F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
85/110, 10/30
F16B 35/00 (2006.01) B21K 1/56 (2006.01) F16B 25/00 (2006.01)
Patent
CA 1242601
ABSTRACT A thread forming screw made from a blank which has a tip with an assymetrical cross-section comprised of two opposite- ly disposed inner surfaces which gradually merge with two oppo- sitely disposed outer surfaces. The inner surfaces may be arcuate or generally flat or a combination thereof. The inner and outer surfaces are generally parallel to each other and to the axis of the screw so that, when rolled, the tip has generally fully formed sharp crested threads which gradually deform work- piece material upon insertion and axially advancing rotation in a bore. The reduced frictional contact is achieved because of sub- stantial unthreaded portions on the inner surfaces. Improved gripping action results from the formation of full threads which extend substantially the full length of the fastener.
464755
Illinois Tool Works Inc.
Meredith & Finlayson
LandOfFree
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