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ÜCÍ- 22, 1946»
Filed July 2°, 1941
5 sheets-sheer 1
Oct. 22, 1946 °
Filed July 22, `1941
5 Sheets-Sheet 2
` Oct. 22, 1946.
Filed July 22, 1941
_»-l lìi
3 Sheets-Sheet 5
. 9
Patented Oct. 22, 1946
James P. Barbour, Philadelphia, Pa., assìgnor to
The Baldwin Locomotive Works, a corporation
of Pennsylvania
Application July 22, 1941, Serial No. 403,495
8 Claims. (Cl. ’Z8-0.5)
This invention relates generally to presses es
pecially for forming briquettes and relates more
the relation of the operating rams and plungers
at the instant when breaking of the toggle mecha
particularly to improved means for controlling
nism is initiated;
the briquetting operation to avoiddamage to
Fig. 8 is a transverse section taken substan
tially on the line 8_8 of Fig. l with certain parts
the press in the event that an abnormal oper
ating condition occurs.
ABriquet presses whether of the mechanical or
omitted for sake of clarity; and
Fig. 9 is a section on the line 9_9 of Fig. 3.
In the particular embodiment of the inven
hydraulic type are arranged to compress loose
tion disclosed herein for purposes of illustration,
material such as metal chips or lathe turnings
I have shown my invention embodied in a bri
into small compact briquettes. One difficulty in
quetting press of the type disclosed in Smith et
this type of press is the possible failure of the
al. United States Patent 1,473,389. For purposes
machine to eject a completed briquet in which
of simplicity many of the parts of this type of
case a second briquet tends to be formed while
press are omitted from the disclosure herein but
the first briquet still remains in the machine.
It is an object of my invention to provide im 15 it may be considered to be identical to that dis
closed in said Smith et al. patent except Where
proved means for rendering the press inoperative
certain details are changed to adapt my im
automatically upon occurrence of a predeter
provement thereto.
mined abnormal operating condition, such for
Briefly, the press consists of four horizontal
example as the failure to properly eject a formed
product. A further object is to provide improved 20 tie rods I, Figs. 1 and 8, for holding together
longitudinal frame sections 2 and for supporting
means for automatically preventing damage to
stationary transverse crossheads 3 and 4 and a
the press in case the briquetting mold is filled
fixed material hopper 5. The lower end of hop
with an excessive quantity of material.
per 5 is provided with a discharge opening '6
Another object is to provide improved means
for relieving a coniining force on the briquetting 25 through which material is forced by a compress
ing plunger 'I slidable through one side of the
material automatically in the event an excessive
lower end of hopper 5. The plunger 'I is secured
amount of material accumulates in front of the
to a movable crosshead 8 which is actuated by
compressing plunger.
a ram 9 in a stationary cylinder I0. To move
A further object is to provide an improved
toggle mechanism and means for breaking the 30 ram 3 and plunger 'I forwardly a pressure gen
erating ram II extends through the rear end of
same to relieve the compressing pressure auto
cylinder I0 and is actuated by a suitable rotating
matically when excessive material accumulates
I2 and connecting rod I3, the crank
in the briquet mold.
shaft being rotated by any suitable motor and
Other objects and advantages will be more ap
parent to those skilled in the art from the fcl 35 gearing (not shown).
Placed in alignment with the hopper outlet 6
lowing description of the accompanying draw
is a floating mold IlI having a pair of stripper
ings in which:
actuating rods I5 slidably extending through a
Fig. 1 is a longitudinal section through a
briquetting press embodying my improved toggle
reciprocating mold actuating crosshead I6, the
crosshead I6 during its rearward stripping action
movement. The crosshead I6 is adapted on its
foward movement (to the left, Fig. 1l to move
mold I4 against hopper 5 whereby material may
control which is shown in its normally operative 40 rods being provided with nuts I‘I for engaging
Fig. 2 is a fragmentary longitudinal section
similar to Fig. 1 but showing the toggle mecha
nism in its broken position together with release
of the mold to allow discharge of a second 45 be transferred from the outlet 6 into the mold
by plunger 1. To accomplish this forward or
closing movement of mold I4 a pair of plungers
Fig. 3 is an enlarged fragmentary section show
I8, connected to crosshead I6, moves forwardly
ing the toggle mechanism and operating means
in a pair of cylinders I9 formed within station
therefor in its“ normally operative position;
Fig. 4 is an. enlarged fragmentary section 50 ary crosshead 4 thereby to maintain a forward
force on‘ a second pair of plungers 20 which are
showing the toggle mechanism in its broken posi
connected to mold I4.
