Dripless dispenser and method of dispensing a flowable material

Details Dripless dispenser and method of dispensing a flowable material Dripless dispenser and method of dispensing a flowable material

1976-03-19

1978-06-20

Knowles, Allen N.

Dispensing

Processes of dispensing

91 36, 222207, 222214, 222108, 251 5, 251 7, B65D 3700

Patent

active

040957225

ABSTRACT:
A flowable material dispenser having a bore therethrough. A resilient pinch-off tube is removably fitted within the bore. A flowable material reservoir is connected to one end of the tube. At least one dispensing nozzle or needle is coupled to the other end of the tube. Within the dispenser is a mechanism for selectively squeezing the tube to force selected amounts of the flowable material out the needle, and then to draw any residual amount of the material in the needle back away from the distal end of the needle thereby to eliminate dripping. Connected to the squeezing mechanism is a control system for sequencing the squeezing operation to perform the method of the invention which includes the steps of filling the tube with material, isolating a portion of the material in the tube from the reservoir, dispensing a portion of the isolated material, drawing the remaining portion of the isolated material in the needle back away from the distal end of the needle, and refilling the tube with material.

REFERENCES:
patent: 1799113 (1931-03-01), Miedbrodt
patent: 2673011 (1954-03-01), Rood et al.
patent: 3245269 (1966-04-01), Ivig
patent: 3550619 (1976-12-01), Halasz et al.
patent: 3895748 (1975-07-01), Klingenberg
patent: 3937440 (1976-02-01), MacGregor et al.
patent: 3998103 (1976-12-01), Bjorklund et al.
patent: 4042153 (1977-08-01), Callahan et al.

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