Patent GB-875510-A (GB)
Title: A device, including air filtering means, for use in an air supply line
IPC: F16N7/32
Filed: 1958-12-08
Abstract: 875,510. Air line oilers. REGIE NATIONALE DES USINES RENAULT. Dec. 8, 1958 [Dec. 13, 1957; Sept. 1, 1958], No. 39478/58. Class 12 (3). In an air filtering and oiling device a filtering unit 1, Fig. 1, extracts impurities from the air by shock followed by filtering through a cylindrical filter 8 and the cleaned air is then directed along a passage 17 of a manifold 4 in which an oil-dispensing jet 26 is mounted, the jet being connected to an oil cylinder 20 by a tube 25, the latter having a non-return valve comprising a seal 53 with lips 56 which are moved to the open position by oil forced through a passage 57 connected to the cylinder 20. The cylinders 1, 20, which may be made from reinforced plastic material, are joined by the manifold 4 and have lower cups 5, 38, with draining plugs 35, 36, screwed therein. The cylinder 1 contains a tube 7 screwably attached to the manifold 4 and to the cup 5, and contains the filter 8 supported by a resilient sleeve 12 which also serves as a seal by abutting an extension 15 of the cup 5. The filter 8 is made of fine mesh gauze and is carried by a member 9 having a thread 10 which serves to increase its strength and imparts a helical motion to the air. Air enters the cylinder 1, through an inlet orifice 19, and is accelerated by the thread 10 so that it impinges against the walls of the cylinder to remove heavy particles which fall to the bottom and may be removed by unscrewing the drain-plug 35; the partly-cleaned air passes through the filter 8 and rises through an annular space 16, between the filter and the tube 7, which connects to the passage 17. Some of the air then passes through an orifice 42 and into a chamber 41 of the cylinder 20 so as to exert pressure on the oil therein which is forced along a passage 30 in the cup 38, through the non-return valve 56 and up a wick in the tube 25 to the jet 26. The portion of the jet extending into the passage 17 has a crosssectional shape comparable with a figure 8, Fig. 3, and two lateral holes 29 are formed across the smallest distance across the " 8," the holes 29 being connected to the axial hole in the jet. The air stream in the passage 17 causes a partial vacuum adjacent the holes 29 and an oil mist, drawn from the jet mixes with the air and passes through an outlet orifice 18 and the discharge of oil is regulated by a needle 31 held in position by a screw 32 in a screw-threaded hole 33 in the manifold 4. The wick is retained in the tube 25 by a rod 51 having flanges 50, the rod also urges the rounded end 54 of the seal 53 against the plug 36 and oil is supplied to the cylinder 20 through a cup 39 which has two passages 40, Fig. 2, connecting to the chamber 41 and a venting hole 55 is provided in the cup 39. A plug 37 is screwed into the cup 39 after the filling has taken place and holes 44, in the plugs 35-37 allow control of the inner pressure without removal of the plugs. In a modification, Fig. 4, the brass tube 25 is replaced by a plastic tube 60 which, having an integral rod 62 with a rounded end 63, forces the seal 53 against the plug 36; the bottom of the tube 60 has holes to allow the oil to rise to the jet. The filtering and oiling portions are separate units and have screwthreaded holes 65, 66 for connection purposes. In a further modification, Fig. 8, air is fed through an inlet pipe 67 and, being prevented from directly entering a filter 68 by a screened portion thereof, is diverted towards the inner wall of a chamber 69 to remove the large impurities and the partly-clean air flows up a passage 72, passes a jet 73 and escapes through an outlet 74. An oil reservoir 75 is positioned above the jet 73 and oil flows through orifices 76 to the jet and a pipe 77 from the passage 72 transmits air pressure to the oil level. In another modification, not shown, the cylinders 1, 20 are reinforced by perforated sheet metal elements. In another modification, not shown, air pressure is supplied to the oil via the filler cup 39. A modified needle may be provided having a centralizing portion engaging the axial bore of the jet; the needle may extend through the plug 37 to allow external adjustment thereof and a toroidal gasket positioned between the plug 37 and the needle prevents leakage.