PISTON HEAD WITH SEALING ARRANGEMENT

• US 20130068095A1
• Filed: 05/24/2011
• Published: 03/21/2013
• Est. Priority Date: 05/26/2010
• Status: Abandoned Application

• Current Assignee: GE Healthcare Bio-Sciences AB (GE Healthcare Technologies, Inc.)
• Original Assignee: GE Healthcare Bio-Sciences AB (GE Healthcare Technologies, Inc.)
• Inventors: Johansson, Bjorn A., Akerstrom, Patrik
• Application Number:
  US13/699,750
• Publication Number:
  US 20130068095A1
• Time in Patent Office: Days
• US Class Current: 92/208
• CPC Class Codes: B29D 99/0053 Producing sealings B29D99/0085 takes precedence
• CPC Class Codes: F16J 1/008 with sealing lips
• CPC Class Codes: F16J 1/04 Resilient guiding parts, e.g. skirts, particularly for trunk pistons
• CPC Class Codes: F16J 1/22 with universal joint, e.g. ball-joint

Abstract

A sanitary piston head with a body, said piston head having a fluid-contact end and a drive end and comprising a resilient sealing skirt arranged to provide sealing abutment against the inner wall of a cylinder when said piston head is inserted in said cylinder, wherein the resilient sealing skirt is biased in the sealing direction by a radially biasing element.

Claims

1. A piston head (1) with a body (7), said piston head having a fluid-contact end (4) and a drive end (5) and comprising a resilient sealing skirt (6) arranged to provide sealing abutment against the inner wall (9) of a cylinder (3) when said piston head is inserted in said cylinder, wherein the resilient sealing skirt is biased in the sealing direction by a radially biasing element (8).

2. The piston head of claim 1, wherein the resilient sealing skirt extends in the direction towards the drive end.

3. The piston head of claim 1, wherein the radially biasing element is supported by the piston head body.

4. The piston head of claim 1, wherein the resilient sealing skirt is part of a piston cap (11).

5. The piston head of claim 1, wherein the resilient sealing skirt and the fluid-contact end are integrally formed with the body.

6. The piston head of claim 1, wherein the radially biasing element comprises an elastomer.

7. The piston head of claim 1, wherein the radially biasing element comprises an O-ring.

8. The piston head of claim 1, wherein the radially biasing element comprises a metal spring.

9. The piston head of claim 1, wherein the radially biasing element is co-molded or insert molded with the piston head.

10. The piston head of claim 1, wherein the piston head is attached to a piston rod (2).

11. The piston head of claim 10, wherein the drive end of the piston head is attached to a piston rod via a hinge (10) allowing up to 10 degrees deflection of the piston head.

12. A method of manufacturing the piston head of claim 1, further comprising a step of co-molding or insert molding.