IMPROVEMENTS IN TOGGLE PRESSES
Year: 1879

page_text: LETTERS PATENT to Joseph Burn, of Springholme Terrace, Stockton-on-Tees,
in the County of Durham, for the Invention of "IMPROVEMENTS IN TOGGLE
PRESSES"
PROVISIONAL SPECIFICATION left by the said Joseph Burn at the Office of
the Commissioners of Patents on the 17th January 1879.
JOSEPH BURN, of Springholme Terrace, Stockton-on-Tees, in the County of
Durham. "IMPROVEMENTS IN TOGGLE PRESSES."
This Invention has for its object improvements in toggle presses.
In presses of this class the pressure is applied by the straightening of jointed
links interposed between the presshead and the follower. I employ two pair of
jointed or toggle links, and these at their upper or outer ends abutt upon the press
head, and at their other ends they abutt upon the follower of the press. The ends
of the links are connected both to the press head and the follower by knuckle
joints. The intermediate joints of the toggles, by the straightening of which the
action is obtained, are carried upon and controlled by a transverse guide bar, which
itself is able to move along guides to and from the press head. The toggles are
actuated in the following manner:-The upper length of each toggle link, or that
which abutts upon the press head, has a toothed are formed or fixed upon it, and
this are gears with a pinion upon a shaft which receives a slow motion from the
motor by means of a worm and worm wheel or in other convenient manner.
two arcs may either gear with separate pinions upon parallel axes geared together
or it may be with two pinions of different sizes on the same axis, the one are having
internal teeth gearing on the under side of the pinion, whilst the other arc has
external teeth and gears on the upper side of its pinion. The axis or axes of the
pinions may either be between the press head and the follower or above or beyond
the head of the press.
The
In some cases I dispense with the sectors and substitute straight toothed racks,
connected by joints with the toggle links and gearing with a pinion or pinions upon
the shaft or shafts, which take movement from the motor.

page_text: In this case the toothed pinions C, C, are of different diameters, and are fixed
upon one and the same shaft E.
These pinions gear into toothed arcs A, A, formed or fixed upon the toggle
links B, B. The toothed arcs are of different radii and made proportionate to the
different diameters of the pinions, the larger are having internal and the smaller
are having external teeth.
When motion is given to the shaft E the two toothed pinions are caused to
revolve in the direction of the arrow, thus actuating the toothed arcs in a uniform
manner and causing the toggle links or arms of the press to straighten themselves.
Figure 7 represents a side view, Figure 8 an end view, and Figure a plan of a
toggle press with another arrangement according to my Invention.
A, A, are toothed racks connected by joints with the toggle links B, B; C, C,
are toothed pinions fixed upon the shafts D, E, and gearing with toothed racks A, A.
C, C, are toothed pinions of equal diameter gearing with each other.
When motion is given to the shaft E the two toothed pinions C, C, are caused to
revolve in opposite directions, as shown by the arrows, thus actuating the toothed
racks A, A, in a uniform manner and causing the toggle links of the press to
straighten themselves.
In each case the axes or axis of the pinions may either be between the press
head and the follower or above and beyond the head of the press; also the pro-
portions and form of the gearing between the pinion shafts and the prime mover
may be varied as desired for different speedings, and the presses may be provided
with driving and reversing gear of any known kind; also the jointed arms or links
may either he directly connected with each other or they may be connected to an
intermediate socket carried and controlled by a guide bar, which itself is able to
move along guides to and from the press head.
Having thus described the nature of my Invention and in what manner the same
is to be performed I claim as my improvements in toggle presses,―
First. Working the toggle arms by means of toothed arcs actuated by toothed
pinions fixed upon two shafts or axes placed parallel with each other, substantially
as herein described with reference to Figures 1, 2, and 3 of the accompanying
Drawings.
Second. Working the toggle arms by means of toothed arcs actuated by toothed
pinions fixed upon one and and the same shaft or axes, substantially as herein
described with reference to Figures 4, 5, and 6 of the accompanying Drawings.
Third. Working the toggle arms by means of toothed arcs actuated by toothed
pinions fixed upon two shafts or axes placed parallel with each other, substantially
as herein described with reference to Figures 7, 8, and 9.
Fourth. The construction of toggle presses substantially as described and repre-
sented in the annexed Drawings.
In witness whereof, I, the said Joseph Burn, have hereunto set my hand and
seal, this Fifteenth day of July, in the year of our Lord One thousand
JOSEPH BURN. (L.S.)