1982-03-12
1985-01-29
Hafer, Robert A.
Undertaking
272 70, 272DIG1, 272DIG4, A63B 2100, A63B 2304
Patent
active
044961472
ABSTRACT:
Apparatus which simulates the exercise obtained while climbing stairs includes two hydraulically phased steps retained in adjacent inclined tracks in which the steps are supported in a hydraulically open-ended system, with the phasing of the steps being controlled by a pair of in-line hydraulic actuators, one each associated with a step, in which fluid forced from one actuator with a downward movement of the associated step is channeled through a variable restricted orifice to the other actuator to raise the other step. In one lightweight, compact embodiment, the device is collapsed down to a compact size through the use of steps which are foldable to the track, and through the use of a track foldable to the frame. In its open position the lower portion of the frame props up the track at an appropriate climbing angle, with upper portions of the frame extending above the track to serve as handles positioned above the center of travel of the steps.
REFERENCES:
patent: 1082940 (1913-12-01), Flora
patent: 1909190 (1933-05-01), Sachs
patent: 1982843 (1934-12-01), Traver
patent: 3128094 (1964-04-01), Wolf
patent: 3511500 (1970-05-01), Dunn
patent: 3529474 (1970-09-01), Olson et al.
patent: 3970302 (1976-07-01), McFee
DeCloux Richard J.
Loeffler Herbert H.
MacConkey James S.
Yonkers E. Hubbard
Arthur D. Little Inc.
Hafer Robert A.
Kramer Arnold W.
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