Improvements in Brick-making Machines.
Year: 1889

page_text: Date of Application, 24th Dec., 1889-Accepted, 15th Feb., 1890
COMPLETE SPECIFICATION.
Improvements in Brick-making Machines.
We, BRUCE CLARK WHITE, Mechanical Engineer, residing at 5100 Lake Avenue
and JAMES ANGUS BOYD, Manufacturer, residing at the Sherman House, corner of
Clark and Randolph Streets, both in the City of Chicago and State of Illinois, United
States of America, 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 that class of brick making machines in which the clay is
fed automatically to a mold or molds and is compressed therein by opposite plungers
which are movable towards and from each other to compress and release the brick and
which are also movable to discharge the finished brick from the mold.
In the accompanying drawings which illustrate my invention :
Figure 1 is a front elevation of the entire machine.
Figure 2 is a rear elevation of the same.
Figure 3 is a vertical section on line 3-3 of Figure 1.
Figure 4 is a detail section on line 4-4 of Figure 3.
Figure 5 is a detail section on line 5-5 of Figure 3.
Figures 6, 7 and 8 are detail sections showing different positions of the lower
plunger and means for supporting and actuating the same.
Figure 9 is a vertical section on line 9-9 of Figure 3 showing the feed box in
elevation.
Figure 10 is a detail side view of the feed box and its guides.
Figure 11 is a vertical section showing different positions of the beam and related
parts in actuating the plungers.
Figure 12 is a detail plan section of the mold table taken upon line 12-12 of
Figure 3.
Figure 13 illustrates a modified construction of the fulcrum of the beam.
Figure 14 shows a weight employed in place of a spring to lift the lower plunger.
Figure 15 is a detail section on line 17-17 of Figure 3.
Figure 16 is a perspective view of certain of the parts shown in Figure 15.
Figure 17 is a front elevation of parts of the brick machine adjacent to the mold
table.
Figure 18 is a cross section of the same taken upon line 2-2 of Figure 17.
Figure 19 is a vertical cross section of the same taken upon line 3-3 of Figure 18.
Figure 20 is a horizontal section of the same taken upon line 4-4 of Figure 17.
Figure 21 is a perspective view of a partition plate which separates two of the
molds.
Figure 22 is a plan view of the mold table with its ends broken off and showing a
similar modified construction and certain details thereof.
Figure 23 is a perspective view of the lining plates and partition shown in
Figure 22.
Figure 24 is a plan view of a mold table having only two molds, similar to
Figure 12 hut containing an additional feature.
First describing Figures 1 to 16 inclusive, A A are two heavy vertical frame-plates
arranged parallel with each other at opposite sides of the machine and attached at
their lower ends to a massive base A. The said frame-plates A A embrace two
vertical standards A2 A2 which afford bearings for the vertically movable part of the
machine and said frame-plates are connected with each other at the top of the frame
by a horizontal cross girt A³. B is a mold table located at a suitable distance above
the base A¹ and between the standards A2 A2 of the frame-plates to which it is bolted
at its ends. Within said mold table are located the molds CC of which the machine
D
1

page_text: shown in the above mentioned Figures is provided with two. Said mold table is
shown in the Figures now being considered as comprising two separate castings B¹ B³
(Figures 3 and 12) located in front and rear of the molds, which latter are formed by
means of inwardly projecting parts B³ B³ cast upon the front and rear portions B¹ B³
of the table meeting at the center line of the table. The castings B1 B2 are held
together by means of horizontal bolts bb passing through said castings, between the
molds and at the ends of the castings, in the manner shown. The castings B₁ B² are
secured to the frame standards A2 A2 by means of horizontal bolts 61 6¹ inserted
through wings 62 63 at the ends of the castings B' B2 and through the said standards.
Said parts B1 B2 of the mold table for the purpose of giving a rigid and unyielding
support to the said table and to prevent the same from springing or yielding in its
center under the heavy strain incident to pressing the brick, are provided with vertical
webs B B which extend downwardly to and rest or bear throughout their full
length upon the frame base A'. The said webs are extended to and fitted at their
side edges against the frame standards A2 A2 and provided with horizontal flanges
at their lower edges, through which flanges and the base are inserted bolts 66 67
affording a rigid connection between the parts. The webs B B7 bolted to the frame
base in the manner shown, serve to transmit to said base a part of the strain coming
upon the table, and at the same time hold the adjacent parts rigidly and strongly from
either lateral or vertical displacement when the machine is in action. Said webs Be B²
are provided with openings and points beneath the molds, in the manner shown, to
afford access to the lower plungers for supplying steam thereto, and for reaching the
adjusting devices connected therewith, which are hereinafter described. To afford a
strong connection between the mold table and the frame standards A³ the latter are
provided with notches or mortises a a at their inner faces, within which notches or
mortises the ends of the castings B1 B2 are inserted, and within which they are held
by means of the bolts 62 61. The castings B1 B2 in the particular construction shown,
form the parts of the mold table immediately adjacent to the molds.
Horizontal extensions of said table at the front and rear of the molds, for the
purpose of supporting the feeding devices for the clay and the finished bricks, are
formed by a horizontal plate B at the front of the molds, which plate is bolted to the
casting B', in the manner shown, and by a second horizontal plate B5 which is located
at the rear of the casting B2 and is sustained at its front edge by resting upon the said
casting B², which latter is provided with a recess or rabbet to receive it, and at its
rear end by attachment at its side edges to the horizontal girts A³ A³ (Figure 3)
forming parts of the frame-plates, the particular attaching device shown consisting
of inwardly projecting lugs upon the girts to which the said plate B³ is bolted at
its rear corners, in the manner illustrated.
DD are a series of plungers constructed to enter and slide in the upper parts
of the molds CC, said plungers being attached to a horizontal cross-head D¹ located
above the mold table B. E E are lower plungers_constructed to slide in the
molds CC and attached to a single rigid cross-head E¹ located beneath said mold
table. FF are two heavy vertical bars which are mounted in guide surfaces a¹ a¹
formed in the inner faces of the frame standards A2 A2, engaging corresponding
guide surfaces upon the bars. Said bars extend from a point near the bottom of
the machine, through the ends of the frame standards A² A². The bars are held or
guided at two points only, one at the top of the frame standards and the other just
above the mold table, the guide surfaces a¹a' being relatively short and located at
these places only.
At their parts below the mold table, the slide bars are free from the standards and
are without guides, any bearing surfaces at these points being undesirable from the
fact that the clay and dirt which falls from the mold table is liable to cover or
enter between the surfaces in contact in case any guides are present. At their
lower ends the slide-bars F F are provided with inwardly extending projections ff
entering notches or rabbets ee in the ends of the cross-head E, the bars being
attached to the cross-head by means of bolts passing through the said bars and engaging
the cross-head.

