IMPROVEMENTS IN MACHINERY FOR DRIVING GRINDSTONES AND GLAZERS
Year: 1858

page_text: LETTERS PATENT to James Bailey, Edward Oldfield, and Samuel Oddy, all
of Salford, in the County of Lancaster, Machine Makers, for the Inven-
tion of "IMPROVEMENTS IN MACHINERY FOR DRIVING GRINDSTONES AND
GLAZERS."
PROVISIONAL SPECIFICATION left by the said James Bailey, Edward
Oldfield, and Samuel Oddy at the Office of the Commissioners of
Patents, with their Petition, on the 12th April 1858.
We, JAMES BAILEY, EDWARD OLDFIELD, and SAMUEL ODDY, all of Salford, in
the County of Lancaster, Machine Makers, do hereby declare the nature of
the said Invention for "IMPROVEMENTS IN MACHINERY FOR DRIVING GRINDSTONES
AND GLAZERS," to be as follows:-
The nature of our Invention consists in driving grindstones and-glazers, by
a friction plate fixed on a driving shaft, which friction plate gives motion to a
friction pulley fixed on a shaft in communication with the grindstone or glazer
to be driven. The friction. pulley is capable of being moved laterally on the
shaft so as to be able to vary the velocity of the grindstone according to its
diameter; the end of the shaft of the friction pulley is supported in a sliding
bearing for the purpose of drawing the friction pulley out of contact with the
friction plate. The lever by which the sliding bearing is moved is furnished

page_text: with a pall, taking in a segment ratchet to retain the friction pulley in or out
of contact with the plate. The same friction plate may be used to drive either
one, two, three, or four grindstones or glazers.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said James Bailey, Edward Oldfield, and Samuel Oddy in the
Great Seal Patent Office on the 11th October 1858.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, JAMES
BAILEY, EDWARD OLDFIELD, and SAMUEL ODDY, all of Salford, in the County of
Lancaster, Machine Makers, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twelfth day of April, in the year of our Lord
One thousand eight hundred and fifty-eight, in the twenty-first year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto us, the
said James Bailey, Edward Oldfield, and Samuel Oddy, Her special licence
that we, the said James Bailey, Edward Oldfield, and Samuel Oddy, our
executors, administrators, and assigns, or such others as we, the said James
Bailey, Edward Oldfield, and Samuel Oddy, 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 Inven-
tion for "IMPROVEMENTS IN MACHINERY FOR DRIVING GRINDSTONES AND GLAZERS,"
upon the condition (amongst others) that we, the said James Bailey, Edward
Oldfield, and Samuel Oddy, our executors or administrators, by an instrument
in writing under our, or their, or one of our or 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.
19
NOW KNOW YE, that we, the said James Bailey, Edward Oldfield, and
Samuel Oddy, 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 nature of our Invention consists in driving grindstones and glazers by a
friction plate fixed on a driving shaft, which friction plate gives motion to a
riction pulley fixed on a shaft in communication with the grindstone or glaze

page_text: to be driven. The friction pulley is capable of being moved laterally on the shaft,
so as to be able to vary the velocity of the grindstone according to its diameter.
The end of the shaft of the friction pulley is supported in a sliding bearing,
for the purpose of drawing the friction pulley out of contact with the friction
plate; the lever by which the sliding bearing is moved is furnished with a
pall taking in a segment ratchet to retain the friction pulley in or out of con-
tact with the plate. The same friction plate may be used to drive either one,
two, three, or four grindstones or glazers.
And in order that our Invention may be fully understood, and readily
carried into effect, we will proceed to describe the means pursued by us,
reference being had to the accompanying Sheet of Drawings, and to the
figures and letters marked thereon.
b
Fig. 1 is an end elevation of our improved driving apparatus; Fig. 2 is a plan
view; and Fig. 3, a detached view of part of the same; Fig. 4 is a plan shewing
how four grindstones may be driven by one friction plate or drum. a is the
main shaft which is driven by steam or other power, to this shaft is fixed the
friction plate b, which gives motion to the friction pulley c connected to the
shaft d by a key and groove; at the other end of the shaft d is fixed the
bevel wheel e, gearing into the wheel f, keyed on the shaft g of the grindstone h,
or of a glazer. The lower end of the shaft & revolves in the sliding bearing i,
seen best in Fig. 3; this bearing may be moved so as to bring the friction
pulley c out of contact with the plate 6 by the lever j, to which is jointed one
end of the link k, the other end of which is connected to the sliding bearing i.
To the lever j is hinged the pall 7, taking in the segment ratchet m, by means
of which the friction pulley is held either in or out of contact with the friction
plate. A tail pin n may be applied to adjust the position of the shaft a, as
shewn in Fig. 2. When the grindstone becomes worn, or is otherwise
reduced in diameter, it is evident that the velocity on its circumference is also
reduced, and in order to regain the proper velocity at the circumference, it is
necessary to increase the rotary velocity; this is effected in a very short time
by moving the friction pulley c further from the axis of the drixing shaft a,
whereas in the usual mode of driving grindstones by pulleys and straps it
was necessary to change the pulley on the driving shaft, or on the grindstone
shaft, and then to lengthen or shorten the strap to suit the pulleys. Another
great advantage resulting from this improved mode of driving grindstones is
the facility with which any stone can be stopped. The attendant by moving
the lever from the position in which it is shewn in full lines in Fig. 3, to
that indicated by the dotted lines, draws the friction pulley c out of contact
with the friction plate b.

page_text: The Plan Fig. 4 represents a friction drum b', imparting motion to the
four friction pulleys c, c, c, c. It is evident that two grindstones or glazers
may be driven by one friction plate 6, or that three may be driven by a drum
like b', and that our Invention may be modified by fixing the friction plate to
the shaft of the grindstone or glazer, and by placing the friction pulley near
the upper end of the shaft d.
Having thus stated the nature of our Invention, and described the manner of
performing the same, we wish it to be understood that we do not limit ourselves
to the details set forth, so long as the peculiar character of our Invention is
retained; and we declare that we claim, driving grindstones and glazers by
friction plates and friction pulleys, as described.
In witness whereof, we, the said James Bailey, Edward Oldfield, and
Samuel Oddy, have hereunto set our hands and seals; this Ninth
day of October, in the year of our Lord One thousand eight hundred
and fifty-eight.
JAMES BAILEY. (L.S.)
EDW. OLDFIELD. (L.S.)
SAM. ODDY.
(L.S.)
JAMES BAILEY. (L.S.)
EDW. OLDFIELD. (L.S.)
SAM. ODDY.
(LS.)