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AssigneeUSM Corporation
InventorsMaynard Arnold Axvig, Jose Asuncion Franco
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Apparatus and process for applying locking patches of resilient, heat softenable resin to internally threaded articles having openings at both ends, in which the threaded portions of the articles, heated to a temperature above the softening point of the resin to be applied, are moved on a conveyor as a uniform succession at a uniform continuous speed in a path for application of particles of the resin with the openings at the ends of the articles substantially uncovered, a stream of resin particles entrained in a gaseous jet is directed by a resin particle stream guide through the openings in successive moving articles against threaded areas of the articles where the particles adhere and melt to form locking patches, flow of the gaseous jet is controlled relative to movement of a repeating feature of the articles on the conveyor to supply the stream of resin particles when the stream guide is in, and to interrupt the stream of particles when it is out of particle applying relation to the articles, and a suction device is applied adjacent the upper openings in the articles during powder application to improve flow of the resin particles and to draw off resin particles which have passed through the articles and preferably also to keep the resin particle supply system clear. In a preferred system, the guide is moved into and out of stream directing relation to successive articles on the conveyor and is moved along with successive articles when in stream directing relation to such articles for a time to deposit a thickness of resin to give desired locking ability, the in and out movement of the stream guide being controlled relative to movement of a repeating feature of the articles, and the conveyor is a pair of spaced belts on which hex headed fasteners are arranged in flat to flat continuous succession with their axes in generally up and down position and with the lower openings of the fasteners left uncovered by the space between the belts.
In an apparatus for applying locking patches of resilient heat softenable resin to internally threaded articles having openings at both ends comprising:
An applicator for applying a stream of particles entrained in a gaseous jet at intervals as required, said applicator comprising a substantially horizontal conduit terminating in a discharge orifice, a gas supply connected to deliver a stream of gas through said conduit and out through said orifice, a continuous resin particle supply, an opening in said conduit for passage of resin particles from said supply into said conduit at a location to be entrained and carried through said conduit and out through said orifice by said gas stream, means to shut off said gas supply to interrupt said stream of resin particles and to restore said gas supply to resume discharge of said stream of resin particles, a port into said conduit intermediate said conduit opening and said orifice and a suction device associated with said port to continuously pull air in through said conduit opening and said orifice and to draw off through said port resin particles left in or deposited in said conduit when said gas supply is shut off.
In a process for applying locking patches of resilient heat softenable resin to internally threaded articles having openings at both ends comprising the steps of conveying a uniform succession of said threaded articles at a uniform speed in a path for treatment with the openings at the ends of said articles substantially uncovered,
Dependencies are inferred from the claim text.