Latching and sealing device
AssigneesPeter J. Balsells, Joan C. Balsells
InventorPeter J. Balsells
Life of this patent
Estimating the term…
Abstract
A latching and sealing device suitable for use as a cover seal for a plunger or piston in a syringe or plunger pump includes a cylindrical seal member having a body portion and lip-and-latch means for both sealably engaging a surrounding surface and latching to the piston. A spring disposed in between the lip-and-latch means and the piston provide a constant sealing pressure while allowing the piston and seal member to be moved within a bore. Sealing between the lip-and-latch means and the bore is enhanced by use of a berm and notches radially aligned with the biasing spring.
Claims18
A latching and sealing device comprising:
- a cylindrical seal member comprising a body portion and lip-and-latch means flexibly depending from said body portion and adapted, for both sealably engaging a surrounding surface and latching to a cylindrical core, said lip-and-latch means including groove means formed on an inside surface of said lip-and-latch means for supporting a spring therein;
- a cylindrical core including means defining a circumferential groove therein for supporting a spring;
- and,
- spring means disposed between the lip-and-latch means and the cylindrical core, and within the lip-and-latch means groove and circumferential groove, for radially forcing the lip-and-latch means into engagement with a surrounding surface and acting in cooperation with the lip-and-latch means groove and circumferential groove to axially lock the cylindrical seal member to the cylindrical core.
A latching and sealing device comprising:
- a cylindrical seal member comprising a body portion and lip-and-latch means flexibly depending from said body portion and adapted for both sealably engaging a surrounding surface and latching to a cylindrical core, said lip-and-latch means including first and second groove means formed on an inside surface of said lip-and-latch means, each first and second lip-and-latch groove means being operative for supporting a first and second spring therein, respectively;
- a cylindrical core including means defining a first and a second circumferential groove therein for supporting the first and second spring therein, respectively;
- first spring means disposed between the lip-and-latch means and the cylindrical core and within the first lip-and-latch groove and the first circumferential groove for radially forcing the lip-and-latch means into engagement with a surrounding surface and acting in cooperation with the first lip-and-latch groove and the first circumferential groove to axially lock the cylindrical seal member to the cylindrical core;
- and
- second spring means disposed between the lip-and-latch means and the cylindrical core and within the second lip-and-latch groove and the second circumferential groove for radially forcing the lip-and-latch means into engagement with a surrounding surface and acting in cooperation with the second lip-and-latch groove and the second circumferential groove to axially lock the cylindrical seal member to the cylindrical core.
Dependencies are inferred from the claim text.