Abstract: A mechanism is disclosed for steering in the reverse direction a towed or pulled wheeled vehicle, such as a trailer with one or more axles, each axle having one or more pairs of steerable wheels. A steering rod is connected to at least one of the steerable trailer wheels and extends generally along the trailer axle, terminating at a pivotal connection mechanically movable in relation to a pivotal connection between a fixed support rigid with the trailer axle and a plate rotatable with respect to the trailer axle and angularly positioned by operative association with the vehicle. Movement of the pivotal connection between the steering rod and plate, provided for by suitable mechanical means, imparts a lateral displacement to the steering rod, causing the trailer wheel and by mechanical connection, all trailer wheels, to turn and the trailer to proceed in the same path of movement as the towing vehicle when the vehicle and trailer are moving in a reverse direction.

Abstract: A device is disclosed for excavating a trench in frozen or unfrozen soil and introducing cable within the trench thereby excavated. An integral vibrating or reciprocally moving blade breaks frozen soil and cuts roots, and trench depth, as well as blade angle of attack is controllable by means of an eccentric mounting structure for the blade. Angulated projections on each side of the blade lift soil from the trench formed, and a vertically adjustable connection between the blade and a following cable laying guide maintains proper elevational relationship therebetween.

Abstract: A retainer assembly for securing insulation material or similar material in mounted position against or alongside of a wall surface or the like. The retainer assembly includes a longitudinally extending extension or stud having a retaining washer longitudinally adjustably mounted thereon in a secure and positive manner. In one embodiment, the extension is adjustably supported by use of an extension holder which adjustably connects to the extension and is welded or otherwise bonded to a furnace wall. In another embodiment, the extension is adjustably mounted in a bore whereby the end of the extension having the retaining washer thereon may be oriented to secure the insulation material or liner in predetermined relation to the supporting surface or wall such as refractory brick or the like.