Improvements in Power Presses.
Year: 1892

page_text: Date of Application, 7th Dec., 1892
Complete Specification Left. 15th Sept., 1893-Accepted, 18th Nov., 1893
PROVISIONAL SPECIFICATION.
Improvements in Power Presses.
We, TAYLOR AND CHALLEN LIMITED and STEPHEN WILLIAM CHALLEN,
of Derwent Foundry, Constitution Hill, in the City of Birmingham, Engineers,
do hereby declare the nature of this invention to be as follows:--
This invention relates to the manner in which we construct and arrange power
presses used for drawing, stamping, punching or forming articles from sheet metal,
or like purposes, whereby we are enabled to expedite the delivery of the articles
from the press and at the same time to facilitate the method of stopping and starting
and controlling the press.
In carrying our invention into effect when constructing a press or machine for
forming articles from sheet metal we construct the frame work of the press in any
usual ordinary manner, mounting and arranging brackets or bearings thereon to suit
our special requirements.
Between the frames we carry an overhead crank shaft which we drive by gearing
connected in any ordinary manner to the main pulley driving shaft. Upon this
crank shaft we arrange a pair of cams for working against the improved form of
levers which we arrange upon the press for operating the blank holder.
We mount a system of toggle levers between the frames or sides of the press and
we form these levers with tails or free ends for the purpose of enabling them to be
opened or closed by the cams on the crank shaft. We connect these jointed or
toggle levers to the blank holder slide or slides at the one end, and at the other to
a weigh shaft or fulcrum shaft carried between the frames, so that when the tails or
free end of the toggle levers are raised by the cams, the toggles are closed together
to form a straight or direct line of thrust on to the blank holder and thereby carried
down on to the metal sheet upon the die plate. We arrange the cams in such a
position on the crank shaft that the crank, which we connect direct by a connecting
rod or rods to the punch or former slide, may be a suitable distance behind the
blank holder slide moving downwards, or we arrange the toggle levers in such a
manner that when acted on by the cams they will carry down the blank holder in
advance of the force or punch slide thereby permitting the blank to be held down
upon the bolster plate or die plate of the press while the punch or force is drawing
or forcing the metal into the die to form the dish or other article.
The return or up stroke of the force or punch slide we cause to start the opening
movement of the toggle levers by means of a thrust lever or levers which we
connect to the slide in such a manner that a tooth or series of teeth or horn like
projections formed on or attached to the distance pieces of the toggle joints may
be engaged by the lever or levers so as to force the toggles open and thus to raise
the blank holder slides to which they are attached.
We sometimes dispense with these opening levers by mounting rack shaped levers
on the slide of the punch which we cause to engage with teeth or horns on the
toggle joint pieces or upon pinion like discs mounted on the joint shaft. We prefer
to employ balance weights to balance slides and blank holder and we carry these
weights or levers overhead or we arrange them below with rods to transmit their
pull or thrust to the slides; these weights assist the upward motion of the blank
holder and at the same time relieve the crank shaft of their weight upon the cams.
We provide adjustable stops and links so that we may regulate the position of
the blank holder to suit the thickness of metal which is to be operated upon; and
we employ any ordinary form of ejecting or extracting plates and levers for
delivering the articles from the dies or bolster.
The toggle levers we connect together with a distance piece formed upon them,

