NASA NTRS · 19910004420
Hydraulic lifting device
Abstract
A piston and cylinder assembly is disclosed which is constructed of polyvinyl chloride that uses local water pressure to perform small lifting tasks. The chamber is either pressurized to extend the piston or depressurized to retract the piston. The present invention is best utilized for raising and lowering toilet seats.
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Terrell, Kyle. 1990-06-28. Hydraulic lifting device. https://ntrs.nasa.gov/citations/19910004420
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