1981-01-21
1983-02-22
Pinkham, Richard C.
Undertaking
272DIG4, A63B 2306
Patent
active
043745873
ABSTRACT:
A treadmill exercising apparatus comprising a generally planar frame equipped with a planar slider bed and head and tail rollers journalled respectively at the head and tail ends of the frame. The rollers are provided with elastomeric material crowns, over which rollers an endless nylon belt is trained. The frame at its head end is equipped with a cross member in which are threadedly mounted in spaced apart relation a pair of threaded screw members that adjustably support the head end of the frame, with each of said screw members being journalled in its own foot for rotational movement with respect thereto, and with the threaded screw members being coupled together adjacent their upper ends for simultaneous manual operation in the same direction in forward and reverse directions. The screw members shift from an angled position to a substantially vertical position, in firm supporting relation to the treadmill frame, when operated to shift the treadmill frame from horizontal position to the maximum grade effect position. An electric drive motor assembly pivotally mounted on the cross member is spring biased to tension the drive belt stretching between step up and step down pulleys on the head roller and drive motor. A handle on the assembly is used to overcome the spring bias to free the belt for movement between pulleys to change the drive ratio.
REFERENCES:
patent: D211801 (1968-07-01), Quinton
patent: 759296 (1904-05-01), Moriarty
patent: 1824406 (1931-09-01), Petersime
patent: 3643943 (1972-02-01), Erwin, Jr. et al.
patent: 3659845 (1972-05-01), Quinton
patent: 3711812 (1973-01-01), Cherry
patent: 3737163 (1973-06-01), Sumrall
Kramer Arnold W.
Pinkham Richard C.
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