Abstract: An adjustable support for a sensor has a first support defining a first end and a second end. A first clamp is fixedly coupled to the first support between the first and second and thereof. The first clamp has an adjustable coupling for selective fixation to a support platform. A second support is adjustably coupled to the first support in a way that supports the second support, facilitates selective movement of the second support relative to the first support in one dimension, and facilitates fixation of the second support relative to the first support. A second clamp is adjustably coupled to the second support so that a sensor fixedly coupled to the second clamp can be moved relative to the second support and fixed thereto by the second clamp.

Abstract: A method and system are provided for finishing a concrete floor that exce approximately 50 feet in width. A riding trowel of the type that forms a windrow of loosened concrete material in its wake is positioned on the concrete floor. The riding trowel has a straight edge coupled thereto by a support assembly that positions the straight edge to cross the windrow at a substantially perpendicular angle thereto within line-of-sight of an operator. A power assembly is coupled between the straight edge and the riding trowel for independently controlling vertical and pivoting movement of the straight edge. The riding trowel is driven on the concrete floor and the straight edge is moved along the concrete floor simultaneously with the riding trowel.