US Patent: 2,522,783
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| Hydraulic Pump and Circuit
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Patentee:
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| John P. Golden (exact or similar names) - Columbus, Muscogee County, GA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Apr. 18, 1948 |
| Granted: |
Sep. 19, 1950 |
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Joel Havens
"Vintage Machinery" entry for Goldens' Foundry & Machine Co.
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Description: |
| Abstract:
One of the features of the invention is the provision of a hydraulic pump and circuit, in which the pump is provided with chambers which operate concurrently in the circuit during the initial operations of the load during which a relatively large quantity of liquid is being delivered at a relatively low pressure; together with an unloading apparatus automatically responsive to the pressure being delivered, whereby one of the pumping chambers is operationally disconnected from the circuit and permitted to idle when a preset maximum of this low pressure condition is exceeded.
Claim:
A hydraulic system including a pump having multiple pumping chambers with inlet and outlet valves, a main conduit connected for directly receiving the liquid pumped from one of said chambers, a varying load device connected to the main conduit whereby varying back pressures are established in the main conduit, a second conduit and a valve device therein for selectively delivering to the main conduit the liquid pumped from another of said chambers and for discharging said latter liquid without passage to said main conduit, and a pilot device responsive to the pressure in the main conduit and connected to said valve device for procuring operation of the same from said delivering condition to said releasing condition upon the event that the pressure in said main conduit exceeds a preset maximum. |
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