Screw with increased driving resistance at proper depth

Details Screw with increased driving resistance at proper depth Screw with increased driving resistance at proper depth

F - Mech Eng,Light,Heat,Weapons

16

B

F16B 39/26 (2006.01) F16B 35/04 (2006.01) F16B 39/282 (2006.01) F16B 43/00 (2006.01) F16B 25/10 (2006.01)

Patent

CA 2183843

A screw for use with a washer as a sealing fastener having formations near the head of the screw to increase driving resistance when the portion having the formations reaches a surface into which the screw is being drilled. The screw includes a shank with a tip end and a head end. A head at the head end may be driven by a driving tool such as a pneumatic or electric drill. To facilitate retention of the washer the head has a flange that forms a recess. The shank has an enlarged portion near the head adjacent to the recess and the enlarged portion has ridges. The enlarged portion, including the ridges, increases the driving resistance of the screw. This increase in resistance gives notice to an operator of the driving tool that an appropriate driving depth and torque have been achieved. Preferably, the washer has an inner diameter surface with fully radiused projections. The projections assist in mounting the washer to the screw and keeping the washer appropriately positioned on the screw during driving of the screw.

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