Handling: hand and hoist-line implements – Hand forks and shovels – Convertible and combined
Patent
1982-08-06
1984-10-09
Cherry, Johnny D.
Handling: hand and hoist-line implements
Hand forks and shovels
Convertible and combined
294 535, 294 57, 294 59, 403 91, 403 93, A01B 122
Patent
active
044757573
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a spade having a blade which is coupled to a preferably hollow handle by means of a bearing pin so as to be pivotable and rockable in various positions. In the known embodiment of such a spade, a joint is formed by the lower end of the handle, two lugs of the spade blade which are bent upwardly perpendicularly to the spade blade and a bearing pin. The handle carries a nut which is movable relative to the lugs of the spade blade. The lugs have a plurality of surfaces which extend parallel to the bearing pin, wherein adjacent surfaces include an obtuse angle with one another. By loosening the nut it is possible to pivot the blade and tighten it in the desired direction relative to the handle, so that the spade is fixed in the adjusted position. This type of construction has the disadvantage that the thread is exposed, and, therefore, is subjected to damage and dirt, which may impair or eliminate the mobility of the nut. In addition, a high bearing pressure exists between the surfaces on the lugs of the blade and the nut, which very soon results in wear of the spade which render it increasingly useless.
It is the purpose of the invention to provide a spade in which these disadvantages are avoided and which can preferably be folded up to a small volume.
In accordance with the invention, this is achieved thereby that the handle has at its end facing the blade a plurality of surfaces extending parallel to the bearing pin, wherein adjacent surfaces include an obtuse angle with one another and wherein the bearing pin is constructed as an eccentric, and wherein, by rotating the eccentric by means of an actuating element which is fixed to the eccentric, the spade blade can be pressed against one of these plane surfaces at the end of the handle. The invention further relates to advantageous further developments.
BRIEF DESCRIPTION OF THE DRAWING
In the drawing, the subject matter of the invention is illustrated in an embodiment serving as an example.
FIG. 1 is a side view of the spade according to the invention,
FIG. 2 is a cross-sectional view taken along line II--II of FIG. 1,
FIG. 3 is a view of the bearing pin constructed as eccentric,
FIG. 4 is a front view of the bearing pin, and
FIG. 5 is an enlarged cross-sectional view of the approximately U-shaped portion of the actuating arm for the eccentric.
FIG. 6 is an enlarged view of the end of the handle provided with concave surfaces.
DETAILED DESCRIPTION OF THE INVENTION
The spade handle in its totality denoted by reference numeral 1 is constructed in two pieces and is composed of two telescoped tubes 2, 3, of which the outer spade portion 2 is provided at its free end with an internal thread 4 and the inner spade portion 3 is provided at its inner end with an external thread 5, so that the two handle portions can be screwed together internally by means of threads 4, 5. Internal thread 4 and/or external thread 5 have conical end portions, so that the thread is tightened toward the end of the screwing procedure and an impact on the handle 1 cannot loosen it. For securing the position of the inner handle portion 3 in its retracted position, resilient hooks 7 are provided on the bottom 6 of the outer handle portion 2, the hooks 7 being capable of engagement in recesses 8 of the inner spade portion 3. The tubular, inner spade portion 3 is closed to the outside or, as in the illustrated case, can be closed by means of a screw cap 9 and may serve to receive another tool 10, for example, a saw blade, whose free end is constructed as a screwdriver 11. For the insertion of the handle portion 3, it is necessary to construct the handle portion 2 of a tube into which the bottom 6 is inserted in the manner of a plug. The connection of bottom and tube can be effected by gluing.
The end 13 of the handle connected to the spade blade 12 is laterally provided with plane surfaces 14 which are surrounded by lugs 15 of the blade 12. A bearing pin 16 constructed as eccentric is arranged perpendicularly to these plane surfaces 1
REFERENCES:
patent: 951324 (1910-03-01), Mayer
patent: 984778 (1911-02-01), Remisch
patent: 1177072 (1916-03-01), Warman
patent: 2833585 (1958-05-01), Nischan
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