page_text: The slide bars are held in place at the middle guides by means of detachable parts a² a²
which are bolted to the front edges of the frame standards and form the front
walls of the guide ways. At the top of the frame the slide-bars are held in place
by the cross-girt A' which is secured at its ends to the frame standards in such manner
that its inner face forms the bearings for the edges of the slide bars. The upper
cross-head D' has bearings at its ends against, and is vertically guided by, the slide
bars and the surfaces a' a¹. As more clearly shown in Figure 5, the end surfaces of
the said cross-head are fitted to slide against the inner faces of the slide bars, while
said cross-head is provided near its front face with two vertical flanges d d, which
extend past or overlap and bear against the front edges of the said slide-bars.
G G are toggle arms which are pivoted respectively to the upper ends of the
slide-bars F F and to the upper cross-head D¹. The upper end of the upper toggle
arm G is desirably made the full width of the space between the slide-bars FF,
as clearly shown in Figures 1 and 2, and said toggle arm is pivotally connected
with the said slide bars by means of a heavy pivot pin G2 fixed at its ends in the
slide-bars and extending through a long bearing aperture in the toggle arm. The
lower toggle arm G₁ is constructed to enter a recess in the upper surface of the
cross-head D¹ and is pivotally connected with the latter by means of a pivot pin G³
inserted through bearing apertures in opposite ends of said cross-head and in the
lower end of said toggle-arm. The toggle-arms G G¹ are pivotally connected with
each other by means of a heavy pin G inserted through the overlapping, forked
ends of said toggle-arms, said pin being also adapted to engage a heavy beam H by which
power is applied to the toggle arms. Said beam engages the center of the pin G+,
and the toggle arms are centrally recessed to afford space for the entrance of the end
of said beam between their parts in bearing with the pin, in the manner illustrated in
the drawing.
I is a heavy crank-shaft mounted in bearings a³ a³ in the frame-plates A A, said
crank-shaft being located approximately in the same horizontal plane with the pivot
pin Gand some distance to the rear of the toggle arms. Said crank-shaft is
provided with a heavy crank-pin I¹ with which the beam H is engaged. The said
crank-shaft I is so disposed with relation to the toggle arms G G¹ that in the rotation
of said shaft said toggle arms will be alternately straightened out and flexed by the
action of the crank and beam. Said parts are so disposed, furthermore, that the
toggle arms will be straightened out or brought into alignment with each other
at the time the crank-pin is at the extreme limit of its throw away from the
toggle-arms.
The beam H is herein shown as provided with a bearing engaged with the crank-
pin I', which bearing is provided with an adjustable cap ¹ located at the top of the
beam, the end of the beam being extended beneath the crank-pin and made heavy
and strong at this point in the manner illustrated. Beneath the crank-pin is desirably
placed an adjustable bearing block 2, beneath which may be placed a thicker or
thinner plate or shim h³, or other adjusting device, by which the block may be
adjusted vertically toward or from the beam. The adjustment of the block h³
obviously changes the vertical position of the end of the beam engaged with the crank-
pin and also with that engaged with the toggle arms, so that a means is thus provided
for adjusting the vertical positions of the plungers, the vertical movement of which
latter is controlled by said beam in a manner hereinafter more particularly pointed
out.
The action of the toggle in forcing the plungers toward each other obviously tends
to thrust both the upper ends of the slide bars and the upper cross-head horizontally
toward the rear. By reason of the presence of the flanges d d of the said cross-head
in bearing against the front edges of the slide-bars, however, such horizontal com-
ponent of the oblique pressure of the toggle arms is taken by the upper and middle
parts of the slide-bars, instead of coming partially on the frame standards through
the cross-head.
J is a pin or shaft mounted horizontally in the frame-plates A A beneath the
beam H, and having its ends secured in two hubs a* a* upon the frame-plates. Upon

page_text: said shaft are mounted two vertically arranged oscillating arms J¹ J₁ which are made
concave upon their upper ends and are adapted to engage the ends of a heavy pin H¹
which is secured in the beam H between its ends and preferably nearer that end of the
beam engaged with the toggles G G¹. J2 is a roller mounted upon the shaft J
between the arms J1 J1 and adapted to engage the lower surface or edge of the said
beam H. I have shown in the accompanying drawing the said beam H as provided
in its lower surface with a separate cam block H³ bolted to that part of the beam which
comes in contact with the roller J2, the purpose of said block being to take the wear
from the edge of the beam. Said cam block will commonly be made of harder
metal than the beam and it may be removed and replaced by a new one when worn to
such an extent as to interfere with the accurate movements of the parts. J³ J³ are
arms or prongs attached to the said arms J¹ J¹ and extending upwardly at the rear of
the pin H¹, and jj (Figures 15 and 16) are two stops upon the arms J¹ adapted to
engage a pin or lug¹ upon the hub at of the frame. The stops jj limit the forward
movement of the arms J J while the prongs J3 J3 serve by engagement with the
pin H', to ensure the throwing of said arms backwardly or to the rearward limit of
their movement and in position for engagement with the said pin H', after the latter
has been moved so as to become disengaged from the arms, in the manner herein-
after set forth.
The rocking arms J1 J1 and the roller J2 engage the beam H as the latter is
moved in the turning of the crank-shaft, and serve as fulcrums or point of support
for the beam, so that the latter operates as it is moved by the crank-shaft to raise
and lower the toggle arms, the slide-bars, the upper and lower cross-head, and
plungers.
A vertical movement is thus given to the upper and lower plungers for discharging
the brick from the mold and for moving the brick within the mold to smooth and
polish the edges of the brick during the compression of the same, and to enable the
clay to be fed to the molds, as will hereinafter more fully appear. The parts thus
arranged to form a fulcrum for the beam H are liable to be subjected to a very heavy
strain, in lifting the plungers within the molds at the time the compression of the
brick is taking place, and in order to give suitable strength and rigidity to the frame
and to transmit a part of the strain directly to the mold-table, vertical inwardly
extending flanges as a are cast upon the frame standards in position to extend from
the hubs at a, downwardly to points above the table. The said hubs are desirably
extended inwardly from the frame-plates, and the flanges a³ a³ are arranged to sustain
the inner ends of said hubs as well as to give rigidity to the frame, (Figures 15
and 16).
As an additional and further means of giving rigidity to the frame to withstand
the downward strain brought upon the pin J in lifting the plungers in the mold, I
place a sleeve Je about the pin J between the hubs a a of the frame, the ends of
said sleeve being placed in contact with the inner ends of the hub, and 1 extend the
ends of said pin outside of the frame-plates and place upon the ends thereof
nuts in bearing against washers which overlap the adjacent outer
surfaces of the frame-plates. It is entirely obvious that when a heavy downward
strain is brought upon the middle of the pin J the effect will be to depress the middle
part of the pin, thereby drawing together the hubs. The presence of the sleeve Je
between the hubs will obviously prevent any springing of the side plates under a
strain of the character described. Said sleeve, furthermore, gives additional stiffness
to the pin between the hubs and also affords a bearing surface to the arms J³ and
roller J³, so that the wear of the same will not come directly upon the pin but comes
upon the said sleeve, which latter may be easily and cheaply renewed in case its
surface becomes too much worn for further use.
K is a heavy drive wheel affixed to the shaft I outside of the frame-plate A. Said
drive wheel is provided with peripheral cogs which engage a pinion K' mounted upon
a stud K² located at the rear part of the frame, said stud having upon it a belt
pulley K³ over which may be placed a driving belt for transmitting power to the
machine.

