Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Internally threaded fastener element – e.g. – nut – etc. – Multipart
Patent
1996-10-09
1998-01-13
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Internally threaded fastener element, e.g., nut, etc.
Multipart
411437, 411366, 411527, F16B 3708, F16B 3716
Patent
active
057071934
ABSTRACT:
An object engaging mechanism includes a screw-fitting clip and a tapping screw to which said screw-fitting clip is to be fitted. The screw-fitting clip includes a plurality of elastic engaging claws protruding radially from an edge of a center hole of an annular disk at an inclined angle relative to a surface of the annular disk, and a plurality of protruding pieces arranged on an outer peripheral portion of the annular disk and extending away from the annular disk on a same side as the elastic engaging claws. The tapping screw comprises a plurality of ridges and has a thread profile such that a first side of the ridges facing a shank end of the tapping screw is an outwardly convex curved flank, and a second side of the ridges is a gently inwardly concave curved flank. The elastic engaging claws of the screw-fitting clip have tips which are formed with bent end portions corresponding to the thread profile of the tapping screw, and the screw-fitting clip and the tapping screw engage an object therebetween by a forcible pushing operation whereby the shank end of the tapping screw is inserted through the center hole of the annular disk of the screw-fitting clip until a bearing surface of the annular disk reaches the object to be engaged, and the tips of the elastic engaging claws of the screw-fitting clip are fitted between the ridges of the tapping screw against a base portion of the inwardly concave curved flank of the ridges.
REFERENCES:
patent: 2969705 (1961-01-01), Becker
patent: 3207022 (1965-09-01), Tinnerman
patent: 4600344 (1986-07-01), Sutenbach et al.
patent: 4784553 (1988-11-01), Spat
patent: 4911594 (1990-03-01), Fisher
patent: 5190424 (1993-03-01), Kazino et al.
Threads and Thread Ends for Tapping Screws; JIS B 1007; 1987; pp. 357-364.
Aoyama Seisakusho Co., Ltd.
Wilson Neill R.
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