Pumps – Expansible chamber type – Mechanically actuated distributor
Patent
1992-09-04
1994-04-12
Bertsch, Richard A.
Pumps
Expansible chamber type
Mechanically actuated distributor
417512, 417519, 417532, 417900, F04B 1502
Patent
active
053020944
ABSTRACT:
A tube switch for a double-cylinder sludge pump is provided including a swing pipe, a wearing ring and an elastic member. The swing pipe is adapted to swivel in front of a center plate and includes an extension portion having an inner surface. The wearing ring is supported between the end of the swing pipe and the center plate and is axially movable relative to the swing pipe. The wearing ring has a recess formed at one end thereof, defined by a sloped boundary surface. The swing pipe is adapted to receive the end of the wearing ring including the recess therein. The recess thus defines an annular space between the swing pipe and the wearing ring with the inner surface of the extension portion of the swing pipe facing the annular space. The elastic member includes a radial inner surface and a sloped front end surface that corresponds to the boundary surface of the wearing ring. The elastic member is supported between the swing pipe and the wearing ring within the annular space. The front end surface of the elastic member abuts the boundary surface of the wearing ring. The inner surface of the extension portion of the swing pipe is ridgeless such that generally no portion of the swing pipe contacts the radial inner portion of the elastic member.
REFERENCES:
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patent: 4019839 (1977-04-01), Schwing
patent: 4178142 (1979-12-01), Schwing
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patent: 4373875 (1983-02-01), Schwing
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patent: 4614483 (1986-09-01), Hudelmaier
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patent: 4979884 (1990-12-01), Letarte et al.
patent: 5037275 (1991-08-01), Schlecht
Benckert Hartmut
Schlecht Karl
Bertsch Richard A.
Korytnyk Peter
Putzmeister-Werk Maschinenfabrik GmbH
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