A NEW OR IMPROVED MODE OF GIVING ROTATORY MOTION : TO A SHAFT OF A CIRCULAR SAW OR OTHER MUTANTLY CONN
Year: 1852

page_text: LETTERS PATENT to Robert Whipple Parker, of Roxbury, in the
State of Massachusetts and United States of America, for the In-
vention of A NEW OR IMPROVED MODE OF GIVING ROTATORY MOTION
:
TO A SHAFT OF A CIRCULAR SAW OR OTHER MUTANTLY CONN
Sealed the 5th January 1853, and dated the 1st October 1852.
PROVISIONAL SPECIFICATION left by the said Robert Whipple
Parker at the Office of the Commissioners of Patents, with his
Petition, on the 1st October 1852.
I, ROBERT W. PARKER, of Roxbury, in the State of Massachusetts
and United States of America, do hereby declare the nature of the said
Invention for "A NEW OR IMPROVED MODE OF GIVING ROTATORY MOTION
TO A SHAFT OF A CIRCULAR SAW OR OTHER MECHANICAL CONTRIVANCE" to he
as follows:-
This Invention consists of communicating rotatory motion from a
drum or wheel to an axis by means of an endless band or strap, part of
which is more or less pressed against the driving wheel or drum from
which the power is to be communicated.
The endless band passes partly round a pulley or drum on the axis to
be driven, and also partly around a drum or pulley on another axis,
which is capable of movement to and from the driving drum or wheel
to regulate the extent of pressure of the endless band on the driving
wheel or pully.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Robert Whipple Parker in the Great Seal Patent
Office on the 30th March 1853.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I,
ROBERT W. PARKER, of Roxburg, in the State of Massachusetts and
United States of America, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the First day of October, in the year of
our Lord One thousand eight hundred and fifty-two, in the sixteenth
year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said Robert W. Parker, Her special license
that I, the said Robert W. Parker, my executors, administrators, and
assigns, or such others as I, the said Robert W. Parker, my execu-
tors, administrators, and assigns, should at any time agree with, and
no others, from time to time and at all times 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 "A NEW OR IMPROVED MODE OF GIVING ROTA-
TORY MOTION TO A SHAFT OF A CIRCULAR SAW OR OTHER MECHANICAL CON-
TRIVANCE," upon the condition (amongst others) that I, the said Robert
W. Parker, by an instrument in writing under my hand and seal, should
particularly describe and ascertain the nature of the said Invention, and
in what manner the same was to be performed, and caused 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 I, the said Robert W. Parker, do hereby
declare that 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 thereof, that is to say:
Fig. 1, is a top or bird's eye view; Fig. 2, is a side elevation, with
the side of the case removed. Similar letters of referance indicating
the corresponding parts in each of the several Figures.
The nature of my Invention consists in driving circular saws or other
machinery by a peculiar arrangenient of a belt and pulleys, by which
the main driving pulley is made to pinch the band at the points in the

page_text: intermediate pulleys with any desired force. Much of the friction
attendant upon the ordinary mode of driving saws and other machinery
is dispenced with. The arrangement is more economical, as it is more
simple, and a greater effect with the same expenditure of power is
obtained.
To enable others skilled in the art to make and use my Invention, I
will proceed to describe its construction and operation.
A, A, represents a case in which the machinery is placed. B, is a
large wheel, so placed as to pinch the band EI, between the pulleys
E, and F. To the shaft b, is attached the crank O, by which the
wheel B, is turned, and motion given to the saw.
The shaft b, may
be hung upon friction rollers, if desired, and made adjustable, so that
the pulley B, can be made to press with any desired force against the
pulley E, and F, pinching the band at those points. D, is the saw
upon the shaft d, upon which is the pulley E. F, is a pulley hung
upon the frame G, through the lower ends of which the shaft b, of
the wheel B, passes; the frame G, being loose upon the shaft b. H,
is a belt passing round the pulleys E, F. See Fig. 2. I, is a rod,
the upper end of which is attached to the top part of the frame G, and
the lower end passes through a cross piece at the bottom of the case
A, A; a screw is cut upon the lower end of the rod I, on which the
nut J, works. The pulley F, can also be made adjustable in the frame
G, so as to press against the driving wheel B. with any desired force.
It will be seen that the saw D, is driven by the belt II, being in con-
tact with a portion of the periphery of the large wheel B; a greater or
less amount of friction is produced upon the wheel B, which presses
with any desired force against the pulleys E, and F, by tigtening the
belt H, by raising or lowering the frame G, by turning the nut J,
which works on the lower part of the rod I, and under the cross piece.
This will be seen by referring to Fig. 2. By this means only one
short belt is required to operate the saw, which in ordinary cases two
belts are required, and consequently more friction is created, and an
additional amount of power is required to overcome that friction.
By my arrangement I can easily get by hand power 2600 revolutions
of the saw pr minute, and am enabled to saw through 3 inch plank by
the power of one man at the crank.
4

page_text: Having thus described the nature and operation of my Invention,
what I claim as new, and desire to secure by Letters Patent, is,
Arranging the driving pulleys B, in refference to prilley E, and F.
that the band passing over these pulleys is not only pressed with any
desired force against the periphery of the driver B, but is also pinched
between the pulley B, E, and B, F, they operating upon the band as
feed rollers, substantially in the manner herein described.
In witness whereof, T, the said Robert W. Parker, have hereunto
set my hand and seal, this Fifteenth day of February, in the
year of our Lord Eighteen hundred and fifty-three.
Witness,
F. S. MYER.
JOHN F. PARKER.
ROBERT W. PARKER. (L.S.)
Witness,
ROBERT W. PARKER. (.s.)
F. S. MYER.
JOHN F. PARKER.
Taken and acknowledged before me,
Washington County, to wit.
I, John A. Smith, Clerk of the Circuit Court of the District of
Columbia for the County of Washington, hereby certify, that Franklin
S. Myer, Esq., before whom the aforegoing acknowledgment was
made, and who has thereto subscribed his name, was at the time thereof
a Justice of the Peace in and for the County and District aforesaid
duly commissioned and qualified.
In testimony whereof I have hereunto subscribed my name, and
affixed the seal of said Court, this 15th day of February 1853.

page_text: I. William Cranch, Chief Judge of the Circuit Court of the District
of Columbia, hereby certify that the above attestation of John A. Smith,
Clerk of the Circuit Court of the District of Columbia for the County
of Washington, is in due form.
To all to whom these Presents shall come, greeting.
I certify that W. Cranch, whose name is subscribed to the paper
hercunto annexed, is now, and was at the time of subscribing the
same, Chief Judge of the Circuit Court of the District of Columbia
duly commissioned, and that full faith and confidence are due to his
acts as such.
In testimony whereof, I, Edward Everett, Secretary of State of
the United States, have hereunto subscribed my name, and
(L.S.) caused the seal of the Department of State to be affixed.
Done at the City of Washington, this 15th day of February,
A.D. 1853, and of the Independence of the United States of
America the 77th.
I certify the signature on the other side to be that of the Honble
Edward Everett, Secretary of State of the United States.
(L.S.)
Washington, 16th Feb 1853,
PHILIP GRIFFITH,
Her Be M's Sec³ of Legation
to the United States of America.