Patent ID: 7946560

Claim:
A hook block for a crane, comprising: a) a first sheave housing containing a plurality of sheaves and having extended portions each with a hole therethrough, the first sheave housing including a housing frame at a bottom thereof, the housing frame including a locking surface; b) a first cross beam having multiple brackets each with a hole therethrough, at least one of the brackets having a plurality of surfaces corresponding to a plurality of angles of relative position between the first sheave housing and the first cross beam, wherein the plurality of surfaces correspond to the locking surface and form a gap therebetween at each of the plurality of angles; c) a first shaft rotatably captured within the holes of the extended portions of the housing and of the multiple brackets of the first cross beam; and d) a locking bar sized to be placed in the gap between the locking surface and any of the plurality of surfaces, wherein when in place, the locking bar substantially immobilizes movement of the first sheave housing relative to the first cross beam.