Dispenser having an improved metering chamber

Details Dispenser having an improved metering chamber Dispenser having an improved metering chamber

1988-12-13

1990-11-27

Huppert, Michael S.

Dispensing

With discharge assistant

With biasing means for discharge assistant and/or its casing

222181, 222361, B65D 8854

Patent

active

049729780

ABSTRACT:
A cylinder including an opening and inlet and outlet ports. A biasing member, within the cylinder, includes a first end fixed relative to the cylinder and a second end closer to the opening. A rotatable slidable member includes an angled first surface on which the biasing member second end is disposed, an opposite second surface closer to the opening and a variable width surface for closing the inlet port. A piston has arotatable rod and a flange surface which faces the second surface of the slidable member. On the piston rod is at least one hinging member. A protrusion fixed relative to the cylinder pushes the hinging member when the piston is moved so that this hinging member can close the outlet port. A plurality of these hinging members define an umbrella-shaped seal for losing the port at various rotational positions of the rod. An O-ring seal is disposed between both the piston flange surface and the slidable member second surface. This seal continuously engages a circumferential segment of the cylinder interior surface when the piston is prevented from movement, the slidable member second surface is exerting a force on the seal and a piston flange surface is exerting an opposing force on the seal and continuously engages a circumferential segment of the cylinder interior surface when the piston is moved, a piston flange surface is exerting a force on the seal and the slidable member second surface is exerting an opposing force on the seal.

REFERENCES:
patent: 1986343 (1935-01-01), Iskyan
patent: 2709025 (1955-05-01), Scott
patent: 3540630 (1970-11-01), Brown et al.
patent: 4036406 (1977-07-01), Jespersen et al.
patent: 4360130 (1982-11-01), Nishimura et al.
patent: 4493440 (1985-01-01), von Buelow et al.
patent: 4570826 (1986-02-01), Fattori

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