| 摘要 |
A thin-walled metal sleeve (7), which can be screwed into the fitting element (A) in place of a conventional insertion connector of the latter, is provided with a plurality of peripheral grooves (3) and with planar outer surfaces (4) which are tangent to the base of the groove. A retaining ring (5), the ring opening (5a) of which corresponds to the cross-section of the sleeve (7) in the region of the webs (6) which separate the peripheral grooves (3), can be slipped over the sleeve (7). The retaining ring (5) can be fixed on the sleeve (7) in the manner of a bayonet catch by twisting. The fitting (A) can be clamped to the upper side of the plate by means of screws (8) inserted in threaded holes (5a) of the retaining ring (5). <IMAGE>
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