page_text: L is a sliding feed-box which rests and slides upon the top of the mold table B³
at the rear side of the molds. Said feed box consists of a horizontal plate or
casting provided at its end adjacent to the molds with rectangular openings L¹ L'
corresponding in horizontal dimensions and in number with the molds CC. The
openings L' L' are closed at their bottoms by the mold table upon which the
feed box rests, except when the feed box is moved forward to bring said openings over
the molds. Upon the surface of the mold table, at either side of the feed box, is
formed two outwardly and downwardly inclined or beveled surfaces 6* 6* the upper
edges of which are in vertical alignment with the outer surfaces of the side walls of
the feed box. The mold table is herein shown as provided with grooves or
depressions exterior to said beveled surfaces 64 64, but said table may be otherwise
constructed to afford said beveled surfaces as may be found convenient or desirable.
The space between said beveled surfaces, however, forms in effect, a flat surface
elevated above the adjacent parts of the mold table. The said beveled surfaces 64 64
are extended from the rear end of the mold table to a point somewhat forward of
the front edges of the molds. At each side of the feed box is located a vertical
plate L³ the lower edge of which is beveled and fits against the beveled surface &*
of the table. Said plates L2 are made vertically adjustable upon the feed box, and
for this purpose are herein shown as attached to the sides of the box by means of
bolts passing through vertical slots in the plates. As a means of more positively
holding the plates L² from vertical movement, and for more accurately adjusting
the same, vertically arranged set-screws 12 having squared heads are inserted in over-
hanging flanges L³ at the upper edges of the feed box, in such position as to bear
at their lower ends against the upper edges of the plates L2 L2. By adjusting said
set-screws 12 12 up and down the plates L² may be made to bear with greater or less
pressure upon the oblique bearing surfaces 64 64 as may be found convenient or
desirable. In practice the said plates L² L³ will be forced downwardly to such an
extent as to lift the feed box very slightly above its seat, so that the weight of the
box will come upon the said plates and the oblique bearing surfaces.
In the use
of a feed box resting upon the horizontal top surface of the feed table it is found
almost impossible to retain the feed box in bearing contact with the table owing to the
accumulation of clay between the bearing surface, which clay firmly adheres thereto,
and as it accumulates gradually raises the feed box from its natural position. In
the use of beveled surfaces such as are here illustrated, any clay getting between the
oblique bearing surfaces and the edges of the plates L2 L2 will be scraped or
rubbed from the bearing surface by the latter and will fall or slide downwardly
away from the upper part of said oblique bearing surface, so that the latter will
always remain clear, and in condition to allow the smooth and accurate action of
the feed-box.
M is a stationary feed hopper located over the sliding feed-box L at a point
adjacent to the upper plungers D. Said hopper is herein shown as sustained by
means of lugs m m upon the sides of the hopper which are bolted to the vertical
flanges as a of the frame standards A2 A². Said hopper is fitted closely at its lower
edges to the horizontal top surface of the feed box, in a manner heretofore common.
Said feed box L has a horizontal reciprocatory motion through a distance sufficient
to carry the openings L' L' over the molds C C and under the feed hopper.
When beneath the hopper the feed box receives material from the same and such
material is discharged into the molds when the feed box is moved forward. At the
rear of the receptacle L L¹ the feed box is provided with a smooth horizontal top
surface L (Figures 3 and 10) which extends the full width of the feed box and is
somewhat longer than the distance through which the latter travels in operation.
Said surface L is for the purpose of supporting material within the hopper during
the time the feed box is being moved forwardly to carry the clay to the molds. For
the purpose of keeping clean the top surface Lt of said feed box, I attach to the rear
margin of the hopper M a scraper M¹ consisting of a strip of thin, flexible sheet metal
secured to the vertical face of the hopper by screws m¹ m', or otherwise, and
bearing at an angle at its free edge against the top surface of the feed box. A

