AN IMPROVED METHOD OF CONVERTING CIRCULAR INTO RECIPROCATING MOTION
Year: 1868

page_text: LETTERS PATENT to William Tighe Hamilton, of Rathmines, Dublin,
for the Invention of "AN IMPROVED METHOD OF CONVERTING CIRCULAR
INTO RECIPROCATING MOTION."
Sealed the 15th January 1869, and dated the 22nd July 1868.
PROVISIONAL SPECIFICATION left by the said William Tighe Hamilton
at the Office of the Commissioners of Patents, with his Petition
on the 22nd July 1868.
I, WILLIAM TIGHE HAMILTON, of Rathmines, Dublin, do hereby
declare the nature of the said Invention for "AN IMPROVED METHOD OF
CONVERTING CIRCULAR INTO RECIPROCATING MOTION, to be as follows:-
A disk fixed at any desired angle to an axle is fitted into a rim;
this rim carries a pin which passes through a hole in a stud. The
stud is free to revolve on its own centre, so that the pin may move
backwards and forwards (sideways) or in and out, or turn in the hole.

page_text: The axle is so mounted as to be free to move in the direction of its
length or to rotate, and when it is compelled to rotate by another axle
connected with it by a feather or claw pins the inclination of the disk
as it works in the rim compels it to reciprocate. When reciprocation
without rotation is required the axle is only capable of rotating, while
the stud being left free it will reciprocate; or again the stud being
fixed and the axle free a second pin may be introduced into the opposite
side of the rim working in a similar stud to which it will impart double
the range of reciprocation as that of the axle. This reciprocator may also
be formed by a rim working in a groove on the outside of the disk,
or by a ring made to work on a boss against the face of the disk, a
plate keeping them together. The stud works either in a fixed bar or
other object; or in a bar or other object mounted in guides so as to
reciprocate.
This Invention is claimed as annlicable to all machines which require
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Tighe Hamilton in the Great Seal Patent
Office on the 20th January 1869.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
TIGHE HAMILTON, of Rathmines, Dublin, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-second day of July, in the year
of our Lord One thousand eight hundred and sixty-eight, in the thirty-
second year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said William Tighe Hamilton, Her special
licence that I, the said William Tighe Hamilton, my executors, admi-
nistrators, and assigns, or such others as I, the said William Tighe
Hamilton, 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

page_text: and Ireland, the Channel Islands, and Isle of Man, an Invention for
"AN IMPROVED METHOD OF CONVERTING CIRCULAR INTO RECIPROCATING MOTION,"
upon the condition (amongst others) that I, the said William Tighe
Hamilton, 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 William Tighe Hamilton, 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 following statement :-
The purpose of this Invention is to cause an axle or other object
to reciprocate whilst it rotates, or to reciprocate without rotation whilst
it moves in guides. Its principle is this, an axle is so mounted as
to be free to revolve and reciprocate in its bearings. A circular disc
is so mounted on this axle as to be inclined to it at any desired angle;
adjusting screws may be used for that purpose. This disc revolves
in a rim or ring in the nature of an eccentric strap. This strap carries
a round pin which works in a hole in a vertical stud which is so
mounted in the frame of the machine as to be free to revolve through
a small arc; the pin has thus a freedom for radial as well as for
twisting motion. The axle being made to rotate by any of the usual
means, such as a second axle provided with a claw or feather or sliding
gearing, is compelled by the inclination of the disc and the resistance
of the vertical stud and pin to reciprocate as it rotates. To obtain
reciprocation without rotation the axle is made merely to revolve, whilst
the object in which the vertical stud is mounted is left free to move
in guides. This object will then reciprocate without rotation; or the
vertical stud may remain fixed and the axle free, whilst a second pin
is introduced at the opposite side of the strap working in a second
vertical stud; the object in which this last is mounted will then
reciprocate. The construction of the reciprocator may be varied in
several ways the same in principle. The disc may be grooved and the
strap may work in the groove, or the strap may be made to work
against the side of the disc by means of a side plate or washer.

page_text: This Invention is applicable to all machines which require the con-
version of circular into reciprocating motion within certain limits.
In witness whereof, I, the said William Tighe Hamilton, have
hereunto set my hand and seal, this Nineteenth day of January,
in the year of our Lord One thousand eight hundred and sixty-
nine.
W. TIGHE HAMILTON. (L.S.)