Pumps – Expansible chamber type – Having pumping chamber pressure responsive distributor
Patent
1983-09-09
1985-09-10
Freeh, William L.
Pumps
Expansible chamber type
Having pumping chamber pressure responsive distributor
92240, 92243, 92244, F04B 2102, F16J 908
Patent
active
045403520
ABSTRACT:
A pump comprises a housing member bounding an elongated cylinder bore, a piston member received in the cylinder bore for reciprocation substantially longitudinally thereof, a drive for the piston member, and a sealing arrangement between the piston member and the housing member. The sealing arrangement includes at least one sealing element having a radial supporting section and at least one lip section sealingly contacting the housing member. The wall thickness of the supporting section exceeds that of the lip section. The sealing arrangement may further include another lip section pointing in the opposite direction counter to that of the one lip section, either provided integrally on the same sealing element or separately on a discrete second sealing element assembled with the initially mentioned sealing element to form the sealing arrangement. When the piston member carries out a pendular movement, the cross section or diameter of the cylinder bore is reduced toward and in the axially central region thereof as compared with the diameter at the axial ends of the bore, to reduce the width of the radial gap which the sealing arrangement has to bridge.
REFERENCES:
patent: 2284645 (1942-06-01), Duffy
patent: 2985358 (1961-05-01), Lee et al.
patent: 3848518 (1974-11-01), Martin
patent: 3961869 (1976-06-01), Droege, Sr. et al.
patent: 4028015 (1977-06-01), Hetzel
patent: 4039270 (1977-08-01), Hiraga
patent: 4396363 (1983-08-01), Sakamaki et al.
Freeh William L.
Kontler Peter K.
Neils Paul F.
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