fastening means are fixedly connected to said strip.