Implements or apparatus for applying pushing or pulling force – Thill-coupling jack
Patent
1984-06-21
1986-02-11
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Thill-coupling jack
B25C 1100
Patent
active
045695059
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a clip removing forceps for bending open skin clips, comprising two branch elements pivotally joined together, one of which has at its free end two parallel anvils which are insertable between the skin and the crown of the clip to be bent open, and also comprising a bending punch at the free end of the other branch element, said bending punch dipping between the two anvils when the branch elements are pivoted together.
Clip removing forceps of this type are preferably made of metal and serve to bend open the skin clips used to hold the edges of a wound together and remove them from their position once the wound has healed.
Normally, the two branch or handle elements of such a clip removing forceps are pivotally joined by a hinge pin, e.g. by a screw or rivet. Such an arrangement is complicated and expensive to produce as at least three parts have to be joined together.
The object of the invention is to improve a clip removing forceps of this type such that it is simpler to manufacture, in particular with the aim of designing such clip removing forceps as disposable articles.
With regard to a clip removing forceps of the type described above, this object is accomplished according to the invention in that one of the two branch elements encircles the other branch element in the shape of a U in the region of pivotal connection, that one of the two branch elements bears on its side walls facing the other branch element projections arranged at the axis of rotation, that the other branch element has circular recesses for receiving the projections, that these projections have a circular cross section corresponding to that of the recesses, whereby two opposite sides of the projections are flattened, and that a groove runs from each circular recess to the edge of the other branch element, the width of this groove corresponding at least to the distance between the flattened sides of the projections but being smaller than the diameter of the circular recesses, and this groove being aligned such that in the operating position of the two branch elements the curved side portions of the projections rest at least partially on the cylindrical side walls of the recesses.
This arrangement enables the two branch elements to be pivotally connected directly with each other without separate parts, such as hinge pins etc., being necessary. It is sufficient for the two branch elements to be fitted together such that the flattened projections slide along the grooves in the other branch element and into the recesses. The branch elements are subsequently pivoted into their operating position. The curved portions of the projections are thereby guided exactly in the recesses with their circular cross section.
It is advantageous for the groove to have the same depth as the recess but the recesses may also be formed by a single throughbore.
The groove and the flattened portions of the projections are preferably oriented such that the projections may be inserted into the groove only when the branch elements for between them a greater angular aperture than that occurring during operation.
In a preferred embodiment, both branch elements have locking projections on their side faces facing each other, these locking projections sliding past each other when the branch elements are closed from their fitting position into their operating position and preventing any return movement from the operating position into the fitting position. This ensures that the branch elements cannot be detached from each other once they have been assembled. It is sufficient to slide one branch element into the other in the direction of the grooves in this other branch element and, subsequently, to close the two branch elements. The two locking projections thereby slide past each other until the clip removing forceps is in its operating position, i.e. in a position in the region between the normal open position and the closed position.
It is advantageous for at least one of the two locking projections to have an inclined sliding surface for the
REFERENCES:
patent: 1423866 (1922-07-01), Miller
patent: 2202984 (1939-03-01), Drypolcher
patent: 2762604 (1953-01-01), Misson
patent: 4026520 (1977-05-01), Rothfuss et al.
patent: 4487394 (1984-12-01), Rothfuss et al.
Aesculap-Werke AG
Watson Robert C.
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