IMPROVEMENTS IN THE GRINDING OF THE EDGES OF TOOLS AND IN THE APPARATUS OR MEANS EMPLOYED THEREIN و
Year: 1883

page_text: LETTERS PATENT to Alexander Francis Garden Brown of Glasgow in the
County of Lanark North Britain-for an Invention of "IMPROVEMENTS IN
THE GRINDING OF THE EDGES OF TOOLS AND IN THE APPARATUS OR MEANS
EMPLOYED THEREIN
و"
PROVISIONAL SPECIFICATION left by the said Alexander Francis Garden
Brown at the Office of the Commissioners of Patents on the 10th October
1883.
ALEXANDER FRANCIS GARDEN BROWN, of Glasgow, in the County of Lanark,
North Britain, "IMPROVEMENTS IN THE GRINDING OF THE EDGES OF TOOLS AND
IN THE APPARATUS OR MEANS EMPLOYED THEREIN "
This Invention which relates to improvements in grinding the edges of tools has
reference to the grinding of the edges of such tools as chisels, gouges, plane-irons,
and other tools used in turning, planing or operating upon either wood or metal
and has for its object to effect the said grinding with accuracy and without the
employment of skilled labour.
The Invention Consists in applying to an ordinary grinding wheel whether of stone,
or emery, or other suitable grinding material, a series of radial rests upon which the
tools are supported or guided while being held against the face of the revolving
stone by the operator.-The rests are arranged radially over the stone, and are so
formed as to fit over or Coincide with the shape of the stone and are supported in
position by side brackets or supports forming Castings which are attached to the
framing upon which the stone is mounted and revolves, the said brackets being
preferably formed as quadrants or as Corresponding to the Contour of the stone-
The rests are Capable of being adjustably fixed within the said side supports or
brackets by set screws, or their equivalent, and the flat surface of the bridge of
each of the said rests upon which surface the back of the tool rests when held in
position thereon by the operator, is so formed as to be always truly horizontal; and

page_text: the angle made with the said surface of the rest and the periphery or face of the
stone always remains the same or practically so although the adjustment of the rest
is, or may be, so varied according to the diameter of the stone or the wearing of the
same. By this arrangement of a series of radial rests over the face of the stone a
Corresponding number of different grinding angles are produced to suit the various
angles or cutting edges to be given to the tools.
In lieu of the herein before described arrangement of a series of radial rests, I
may employ one rest only in which Case I so hinge or joint the bridge of the rest
as to vary the angle of the flat surface of the said bridge with the face of the stone
according to the Cutting angle required to be given to the tool.
1

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Alexander Francis Garden Brown in the Patent Office on the 9th.
April 1884.
ALEXANDER FRANCIS GARDEN BROWN of Glasgow, in the County of Lanark
North Britain "IMPROVEMENTS IN THE GRINDING OF THE EDGES OF TOOLS AND
IN THE APPARATUS OR MEANS EMPLOYED THEREIN
"
My said Invention which relates to apparatus for grinding the edges of tools has
reference to the grinding of such tools, as chisels, gouges, plane-irons, and other
tools used in turning, planeing, or operating upon wood or metal and has for its
object to effect the said grinding with accuracy and without the employment of
skilled labour.
The Invention consists in applying to an ordinary grinding wheel, whether of
stone, or emery, or other grinding material, a series of radial rests upon which the
tools to be ground are supported or guided the said rests being so arranged radially
over the face of the stone as to prevent a series of different angles which may be
required to be given to different tools.-The rests are formed with arms which are
attached to the side brackets or framing of the grind-stone, the arms sliding in
grooves in the said brackets and being secured in position by thumb-screws or
equivalent devices so that the rests can be suitably adjusted to take up the wear of
the stone. As a modification of this arrangement one rest only may be employed,
in which the bridge of the rest is jointed to the side of the arms so as to vary the
angle of the flat surface of the said bridge with the face of the stone according to
the cutting angle required for the tool.
And in order that my said Invention may be properly understood I now proceed
more particularly to set forth the system, inode or manner in or under which the
same is or may be used or practically carried into effect, reference being had to the
accompanying Drawings and to the Letters and Figures, marked thereon, that is to
Bay :-
Figure 1, of the Drawings represents in side elevation the apparatus constructed
according to the first arrangement of my said Invention.
Figure 2, is a plan and Figure 3, a front elevation of the same.
Figures 4, 5 and 6, of the second Sheet of Drawings representing the
arrangement as a modification of my said Invention.
With reference to Figures 1, 2 and 3, the table A, of the grind stone has attached
to it the side brackets or castings B, between which the grindstone S revolves, the
said brackets receiving the arms c, of the tool rests C, in the grooves b; the said
grooves being preferably formed alternately at the outside and inside of the
Brackets B, to facilitate the radial arrangement of the arms c.-The bridges or
flat surfaces C, of the rests are formed horizontal, as shewn more particularly in
Figure 1, so that by arranging a number of rests, in the manner shewn in the
said Figure, over the face of the stone, a corresponding number of different angles
are made by the said horizontal surfaces C, with the face of the stone S, which
angles are given to the tools when held horizontally against the face of the stone
by the operator.
By the hereinbefore described arrangement and construction of the rests the
various grinding angles always remain the same or practically so as the stone
wears, and as it becomes necessary to take up the wear by adjusting the arms c, of
the rests within the grooves b; the said arms being secured in position by the
thumb-screws c¹, so as to keep the inner edges of the rests close up to the face of
the stone

