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Патент USA US2119648

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June 7, 1938-.
w, F, P|PER
Filed June 29, 1955
4 Sheets-Sheet 1
'June 7, 1938.
2,119,648 -
Filed June 29, 1955
4 Sheets-Sheet 2
June 7, 1938.
Filed June 29, 1935
4 Sheets-Sheet 3 '
June 7, 1938.
w. F. PIPER '
2,1 19,648
Filed June 29, 1935
4 Sheets-Sheet 4
Patented June 7, 1938
' 2,119,648
Walter F. Piper, Oak Park, 111., assignor to The
Beardsley & Piper Company, Chicago, 111., a
- corporation of Illinois
Application June 29, 1935, Serial No. 29,112
8 Claims. (Cl. 198—128)
The invention relates to building concrete
vided with an inlet for the concrete adjacent its -
structures such as tunnels, sewers, conduits, and lower portion, a rotor in the casing provided with
’ paddles for centrifugally slinging the concrete
the like.
through a peripheral outlet in the casing, after
One object of the invention is to provide ap
5 paratus for centrifugally slinging concrete to it has travelled around the casing and been sub
pack it into place in building concrete tunnels,
conduits, and the like. By centrifugally slinging
the concrete into place it has been found that
the concrete becomes properly packed to eliminate
10 undesirable voids and particularly in the side and
cap portions of a tunnel or conduit.
Another object of the invention is to provide
apparatus for centrifugally slinging concrete in
building concrete structures.
Another object of the invention is to provide a
centrifugal slinger for the construction of con
crete tunnels or conduits, which is equipped for
changes of position to sling concrete laterally to
either side or in the cap portion.
Another object is to provide a centrifugal con
Crete-slinger which is equipped. for projecting
concrete at different angles.
Another object of the invention is to provide a
concrete slinger which is e?icient in operation
25 and has a large capacity.
Other objects will appear from the detailed de
The invention consists in the several novel
features which are hereinafter set forth and are
30 more particularly de?ned by claims at the con—
clusion hereof.
In the drawings:
Figs. 1 and 2 are cross-sections of a tunnel illus
trating the method of slinging concrete to build
35 up the side-Walls of the tunnel.
Fig. 3 is a longitudinal section of the tunnel il
lustrating the method of slinging concrete to
form the cap or key-section;
Fig. 4 is a transverse section of the centrifugal
40 slinger;
Fig. 5 is a section on line 5-5 of Fig. 4;
Fig. 6 is a plan of the slinger;
Fig. '7 is a detail side elevation of one of the
devices for adjusting the casing to keep taut the
45 chain for driving the rotor of the projector;
Fig. 8 is a detail showing one of the paddles
' on the rotor of the slinger;
Fig. 9 is a detail section through one of the
Fig. 10 is a transverse se ction of a modi?ed
form of the invention; and
Fig. 11 is a side elevation of the form of the
invention illustrated in Fig. 8.
The centrifugal projector for slinging the con
55 crete is exempli?ed with a drum or casing pro
jected to centrifugal force therein, and mecha
nism for driving the rotor at the proper speed to
sling the concrete from a position inside of the
tunnel into the form for the concrete. This ap
paratus is adapted to project the concrete tan
gentially and obliquely to ?ll the form at either
side of the tunnel and is adjustable to vary the
position of the discharge-opening so the paddles
of the rotor will project the concrete at different
angles, as the concrete is built up, and also into
the cap portion or section of the lining.
The projector casing comprises a pair of cir
cular sides l2, each formed of plate-metal ?xedly
secured by screw I3 to a hub l4, and having an
‘outwardly extending circumferential flange 15, a
peripheral wall 16 secured on the ?anges l5 of
the casing by clamping bands I‘! which extend
around the marginal portions of said wall and
are provided with bolts I8 for ?rmly securing the
bands around wall It to ?xedly secure said wall
to the sides H of the casing. On account of the
wear to which the inner face of peripheral wall I6
is subjected it is preferably formed of a'plate of
metal bent into cylindrical shape and removably
clamped to the side plates I2 so the wall can be
conveniently replaced when it becomes Worn.
