Patent ID: 7905528
Filing Date: 2011-03-15
Classification: B66C

Abstract:
1. A spreader frame adapted for hoisting a container, the container having at least one lifting block, the spreader frame comprising: a rigid frame structure; a twist lock received by the rigid frame structure, the twist lock being rotated relative to the rigid frame structure between a locked position to engage the lifting block and an unlocked position to disengage from the lifting block; a safety feature which cooperates with at least one of the rigid frame structure and the twist lock to retain the twist lock in the locked position from being rotated relative to the rigid frame structure absent personnel changing a position of the safety feature; a security cover received by the rigid frame structure, at least one of the rigid frame structure, twist lock and security cover including the safety feature; and the safety feature including one of the security cover and the twist lock having a projection, the safety feature including the other of the security cover and the twist lock having a retaining recess which receives the projection to prevent the twist lock from being rotated relative to the rigid frame structure.