Resources Contact Us Home
Assymetrically shaped thread forming screw and method of making same

Image Number 3 for United States Patent #4534690.

A thread forming screw made from a blank which has a tip with an assymetrical cross-section comprised of two oppositely disposed inner surfaces which gradually merge with two oppositely 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 workpiece material upon insertion and axially advancing rotation in a bore. The reduced frictional contact is achieved because of substantial 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.

  Recently Added Patents
Rule-based stimulation program search
LO generation with deskewed input oscillator signal
Cryptography on a simplified elliptical curve
Electronic component and a system and method for producing an electronic component
Temporary protective cover for an exposed junction box
Apparatus with a local timing circuit that generates a multi-phase timing signal for a digital signal processing circuit
Stepped delay control of integrated switches
  Randomly Featured Patents
Method and system to verify the identity of a user
Bidirectional direct current power conversion circuits and methods
Paper set feeder
Utility knife that protrudes a blade from a stored stack of blades
Methods of producing polyarylamines and using them for detackifying paint and removing color from aqueous systems
Method of fabricating inductor and structure formed therefrom
Adjustable charge bar
Shielding means for cathode ray tube
Machine and process for leveling sheet metal strip
Selective downhole operating system and method