Year: 1899

page_text: Date of Application, 21st July, 1899
Complete Specification Left, 5th Apr.. 1900-Accepted, 12th May. 1900
We, JOHN BOULTBEE BROOKS, Managing Director, and JOHN HOLT, Works
Manager, both of Criterion Works, Great Charles Street, in the City of Birming-
ham, do hereby declare the nature of this invention to be as follows:-
:—
This invention relates to the stop motions, or means for connecting and dis-
connecting the tool slide with the power-driven shaft and its excentric crank
or in power presses employed in cutting-out, drawing-through, rivetting and
performing other operations on metals or other materials.
o
According to one form of our invention, the tool slide of the press which is
arranged to work within guides made adjustable as usual for determining the
friction between them and the said slide, is formed with a vertical slot, of a
length greater than the throw of the driving crank or excentric, and fitted with a
loose block, coupled with the said excentric by a connecting rod and adapted,
when the press is out of gear, to work idly up and down the said slot without
imparting any corresponding movement to the tool slide, which is retained at
the upper end of its stroke by the friction between it and its guides.
Located within a sleeve or other guide disposed behind the slide and coming
coincident with the lower end of the slot therein, is a horizontally working
coupling bolt connected by a swinging link to a foot or hand operated lever or
system of levers so arranged as to impart a forward movement to the bolt on being
depressed and take it into engagement with the slot in the slide and so form a
solid intervening connection between the vertically-reciprocating block and the
slide, which now makes a descending and ascending movement or stroke and the
bolt is permitted to move with it by the swinging link before referred to. On
the foot lever being moved in the opposite direction, the bolt is withdrawn
thus throwing the slide out of gear and leaving the driven block to run on idly
as before.
According to another form of our invention, we mount within suitable bearings
in the framing of the press, a pair of separated discs connected with and driven
by the power shaft, with an excentric cross pin disposed between them, to
which is connected a suspended split or other hearing adapted, on the rotation
of the said discs or excentrics to make a rising and falling movement between them.
Directed through the said bearing and free to move longitudinally therein, is a
coupling bolt or rod, so arranged that its outer end may be engaged with a slot
in the back of the tool slide of the press and cause the same to make a stroke
corresponding in length to the throw of the excentrics.
The bolt rod is connected at its rear end to a bell-cranked or other lever pivoted
to the frame and rocked for imparting the forward traverse to the bolt for
taking it through the bearing and into engagement with the slide, by a connecting
rod and foot or hand-operating lever, whilst its return movement or disengage-
ment is effected by a suitably arranged spring constantly acting to keep the bolt
out of the slide, so that the slide is only kept in gear with the driving excentrics
so long as the operative keeps the hand or foot lever depressed.

page_text: A stop is provided in conjunction with the system of levers for limiting the
forward movement of the bolt, whilst the slot in which the bolt engages may
be formed in a separate adjustable part-suitably connected with the tool slido
of the press.
We, JoHN BOULTBEE BROOKS, Managing Director, and JoHN HOLT. Works
Manager, both of Criterion Works, Great Charles Street, in the City of Birming-
ham, 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 stop motions, or means for connecting and dis-
connecting the tool slide with the power-driven shaft and its crank or excentric
in power presses employed in cutting-out, drawing-through, rivetting and
performing other operations on metals or other materials.
Figure of the accompanying drawings represents a front elevation of a
power press fitted or
provided with an improved stop motion constructed according
to one form of our invention.
Figure 2 represents a transverse vertical section of the said press and stop
motion, the several parts in both these figures being shown in the positions they
respectively assume when the stop motion is thrown out of gear and the tool
slide is stationary.
Figure 3 is a similar sectional view of the said press and improved stop motion
to that represented in Figure 2, but in this figure the stop motion is shown
in its operative position and forming the connection between the vertically
reciprocating tool slide and the coupling rod from the excentric on the power
shaft.
Figure 4 represents a horizontal section of the body and slide of the press,
taken upon the dotted line a, Figure 2.
to 4.
The same letters of reference indicate corresponding parts in the said Figures 1
According to this form of our invention, the tool slide a of the press, which is
arranged to work within guides b made adjustable as usual for determining the
friction between them and the said slide, is formed with an upright slot c. of a
length as great as, or greater than the throw of the driving crank or excentric d',
connected with the power shaft d. This slot is fitted with a loose block e, coupled
with the said excentric by a connecting rod and adapted, when the press is out
of gear, to work idly up and down the said slot without imparting any corre-
sponding movement to the tool slide, which is retained at the upper end of its
stroke as represented in Figures 1 and 2 by the friction between it and its
guides.
Located within a sleeve or guide f disposed behind the slide and coming
coincident with the lower end of the slot therein, is a horizontally working
coupling bolt g jointedly connected at g', to the forward end of a swinging

