Improvements in the Method of and Means for Magnetically Treating Tool Blades, Forgings, Castings, and the like.
Year: 1897

page_text: Date of Application, 2nd Apr., 1897
Complete Specification Left, 1st Jan., 1898-Accepted, 12th Mar., 1898
PROVISIONAL SPECIFICATION.
Improvements in the Method of and Means for Magnetically Treating
Tool Blades, Forgings, Castings, and the like.
JOHN MCKAY, 76, Meldon Terrace, Heaton, Newcastle on Tyne, Engineer, do
hereby declare the nature of this invention to be as follows:-
Having noticed that chisels, drills and other steel tools used by engineers and
others, after having been in use for some time acquire a degree of magnetism and
that on their being heated for the purpose of dressing or sharpening the magnetism
is upset and in many cases disappears, and until corrected or re-established the
tools are easily broken.
To remedy this defect I propose to induce the necessary degree of magnetism in
the following manner, viz. :-
I construct a cell preferably of copper or iron containing a weak acid solution
with a covering of wood or other non-conducting substance on the upper side of
which is fixed a coil of covered wire or other winding to suit the shape of the
different articles to be treated. From the under side of the lid or covering hangs a
plate of zine or other electrically opposite metal to that of which the
cell is constructed, which tapers to a point or is 80 fashioned that
when the lid or covering is lowered over the cell the plate enters the
liquid at its point and is gradually immersed across its whole breadth, and
on being withdrawn the point leaves the solution last. The cell and plute afore-
said having been electrically connected with the coil or other form of winding, the
tool to be treated is first placed within the coil and the plate lowered into the
liquid contained in the cell by which means the electric current is
established and gradually increased in quantity by which the tool is
gradually magnetized: the plate is then withdrawn from the solution and the tool
removed from the coil. The lid or covering, coil and plate may be fixed to a stand
and the cell holding the solution raised until the plate is immersed. The cell and
plate may be multiplied in number.
I
Although I have mentioned steel tools as being treated by the foregoing method
may apply it to steel or iron castings forgings or the produce of the rolling mill.
As a modification I may use the dynamo to produce the current but have found
by experience that the result is not so good.
Improvements in the Method of and Means for Magnetically Treating
Tool Blades, Forgings, Castings, and the like.
I, JOHN MCKAY, of 76, Meldon Terrace, Heaton, Newcastle on Tyne, Engineer,
do hereby declare the nature of this invention and in what manner the same is to

page_text: be performed, to be particularly described and ascertained in and by the following
statement:
-
Having noticed that chisels, drills and other steel tools used by engineers and
others, after having been in use for some time acquire a degree of magnetism and
that on their being heated for the purpose of dressing or sharpening, the magnetism
is upset, and in many cases disappears, and until corrected or re-established, the
tools are easily broken.
To remedy this defect I propose to induce the necessary degree of megnetismn
in the following manner, viz.:-
I construct a coll preferably of copper or iron containing a weak acid solution
with a covering of wood or other non-conducting substance on the upper side of
which is fixed a coil of covered wire or other wire winding to suit the shape of the
different articles to be treated.
From the under side of the lid or covering hangs a plate of zinc, or other electric-
ally opposite metal to that of which the cell is constructed, which tapers to a point
or is so fashioned that when the lid or covering is lowered over the cell the point
of the plate enters the liquid and is gradually immersed across its whole breadth
and on being withdrawn the point of the plate leaves the solution last. The cell
and plate aforesaid having been electrically connected with the wire coil or other
form of wire winding, the tool to be treated is first placed within the coil and the
plate lowered into the liquid contained in the cell, by which means the electric
current is established and gradually increased in quantity by which the tool is
gradually magnetized; the plate is then withdrawn from the solution and the tool
removed from the coil. The lid or covering, coil and plate may be fixed to a stand
and the cell holding the solution raised until the plate is immersed or the plate
may be fixed in position in the cell and the solution gradually introduced and
withdrawn to produce the same result. The cell and plate may be multiplied in
number.
Although I have mentioned steel tools as being treated by the foregoing method,
may apply it to steel or iron castings, forgings or the produce of the rolling mill.
The accompanying drawing will explain more fully one method of construct-
ing the apparatus, viz. :-
(a) represents the cell containing the neid solution.
the plate to be immersed.
(c) the coil, and.
(d) the lid or covering.
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. Improvements in the method of and means for magnetically treating tool
blades, forgings, castings and the like substantially as described.
2. That the plate (b) shall be so fashioned that it enters and leaves the acid
solution at one of its corners or points.
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