IMPROVEMENTS IN THE MODE OF GRINDING CIRCULAR SAWS
Year: 1857

page_text: LETTERS PATENT to John Wheatman and John Smith, Saw Manu-
facturers, of Sheffield, in the County of York, trading under the style or
firm of Wheatman and Smith, for the Invention of "IMPROVEMENTS IN
Sealed the 11th September 1857, and dated the 14th March 1857..
PROVISIONAL SPECIFICATION left by the said John Wheatman and John.
Smith at the Office of the Commissioners of Patents, with their Petition,
on the 14th March 1857.
We, JOHN WHEATMAN and JOHN SMITH, Saw Manufacturers, of Sheffield,
in the County of York, trading under the style or firm of Wheatman and
Smith, do hereby declare the nature of the said Invention for "IMPROVEMENTS
IN THE MODE OF GRINDING CIRCULAR SAWS," to be as follows:-
The said Invention relates to the substitution of an ordinary grinding stone
for the "lead lap" and emery at present used in grinding circular saws. The
machines in use are fitted with a cast-iron wheel, on which is cast a periphery
of lead, which acts against the surface or face of the saw in process of
grinding. The saw is fixed vertically, parallel with the axle of the grinding
body; emery is the material used for abrasion; it is mixed with oil and applied
between the saw and the periphery of lead or "lead lap." This is a com-
paratively expensive process, in lieu of which it is proposed to make use of a
common sand or grinding stone.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said John Wheatman and John Smith in the Great Seal Patent
Office on the 14th September 1857.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, JOHN
WHEATMAN and JOHN SMITH, Saw Manufacturers, of Sheffield, in the County
of York, trading under the style or firm of Wheatman and Smith, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Fourteenth day of March, in the year of our Lord
One thousand eight hundred and fifty-seven, in the twentieth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto us, the
said John Wheatman and John Smith, Her special licence that we, the said
John Wheatman and John Smith, our executors, administrators, and assigns,
or such others as we, the said John Wheatman and John Smith, our 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 THE MODE OF GRINDING
CIRCULAR SAWS," upon the condition (amongst others) that we, the said John
Wheatman and John Smith, our executors or administrators, by an instru-
ment in writing under our, 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
immediately after the date of the said Letters Patent.
NOW KNOW YE, that we, the said John Wheatman and John Smith, do
hereby declare the nature of our said Invention, and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement (that is to say) :-
The saw-grinding machines at present in use consist of a table or bed plate
fixed on a horizontal shaft, to which rotary motion is imparted during the
process of grinding by gearing or bands from the driving shaft, and to this
table or bed plate the saw is affixed. The grinding body consists of a cast-
iron or other metal wheel with lead periphery, which is secured on a shaft
or axle fixed parallel with the surface of the vertical bed plate, and revolving
on moveable bearings; these bearings are attached to a traverse frame or
carrier, which is moved backward and forward during the operation of

page_text: grinding in a direction parallel with the axle of the wheel and face of the
bed plate. The machine can be so adjusted by screws that the distance of
the shaft or axle from the face of the bed plate may be regulated at pleasure,
and when rotary motion is communicated to the shaft, which also acquires the
traverse motion of the frame or carrier, the whole surface of the saw being
ground is brought into equal contact with the edge or periphery of the grinding
body, and subjected to equal abrasion from emery, or such other like material
as, mixed with oil or water, may be introduced between the revolving surfaces
in contact.
Now, our Invention consists in substituting for the grinding body at present
in use, as herein-before described, a common sand or grinding stone in saw-
grinding machines, in which the edge or periphery of the grinding body acts
directly upon the saw, secured to a table or bed plate.
Having now described the nature of our said Invention, and in what
manner the same is to be performed, we declare that we do not claim as our
Invention the machine or apparatus or parts thereof herein-before described
or referred to when taken separately, or otherwise than with a sand or grinding
stone used in conjunction; but what we claim as the Invention intended to be
secured to us by the above in part recited Letters Patent is, the use and
application of a common sand or grinding stone as part of and in connection
with the machine or apparatus, as above described, or any modification
thereof.
In witness whereof, we, the said John Wheatman and John Smith, have
hereunto set our hands and seals, this Fifth day of September, in the
year of our Lord One thousand eight hundred and fifty-seven.
Witness,
T. F. CASHIRE.
JOHN WHEATMAN. (L.S.)
JOHN SMITH.
(L.B.)