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Патент USA US2406025

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Aug. 20, m'.
H. L. MOOR
PIPE FORMING MACHINE
Filed May 51, 1943'
2 Sheets-Sheet 1 `
INVENTOR.'
.
#FQMA/v ¿_ Moo/Q.
BY
‘
má
,
Au., w 1946.
H. L. MÓOR -
¿406,25
PIP-E FORMING MACHINE
Filed May 3l, 1945 ì
2 Sheetßs-Sheet 2
`
'
_.INVENTOR.
#EQ/»MN L Moog.
BY
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l*
_ l
~
Patented Aug. 20, 1946
¿40ans
UNITED STATES PATENT OFFICE
PIPE FORMING MACHINE
Herman L. Moor, Olive Township, St. Joseph
County, Ind.
Application May 31, 1943, Serial No. 489,109
21 Claims.
l
(Cl. .Z5-3.2)
2
,
This invention relates to a pipe forming ma
An larcuate longitudinal wall I5 concentricwith
bottom I2 extends from a point intermediate the
ends of the frame to the rear of the frame and
merges with a »cylindrical portion I6 projecting
’ rearwardly from the frame. The outer diameter
of portion I6 conforms -with the outer dia-meter
of the pipe to be formed. A vertical chute or
passage I1 projects upwardly from wall .I5 and
communicates with a hopper I8 which is secured
to and supported by the rear end of walls II at
its upper end.
chine.
The primary object of the invention is to pro
vide a machine for simultaneously making and
laying in a trench a continuous and jointless pipe
formed of concrete or other plastic material.
A further object is to provide a machine of this
character with means for incorporating reinforc
ing material within a pipe as the same is formed.
A further object is to provide a machine of
this character for compacting backñll around a
form in advance of the pipe-making and layingN
operation, whereby said compacted backñll con
stitutes the outer form for the pipe.
Two or more cross bars I9 are secured to and
extend transversely between the «walls» II adja
A further object is to provide a machine of -'
this character with means for vibrating the plastic
thereon by any suitable mounting members 2|.
Drive shaft 22 of the engine projects rearwardly
material while the same passes from feed means
to molding forms thereof.
therefrom and is journaled at its end in a bearing
23 carried by a cross bar 24 extending transversely
between and secured to the side walls I I.
A pinion 25 is keyed to shaft 22 and meshes
with a gear v25 therebelow keyed to a shaft 21.
The shaft 21 is journaled in a bearing 28 sup
ported by a cross bar 29 extending between and
secured to sides II. A second lbearing 30 mount
ed on a bracket arm 3I supported at the front
end of wall I5 also journals shaft 21. A bevelled
pinion 32 is mounted on the rear end of shaft 21
A further object is to provide a device of this
character having an elongated ñexible inner form
trailing therebehind to provide an interior sup
port for the fresh-laid pipe during the period the
same is setting to shape.
A further object is to provide a machine of
this character which is self-propelling.
A further object is to provide a machine of
this character with a rotating and vibrating cyl
inder mounting a screw to feed plastic to and
compact it in an annular mold cavity, said cylin
der constituting part of an inner pipe mold.
Other objects will be apparent from the draw
cent the front thereof and an internal combus
tion engine 20 or other drive means is mounted
vand meshes with a bevel gear 33 keyed to a trans
The ends of shaft 34 are mounted
30 verse. shaft 3d.
ings, description and appended claims.
In the drawings:
Fig. 1 is a top plan view of the machine with
parts shown in longitudinal transverse section ,.
in openings formed in side walls I~.I and spanned
.by plates 35 secured to the outer faces of said
walls. Shaft 34 is journaled in bearings 36 sup
ported by vertical bracket arms 31, Fig. 3, pro
jecting upwardly from wall I5 and by longitudinal
bracket arms 38 projecting forwardly from chute
.I1. Adjacent .the opposite ends thereof, shaft
`34 has circular .cams 39 mounted eccentrically
thereon and -keyed thereto and encircled by rings
taken on line I-I of Fig. 2.
Fig. 2 is a longitudinal vertical sectional view
taken on line 2-2 of Fig. 1.
