Crane
OwnerJeffrey Lee Crowderinventor
Life of this patent
Estimating the term…
Abstract
A crane to be fitted in a window opening or the like, between two opposing surfaces, has a strut (14) which is first braced between the surfaces (20a, 20b), and a boom (13) which extends away from the strut. A winch (5) on the crane winds up a lifting cafe (12) which runs over a pulley (3) at the outer end of the boom (13). The top and bottom ends of the strut have end plates (15, 7) which are designed to hold the crane rigidly between the two surfaces, but without damaging any surface finish on either surface. The boom (13) can be swung about the axis of the strut (14) to bring the load carried by the crane in towards the position of the operator.
Claims7
A crane for installing a window in a window opening in a building, comprising:
- a strut;
- a head plate at one end of the strut;
- a foot plate at the other end of the strut;
- the strut being extendable to press the head and toe plates against opposing top and bottom surfaces of the opening;
- a boom, pivoted at one end to the strut;
- a winch, mounted on the strut, around which a hoisting cable can be wound, the hoisting cable extending from the winch, over a first pulley at an upper region of the strut, over a second pulley mounted on the boom between the strut and the distal end of the boom, over a third pulley at the 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 so that the window can be located in its final position without removing the crane from the window opening.
Dependencies are inferred from the claim text.