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My
invention will be more clearly understood by reference to
the accompanying drawings, forming part of this specification,
in which—
Figures 1 and 3 are sectional views, and Fig. 2 a side elevation,
of the instrument, respectively, showing its parts in different
positions; Fig. 4, an edge view of the back of the guidepiece
and its chisel-edge formed on its lower end; Fig. 5, an enlarged
view of the jaws; Fig. 6, a top view of the fulcrum and guide-piece
with the jaws and lever removed; Fig. 7, a bottom end view
of the jaws and lever removed from the guide-piece and fulcrum.
Like letters of reference indicate corresponding parts in
the several figures.
A and B are the jaws, and C the lever joined to the latter
one, with handle m formed at its top.
D is the guide-piece, made hollow, of malleable metal, with
two perpendicular parallel half-round grooves, ff,
opposite to each other, in its walls, which latter are scrolled
at one side to form a guard for the hand in operating, and
having a chisel-edge, g, formed on the lower end of
one wall.
E is the fulcrum rigidly attached to the said guide-piece.
In Fig. 5, h is a segmental-shaped pin formed upon
the jaw B at right angles to its inner edge, made to engage
the segmental-shaped recess i in the jaw A, and serving as
the pivot of the jaws. p in the same figure is a shoulder
formed in the jaw B, into which the upper end of the jaw A
fits snugly. Around the pivot of these jaws for a given radius
the jaws are provided on either side with hemispherical enlargements
jj, (shown clearly in Fig. 7,) to give strength to
the pivot, and also that the jaws may be confined thereby
in position by their engagement with the half-round grooves
ff of the guide-piece D and for interlocking the jaws
with the fulcrum, as will hereinafter appear.
In Figs. 4 and 6, kk are the upper edges of the walls
of the grooves ff, which, after the introduction of
the jaws A and B into the hollow of the guide-piece D, are
bent inwardly sufficiently to keep the jaws from being withdrawn
therefrom. The said grooves do not extend entirely through
the bottom of said guide-piece.
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