Controlled volume liquid meter defining improved plunger means

Details Controlled volume liquid meter defining improved plunger means Controlled volume liquid meter defining improved plunger means

1979-03-12

1981-05-12

Scherbel, David A.

Dispensing

Supply containers with traps

With trap chamber cutoffs

251 7, A61M 514

Patent

active

042666970

ABSTRACT:
A controlled volume liquid meter comprises a liquid metering chamber defined between a rigid wall and an opposed flexible membrane wall. Inlet and outlet ports are positioned adjacent the ends of the chamber with the ports defining paths of liquid flow therethrough which are transverse to the direction of liquid flow in the chamber. A pair of plunger members are provided, along with apparatus for alternatingly pressing the plunger members against the membrane wall and inserting the plunger members into the inlet and outlet ports to alternatingly open and close them. In accordance with this invention, the plunger members permit variation of the length of each plunger member, with a spring urging the plunger members to occupy their maximum lengths. As a result of this, the force with which the plunger members press against the membrane wall is limited to a value governed by the spring.

REFERENCES:
patent: 1993442 (1935-03-01), Greven
patent: 2565903 (1951-08-01), Zellweger
patent: 4121584 (1978-10-01), Turner et al.

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