The ends of this cylindrical plate are spaced apart
to'leave a gap or peripheral opening 19 through
which the concrete is projected from the casing.
The sides l2 of the casing are held in a spaced re
lation independently of the peripheral wall plate
l6 by spacer bolts l2a which are ?xed in brackets
[2b which are ?xed to the outer faces of the
casing sides. This construction exempli?es a
casing having its peripheral wall formed of a cy
lindrical plate of metal which can be readily re
placed when it becomes worn and can be pro
duced at a low cost of manufacture.
Each side l2 of the casing is provided with an
arcuate opening~20 through which the concrete
is supplied to the lower portion of the drum. A
hopper 64 is mounted adjacent each side of the
projector casing to direct the concrete through
the inlet openings 23into the lower portion of
the casing where it will be engaged into the path
of the paddles. These hoppers are ?xedly sup
ported on the supporting frame members 32 by ,
bars 65. In practice a substantially regular
stream of concrete is delivered into either of the
hoppers 64 while the projector is’ in operation. 55
Thisrrnay be done by any suitable conveying ap
proximately four feet in diameter with a rotor ’
travelling at a speed ranging from 115 to 165 ‘
paratus, such as an'endless beltor other suit
able conveyor from the concrete mixer.’ '
The hubs of the casing are-rotatably' mounted
in hangers‘orbrackets 30 which are carried'by
a supporting frame having-its base extending
revolutions per minute will compact the concrete
and project it through outlet IS with such force 7 V
c that it’ can be controllably delivered or placed’
approximately eight to ten feet from the point of
' under the 'casing andjcomprising upstanding
discharge from the casing,
sides or members’ 32 at ‘the sides of the casing,
The mechanism'for driving the paddles com-i "
prises an electric motor 35 mounted on an end
angle cross beams 33 and a central transverse’
10 channel bar 34 all of which are'rigidly secured-v > plate 36 which is ?xed to the frame in which the’
together inany suitable manner’. This support?“ projector is mounted, a pinion 31 on the motor
ing framev exempli?es a structure which is adapt
sha’ft, a gear 38Lmeshing with said pinion and ‘
ed to support the projector from below so as to
' leave‘clearance for the slinging ‘of the concrete
?xed to a shaft 39 which is journalled in bear- 7
ings '40, a sprocket wheel 4| ?xed to one end of
through the peripheral discharge opening in the
shaft 39, a ’ chain 42 driven by said sprocket 15
casing within a- su?icient range to permit the
and a sprocket wheel 43 ?xed to the shaft 227
'concrete' to i be a projected laterally- and down- so
of the rotor and driven by chain 42. The brack,
wardly'or laterally and upwardly to sling the ‘ ets 30'which carry the shaft 22 of the rotor are;
concrete over the top margin of the form" asit 'connectedlto the supporting frame members 32’
20' is_ successively built up to higher levels for the ' by bolts 60 which pass through slots 75!‘ insaid‘
- sides of’ the tunnel.’
bracketsrto permit the casing and rotor to be
, jTheroto'rf’forT centrifugallylprojecting the con?
adjusted as aunit relatively to the drive ‘shaft
V crete from” rthe'pcasingi comprises 'ahub 2i keyed’ ' 39 to keep 'the'driving chain 42 tautjtRodsf??"
