Fluid dispenser

Patent metadata

Field	Value
Publication number	US-9821333-B2
Application number	US-201414223052-A
Country	US
Kind code	B2
Filing date	Mar 24, 2014
Priority date	May 30, 2007
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

One aspect of the invention provides a component 112, 165 for a fluid dispenser 110 which defines a dosing chamber 120 for a piston member 114 to stroke in and has an end 160 adapted for engaging a fluid outlet 152 of the fluid dispenser or a seal 154 which overlies the fluid outlet 152 to selectively close and open the fluid outlet 152 or seal 154 . Other aspects are disclosed herein.

First claim

The invention claimed is:

1. A fluid dispenser for use with a fluid supply, the fluid dispenser having:
a metering chamber with an end wall at a forward end thereof and a side wall which extends in a forward-rearward direction, and
a piston mounted to reciprocate forwardly and rearwardly in the metering chamber towards and away from the end wall, respectively, the piston having:
a seal to sealingly slide on the side wall of the metering chamber, wherein:
a rearward stroke of the piston enables the metering chamber to fill with fluid from the fluid supply and a forward stroke of the piston pumps fluid present in front of the piston out of the metering chamber,
the seal is in sealing contact with the side wall of the metering chamber in all of the forward stroke of the piston in the metering chamber so that in use the forward stroke of the piston seals-off fluid in the metering chamber in front of the seal and pushes the fluid forwardly towards the end wall, and
the seal is adapted in use to come out of sealing contact with the side wall of the metering chamber during the rearward stroke of the piston as it is in the metering chamber to enable fluid to flow forwardly past the seal into the metering chamber in front of the piston.

2. The dispenser of claim 1 , where the seal is a lip seal which is adapted to deflect inwardly during the rearward stroke.

3. The dispenser of claim 1 , wherein the seal is located at a forward end of the piston.

4. The dispenser of claim 1 , wherein the seal is a seal member which is carried by the piston.

5. The dispenser of claim 4 , wherein the seal member is in the form of a cap mounted on the forward end of the piston.

6. The dispenser of claim 1 , wherein the seal presents a resilient, annular sealing lip which is sized relative to the metering chamber so as to be biased into sealing engagement with the side wall.

7. The dispenser of claim 6 , adapted for use with a fluid supply such that the rearward stroke of the piston creates a pressure difference across the sealing lip which is able to cause the sealing lip to deflect inwardly to create a space between the sealing lip and the side wall of the metering chamber for fluid to flow forwardly past the seal into the metering chamber.

8. The dispenser of claim 7 , wherein the metering chamber is a forward section of a dosing chamber, wherein the dosing chamber further comprises a rearward section, and wherein the forward and rearward sections are of different widths, the forward section being narrower than the rearward section and located in a forward direction relative to the rearward section.

9. The dispenser of claim 8 , wherein the seal has an outer dimension which is less than the width of the rearward section and the rearward stroke results in the piston being positioned in a rearward position in which the seal is located in the rearward section of the dosing chamber so that the forward and rearward sections of the dosing chamber are in fluid communication.

10. The dispenser of claim 9 , wherein in the rearward position of the piston there is an annular space around the seal.

11. The dispenser of claim 9 , wherein the dosing chamber is provided with at least one fluid flow channel extending from the rearward section to the forward section and, in the rearward position of the piston, the seal is adjacent the at least one fluid flow channel.

Assignees

• Glaxo Group Ltd
• Meadwestvaco Calmar Gmbh

Inventors

• Collins James Terence
• Gratzfeld Thomas Franz Paul
• Harms Heiko
• Hertrampf Werner
• Lintern Richard David
• Niebecker Gerdhard
• Pearson Allen John
• Rand Paul Kenneth
• Waitz Karl Heinz
• Welp Karl Gisbert

Classifications

• B05B11/107

  Gate valves; Sliding valves · CPC title

• B05B11/1056

  comprising rotatable or articulated levers (B05B11/1053 takes precedence; lever actuated piston pumps B05B11/1009; lever actuated pumps with deformable chamber B05B11/1029) · CPC title

• B05B11/007 Primary

  being opened by deformation of a sealing element made of resiliently deformable material, e.g. flaps, skirts, duck-bill valves · CPC title

• B05B11/1021

  having an outlet valve which is a gate valve (B05B11/1023, B05B11/1038 take precedence) · CPC title

• B05B11/1014

  the pump chamber being arranged substantially coaxially to the container · CPC title