Undertaking
Patent
1990-01-10
1991-06-25
Crow, Stephen R.
Undertaking
272130, A63B 2304, A63B 2100
Patent
active
050260464
ABSTRACT:
An auxiliary cylinder is provided as an adjustable volume accumulator in communication with the two hydraulic ram cylinders utilized to phase the steps utilized in stair climbing apparatus. Step height adjustment is facilitated by providing the auxiliary cylinder with a ram and a positioning lever, with step height adjustment being accomplished through the removal of oil from the system by backing off the ram. Moving the ram forward replaces oil lost during carry out. The subject system facilitates rapid step height adjustment, facilitates lowering of the steps for permitting under-bed storage through the dropping of the steps, and makes up fluid loss during carry out for preventing step height loss. Additionally, operating cylinder component sizing is used to minimize step height growth due to thermal expansion of the fluid in the system.
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patent: 3529474 (1970-09-01), Olson et al.
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patent: 4566692 (1986-01-01), Brentham
patent: 4629185 (1986-12-01), Amann
patent: 4681316 (1987-07-01), DeCloux
patent: 4733858 (1988-03-01), Lan
Crow Stephen R.
Tendler Robert K.
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