page_text: scraper thus arranged acts with a constant pressure and will tend to remain sharp by
reason of the wearing away of its edge in contact with the surface of the feed
box. I have shown a similar scraper L as applied to the rear edge of the feed box
and as bearing upon the top surface of the mold table for the purpose of keeping the
latter clean. Said scraper L³ is shown as attached to the feed box by means of
screws in the same manner as before described in connection with the scraper M¹.
Means is provided for giving reciprocatory motion to the feed-box in the machine
illustrated as follows: N is a rock-shaft mounted at its ends in the frame-plates A A
and provided with an upwardly extending arm N' which engages the cam K* upon
the drive wheel K, and with two depending arms N2 N2 which are connected by
pitmen N3 N³ with the opposite sides of the feed box, in the manner clearly shown in
the drawing, Figures 2 and 3. The cam K is a grooved cam adapted to engage a
roller n upon the arm N¹ and is so shaped as to advance the feed box over the molds
at the time the upper plunger is lifted above the same, as will hereinafter more fully
appear.
The operation of the main parts of the machine constructed as above described is as
follows: The clay is fed to the hopper M. through tubes M2 preferably in a slightly
moist and pulverulent condition. The clay from within the said hopper fills the
recesses of the feed-box when the latter is at the rearward limit of its movement and
is carried forward by said feed-box and deposited in the molds. At the time the feed
box moves forward to fill the molds the upper plungers are lifted to a point above the
top surface of the feed box so as to allow the latter to pass beneath said plungers.
After the clay has been deposited in the molds the feed box is retracted by the action
of the cani K and the plungers D and E are then brought toward each other within
the molds for compressing the brick.
The compression of the brick is produced solely by the action of the toggle arms
operating through the medium of the slide bars F F and the upper and lower cross-
heads D¹ and E³. The vertical position of the plungers within the molds at the time
of compressing the brick is, however, determined by the action of the beam H,
rocking arms J J and roller J2, the weight of the cross-heads, toggle arms and
connected parts being sustained by the said beam, rocking arms and roller during this
operation. I have so constructed the said parts in the particular machine shown that
the greatest compression of the brick takes place at or near the middle of the molds
and during the time both sets of plungers are moving upwardly therein. After the
brick has been compressed the plungers D and E are separated by the reverse move-
ment of the toggle arms, while the lower plunger is lifted by the action of the beam,
the crank, and rocking arms so as to force the finished brick upwardly out of the
molds. The compressed brick are thrust from their position upon the tops of the
lower plungers by the action of the forward edge or end surface of the feed box as it
advances to fill the molds, such advance movement of the feed box for this purpose
being timed to take place before the lower plungers descend.
A brick having a much more uniformly smooth surface at its side edges and ends is
produced when the clay is moved bodily within the mold during the time that com-
pression is taking place, it being a well known fact that if the clay remains stationary
and the plungers advance at equal speed toward each other, the brick will have a
rough or granulated appearance at a line along the middle of the edge and end of the
brick. I have so constructed the parts of the machine shown, therefore, that the
plungers are moved within the mold during the process of compression, so that
the clay at the edges of the brick is carried along the side walls of the mold which
act thereon with a smoothing or slicking action. To produce a movement of
the plungers in the manner stated I so arrange the actuating devices that the upper
plunger first moves downwardly from its position when the mold is filled with clay,
until it enters the mold, so that the clay is brought under considerable pressure before
the beginning of the upward movement of both plungers and subjected to the greatest
pressure while both plungers are moving upwardly through the molds.
It follows from this mode of operation of the parts that the clay which is to form
the side edges and ends of the brick is moved bodily upward along the side walls of

page_text: the mold during the entire time that compression is taking place, with the result of
smoothing the surface of the brick, in the manner above stated. It has been proposed
heretofore to give vertical movement to the plungers of a brick machine by means of
connecting rods or beams connecting the toggles with a crank-shaft, which connecting
rods or beams are arranged to bear upon rollers forming fulcrums by which the lifting
is accomplished. I have found, however, that the power required to move the
plungers within the mold at the time the brick is under compression is very great,
and in the use of roller fulcrums such as are above described the strain upon the
beam and rollers is so great as to produce much friction and cause rapid wearing away
of the rollers and of the surface of the beam in bearing therewith. The rocking
arms J are intended to take from the roller J' the pressure of the beam at the time
when the brick is being subjected to pressure, the said arms J¹ being made of such
length to sustain the beam clear of the roller J2 during the time mentioned. After
the plungers have separated to release the pressure upon the brick, however, the
upward bodily movement of the plungers and connected parts for the full discharge
of the brick may be accomplished by engagement of the roller J2 with the beam. The
arms J, or equivalent depending arms or links hereinafter described, may be so
arranged as to engage and sustain the beam H through a greater or less portion of
its horizontal movement, as desired, and in some instances it may be found convenient
to dispense with the roller J and produce the required vertical movement of the
plungers and connected parts solely by the action of the rocking arm or link. A
construction of this latter kind is illustrated in connection with a suspended link in
Figure 13 of the drawing.
The operation of the beam, rocking arms and roller in lifting the plungers may be
more readily understood by reference to Figures 3 and 11. In Figure 3 the parts are
shown with the plungers at the point of greatest compression and moving upwardly,
the beam H being at the farthest limit of its throw away from the toggles and the
toggle arms in alignment with each other. The downward movement of the crank
pin 1', as indicated by the arrow in Figure 3, is obviously acting to lift the toggles,
plungers and connected parts, the beam at this time being supported by the engage-
ment of the pin H' with the rocking arms J. By reason of the pressure upon the
brick the plungers can be moved upwardly at this time only by the exertion of a con-
siderable degree of force, but a sufficient amount of power is clearly provided for by
the leverage exerted by the beam H as the latter is turned about the pivot ', while
the heavy downward pressure of the beam is transmitted to the frame through the
medium of the rocking arms J' and shaft J. The required rigidity in the frame to
sustain the strain upon the parts at this time is further provided for by means of the
vertical ribs as a which extend from the hubs at a supporting the rock shaft J,
downwardly to the mold table B, in the manner hereinbefore stated.
As the move-
ments of the parts are continued past the position shown in Figure 3 the upper and
lower plungers will be lifted by the upward movement of the end of the beam
engaging the toggles while at the same time said plungers will be separated under
the horizontal movement of the beam in a direction to flex said toggles; the
position of the parts when the crank arm has moved through about sixty degrees from
its horizontal position being shown in full lines in Figure 11. At this time the
plungers will have been considerably elevated and the lower plunger will be near
the top of the mold while the roller J2 has come in contact with the lower surface
of the beam, and the pin H¹ is about to leave or become disengaged from the
rocking arms J. After the parts have passed the position shown in full lines in
Figure 11 there will be comparatively little resistance to the upward movement of
the plungers excepting that due to the weight of the parts. The position of the
said parts when the beam H is at the extreme limit of its throw toward the toggles
is shown in dotted lines in Figure 11, the toggles in this position of the parts being
flexed to the greatest extent and the upper plunger lifted sufficiently above the
mold table to allow the passage beneath it of the feed box. The lower plungers
must necessarily remain for some time at the level of the top of the mold table in
order to allow the finished brick to be thrust therefrom, and, inasmuch as the position