The mold actuating cylinders I9 are connected
Fig. 5 is a plan View of the> toggle mechanism
to any suitable source of constant pressure such
with certain parts omitted for sake of clarity;
Fig. 6 is an enlarged fragmentary sectional 55 as an intensifier or accumulator (not shown)
through a pipe 2| and similarly the main com
view showing the abnormal presence of two
pressing cylinder Iß is .connected by a pipe 22 to
briquettes in the press mold and disclosing the
a source of constant pressure specifically shown
relation of the operating rams and plungers just
in the form of an intensifier 23. To reciprocate
prior to the automatic breaking of the toggle
60 the plungers I8 against the action of the con
lFig. 7 is a view similar to Fig. 6 but showing
stant ‘pressure in pipe 2I`the crosshead I6 `is
mechanically reciprocated by a crank arm 25
has initially moved crosshead 3l and plunger
secured to a shaft 26 which is suitably journalled
in stationary crosshead 3 while an operating arm
2ï also secured to shaft 26 is o-scillated 'by the
connecting rod 28 extending forwardly to a piv
oted lever 29, link 29', connecting rod 30 and'
crosshead 3l to which rod I3 is connected. This
operating connection insures closure of mold I4
Il on its compressing stroke (to the right) suf
ficient to close mold E and compress iiuid in cyl
inder I9. Continued compression of fluid in cyl
inder Iß accordingly moves plunger 9, crosshead
3 and compressing plunger l to the right so as to
force material from hopper 5 ahead of plunger 'I
intofmold cavity i4. Lateral resistance between a
during initial forward movement of compressing
partially formed briquet and the side walls of mold
plunger l, it being understood that after closure 10 I 4 will cause the mold to move or iloat slightly to
of the mold any additional movement of the con
nection 3l! will be taken up :by movement of link
'29’ relative to lever 29 when the latter is in its
horizontal position as shown in Fig. 1 but any
small further movement that might be imparted
to lever 23 is allowed by movement of plungers
I 8 within the cylinders I9, all as described in
the right under continued compressing movement
thereby expelling liquid from cylinders I9 back
into the source of constant pressure connected to »
pipe 2 I. During this floating action rods I5, Fig. 1,
will slide through> crosshead I6. vThe briquet'55
is ñnally fully compressed against a station
ary backing plunger 53 secured to stationary
crosshead 4. Upon completion of this compress
ing action crankshaft I2 moves crosshead 3l and
said Smith et. al. Patent 1,473,389, thereby in
suring that mold I 4 is held ñrmly in contact with
the hopper 5. The crank arm 25 transmits 20 connecting rod I3 to the left and by ’reason of
motion to the crosshead I5 andY plungers I8
nuts 5I engaging crosshead 8 plunger 'I is'with
through a normally aligned pair of links 32 and
drawn and simultaneously floating moldV I4 is
33 respectively connectedvto crossheadv I6 and
moved to the' right through the action of'links
arm 25 by pivots 34 and 35 and are connectedV
together by a pivot pin 36. These links consti 25 30, link 29', lever 29 and link 28 which causes
arm '25 to rotate in a clockwise direction. Arm
tute a toggle by themselves and when held in
25 thus pulls on the links 32 and 33 and cross
rigid alignment also constitute one link of a
head IG to engagev nuts Il and'accordingly pull
toggle with arm 25. The sections 32 and 33
the moldA away from> the hopper and over there
are normally held in rigid alignment by a cylin
maining portion of backing plunger 53 thereby
der 3l, Figs. 3 and 9, pivotally supported as at 30 to force or strip the briquet out of the mold.
