AN-IMPROVED LEVER AND SCREW PRESS
Year: 1872

page_text: LETTERS PATENT to George Haseltine, of the "International Patent
Office," Southampton Buildings, London, Doctor of Laws, for the
Invention of "AN-IMPROVED LEVER AND SCREW PRESS."-A com-
munication from abroad by George Bryant Boomer, of Syracuse,
NAW Vask Tinited States of America
COMPLETE SPECIFICATION filed by the said George Haseltine at
the Office of the Commissioners of Patents, with his Petition
and Declaration, on the 23rd November 1872, pursuant to the 9th
Section of the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
HASELTINE, of the "International Patent Office," Southampton Build-
ings, London, Doctor of Laws, send greeting.
WHEREAS I am in possession of an Invention for "AN IMPROVED LAVER
AND SCREW PRESS," and have petitioned Her Majesty to grant unto me,
my executors, administrators, and assigns, Her Royal Letters Patent
for the same, and have made solemn Declaration that it has been com-
municated to me from abroad by George Bryant Boomer, of Syracuse,
New York, United States of America.

page_text: NOW KNOW YE, that I, the said George Haseltine, do hereby
declare that the following Complete Specification, under my hand and
seal, fully describes and ascertains the nature of the said Invention, and
in what manner the same is to be performed, in and by the following
statement, reference being had to the accompanying Drawing forming a
part of this Specification :—
The great power of a combined lever and screw is well known, and
has been repeatedly embodied in a press, but owing to the liability of
the screw to move endwise and laterally and so get out of true working
line or to cause the nuts and arms to work untruly and the strain or
power of the press to get out of true line and be thrown laterally against
the frame of the press and damage the threads of the screw these devices
are now rarely used in presses.
This Invention is based on the discovery that the platen or follower
of a combined lever and screw press can be so braced and steadied
in the press frame that it cannot get out of its true working line, and
then by properly bracing and steadying the screw shaft in the platen
or follower or a permanent extension thereof the screw shaft will always
maintain its position, whilst its nuts and toggle levers will thus be free
from all liability to lateral thrust and consequent cramping or cutting of
the screw threads.
The said Invention consists in combining with a sliding standard or
standards supported and guided in the press frame so as to be void of
lateral movement a right and left or double screw shaft supported in
the sliding standard or standards, so as to be void of endwise motion, and
thus hold these co-operative parts in their true working position and
avoid all lateral thrust or strain.

page_text: A represents the base and B the head or top of the press; these two
parts are secured permanently and at a fixed distance from each other
by strong iron rods or bolts C, of which four are shewn in the Drawing.
Through or in the head B of the press there is an opening D having
guides a, a, a, a, Figure 2, therein, against which the standard É rigidly
attached to the platen or follower F moves and is guided and held from
any lateral play or motion. On the platen or follower F there are čast,
wrought, or otherwise rigidly fastened or arranged braces G one at each
corner, which braces move against and are guided by the columns, rods,
or bolts C, so that the platen or follower itself is firmly braced to keep
it in true vertical position below, whilst the standard or standards one
braced and guided above in the head of the press; and as the standard
is substantially a part and parcel of the follower it may be said that
the follower is rigidly braced at two points in, on, or against the press
frame.
To the head B of the press are pivoted as at 6 the upper ends of the
pair of levers H, I, their lower ends being hinged as at c to the nuts J, K,
respectively, and through these two nuts works the right and left or
double screw shaft L, as will be hereafter explained. To the lower end
or under side of the nuts J, K, are pivoted or hinged respectively as at d
the
upper ends of the under pair of levers M, N, the lower ends of which
are hinged as at e to the platen or follower F, thus forming toggle levers
to work in connection with the double screw shaft L and nuts J, K. It
will be perceived that in this improved press the platen or follower is
suspended from the head of the press by the toggle levers, and that the
screw shaft is sustained in and carried by said levers also, and moves up
and down when the press is worked, but with a differential movement
from that of the follower itself. And to admit of this differential
movement there is a vertical opening or slot O in the standard through
which the screw shaft L passes, and which admits of one moving inde-
pendently, of the other or through a greater range.
On or near the centre of the screw shaft there is rigidly and accurately
fixed a hub or wheel P, the ends of which as seen in Figure 3 are in
close contact with the standard E or the sides of a mortise Q therein,
so that the said shaft whilst it may move up and down in the
standard cannot move endwise, inasmuch as the standard as above
described is braced above and below to prevent its having any lateral
motion. By keeping the screw shaft thus permanently guided in the

page_text: standard, and the standard permanently guided in the press frame, the
toggle levers and the screw shaft act together in guided and true planes
without any end motion or tipping of the screw shaft without altering
the true distance of the nuts J, K, from the centre of the strain and
press and without skewing the platen or follower, and the result is that
very great power is attained without any injury to the threads of the
screw shaft or any lateral thrust upon the press frame:
Around the wheel or hub P upon the screw shaft there is arranged so
as to freely move a lever head f, into a socket of which is inserted a
lever R whereby the heavy pressure is attained. The perimeter of the
wheel P is formed into ratchet teeth as seen in Figure 4, and in the
lever head f there is pivoted a dog 9 which has a spring bolt i behind
it to hold it in and out of action, as the bolt only acts frictionally
against the dog. On one or both ends of the screw shaft Ļ a square
portion j may be made to receive a winch or crank S by which the
screw shaft may be more rapidly rotated than by the vibrating lever R,
and the follower raised or lowered more rapidly than by said lever,
but when a heavy strain is to be exerted the lever R, its dog, and
the ratchet wheel on the screw shaft are the devices by which that is
accomplished.
When the dog 9 is thrown and held out of action with the ratchet as
shown in Figure 4 the screw shaft can be rotated by the crank S.
When the lever R is to be used the dog g is moved in the direction
indicated by the arrows and then it acts in connection with the ratchet
and lever.
I have used the word standard as applied to the sliding guide E,
but there may be one, two, or more according to the size and capacity
of the press. The standard shown in the Drawing, though made of two
pieces for easily fitting the screw shaft L, ratchet and bracing wheel P,
dog g, and lever head to the press, is substantially one standard, the
two parts being bolted together and braced at the top, bottom, and
centre. The slots or openings O and Q through the standard are
necessary, the first for the screw shaft L to pass through and work in;
the second for receiving the hub or bracing wheel P on the screw shaft
and for the lever head and its appliances to work in.
The sliding
standard instead of being guided in the open space between the head
pieces B of the frame may be guided in or against the outer sides of
the head piece or pieces.

page_text: The screw shaft L of this press it will be perceived is not supported
directly in the press frame, but is carried by the toggle levers which are
pivoted or hinged to the said frame. It could not work in fixed bearings
because it must rise and fall with the platen or follower, but not to the
same extent.
Having thus fully described the said Invention, as communicated to
me by my foreign correspondent, and the manner of performing the
same, I wish it understood that I claim, in combination with the
sliding standard or standards supported and guided laterally in the press
frame the right and left or double screw shaft supported and braced -in
the sliding standards, substantially as and for the purpose described.
In witness whereof, I, the said George Haseltine, have hereunto
set my hand and seal, this Twenty-first day of November, in
the year of our Lord One thousand eight hundred and seventy-
two.
Witness,
W. J. LOWE.
GEORGE HASELTINE. (L.S.)