Jose Gustavo Franco

US Patent:

40608689, Dec 6, 1977

Filed:

Jan 17, 1977

Appl. No.:

5/760137

Inventors:

Maynard Arnold Axvig - Westminster CA
Jose Asuncion Franco - Los Angeles CA

Assignee:

USM Corporation - Boston MA

International Classification:

B23G 900
B05B 100
B05B 714

US Classification:

10 72R

Abstract:

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.