Handling: hand and hoist-line implements – Hoistline attached load supporting frame – Load capturing supports
Patent
1991-02-01
1992-05-26
Cherry, Johnny D.
Handling: hand and hoist-line implements
Hoistline attached load supporting frame
Load capturing supports
294 8235, 294 85, B66C 164
Patent
active
051163411
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a lifting shackle. More particularly, but not exclusively, it relates to a lifting shackle for raising longitudinally extending loads by means of one end thereof. One example is a lifting shackle for raising lift guide rails, and such a shackle will be described in the present application. However, it will be appreciated that shackles embodying the present invention may also be used to raise metal girders and the like.
Lift guide rail sections are generally 5 meters long and may weight up to 500 lbm. They take the form of an elongate guide rail provided at its foot with a pair of laterally extending flanges. One guide rail section may be attached to an adjacent one by means of fish plates bolted through fish plate holes provided in the flanges at or near each end of the guide rail section.
Hitherto, such guide rail sections have been raised by use of winch hooks and/or slings connected directly to the fish plate holes in the lateral flanges of the guide rail section. However, this is not an ideal method for installing guide rails because of the difficulty of controlling the movement and orientation of a guide rail section as it is raised and as it is lowered into position. Furthermore, the sections are generally stacked in a horizontal disposition but must be installed in a lift shaft in a vertical disposition. Existing methods of lifting cannot always deal with the conversion from horizontal to vertical.
Particularly in the case of high speed, high rise lifts, but also to a lesser extent with other lifts, it is important that the final guide rail assembly is vertical throughout its length and that there are no marked discontinuities where the sections join one another. With conventional methods of lifting guide rails, it is often not easy for those installers working in a lift shaft to ensure that the guide rail fulfills the above conditions.
It is an object of the present invention to provide a lifting shackle which will overcome or reduce the above disadvantages and thereby ease installation of a lift guide rail or the like.
According to the present invention there is provided a lifting shackle comprising a head plate means having or being connected to an aperture, a pair of load supporting arm means each attached pivotably to said head plate means at respective points substantially equi-distant from a vertical, in use, axis of the head plate means passing through the aperture, and means at or near the remote end of each of said load supporting arms for engaging a load to be lifted.
Preferably each one of said pair of load supporting arm means comprises a pair of elongate arms rigidly connected together to define in horizontal cross section a U-shaped channel between the arms, said channel being dimensioned to accommodate a lateral edge of a load to be lifted.
The means to engage the load to be lifted may each comprise a removable load attachment bar passing through opposed apertures in the arms of the U section and through an aperture adjacent a lateral edge of the load which is accommodated in the channel between the U section arms.
The removable load attachment bars may each be locked in place by a pair of clip means affixable to exposed opposite ends of the attachment bar.
The clip means may be retained by chains attached to the respective load supporting arm means.
A pair of load adjustment screw means may be provided, one in each load supporting arm means and passing through one of the arms of the U section, to bear against a load adjacent its lateral edge and urge it towards abutment with the other arm of said U section, whereby the position of the load within the channels of the load supporting arm means may be adjusted.
An embodiment of the present invention will now be more particularly described by way of example and with reference to the accompanying drawings, in which:
FIG. 1 is a front elevation of a preferred embodiment of lifting shackle, shown supporting a lift guide rail;
FIG. 2 is a side elevation of a lifting shackle of FIG. 1;
FIG. 3 is a plan view o
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British Guide Rails Limited
Cherry Johnny D.
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