Abstract: A hoisting tackle block assembly is described for receiving and accommodating a rope loop without having to thread a free end of the rope through the block housing and over a sheave. The assembly includes a shaft with a sleeve mounted for rotation about the shaft axis. The assembly includes two housing members mounted on shaft ends that extend alongside the sleeve and over the sheave terminating in upper connecting ends. The housing members are angularly movable with respect to each other to enable the housing member to be angularly displaced to enable a rope loop to be placed over the sheave. The housing members are then aligned with each other to enclose the rope loop for operation.