IMPROVEMENTS IN MACHINERY FOR SAWING WOOD AND STONE, PART OF WHICH IS APPLICABLE ALSO TO OTHER MACHINES IN WHICH CRANKS ARE USED
Year: 1869

page_text: LETTERS PATENT to George Finnegan, of Dublin, Ireland, Timber
Merchant, for the Invention of "IMPROVEMENTS IN MACHINERY FOR
SAWING WOOD AND STONE, PART OF WHICH IS APPLICABLE ALSO TO OTHER
MACHINES IN WHICH CRANKS ARE USED."
Sealed the 18th January 1870, and dated the 20th July 1869.
PROVISIONAL SPECIFICATION left by the said George Finnegan at the
Office of the Commissioners of Patents, with his Petition, on the
20th July 1869.
IN
I, GEORGE FINNEGAN, of Dublin, Ireland, Timber Merchant, do
hereby declare the nature of the said Invention for "IMPROVEMENTS
MACHINERY FOR SAWING WOOD AND STONE, PART OF WHICH IS APPLICABLE ALSO
TO OTHER MACHINES IN WHICH CRANKS ARE USEг," to be as follows:-
My Invention refers, firstly, to machines such as are called log and
deal frames, and in adapting my said Invention thereto I propose to
give motion to the frame by a lever vibrating on a centre and provided
with a parallel motion. The end of this lever has a slot, within which
ונ..

page_text: is the bearing for carrying the crank pin which drives the saw frame.
This bearing is in contact on each side with a series of rollers mounted
in the said lever, or in a box carried thereby, and they abut at each
end against springs, or in some cases I dispense with the said springs.
In order to set the rollers when required to the face of the bearing I
adapt wedges or similar apparatus acting against the box. Instead of
the vibrating lever a simple connecting rod may carry the aforesaid
rollers. Also I propose to use similar but fixed boxes and rollers and
springs to act as guides for the sides and back of the saw frame, and to
connect a saw frame to each end of the aforesaid vibrating lever, whereby
they become balanced. The arrangement of crank above described I
employ in other machines in which cranks are used.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said George Finnegan in the Great Seal Patent Office
on the 20th January 1870.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
FINNEGAN, of Dublin, Ireland, Timber Merchant, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twentieth day of July, in the year of
our Lord One thousand eight hundred and sixty-nine, in the thirty-
third year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said George Finnegan, Her special licence
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 MACHINERY
FOR SAWING WOOD AND STONE, PART OF WHICH IS APPLICABLE ALSO TO OTHER
MACHINES IN WHICH CRANKS ARE USED," upon the condition (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

page_text: 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 George Finnegan, do hereby declare
the nature of the 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-
My Invention refers, firstly, to machines such as are called log and
deal frames, and in adapting my said Invention thereto I propose to
give motion to the frame by a lever vibrating on a centre and provided
with a parallel motion. One end of this lever has a slot, within. which is
the bearing for carrying the crank pin which drives the .saw frame.
This bearing is in contact on each side with a series of rollers mounted
in the said lever or in a box carried thereby, and they abut at each end
against springs, or in some cases I dispense with the said springs. In
order to set the rollers when required to the face of the bearing I adapt
wedges or similar apparatus acting against the boxes. Instead of the
vibrating lever a simple connecting rod may carry the aforesaid rollers.
Also I propose to use similar but fixed boxes and rollers and springs to
act as guides for the sides and back of the saw frame, and to connect a
saw frame to each end of the aforesaid vibrating lever, whereby they
become balanced. The arrangement of crank above described I employ
in other machines in which cranks are used.
And in order that my Invention may be more clearly understood and
readily carried into effect, I will proceed, aided by the accompanying
Drawings, more fully to describe the same.
DESCRIPTION OF THE DRAWINGS,
in the various Figures of which similar parts are marked with similar
letters of reference.
my
Invention
may
be
Figure 1 is a front view of parts shewing how
applied to a log or deal frame. a is a vibrating lever, which is mounted
evin hand is provided with parallel motions consisting of levers
in the various Figures of which similar parts are marked with similar
letters of reference.
Figure 1 is a front view of parts shewing how my Invention may be
applied to a log or deal frame. a is a vibrating lever, which is mounted
on an axis band is provided with parallel motions consisting of levers
c, c, and links d, d, as shewn, the levers c, c, being each connected at c¹
to the lever a and to a saw frame by a connecting rod e. One end of
the lever a is enlarged, as shewn, and has a slot a¹ formed therein to

