Abstract: A screed bar for a vibratory concrete screed is formed from a long hollow extrusion having generally flat enclosing walls and defining in cross section two triangular sections that share a common interior wall.

Abstract: A vibratory concrete screed includes a vibration isolation system that minimizes the transmission of vibrations to the operator under normal operating conditions, but becomes more rigid during screed control forces applied to the blade through the isolation system when the operator applies greater forces to the operator handle. The system includes low durometer elastomer vibration isolators isolating the operator handle from the vibration exciter and screed blade in a manner that limits vertical compressive movement of the isolators, yet permits substantially greater horizontal shear movement to effectively isolate the operator from vibration. The isolator mounting arrangement also includes retainers that engage the isolator to limit the amplitude of horizontal shear movement when the operator applies a greater control force to the operator handle.

Abstract: A vibratory concrete screed includes a vibration isolation system that minimizes the transmission of vibrations to the operator under normal operating conditions, but becomes more rigid during screed control forces applied to the blade through the isolation system when the operator applies greater forces to the operator handle. The system includes low durometer elastomer vibration isolators isolating the operator handle from the vibration exciter and screed blade in a manner that limits vertical compressive movement of the isolators, yet permits substantially greater horizontal shear movement to effectively isolate the operator from vibration. The isolator mounting arrangement also includes retainers that engage the isolator to limit the amplitude of horizontal shear movement when the operator applies a greater control force to the operator handle.

Abstract: A soil compacting percussion rammer includes an operator handle assembly that is isolated from the main machine frame by a shock absorbing mount oriented to absorb the horizontal components of operating movement of the rammer. In a preferred embodiment, the shock absorbing mount comprises a pair of torsionally resilient shock absorbers interconnecting the frame and the operator handle and oriented to position the shock absorbers on a common torsional axis that is vertically offset from and generally parallel to the horizontal operator handle.

Abstract: A soil compacting percussion rammer includes an operator handle assembly that is isolated from the main machine frame by a shock absorbing mount oriented to absorb the horizontal components of operating movement of the rammer. In a preferred embodiment, the shock absorbing mount comprises a pair of torsionally resilient shock absorbers interconnecting the frame and the operator handle and oriented to position the shock absorbers on a common torsional axis that is vertically offset from and generally parallel to the horizontal operator handle.