Dispensing – With discharge assistant – With discharge volume varying means
Patent
1986-02-25
1987-03-31
Skaggs, H. Grant
Dispensing
With discharge assistant
With discharge volume varying means
222389, 222391, 222327, 741415, 74334, G01F 1106
Patent
active
046536736
ABSTRACT:
A positive displacement pump (10) for precisely dispensing liquids through a dispensing tube (126) in which there is a pump body (12) having a shaft (18) fitted for reciprocating therein. Incremental adjusting nuts (24, 26) on an outer end (22) of the shaft limit the movement thereof in a pumping direction. There is a first friction clamp (46) pivotally mounted adjacent one of its ends on the other end (48) of the shaft and a second friction clamp (82) is pivotally mounted adjacent one of its ends on a member (80) fixed to the body (12) adjacent the other end (48) of the shaft (18). The other ends of the clamps (46, 82) have cylindrical openings (66, 92) in substantial alignment to receive a hardened, smoothly finished pump rod (102). The pump rod is precisely aligned in bushings (98, 100) secured to the pump body. There are springs (70) and (90) biasing the clamps between the pivotal mountings and the cylindrical openings against the direction of pumping. The shaft (18) when moved in the pumping direction moves the first clamp against its bias in the direction of pumping and maintaining its grip on the rod (102) and carries it in the direction of pumping to the extent permitted. At the same time the clamp (82) releases its grip on the rod to permit it to slide in the pumping direction. When the shaft (18) is reversed in direction, friction clamp (46) releases its grip and at the same time the friction clamp (82) maintains its grip on the rod (102) holding it from moving against the pumping direction. This arrangement effects a precise pumping motion so as to precisely dispense a required and predetermined quantity of liquid.
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Heberer Eugene O.
Skaggs H. Grant
The Boeing Company
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