Patent ID: 6851198
Filing Date: 2005-02-08
Classification: A63B

Abstract:
1. An apparatus for projecting a laser beam onto a target from which to measure the position of a football on a football field, the apparatus comprising: a laser emitting the laser beam, the laser beam having a wavelength in the range of from about 450 nm to about 550 nm; means for shaping the beam; a measuring device comprising a first down marker pole alienable on a sideline of the football field and a scrimmage pole connected by a chain wherein the laser is attached to the first down marker pole and is alienable at a 90° angle with the sideline; and a target positionable on a far side of the football; wherein the laser beam emitted by the laser is projected over the football field toward the target such that a laser first down mark is orented near the football as a result of the laser beam being intercepted by the target.