The hinge 78 has a pair of transverse flanges 88 which have apertures 90 which are sized to receive attachment pins, rivets, screws, bolts or other connecting means that permit pivoting movement (not shown) for attaching an upper guard 92 (see FIG. 12) that has an aperture 94 for receiving a connector such as a rivet, bolt or the like for attaching the hinge 78 to the upper guard 92.