(57) Abstract Assembly resolution is easy. Constitution As for upper adapter unit 1, 1st and 2nd support framework body 3 and 4The ri facing, to form in one body, 1st, biaxial cylinder 12 and 13As it provides, 1st, biaxial cylinder in the Tip of 12 and 13The 1st small cylinder part 15 which possesses the screw spiral shellfish entrance hole 14 and the screw interposition holeIn the 2nd small cylinder part 17 which possesses 16 and the center screw Interpolation through-hole 18To have the additional strength support board 19 which it possesses, 1st small cylinder part 15 and 2ndIn small cylinder part 17 outer fitting the outer fitting section 20 which is done and, 1st screw 21 facilitiesAs for ke, and lower adapter unit 2, from 1st and 2nd support framework body 3 and 4 phaseConfronting, to form in one body, open the lower part several additional strength pieces 231st and 2nd sudden facilities body 24 of the kamaboko forma which is provided in one body,As 25 is provided, 1st and 2nd sudden facilities body the Tip of 24 and 25In the section the screw spiral shellfish arrival section 27 which possesses the screw spiral shellfish arrival hole 26 and the screwThe outer fitting section 28 which possesses through-hole 28 and in screw spiral shellfish arrival section 27 outer fitting it doesWith, it designated that 2nd screw 30 is provided as feature.
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