Fluid dispenser and a method for its use
AssigneeForlong & Maisey Limited
InventorsDavid Andrew Trow, Paul Fleming Buckley, Malcolm Norman Lynd
Life of this patent
Estimating the term…
Abstract
A valve operating mechanism for use in a fluid dispenser is described, wherein the fluid dispenser includes a reservoir for a fluid to be delivered, a fluid outlet for the reservoir, a piston configured to move through the reservoir, and an actuator for the piston, the valve operating mechanism including a valve, wherein the valve has an upstream side and a downstream side, and in at least one point of operation of the valve operating mechanism, the valve is inoperable as a consequence of the pressure difference between the upstream side of the valve and the downstream side of the valve.
Claims30
A valve operating mechanism for use in a fluid dispenser, wherein the fluid dispenser includes:
- a reservoir for a fluid to be delivered, and
- an fluid outlet for the reservoir, and
- a piston configured to move through the reservoir, wherein the piston includes a
- piston head and piston shaft, and
- an actuator for the piston,
- the valve operating mechanism comprising:
- a valve, wherein the valve has an upstream side and a downstream side;
- and
- the valve operating mechanism including a piston sleeve for the piston shaft,
- wherein the piston sleeve is linked to the actuator such that it is slidably movable relative to the piston shaft,
- wherein the actuator is configured to have at least two ranges of movement,
- wherein the first range of movement closes the valve and the second range of movement displaces the piston such that in at least one point of operation of the valve operating mechanism, the valve is inoperable as a consequence of the pressure difference between the upstream side of the valve and the downstream side of the valve.
A fluid dispenser, comprising:
- a reservoir for a fluid to be delivered;
- a fluid outlet for the reservoir;
- a piston configured to move through the reservoir;
- an actuator for the piston, wherein the piston includes a piston head and piston shaft;
- a valve operating mechanism, including
- a valve, wherein the valve has an upstream side and a downstream side,
- the valve operating mechanism including a piston sleeve for the piston shaft,
- the piston sleeve is linked to the actuator such that it is slidably moveable relative to the piston shaft,
- the actuator is configured to have at least two ranges of movement, the first range of movement closes the valve and the second range of movement displaces the piston such that in at least one point of operation of the valve operating mechanism, the valve is inoperable as a consequence of the pressure difference between the upstream side of the valve and the downstream side of the valve.
Dependencies are inferred from the claim text.