| 摘要 |
A spin- or thread-on type oil filter whose filter housing which mounts within its interior space the filter element or cartridge comprises a cylindrical, thin sheet-metal shell or can body closed at one end by an integral dome-shaped end wall and at its other end by a separately fashioned closure plate assembly made up of a heavy-gauge metal base plate whose outer rim portion is planar and has diameter substantially equal to the inner diameter of the shell, and an annular sheet metal seaming cover which is lock-seamed along its outer peripheral or rim portion to the open-end wall portion of the shell and extends radially inwardly therefrom and in flush engagement with the under (outer) face of said base plate, the improvement comprising radially inwardly directed circumferential beads or formations rolled or otherwise provided in the cylindrical wall of the shell at locations immediately above (axially inwardly of) and below (axially outwardly of) the base plate, said circular beads serving as lock-shoulders which lock the base plate against movement in either axial direction relative to the shell and/or seaming cover.
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