IMPROVEMENTS IN MACHINERY OR APPARATUS FOR GRINDING SAWS AND OTHER METAL SURFACES
Year: 1871

page_text: LETTERS PATENT to William Albert Jackson, of Sheffield, in the
County of York, for the Invention of "IMPROVEMENTS IN MACHINERY
OR APPARATUS FOR GRINDING SAWS AND OTHER METAL SURFACES."
Sealed the 13th February 1872, and dated the 28th September 1871.
PROVISIONAL SPECIFICATION left by the said William Albert Jackson
at the Office of the Commissioners of Patents, with his Petition,
on the 28th September 1871.
I, WILLIAM ALBERT JACKSON, of Sheffield, in the County of York,
do hereby declare the nature of the said Invention for "IMPROVEMENTS
IN MACHINERY OR APPARATUS FOR GRINDING SAWS AND OTHER METAL SURFaces,”
to be as follows:-
This Invention relates to that class of grinding machinery wherein a
top stone or feeding roll is mounted above the grinding roller, the axis
of such top stone or feeding roll being mounted in a carriage capable
of being elevated and depressed by means of vertical screws to suit the.
thickness of the saw blade or other article to be ground.
-

page_text: In machines of this class there has always existed a great difficulty in
grinding the surface of articles of irregular thickness or form, and it is
to remedy this defect and to economize labor that my present Invention
is designed.
The Invention consists principally in mounting the axis of the top
stone or feeding roll in vertically slotted bearings in the carriage so that
the weight of the top stone or feeding roll itself produces the requisite
degree of pressure upon the saw or other article, at the same time that
the bearing or the axis of the stone is capable of being raised or lowered
by hand as required. If the bearings are simply slotted or elongated
vertically, the axis of the top stone or feeding roll may be raised by
means of a lever or levers, and this raising of the stone at will not only
allows the workman to grind irregular shapes or thicknesses, but also
greatly economizes labor by obviating the necessity for a workman at the
back of the machine to receive the saw or other article as it passes
through. The operator passes one end of the saw or article through as
far as he desires, and then by raising the top stone or roll he can
withdraw it and pass the other end through.
In some cases I prefer to have circular instead of slotted bearings for
the axis, and to raise and lower the said bearings, as required, by the
aid of wedges placed beneath them, which wedges are thrust forward
or withdrawn by means of levers or otherwise, or the bearing may be
formed by an excentric bush, and the axis be raised or lowered by
turning these excentric bushes round either by levers or by spur wheels
and pinions, or by other convenient means, the novelty of these
arrangements being that the axis of the top stone or feeding roll is
capable of being raised and lowered in its carriage at will at the same
time that the carriage itself is capable of adjustment on the standards
or frame in the usual manner..
When using vertically slotted bearings, if the weight of the top stone
or feeding roll should not be sufficient to give the requisite pressure,
this weight may be increased by clamping or fixing weights or collars
to the sides of the stone, or by hanging weights on to the axis of the
same.

page_text: lowering arrangements above referred to are to be applied to the said bar
or block instead of to the top stone or roll, and a small pair of feeding
rollers may be employed to draw the saw blade or other article through
the machine.
filed by the said William Albert Jackson in the Great Seal Patent
Office on the 28th March 1872.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
ALBERT JACKSON, of Sheffield, in the County of York, send greeting.
"
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-eighth day of September, in the
year of our Lord One thousand eight hundred and seventy-one, in
the thirty-fifth year of Her reign, did, for Herself, Her heirs and
successors, give and grant unto me, the said William Albert Jackson,
Her special license that I, the said William Albert Jackson, my
executors, administrators, and assigns, or such others as I, the said
William Albert Jackson, my executors, administrators, and assigns,
should at any time agree with, and no others, from time to time and at
all times thereafter during the term therein expressed, should and
lawfully might make, use, exercise, and vend, within the United
Kingdom of Great Britain and Ireland, the Channel Islands, and
Isle of Man, an Invention for "IMPROVEMENTS IN MACHINERY OR Apparatus
FOR GRINDING SAWS AND OTHER METAL SURFACES," upon the condition
(amongst others) that I, the said William Albert Jackson, my exe-
cutors or administrators, by an instrument in writing under my, or
their, or one of their hands and seals, should particularly describe
and ascertain the nature of the said Invention, and in what manner
the same was to be performed, and cause the same to be filed in the
Great Seal Patent Office within six calendar months next and imme-
diately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said William Albert Jackson, do hereby
declare the nature of the said Invention, and in what manner the
same is to be performed, to be particularly described and ascertained