Fig. 3 is a vertical transverse sectional View
taken on line 3-3 of Fig. 2.
di) 45 mounted on the forward ends of a pair of bars
Fig. 4 is a Vertical transverse sectional view
4I extending longitudinally at opposite sides of
taken on line 4_4 of Fig. 1.
chute -I1. Bars 4I mount _a transverse ramming
Fig. 5 is a vertical transverse sectional view
plate 42 at their rear ends and adjacent >and rear
taken on line 5-5 of Fig. 2.
wardly of the rear ends of side walls II. The
Fig. 6 is a vertical transverse sectional View
plate `42 is of a width slightly less than the width
taken on line 6_6 0f Fig. 2.
.of frame Ill, .and has a concave arcuate lower
Fig. 7 is a side view of the vibrating inner cyl
4edge ,43 whose radius is slightly greater than the
inder of the machine.
radius of the outer. periphery of frame cylinder
Referring to the drawings, which illustrate the
I6 upon which the lower central portion of said
preferred embodiment of the invention, the nu 50 plate 42 bears in spaced relation to the rear end
meral II] designates the frame or body of the ma
of said cylinder.
y
chine. Frame I0 is formed of rigid metal plate
material and comprises vertical side walls II, an
arcuate bottom I2, and an arcuate front I3, said
bottom and 'front merging in a curved portion I4.
A wideannular bearing 44 is mounted at the
forward end of the annular space deñned by
frame bottom I2 and wall I5, said bearing pref
erably comprising Aan outer raceway -45 and an
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inner raceway 46, each having two or more spaced
4
extends into the rearmost element 10 and ñxedly
mounts a fitting 15 having a cup-shaped or an
registering circumferential grooves receiving hard
nular retainer 116 against which the rear end of
metal bearing balls 41, and end retainer rings
a tensioned coil spring 11 encircling said cable
48 suitably constructed to seal oil therein and
exclude plastic. A cylinder 49 is journaled in Cil bears. A disc 18 having a small central aperture
'i9 nts within the rearmost element 10 and bears
bearing 44 adjacent its front end.
marginally against the internal shoulder between
Cylinder 49 is best illustrated in Figs. 2 and '1,
element 19 and reduced diameter collar 1| of said
and its outer diameter is equal to the inner diam
element. Spring 11 presses against >the outer
eter of the pipe' to be formed. The cylinder is
elongated to project rearwardly from >the cylinder' 10 outer face of disc 18, and cable 13 passes freely
through aperture 19. Any selected number of
I6 at 59 and to project forwardly of wall l5 at 5|.
A helical external feed screw 52 is carried by the " .l elements 10 may be interconnected in this man
central portion of cylinder 49, extending from
bearing 44 to a ,point substantially coincident
' A vertical boom or mast 80 is ñxedly mounted
with the rear end of frame cylinder I6. The 15 at the front of frame I0, said mast being sup
ported in a socket 8l carried by the lower portion
screw 52 is of a diameter less than the inner
. of the front of said frame, and being positioned
diameter of cylinder I6. Two or more spaced
by retainers S2 above said socket. The upper
longitudinal ribs 53 are secured within`cylinderv
most retainer may include a hitch ring 83. Mast
I6, said ribs being of a thickness to be engaged ‘
by screw 52 to form supports for the cylinder 20 89 preferably extends to a considerable height,
and mounts brackets 84 «projecting laterally and
oppositely therefrom adjacent its upper end.
Each bracket 84 journals a pulley 85. A pair of
opposite> laterally projecting brackets 86 is se
sure plate 56 is removably mounted on the front
end of cylinder 49 and has >a central bea-ring 51. 25 cured to mast 80 intermediate the height thereof.