page_text: With reference to the modification shewn on Sheet 2, of the Drawings in which
Figure 4, is a side elevation, Figure 5, a front elevation and Figure 6, a plan of the
arrangements, the bridge or flat surface C', of the rest is pivoted to the side
arms c, upon the pins o², the position of the bridge being regulated by the
quadrantal slots o³, formed in the side portions 02, of the bridge, pins c, formed
upon the arms c, passing through the said slots and being provided with the
thumb-screws c, to clamp the sides C, of the rest against the sides of the arms c.-
In using this arrangement therefore to be applicable to the providing of a variety
of angles for different tools, it is only necessary to adjust the bridge C₁, of the rest
upon its pivot c³, so as to form the required angle with the face of the stone S, a
dial c, being provided upon one of the side portions C¹, of the bridge to ascertain
the proper and exact angle required. In this arrangement the wear of the stone is
taken up by adjusting the arms c, in the slots 6 of the casting B in a similar manner
as described with reference to the first arrangement of my said Invention, that is to
say, at whatever angle the tool rest C³, may be secured with regard to the
periphery of the stone, the grinding angle is always maintained as the stone wears
and as it becomes necessary to adjust the radial arms c.
Having now described and particularly ascertained the nature of my said
Invention and the system, mode or manner in or under which the same is or may
be used or practically carried into effect, I would observe in conclusion that I do
not limit myself to the precise construction of parts shewn in the Drawings as the
same may be varied without departing from the nature of my said Invention, for
instance in the arrangement shewn in Sheet 1, of the Drawings one only of the
tool rests C, may be employed so as to provide one grinding angle, or I may
employ two or a large number of such rests as described with reference to the first
arrangement of my said Invention, but what I consider to be novel and original
and therefore claim as the Invention secured to me by the hereinbefore in part
recited Letters Patent is :-
:-
First: The apparatus for the grinding of tools consisting of the rests C, formed
with the radial side arms c, sliding in grooves b; so as to adjust the rests C to the
face of the stone, whilst maintaining the grinding angle in the said adjustment
substantially as herein before described with reference to Figures 1, 2, and 3, of the
accompanying Drawings.
Second: The series of radially arranged tool rests, presenting a series of different
grinding angles substantially as herein before described with reference to Sheet 1,
of the Drawings.
Third. The adjustable rest C₁, pivoted to the radial side arms c, and adjustably
secured thereto, so as to provide a number of different grinding angles, the required
angle being always maintained by the radial adjustment of the arms c, substantially
as herein before described with reference to Sheet 2, of the accompanying Drawings.
In Witness Whereof I the said Alexander Francis Garden Brown have hereunto
set my hand and seal this eighth day of April in the year of our Lord one
thousand eight hundred and eighty four.
ALEAF.
F. G. BROWN
(L.S.)