Diaphragm-type pumping apparatus
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United States of America Patent
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Jun 1, 2004
Grant Date -
Jun 5, 2003
app pub date -
Nov 26, 2002
filing date -
Dec 5, 2001
priority date (Note) -
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Abstract
A diaphragm-type pumping apparatus (1) includes a pair of diaphragms (12), each defining a fluid delivering chamber (14) and a working fluid chamber (15), a main body section (2) operatively supporting a center rod (11) so as to allow a reciprocating motion thereof, and a pair of casing members (3), arranged so as to hold the main body section 2 from opposite sides thereof and functioning in association with the main body section (2) to clamp the peripheral portions (42), of the respective diaphragms (12), from opposite sides along a thickness direction thereof. The diaphragm has an annular lip section (43) extending in either side along a direction of the reciprocation motion of the center rod (11) and also along the thickness direction of the diaphragm 12. An annular wall section (28) for defining an annular recess (27) is formed in the casing member (3), and an annular threaded member (44) is engaged with an outer surface of the annular wall section (28) for compressing the annular lip section (43) against the main body section (2) and the casing member (3).
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