38 to link 33 while a piston 39 is pivotally con
The-` discharged briquet> will fall upon a suitable
nected at 49 to an arm 4I formed rigidly with
link 32, Figs. 3 and 4.
conveyor or container
Constant fluid pressure
supplied from any suitable source> (not shown)
through a pipe 45 to the left closed end of cyl
inder 31 causes the piston 39 and cylinder 31
generally indicated at
O-n‘the next compressing’stroke of cross
head 3i the links-39, connecting rod`23 and' arm
25 will relatively rapidly return the crosshead
I6 to its normal position during the'relatively
slow initial compressing movementgof plunger 1
and accordingly reclose >the mold preparatory to
being recharged for the next briquet. If for any
to pull pivots 38 and 43 toward ‘each other and
accordingly force links 32 and 33 downwardly
into alignment as shown in Fig. 3. To limit the
downward movement of these links a pair of stops 40 reason the briquet previously formed was Vnot~
42 and 43 are formed respectively on said links
so as to engage each other when these links
are in alignment. To effect the foregoing action
fluid pressure in the right end of cylinder 3l is
exhausted through a pipe 46 and valve 44 while
the latter is in the position shown in Fig. 3.
When valve 44 is in the position of Fig. 4 fluid
pressure from any continuous source such as
an intensiiier 23 connected to a pipe 22 is sup
plied to the right end of cylinder 3l `to move
pivots ‘38 and 40 away from each other. thereby
breaking links 32 and 33 as shownin Fig. 4 andr
allowing mold actuating crosshead I6 to have
free movement toward the right for .rendering
the briquetting action inoperative as hereinafter
described regardless of the continued actuation
of crank arm 25. The cylinder 3l Vand piston rod
will swing aroundpivot 38 during movement of
crosshead i6.
The valve 44 is manually moved to its-.posi
tion shown in Fig. 3 whereasmovement toits
discharged from the mold I4, then .it is seen that `
the next briquet 56 will be‘form‘ed' against the
first briquet within the mold‘and consequently
there is danger of jamming certain parts. When‘
this occurs the compressing movementof plung
er l will be vstopped prematurely, although move
ment of ram II may ‘be normal by reason of the
fluid in cylinder ill' .being discharged through
pipe 22'to intensiñer 23. However, care mustfbe
taken not to have ram II hit plunger 3V which
may. result` in damage to various par-tsio'f the
press equipment. `When plunger 'I andits cross
head 8A stop prematurely, then rods 5'9'will con
tinue to move tothe right until cam 49 engages
switch arm 58 thereby closing switch 48 to ener
gize.. solenoid 4l and accordingly move Vvalve 44,
Fig. 4, to thejleft.. This immediately admits-fluid
pressure from intens'iiierl pipe 22.through. pipe
45 to the right end" of cylinder 3l and accord
ingly breaks the aligned position of links 321`and
33'as shown in Fig. 4 whereby'constant pressure
position of Fig. 4 is upon energization». of a sole
in cylinders ,i9 moves rams i8’ rear-wardlyf'an'd
noid 47.` The solenoid is energized upon closure
thereby causes crosshead I5 to engagenuts 'I'I to
of a switch 49, Fig. 1, mounted upon and mov
'move'mold I4 to the right for- stripping whatever
able with crosshead 8. ‘The switch is adapted to 65 excess material may bein the mold for forming
be closed by a cam 49 formed >on one of >a plu
rality of pull‘back rods 53 connected to crosshead
3I Vand slidably extending through crosshead 8,V
the second briquet and for, renderingineiîectual'
the .compressive‘eiïect of plunger g1; Breaking-of
the toggle ' links ‘ will preventY the moldi'being- re
although a pair of nuts 5I on saidv rods are adapt
‘closed and hence further briquettes cannot. be
ed t0 engage crosshead 8 tohold the same to 70 made until‘the operator removes the'ñrstbriquet l
the left upon return movement of crosshead 3|.
that is stuck> in the 'mold' and> thenresetsth'e
toggles32, and’33 by manually shifting vali/e744"
to the right.
One reason for briquettes sticking in the'mold "
tion shownin'Fìg. 1 and that the crankshaft I2 75 is that after the' backing plunger 53 o_r the walls
Assume that the press elementsare in the ‘posi
4. The combination in a press comprising a
mold in which material is formed, a plunger for
compressing material in said mold, power means
of mold hl become worn, shavings or chips forced
into the worn clearance assume the character of
a flange or ñn which supports the briquet on the
having relatively yieldable elements for actuat
ing said plunger, means actuated in response to
a predetermined relative movement between said
yieldable elements occurring upon accumulation
end of the backing plunger 53 and accordingly
does not drop off when the mold is moved to its
stripping position.
From the foregoing disclosure it is seen that I
of excess material in said mold, and means con
have provided a press in which excess or abnor
trolled by said responsive means for effecting ejec
mally accumulated material in the working path
tion of said excess material from the mold.
