PURPOSE: To enable a body to be quickly attached and detached and also to easily form a joining part and to enhance durability thereof by screwing a member fitted with a male screw into a ring fitted with the female screw which is insertably fixed to a circular hole provided to a hole bored in the part fitting the body.
CONSTITUTION: A stepped hole 3 having a large-diameter circular hole 3a is bored in the part of a tube plate 1 fitted with a filter element 2, and the following ring 4 fitted with a female screw is insertably fixed to the large-diameter circular hole 3a which has an outer periphery inserted and clamped into this hole 3a and has inner diameter larger than the diameter of a flange 2a of the element 2 so that the element 2 is enabled to pass through it and is engraved with the female screw 4a in the inner periphery. The male screw engraved in the flange 5a of the following ring 5 fitted with a male screw is screwed into the above-mentioned female screw 4a which has the male screw engraved in the outer periphery of the flange part 5a and is integrally provided with both a cylindrical part 5b having a diameter loosely fitted to an intermediate hole 3c and the flange 5a. The element 2 is fixed to the tube plate 1 by pressing the element 2 to the stopped part 6 of the stepped hole 3 by means of the ring 5.
AJIRO MASAYUKI
KURAMOTO KINZO
TSUKAHARA SHIGEJI
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