IMPROVEMENTS IN APPARATUS FOR SAWING CURVED DESIGNS
Year: 1865

page_text: LETTERS PATENT to Jabez Elverson, of Newark,, in the State of New
Jersey, United States of America, at present residing at Manchester,
in the County of Lancaster, Hat Manufacturer,. for the Invention of
"
Οι προπο Μπητη ποταπα
Sealed the 27th February 1866, and dated the 2nd September 1865..
PROVISIONAL SPECIFICATION left by the said Jabez Elverson at the
Office of the Commissioners of Patents, with his Petition, on the 2nd
September 1865.
I, JABEZ ELVERSON, of Newark, in the State of New Jersey, United States
of America, at present residing at Manchester, in the County of Lancaster,
Hat Manufacturer, do hereby déclare the nature of the said Invention for
"IMPROVEMENTS IN APPARATUS FOR SAWING CURVED DESIGNS," to be as follows:-
My Invention relates to a novel construction of apparatus in connection
with a vertical saw for sawing curved designs, whereby all slides and guides,
as hitherto employed, are dispensed with, and the feet are applied to.direct.
action upon the saw.

page_text: The improvements consist in the employment and use of a vibrating arm
and segmental quadrant, which is sufficiently weighted to produce a powerful
momentum when set in motion by the feet acting on treddles fixed to the
centre or fulcrum of the weighted vibrating quadrant; on the curved surface
of this quadrant a strap is attached and is connected to the lower end of a
fine saw; at this point also the end of a long lever is connected to the saw,
having its fulcrum some distance behind in the saw frame; a similar lever is
connected in like manner above or to the upper end of the saw; this lever,
near to its fulcrum, bears upon an india-rubber or elastic cushion which gives
the saw its required tension and also its upward stroke. The leather strap
attached to the 'saw and segmental quadrant passes between two fixed rollers;
the action of the machine being as follows: When the feet are placed upon
the treddles the motion of the weighted quadrant causes only a slight down-
ward motion of the saw until the strap strikes the rollers which retains the
upper portion of the strap in a perpendicular position; the slightest power
exerted will cause the quadrant to vibrate; the momentum of the weighted
quadrant when put in motion easily draws down the saw, the counter action
of which is obtained by the top lever and india-rubber cushion, the tension
and spring of which gives the up stroke to the saw and also a new momentum
to the weight to be used again in drawing down the saw. The strap to
which the saw is connected to the quadrant passing between the two fixed
rollers gives with each vibration of the pendulum two complete strokes to
the saw.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Jabez Elverson in the Great Seal Patent Office on the
2nd March 1866.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JABEZ
ELVERSON, of Newark, in the State of New Jersey, United States of America,
at present residing at Manchester, in the County of Lancaster, Hat-Manu-
.facturer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Second day of September,. in the year of our Lord
.One thousand eight hundred and sixty-five, in the twenty-ninth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said Jabez Elverson, Her special license that I; the said Jabez Elverson,
executors, administrators, and assigns, or such others as I, the said Jabez

page_text: Elverson, 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. APPARATUS: POR
SAWING CURVED DESIGNS," upon the condition (amongst others) that I, the said
Jabez Elverson, 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. i
.)
per
NOW KNOW YE, that I, the said Jabez Elverson, do hereby declaré
the nature of the said Invention, and in what manner the same is to be
formed, to be particularly described and ascertained in and by the following.
statement and accompanying Drawings (that is to say):-
My Invention relates to a novel construction of apparatus in connection
with a vertical saw for sawing curved designs, whereby all slides or guides, as
hitherto used, are dispensed with, and the feet are applied to direct action
upon the saw.
The improvements consist in the employment and use of a vibrating arm
and segmental quadrant, which is sufficiently weighted to produce a powerful
momentum when set in motion by the feet acting on treadles fixed to. the
centre or fulcrum-of- the weighted vibrating quadrant; on the curved surface
of this quadrant a strap is attached and is connected to the lower end of a
fine saw; at this point also the end of a long lever is connected to the saw,
having its fulcrum some distance behind in the saw frame; a similar lever is
connected in like manner above or to the upper end of. the saw; this lever,
near to its fulcrum, bears upon an india-rubber or elastic cushion which gives
the saw its required. tension and also its upward stroke. The leather strap
attached to the saw and segmental quadrant passes between two fixed rollers;
the action of the machine being as follows:-When the feet are placed upon
the treadles the motion of the weighted quadrant causes only a slight down-
ward motion of the saw until the strap strikes the rollers which retains the
upper portion of the strap in a perpendicular position; the slightest power.
exerted will cause the quadrant to vibrate; the momentum of the weighted
quadrant when put in motion easily draws down the saw, the counter action;
of which is obtained by the top lever and india-rubber cushion,. the tension
and spring of which gives the up stroke to the saw, and also new, momentum

page_text: The strap to
to the weight to be used again in drawing down the saw.
which the saw is connected to the quadrant passing between the two fixed.
rollers gives with each vibration of the pendulum two complete strokes to
the saw.
.
In order that the Invention may be better understood and explained in
detail I have hereunto attached a Sheet of Drawings made upon a scale of
about three inches to the foot, similar letters of reference being marked upon
corresponding parts of the apparatus.
Fig. 1 represents a side elevation of the improved vertical saw for sawing
curved designs having the front standard or frame removed in order to shew.
the peculiar construction of mechanism in connection with the vibrating
curved-headed lever which is employed to impart a rapid motion to the saw
during the operation of sawing; Fig. 2 represents a front elevation of the
same; and Fig. 3 represents the back framing of the machine in which the
fulcra of the levers are supported.
In Figs. 1 and 2, a, a, is the framing of the machine, to this framing the
bearings.b.are secured which support the vibrating arm and segmental qud-
rant or curved head c; this quadrant is sufficiently weighted to produce a
powerful momentum when set in motion by the feet acting on the treadles d.
The strap e is attached to the curved surface of the quadrant c, and also to the
lower end of the fine sawf; to the lower end of this saw the end of a long
lever g is also connected, the fulcrum of which is some distance behind at the
extremity of the saw frame; a similar lever h is connected in like manner
above to the upper end of the saw f; this lever, near to its fulcrum, bears
upon an india-rubber or elastic cushion i which gives the saw its acquired
tension and also its upward motion or stroke. The strape attached to the
saw and segmental quadrant passes between two fixed rollers k and 1, the
action of the machine when the feet give motion to the treadles & being as
follows:: The motion of the weighted quadrant causes only a slight downward
action to the saw until the strap e strikes the rollers k or 1, which have the
effect of retaining the upper portion of the strap e in a perpendicular position;
the slightest power exerted will cause the quadrant to vibrate, the momentum
of which, when in motion, easily draws down the same, the counter action of
which is obtained by the top lever h and india-rubber cushion i, the tension
and spring of which in drawing down the saw the strap e by which the saw
is connected to the quadrant c passing between the two fixed rollers k and l
gives with each vibration of the pendulum two complete strokes to the saw.
Having now described the nature of the said Invention, together with the
method of carrying the same into practical effect, I wish it to be distinctly

page_text: understood that I claim the novel construction, arrangement, and combination
of apparatus for effecting the desired purposes, as herein-before described, set
forth, and fully illustrated in the Drawings attached.
In witness whereof, I, the said Jabez Elverson, have hereunto set my
hand and seal, this Twenty-eighth day of February, in the year of
our Lord One thousand eight hundred and sixty-six.
J. ELVERSON. (L.S.)