Thread lock
AssigneeThe Oakland Corporation
InventorRichard B. Wallace
Life of this patent
Estimating the term…
Abstract
A friction material in the form of a substantial percentage of cured or polymerized powdered nylon and/or teflon resin is mixed in a binder which is mainly fluid epoxy resin and an activator therefor, and applied to the threaded portion of a threaded member. The epoxy resin is reacted by the activator at room temperature or at least at a temperature well below the fusion point of the nylon or teflon particles to bond the powder particles together and to establish a bond to the thread surfaces to form a substantially uniform mixture of the powder particles and binder and to form a substantially solid, non-tacky, resilient friction element strongly bonded to the thread surfaces and frictionally interfering with the threads of a mating threaded member.
Claims18
A metal threaded member having in the thread grooves thereof a solid deposit of friction material effective to provide a frictional resistance to turning of the threaded member in thread-engaging relation to a companion threaded member, said deposit consisting essentially of a body of a uniform mixture throughout of a major proportion of uniformly dispersed discrete particles of pre-cured thermoplastic resin adhered together to form a substantially solid continuum by a bonding resin cured in situ, said bonding resin forming a bond directly between individual particles, substantially filling the spaces between the particles, and also forming an essentially permanent bond to the surfaces of the threads throughout the deposit area.
The method of making friction threaded members which comprises preparing an essentially fluid uniform mixture of a fluid bonding uncured resin, an activator to promote polymerization thereof, and a major proportion by volume of discrete solid particles of pre-cured theremoplastic resin particles, applying without confinement or pressure and at substantially room temperature a quantity of the mixture to a limited area of the threaded portion of the member so as to form a fluid deposit of substantial depth in the thread grooves throughout the area while preventing extension of the material radially beyond the crests of the threads, and curing the bonding resin in situ at temperatures substantially below the melting point of the pre-cured particles to provide a solid deposit in the form of a substantially solid continuum in which the particles are distributed substantially uniformly throughout the deposit, the bonding resin forms a permanent bond directly between individual particles, substantially fills the spaces between particles, and also forms an essentially permanent bond to the thread surfaces throughout the deposit area.
Dependencies are inferred from the claim text.