Each bracket 86 mounts a winch 81. A guy ca
A disc 58 Ais fixedly mounted within the cylinder
rearwardly >of bearing 44. -The rear end of cyl
inderA 49 is provided with aclosure plate or spider
54 having Ya central aperture 55 therein. A clo
intermediate the ends thereof and has a. central
ble B8 is wound on each winch, extending up
wardly around a pulley 85 and then extends lat
bearing 59. A shaft 6,6 having a central bore 6I
erally to an anchor spaced from the trench 89
therethrough is journaled in bearings 51 and 59,
and projects» forwardly `from the cylinder. An 30 in which the machine operates. Mast 80 is pref
erably of such height and the guy anchors are
unbalanced arm 62 is ñxedly secured on shaft
preferably so spaced from the trench that work
69 adjacent disc 58. A pair of abutment rings
men and vehicles may pass thereunder without
63_‘are~secured to shaft 60 onropposite sides of
interference. Whiletwo guys have been illus
bearing 51 to prevent relative endwise movement
of the shaftand cylinder. The portion of cylin 85 trated and may be adequate to support the ma
chine in vertical position in the trench, four may
be used if desired by providing the necessary num
ber of pulleys and Winches therefor.4
A pulley 6_4 is mounted on engine shaft 22 for
An.> elongated bent tube 90 having a vertical
wardly of pinion 25, and a pulley 65 is mounted
on the forwardly projecting end of shaft _60. A 40 portion secured to the` front of the frame at 9|
and a rearwardly longitudinally extending lower
`belt 66, preferably a V-belt, is trained around
portion supported by a bracket 92 is mounted
said pulleys to rotate shaft Vlill and unbalanced
within the machine frame with its rear portion
ann 62 at comparatively high speed, thereby
terminating adjacent to and in axial alignment
causing said shaft and the cylinder to vibrate.
with shaft 60. Suitable means (not shown) may
_The forward projecting end portion 5I of cyl
feed reinforcing wire 93 (Fig. 5) into said tube
inder >49 mounts an `annular sprocket 61, and a
to be guided therethrough and into bore 6I of
sprocket 68 is mounted on shaft 21 intermediate
shaftI 60. A second bent tube 94 has its ends
bearings _28 and 39. A chain 59 is trained around
secured by an L-shaped bracket 95 ñxedly se
said sprocketsto rotate cylinder 49. It will be
cured within the cylinder 49 rearwardly of disc
50
noted that the cylinder 49 is rotated at a low
58, whereby one end thereof is axially aligned
speed compared with the rate of rotation of shaft
with bore 6l to guide wire 93 from the shaft
4lill, by virtue of the speed reduction effected
bore to and through a hole 96 in the cylinder.
through gears 25 and 26 and through sprockets
As here illustrated, hole 96 extends through one
61 and 68.
An elongated flexible inner pipe form trails be 55 of the convolutions of screw 52 at a point rear
wardly of ribs 53 and adjacent the rear end of
hind cylinder 49. As herey illustrated, this forni
cylinder i6, whereby said wire is coiled as cylin
is made up of a plurality of articulated annular
der 49 is rotated.
,
,
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non-collapsible sections or elements -10 each of
One or more additional tubes or guides 91 'may
the same outer diameter as portion 50 of cylin
der 49. Each element 10 hasv a reduced diameter 60 be mounted within the frame at the front thereof,
supported’by brackets, as brackets 9i and 92, for
portion 1I projecting from the front end thereof
passage of longitudinal reinforcing> rod stock
and ñtting within the rear end of the preceding
therethrough by any suitable means (not shown).
element or of the cylinder 49 with a small clear
Frame lll and wall I5 may have longitudinally
ance» The rear edge of each element and the
shoulder between the same and portionll at the 65 spaced openings 98 and 99 therein through which
such rod stock may be'pas'sed. The rearmost
~front thereof, are preferably -:rounded or tapered
openings will preferably be positioned in advance
at 12. The construction and interñtting relation
of the front ends of ribs 53, Sc‘that said rod may
‘of elements is such as to permit a limited amount
der between disc 58 and closure plate 56 may
contain cooling fluid, such as oil. '
of angular displacement of adjoining elements 10
pass therebetween to be guided longitudinally
to'permit the same to follow a bend in a pipe. 70
The elements 19 are interconnected by a, cable 13
thereby.
>passing therethrough. The front end of cable 13
extends through opening 55 in rear cylinder wall
54 and fixedly mounts a fitting 14 bearing against
.
,
The operation of the device is as follows: The
machine is lowered into trench 89 and may be
pulled along therein immediately behind a trench
digging machine by4 any suitable means (not
.said cylinder __wal1. _The rear` end pf ¿cable 13 75 shown) which pulls a ’draw member .connected t0.