page_text: receive the bearing or slide f for carrying the crank pin g which gives
motion to the saw frame. This bearing or slide f is, as shewn at
Figures 6 and 7, in contact on each side with a series of rollers h, h, h,
mounted on the said lever, or, as I prefer, in a box or frame i carried
thereby. As the bearing or slide f in the motion of the crank pin g
around its axis g' travels to and fro in the slot or opening a¹, the series
of rollers h, h, h, will be caused by the action of the bearing or slide f
to roll upon the interior surfaces of the slot or opening a', and in order to
prevent slippage, and that they may always be controlled to travel the
same distance, I mount on the axis of one of the rollers h (the centre one)
a toothed pinion h', which on one side is taken into by the toothed rack f¹
fixed to the slide or bearing f, and on the other side takes into a toothed
rack a³ fixed to the lever a. Springs a³, a³, are fixed at each end of the
slot or opening a¹ to moderate the momentum of the boxes in which the
rollers act or revolve as they arrive at each end of the slot or opening a¹.
In order to set the rollers h, h, h, when required to the face of the
bearing or slide f, I employ wedges j, j, which are capable of being
moved to and fro by screws k, k, as shewn, or by other suitable means.
Figure 2 is a front view view, and Figure 3 is a plan of a modification of
my Invention as applied to log and deal frames for driving the saw frames
thereof. In this arrangement instead of employing a vibrating lever a,
as in Figure 1, I employ a pair of connecting rods or links a* provided
with slots or openings a¹ in one end thereof, in each of which works a
slide or bearing f for the cranks g, the slots or openings a¹ in this
arrangement being also provided with friction rollers h, h, h, and other
parts, as described with respect to Figure 1, and shewn at Figures 6
and 7. The levers or connecting rods a*, a*, are each provided with a
parallel motion, as described with respect to Figure 1, to give motion
to the saw frames, some of the parts of which are according to this
arrangement placed in different positions, as will be readily understood
by reference to the Drawings.
Figure 4 is a side view, and Figure 5 is a sectional plan of one side
of a saw frame showing the mode in which I propose to reduce the
friction of the saw frame in working. This I effect by the employment
of two sets of rollers 1, 1, 1, and m, m, m, working in contact with the
back and outer edges of each side of a saw frame, which causes the
rollers to roll to and fro in the saw frame guide. These two sets of

page_text: rollers are connected together by suitable frames n, n, and work in
fixed boxes o, o, which act as guides and protect them from dust and
dirt. On the axis of the centre roller I fix a toothed pinion p, which
is taken into on one side by the toothed rack q fixed to the saw frame,
and on the other side takes into a toothed rack r fixed to the saw frame
guides, so as to prevent slippage and to control the motion of the
rollers and m, and thereby cause them to work always to the same
points. Wedges u operated by screws are employed to facilitate
adjustment of the rollers 1, 1, and m, m, as wear takes place, and springs
w are employed to check the momentum of the frame carrying the
rollers 1, 1, and m, m, whilst a spring x acts to support the weight of
the frames n, n, and prevent their hanging on the axes of the rollers
1, l, m, m, and thereby causing undue friction.
Figure 6 is a front view, and Figure 7 is a sectional side view shewing
my Invention applied to a vertical engine, and Figure 8 shews my
Invention applied to a horizontal engine, the nature of which with the
description already given will be clearly understood.
I would here observe that in some cases the arrangements of cranks
for driving various machinery may be placed at right angles to the
positions shewn in the Drawings, and although in adapting my Inven-
tion to sawing machinery I prefer to employ two saw frames as described,
my Invention may also be applied to driving only a single saw frame, as
will be readily understood.
I would also remark that the shape and proportions of the various
parts may be modified without departing from the nature of iny Inven-
tion, whilst the slot or opening. a' may, if desired, be formed at a point
intermediate of the point at which the levers a, a, are pin jointed to
their supports and the point where they are connected to the levers c.
Having thus described the nature of my said Invention, and the
mode in which I propose to carry the same into effect, I would have
it understood that what I claim is,-
First. The combined arrangements, substantially as herein shewn
and described, for converting rotary motion into reciprocating motion, or
vice versa, to be employed in communicating motion to sawing and
other machinery.

page_text: And, secondly. I claim the combined arrangement, substantially as
herein shewn and described, for relieving the sides and backs of saw
frames from undue friction.
In witness whereof, I, the said George Finnegan, have hereunto
set my hand and seal, this Seventeenth day of January, in the
year of our Lord One thousand eight hundred and seventy.
GEORGE FINNEGAN. (L.S.)
Signed, sealed, and acknowledged by the
said George Finnegan, in presence of
FRANCIS MERZAN,
Sol**.,
No. 35, Dawson Street,
Dublin,
17 Jan. 1870.