| Show A NEW TROLLEY EAR EA R WRITTEN FOR THE MINING REVIEW the general electric company has recently placed on oil the market a new mechanical clamping ear known as form H especially ally designed for use un oil overhead construction st in and around mining and indus the clamping nut effectually preventing any possibility of the ear becoming loosened in service the new ear is made up suitable for round grooved and figure 8 wire and has m nf fig fie 1 I trolley ear trial properties the ear consists entirely of forgings forg ings and of steel thus eliminating entirely such imperfections and variations as are common to iron castings this feature also permits of using small light sections of great mechanical strength resulting in an ear giving a maximum clearance from passing trolley wheels and a minimum height from the center of the wire to the top of the clamping nut the jaws are duplicate drop forgings forg ings each lip fitting into the recesses of the trolley wire with absolute accuracy insuring a grip which will have the greatest possible holding power the jaws are hinged by a steel pin located close to the wire and are of a length sufficient to utilize the maximum clamping effect produced by the clamping nut the machine steel stud jacket engages shoulders on the clamps and fits into the hexagonal interior of the clamping nut thus by rotating the nut the stud jacket is drawn on to the suspension stud while the nut exerts an outward pressure on the upper outer edge of the jaws which by reason of the hinge presses against the trolley wire the punched washer is formed around the top of the jaws to prevent its turning while the clamping nut is being tightened it is also provided with two small lugs which may be bent up against the side of either japanned or standard finish the form ii ear when used in connect 1 ir fig 2 cross section of trolley ear tion with form H 5 suspension of the mining and ceiling type renders possible an increase in head room of 1 LO io 2 if inches iches |