page_text: or we make them separately and place a loose distance piece between them on their
shafts.
We employ any form of clutch motion to disengage the gearing when it is
desired to stop and start the crank shaft at the termination of its upward stroke,
but we arrange with special advantage a clutch having a jaw or a series of jaws
which we bring together to engage with an annular or other projection or annular
projections carried on a disc or other driven or driving member of the press gearing.
We form this improved clutch with its tong like jaws arranged so that a lever,
which is liberated by means of a horn being struck by a moving rod worked from
the crank shaft, may cause a cone or series of cones or rollers to be drawn outwards
to bring the lever ends of the jaws together and thus to cause the opposite ends of
these jaws to release or cease to clip the projection from the pinion plate or other
disc.
We employ any number of these nipping jaws to engage with a like number of
projections to suit any particular requirement in which much friction is to be
produced by a light weighed lever or by a slight pressure from the hand. We
prefer to line our nipping jaws with wood or other suitable blocks to permit of
increased friction to be produced and to enable adjustments for wear and tear to be
readily made. We place springs behind the nipping jaws in suitable positions, for
enabling ready withdrawal to be ensured when the pressure on the slide or sleeve
is removed.
We prefer to arrange our clutch levers so that when the clutch is released a
pressure is applied to a brake lever to cause a block to be thrust against a brake.
pulley or brake wheel, which we mount upon the clutch spindle shaft or in any
other convenient position. Instead of arranging a thrust block we sometimes cause
an ordinary brake band or strap to be tightened by the movement of the lever.
We modify the form of our press and the arrangement of levers, gearing and
parts to suit any particular requirement maintaining throughout the same essential
features of a quick return motion for the blank holder, and a tenacious grip from
the clutch as hereinbefore described.
Dated this 5th day of December 1892.
MARKS & CLERK,
13, Temple Street, Birmingham, Agents for the Applicants.
COMPLETE_ST’ECIFICATION.
Improvements in Power Presses.
We, TAYLOR AND CHALLEN LIMITED, and STEPHEN WILLIAM CHALLEN
both of Derwent Foundry, Constitution Hill, in the City of Birmingham,
Manufacturers, do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
This invention relates to the manner in which we construct and arrange power
presses used for drawing, stamping, punching or forming articles from sheet metal
or for like purposes, whereby we are enabled to expedite the delivery of the articles
from the press and at the same time to facilitate the method of stopping and
starting and controlling the press.
In the four accompanying sheets of explanatory drawings-
Figure 1 is a front elevation of our improved machine.
Figure 2 is a side elevation and Figure 3 a sectional plan of the same.
Figure 4 is a detailed front elevation of one of our upper levers, Figure 5 is a
side elevation, and Figure 6 a plan of the same.
Figure 7 is a detailed sectional elevation of one form of our improved clutch.
Figure 8 is an elevation of one of the clutch grippers, Figure 9 a plan, and
Figure 10 an end elevation of the jaw portions of the same.
In carrying our invention into effect when constructing a press or machine shown

page_text: at Figures 1, 2 and 3 for forming articles from sheet metal we construct the frame-
work A A of the press in any usual ordinary manner, mounting and arranging
brackets or bearings such as B C thereon to suit our special requirements.
Between the frames A A we carry an overhead crank shaft D which we drive by
gearing E E E E³ e²e connected in any ordinary manner to the main pulley
driving shaft F. Upon the crank shaft D we arrange a pair of cams GG¹ for
working, against the improved form of levers H H¹ which we arrange upon the
press for operating the blank holder K.
We mount a system of toggle levers H H JJ' between the frames or sides of
the press and we form the upper levers H H¹ with tails or free ends hh' for the
purpose of enabling them to be opened or closed by the cams G G on the crank
shaft. We connect these jointed or toggle levers H H J J to the blank holder
slide or slides L L' at the one end, and at the other to a weigh shaft or fulcrum
shaft M carried between the frames, so that when the tails or free ends h h¹ of the
toggle levers H H' are raised by the cams G G₁ the toggles are closed together to
form a straight or direct line of thrust on to the blank holder K which is thereby
carried down on to the metal sheet upon the die plate. We arrange the cams G G¹
in such a position on the crank shaft D that the crank, which we connect direct by
a connecting rod or rods O to the punch or former slide P may be a suitable
distance behind the blank holder slide K moving downwards, or we arrange. the
toggle levers H H JJ' in such a manner that when acted on by the cams G G¹
they will carry down the blank holder in advance of the force or punch slide
thereby permitting the blank to be held down upon the bolster plate or die plate of
the press while the punch or force R is drawing or forcing the metal into the die to
form the required dish or other article,
The return or upstroke of the force or punch slide P we cause to start the
opening movement of the toggle levers HJ H'J' by means of a thrust lever or
levers S S which we connect to the slide in such a manner that a tooth or series
of teeth or horn like projections TT formed on or attached to the distance
pieces of the toggle joints may be engaged by the lever or levers SS', so as to
force the toggles open and thus to raise the blank holder slides L L¹ to which they
are attached.
We sometimes dispense with these opening levers by mounting rack shaped
levers, or levers with teeth formed upon their ends, on the slide of the punch
which we cause to engage with teeth or horns on the toggle joint pieces or upon
discs with correspondingly shaped teeth formed upon them mounted on the joint
shaft. We prefer to employ balance weights U to balance the slides and blank
holder, and we carry these weights and levers overhead or we arrange them below
with rods V to transmit their pull or thrust to the slides; these weights U assist
the upward motion of the blank holder and at the same time relieve the crank
shaft of their weight upon the cams.
We provide adjustable stops and links so that we may regulate the position of
the blank holder to suit the thickness of metal which is to be operated upon; and
we employ any ordinary form of ejecting or extracting plates and levers for
delivering the articles from the dies or bolster.
The toggle levers H H as shown in detail at Figures 4, 5 and 6 we connect
together with a distance piece or distance pieces h² h4 formed upon them, or
we make them separately and place a loose distance piece between them on their
shafts.
We employ any form of clutch motion to disengage the gearing when it is
desired to stop and start the crank shaft at the termination of its upward stroke,
but we arrange with special advantage when it is desired to stop the crank shaft at
any position of its path, a clutch as shown in detail at Figures 7, 8, 9 and 10
having a jaw or a series of tongs, or gripping jaws W W which we bring together
to engage with an annular projection or ring X or annular projections carried on a
disc y or other driven or driving member of the press gearing.
We form this improved clutch with its tongs like jaws W W¹ arranged in one

