| 摘要 |
796,475. Oil filters. FRAM CORPORATION. Oct. 18, 1956 [March 1, 1956], No. 31735/56. Class 46. [Also in Group XXII] An oil filter of the screw-on, throw-away type comprises a cup-shaped shell having an end wall and integral side walls extending the entire length of the shell and supporting the entire fluid pressure on the end, a sheet metal closure for the other end of the shell sealed to the side walls, a filter cartridge within the shell, and a reinforcing plate inside the shell and contacting the closure, the plate having a central opening surrounded by internal threads by which it may be screwed on to a projection to secure the filter in its operative position. A cup-shaped casing 10 locates within itself, by ribs 12, a flange 17 on an end plate 15 secured to a pleated filter 14 surrounding a perforated tube 19 the upper end of which encircles a cover 21 supporting a spring 22 and carrying a by-pass valve 48. The spring presses the filter down on to a thick metal reinforcing plate 27 which abuts the wall of the casing 10 to provide a backing when a turned over joint 25, 26 is made between the casing and an end wall 24. The centre of the plate 27 is formed as a screwed sleeve 28 to adopt the casing to be screwed on to a bush 34 whose upper end 35 engages a bottom cover 23 for the tube 19 to lift the filter off the plate 27 and thereby provide a passage for oil to the exterior of the pleats 14. Oil enters this passage through ports 42 in the plate 27, these ports co-operating with ports 41 in an adaptor plate 37 which makes fluid tight contact with the plate 27 through a packing ring. The space beneath the adaptor plate 37 communicates with an annular recess 32 in the engine block of an internal combustion engine, a conduit 30 connecting the recess with the oil sump. A plate 46 having a single aperture 47 divides the space beneath the adaptor 37 to prevent loss of oil if the filter unit is mounted in a tilted position. The bush 34 is hollow and connects the central tube 19 with a passage 31 in the block 29 and leading to the engine bearings. A flange 36 on the bush 34 clamps the adaptor plate 37 and plate 42 to the block 29. The reinforcing plate may be flat and a packing ring be disposed in an outwardly facing recess in the end wall 24 ; a flat disc of rubber lies on the plate 27 above the ports in the plate to form a non-return valve which prevents escape of oil from the filter.
|
