United States Golf Association

Henry Thumm-Borst

Alexander J Smits

Frank W Thomas

Burton B Lieberman

Robert A Tygar

Stanley E Chrapowicki

Leonard F Anfinsen

Mark Zagarola

Steven J Quintavalla

Bernard C Soriano

The ball sizing device has an angularly disposed support which defines a square-shaped space for receiving a dimpled golf ball. The two lowermost walls defining the space receive the ball in point-to-point contact. Each of the two opposite walls has a gauge mounted thereon with a spring loaded pin for engaging the ball in point-to-point contact. Each gauge serves to measure a deviation of the diameter of a ball from a standard diameter. The readings from the gauges are processed in a central processing unit in order to obtain a statistical average of the diameter of the ball. A standardizing cylinder is separately mounted on the sizing device in order to calibrate the two gauges to a zero reading and to provide a standard diameter value to the central processing unit.

Automatic ball sizing device

The test range is provided with a calibration system for calibrating the exact position of a light curtain formed by a ballistic screen. The calibration system uses a model ball which can be moved through a light screen at high speed in order to simulate the actual passage of a driven golf ball through the light screen. Positioning of the model golf ball at a point at which the golf ball just contacts the light screen serves to determine the exact location of the light screen. A laser ranging device is used to locate the calibration system relative to a launch point. Thus, the precise distance of the curtain of light from the launch point can be readily determined. The calibration system may also be used to determine if a ballistic screen is mounted in a true vertical plane.

Test range for determining the aerodynamic characteristics of a ball in

Growing community of inventors

Norristown, NJ, United States of America

Henry Thumm-Borst