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convenient manner so that a lever W2, Fig. 1 Fig. 2 which is liberated automatically
by the releasing of a horn W³ on a moving rod W4 by means of the cam plate
and lever w³ worked from the crank shaft (as shewn in detail elevations at
Figure 1) may cause a cone ring W5 (Figure 7) or a series of cones or rollers w¹
(Figure 1) to be drawn in and out so as to bring the lever ends W7 W8 of the jaws
apart or together, and thus to cause the opposite ends of these jaws W W to
release or to clip the projecting ring X, or the projections carried from the pinion
plate or other disc
y.
We may employ any number of these nipping jaws W W to engage with a like
number of projections w¹ but we prefer to arrange a continuous projecting ring X
as shown at Figure 7 to suit any particular requirement in which much friction
is to be produced by a lightly weighted lever, or by a slight pressure from
the hand.
We prefer to line our nipping jaws with wood or other suitable blocks as shown
at Figure 10 to permit of increased friction being produced, and to enable adjust-
ments for wear and tear to be readily made.
We place springs w behind the nipping jaws in suitable positions for enabling
ready withdrawal to be ensured when the pressure on the slide or sleeve is
removed.
We prefer to arrange our clutch levers W2 so that when the clutch is released
a pressure is applied to a brake lever Z to cause a block Z' to be thrust against
a brake pulley or brake wheel Z (as shown in Figure 2), which we mount
upon the clutch spindle shaft or in any other convenient position. Instead of
arranging a thrust block as at Z' we sometimes cause an ordinary brake band
or strap 3 to be tightened by the movement of the lever as shown at Figures 1
and 3.
We arrange our clutch lever and its connections so that it may work automatically
as shown by means of the catch or its equivalent connection from a moving rod
coming in contact with the clutch lever to throw the clutch in and out at the
desired position of the crank shaft. When we desire the clutch to remain in for
continuous working of the press we raise the rod from the surface of the crank
shaft operating cam or the cam plate, so that the cam does not touch the rod
or its connections when moving, thus preventing the clutch lever from being
drawn in and out except when it is controlled by the handle arranged upon the end
of the lever for permitting independent movement to be made at any time and at
any position of the crank shaft by the hand of the attendant.
By these improvements-we-are-enabled_to_set our presses to work automatically
stopping and starting the punch or tool at every stroke, or to run-continuously,.
while at the same time the hand lever is free for independent controlling purposes
for releasing and throwing in the clutch, thus holding or starting the punch or tool
at any desired position; the action of throwing out the clutch also simultaneously
putting on the brake.
We sometimes control our clutch jaws by means of independent cones such as w
passing in between rollers or jaw lever ends as shown in Figures 1 and 3 although
we prefer to actuate the levers by means of a conical ring such as W shown in
Figure 7 of the accompanying drawings.
We modify the form of our press and the arrangement of levers, gearing and
Farts to suit any particular requirement maintaining throughout the same
essential features of a quick return motion for the blank holder and a tenacious
grip from the clutch and the controlling levers as herein before described.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
1. The construction and arrangement of power presses in which a clutch is
employed for imparting the motion to the press tools having automatic disengaging
gear for permitting the crank shaft to be held in its extreme "up" position,

page_text: substantially as hereinbefore described and as illustrated in the accompanying
drawings.
2. The combination and arrangement of clutch levers and connections whereby a
brake is thrown on, when the clutch is released from its driving position, substantially
as hereinbefore described and as illustrated.
3. The combination and arrangement of clutch levers and parts connected there-
with whereby the press may be set in motion either by a hand controlled lever or
by an automatic movement of a rod operating the same clutch lever for permitting
continuous or intermittent motion, substantially as and for the purposes herein before
described and as illustrated.
4. In a press, the construction and arrangement of toggle levers in which
extended outer or free ends are employed for permitting rollers or cams to raise
them for the purpose of actuating the toggle levers, substantially as and for the
purposes hereinbefore described.
5. In a press, the construction and arrangement of a toggle opening device such
as ST ST substantially as and for the purposes hereinbefore described and as
set forth in the accompanying drawings.
Dated this 8th day of September 1893.
MARKS & CLERK,
.13, Temple Street, Birmingham, Agents for the Applicants.