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the machine at 83, or the machine may be per
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time forsetting thereof, during which time theV
mitted to propel itself as hereinafter described.
mix must be confined within aform,VVV This is ac
The guy cables 98 are connected to hold mast 89
cor'n'plishe'd` in the‘instant device by thetrailing
and the machine frame in vertical position; the
flexible' inner' form. The length of this form
reinforcing wires 93 and the longitudinal rein 5 which is required will depend upon various fac-forcing rods are threaded or guided to proper
tors, including the rate at which the machine ad
feeding position in the machine; and hopper I8 is
vances, the setting properties of the mix, i, e., the
filled with the concrete or other mix; and the
percentage of water contained in a concrete mix,
machine is ready for operation. Best results are
etc., .and the quantity of reinforcing metal em
obtained by using a concrete mix containing a
ployed. Thus the length of the trailing form
minimum amount of water, and the mix may also
used with concrete pipe may vary from a mini
be treated to impart quick-setting properties
mum of forty or fifty feet to two hundred feet
thereto.
i
or more. Note that the rotation of cylinder 49 by
Upon operation of the engine 20, three opera
which the trailing form is drawn may impart a
tions occur, apart from the feed of the rein
limited rotation to at least some of the elements
forcing wire and rods, namely, reciprocation of
of the trailing form, and such rotation in con
ram arms 4I and ram plate 42 by cams 39, rota
junction with the forward movement of the trail
tion of cylinder 49 by chain 69, and rotation of
ing form serves to smooth and finish the mix at
shaft 99 and unbalanced arm by belt 65. Back
the interior of the pipe as the mix is setting up,
fill Iûû is continuously emptied into the trench 20 thus forming a smooth solid inner peripheral pipe
89, and is compacted by the ram plate 42 whose
surface which is a distinct advantage.
stroke terminates forwardly of the rear end of
It will be apparent that the guy cables must
frame cylinder I6. Hence cylinder I9 constitutes
be advanced from time to time as the machine
an outer form around which the backñll is com
advances, and this renders the provision of four
pacted, so that the machine forms a circular earth
such cables, together with automatically adjust
tunnel therebehind. Also, it will be apparent that
able Winches 81, an advantage inasmuch as the
if the backfill material is emptied into the trench
operation of the machine may then be continuous
continuously, the action of the reciprocating ram
since the machine would not then have to, be
plate 42 pressing thereagainst will serve to prop-e1
stopped for guy cable manipulation. It will be
the machine forwardly in the trench at a rate - understood, however, that guy cables have been
proportional to the rate at .which the backiill ma
shown and described as illustrative only of one
terial is fed. rI‘his action assumes, of course, that
convenient means for positioning the machine,
the backñll material is of a consistency to permit
and that other positioningmeans may be utilized
compactingl thereof, since it will be apparent that
if desired.
the backñll must be finely compacted to form an
From the above it will be apparent that the
abutment against which the pushing action may
machine possesses -the following distinct advan
be exertedand also to maintain its shape after
tages, among others: automatic operation; man
the frame cylinder passes therefrom.
The rotation of cylinder 49 serves to rotate
screw 52 to feed the plastic mix rearwardly for
ual labor or attendance is held at a low point;
inder 49 is rotated, the mixis compacted in the
annular receiving cavity therefor to insure uni
formity and solidity of the pipe IUI being formed.
fllled pipe as compared to the cost of a conven
the machine is capable of self-propulsion; all
attendants work at ground level; a strong com
continuous discharge into the annular cavity be
pact jointless pipe is produced; the pipe is
tween the inner form and the circular cavity in
formed in the position at which it is to remain
the compacted backñll behind the cylinder I6.
in use, thereby minimizing the problem of stresses
By properly correlating the rate of forward move
incident to settling of surrounding earth; and
ment of the machine with the rate at which cyl 45 the speed and low cost of the finished, back
Rotation of the cylinder 49 also serves to wind
reinforcing wire 93 into helical form concentric
with and properly positioned in the pipe wall in
termediate the inner andr outer peripheries there
of.
