Patent ID: 6760974
Filing Date: 2004-07-13
Classification: E04F,G01C

Abstract:
A height indicating instrument useful in the preparation of a flat and level cementitious floor underlayment over an uneven sub floor, comprising a first rod assembly having a foot engagable with the surface of a sub floor, and a second rod assembly operatively attached to and adjustable axially with respect to the first assembly, the second rod assembly having a height indicator adjacent said foot to indicate the desired underlayment height and carrying a laser beam detector adjustable vertically with respect to said height indicator, the instrument including a laser beam generator for generating a horizontal laser beam detectable by said laser beam detector, whereupon vertical movement of said second rod assembly with respect to the first rod assembly to horizontally align said detector with said generator simultaneously moves said height indicator to adjust the elevation of the latter with respect to the sub floor.