Pumps – With signal – indicator – or inspection means
Patent
1997-07-07
2000-01-11
Vrablik, John J.
Pumps
With signal, indicator, or inspection means
92 138, F01B 3114, F04B 4900
Patent
active
060129034
ABSTRACT:
A piston-type positive-displacement liquid-metering pump with an output-control apparatus for varying the pump output volume per piston stroke by very minute amounts on a smoothly gradual and continuous basis, in which an actuator or actuation portion of the piston has an associated stop structure for limiting its allowable movement to thereby limit the output volume produced on each stroke of the piston, and an indexing member disposed in alignment with the stop structure and having a portion engageable therewith to effect the aforementioned limitation on allowable piston movement and thus define the stroke length of the piston. A continuously variable coupling is operatively disposed between the indexing member and the pump body and/or the indexing member, for changing the effective position of the stop structure relative to the pump body or indexing member and thus changing the allowable length of the piston stroke. Preferably, the stop structure comprises an abutment member such as a spring clip secured along the length of the piston, and the indexing member comprises a co-acting abutment structure disposed in a position to be contacted by the spring clip or other stop carried on the piston. The continuously variable coupling preferably comprises a threaded interconnection between the indexing member and the pump body or a coupling member carried by the body. In a particular preferred embodiment, the threaded connection just noted is implemented by cooperating structures which provide a Vernier-type readout such as that utilized in micrometers, in which an internally threaded barrel-like member has an end extremity which is movable along and relative to an underlying series of indicia, providing a desirable visual indication of the different positions of adjustment resulting from variation of the threaded engagement.
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Vrablik John J.
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