Patent ID: 11932520
Assignee: LIFTRA IP APS
Field: Handling (Mechanical engineering)
Classification: CPC B  F  Y | IPC B  F

Claim 5:
6. A self-hoisting crane according to claim 1, wherein the hoist block is formed as an elongated element being provided at either end with extending pivot pins arranged coaxially with a longitudinal axis of the hoist block, wherein the hoist block has two outer rollers arranged at the respective ends of the hoist block and two inner rollers arranged between the outer rollers, wherein the outer and inner rollers are arranged with their axes at a distance from the longitudinal axis of the hoist block and at right angles to the longitudinal axis, wherein the axes of the outer rollers are fixed in relation to the elongated element, and wherein the axes of the inner rollers are pivotal in relation to the elongated element about an axis being parallel with or co-axial with the longitudinal axis of the hoist block.