to_a drive ‘shaft 22: which-vis-journalled in the hub
14 of the casing, a'pa'i'r of oppositely extending
have their inner ends welded to brackets v3!! and
their outer ends provided with screw'threads'rior
nuts 63 whichbear against the frame'mem'ber's
radial arms 23', and paddles '24 carried at the
outer ends 'ojf-isaid arms. ' Each_’arm 23 ispref
32 for convenience in adjusting said brackets-L}
erably formed ‘of’ plate metal" and has " welded 'The base of‘the supporting frame for thejpfo:
;_ p to’ its outer‘ ‘end ‘a ‘tangentially extending plate jector is swiveled to turn horizontally to permit
36" 25.1’, ‘Each? paddle iblade consists of’ astrip of the projector to be rotated tosling the concrete
rubber i267 twhichiisjbaclged' on‘ plate 25 and on along the sides to either side andalso to permit _
V its'?froritrhas a iace platei'2‘l." The rubber :Istrip' ' the projector to be turned so 'thepaddles will
and-plateare removablysecured to: plate 25 by rotate'longitudinally‘of the tunnel or conduit in
bolts 28. _ Theouter andjside margins of the rub;
ordereto slingjconcrete'into (the vcap section Lor
'ber strip 26 are free; to" engage and wipe the con
portion thereof. 7 "For thislpurposc- a 'verti'cal'spin
tiguous surfaces of the casing. ' The 'front “or ,dle 44 is‘?xedto and; depends 'from'the channel.
operative iace ofherachepaddle ‘24 is ‘tangential or 'bar '34 of the projector supporting ‘frame-land
- a it oblique?tok its radius so "that in its-rotation the journaled in a~socket>45 on a1 wheeled truck’
i c concretefwill; be ‘directed: toward the’ angular
‘ 40“, space adjacent :the linenof contact between ,the'
which comprises afra-rne composed of channeled
sills 46 rigidly connected-by cr_oss_ channel bars‘
- outer end vofjthe'rubberv plate 26_ andthe'inner ‘ 41 and wheels 48 on axles49r'which, are ?jour'naled'
surface of the peripheral wall l6 of the'cas'ing'so in the truck frame and are adapted'to'runjon
that “the concrete in ‘transit. from the lower pore g rails '50 which are usually flanidr o'nma temporary
f a“ tionof, ‘the casing ,_to its-upper portion will be’ 'platform'or staging’ 5| inthe'rtunnelor conduit. 5
lbeforejit'isdischarged’ through opening
45“ packed
l9.- :It hasbeenifound that bylproviding the
- paddles with rubbernbladesrfor engaging the'pe
' riphery aiidrsihdes Of'the?aSinathQ liquid content’
_ of the concretewill be lifted ginithescasingtwith
' the’ solids and projected therefrom; so‘ that
the concrete projected will ‘be evenly constituted,
This mounting’, for the concreteeprojector' makes
it possible to rotate it so- that the discharge open
ing I 9 for the concrete may beporsitionedto sling
the concrete etowardweitherjside'oi,the‘ tunnel 7'
by swinging the; projectorapproximately."180‘;
which movement will'also cause the paddles-24
to' project the concrete‘ accordi_ngly.'_;It_ alsqper;
These strips-,hwhenwmade of rubber of_thedensiV-‘ ' mits the‘ projector qtohbe swung; horizontally: to
' 'ty of tire rubber,_have;been found to?be durable,
e "A series of sectoreshaped plates,29fare secured
sling the concret‘epalong. a side, of-theitunnel
a certain range;
' fgifto thehinner?fa'ces Oj'?hei side?’ plates 12in the’
,In order
is discharged‘rto
to vary the'_angle'atjwhicliithe
directith'e stream‘ tangent-‘t.
