Implements or apparatus for applying pushing or pulling force – Device or member for contacting and guiding moving cable – Including rotatable – cable contacting – pulley wheel element
Reexamination Certificate
2000-04-05
2001-08-21
Marcelo, Emmanuel M. (Department: 3653)
Implements or apparatus for applying pushing or pulling force
Device or member for contacting and guiding moving cable
Including rotatable, cable contacting, pulley wheel element
C254S389000, C294S067200, C294S067310
Reexamination Certificate
active
06276666
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an apparatus and method for moving a load and, in one aspect, an apparatus and method for raising a load onto an elevated surface and lowering a load from an elevated surface.
BACKGROUND OF THE INVENTION
In many situations, items must be lifted onto an elevated surface or lowered from an elevated surface. Often, equipment must be lifted onto or lowered from rooftops or elevated platforms. Unless a hoist is provided on the elevated surface, the equipment is typically carried up a ladder by hand or, if the equipment is sufficiently heavy, is lifted onto the elevated surface by a crane.
Hand carrying equipment via a ladder can be dangerous, especially if the equipment is cumbersome or heavy. The use of a crane to move equipment onto or from an elevated surface is not typically dangerous but can be quite expensive. Further, it is difficult in some circumstances to position a crane within close confines so that it can reach the elevated surface.
Thus, a need exists for a lifting device which can be inexpensively and readily positioned to lift items onto and lower items from elevated surfaces.
BRIEF SUMMARY OF THE INVENTION
The present invention is a new and advantageous apparatus and method for raising a load onto an elevated surface and for lowering a load from an elevated surface.
The present invention includes a boom having a lower end and an upper end and a base having a front end and a rear end. The front end of the base is pivotably connected to the lower end of the boom along a pivot axis, wherein a lower surface of the base rests on a support surface while a load is being moved. A first restricting mechanism restricts relative movement between the boom and the base about the pivot axis in a first direction and a second restricting mechanism restricts the relative movement between the boom and the base about the pivot axis in a second direction. A pulley mechanism is disposed proximal to the upper end of the boom. A rope having a load end is provided, wherein the load is attachable to the load end of the rope. The rope is threaded through the pulley mechanism. An attached load is lifted when the rope travels in a lifting direction through the pulley mechanism and the attached load is lowered when the rope moves in a lowering direction, which is opposite of the lifting direction, through the pulley mechanism.
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Lockheed Martin Corporation
Marcelo Emmanuel M.
Sadacca Stephen S.
Sidley Austin Brown & Wood
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