Improvements in Apparatus for Straightening the Cutting Surfaces of Tools Employed in Machines for Planing Stone and the like.
Year: 1894

page_text: Date of Application, 3rd Nov., 1894
Complete Specification Left, 3rd Aug., 1895-Accepted, 7th Sept.. 1895
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Straightening the Cutting Surfaces
of Tools Employed in Machines for Planing Stone and the
like.
I, JAMES JACKSON of Edge Fold, Middle Hulton near Bolton in the County of
Lancaster, Quarry Master, do hereby declare the nature of my said invention to
he as follows:-
This invention relates to improvements in apparatus for straightening the cutting
surfaces of tools employed in machines for planing stone and the like to produce an
uniform even surface, and consists of two metallic pieces or plates disposed by
facings to allow of the said tools being placed therein by the blacksmith when
finished from the anvil. The blacksmith places the said tool or tools in an opening
between the metallic pieces or plates and drives the same with a hammer against a
perfectly true planed surface to thoroughly square or straighten the cutting surface
of the said tool operated upon. The metallic pieces or plates are secured by bolts
or set screws.
Dated the 2nd November 1894.
EDMUND CHADWICK, F.I.C.P.A.,
Agent.
Improvements in Apparatus for Straightening the Cutting Surfaces
of Tools Employed in Machines for Planing Stone and the
like.
I JAMES JACKSON of Edge Fold, Middle Hulton, near Bolton, in the County of
Lancaster, Quarry Master, do hereby declare the nature of this invention and in.
what manner the same is to be performed to be particularly described and
ascertained in and by the following statement and accompanying drawings :-
My said invention relates to improvements in means for trueing and straightening
the cutting surfaces or edges of tools employed in machines for planing or facing
stone and the like to produce an uniform and even surface.
The improved appliance consists of two plates or matrix-halves held together by
bolts or other suitable means and having an internal trued or planed vee recess into
which the cutting edge of the tool is introduced when finished from the anvil.
When the edge is in the vee recess the workman forces or drives. the tool
edge into the recess which acts as a matrix to shape, smooth and straighten
the edge.
The invention will be more clearly understood by a reference to the annexed
sheet of illustrative drawings.
To render the function of the appliance more easily grasped I have shown
in Figs. 1 and 2 a front and edge view respectively of a stone dressing tool a such
as is used in stone dressing machines. These tools are fastened in rows in a
tumbling tool holder and the stone is moved to and fro beneath, on a table or carrier
Price Bit.]

page_text: just as in iron planing machines. It is essential that the cutting edge a' of the tool
should be perfectly straight, because if one corner should be higher than the other
the stone would be grooved by the bent corner on the forward cut and left
untouched on the return cut or vice versa. But by the use of the appliance shown
in Figs. 3 and 4 this straightening of the cutting edge of the tool can be effected
quickly and by an unskilled person.
the bolts c.
The appliance consists of two parts or halves the fitting surfaces of which
are planed to come accurately together. In Fig. the half bis shown apart
from the half while in Fig. 4 the halves are shown securely bolted together by
The two halves enclose a T shaped recess appearing clearly in Fig. 3. The
armd of the T shaped recess is wide enough to admit the tool head a while the
cross arm d' has its upper edge planed true and smooth at so as to form when
both halves are together a vee shaped cutting, running across the appliance.
This vee shaped recess or cutting & corresponds to the shape and angle of the tool
edge a¹ and forms a mould or matrix to shape and straighten the said tool edge.
When the smith has hammered or cressed the tool to a state of completion he
introduces the head, still hot, into the appliance through the opening d till the
edge a rests in the vee shaped cutting . In Fig. 4, the inserted tool is cross
lined. The smith then hammers on the head of the tool, thereby shaping,
consolidating and straightening the edge a'. This operation finished the tool can
then be tempered and used. By means of my invention no skill and very little
time is required to straighten tool edges and the annoyance and bad workmanship
.arising from crooked tool edges are prevented.
Instead of an appliance made to treat any one tool at a time as illustrated and
described I might make the same in an extended form so as to treat several tools at
a time.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is.
1. As means for straightening the cutting edges of tools employed in machines
for planing stone and the like, the matrix or mould formed with a planed or
trued vee shaped recess into which the cutting edge of the tool is forced or
hammered and thereby shaped, consolidated and straightened, substantially in the
manner described and as shown in the drawings.
2. As means for straightening the cutting edges of tools of the indicated nature
the matrix or mould composed of the two halves or plates 6 6 held together
by bolts or other suitable means and formed with a planed or trued vee shaped
recess or cutting to receive and straighten the edge of the tool substantially as
described and shown.
Dated this 2nd day of August 1895.
EDMUND CHADWICK, F.I.C.P.A.,
Agent.