Pumps – With condition responsive pumped fluid control – Plural pump units with individual or relative control
Patent
1988-11-30
1991-05-07
Smith, Leonard E.
Pumps
With condition responsive pumped fluid control
Plural pump units with individual or relative control
417403, 417487, F04B 300
Patent
active
050131982
ABSTRACT:
An air-hydraulic pump incorporates a primary pumping mechanism for supplying a first level of fluid pressure to a work-performing tool at a first flow rate in response to a supply of pressurized air. An auxiliary pumping mechanism is provided for delivering a second level of hydraulic fluid pressure less than the first level at a flow rate greater than the first flow rate. The auxiliary pumping mechanism provides sufficient pressure to overcome a load on the system up to a predetermined level, after which the auxiliary pumping mechanism ceases operation due to such load and the primary pumping mechanism delivers fluid pressure to the system sufficient to overcome the load. The auxiliary pumping mechanism speeds up operation of the work-performing tool for providing time-saving operation thereof.
REFERENCES:
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patent: 2949080 (1960-08-01), Ottestad
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patent: 3112705 (1963-12-01), Chlebowski
patent: 3775027 (1973-11-01), Craft
patent: 3825122 (1974-07-01), Taylor
patent: 4198844 (1980-04-01), Lowe et al.
patent: 4494398 (1985-01-01), Svoboda
Mitey Mate--II service manual.
Enerpac E-316 Catalog, p. 42.
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