zone traversedby‘thje elastic blades 26. The crete
ends of said blades wipe the inner faces of; plates tially and downwardly when'building theQlower, " ‘
29 ‘ to’ prevent the ‘escape of thegconcrete,aroundv portions of.‘ the sides of ‘the: ?annel and .110 direct"
_ the ends, of the‘paddles ‘while/‘the concrete‘;
‘ ithigher as the'form is ?lled and built rupjjhej
"- being lifted?in the casing and until itis dis-.1 casing is. rotatable around?the axisof ithefproe‘r
chargedtherefrom,_; [The‘inlet openings Zil'foi'j jector to bring-‘the discharge.‘ opening. l9 finto'
the‘ concrete are disposed in the lower’ arc of '7 position to sling the'icon‘crete':at/diiierent.‘verti
rtheicasingandthe discharge’ openingql'il isQlo-i ' cal angles. For ‘this’ purpose‘; the hubs l 410i? 1
cated in the upperhportion of the casing‘ so' that‘
" each, or the vpair of paddles will; in v'itsf_1‘ota-.,
the casing, are rotatable
windlaissis provided fqrrotatihe increasing." This
tion; traverse‘thelower: arci ofiithe ,cajsin‘g, ‘em; Windlass ‘comprises a handiwheel :52'lr?xedkto-iah
gage 'a__batch of concrete and con?ne it between transverseshaft53;.whichjs?mouhtedingbearings; 7'
the periphery and'sidesof' the casing an-d'lift‘ ' 54 V?xed to" the supporting "frame for'tlie‘pro-w
' the batch‘jtogthetgupper lportioni oftthejc‘asing.
_ During thismovement‘ theconcretei‘will be‘SLlb- ,1
{ brackets 3]} and; a‘ i
jector and. a>cab1e:55 having its'gends ‘connected:
as at 56' and 51 to‘ lugs "?xed ‘toathei clamping
jected to, centrifugal, force land the‘ batchjwill be '‘ bands ' l1.’ Bye rotating’ the'lhand ‘wheel. 52 ,in'
either" direction
the position?of
the ‘casing
may iber'rotatédetoa
l9 ‘ 7 I
" openingl l9lthec batch of- concrete lifted by itwill control
packed." ‘As eachi'f'p'addle reaches the discharge
be ‘Plf'éiédéd_1byéthereddlean§l cehiri'fueallfdrce? ' and the angle Iat’which the concrete will be dis-_; .._;
'75 from’ the" casing.
In’ practice‘ a casing or ape” chargedfrom' the é'asingf 'A ‘roamed wheel’ 58"
on the shaft 53, and a dog 59 adapted to engage
said wheel are adapted to lock the Windlass and
the casing in assigned positions.
The method of placing concrete in a tunnel or
conduit and the operation of the slinging appa
ratus is as follows: After a section of the tunnel
has been excavated in the usual manner as well
understood in the art ‘and circumferential ribs
A with a sheathing B have been put in place to
10 hold the surrounding material, the concrete for
the base portion or floor 0 of the tunnel may be
directly poured or spread into place in the usual
manner. The side portions of the form are
erected a few feet in height and the concrete
15 may be shoveled or pour-ed directly into these
lower side portions because these portions are
readily accessible. When the form has been
?lled with concrete to- approximately the top of
the partial form, sections of several feet of form
20 are added at one side of the tunnel.
The pro
jector is then adjusted by means of the Windlass
to sling the concrete downwardly and laterally to
that side of and lengthwise of the tunnel with
in range of the projector until the portion of
the form which has been erected has been ?lled.
While this is done the form is built up at the
side of the tunnel and at ‘different angles while
?lling the forms as before described. By operat
ing the Windlass for cable 511EL in this form of‘
the invention the casing can be adjusted to vary
the direction of the concrete for these purposes.
The driving mechanism for the projector is
mounted on one side of the supporting frame to
leave clearance for the projection ofthe cone
crete to either side of the tunnel. In this form
of the invention the projector and its supporting .10
frame are mounted on the truck so it can swing
90° for ?lling the cap or key zone with concrete
as previously described and to sling the concrete
along the section within range of the projector.
The driving mechanism for, the projector com
prises an electric motor 35a, a bevel pinion 3'18L
on the motor shaft, a bevel gear 38 rotating on a
stud 39a, carried by the supporting frame, a
sprocket e la ?xed to rotate with gear 38a, a chain
Ma driven by a sprocket 4 la, and a sprocket wheel
key or cap section or zone is reached where it
is impossible to project the concrete vertically
40 into place. During these steps the projector will
tion of the concrete to either side.
to form the sides and top of a tunnel or conduit
concrete has been extended to the cap or key
45 zone the projector is rotated on the truck about
90° to bring its axis transverse of the tunnel as
tions of the form and which results in making
the concrete of substantially uniform density
and upwardly into the cap or key zone until it
has been completely packed and ?lled.
