Traversing hoists – Having means facilitating assembly or disassembly – Of traversing hoist from support
Reexamination Certificate
2001-01-04
2002-11-12
Bratlie, Steven A. (Department: 3652)
Traversing hoists
Having means facilitating assembly or disassembly
Of traversing hoist from support
C212S324000
Reexamination Certificate
active
06478172
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to the portable lifting devices intended to lift the massive objects and mostly for the massive object lifting and loading and/or unloading through the window openings.
BACKGROUND OF TIE INVENTION
The devices for lifting of the objects and transporting them for short distances have become specialized.
Some of such devices are characterized by having a central bay defined by two spaced sides and an arch-like structure connecting the sides that bridges over the bay. A straddle carrier is adapted to be driven over a load, such as a container or van, to receive the load within the bay. By raising the load is elevated for transport, or for stacking one container upon another by utilizing the frame as an elevator. In some straddle carriers the bay is sufficiently large so that by turning the load can be shifted in its orientation, and it is consequently desirable to suspend the load in such fashion that they can turn or reorient the load without moving the entire straddle carrier.
It is unsatisfactory to maneuver the entire straddle carrier in order to align the spreader frame with the load, and the art has addressed itself to this problem by providing some controlled degree of longitudinal and lateral movement of the spreader frame with respect to the straddle carrier chassis. For example, some spreader frames are supported by four hoist cables connected to its four corners, and one end of the frame can be shifted either sidewardly, or turned so as to skew the entire frame.
The U.S. Pat. No. 4,266,904 discloses a lifting device with the spreader frame. The frame is swivelly connected to a vertically adjustable reaction member that is fixed against rotation but free to pivot sidewardly, an extendible operating element connected between the frame and the reaction member for swivelling the frame with respect to the reaction member about a first axis of movement, a second extendible operating element connected between the frame and the reaction member for swivelling the frame with respect to the reaction member about a second axis of movement, a third extendible operating member for pivoting the reaction member, and supporting elements spaced along the frame adapted to raise and lower the frame. Alignment of the frame can then be made with a load that is oriented initially at a substantial variance in position from the frame in either the horizontal or vertical direction. Further, once the load is raised it can be reoriented in its position by swivelling the frame, or translating the frame in any of several directions of movement without any necessity of maneuvering the straddle carrier from which it is suspended. In this manner, a load can, for example, be lifted from a freight car that is positioned in one direction, then rotated through an arc and translated to another position for depositing on a semi-trailer that is positioned in a different direction than the freight car. With this capability the associated straddle carrier, or other structure that suspends the spreader frame, need not be moved in trans-shipping a load from one form of conveyance to another. Furthermore, the spreader frame makes practical a form of straddle carrier spanning a large open area between its ground engaging supports, or which cantilevers a frame outwardly from its supports to also service a working area outside the perimeter of the supports. It then becomes possible to use a straddle carrier as a form of gantry, as well as being a vehicle for transporting a load from one site to another. The elongated spreader frame is suspended beneath a trolley that can move back and forth along rails. A vertically adjustable reaction member in the form of a column extends from the trolley downward to a swivel connection with the spreader frame. The column is mounted in the trolley in a restricted manner that restrains it from rotation, but it is free to pivot in the longitudinal direction of the spreader frame. A pair of hydraulic operating cylinders are connected between the column and the spreader frame for swivelling the spreader frame around two axes of movement. The spreader frame is also supported from the trolley near its ends by lifting means that can raise and lower the frame ends with respect to the trolley. The entire frame can then be raised or lowered, or by independent movement of the lifting means the frame can be tilted about a third axis. Thus, the spreader frame can be rotated about any of three principal axes to spatially orient it through a substantial range of positions. Shifting movements which translate the spreader frame are also made possible. One shifting movement is accomplished by connecting a hydraulic cylinder between the column and the trolley to tilt the column and thereby shift the swivel connection at the lower end of the column in the longitudinal direction of the frame.
nThe mentioned prior art is complex and does not provide the lifting, loading and/or unloading the objects through the window opening.
Another U.S. Pat. No. 6,065,621 discloses the lifting mechanism, having a telescopic boom, four telescopic support legs with pivotable wheels thereon, and a low center of gravity frame of a two part construction pivotally connected together and having a tilt indicator warning thereon.
Specifically the lifting mechanism includes the first frame, a second frame, a pair of rear retractable and extendible leg extensions (or wheel frames), a rear wheels and on each rear wheel frame, a pair of front retractable and extendible outriggers (wheel frames), a front wheels on each front wheel frame, a selectively retractable and extendible boom, a boom angle actuator, an actuator drive device in communication with the boom angle actuator such as by electrical or fluid lines, a power supply in communication with the selected parts of the lift mechanism that need power, a winch with a controller thereon and in communication with the power supply such as by electrical lines, a snatch block, a tilt indicator, a safety switch or switches, a remote winch control or switch box, and a remote actuator control or switch box. The first and second frames have a lot of additional components (such as legs or main axle, pivot arms, etc.) respectively to each other.
This lifting mechanism is complex and massive.
Thus, there is a great need in the art for portable lifting devices to lift the objects (on the assigned high level), for example, such as construction materials, machinery equipment through window opening into the building under construction, and/or to lift and unload, for instance a massive furniture (such as piano, etc.), through window opening.
OBJECT AND ADVANTAGES OF THE INVENTION
Accordingly, several objects and advantages of the present invention are to provide the lifting, loading and/or unloading of the objects.
It is another object of the invention to provide the possibility of the object lifting, loading and/or unloading through the openings/apertures in the limited space area between buildings, where the cranes can not be successfully used,
It is still further object of the invention to reduce the time and expenses of the object lifting on the high level and loading and/or unloading into the closed space with the opening/aperture.
It is still another object of the invention to increase the safety and efficiency of the object lifting on the high level and loading and/or unloading into the closed space with the opening/aperture.
It is still another object of the invention to increase the safety and efficiency of the object lifting on the high level and loading/unloading into the closed space with the opening/aperture.
It is still further another object of the invention to reduce the time and expenses of the processes of the lifting device installation.
Still, further objects and advantages will become apparent from a consideration of the ensuing description accompanying drawings.
REFERENCES:
patent: 1646133 (1927-10-01), Bechman et al.
patent: 4068827 (1978-01-01), Fanning et al.
patent: 4266904 (1981-05-01), Fadness
patent: 6065621 (2000-05-
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