Patent ID: 6676386
Filing Date: 2004-01-13
Classification: F01B,F02B,F04B

Abstract:
An air motor apparatus comprising:(a) a body having a bore; (b) an air cylinder that extends from said body and opens to said bore, (c) a first manifold, a second manifold, a third manifold, an air inlet port that leads to the first manifold, an air exhaust port that leads to the second manifold, and at least one passageway that leads from the third manifold and opens into the upper end of the air cylinder; (d) an air piston in said cylinder provided with a hollow stem operative in the body bore and having ports opening through the bottom thereof, (e) a slide valve and valve sleeve disposed in the bore about the air piston, said slide valve sleeve being moveable between an upper position and a lower position, said slide valve sleeve providing communication; i. between the air inlet and the body bore and between the air exhaust and the upper portion of the air cylinder via the passageway, when the slide valve is in one of said positions; and, ii. between the air inlet and the upper end of the air cylinder via the passageway and between the body bore and the air exhaust, when the slide valve is in the other of said positions; (f) a pilot valve disposed within the slide valve, the pilot valve having an axial bore with a piston at one end, said pilot valve being shiftable by air pressure from the inlet entering the body bore, as controlled by the slide valve; (g) a first check valve carried by the pilot valve to allow air to be received through the ports of the air piston; (h) a second check valve carried by the pilot valve to allow air to pass from beneath the air piston into the body bore; (i) a dry seal member disposed between the slide valve and the valve sleeve; and (j) dry seal retaining apparatus which prevents the seal member from migrating upwardly on the slide valve.