5. The combination in a press comprising a
of the opposed working members, such as the
plungers 'i and 53 will be automatically released
mold, opposed plungers for operating upon `ma
so that ejection of the excess material or work
terial within said mold, power means having rel
piece takes place in a simple and direct manner
and the machine is rendered inoperative until
normal operating conditions are restored. While
the work-piece herein described is speciñcally in
the form of a briquet which is of substantial thick
ness, yet the p-rinciples of operation of my im
atively movable hydraulic elements for relatively
moving said plunger to compress said material
within said mold to a substantially predetermined
thickness, means whereby upon occurrence of eX
cess material within said mold the hydraulic ele
ments have a predetermined relative movement
between each other, and means controlled by one
of said elements to control further compressive
proved combination are applicable to products of
various thicknesses including sheet metal. It is
also seen that the structure for accomplishing
this mode of operation is relatively economical
in construction, operation and maintenance and
has maximum compactness by reason of the
action on the material.
6. The combination in a press comprising a
floating mold, opposed plungers between which
material is compressed within said mold, tog
gle operated mechanism `for stripping compressed
material from Said mold, said toggle mechanism
breakable toggle link being part of the normal
operating mechanism which specifically is part
of the stripping means.
It will of course be understood that various
changes in details of construction and arrange
ment of parts may be made by those skilled I
in the art without departing from the spirit of
the invention as set forth in the appended claims.
I claim:
1. The combination in a press comprising op
including a .collapsible link that is operable as
a rigid link during said stripping, and means
for collapsing said link to effect an additional
stripping action by said mold so as to render in
effectual the compressive effect of said 'plungers
7. The combination in a press comprising a
floating mold, opposed `plungers between which
material is compressed to a predetermined ex
tent within said mold, a plurality of :relatively
posed working members between which a work
piece is engaged, power means for effecting rel
ative working ymovement between said members
to form the work-piece, means for normally eject
yieldable hydraulically actuated elements for
ing the work-piece, means rendered operative by
moving one of said plungers until it stops at the
end of said compressing operation, toggle oper
said power means automatically in response to
an accumulation of material between said op
posed working members upon failure of the
cluding a collapsible link that is operable as a
formed work-piece to be normally ejected, and.
means controlled by said responsive means for
automatically effecting ejection of said additional
material upon occurrence of its accumulation.
2. The combination in a press comprising op
posed working members, power means for effect
ing a substantially predetermined relative move
ment between Said members to compressively pro
duce a work-piece of substantially desired thick
ness, means rendered operable by said power
means automatically upon failure of said mem
bers to obtain said predetermined relative move
ment, and means controlled by said latter means
whereby the compressive action of said members
is rendered ineffective automatically upon failure
to obtain said predetermined movement.
3. The combination in a press comprising op
posed working members between which a work
piece of substantially a, predetermined thickness
is compressively produced, power means for
effecting a substantially predetermined relative
movement between said members so as to pro
duce said thickness, means rendered operable by
movement of said power means automaticallyin
response to failure of said members to produce '
a work-piece of substantially said predetermined
thickness, and means whose operation is ini
tiated by said last mentioned means whereby said
compressive action is rendered ineiîectual auto
matically when said members fail to produce a
work-piece of substantially said desired thick
ated mechanism for stripping compressed mate
rial from said mold, said toggle mechanism in
rigid link during said stripping, means actuated
in response to a predetermined relative movement
between said power elements for collapsing one
of said toggle mechanisms thereby preventing
said'plungers from completing their compress
ing operation, and means for effecting a strip
ping action by said mold automatically upon col
lapse of said toggle mechanism.
8. The combination in a, press comprising op
posed material engaging members for operat
ing upon a work-piece, power means for mov
ing one of said members through a substantially
~ predetermined work stroke, means whereby said
power means is adapted to continue :its opera
tion even though said movable material engag
ing member is stopped prior to the completion of
said stroke, mechanism for controlling the oper
ating effect, of said members on a work-piece upon
occurrence of said prior stoppage of said mov
aible member cooperating control elements one
of which is associated with said power means vso
as to be movable therewith and the other of
which is associated with said movable work mem
ber so as to have the movements thereof and
said control elements .being so relatively posi
tioned that upon said prior stoppage of said mov- j
able work _member the control elements are rela.
tively moved into coacting relation, and means
initiated by the coaction of said elements to
render said mechanism operative.
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