Amusement devices: toys – Material or article handling device
Patent
1993-06-29
1995-02-07
Hafer, Robert A.
Amusement devices: toys
Material or article handling device
446425, 294112, A63H 3330, A63H 1712, B66C 100
Patent
active
053871480
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a grab for a toy crane, said grab having two two-armed levers adapted to grip an object by mutual movement above their axis of rotation, said levers being hinged at at least two places along their axis of rotation.
The DE Patent 833 169 discloses such a grab which is suspended from a crane arm in two separate cords. The grab can be raised and lowered with operating means on the crane with simultaneous rolling up or rolling out of both cords, and the grab can be closed or opened by shortening or extending one of the cords with respect to the other. This known grab requires a separate cord for its opening/closing function and cannot therefore be retained in a closed state without this separate cord.
Also U.S. Pat. No. 2,166,854 shows such a crane grab, but whose jaws have suspension points outside their common pivot shaft, and the jaws are connected in these points with a common, carrying cord. Another cord is connected with the pivot shaft, and the jaws of the grab can be opened and closed by different pull in these cords. However, the jaws of the grab have no mutually intersecting parts like in the present invention.
GB 619 367 shows a toy crane with a grab whose parts intersect each other in a common fulcrum, and these parts are just hinged in this single fulcrum.
SUMMARY OF THE INVENTION
The present invention provides a grab which is inexpensive to produce, is functional and is realistic in use.
It is first and foremost possible to manufacture the two two-armed levers of the grab as identical parts, which is an advantage in terms of production. Further, it is hereby possible to let the two levers intersect each other seen in projection along the axis of rotation, so that their mutual movement about the axis of rotation will be a scissors-like movement. This movement makes it possible to use the gravitational pull from the object which the grab carries to intensify the grip of the grab of the object, which can hereby be retained safely by the grab at any time.
When the hinges are constructed as integrated parts of the levers, an additional productional advantage is obtained since no separate shaft or other hinge device is needed.
The grab of the invention lends itself for use with a crane where a U-shaped loop on an endless cord carries the grab.
The gripping face of the grab, which is advantageously so constructed as to provide relatively great friction between the gripping face of a grab and the objects which is gripped.
BRIEF DESCRIPTION OF THE DRAWINGS
A preferred embodiment of the invention will be described below with reference to the drawing, in which
FIG. 1 is a perspective view of a grab of the invention carrying an object,
FIG. 2a shows the two halves of the grab of FIG. 1, seen from the side,
FIG. 2b shows the assembled grab, seen from the side,
FIG. 3a shows the two halves of the grab, seen from above, and
FIG. 3b shows the assembled grab, seen from above.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
A grab 10 consists of two identical halves 11 preferably made of plastics. Each half 11 has a gripping member 12 formed as a rectangular plate. Two substantially box-shaped parts 13 and 14 are provided from the upper edge of the gripping member 12, said parts extending mutually in parallel at a certain distance from each other and forming an angle with the gripping member 12 which is approximately a right or a slightly obtuse angle. The inner side of the gripping members 12 is formed with a part 19 which has ribs 20 on the part of its face which is directed away from the gripping member 12. The part 19 is preferably made of rubber or another material having a relatively great coefficient of friction.
From the free end of the box-shaped part 14, a bracket 15 extends further forwardly and offset toward the other box-shaped part 13. The bracket 15 carries two uprights 23 which have depressions 22 at the top serving as bearings for the shaft 21 of a pulley 16.
An incision 24 is provided at the free end of the box-shaped part 14, said inc
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patent: 149143 (1874-03-01), Morris
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Dideriksen Erling T.
Pagel Kim
Hafer Robert A.
Interlego A.G.
Muir D. Neal
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