IMPROVEMENTS IN MEANS FOR CONVERTING RECIPROCATING MOTION INTO ROTARY MOTION, AND VICE VERSA.
Year: 1873

page_text: LETTERS PATENT to George Finnegan, of Upper Abbey Street, in the
City of Dublin, Ireland, for the Invention of "IMPROVEMENTS IN MEANS
FOR CONVERTING RECIPROCATING MOTION INTO ROTARY MOTION, AND VICE VERSA.
"3.
Sealed the 1st July 1873, and dated the 12th May 1873.
PROVISIONAL SPECIFICATION left by the said George Finnegan at
the Office of the Commissioners of Patents, with his Petition, on
the 12th May 1873.
I, GEORGE FINNEGAN, of Upper Abbey Street, in the City of Dublin,
Ireland, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN MEANS FOR CONVERTING RECIPROCATING MOTION INTO ROTARY
MOTION, AND VICE VERSA," to be as follows:-
My Invention has for its object improvements in means for converting.
reciprocating motion into rotary motion, and vice versa. For this purpose.
instead of connecting a piston rod or othor reciprocating portion of
machinery by one link or connecting rod to a single crank pin or crank
as heretofore, I employ two connecting rods, each of which is attached
at one end to the end of the piston rod or reciprocating piece, whilst at
their other ends they are each connected to a separate crank or crank
pin mounted on or carried by two separate shafts or axes, which are
geared or otherwise connected together so that they shall rotate together

page_text: ´in contrary directions to each other. By these means in converting
reciprocating motion into rotary motion, and vice versa, I am enabled
to obtain an equilibrium of pressures on the end of the piston rod, or
other reciprocating piece, thereby obviating the necessity for employing
slides or other such guides to guide the outer end of the piston rod or
other reciprocating piece, and preventing any sideway thrust thereon.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said George Finnegan in the Great Seal Patent Office
on the 12th November 1873.
on the 12th November 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
FINNEGAN, of Upper Abbey Street, in the City of Dublin, Ireland, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twelfth day of May, in the year of our Lord
One thousand eight hundred and seventy-three, in the thirty-sixth year
of Her reign, did, for Herself, Her heirs and successors, give and grant
unto me, the said George Finnegan, Her special license that I, the
said George Finnegan, my executors, administrators, and assigns, or such
others as I, the said George Finnegan, 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 MEANS FOR CONVERTING
RECIPROCATING MOTION INTO ROTARY MOTION, AND VICE VERSA," upon the con-
dition (amongst others) that I, the said George Finnegan, my executors
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 immediately after the date
of the said Letters Patent.

page_text: or other such guides to guide the outer end of the piston rod or other
reciprocating piece, and preventing any sideway thrust thereon.
It is preferred to form the ends of the connecting rods d, as shown
more clearly at Figures 3 and 4, with sleeves or tubular bosses d³, which
are passed through a hole in the end of the piston rod or reciprocating
piece, and fit one within the other, and are connected to the piston rod b
by a pin f, but other means of forming the ends of the connecting rods
and of connecting them with the piston rod or reciprocating piece may
be employed.
It is evident that my Invention may also be applied to other
descriptions of machinery where it is required to convert reciprocating
into rotary motion, and vice versâ.
Having thus described the nature of my said Invention, and the mode:
in which I carry the same into effect, I would have it understood that
what I claim as my Invention is, the means, substantially as herein
described, of converting reciprocating into rotary motion, and vice versa,
by connecting the piston rod or other reciprocating piece to two cranks.
or crank pins by means of two connecting rods, instead of employing
only one crank or crank pin, and one connecting rod as heretofore.
In witness whereof, I, the said George Finnegan, have hereunto
set
my hand and seal, this Fourth day of November, in the year
of our Lord One thousand eight hundred and seventy-three.
Signed, sealed, and acknowledged
by the said George Finnegan,
at No. 35, Dawson Street,
Dublin, this Fourth
day of
Nov., 1873, in presence of
FRANCIS MORGAN,
Solicitor,
35, Dawson St.,
Dublin.
GEORGE FINNEGAN. (L.S.)