IT1040015B - Self tapping screw for sheet metals - has pyramid type point piercing sheet and forming lip prior to tapping
- Google Patents
Self tapping screw for sheet metals - has pyramid type point piercing sheet and forming lip prior to tapping
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Publication number
IT1040015B
IT1040015BIT2568575AIT2568575AIT1040015BIT 1040015 BIT1040015 BIT 1040015BIT 2568575 AIT2568575 AIT 2568575AIT 2568575 AIT2568575 AIT 2568575AIT 1040015 BIT1040015 BIT 1040015B
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Application filed by Hirabayashi FumiofiledCriticalHirabayashi Fumio
Priority to IT2568575ApriorityCriticalpatent/IT1040015B/en
Application grantedgrantedCritical
Publication of IT1040015BpublicationCriticalpatent/IT1040015B/en
The self tapping screw is of the conventional type but its point has the form of a four-sided pyramid. For the first portion (15) (approx. 1/3) of the point the sides meet to give sharp edges (16) but along the remainder 17, this edge is removed by an increasing radius (18). A hole is formed by pressing the screw through the sheet (19), the angled faces forming the metal into a lip (21) to give an extended thread length. The thread is formed, conventionally, by rotating the screw clockwise with a downward pressure.
IT2568575A1975-07-231975-07-23Self tapping screw for sheet metals - has pyramid type point piercing sheet and forming lip prior to tapping
IT1040015B
(en)