Expansible chamber devices – Piston – Radially adjustable side wall portion
Patent
1977-05-16
1979-03-13
Cohen, Irwin C.
Expansible chamber devices
Piston
Radially adjustable side wall portion
92207, 92240, 92250, 277188A, F16J 106, F16J 900
Patent
active
041435869
ABSTRACT:
A mud pump piston comprising an annular elastomeric ring having an annular circumferential surface defining an acute angle circumferential tip of relatively small area which engages the pump cylinder wall and an annular anti-extrusion ring connected to and displaceable with the elastomeric ring, the elastomeric ring being configurated to correspond with and rest against a dish shaped surface of the anti-extrusion ring presenting a bevelled or diagonal slope extending from the outside diameter (acute to the axis of the mud pump piston) spanning substantially more than half of the radial distance occupied by the annular elastomeric ring and the annular anti-extrusion ring, which diagonal surface merges with a flat surface normal to the axis of the mud pump piston whereby hydro-planing is reduced because of the increased unit pressure load on the small tip area, along a line contact, the tip is automatically wear compensating, friction is substantially reduced by reason of the smaller high pressure wipe area, longer piston life is attained with improved wear characteristics and less maintenance.
REFERENCES:
patent: 1977075 (1934-10-01), Magnuson
patent: 2284340 (1942-05-01), Nuckles
patent: 3394939 (1968-07-01), Mastro
patent: 3448665 (1969-06-01), Allinquant
patent: 3603215 (1971-09-01), Leschisin
patent: 3810639 (1974-05-01), Scannell
Cohen Irwin C.
Foster Lynn G.
Poly-Seal
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