Fluid-pressure and analogous brake systems – With pump
188290, 417307, B60T 1318
An improved hydraulic valve system particularly adapted for use in a hydraulic circuit of an exercise apparatus in order to more quickly equalize the high and low pressure sides of the hydraulic circuit when a load is removed therefrom. The valve system is adapted to allow the high pressure side after the force has ceased to open a relief valve so as to allow the low pressure side and the reservoir to quickly come into equilibrium with the high pressure side. In this fashion, the tendency of the base line pressure to be elevated during repetitive exercises is obviated and accurate exercise data can be accumulated.
patent: 2551677 (1951-05-01), Hoffstrom
patent: 2665552 (1954-01-01), Deardorff
patent: 2946416 (1960-07-01), Snoy
patent: 3398551 (1968-08-01), Yannascoli
patent: 3514162 (1970-05-01), Erlebach et al.
Jenkins Richard E.
Reger Duane A.
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