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Oct. 1, 1946.
' 2,408,488 -
Original Fi‘led June 8, 1939
4 Sheets-Sheet‘ 1
4/ 37
J9 45 //a
oct- 1, 1946.
Original Filed June 8, 1939
4 Sheets-Sheet 2
$1 5%
Oct. 1, 1946.
I 2,408,488
Original Filed June 8, 1939
4 Sheets-Sheet 3
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Oct. 1, 1946.
Original Filed ‘June 8, 19/39
4 Sheets-Sheet 4
A Patented Oct. 1, 1946
Louis N. Sorensen, Port Clinton, Ohio, assignor to
The Celotex Corporation, Chicago, 111., a corpo
ration of Delaware .
Original application June. 8, 1939, Serial No.
278,212. Divided and this application August
27, 1941, Serial No. 408,430
9 Claims.
(Cl. 164-125)
This invention relates to the method of per
forating gypsum lath or the like in the ordinary
course of manufacture and article resulting
therefrom, so that when the finished‘ lath are
delivered from the last or drying operations no
further operation is needed before the lath is
ready for use.
H1 at intervals and lugs M are secured on a
chain 10a at intervals of one foot or any desired
A chain 15 drives sprockets l6 and I‘! to which.
are secured pivotingcrank arms l8 and I9 re
spectively, said crank arms being secured ec
centrically upon the sprockets l6 and I1 which
Heretofore the perforating operation has gen
erally taken place after the lath have come
through the dryer and have been bundled prior
to shipment; the operation has been done by
are secured within a frame 20 on a bearing
mount 2|.
A driven sprocket22 is secured on a shaft‘23
which is driven by means of a chain and clutch
means of gang drills which leave considerable
(not shown) from the main board machine
drive. The chain I5 is mounted on the sprocket
An object of this invention is to provide a per
forated gypsum lath which is free from dust; 15
this is highly desirable as the dust falls into the
of the shaft 23 and has a short crank arm
eyes of the mechanic applying the lath; this par
26 eccentrically secured to the face thereof on
ticularly is true when the ‘lath are being applied
a pivot pin 21, and said arm 26 has a plate 28
to ceiling joists.
Another object of this invention is to provide 20 secured thereon at its opposite end and a notch
29 therein, thus as the sprocket 22 and wheel
a means whereby the lath to be perforated is
25 revolve with the shaft 23, the short crank
moved forward at intervals or steps to permit
arm 26 moves in an eccentric manner against
the perforating operation while the lath is at
‘face of the wheel 25, pivoting on the pin 21,
rest in the machine during
dust in the packaged lath.
the periods between
and the free end of the arm on which the notched
‘Still another object is to provide a means
plate 28 is secured moves back toward the frame
20 until the revolution of the wheel causes said
the forward steps.
whereby the plugs cut from, the lath‘, may be
removed after the perforation is completed.
arm to again slide forward whereupon the notch
29 therein engages a lug l4 and moves the chain
These and other objects may be seen and noted
from the following speci?cations and its accom
panying illustrations, in which:
Illa forward approximately one foot.
The chain 10a drives a sprocket “A” which
in turn drives a chain Mb which engages the
sprocket “B” causing the chain Ill to move for
ward in steps of one foot or any other prede
' Fig. 2 is an enlarged top plan view of the per
termined distance. Lath are delivered by means
forator partly cut away,
35 of a driven roll lZa to the idler rolls I2 where
Fig. 3 is an enlarged side elevation of the
they are engaged by the bars I3—-one of which
perforating device, partly in section, the cutting
is at each end of the lath to insure its even
position of the knives being indicated by the
travel through the perforator.
Fig. 1 is a side elevation of the device and the
carrier or conveyor upon which the lath moves.
dotted lines.
As the rotation‘of the wheel 25 continues the‘
Fig. 4 is a view similar to Fig. 3 but with the 40
notched end of the arm 26 moves away from the
knives in the retracted position and the slide in
the forward position removing the plugs.
Fig. 5 is an enlarged fragmentary section show
lug l4 and the motion of the chains l0, Illa,
and “lb ceases until the ‘operation is repeated.
This causes an intermittent movement of the
ing one of the knives as the perforation is com
lath 30 as it travels through the perforating
pleted and the plug thrust within the throat of 45 machine;
the synchronizing of the retraction of‘
the knife.
the short crank arm 26 with the upward thrust
Fig. 6 is a similar view to Fig. 5 but with the
of the crank wheels [6 and I1 causes the per
knife retracted and the plug about to be pushed
foration of the lath during that‘interval when
from the top of the rod.
the chain Ill carrying the lath 30 through the
Again referring to the drawings a chain It] is 50 perforator,
is not moving forward. I
mounted over rolls H as illustrated in Fig. 1;
crank rods l8 and I9 are pivotally
adjacent a conveyor of which the driven rolls
attached at the top thereof to a plate 3| through
l2a are a part; the idler rolls I 2 serve to sup
bearings 32. Rollers 33 mounted on bars 34 move
port the lath on its journey through the per
up and down on the frame 20 and keep the per-J
forator. Cross bars l3 are secured on the chain 55 forating machine in a vertical plane.
thrust forward to a vertical position as shown in
Fig. a and the slide is thus drawn forward, the
cross bars 68 brushing the circular plugs 55 from
with a ?xed die plate 31 secured to the frame
the rods 44.