page_text: link h, whose other end is, in turn, jointed to the arm i, of a bell cranked
lever pivoted at 2, to a bracket on the back of the body of the press, and
having the other arm jointed to the upper end of a connecting rod, pro-
ceeding to treadle or hand lever (not shown), which is so arranged as to impart
a forward movement to the bolt on being depressed and thus take the said bolt
into engagement with the slot in the tool slide a, and so form a solid intervening
connection between the vertically-reciprocating driving block e and the said
slide, to which a descending and ascending movement is imparted, the bolt
being permitted to move up and down with it by the swinging link forming
the connection between it and the treadle or hand lever mechanism.
The said treadle or hand lever is retained in its depressed position either by
means of a suitable catch, or by the "operative" keeping his hand or foot upon
the lever, for so long as the tool slide is required to reciprocate, but when the
said lever is released, the bolt is withdrawn clear of the slide and taken, together
with the other parts, into the inoperative position represented in Figures 1 and 2
by the contraction of a spring such as disposed between the connecting rod
and a fixed part of the press, a suitable stop such as ', being arranged in con-
junction with one of the arms of the lever i for limiting the backward movement
of the said slide of the stop motion, which, when thrown out of gear as described,
leaves the driving block to reciprocate idly within the slot in the tool slide
which remains stationary at the top of its stroke until the bolt is again advanced.
The power shaft of this form of press is driven directly by means of a pulley,
and the tool slide is arranged to reciprocate upon the front or face of the
head, which has a gap, directed through from the front to the back within
which the connecting bolt g and its guide f are located, the said gap having a
vertical clearance greater than the throw of the tool slide to admit of the bolt
moving with the slide and of the connecting link h, making its swinging move-
ment up and down with the bolt.
Our invention, is, however, equally applicable to other types of power presses,
such, for instance, as that represented in Figure 5, which shows a sectional view
of practically the same form of stop motion applied to a press driven by spur
gearing.
In this press, is the tool slide reciprocating vertically in guides arranged
at the front of the separated cheeks 1, of the body, the position of the said slide
being adjusted as usual by means of loose packing pieces and set pins 7+, or
otherwise as may be desired. The power shaft is driven by means of a pulley
and toothed wheels 7, 7, and its motion is communicated to a loose block e.
working within a vertical gap c. in the tool slide, by means of a crank ', and
connecting rod, the said block e and tool slide a, being coupled together by
means of a sliding stop-motion bolt g, working in a guide f carried by the slide,
and coincident with the lower part of the gap in the same, and operated in one
direction by hand or treadle lever, connecting rod i bell cranked lever, and
swinging link h, and in the other direction by means of a spring disposed between
a suitable fixed and moving part of the mechanism, or by means of a counterpoise
weight, or the like. When the bolt has been advanced into the gap in the slide
for coupling the latter to the block e, the slide is actuated and the holt and its
guide move with the said slide in the clearance 12, between the cheeks 1, sup-
porting the guides, power shaft bearings and other parts of the mechanisin
whilst the connecting link between the said bolt and its operating lever rocks
or swings in a vertical plane upon its joint connections g, h, without inter-
fering with the movement of the slide. When the hand lever or treadle is
liberated, the bolt is withdrawn by the spring or weight and the tool slide comes
to rest, while the driver block e continues to reciprocate idly within the gap e.
Figure 6 represents a front elevation of a power press provided with another
form of stop motion constructed and arranged according to our invention.
Figure 7 represents a transverse vertical section of this press, upon the dotted
lines, Figure 6,

page_text: According to this form of our invention, the power shaft is provided with
an excentric to which is connected a suspended split or other bearing f, adapted
on the rotation of the excentric, to make a rising and falling movement. Directed
through the said bearing from the back, and free to move longitudinally therein
is a coupling bolt or roil g, so arranged that its outer end may be engaged with
a slot or socket of an adjustable block c, carried by the tool slide a, of the
press, which said slide makes a stroke corresponding in length to the throw of
the excentric.
The bolt rod is connected at its rear end to a bell cranked or other lever i
pivoted to the frame and rocked for imparting the forward traverse to the bolt
for taking it through the bearing and into engagement with the slide, by a con-
necting rod and foot or hand operating lever, whilst its return movement or
disengagement is effected by a suitably arranged spring or weight constantly
acting to keep the bolt out of the slide, so that the said slide is only in gear
with the driving excentrics so long as the operative keeps the hand or foot. lever
depressed.
A stop is provided in conjunction with the system of levers for limiting the
forward movement of the bolt, whilst the slotted block in which the bolt engages
is so arranged as to admit of turning within its bearings for conforming to the
angular movement made by the bolt in actuating the slide.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what
we claim is:-
First In stop motions for power presses; operatively connecting the tool
slide to the power shaft by means of a traversing bolt or coupling, suitably
operated and adapted to be engaged with a slot in the slide and form a solid
intervening connection between it and a driving block which reciprocates idly
within the said slot when the bolt is disengaged therefrom, the said bolt working
within direction guides carried by and moving with the said tool slide, sub-
stantially as herein described, and also as set forth in Figures 1 to 5 of the accom-
panying drawings.
Secondly-In stop motions for power presses as referred to in the preceeding
claim operating the traversing coupling or bolt of the tool slide by lever
mechanism and a swinging link, such as h, substantially as herein described, and
also as set forth in the accompanying drawings.
:
Thirdly In stop motions for power presses; operatively connecting the
tool slide to the power shaft by means of a rocking and traversing bolt or
coupling, working through a hanger or suspended bearing to which a rising and
falling movement is imparted by cams or excentrics on the power shaft, and
adapted to be engaged with an eve, socket or equivalent of the tool slide, sub-
stantially as herein described, and also as set forth in Figures 6 and 7 of the
accompanying drawings.
JOHN BOULTBEE BROOKS,
JOHN HOLT,
By Henry Skerrett,
24, Temple Row, Birmingham, Agent for Applicants.