Patent ID: 6704115
Filing Date: 2004-03-09
Classification: G01B,G01C

Abstract:
A target assembly for a laser alignment system, the target assembly comprising three light-sensitive target cells fixedly mounted to a support plate in proximity to one another to define corners of a triangle, the light-sensitive target cells all facing in a common direction, each said target cell having first and second perpendicular axes, the first axes of said target cells being mutually parallel to one another, the second axes of the target cells being coplanar and substantially parallel to the support plate, said target assembly having a ball mount for mounting the target assembly to a sheave such that the support plate and the second axes of the respective light-sensitive target cells are aligned substantially perpendicular to a rotational axis of the sheave, and wherein said ball mount includes a plurality of balls arranged in an L-shaped pattern to engage a plurality of grooves of said sheave.