20 thereabove, the sleeves 39 being secured to
When the pressure is released on the nut 55, by
the plate 3! by bolts .35.
the perforating mechanism again moving up
The rods 35 pass through bearing sleeves 35
ward, the weight (it pulls the'rod 59 downward to
secured to the top surface of the ?xed die plate
counterbalance the balancing lever 58 and the
31 by bolts 49, and oil cups 4! lubricate the
slide 66 moves back to its original position with
sliding bearing sleeve 36.
the cross bars out of, the path of the knives 43.
Secured rigidly to the plate 3! through sleeves
Rails 69 secured to the frame 20 by any suit
42 are circular perforating knives '23, and said
able means such as an angular plate 69a, as
knives are fastened to the plate 3! by means of
shown in Fig. 3, apertures 691) being provided
a bolt "H and lock nuts 12. The bolt ‘all passes
therein to allow the passage of the knives G3
through the plate "iii to which the knife is weld
I therethrough support the lath 39 in the perfo
ed, and engages in the bottom of theknife plate
‘ rator.
3|. The circular knives slide up and‘ down on
The operation is evident from the above de
stationary rods 64 secured to a ?xed plate 1%5 se
scription but may be briefly stated as follows:
cured to the frame Eli.
The laths or pieces of plaster board 39 are ad
The die plate 37 has apertures 4E therethrough
vanced step by step through the perforating ma
directly above the knives 523 and registering there 20 chine. When the feed is stopped the sliding plate
with. Plugs Ill extend into the apertures 46 and
3!, operated by the connecting rods l8 and I9
are held in place by means of a plate £59 to which
slides up carrying with it the tubular knives 43
they are fastened by means of lock nuts so.
which cut the disks 5| from the lath, as illus
Bolts 59 secured through the plate #39 are screwed
trated in Fig. 5, the plugs 41 acting to force the
into the die plate 3‘? and are retained by lock
cuttings into the bore of the knives or cutters.
nuts 75 asshown in Fig. 4 to secure the plugs it?
When the plate 3i descends the cutters are re
in a set position within the aperture es.
tracted and the ?xed rods M eject the pieces 5!
The apertures ‘it are of such diameter as will
from the knives as shown in Fig. 6, and then by
allow the circular perforating knives £3 to pro
the lever mechanism the frame 66 is shifted lat
ject therein, whereas the plugs M’ are small 30 erally and its bars 68 dislodge thepieces from
enough to ?t within the throat of the knives (i3.
the top of the rods 44, as indicated in Fig. 4.
. Thus’ as the knives $3 pass through the gyp
The operation is then repeatedfor the next rows
sum lath 3B, the circular plug or cutting 5! cut
of perforations, and so on inde?nitely.
therefrom is thrust downward into the throat of
the. knife 43 by the downwardly projecting end 35 in forming my novel perforated lath wherein the
of the plug M as the knife enters the aperture at.
perforations are troweled smooth is to first form
This results in a cleanuniform cut with the edges
the lath on the lath forming machine as at C.
of the hole being smoothed by the troweling ac
The lath after it has been formed is allowed to
tion of the knives as passing through them.
set as it travels on the conveyor l2a. The con
On the downward stroke of the perforating
veyor [2a is of such length that the time it takes
mechanism, the rods Mi thrusting upward through
for the lath to travel from the lath forming ma
the knives 43 as the said knives move downward,
chine to the lath perforating machine, the lath
push the circular plugs 5! out of the throat of
has had time to partially set the cementitious'
Rods 35 mounted on the plate 3| through
sleeves {to serve to keep the plate in alignment
the knives ea.
As the perforating assembly moves downward
A " material forming the inner lamination of the
an extension arm 52, which is slotted at 53 to
encircle a rod 513, strike-s a nut 55 secured on the
end of said rod, which is a part of a lever oper
ating mechanism.
