Seal in pump piston intermittently permitting conduction of pump

Details Seal in pump piston intermittently permitting conduction of pump Seal in pump piston intermittently permitting conduction of pump

1974-12-18

1976-09-28

Croyle, Carlton R.

Expansible chamber devices

With lubricating means

Valve means in lubricant passage

92158, 92168, 417511, 277177, F01M 104, F16J 1516

Patent

active

039824713

ABSTRACT:
An improvement in liquid pumps having a piston with a packing surface which reciprocates in contact with a cylinder, comprising means for increasing the life of the packing by transmitting thereto a small portion of the liquid being pumped, for absorption thereby to cool and lubricate the frictional interface. The structure includes a groove in the piston head and an annular member of flexible material having inherent lubricity which continuously engages the cylinder, but is smaller in cross-section than the groove so that at each reversal of the piston a tortuous passage is briefly opened past the member through the groove.

REFERENCES:
patent: 1145733 (1915-07-01), Wright
patent: 2253739 (1941-08-01), Trexler
patent: 2398910 (1946-04-01), Pontius
patent: 2919652 (1960-01-01), Fay
patent: 3046070 (1962-07-01), Gearhart
patent: 3388915 (1968-06-01), Dega

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