The cylinder is vibrated by the comparatively
tional pipe line which includes the multiple
factors of manufacturing cost, transportation,
handling, joining and back-filling, etc.
i Another >feature of the machine is that it is
not adversely affected if small quantities of water
are present in the trench, since the mix is fed
into the receiving cavity therefor between the
inner form and the compacted contoured earth
back-fill under pressure sufiicient to force the
water ahead of the rear end of frame cylinder I6,
and thus prevent adverse effect thereof upon
high speed rotation of shaft 69 and unbalanced
arm 62 therein, and thus the plastic mix is vi
brated as it is kpropelled in the cylinder I6 by
screw 52. This also assists in the compacting and
the newly poured mix.
solidifying of the mix. Note that the journaling
of the cylinder 49 at its forward end.- only pro
1. A machine kfor forming a pipe in a trench,
vides a cylinder mounting facilitating vibration. 60 comprising a frame adapted for movement Ain
At the same time, the provision of the longitu
said trench and having a lower cylindrical por
dinal ribs 53 in the frame forms a 'support for the
tion, a reduced diameter cylindrical rotatable
free or unjournaled end of the cylinder to limit
member concentric with said frame cylinder and
the extent or amplitude of the vibrations and to
cooperating therewith to deiine an annular
limit the stresses applied to bearing 44 by the
chamber, and means for feeding plastic material
vibration. The high speed rotation of shaft 6l]
to and rearwardly through said chamberv into
and the incident vibration generates heat, and
said trench, said cylindrical member including
consequently the filling of the forward end of the
an elongated portion formed `of relatively rotat
cylinder with a liquid, such as oil, serves as a
heat transfer means to hold the heat at'bearing
able articulated sections normally in frictional
end engagement adjacent their circumference
projecting rearwardly from said frame to con
transmit the heat to the cylinder walls to heat the
tinuously interiorly support said mix While the
latter sets in said trench.
A concrete mix requires a certain minimum 75
2. Afmachine for forming a pipe in laïtrench,
surfaces, etc., within safe limits and to uniformly
mix.
f
°
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comprising a frame having a rearwardly project
ing tubular portion, a rotatable inner form with
in said tubular portion defining a tubular cham
ber, meansfor rotating said form, an external
feed screw on'said inner form, plastic feed means
communicating-with said chamber, and a longi
comprising a frame adapted to be advanced in
said trench and having a lower longitudinal pas
sage, an inner form’rotatable within-said'pas
sage and cooperating therewith to denne a tubu
lar chamber, -means for feeding plastic material
to and rearwardly through said chamber into said
trench, and an elongated‘non-collapsible flexible
tudinally shiftable ram for packing earth around .
said tubularl frame portion.
trailing member in torque transmitting end en
8. A machine for forming a pipe in atrench,
gagement with said rotatable form and project
ing rearwardly from said frame to interiorly sup 10 comprising a frame having a rearwardly project
ing tubular portion, aninner form in said tubular
port-said mixrwhile the same sets in said trench,
portionV cooperating therewith to define a tubular
said trailing member> including a plurality of
chamber, means for feeding plastic material to
articulated> relatively rotatable, cylindrical por;-v
and rearwardly' through-said chamber, a trans
tions in torque transmitting end'engagement.
k3. A machine for forming a pipe in a trench, 15 verse substantially vertical ram, and> means for
longitudinally reciprocating said ram to pack
comprising a frame adaptedto be advanced .in
earth around said tubular frame portion and
said trench and having a lower longitudinal pas
thereby advance said frame.
ì
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sage, an inner form rotatable< within said-pas
»9. A machine for forming a pipe in a trench,
sage and cooperating therewith to define a tubu
lar chamber, means for feeding plastic material 20 comprising a frame having a rearwardly project
ing tubular portion, an inner form in said tubular
to and rearwardly through said chamber into
portion cooperating therewith to deñne a tubular
said trench, and an elongated flexible trailing
chamber and including a portion projecting rear
form of substantially uniform cross .section in
wardly from said frame, Ya transverse substan
cluding a plurality of relatively rotatable articu
lated rigid units connected to and in rotation 25 tially Vertical ram plate, a transverse cam shaft
journaled in said frame, means for rotating said
transmitting engagement with the rear end of
shaft, longitudinal bars so arranged as to be
said inner form.
