Ethan Adam Frantz

US Patent:

20050242052, Nov 3, 2005

Filed:

Apr 30, 2004

Appl. No.:

10/837445

Inventors:

Michael O'Connor - Redwood City CA, US
David Lawrence - Mountain View CA, US
Avi Gross - Palo Alto CA, US
Ethan Frantz - Menlo Park CA, US
Robert Melhorn - Mountain View CA, US

International Classification:

B66C019/00

US Classification:

212344000

Abstract:

A gantry crane system includes a frame structure having a plurality of vertical support legs and one or more members interconnecting predetermined pairs of the vertical support legs; and a positioning system including positioning sensors mounted to the frame structure and configured to receive positioning signals from positioning transmitters and a position processing unit configured to use the positioning signals to determine a deflection from vertical of at least one of the vertical support legs. In certain embodiments, the gantry crane system further includes a grappler assembly mounted to the frame structure. The position processing unit is configured to use the positioning signals to determine a location of the grappler assembly.