Microdot Inc.

Kaynar Manufacturing Co., Inc.

Erwin C Witte

Paul V Pagel

William D Myers

A process for the electrodeposition of a multilayered coating on an article formed of titanium or titanium alloy comprises the steps of: (i) cleaning the article by conventional means, such as by descaling, dry blasing, soaking, and rinsing, so as to remove oxides and other surface contaminants therefrom and expose the article's titanium substrate; (ii) immmersing the clean article in an agitated acid bath at room temperature to activate the surface thereof; (iii) immersing the thus activated article in an agitated aqueous nickel bath preferably comprising nickel chloride at room temperature and cathodically applying a relatively thin non-porous nickel base coat directly on the exposed titanium substrate to improve subsequent zinc adhesion thereto; and (iv) immersing the nickel-plated article in an agitated aqueous zinc bath preferably comprising zinc oxide, sodium cyanide, sodium hydroxide and sodium carbonate and electrodepositing a zinc layer of desired thickness over the nickel base coat. The thus coated titanium article is thereafter preferably baked to provide hydrogen relief therefor. Where a bright surface finish is desired, the article is thereafter dipped for a short period in a brightening solution preferably comprising sodium cyanide. Alternatively, an extra measure of corrosion resistance is obtained, where desired, by supplementary chromate treatment of the article subsequent to the hydrogen relief-baking thereof.

Electrodeposited multilayer coating for titanium

A fastener comprising a nut with V-threads modified to have a wedge ramp between adjacent flanks at the root thereof and characterized by the uniform pitch of the nut thread being a predetermined amount greater than the uniform pitch of the bolt thread which, in combination with the wedge ramp, results in optimum stress distribution within the bolt as well as a prevailing torque and anti-vibration relationship between the nut and bolt.

Fastener

A prevailing torque type self-locking nut has an internal aperture provided with wedge ramp type threads, the aperture being tapered in cross section adjacent the top of the nut.

Self-locking nut

A torque limiting nut assembly having a threaded nut member and a spring wrench member which are interconnected by a ratchet like construction in which the magnitude of final assembly torque is predetermined by the torque required to initiate ratcheting of the ratchet like construction and with the ratchet like construction defining a non ratcheting, positive engagement construction for disassembly torque whereby the threaded nut member can be removed.

Torque limiting nut assembly

The threads at the entrance end of a nut are interrupted by a plurality of circumferentially spaced axially extending flutes to form relatively flexible load distributing threads. The flutes extend axially across a limited number of threads and extend radially into the threads a distance short of the root of the thread. After engagement with a complimentary bolt, and upon the occurrence of a load on the connection, the interrupted threads flex axially of the nut to cushion shock on the bolt threads and shift the zone of maximum stress transfer axially inwardly of the nut, thereby materially extending fatigue life of the connection.

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Placentia, CA, United States of America

Erwin C Witte