Handling: hand and hoist-line implements – Grapple – Lewises
Patent
1995-05-30
1996-12-03
Cherry, Johnny D.
Handling: hand and hoist-line implements
Grapple
Lewises
294 8231, B66C 166
Patent
active
055801153
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a load-engaging device for hoisting concrete building elements.
BACKGROUND ART
A device of the kind referred to above is described in DE Patent Publications Nos. 3,012,278 and 3,012,280, relating to an apparatus for suspending a concrete body in a hoisting apparatus. In this apparatus, the load-engaging tackle comprises a suspending shackle with a link eye extending through a link bore through the middle of the body, and an inadvertent release of the head of the lifting bolt is prevented by the manipulating arm abutting against a rib in this suspending shackle, if the situation entails a risk of such a release.
DISCLOSURE OF THE INVENTION
It is the object of the invention to provide a load-engaging device of the kind referred to initially that allows forces to be exerted on the lifting bolt at an oblique angle of e.g. 45 degrees with the surface of the concrete element without risk of the head of the lifting bolt being released, said device at the same time being capable of use with various hoisting-connecting means.
Since the load-engaging device according to the invention after having been attached to the lifting bolt, but before the lifting of the concrete element, is freely rotatable about this bolt in the hemispherical recess, it is always possible, with a view to oblique forces being exerted subsequently on the device, to turn the manipulating arm so as to make it face in the direction, from which the force is exerted, and since the force is transmitted to the bolt situated eccentrically relative to the abutment surface of the manipulating arm, this abutment surface will be pressed against the surface of the concrete element, so that it is no longer possible to turn the body in the recess to that position, in which the head of the lifting bolt can be released. At the same time, it is possible to attach various hoisting-connecting means to the bolt extending through the central slot in the body.
If the load-engaging device according to the invention constitutes a part of a ready-made hoisting sling comprising a chain, the end link of the chain is retained in the central slot by a bolt.
If the connecting means is a hook or a shackle, then an universal joint is used to engage the shackle or hook.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following detailed portion of the present description, the invention will be explained in more detail with reference to the exemplary embodiment of a load-engaging device according to the invention shown in the drawings, in which
FIG. 1 shows the load-engaging device in section along the line I--I in FIG. 2a,
FIG. 2a shows the device as viewed in the direction of the arrow II in FIG. 1,
FIG. 2b shows the device as viewed in the direction of the arrow III in FIG. 1,
FIG. 3 shows the device being attached to a lifting bolt,
FIG. 4 in the same manner as in FIG. 1 shows a chain secured to the device, and
FIG. 5 in the same manner as in FIGS. 1 and 3 shows the load-engaging device connected to the eye of a shackle through a universal joint.
DESCRIPTION OF THE PREFERRED EMBODIMENT
FIGS. 1, 3, and 4 show a load-engaging device according to the invention, generally designated by the reference numeral 1, as shown in the drawing placed in a securing manner about the head 2 and a part of the stem 3 on a lifting bolt embedded in a hemispherical recess 4 in a concrete building element 5, of which only a part is shown. The device 1 comprises a body 6 symmetrical about a central plane corresponding to the sectional line I--I in FIG. 2a, in the form of a central segment of a sphere with a slightly smaller diameter than the hemispherical recess 4, having a protruding manipulating arm 7 with an abutment surface 8 extending radially relative to the body 6, said surface 8 being adapted to abut against the surface 9 of the concrete element 5, when the device 1 is placed in a securing manner on the head 2 of the lifting bolt 2,3. When the device 1 is to be placed about the head 2 on a lifting bolt 2,3, the arm 7 is used for turning the bod
REFERENCES:
patent: 3499676 (1970-03-01), Haeussler
patent: 4173367 (1979-11-01), Haeussler
patent: 4398762 (1983-08-01), Haeussler et al.
patent: 4615554 (1986-10-01), Schilla et al.
patent: 4703595 (1987-11-01), Zipf et al.
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