Vacuum cleaner, operated by compressed air

Claim 1

A pressurized air-operated vacuum cleaner apparatus having an ejector device with nozzle means and appurtenant venturi means for creating a vacuum in an oil drum type container, said ejector device including an inlet passage for conducting suction air and entrained debris from a location outside said container into said container and an outlet passage for conducting air from said container, said nozzle means being mounted in said outlet passage upstream from said venturi means, means for supplying high pressure operating air to said nozzle means for ejection thereof downstream into said venturi means to produce said vacuum, said container including an open plug hole and a closed plug hole, the improvement comprising, an elongated housing enclosing said ejector device and being mounted with a sealing fit through said open plug hole, said elongated housing including a first opening in a first end portion thereof extending into said container and a second opening at a second end portion thereof extending outwardly of said container, said elongated housing further including a third opening adjacent said first opening and a fourth opening in a side wall of said elongated housing outside of said container, said outlet passage extending between said first and second openings and said inlet passage extending between said third and fourth openings.