Flexible magnet yoke for a crane

Claim 1

A crane comprising a mast, an elongated support, a bracket secured to the lower end of said mast, said bracket having generally parallel vertical sides forming an opening for receiving said elongated support, a first generally horizontal pivot pin supported by said parallel vertical sides on which said support is mounted for pivotal movement, a pair of suspension bars, spaced vertical walls in said support for receiving each of said suspension bars, a second generally horizontal pivot pin supporting each of said suspension bars for pivotal movement and supported by said spaced vertical walls, a generally vertical sleeve at each end of each suspension bar, a hanger bolt extending through each sleeve with a space between the hanger bolt and the sleeve, a plate surrounding each hanger bolt above the top of said suspension bar, springs bearing against the bottom of said plate biasing said hanger bolt upwardly, a magnet associated with each suspension bar, a clevis attached to each end of the associated magnet, and a pivot pin connecting the bottom end of each hanger bolt to the associated magnet, the axis of said pivot pin being normal to the vertical plane through the axis of the suspension bar.