page_text: of said lower plungers during this time will be determined by the action of the
roller J upon the lower surface of the beam H, said lower surface of the beam is
accurately shaped to give such motion to the outer end of the beam as will sustain
the lower plunger immovable with its top surface flush with the top of the mold
table for a required time. In case the lower plungers are supported by springs or
yielding supports, in the manner hereinafter described, however, such accurate
formation of the lower edge of the beam will not be necessary. As will readily be
seen from the dotted lines in Figure 11, the pin H¹ of the beam leaves the rocking
arms J J and moves away from the same when the beam is sustained upon the
roller J², so that the prong J³ applied to the arm J¹, in the manner before described,
will at this time act to throw said arms J¹ backwardly to the position illustrated in
Figure 3. During the rearward or return stroke of the beam H, by which the com-
pression of the brick is effected, the end of said beam which is engaged with the
crank-pin I will be elevated above the crank shaft while the weight of the upper and
lower cross-heads and plungers, together with the slide-bars and toggles, will be
sustained by engagement of the lower cross-head E with the frame or a stop thereon..
In such backward movement of the beam, therefore, the latter will be sustained by
the lower cross-head, slide-bars and toggles at one end, and by the crank-pin at its
opposite end in such position that the beam will remain disengaged from the
roller J2 and rocking arms J'. As the crank-pin descends into the position shown
in Figure 3 at the backward limit of the throw of the beam, however, the pin H³
will engage the rocking arms J1 J1 before the beam reaches its horizontal position,
so that the beam will begin to act to raise the lower plunger shortly before the point
of greatest compression is reached. The brick thus undergoes compression while it
is moving upwardly in the mold, as hereinbefore stated. It is to be understood,
however, that the point of compression may be reached before the lower plunger
begins to move upwardly from the bottom of the mold, or, after it has moved
upwardly some distance therein, the point at which the greatest compression is
reached obviously depending upon the length of the beam H and the relative location
of the several pivotal connections between the parts.
In Figure 13 I have illustrated a construction hereinbefore referred to, in which
depending pivoted arms or links are used in place of the rocking arms J¹ J. In
this instance J* is a heavy shaft or pin supported in the frame-plates A at opposite
sides of the machine and extending over the beam H. J' J' are heavy depending
pivoted arms or links engaged with the said shaft or pin J and with the pin H¹ of
the beam H. Said links J J obviously afford a moving or swinging fulcrum for
the beam H as the latter is moved longitudinally for actuating the toggles. The said
links are shown as arranged to sustain the beam throughout the entire length of its
throw. When this construction is used, however, it will commonly be necessary to
provide a movable connection between the lower plungers and the parts by which
they are directly actuated, such for instance as that hereinafter described, so that said
lower plungers may remain flush with the mold table during the time that the bricks
are being moved therefrom. In some instances, however, the pivotal connections of
the links may be so disposed as to give such motion to the parts that the lower
plungers will be sustained therefrom at the level of the mold table a sufficient length
of time to allow the bricks to be removed.
The machine shown in the drawings embraces, as a separate and further improve
ment, certain novel features of construction in the means connecting the lower
plungers with the parts by which the same are actuated, as follows:
The said lower plungers E instead of being positively or rigidly attached to the
lower cross-head E¹, are vertically movable with relation to said lower cross-head, and
said plungers are sustained from the ground, or from the frame of the machine, inde-
pendently of the cross-head, by means of a spring or springs or counterbalance weight
or weights, so that said lower plungers may in certain positions of the lower cross-head
be adjusted vertically. within the mold independently of the cross-head, the said
plungers however being provided with surfaces or shoulders adapted to engage the
cross-head at certain points. of its movement, so that the plungers will be forcibly and

page_text: positively lifted in the compression of the brick. In the specific form. of these parts
shown in Figures 1, 3, 6, 7 and 8 the plungers E are provided with vertical,
depending stems E' which pass through centrally arranged apertures in the upper part
of the cross-head E' which, in this instance, is made hollow or of inverted "U" shape
in cross section. At its lower end the stem E2 is held and guided in a vertical,
tubular guide 0 attached to and supported upon the frame base A¹. At a short
distance below the plunger proper the stem E2 is provided with a shoulder e¹. Around
the upper part of the said stem E2, and below the shoulder e' is placed a sleeve 01
provided at its top with a hand wheel O2 and at its lower part with screw-threads o.
Upon the screw-threaded lower end of the sleeve is placed a ring or collar 03 which
is held from turning with the sleeve by flat faces upon the collar engaging the side
walls of the cross-head. 0' is a spiral spring placed around the stem E² bearing at
its upper end against the under surface of the collar 03 and at its lower end against a
stationary.surface or shoulder, herein shown as formed upon a flange o' of the tubular
guide O. At its upper end the sleeve O is provided. with an outwardly extending
flange or collar o² constructed to engage the top surface of the cross-head E¹. .05 is
a ring or collar rigidly attached to the stem E2 in contact with the lower end of the
sleeve O¹. These parts are so arranged that the lower plunger may either be sus-
tained by engagement of the shoulder with the top of the sleeve at the time when
the flange o² rests upon the top of the cross-head, as illustrated in Figures 3 and 6, or by
means of the spring O at the time when the cross-head is free from the said. flange o³,
as illustrated in Figure 7. The said spring 04 is of such strength that it will
.sustain the plunger, and the sleeve at times when there is no pressure upon the plunger,
and the parts are so disposed that when the cross-head is at the lower limit of its
movement. said cross-head will be free from the flange o² and the lower plunger will
be held up by the spring, so as to bring the collar 06 in contact with the under
surface of the cross-head,.whereby the position of the plunger within the mold at the
time of filling the same is positively determined. It follows, that when the lower
cross-head is at the lowermost limit of its movement. the lower plunger will stand
above the bottom of the mold. and will be supported in such position by the spring,
and the purpose of the screw.connection between the sleeve 01 and the collar E³,
which immediately engages the spring, is to enable the said sleeve to be vertically
adjusted in the collar for the purpose of adjusting the vertical, position of the plunger
within the mold at the time of filling the same. Such position of the plunger
obviously determines the amount of clay which is fed to the mold by the feed box. It
follows that by turning the said sleeve at a time when the. lower cross-head is
depressed the lower plunger may be adjusted in the anold to give any quantity of clay
as found desirable or necessary for making bricks. of suitable size according to the
quantity and condition of the clay and other circumstances. The accurate adjustment
of the lower plunger. will obviously be independent of the tension of the spring,
tinasmuch as the spring, will. be compressed to a considerable extent at the time the
lower cross-head is.at the lower limit of its movement and in bearing against..the
collar 0³, as clearly shown in Figure 7.
+
.
+
"
i
When the upper plunger descends into the mold after the latter has been filled with
clay, the approach of the upper plunger toward the lower plunger will cause the said
lower plunger to recede, the same being sustained at this time solely by the spring O*.
The position of the parts after the upper plunger has entered the mold is clearly shown
in Figure 7. In the downward movement. of: the upper plunger the clay will of
course be compacted to a greater or less extent owing to the tension of the spring.
The downward movement of the lower plunger as the upper plunger descends will
continue until the shoulder e' strikes.the sleeve Owhen said, plunger will come to a
firm.and unyielding bearing on the lower. cross-head..and its further downward move-
ment will be arrested. The plunger is desirably arranged to stop.at a. point near, the
bottom of the mold, as clearly shown in Figure 8. The collar 10 serves to prevent
the descent of the sleeve O without the plunger.and stem. in case the plunger sticks
in the upper part of the mold.
The upward movement of the lower cross-head; for the purpose of compressing the

