Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Threaded fastener locked to a discreet structure – Member preassembled with substructure at through-passage or...
Patent
1989-04-28
1991-10-22
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Threaded fastener locked to a discreet structure
Member preassembled with substructure at through-passage or...
411353, 411999, F16B 2118, F16B 3900
Patent
active
050590758
ABSTRACT:
A retracting screw assembly 10 for maintaining a screw 12 in the retracted position so that flame proof surface 28 is not scratched during opening and closing cover 18. Retracting screw assembly is comprised of a screw 12 with a threaded portion 34, washer 14, conical spring 16. When threaded portion 34 is disengaged from body portion 26, conical spring 16 pulls screw 12 into a retracted position so that threaded portion 34 rests against shoulder 20.
REFERENCES:
patent: 1927780 (1933-09-01), Anderson
patent: 3018127 (1962-01-01), Dogrosielski et al.
patent: 3056443 (1962-10-01), Knocke
patent: 3263728 (1966-08-01), Lynch
patent: 3295578 (1967-01-01), Maloof
patent: 3437119 (1969-04-01), Dey
patent: 3465803 (1969-09-01), Ernest et al.
Blish Nelson A.
Cooper Industries Inc.
Rose David A.
Wilson Neill R.
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