IMPROVE- MENTS IN THE MEANS OF CHANGING A ROTARY INTO A RECIPROCATING AND A RECIPROCATING INTO A ROTARY MOVEMENT IN MACHINERY
Year: 1862

page_text: LETTERS PATENT to David Monroe Childs, of No. 481, New Oxford Street,
in the County of Middlesex, Engineer, for the Invention of "IMPROVE-
MENTS IN THE MEANS OF CHANGING A ROTARY INTO A RECIPROCATING AND A
RECIPROCATING INTO A ROTARY MOVEMENT IN MACHINERY."-A communication
from abroad by James Mills Ray, John Hooper Redstone, and Albert
Ellis Redstone, of Indianapolis, in the State of Indiana, one of the Unitéd
States of America.
Sealed the 24th October 1862, and dated the 29th April 1862.
PROVISIONAL SPECIFICATION left by the said David Monroe Childs
at the Office of the Commissioners of Patents, with his Petition, on
the 29th April 1862.
I, DAVID MONROE CHILDS, of No. 481, New Oxford Street, in the County
of Middlesex, Engineer, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN THE MEANS OF CHANGING A ROTARY INTO A RECIPROCATING
AND A RECIPROCATING INTO A ROTARY MOVEMENT IN MACHINERY," to be as
follows:-
There is a slot in the device or frame as long as the stroke or motion
required, and through which the shaft is designed to travel or pass, and there
are grooves crossing the centre of the slot at right, angles with the same. The
groove is designed to receive a slide which operates upon a crank wrist.
I mention by way of illustration, that when it is intended to use my arrange-
ments for the purpose of pumping I have a shaft passing through the slot and

page_text: a crank arm attached to the waist of the slide which is made to operate in the
groove as the shaft is revolved, crossing the slot at the end of each stroke of
the pump rod. When the common crank cam or crank axle are used, guides
are necessary, which confine to an arbitrary line or give a rocking motion.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said David Monroe Childs in the Great Seal Patent Office
on the 29th October 1862.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, DAVID
MONROE CHILDS, of No. 481, New Oxford Street, in the County of Middlesex,
Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-ninth day of April, in the year of our Lord One
thousand eight hundred and sixty-two, in the twenty-sixth year of Her 'reign,
did, for Herself, Her heirs and successors, give and grant unto me, the said
Davie Monroe Childs, Her special licence that I, the said David Monroe
Childs, my executors, administrators, and assigns, or such others as I, the said
David Monroe Childs, 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 THE MEANS OF CHANGING A ROTARY INTO A RECIPROCATING AND A
RECIPROCATING INTO A ROTARY MOVEMENT IN MACHINERY," a communication to
me from abroad by James Mills Ray, John Hooper Redstone, and Albert Ellis
Redstone, of Indianapolis, in the State of Indiana, one of the United States
of America, upon the condition (amongst others) that I, the said David
Monroe Childs, 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.
NOW KNOW YE, that I, the said David Monroe Childs, do hereby
declare 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
ollowing statement :-

page_text: There is a slot in the device or frame as long as the stroke or motion
required and through which the shaft is designed to travel or pass, and there
are grooves crossing the centre of slot at right angles with the same.. The
groove is designed to receive a slide which operates upon a crank wrist. I
mention by way of illustration that when it is intended to use my arrange-
ments for the purpose of pumping, I have a shaft passing through the slot and
a crank arm attached to the wrist of the slide, which is made to operate in
the groove as the shaft is revolved, crossing the slot at the end of each stroke
of the pump rod. When the common crauk cam or crank axle are used
guides are necessary, which confine to an arbitrary line or give a rocking
motion.
In order that my Invention be better understood I will proceed to describe
it in conjunction with the three views in the accompanying Sheet of Drawings,
wherein Fig. 1 is a front view of the mechanism; Fig. 2, a lateral sectional
elevation of same; and Fig. 3, an example of its application to working
a saw.
Figures 1 and 2 serve to illustrate the conversion of rectilinear alternating
motion into continuous rotary motion. a is the propelling rod working with a
to-and-fro motion, and provided at one of its extremities with the cross piece b,
which has an open slot c in continuation of the axis of the rod, and which is
also fitted with a double groove d, d, placed at right angles with the slot; e is
the shaft which receives a continuous rotary motion by means of the cross,
and for this purpose the said shaft is provided with a crank f, the outer eye g
of which is fitted on the stud h attached to the slide or bar i; in this position,
as the propelling rod a travels in the direction of the arrow, it will cause the
crank to describe a circle in the direction of the curved arrow, and when the
said crank assumes a position at right angles with the cross, the intersection
of the slot c, and of the grooves d, d, will occur at the centre of the shaft, and
when the cross arrives at the extremity of its stroke the crank will present
itself on the same axis as the slot, with its slide bar i straddling across the slot
on its passage from one slide to the other. In order to diminish the friction
of the cross on the rotating shaft, I provide the latter at the place of their
intersection with a loose ring k (see Fig. 2); to this loose ring I in some
cases substitute a rod fixed to the extremity of the cross, and which travels
backwards and forwards in a fixed guide; m, m, are two adjustable pieces
forming one side of the grooves, and which can be set forward in order to
compensate for wear.
In order to illustrate the application of my new motion to mechanical
purposes. I have represented in Fig. 3 an alternating saw actuated by the said

page_text: mechanism; in this case the rotary motion of the driving shaft
imparts a
to-and-fro motion to the cross b, as will be easily understood by referring to the
Figs. 1 and 2; and for greater simplicity in such a case I do away with the
crank by entering the stud of the slide in one of the arms of the driving pulley
or the fly wheel as the case may be.
I do not claim any of the parts taken separately, but I claim as my
Invention the combination and arrangements as herein-before described.
In witness whereof, I, the said David Monroe Childs, have hereunto
set my hand and seal, this Twenty-ninth day of October, in the
year of our Lord One thousand eight hundred and sixty-two.
D. M. CHILDS. (L.S.)