page_text: brick, will preferably begin at about the time the said lower plunger has come to
bearing upon the lower cross-head, the time at which the plungers begin their
upward movement obviously depending, in the machine illustrated, upon the location
of the rocking arms J' and the pin H' of the beam H, as herein before described.
The lower plunger will obviously be lifted so as to bring its upper surface flush with
the top of the mold table by the action of the lower cross-head, and the spring 04
may be of such length that the collar 03 will be lifted free from the spring at this
time. In case this construction is used, or in case the spring, while of sufficient
length to remain in engagement with the collar O³, is too weak to sustain the weight
of the upper plunger when the latter is at the upward limit of its movement, the
movement of the lower cross-bead must be so controlled by the shape of the lower
edge of the beam H, or otherwise, that the said lower plunger will be held immovable
in the upper part of the mold while the brick is being removed therefrom. Desirably,
however, the spring O* is made of sufficient strength to sustain the lower plunger
when the latter is at the upward limit of its movement, and in such case a stop e² is
placed on the stem E2 below the mold table and above the shoulder e' in such position
as to engage the lower surface of the table or other stationary stop or projection upon
the frame when the lower plunger is flush with the top surface of the table. Such
stop is obviously necessary in order to prevent the spring from throwing the lower
plunger above the surface of the table, the collar O³ at the time the lower cross-head
is elevated obviously being free from the same so as to present no obstacle to the
further upward movement of the lower plunger, as will be clearly seen from an inspection
of Figure 6. When the spring is arranged to support the lower plunger level with
the top of the table, and a stop is employed to hold the plunger in this position it is
obviously not essential that the lower cross-head should remain immovable at the
upward limit of its movement for any considerable length of time, or even that the
said cross-head should lift the lower plunger the full length of its throw, inasmuch as
the spring and stop will sustain the lower plunger at the upward limit of its movement
while the brick is being removed from the plunger even though the lower cross-bead
begins immediately to descend, and the spring may be of sufficient strength to lift
the lower plunger and the brick after the brick has been pushed nearly out of the
mold. It follows that by the use of the spring and stop constructed to sustain
the lower plunger at the top of the molds, any special construction in the actuating
devices of the machine for holding the lower plungers immovable, such for instance
as the cam surface upon the lower edge of the beam H, herein before referred to, may
be omitted. In the use of a spring and stop thus arranged, therefore, depending
pivoted arms or links Jo Jo may be employed as the sole means of sustaining the
toggle actuating beam H and the roller J' may be dispensed with, as hereinbefore
described in connection with Figure 13 of the drawing. The employment of a spring
or its equivalent and a stop arranged to support the lower plunger or plungers, in the
manner above stated, is therefore of great importance in a machine of the character
herein shown, for the reason that it renders unnecessary a careful construction and
adjustment of the parts to give the exact movement and dwell required for the lower
plungers, while at the same time the life of the machine is increased inasmuch as the
wearing of the parts or bearing surfaces by which motion given to the lower plungers
will not prevent the successful operation of the machine, as will obviously occur in
cases where the position of the lower plungers with relation to the table depends
solely upon the accuracy of the adjustment and form of the working parts, such for
instance as the cam surface of the beam H and the roller J*.
One important advantage gained by the employment of a spring or yielding support
for the lower plungers arises, however, from the fact that the said plungers are
the molds without in any way interfering with or requiring any adjue machines as
thereby rendered adjustable for the purpose of giving a large or small capacity to
adjustment of the
cross-heads by which said plungers are immediately actuated.
heretofore made the descent of the lower plungers has been limited by adjustable stops
placed upon the frame in position to engage the lower cross-head. In such prior
constructions it has been found difficult to accurately adjust the stops as the stops

page_text: become rapidly worn by the constant and forcible contact of the lower cross-head
therewith, so that they can seldom be retained in adjustment for any considerable
length of time. In a machine constructed as herein proposed, on the contrary, the
vertical position of the lower cross-head when at the lowermost limit of its movement,
may be varied considerably without interfering with the proper operation of the parts,
so that no accurately adjusted stops are required to limit the downward motion of the
lower cross-head, and elastic stops or cushions may be arranged to receive the impact
of the said lower cross-head, if desired. In such prior construction, furthermore, it
is obviously impossible to provide for a vertical movement of both plungers first
downwardly and then upwardly within the molds as occurs in the operation of the
machine described, it being entirely obvious that the upward movement of both
plungers during the time compression is taking place, which movement begins when
the lower plunger is at the bottom of the mold, is highly advantageous for smoothing
the edges and ends of the brick, in the manner hereinbefore stated.
In carrying out that part of my invention which relates to the construction and
actuation of the lower plungers, said plungers may obviously be supported by a
yielding or adjustable support with the use of devices differing materially from the
particular ones above described. As for instance, it will be readily seen that a
counterbalance weight may be applied in place of the springs for lifting the lower
plungers. A construction of this kind is shown in Figure 14. In this instance the
lower plunger E is immediately sustained by a standard P the lower surface of which
is adapted to rest upon the top of the cross-head E¹. P' is a horizontally arranged lever
having a forked end p adapted for engagement with lugs or projections plat opposite
sides of the standard P. The said lever P¹ is pivoted at p² to a suitable stationary
support, and upon its end remote from the plunger is placed a weight P2 of such size
as to counterbalance the weight of the lower plunger and the parts immediately
connected therewith. An adjustable stop p³ may be employed to limit the downward
movement of the lever so as to arrest the lower plunger when it reaches the top of
the mold. Vertically arranged bolts P³ ³ inserted through the lower part of the
standard P and through the cross-head E¹, said bolts being provided at their end:
with heads p, may be employed as a connection between the lower cross-head and
plunger for the purpose of drawing the latter downwardly against the action of the
weighted lever and for retaining the said plunger in position for the insertion of clay
within the mold, as herein before described.
The springs or weights employed to lift the lower plungers obviously counter-
balance, to some extent, the weight of the cross-heads and connecting parts, and at
the same time aid in foreing the brick from the mold, thereby lessening the power
required to be exerted by the actuating devices when the plungers are being lifted.
. Referring to the construction shown in Figures 3, 6, 7 and 8, the sleeve O¹ is
desirably fitted loosely about the stem E2 so that said stem is not held from lateral
movement by engagement with said sleeve but is sustained and guided solely by
engagement with the interior of the mold and with the tubular guide O. The sleeve O¹
may also be desirably fitted somewhat loosely in the cross-head E'. By so constructing
these parts that they do not bear laterally upon or against the stem E², I gain the
advantage of making the movement of the lower plungers entirely independent of
lateral movement or shifting of the cross-head. In other words the lower plunger
will remain perfectiy true and will move vertically within the mold and retain its
horizontal position while in action notwithstanding any lateral shifting or movement
of the cross-head which may take place by reason of the heavy strain thereon or by
reason of the slight wearing of the slide bar guides or other parts, it being of course
understood that the direct upward or downward pressure coming upon the horizontal
engaging surfaces of the said stem, of the sleeve O₁ and the cross-head will have no
tendency to move the plunger or stem laterally. By reason of the advantage gained
by the particular construction set forth, the features whereby the lower plunger is
held in position independently of the lower cross-head, as above set forth, are herein
claimed as part of my invention.

