Post mounting anchor base

Abstract

A ground anchor provides a mounting base for a sign post accommodating rotational, tilting, and height adjustments of the post and providing for release of the post at ground level in the event of impact by a vehicle so that no upstanding obstacle capable of causing injury will remain after impact. An angle iron leg with upstanding fins or spade members at the leading and trailing ends thereof is driven or otherwise buried into the ground. A tubular member seated in the channel of the angle iron is bolted to the legs or sides of the angle iron at a selected level to present a top edge or rim supporting an anchor plate with a central raised fragmental spherical dome. The anchor plate is fixedly secured to the tube by bolts threaded into upstanding lugs secured to the tube. The post has a fixed base plate on the bottom thereof resting on the spherical projection and shear bolts extending through slots in the anchor plate and holes in the peripheral marginal portion of the base plate clamp the base plate on the spherical projection of the anchor plate. These bolts can be adjusted to tilt the post relative to the anchor and the bolts can slide in the slots to accommodate rotational indexing of the post. Ground anchored cables are tensioned to the tubular member to further fix the leg in the ground.