55 sheets may be successively put in place, so that
the spaces above them will be comparatively
short and can be packed with concrete without
voids above them. By this method the cap or
key zone of the concrete can be ?lled by projec
tion so that it will be as solid as desired. This
is an important factor in the cap or key zone of
the tunnel. When a longitudinal section of the
tunnel has been completed in this manner, the
projector will be moved to the next section and
65 these operations will be repeated.
In the modi?ed form of the invention illus
trated in Figs. 10 and 11 the rotor is reversible
and is provided with oppositely facing, relatively
paddles 24a, and the motor 35a is of
70 inclined,
the reversible type. The casing is similar in con
struction to that previously described.
range of rotative adjustment of the casing is
increased so that the peripheral discharge open
ing l9a can be shifted to sling concrete to either
The invention exempli?es a method of, and
apparatus for, expeditiously projecting concrete
and has a great capacity. It also exempli?es
one which can be quickly and conveniently set
to project the concrete, to different elevations for
illustrated in Fig. 3 and the casing is adjusted
so the concrete will be projected obliquely up
ward. The form is then completed under the
50 cap section step by step, with a steel sheet sev
eral feet in width, and the projector is operated
to sling the concrete longitudinally of the tunnel
and to sling it in the desired direction.
rotatively adjusted so the paddles will sling the
concrete in the desired directions. When the
be rotated on the truck and the casing will be
43*“ ?xed to the shaft of the rotor. All of.this
mechanism is mounted at one side of the sup
porting frame to leave clearance for the projec-.v
In the operation of this form of the invention
the casing is rotatively adjusted by the Windlass
opposite side of the tunnel. Next the projector to bring the discharge opening 58a to the side
will be swung horizontally about 180° to sling Where the concrete is to be projected and the
reversible motor is operated to cause the paddles
concrete into the form at the latter side of the
to rotate and lift the concrete from the lower
30 tunnel until it has been built up to the top of
the incomplete form. During this ?lling the portion of the casing upwardly around the oppo
site side thereof and to sling it through said open
form will be again built up for several feet at
ing. When the concrete is to be discharged at
the opposite side. The projector will be rotat
ably adjusted to sling concrete over the top of the other side of the tunnel the casing is rota
tively adjusted accordingly and the direction of
35 the section of the form last erected and ob
rotationv is reversed which will cause the oppo
liquely against the tunnel liner until the con
sitely facing paddles to lift batches of concrete
crete reaches the level of the form as far as
erected. These steps will be repeated until the
successively ?lling the, successively erected sec
without weak spots and defects.
The invention is not to be understood as lim
ited to the details set forth and may be modi?ed 50
within the scope of the claims without depart
ing from the spirit and scope of the invention.
Having thus described the invention, what I
claim as new and desire to secure by Letters
Patent is:
1. In a concrete slinger, the combination of
a supporting structure, a casing supported by
the structure and comprising sides and a cylin
drical peripheral wall having a discharge open
ing for concrete, a vertically-operating rotor in 60
the casing comprising a shaft extending trans-j
versely through the casing and a paddle for trav
ersing the'outer portion of the casing, and adapt
ed to centrifugally sling concrete through the ,dis
charge opening, one of the sides having an arcu
ate and elongated inlet opening for concrete dis
posed radially outward of the shaft and to deliver'
concrete longitudinally into the lower part of the
casing and into the path of the paddle, mech
anism for driving the rotor, means for rotatably 70
adjusting the casing in the structure to project
the concrete at different vertical angles, and
stationary means for delivering the concrete to
the arcuate inlet opening.
