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
1987-06-30
1989-01-10
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...
411310, 411324, 411438, 411533, F16B 3900, F16B 3712
Patent
active
047970456
ABSTRACT:
Formation of a screw thread in a mounting hole in furniture hardware made by the stamping and pressing process from thin sheet metal, which can be fastened to the furniture wall by means of mounting screws driven through the mounting hole into a furniture wall. The shaft of the mounting screw has at its head end a threadless section with a diameter smaller than the outer diameter of the thread. The mounting hole has a free passage cross section which is smaller than the outside diameter of the thread spirals of the mounting screw, and a ring-like section of the material surrounding the free passage cross section is bent to form a thread spiral extending over more than 180.degree., preferably more than 270.degree., but no more than 360.degree., with a pitch corresponding to the pitch of the mounting screw thread, a portion of the section of material forming the thread spiral being cut free from the surrounding material of the hardware piece along an arcuate boundary line.
REFERENCES:
patent: 1778368 (1930-10-01), Monnier
patent: 3036673 (1962-05-01), Santerre
patent: 3723941 (1973-03-01), Schumacher et al.
patent: 3892031 (1975-07-01), Bisbing
patent: 3982575 (1976-09-01), Ollis, Jr. et al.
Lautenschlager Gerhard
Lautenschlager, Jr. Karl
Karl Lautenschlager GmbH & Co. KG
Wilson Neill R.
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