Brushing – scrubbing – and general cleaning
Patent
1976-03-10
1977-08-09
Britts, Ramon S.
Brushing, scrubbing, and general cleaning
10 10R, 72 88, 151 22, B21D 1704, F16B 2500, F16B 3930
Patent
active
040403289
ABSTRACT:
A thread-forming screw has a work-entering section for forming a thread in a workpiece and a work-holding section adjacent thereto. Both sections are of an arcuate, polygonal lobular configuration in cross-section. The amount of lobulation on the holding section is considerably less than the lobulation on the work-entering section, which is of such magnitude as to insure effective thread-forming at low torque. The lobulation on the holding section is preferably just sufficient to effect a locking action with the thread of the workpiece and also to improve the stripping torque of the screw from the workpiece. The work-entering end of the fastener also has a pilot thread of about one turn and with a uniform width over 360.degree. and sized approximately the same as the pilot hole in the workpiece to prevent cocking of the fastener as it is initially inserted into the pilot hole. Thread-rolling dies for forming the fastener have a die section with grooves of equal depth to roll the pilot thread.
REFERENCES:
patent: 3180126 (1965-04-01), Carlson
patent: 3195156 (1965-07-01), Phipard
patent: 3681963 (1972-08-01), Muenchinger
patent: 3918345 (1975-11-01), Phipard
Britts Ramon S.
Research Engineering & Manufacturing, Inc.
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