2. In a concrete slinger, the combination of 75
a supporting" structure,‘ afc'as‘in'gi is‘upportedi by ' and; to the'iothérfsidej wnezritjisi driven‘inthef
the structure",and?comprisingsidesr and Ta ‘cylin
drical peripheral 'walli'having' a'i dis’chargegbp'eni
6. In a rotary concrete 'slinger‘, the combination
ing for concretaia vertically-“operating, rotor‘, in of a? casing provided with‘a peripheralltdischarge
the casing comprising a shaftextendingt'rans
versely' through the; casing and, a ‘paddle for
traversing the ‘outer ' p'orti’on'iof “the ,casing ‘and
fada'pted' to“ rcentrifug'allyf sling ‘concrete through
the dischai‘ge'openin‘g; 'on'e o‘ffthe’ sides ‘having
an, inlet opening'to‘ deliver 'concretei'longitudi
nally into thelower partrof the casing ‘and into
openingfa rotor’ in the casing provided with’
oppositely facing, relatively langled, faces for, re-‘
spectively, lifting 'and‘ projecting concrete in oppo-l ~
site directiona'means for ‘driving ‘theiroitor in‘
7 either direction to correspondingly project‘the v
concrete,v and'r‘means' for variably positioning the ,,
~ discharge-opening ‘so ‘the concrete will be" dis‘;
the path of the paddle, mechanism for driving charged to one side 'of the“ casing when the rotor
7 the rotor, and meansfiforrotatably adjusting, the ' is'driven in one direction and to‘the other:side ,
casing 'in' the structure to_ project the concrete when it is' driven'in the opposite direction. .'
at different angles, comprising a cable around
‘7. In a' rotary concretejslinger‘, the combination ~
the casing and a Windlass for the cable.
of a rotatablylmounted casing" provided with a’
3. In'a centriiugalslinger, the combination of
a casing comprising‘ sides and a cylindrical plate
of metal forming-the outerwall and terminating ‘
'20 ‘to provide a peripheral discharge opening, clamp
peripheral discharge opening, a‘rotorrfin the case
ing' provided rwith oppositely. facing means, for i '7
respectively lifting and slinging concrete when
the rotor is driven in‘opposite directions‘; means
iing bands-for removably securing the plate on the for driving the rotor'in" either ‘direction 'to pro-.
sides, a rotor in the casing provided with a paddle ject the‘ concrete; and means for rotatably 'ad-'
for‘lifting, concrete and slinging it-throngh the .rjustingo-the' casing 'to ivariajbly' position :the {dis
,7: opening, and mechanism for driving the rotor. V ‘
charge opening so the concrete will be discharged
Inarotary concrete‘slinger, the combination to one‘side Whenthe rotor is driven "in one. direc .25
of a casing providerd'with a ‘peripheral discharge 'tion and'to the ‘other sidefwh7 n‘ it is :driven in
opening, a supporting structure for the casing,’ the opposite direction. ' ‘ j' i
a rotor provided with a paddle comprising a strip " ‘ '8. In a rotary concret‘eislin'ger, the combination
formed‘ of elastic material and a rigid backing of a ‘casing provided’ with 'ajp'eripheral discharge
opening, a rotor mounted to'rot'ate vertically in
30 and facing for said strip, ‘and mechanism for
driving the rotor.
5.’ In a rotary concrete slinger, the combination
of a casing provided with a. peripheral discharge
"openingfa' rotor in the casing provided with op
positelygfacinglmeans for respectivelyilifting and
projecting concrete in opposite directions, means
the casing and provided with oppositely facing
paddles forrespectively projectingcon‘crete when
the rotor‘ is'driven in oppositedirections», means i i
for driving the rotor in either direction to project '
the concrete; means 'for variably'positioningrthe, ’
discharge opening so jthe" concrete will'bei dis; ~
for'driving the rotor in either direction to cor
charged to onenside when the rotor isdriven in
respondingly project the concrete; and means for
on'e'direction and to‘theptlier side when it, is
driven ‘in the opposite direction,‘ andfa- vertical
pivotal support for the casing.
variably positioning the‘discharge-opening so the
concrete will berdischarged to one side of the
casing when the rotor is driven in one direction p
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