05299448 is referenced by 54 patents and cites 9 patents.

A positive pressure test apparatus for fit testing a facepiece respirator having an exhalation valve, including a cover portion having a central bore with an inwardly directed shoulder at the base. A plunger is provided having a stem, a button portion on one end and a flange portion on the opposite end. The stem is situated within the central bore, the button portion extending above the surface of the cover portion in a rest position, and the flange portion extending below the inwardly directed shoulder. Bias means are located in engagement with the button portion and the shoulder for biasing the plunger from the rest position to a depressed position, wherein the button is flush with the surface of the cover portion and the flange portion seals the exhalation valve. A mounting means is provided to attach the positive pressure test apparatus to the respirator.

Title
Positive pressure test apparatus for facepiece respirator
Application Number
8/27218
Publication Number
5299448
Application Date
March 5, 1993
Publication Date
April 5, 1994
Inventor
Keith Simpson
Farnham
GB
Joseph Z Zdrok
Webster
MA, US
Richard D Maryyanek
Northbridge
MA, US
Agent
Harry J Gwinnell
Michelle B Lando
Assignee
Cabot Safety Corporation
MA, US
IPC
G01M 3/36
View Original Source