Crane

A crane for use in raising loads, the crane being adapted to be secured in an opening in a building wall, the crane comprising an adjustable length strut having a head plate at one end and a foot plate at the other end and a boom mounted on the strut, the strut being extendable to press the head and foot plates against opposing surfaces of the opening, wherein the boom is pivoted at one end to a lower region of the strut and wherein the crane includes a winch on which a hoisting cable can be wound, the hoisting cable extending from the winch, around a pulley at an upper region of the strut, over a pulley at a distal end of the boom and to a load engagement point, such that when a load is fully hoisted to the distal end of the boom, further winding of the winch draws the boom towards the strut.

A crane for use in raising loads, the crane being adapted to be secured in an opening in a building wall, the crane comprising an adjustable length strut having a head plate at one end and a foot plate at the other end such that the strut can be set in place in a window opening by extending the strut to engage the head and foot plates with opposing surfaces of a window opening, a boom mounted on the strut and a winch, wherein the boom has a pulley at its end remote from the strut, and a hoisting cable runs from the winch, over the pulley and to means which is to be attached to a window to be lifted into the opening, so that the window can be lifted by operating the winch from within the building.

A crane comprising a strut, a boom mounted on the strut for pivotal movement about an axis perpendicular to the length of the strut, a winch, a hoisting cable and means for securing the strut to a fixed structure.

A method of installing a window in a window opening in a building using a crane, the crane comprising an extendable elongate strut, a boom mounted on the strut, a head plate at one end of the strut and a foot plate at the other end of the strut, the method comprising the steps of positioning the crane in the window opening so that the position in which the window is to be installed is not obstructed by either the head plate or the foot plate, extending the strut to bring the head plate and foot plate into contact with opposing surfaces of the window opening internally of the opening, and using a cable running over a pulley at the end of the boom to raise a window up to the height of the window opening so that the window can be fixed in its final position without removing the crane from the window opening.