Abstract: The invention is an air purifying apparatus having an air inlet plenum (22, 140) mounted to a filter canister (21) and containing a bypass (63, 157). A barrier (52, 147) divides the inlet plenum (22, 140) into an inlet chamber (53, 150) and an outlet chamber (54, 151). In one embodiment the bypass is formed as a box (63) attached to the plenum (22) and containing openings (70, 71) which communicate respectively with the inlet chamber (53) and the outlet chamber (54) to define a bypass flow path from the inlet chamber (53), through the box (63) and into the outlet chamber (54). In another embodiment the bypass is formed as an opening (157) in the barrier (147) to allow direct communication between the inlet (150) and outlet (151) chambers.

Abstract: A filter assembly (10) for the filtration of toxic gases from the air is disclosed, which includes a unitized cylindrical housing having oppositely disposed end covers (11, 12), with an inlet port (11a) in one end cover and an outlet port (13a) in the side wall. An annular, pleated filter element (21) extends between the end covers (11, 12) between perforated liners (18, 19), and a third, perforated liner (20) is spaced outwardly from the center or common liner (19) to provide an annular space therebetween which is filled with activated charcoal (27). Fines media (25, 26) are positioned on opposite sides of the activated charcoal (27). The first, pleated filter (21) and the second, charcoal filter (27) are thus mounted contiguous to one another on opposite sides of separating wall (19, 25), and extend between the end covers (11, 12) to provide filtration for air being drawn through the filter unit.

Abstract: An auger construction is provided which reduces the surface noise radiated by the auger and serves to at least partially isolate the auger from the remainder of the machine. The auger construction comprises an inner shaft and outer concentric shafts, the latter carrying the helical cutting blade and generally corresponding to the shaft of a conventional auger. An elongated annulus of noise and vibration dampening material is disposed between the inner and outer shafts. Preferably, the outer shaft is isolated from the machine by further noise dampening material disposed between the mounting flange and the proximate end of that shaft and between the free end of the inner shaft and the end of the hose in the outer shaft. A bore in the inner shaft is also filled with noise dampening material. A number of arrangements are disclosed for fixing the two shafts together so as to prevent rotational slippage therebetween.

Abstract: A reversed air system for periodically cleaning one or more filter panels an engine air cleaner. The cleaner system includes an air nozzle at one face of the filter panel and an air receiver at the other panel face. The nozzle and receiver are arranged on ball screws for transverse movement across the filter panel faces. Under our invention, the air receiver has flexible connections with ball nuts that travel along the associated ball screws. The flexible connections have swing flexibility in different planes to alleviate potential jamming tendencies due to manufacturing tolerances, installation variances, and ball screw sag due to the unsupported length of each screw.

Abstract: A control mechanism for apparatus for cleaning of fluid filters by a jet of fluid directed toward a filter in a direction reversed to that of the flow of fluid to be filtered through the filter element. An elongated manifold extends across the downstream or clean fluid delivery side of the filter element, and has a plurality of aligned apertures extending longitudinally of the manifold and facing the adjacent side of the filter element. A plurality of valve elements are mounted in the manifold for movement toward and away from closing relationship with the apertures, and are yieldingly urged toward closing relationship with their respective apertures. A rotary cam shaft is journaled in the manifold and includes a plurality of cams each associated with a different valve element. A pawl and ratchet arrangement is operative to open each of the valves in succession responsive to movement of the manifold across the side of the filter element.