Tools – Tool jaw – Adjustable relationship between jaw
Reexamination Certificate
1999-09-09
2001-11-20
Hail, III, Joseph J. (Department: 3723)
Tools
Tool jaw
Adjustable relationship between jaw
C081S416000
Reexamination Certificate
active
06318217
ABSTRACT:
BACKGROUND OF THE OF INVENTION
The present invention relates to gripping pliers with the characteristics.
Such gripping pliers are known from practical application and in particular from the printed publications DE-PS 805 265 as well as DE-92 18 069 U1. In the known gripping pliers the lower extended handle and the upper extended handle cross in a joint which comprises an elongated indexing hole. The handle which constitutes the upper extended handle when the pliers are in use, forms the lower jaw while the lower extended handle when the pliers are in use, forms the upper jaw of the pliers.
A through-bolt which forms the bearing axis of the joint is star-shaped or round in cross section and in longitudinal direction of the elongated hole engages the indexing hole located in the lower extended handle with a positive fit. A leaf spring arranged without protection provides pretension to the through-bolt in its catch position, with the said leaf spring being located on the outside of the joint opposite the through-bolt. To adjust the opening width of the known gripping pliers, the through-bolt must be pushed into the joint of the pliers, against the force of the leaf spring so that its larger cross-section is pushed out of the indexing hole. Thereafter the lower extended handle can be adjusted to the desired extent in relation to the upper extended handle. As soon as the through-bolt is no longer held, the leaf spring pushes it into the engagement position in the indexing hole, and the intended opening width of the gripping pliers is fixed. With these gripping pliers the upper extended handle comprises a slot and the lower extended handle in the area of the joint is inserted through the upper extended handle. For reasons of stability the aim is to keep the dimension of the lower extended handle in the joint area to approximately half the entire thickness, so that the load bearing surfaces of the joint components resting against the indexing bolt are approximately the same for the lower extended handle as they are for the upper extended handle.
In the case of the known gripping pliers it is therefore necessary in order to undo the indexing connection, to displace, transversely to the longitudinal plane of the pliers, the indexing bolt by an amount approximately corresponding to half the thickness of the pliers. It is thus seen as a disadvantage that this travel is relatively extensive and that the free activation end of the indexing bolt in its home position laterally protrudes significantly further out than the joint.
SUMMARY OF THE INVENTION
Starting from this it is the object of the invention to create gripping pliers with a shorter activation distance of the index bolt.
Because the lower extended handle comprises a slot in the area of the joint and the upper extended handle is inserted through the lower extended handle in the area of the joint, the adjustment element in the lower extended handle incorporating the slot can be engaged in two places spaced apart from each other. This provides the option of providing two relatively narrow bearing surfaces in the lower extended handle comprising the slot, with the adjustment position of the adjustment element being attained by displacing said adjustment element by an amount equal to the width of a bearing surface transversely to the longitudinal plane of the pliers. The activation distance (travel) for adjusting gripping pliers with a joint region designed in this way is only about half of the activation distance of conventional gripping pliers.
An adjustment element which is simple to produce results if it comprises an essentially rotationally symmetrical indexing pin. In its engagement position the indexing pin can at the same time constitute the bearing axis of the joint. Furthermore, good bearing support is provided if the indexing pin comprises a first area of smaller diameter, a second area of medium diameter and a third area of larger diameter.
A particularly robust embodiment which is also insensitive to damage and dirt provides for the lower extended handle in the region of the joint to comprise two elongated indexing holes opposing each other transversely to the plane of the pliers, of which one indexing hole comprises a number of overlapping small indexing bore holes of a first bore hole diameter and of which the other indexing hole comprises a number of overlapping large indexing bore holes of a second, larger bore hole diameter; in each instance a bore hole of the first diameter and a bore hole of the second diameter are arranged coaxially in relation to each other. This embodiment is further improved in that the indexing pin in the engagement position with its second area of medium diameter engages a bore hole of the first indexing hole, and with its third area of large diameter engages a bore hole of the second indexing hole, so that the indexing pin is fixed with a positive fit in the plane of the pliers, and the indexing pin in the adjustment position with its first area of smaller diameter is longitudinally slidable so as to engage the first indexing hole, and with its second area of medium diameter is longitudinally slidable so as to engage the second indexing hole, so that the indexing pin is altogether slidable in the plane of the pliers in longitudinal direction of the indexing holes.
Preferably, the spring is a helical spring which engages an axis-parallel bore hole of the indexing pin. By way of a buttress, in the area of the joint the upper extended handle supports a pin arranged transversely to the indexing pin, with the spring being supported by said pin which penetrates the indexing pin. With this pin the indexing pin is secured so that it cannot be lost.
Finally it is advantageous if the indexing pin at its face adjacent to the first area comprises a closure which closes off the bore hole for the helical spring, to the outside.
Below, one embodiment of the present invention is illustrated by means of a drawing, as follows:
REFERENCES:
patent: 4232573 (1980-11-01), Dace, Jr.
patent: 4269089 (1981-05-01), Hastings
patent: 4296655 (1981-10-01), Tesoro
patent: 4581960 (1986-04-01), Putsch et al.
patent: 4669340 (1987-06-01), Igarashi
patent: 805265 (1951-05-01), None
patent: 9218069 (1993-09-01), None
Emhardt Frank
Krugmann Joachim
Schmidt Jens-Uwe
Schwandrau Sieghardt
Suhr Frank
Hail III Joseph J.
Thomas David B.
VBW Vereinigte Beckersche Werkzeugfabriken GmbH & Co.
Woodbridge Richard C.
Woodbridge & Associates P.C.
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