Ingersoll-rand Company

Frederick H Emilson

Brian D Sowards

The unloader has a piston-operated valving element which opens and closes a compressor, air inlet housing, inlet port to load and unload the associated compressor. A control, pressured air supply is addressed to the piston to cause the latter to translate the valving element into port closure, and in the absence of the aforesaid supply, vacuum pressure and incoming air displace the valving element from closure of the ports. One spring seats the piston, and another moves the valving element into closure when the compressor is shut down, in one embodiment of the invention. A guide rod pilots movements of the piston and valving element. In the combination, the unloader is wholly confined within an aluminum die-cast air inlet housing.

Unloader, and in combination with an air compressor inlet housing

In the arrangement, a gear housing rotatably journals juxtaposed ends of coacting lobed, male and female rotors on a horizontal plane, and a passageway confined in the housing, on a diagonal plane which tranverses the horizontal plane, conducts oil therethrough to rotor-end bearings from an oil-admittance port at an upper end of the passageway. The rotors, then, are below the port, at a lower end of the passageway and, accordingly, the gear housing-supplied oil is scavenged into the rotors. Further, the compressor has an airend which comprises the gear housing, the latter being of aluminum, die-cast formation, having parallel, side faces, with an oil filter mounting coupled to one of the faces. A drive gear, and a therewith meshing driven gear, are supported by the housing. The driven gear is drivingly coupled to the male rotor, substantially centrally in the housing, and the female rotor is journaled in the housing, as noted, outwardly (relative to the housing) from the driven gear and male rotor.

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Lexington, NC, United States of America

Frederick H Emilson