Patent ID: 6481986
Filing Date: 2002-11-19
Classification: A61M,F04B

Abstract:
An improved vacuum adjustment mechanism for controlling airflow into a chamber which is subject to negative pressure, comprising:an air inlet conduit communicating with the chamber; a channel formed in a base member, said base member channel having a longitudinal length and a dimension perpendicular to said longitudinal length varying from a minimum to a maximum, said base member channel having a channel bottom and being open along a channel top; an airhole formed in said channel bottom at said maximum dimension, said airhole communicating with said air inlet conduit to the chamber; a rotary member rotatably mounted on said base member, said rotary member having an internal channel extending across said longitudinal length of said base member channel and overlying said channel top, said internal channel of said rotary member communicating with an air source; said rotary member when rotated moving said internal channel along said longitudinal length of said base member channel to thereby regulate airflow into said base member channel depending upon where said internal channel is positioned between said minimum and maximum dimensions.