Refill unit for incrementally filling fluid container
View Patent ↗A refill unit for a fluid container is provided. The unit has a housing defining a fluid path in fluid communication with an outlet and configured to be operatively engaged with the fluid container, a fluid reservoir having an ejection port arranged in fluid communication with the fluid path inside the housing, and an ejector assembly having a piston and cylinder reservoir, said piston having a thread which engages a screw thread in an internal wall of the cylinder, the piston rotationally biased by a wound spring and the ejector assembly having a pawl-and-ratchet detent preventing the biased piston threading into the reservoir until the pawl is actuated by operative engagement of the fluid container with the housing to incrementally eject fluid from the reservoir.
1. A refill unit for a fluid container, said unit comprising:
a housing defining a fluid path in fluid communication with an outlet and configured to be operatively engaged with the fluid container;
a fluid reservoir having an ejection port arranged in fluid communication with the fluid path inside the housing; and
an ejector assembly having a piston and cylinder reservoir, said piston having a thread which engages a screw thread in an internal wall of the cylinder, the piston rotationally biased by a wound spring and the ejector assembly having a pawl-and-ratchet detent preventing the biased piston threading into the reservoir until the pawl is actuated by operative engagement of the fluid container with the housing to incrementally eject fluid from the reservoir.
2. The unit of claim 1 , wherein the housing includes a collapsible reservoir storing the fluid and having the outlet at one end thereof.
3. The unit of claim 1 , wherein the outlet includes a syringe needle arranged to penetrate a valve seal of the fluid container.
4. The unit of claim 1 , wherein the housing defines a docking port including the outlet which is configured to dock with a refill port of the fluid container.
5. The unit of claim 1 , wherein the housing defines an aperture via which the fluid container actuates the ejector assembly.