, The rod to is movably secured to one end of -
the balancing lever 56 suspended on a-pivot post
or hearing 5'! mounted on a plate 58 and sus
lath. Where a plurality of rows of lath are si
multaneously formed on the lath forming ma
chine, it is permissible to allow some of the lath
which are not to be perforated to pass on di
rectlyrinto the drier D, while the lath which are
to be perforated are shunted to one side of the
main conveyor E20. to pass through the-lath per
pended within the frame 28 and secured thereto
forating machine. ‘The shunt‘ conveyor system
to the lath perforating machine also permits the
by any suitable means.
lath to set harder so that a better ?nished per~
Movably secured to the opposite end of the ball
foration is had.
The continuous movement of the lath on the
conveyor or shunted conveyor [2a is then trans
formed to an intermittent motion by the conveyor
mounted through the rod 59 above and adjacent
60 ll! of the lath perforating machine. The lath or
ancing lever 55 is a second rod 59, to the lower
end of which is secured a weight 5%. A pivoting
angular lever (ii is secured on a pivot pin 52
to the weight 69,.
The center portion of the pivoting angular lever
BI is pivotally secured on a pin 63 mounted
through a, bearing bracket 64 secured to the
frame 26, the angular leg ?lo projecting down
wardly within an aperture 55 in a slide 65.
_ The slide 6% is slidably secured through split
guides 61 secured to the die plate 31 and project~
plaster board is advanced step-by-step through
the perforating machine. As the lath is ad
vanced, the lath is then perforated during the
period when the intermittently actuated conveyor
i0 is standing still. After the lath leave the per
forating machine, they are transferred from the
‘ intermittently ‘actuated conveyor ‘H! to the con
tinuously moving conveyor I211. The lath then
ing downwardly therefrom, and cross bars 68 are
secured between the side bars of the slide 66;
are. conveyed to. the drier where they are com
thus as the extension arm 52 strikes the nut 55 70 pletely dried. It is obvious from the above dis
on the rod 56!, the balancing lever 56 dips down
closed method of forming a perforated lath, that
ward at that end, causing the rod 59 to move up
a novel lath hasvbeen formed wherein the perfo
ward vertically. this draws the pivoting angular
rations are troweled smooth; and as the lath is
lever 6i upward, the angular leg 6la projecting
dried, a hard smooth surface is formed within the
within the aperture es in the slide 16% isthus
' 2,408,468?
perforations without the‘ attendant ‘dust as'is the
case where the lath-are drilled.
Itv is evident that as'the lath is perforated, it
r This application is a division of application Se
rial No; 278,212 ?led June 8, 1939.
‘ What is claimed is:
is also possible to form means such as partially
1. The method of fabricating a perforated slabv
perforated holes for the reception of nails for U! 2 of-building material comprising a layer of set or:
starting the nails into the lath or plaster board
hardened cementitious material adhered to sur-»
as it is erected. Referring. to Figures, 1 to6in
facing sheets, which‘ comprises the steps : ' forming.
clusive, novel mechanism has been provided to
allowing the slab to partially'set, posi
partially perforate the lath asit travels through
tionin‘g‘a selected portion ofthe slab over a sta
the perforator with intermittent motion. There 101' tionary plug anvil perforating the partially set
has been provided prick punches 13' in the form,
slab, by a reciprocating annular cutter in coop
of'long slender rods pointed on one end and
eration with the plug anvil, and troweling the
a?ixed to the plate 3| in a suitable manner such
partially set cementitious peripheral of the perfo
as tapping the plate 3| and threading the ends
ration causing the. periphery of the perforation to
of the prick punches 13, To look ,the prick
punches in position, lock-nuts 14 have been pro
vided.. The angular plate 69a is provided with V
be smoothed.‘
2. The method of perforating a slab of building
material comprising a layer of set or hardened
apertures 15 to permit the passage of the prick‘
cementitious material adhered to surfacing
punches Has the plate 3! is actuated to perfo
sheets, which comprises as steps: uniformly ad
rate the lath as ‘it travels through the perforator 20? vancing the‘slab, changing the uniform motion
with a step-by-step motion; ‘ It is, therefore, evi-,
of the slab to intermittent motion, and between
dent that as the plate 3! is actuated, the prick
intermittent movements perforating selected
punches 13 indent the" lath 30 at 76 as indicated
portions ‘of the slab after it is intermittently ad
in Figures 2, 5 and 6. Therefore, as the perfo
rator is actuated, it is obvious that the lath 30 25
3. The method of fabricating a' perforated slab
will be partially perforated or indented with a
of building material comprising a layer of set or
series of indentations along the edge of the lath
hardened cementitious material adhered to sur~
or throughout the face thereof depending upon
facing sheets, which comprises the steps: form
the desired pattern of perforations and there has
ing the slab, partially drying the slab, advancing
been indicated only a simple pattern of indenta 30 the slab by intermittent movement and between
tions so that the method of indenting and the
the intermittent movements thereof perforating
apparatus may be simply, described. It is evi
selected portions of the slab, causing the periph
dent that a more elaborate pattern of perfora
ery of the perforation of partially dry cemen
tion may be used without ‘departing from the
titious material to be troweled smooth, and fur
scope of the invention by providing an increased 35 ther drying the slab whereby a perforated slab
number of prick punches. Similarly, there may
is has with the periphery of the perforations of
be formed indentations or other forms of perfo
the slab clean and smooth,
rations which may be formed by this machine
4. The method of forming indentations for
wherein the ?nished lath has suitable indenta
nail markings in a, slab of building material com
tions or perforations for applying various clips
prising a layer of set or hardened cementitious
for erecting the lath instead of the usual nailing
material adhered to surfacing sheets, which com
prises the steps: forming the slab, allowing the
In the foregoing speci?cation and in the ac
slab to partially set, and indenting the partially
companying claims, the use of the words “set” or
set slab on one face, the other face opposite the
“hardened,” in referring to the board at or about 45 indentation ?rmly supported whereby a pattern
the time of punching, is to be understood as com
of indentations is formed on a surface of the
prising the use of such words in the sense in which
aforesaid slab- forming nail markings without
they are commonly used in the art involved. The
deformation of the opposite surface of the slab
“set” or “hardening” of the cementitious ma
opposite such indentations.
