Handling: hand and hoist-line implements – Grapple – Pivoted jaws
Patent
1983-10-25
1986-02-25
Marbert, James B.
Handling: hand and hoist-line implements
Grapple
Pivoted jaws
B25B 702
Patent
active
045725667
ABSTRACT:
This invention relates to a simple tool which can be used by two people manually to lift and position slabs of various thicknesses.
A slab lifter according to the invention comprises two bars adapted to rotate with respect of each other about a mutually perpendicular axis, each bar having at one end a slab-gripping portion bent at an obtuse angle A of 100 to 140 degrees towards the position of the slab-gripping portion of the other bar so that it can be inserted between adjacent slabs and together with the other slab-gripping portion can grip opposite edges of a slab to distance L apart, the distance from the axis of rotation to the slab-gripping portion of the bar being approximately equal to 0.5 L/sine (A+a) where a is an angle of zero to 5 degrees representing "toe-in" of the slab-gripping portion when gripping the slab, and the rest of the bar on the other side of the axis of rotation being of such length and shape that it can project laterally at least as far as the vertical plane of the opposite edge of a gripped slab so as to provide a handle.
REFERENCES:
patent: 1344174 (1920-06-01), Clogston
patent: 1514863 (1924-11-01), Rytell
patent: 1805604 (1931-05-01), Straka
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