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专利名称：Method and apparatus for assembling a
screw and compressible washer
发明人：BARTH; GERALD DEAN,WAGNER; DAVID
PRUGH
申请号：US47450274申请日：19740530公开号：US3906567A公开日：19750923
摘要：A method and apparatus for assembling a screw and an axially compressiblewasher and rolling threads on the screw blank in a single operation that results in a shankconfiguration immediately beneath the head of the screw that allows complete
compression of the washer. The method involves assembling a washer on the blank andretaining it thereon while the washer and screw assembly are subjected to swaging forcesfrom opposing reciprocating thread rolling dies. The washer is retained on the blank insuch a manner as to allow the thread rolling dies to swage an upper section of the blankand thereafter move the washer upwardly directly adjacent the head in a single threadrolling pass.
申请人：ILLINOIS TOOL WORKS INC.
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