page_text: in and by the folowing statement and accompanying Drawings (that is
to say):
This Invention relates to that class of grinding machinery wherein a
top stone or feeding roll is mounted above the grinding roll, the axis of
such top stone or feeding roll being mounted in a carriage capable of
being elevated and depressed by means of vertical screws to suit the
thickness of the saw blade or other article to be ground.
In machines of this class there has always existed a great difficulty
in grinding the surface of articles of irregular thickness or form, and
it is to remedy this defect and to economize labor that my present
Invention is designed.
The Invention consists principally in mounting the axis of the top
stone or feeding roll in vertically slotted bearings in the carriage, so that
the weight of the top stone or feeding roll itself produces the requisite
degree of pressure upon the saw or other article, at the same time that
the bearing or the axis of the stone is capable of being raised or lowered
by hand as required.
If the bearings are simply slotted or elongated vertically the axis of
the top stone or feeding roll may be raised by means of a lever or levers,
and this raising of the stone at will not only allows the workman to
grind irregular shapes or thicknesses, but also greatly economizes labor
by obviating the necessity for a workman at the back of the machine to
receive the saw or other article as it passes through. The operator
passes one end of the saw or article through as far as he desires, and
then by raising the top stone or roll he can withdraw it and pass the
other end through.
In some cases I prefer to raise and lower the bearings of the top roll,
as required, by the aid of wedges placed beneath them, which wedges
are thrust forward or withdrawn by means of levers or otherwise, or the
bearing may be formed of an excentric bush and the axis be raised or
lowered by turning these excentric bushes round, either by levers, or by
spur wheels and pinions, or by other convenient means, the novelty of
these arrangements being that the axis of the top stone or feeding roll
is capable of being raised and lowered in its carriage at will, at the same
time that the carriage itself is capable of adjustment on the standards or
frame in the usual manner.

page_text: When using vertically slotted bearings, if the weight of the top stone
or feeding roll should not be sufficient to give the requisite pressure,
this weight may be increased by clamping or fixing weights or collars
to the sides of the stone, or by hanging weights on to the axis of the
same.
It will be evident that a pressure bar or block may be substituted for
the top stone or feeding roll if preferred, in which case the raising and
lowering arrangements, above referred to, are to be applied to the said
bar or block instead of to the top stone or roll, and a small pair of
feeding rollers may be employed to draw the saw blade or other article
through the machine.
Such being the nature and object of my said Invention for " Improve-
ments in Machinery or Apparatus for Grinding Saws and other Metal
Surfaces," I will now proceed to describe more in detail the manner in
which the same is to be or may be performed or carried into practical
effect, and in order that the same may be clearly understood I have
annexed hereunto a Sheet of Drawings illustrative thereof, and have
marked the same with figures and letters of reference corresponding
with those in the following explanation thereof :-
Fig. 1 in the annexed Drawing is a plan or horizontal view of the
improved machine as seen from above. Fig. 2 is a side elevation, and
Fig. 3 a front view of the same.
a, a, are the standards or framing of the machine; b, b, the
bottom or grinding roll supported in suitable fixed bearings, and c, c,
the top or feeding roll, the axis d, d, of which is mounted in a carriage
e, e, working in vertical slides in the standards and capable of being
elevated and depressed to suit the thickness of the saw blade (or other
article to be ground) by means of two screws f. f. These screws f, f,
have each keyed on near the top a worm wheel, g, g, the said worm
wheels being in gear with two worms h, h, keyed on a transverse shaft
provided with a hand wheel i, i, for the purpose of actuating them when
required. The bearings k, k, of the top roll c, c, are slotted vertically as
seen at Fig. 2, so that the weight of the top roll bears upon the saw
blade or other article being ground, but the said roll c, c, can be raised
up when desired by means of two levers 1, 1, the shorter arms of which
pass beneath the axis d, d, of the roll whilst their longer arms are
connected together by a hand rail m, m, so that they form in effect a

page_text: single lever and lift the roll evenly. n, n, are the driving pulleys for the
bottom or grinding roll 6, 6, and o, o, are the driving pulleys for the top
or feeding roll c, c, the motion being communicated. (by preference) by
a pair of skew spur wheels o*, o*, to prevent "backlash."
The attached view, Fig. 4, illustrates the method of raising and
lowering the top roll by means of wedges p, p, actuated by the levers
1, 2, in which case the shorter arms of the levers instead of passing under
the axis (as in the former case) are slotted and act upon pins attached
to the wedges p, p.
Fig. 5 shows the bearing for the axis of the top roller formed of an
excentric bush q, q, by turning round which by the aid of the lever 1, 1,
or other convenient means the desired object is attained.
Having now described the nature and object of the said Invention for
"Improvements in Machinery or Apparatus for Grinding Saws and
other Metal Surfaces," together with the manner in which the same is
to be or may be performed or carried into practical effect, I wish it to be
understood that I claim as my Invention the several arrangements shown
in the annexed Drawings and herein-before described (or any mere modifi-
cation thereof) for mounting the top roll (or a pressing bar or block
substituted therefor) in such a manner that it can be raised and lowered
in its carriage at will, at the same time that the carriage itself is
capable of adjustment on the standards or frame in the usual manner,
substantially as herein-before set forth.
In witness whereof, I, the said William Albert Jackson, have
hereunto set my hand and seal, this Twenty-third day of March, 2
in the year of our Lord One thousand eight hundred and
Witnessed by
GEORGE DAVIES, C.E.,
Patent Agent,
Manchester.
. W. ALBERT JACKSON.
(L.S.)