page_text: "
The machine herein illustrated is what is known as a two mold" machine but the
frame is made of such width as to allow the use of three or four molds and plungers
in place of those illustrated.
Next describing the construction of the mold table as illustrated in Figures 17
to 24 which we prefer to that herein before briefly set forth, in Figures 17, 18, 19, 20,
21 and 24; the inolds CC are provided with side lining plates c c and end lining'
plates cc, the end lining plates being extended past the ends the side lining plates
so that all the lining plates are beld in position by the clamping action of the horizontal
bolts bb by which the two castings B1 B2 are held together. In the case of a machine
having one or two molds the molds will commonly be located at such distance apart
as to enable the castings B' B2 to be made with projecting parts B3 B3 which enter
Fetween the molds and meet at the center line of the table, horizontal bolts bb being
inserted between the molds, as shown in Figure 12, hereinbefore referred to, and in
Figure 24. In a narrower machine, or a machine having three or four molds or more,
the molds are placed closer together, but when the molds are thus placed close together
it has been found difficult in constructions heretofore employed, to properly bolt to
each other the parallel castings B₁ B2 forming the main parts of the molds by reason
of the narrow spaces between the latter. To avoid this difficulty the molds, as ilus-
trated in Figures 17 to 21 inclusive, are divided by transverse partitions G G the ends
of which engage the castings B1 B2 which, in this instance, are arranged to come in
contact with each other only at their end portions, adjacent to the sides of the machine.
Said partitions G G are provided at their ends with cylindric stems or prolongations G¹
(Figure 21) adapted to extend through opposite apertures in the castings B1 B2, said
cylindric prolongations being screw-threaded and provided with nuts upon their outer
ends, or having other holding devices engaged with the said castings, to hold the
latter from spreading apart. When this construction is employed the stems G' G¹ can
be made of a diameter equal to or greater than the thickness of the partitions, so that
a suitably strong connection may be provided without decreasing the strength of the
partitions. It will of course be seen that by this construction the machine may be
made narrow with the same number of molds or a greater number of molds
may be placed in a machine of the same width than would be possible by the use of
partitions having tie-bolts passing through them, it being obvious that the partitions
would have to be of considerable thickness to allow the passage of separate liorizontal
tie-bolts through them while at the same time giving sufficient strength in the partitions
themselves.
As illustrated in Figures 17 to 21 the molds are provided with lining plates c c c¹ cl
upon all of their four sides, the side lining plates of the adjacent molds being located
at opposite sides of the partitions G. We have, however, shown in Figures 22 and 23
a construction in the molds wherein partitions G2 G² themselves form the sides of the
molds while end lining plates c² ² are placed across the ends of the molds between said
partitions and are held in place by engagement with the rabbeted edges of the par-
titions. When the parts are thus constructed the partitions will of course be made of
metal sufficiently hard to afford suitable wearing surfaces for the molds.
A construction of the lining plates in which the end lining plates, or those plates
which are parallel with the front and rear edges of said castings, has the important
advantage that when the two castings forming the mold table are drawn together by
the horizontal bolts bb and by the nuts upon the stems of the partitions GG, when
the latter are present, the said plates, which are parallel to the sides of the castings,
are drawn or forced into close contact with the end surfaces of the two other lining
plates, thereby enabling tight joints to be easily made and maintained at the corners
of the mold. This same general feature of construction and the advantages arising
therefrom is present in the molds constructed as shown in Figures 22 and 23 wherein
the end lining plates c2 c2 are fitted in rabbets in the partitions G2 G2 and may thus
be brought to a firm and close bearing against the faces of the rabbets when the nuts
are tightened upon the stems G3 G3 of said partitions:
In the employment of a two-part mold table the end lining plates which overlap the

