Relief screw

Details Relief screw Relief screw

1994-10-17

1996-05-21

Wilson, Neill R.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Externally threaded fastener element, e.g., bolt, screw, etc.

Head having counter-sinking means

411188, 411959, F16B 2300, F16B 3506

Patent

active

055183522

ABSTRACT:
An improved relief screw is provided for installing a wallboard panel to a stud, which consists of a flat head made of an inverted rectilinear slant height frustrum portion and a straight thin cylindrical portion. The straight thin cylindrical portion is larger than the widest part of the rectilinear slant height frustrum portion, therefore creating an annular flange thereabout. A threaded shank with a conical point extends from a narrow part of the rectilinear slat height frustrum portion, while the flat head bas a recess to accommodate a driving tool element for imparting rotary motion thereto. A structure is in the flat head for relieving particles of the wallboard panel therefrom, after the flat head is driven into the wallboard panel. The top of the straight thin cylindrical portion will be flush with and not damage the outer surface of the wallboard panel, while the annular flange will add more gripping support thereto.

REFERENCES:
patent: 1238636 (1917-08-01), Christofferson
patent: 2199809 (1940-05-01), Pigott
patent: 2764053 (1956-09-01), Lovisek
patent: 3056234 (1962-10-01), Nelsson et al.
patent: 3177755 (1965-04-01), Kahn
patent: 3903784 (1975-09-01), Dekker
patent: 4653244 (1987-03-01), Farrell
patent: 5199839 (1993-04-01), DeHaitre

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