IMPROVE- MENTS IN MACHINERY FOR The Grinding of Saws.
Year: 1873

page_text: LETTERS PATENT to Alfred Lee, of No. 95, Pickering Road, Sheffield,
in the County of York, Saw Grinder, for the Invention of "IMPROVE-
MENTS IN MACHINERY FOR The Grinding of Saws.
PROVISIONAL SPECIFICATION left by the said Alfred Lee at the
Office of the Commissioners of Patents, with his Petition, on the
25th October 1873.
I, ALFRED LEE, of No. 95, Pickering Road, Sheffield, in the County
3 of York, Saw Grinder, do hereby declare the nature of the said Inven-
tion for "IMPROVEMENTS IN MACHINERY FOR THE GRINDING OF SAWS," to be as
follows:
The improvements comprise machinery adapted to grinding saws
(whether long saws, short saw, or circular saws) on both sides
simultaneously. This object is effected by mounting a pair of grind-
stones on horizontal shafts or axes, one grindstone over the other, or in
the same general vertical plane, the saw being intended to pass between

page_text: and be operated upon by them, and providing means for adjusting the
space or distance between the two cylindrical or grinding surfaces,
according to the thickness of the saw and the varying degree or extent
of grinding required.
It will be convenient to employ two pairs of horizontal guide rollers
for the saws, one pair as feeders and the other pair as deliverers, the
grinding being effected about midway in the length or distance between
the two pairs. Also to mount the shafts or axes of the grindstones in
bearings in a suitable frame, and to provide right-handed and left-handed
screws so geared or connected as to act together simultaneously and
raise or lower the said bearings and consequently to raise or lower the
grindstones with them, the arrangement being such that when the upper
grindstone is raised the lower is simultaneously lowered, and while the
upper is lowered the lower is simultaneously raised. By this means the
space or distance between the cylindrical or grinding surfaces however
it may vary becomes adjusted to the line or direction of the intended
passage of the saw between the two pairs of guide rollers.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Alfred Lec in the Great Seal Patent Office
on the 23rd April 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ALFRED
LEE, of No. 95, Pickering Road, Sheffield, in the County of York, Saw
Grinder, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-fifth day of October, in the
year of our Lord One thousand eight hundred and seventy-three, in
the thirty-seventh year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said Alfred Lee, Her special
licence that I, the said Alfred Lee, my executors, administrators,
and assigns, or such others as I, the said Alfred Lee, 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

page_text: Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN MACHINERY
·FOR THE GRINDING OF Saws," upon the condition (amongst others) that I,
the said Alfred Lee, my executors or administrators, by an instrument in
writing under my, or their, or one of their hands and scals, should par-
ticularly describe and ascertain the nature of the said Invention, and in
what manner the same was to be performed, and cause the same to bc
filed in the Great Seal Patent Office within six calendar months next and
immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Alfred Lee, do hereby declaro
the nature of my said 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 Sheet of Drawings (that is to
¡say) :-
The improvements comprise machinery adapted to grinding saws
(whether long saws, short saws, or circular saws) on both sides
simultaneously. This object is effected by mounting a pair of grind-
stones on horizontal shafts or axes, one grindstone over the other, or in
the same vertical plane, the saw being intended to pass between and be
operated upon by them, and providing means for adjusting the space or
distance between the two cylindrical or grinding surfaces, according to
the thickness of the saw and the varying degree or extent of grinding
required.
It will be convenient to employ two pairs of horizontal guide rollers
for the saws, one pair as feeders and the other pair as deliverers, tho
grinding being effected about midway in the length or distance between
the two pairs. Also to mount the shafts or axes of the grindstones in
bearings in a suitable frame, and to provide right-handed and left-handed
screws so geared or connected as to act together simultaneously and
raise and lower the said bearings, and consequently to raise or lower the
grindstones with them, the arrangement being such that when the upper
grindstone is raised the lower is simultaneously lowered, and while the
upper is lowered the lower is simultaneously raised. By this means the
space or distance between the cylindrical or grinding surfaces however
it may vary becomes adjusted to the line or direction of the intended
passage of the saws between the two pairs of guide rollers.
In order that this my said Invention may be more clearly understood,
I will now proceed to describe the same in detail, and I hereunto annex

page_text: one Sheet of Drawings illustrative of the same, and have marked the
same with figures and letters of reference, the same letter referring to
the same part in both views or Figures.
Fig. 1 is a side elevation of a machine for grinding saws constructed
in accordance with my Invention, and Fig. 2 is a front elevation of the
same.
A and B are the grindstones, between which the saws or other
materials to be ground have to pass, and which are carried on axes or
shafts C, these being supported in brackets or bearings D and D', which
are operated either up or down by the screws E and F, so that the stones
may be finely adjusted to the thickness of the saw required to be ground.
It will be observed that the screws are made right and left-hand, and
arranged in such manner that when operated upon the bearings D will
be lowered and the bearings D¹ will be raised for adjusting the space or
distance between the two cylindrical or grinding surfaces. G and H are
the two pairs of guide rollers supported in. suitable framework I, so
geared and connected that one pair act as feeders and the other pair as
deliverers. I may place these rollers so that the grindstones are about
midway in the length or distance between the two pairs. J is a suitable
framework, upon which the brackets D and D₁ are made to slide up or
down. The screws E and F are put in motion by the turning of the
shaft K, upon which are worms L gearing with worm wheels M. on the
screw shafts, and which may be accomplished by the use of the hand
wheel O and band and pulleys P and Q. R are arrows, which indicate
the direction in which the stones revolve, and it will be seen that I
arrange them so that they both revolve in the same direction and by
preference both at one speed, whereby I am enabled to grind both sides
of the saw as it passes between the stones at one operation, and with my
arrangement of the screws E and F being such that when the grind-
stone A is lowered the grindstone B is raised simultaneously, and by this
means the space or distance between them however it may vary becomes
adjusted to the line or direction of the passage of the saw between the
two pairs of guide rollers G and H.
Having thus described the nature of this my said Invention, and
shewn by Drawings in what manner the same may be performed and
carried into practice, I would have it understood that I do not claim the
precise details of construction herein shewn and described, but what I
claim as of my Invention and believe to be new is,―

page_text: Firstly. The application of the screws E and F so coupled or con-
nected together, or in one piece, in such manner that while one grind-
stone is being lowered the other will be simultaneously raised for the
purposes herein fully described and illustrated.
Secondly. The application and arrangement of the grindstones in such
manner that they will operate equally upon both sides of the saw
simultaneously, as herein fully described and illustrated.
In witness whereof, I, the said Alfred Lee, have hereunto set my
hand and seal, this Ninth day of April, in the year of our Lord
One thousand eight hundred and seventy-four.
Witness,
W. WHITEHEAD,
Patent Agent,
Halifax & Sheffield.
ALFRED LEE. (L.S.)