page_text: ends of the side lining plates, in the manner above described, the lining plates may be
easily removed from the molds by loosening up the bolts and the nuts upon the
stems of the partitions, when the latter is present. It is obviously desirable, however,
that some means should be provided for moving apart or separating the two
castings B1 B2 after the bolts have been loosened up. in order, however, to provide
for a bodily movement of the casting B' for the purpose described, we provide. a
screw, wedge or other equivalent device adapted to act upon said plate B¹ in such
manner as to shift or move the same outward from its position against the casting B².
As a simple and convenient construction for this purpose said plate B' is herein
shown in Figures 17, 18, 19 and 20 as provided with set-screws H H which pass
through said casting B' and abut against the inner surface of the casting B2. Said
but.
set screws H H are herein shown as located between the molds and the bars F F,
they may be otherwise placed as found convenient or desirable.
To enable the part B1 of the table to be moved outwardly, in the manner described,
we make the bolt holes in the vertical en flanges 6262 larger than the bolts, or slotted
or of elongated form, as illustrated (Figure 20), it being of course necessary to loosen
up the bolts 66 which pass through said flanges before the casting can be moved.
It will of course be understood that the construction in the mold table and molds
above described may be employed as well in cases where the mold table is without the
vertical webs B B extending downward to the bottom of the machine frame as when
such webs are present.
When such webs are employed, however, we make the bolt
holes in the same, through which the bolts which secure said flanges to the side
frame plates and frame base, of elongated form to allow the casting B₁ to be shifted
bodily forward, in the manner above described.
In Figure 24 we have shown, in connection with a mold-table of the form illustrated.
in Figure 12, wedges applied to separate the castings B1 B2 for taking out the lining.
plates, in place of the set screws H above described. In this instance II are wedges
inserted between the end of the castings B2 and inclined or wedged surfaces ii at the
end of the casting B¹, set screws I' I inserted through brackets on the frame
being arranged to engage the said wedges to thrust the latter inwardly.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is :
1 The combination with a mold, and opposing plungers working therein, of
toggle-arms connected with the opposite plungers, a crank-shaft, a beam connected
with the crank of said crank-shaft and with the middle joint of the toggle-arms,
and a rocking support for the beam pivoted at one end upon the frame and engaged
at its other end with the said beam, substantially as described
2: The combination with a mold, and upper and lower plungers working therein,
of upper and lower cross-heads connected with the, said plungers, vertical bars
attached to the lower cross-head, toggle-arms connected with the said bars and the
upper plunger, a crank-shaft, a beam connecting the middle joint of the toggle-arms
with said erank-shaft, and a support for the beam pivoted at one end to the frame
and engaged at its opposite end with the said beam, substantially as described.
3: The combination with a mold, and opposing plungers working therein, of
toggle-arms connected with said plungers, a crank-shaft, a beam connected with the
crank of said shaft and with the middle joint of the toggle-arms, a rocking support
sustaining the beam during a part of its throw and a stationary support sustaining
the beam during a succeeding part of its throw, substantially as described.
4: The combination with a mold, and opposing plungers sliding therein, of
toggle-arms connected with said plungers, a crank-shaft, a beam connecting the crank
of said crank-shaft with the middle joint of the toggle-arms, a fixed roller engaging
the beam, and a separate cam-block attached to the lower edge of the beam in position
for contact with the roller, substantially as described.
5: The combination with the mold table, plungers, cross-heads, toggles, crank-
shaft and beam, of side frame-plates provided with inwardly extending hubs a* a*,

page_text: a pin J inserted through the hubs and provided with heads or nuts on its outer
end, a sleeve surrounding said pin between the hubs, and a fulcrum for the beam
supported upon said pin and sleeve, substantially as described.
6: The combination with the vertical side frame-plates, horizontal frame-base,
plungers, and actuating devices for the plungers, of a mold table let in, at its ends,
to the side frame plates and consisting of two parts or castings having the molds
formed between their upper portions and provided with vertical webs extending
downwardly to the frame base, said two parts being bolted to each other and to the
frame-plates by horizontal bolts, and the webs being bolted at their lower edges to the
frame base, substantially as described.
7: The combination with the machine frame, a mold and upper and lower
plungers, of upper and lower cross-heads for actuating the plungers, the lower
plungers being movable relatively to the cross-head, and a yielding support sustaining
the lower plunger whereby the same may be moved independently of the lower
cross-head, substantially as described.
8: The combination with a mold, of upper and lower plungers sliding therein,
cross-heads sustaining the plungers, the lower plunger being vertically movable with
relation to the lower cross-head, a yielding support for the said lower plunger
acting independently of the lower cross-head in certain positions of the latter, and
shoulders or surfaces upon said lower plunger and cross-head, adapted to limit the
relative movement of said parts, substantially as described.
9 The combination with the mold and lower cross-head, of a lower plunger
movable vertically with relation to the cross-head, a yielding support sustaining said
plunger independently of the cross-head, and horizontal surfaces or shoulders upon or
connected with said plunger and acting against the cross-head to limit the movement
of the plunger with relation to the cross-head in both directions, whereby the said
plunger is moved positively by the cross-head during a part of both the upward and
downward movement of the latter, substantially as described.
10 The combination with a mold and a lower cross-head, of a lower plunger
which is movable vertically with relation to the cross-head, and a yielding support
sustaining said plunger independently of the cross-head, said plunger being provided
with a vertically adjustable stop limiting the upward movement of the plunger with
relation to the cross-head, whereby the position of the plunger within the mold at the
time the latter is filled may be regulated as desired, substantially as described.
11 The combination with the mold and lower cross-head of a brick machine, of
a lower plunger provided with a vertical stem passing through the cross-head, and
with a horizontal surface or shoulder engaging the top surface of said cross-head and
a yielding support sustaining said plunger independently of the cross-head,
substantially as described.
12: The combination with the mold and lower cross-head of a lower plunger
provided with a vertical stem passing freely through said lower cross-head and
with a horizontal surface or shoulder engaging the top surface of the cross-head, a
yielding support for said plunger, and a stationary guide upon the frame engaging
the said stem, whereby the plunger is guided by the mold and said stationary guide
independently of the cross-head, substantially as described.
'
13 The combination with the mold and lower cross-head, of a lower plunger
provided with a depending vertical stem passing through the cross-head, a sleeve
surrounding said stem and provided with surfaces or shoulders adapted to engage
both the plunger stem and cross-head, a vertically adjustable collar upon said sleeve
and a spring acting with an upward pressure upon said collar, said collar being
adapted for engagement with the lower surface of the cross-head, substantially as
described.
14-The combination with a mold table provided with outwardly bevelled
surfaces, of a feed-box provided at its sides with vertical plates fitting at their lower
edges against said bevelled surfaces, substantially as described.
-
15 The combination with a mold table, provided with outwardly bevelled

page_text: surfaces, of a feed box and a vertically adjustable plate secured to the sides of the
feed box and fitted to slide upon the said bevelled surfaces at their lower edges.
16 A mold table for brick machines comprising two castings, transverse
partitions located between said castings. said partitions being provided with
prolongations or stems passing through the said castings and having nuts or other
fastening devices at their ends exterior to the castings for holding the same together,
substantially as described.
17The combination, with upper and lower plungers and a machine frame
comprising parallel vertical side plates, of a two-part mold table, horizontal bolts
connecting the parts of the table, side and end lining plates for the mold, the end
lining plates being extended at their ends past or over the end surfaces of the side
lining plates, and means for separating the two parts of the mold comprising set-
screws or equivalent devices acting upon one part to thrust it away from the other
part, substantially as described.
Signed at Chicago. Illinois. this 25th day of November A.D. 1889.
0 Witnesses :
BRUCE CLARK WHITE.
JAMES ANGUS BOYD.
Haseltine, Lake & Co.,
45, Southampton Buildings, London, Agents for the Applicant.
C. CLARENCE POOLE.
GEO. W. HIGGINS, Jr.