Jack D Mainville

50245503, Jun 18, 1991

Sep 26, 1989

7/412913

Jack Mainville - Meriden CT

E01C 1122
E04C 242

404 4

A trench grate includes angular frame members having a number of spaced apart rectangular openings along a downwardly extending leg to receive L-shaped tabbed ends of cross members located transversely between the two angular frame members. The portion of the L-shaped tabbed member extending through the opening in the downwardly projecting leg is welded to an outer face of the downwardly extending leg to form an ingegral unit. The trench grate is a single piece unit and rests on the lip surface of a subterranean drainage structure.

46827650, Jul 28, 1987

Dec 19, 1985

6/811106

Jack Mainville - Meriden CT

B25B 120

269 41

Welding jig apparatus for holding bar stock workpieces in an intersecting and aligned relationship to form a metal grating structure includes a number of elongated radial cams located in a spaced apart relationship to each other and in two parallel rows on a work surface. Workpieces are located between adjacent cam faces of cams opposite one another in the two rows when the cams are in a nonclamping position. The workpieces are clamped into the desired position by arcuate cam surfaces when the cams are rotated to clamping position. The work surface is tiltable to one of a number of work positions to facilitate the welding of intersecting workpieces into the grating structure.

47091339, Nov 24, 1987

Apr 2, 1986

6/847441

Jack Mainville - Meriden CT

B23K 912

2191251

Welding apparatus for simultaneously applying a number of parallel welding beads to workpieces for welding the workpieces along their intersecting edges into an assembly. A carriage is arranged for rectilinear motion along a path and holds a number of welding arms for movement with the carriage. The welding arms comprise welding stations and are arranged in a spaced apart relationship to one another and in proximity to workpieces held at the welding station so that the arms follow along the workpiece edges when the carriage moves along the path. A controller energizes and de-energizes a bi-directional motor and electric arc welding apparatus in response to signals provided by position sensing switches that sense the position of the carriage along the path and the controller causes the carriage to be automatically returned to its starting position after a welded assembly is removed from the welding station.