초록 ▼

An engine oil filter has an upper cap and a lower case or plate, which are engageable with each other through a projecting portion and a groove portion. In one mode, the projecting portion is inserted into a first longitudinal groove wall and moved along a contact surface of a first skewed groove wa

An engine oil filter has an upper cap and a lower case or plate, which are engageable with each other through a projecting portion and a groove portion. In one mode, the projecting portion is inserted into a first longitudinal groove wall and moved along a contact surface of a first skewed groove wall, whereby the cap and the case are moved and fitted together in an axial direction. As axial movement caused by relative rotation between the cap and the case takes place, an O-ring is tightly fitted therebetween at a fixed seal position. This engagement process applies no excessive force to the O-ring so that a sealed state of high reliability is provided.

대표청구항 ▼

[ What is claimed is:] [1.] A casing for an element exchange type filter, said casing comprising:a pair of casing portions for exchangeably housing therein an element assembly having a filter element;a pair of restraint means for restraining said casing portions at a restraint position when said cas

[ What is claimed is:] [1.] A casing for an element exchange type filter, said casing comprising:a pair of casing portions for exchangeably housing therein an element assembly having a filter element;a pair of restraint means for restraining said casing portions at a restraint position when said casing portions are engaged with each other;a pair of guide means for guiding engaging movement of said casing portions toward said restraint position, said guide means having a non-through skew guide portion for gradually axially moving said casing portions when said casing portions are relatively rotated for engagement;wherein said guide means includes a projecting portion provided on one of said casing portions, and a skew guide wall defining a groove portion thereon as said skew guide portion provided in the other of said casing portions to guide said projecting portion on contact therewith;a seal member interposed radially between said casing portions;one of said casing portions is formed with a mounting portion for holding an O-ring as said seal member;the other of said casing portions is formed with a seal surface for pressing contact with said O-ring, and a taper surface positioned on an opening side from said seal surface so that said O-ring is pressed gradually as said casing portions are moved axially with respect to each other; andsaid taper surface is defined not to press substantially said O-ring radially until said casing portions are moved along said skew guide portion.