Patent ID: 8631902

Claim:
Apparatus for elevating and positioning a work platform, said apparatus comprising: a) a mobile support structure; b) an extensible boom connected to said support structure for pivotal movement about a substantially horizontal axis extending transversely to said support structure, said boom having a platform support end; c) an elongated platform support beam having a longitudinal axis which remains in a substantially horizontal orientation connected to said platform support end of said boom and a piston and cylinder unit connected to said platform support beam and connected to said boom, said piston and cylinder unit maintaining said platform support beam in said substantially horizontally extending orientation during said pivotal movement and during an elevation and lowering of said boom; d) a carriage mounted for sliding movement on said support beam to horizontally spaced positions above said boom; e) a motor for moving said carriage to said horizontally spaced positions; and f) a platform having an upper surface, said platform mounted on said carriage for rotation of said platform about a substantially vertical axis which extends through said carriage and said boom and is located at a geometric center of said upper surface of said platform.