Threaded – headed fastener – or washer making: process and apparat – Process – Making headed fastener – e.g. – rivet or nail – etc.
Patent
1994-06-20
1998-12-22
Larson, Lowell A.
Threaded, headed fastener, or washer making: process and apparat
Process
Making headed fastener, e.g., rivet or nail, etc.
247112, 163 6, 411498, B21G 316
Patent
active
058511539
ABSTRACT:
A steel pin is disclosed of a type to be forcibly driven into a steel substrate by using a powder-actuated tool. The steel pin has a substantially cylindrical shank and a substantially sharp point which extends from one end of the substantially cylindrical shank, which conforms substantially to a tangent or secant ogive except for a substantially spherical tip having a radius in a range of approximately 0.02 inch (approximately 5 millimeters) to approximately 0.03 inch (approximately 7.5 millimeters), which has substantially true concentricity, which has surface-texture irregularities with a roughness-height index value in a range from approximately 10 microinches (approximately 0.25 micrometers) to approximately 15 microinches (approximately 0.38 micrometers), and which appears to be substantially free of other surface imperfections when viewed under 60.times. magnification. The substantially cylindrical shank is joined to the substantially sharp point at a transition having a substantially smooth, continuously curved surface, and is knurled near the transition. The steel pin is made by deforming a length of steel wire as by forging or swaging, so as to form the steel pin with the substantially cylindrical shank and with the substantially sharp point, and reshaping the substantially pointed end as by barrel finishing the steel pin in a finishing medium.
REFERENCES:
patent: 272600 (1883-02-01), Taylor
patent: 1209824 (1916-12-01), Eldred
patent: 5181886 (1993-01-01), Van Allman et al.
ASTM Standard Specification for Structural Steel (1969) at pp. 78-81 (Specification A36-69).
Baumeister et al., Marks' Standard Handbook for Mechanical Engineers, Eight Edition, McGraw-Hill Book Company, New York (1978) at pp. 13-73 through 13-79.
ASTM, 1993 Annual Book of ASTM Standards, Index Phil. pa., (1993).
Heflin William M.
Mc Connell Ronnie L.
Syvarth James H.
Van Allman Don T.
Illinois Tool Works Inc.
Larson Lowell A.
Schoeffler Thomas C.
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