The Austin Company

Kalman Floor Company

Barry A Rogers

Donald R Shelangoskie

Alex Sestak

Jeffrey J Morris

Eric K Jacobsen

Patrick A Masterson

Jack H Brown

Lawrence J Valentine

Ricky A Pierce

James T Wright

Dario A Gasparini

Arthur A Huckelbridge, Jr

Stephen Marine

Arthur A Huckelbridge

James Thomson Wright

Deviations in flatness on a horizontal surface are measured by running over the surface, at a constant driven speed, an instrument sensitive to slope and which generates a continuous voltage signal corresponding to a continuous slope measurement. The continuous voltage signal is filtered to remove extraneous high frequency voltage signals thereby to produce raw continuous analog slope data which is digitized and calibrated to provide calibrated digital slope data from which other flatness data is computed. Procedures are described for calibrating the instrument and for eliminating or compensating for distortions in the measurements.

Method and apparatus for measuring deviations from flatness

Improved connections of preformed concrete construction elements wherein one or more metal pins, of any preferred cross-sectional shape, are cast in place, or grouted, extending into each of two elements to be connected, with an elastic grommet disposed between a portion of each pin, in an area on each pin nearest the joint, and the surrounding concrete or grout, whereby the load transfer capacity of the connection is increased about threefold.

Joint of preformed concrete elements

Growing community of inventors

South Euclid, OH, United States of America

Barry A Rogers