terial at or about the time of punching refers 50
5. The method of forming indentations‘ for
merely to the initial set or hardening of the oc
nail markings in a slab of building material com
prising a layer of set or hardened cementitious
mentitious material which, with a gypsum core,
material adhered to surfacing sheets, which com
results from the taking on of additional water
prises the steps: forming the slab, allowing the
by the calcined gypsum, Ca2SO4.1/2H2O in con
verting to Ca2SO4.2H2O, a set or hardened condi 55 slab to partially set and indenting the partially
‘set slab by forcing portions of one of the sur
tion but with the material still wet. The set or
facing sheets on one face into the partially set
hardened condition referred to is to be distin
portion of cementitious material the other face
guished from the ?nished pro-duct which, in its
set or hardened condition, and dry, that is with 60 opposite the indentation ?rmly supported where
by as the slab of cementitious material dries, a
the excess moisture evaporated therefrom, differs
pattern of nail indentations is formed on one
in its physical condition in that the initially set
face ofthe slab without deformation of the oppo
or hardened material is relatively soft and some
site surface of the slab opposite such indentations.
what plastic, whereas the ?nally set, hardened
6. The method of fabricating a perforated and
and dry material is brittle, and when out, broken 65 indented slab of building material comprising a
or crushed tends to break down to a powder or
layer of set or hardened cementitious material
It will be understood that this invention is
susceptible of embodiment in various forms,
adhered to surfacing sheets, which comprises the
steps: forming the slab, allowing the slab to par
tially set, positioning the slab with respect to
which are illustrated in the accompanying draw 70 punching and indenting mechanism, the under
surface thereof being ?rmly supported, simul
ings and that thespecial details and methods of
taneously indenting and perforating the partially
forming the lath herein set forth may be varied
set slab, and troweling the partially set cemen
to suit particular purposes without departing
peripheral of the perforation causing the
from the scope of invention.
75 periphery of the perforation to be smoothed.
9. The method for perforating plaster board
'7. The method of perforating and indenting a
slab of building material into a pre-arranged
pattern of perforations and indentations, which
having a partially set cementitious core with ad
comprises: uniformly conveying the slab to be
intermittently advancing the plaster board along
the said support, simultaneously reciprocating a
plurality of annular knives to cut through the
plaster board and receive in their open interiors
perforated, changing the motion ofvthe slab from
uniform to intermittent, positioning the slab un
der a punching apparatus, and supported at the
hered surfacing sheets which comprises the steps
of positioning the plaster board on a support,
point of punching and simultaneously, uniformly
plugs of the plaster board cut therefrom as a
and intermittently perforating the slab until the
slab is completely perforated and indentedinto 10 consequence of the reciprocation of such annular
knives, the cut-out plugs then through continued
a pre-arranged pattern of perforations and in
8. The method of perforating plaster board
comprising the steps; intermittently advancing a
reciprocatory movement of the annular knives
ejected therefrom, the plaster board advanced
and the annular knives reciprocated in timed re
sheet of substantially wet plaster board along a 15 lation whereby the annular knives are recipro
cated only during the dwell period of the inter
support means, reciprocating a gang punch with
mittent advance of the plaster board and the
the punching stroke thereof synchronized with
cut out plugs are ejected prior to the completion
the dwell period of the intermittent advance of
the sheet, punching the sheet with the gang
ofthe reciprocatory motion of the annular knives
punch, receiving in cavities in the punches the 20 and further movement of the plaster board being
plugs cut from the sheet in punching and subse
intermittently advanced.
quent to a punching stroke ejecting the cut out
punchings from the cavities of the punches.
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