Patent ID: 7828313

Claim:
An apparatus with a seat which is supported on a seat tube which is vertically adjustably held in a tubular seat frame which seat tube is clamped to the tubular seat frame at a desired height which seat may be adjusted in height while in use comprising: a spring within the tubular seat frame having a lower spring end supported within said tubular seat frame, an upper spring end abutting a lower end of the seat tube, and a side of said spring supported by an inner surface of said tubular seat frame which spring urges the seat tube and its associated seat upwardly with respect to said tubular seat frame; and a seat tube clamp positioned about said tubular seat frame, said seat tube clamp movable between a clamped position which holds the seat tube in a fixed position with respect to said tubular seat frame and an unclamped position which permits the vertical movement of the seat tube with respect to the tubular seat frame whereby a user may adjust the height of the seat while seated thereon by loosening the clamp thereby allowing the spring to raise the seat and then exerting downward pressure on the seat to lower the seat to a desired seat height and then clamping the seat tube at the desired seat height further including means for limiting the upward movement of the seat to retain the seat tube within the tubular seat frame comprising a securing line positioned within said spring and said seat tube, said securing line being affixed at an upper securing line end to one of said seat tube and said seat and at a lower securing line end within said tubular seat frame.