Abstract: A rotary trowel device includes a substantially horizontal shroud having an electric motor assembly mounted on the upper surface thereof, and having a rotary trowel blade assembly located below the shroud. The trowel blade assembly includes a hub connected to an output shaft of the electric motor assembly. The trowel blades are shiftable between tilted and non-tilted position by components located within the hub.

Abstract: An under ground pipe installation apparatus includes a pair of spaced apart, longitudinally directed I-beams and a carriage slidable longitudinally along upper horizontal surfaces of the I-beams. A pair of hydraulic cylinders, one mounted with respect to each beam, reciprocate longitudinally extended rods, the free ends of which are secured to the carriage. A pair of opposed jaw assemblies are mounted pivotally relative to the carriage about respective transverse pivot axes, to enable their movement into and out of a closure position about a longitudinally extended pipe section. A pair of longitudinally extended coil springs, each attached at its rearward end to an associated one of the hydraulic cylinders, have free ends positioned to engage jaw actuator pins parallel to and laterally outward of the pivot axes, once the rearward traveling carriage reaches a predetermined location along the beams.