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shifted by said shaft and connected to said ram
4. A machine for forming a pipe in a trench,
plate, said ram plate reciprocating longitudinally
comprising a frame adapted to be advanced in
said trench, and having a lower longitudinal 30 on said tubular frame portion to compact back
i‘ill therearound, and means for feeding plastic
passage, an' inner form within said passage and
material through said chamber and compacting it
cooperating therewith to deñne a tubular cham
around said inner form rearwardly of said frame.
ber, means for feeding plastic material to and
l0. In a machine for forming a pipe in a trench,
rearwardly through said chamber into said
trench, and an elongated flexible trailing form
35 a frame, a hopper carried by said frame, a longi
tudinal tubular portion at the bottom of said
of substantially uniform cross section in fric
frame projecting rearwardly therefrom and com
tional end abutment withV said inner form and
municating with said hopper, a substantially
including a plurality of similar rigid tubular
vertical transverse ram plate bearing on said
units each having a reduced portion fitting in
frictional torquetransmitting relation to an ad 40 tubular portion rearwardly of said hopper, means
carried by said frame for longitudinally recipro
jacent unit and an elongated flexible draft mem-_
cating said ram plate to compact backñll de
ber passing through said units with its opposite
posited around said tubular portion, said plate
ends connected to said inner form and to said
rearmost unit.
.
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and means advancing said frame as backfill is
'
deposited therebehind, and an inner pipe form in
5. A machine for forming a pipe in a trench,
comprising a frame adapted to be advanced in
said trench and having a lower longitudinal pas
sage, a cylindrical form _journaled in said pas
sage and cooperating therewith to deñne a tubu
Asaid tubular portion and projecting rearwardly
therefrom for shaping >the interior of a pipe
formed from material discharged from said
hopper.
1l. A machine for forming a pipe in a trench
lar chamber, a feed screw in said chamber car- .
comprising a «frame’adapted to be advanced in
said trench, an outer form carried by the bottom
of said frame, a cylindrical inner form rotatably
mounted within said outer form to denne a tubu
ried by said form, means for rotating said form,
means for feeding plastic material intov said
chamberv for discharge'intofsaid trench ‘by said
screw, and an elongated, ñeXible'non-collapsible
larchamber therein, a'helical feed member ñxed
form in frictional end engagement with and .
to and encircling a portion Yof said inner form,
means for feeding plastic> material to said cham
ber, a shaft iournaled longitudinally in said inner
drawn> by said first form to continuously inte
riorly support said plastic material in said‘trench
as it sets said last named form including-a plu
rality of relatively rotatable cylindrical sections
in frictional torque transmitting end to end en
gagement.
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form, an unbalanced weight carried by said shaft
60 within said form, means for rotating said inner
form, and means for rotating said shaft and
,
weight at higher speed than the speed of rotation
>6. A machine for formi-ngrapiperinra trench;
comprising
a
frame adapted " for
of said inner form to vibrate said inner form12, A machine for forming a pipe in a trench,
movement
through said trench‘and' having> 'a lrearwardly
projecting tubular portion, an inner form within
said tubular portion' deñning'a tubular chamber
in said frame, said inner form including a uni
- comprising a frame having an outer form iixedly
carried by and projecting rearwardly from the
lower portion of said frame, a transverse sub
stantiallyY vertical lram plate above said outer
form, means for longitudinally reciprocating said
ram plate'to compact backflll around said outer
form rearwardly trailing ` portion, a ram re
ciprocable longitudinally of said frame for pack
lng earth around said tubularframe portion, and
form, an inner form mounted within said outer
form to denne a tubular chamber therein, means
means for feeding plastic material to and through
said chamber for discharge between said trailing
for feeding plastic material to and through said
chamber, and means for vibrating said inner
form portion and said packed earth rearwardly
of said frame.
'
‘7. A machine for forming
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pipe'in `alt-trench,
75
form.
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2,406,025
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13. A machine for forming a pipe in a trench,
form a tubular chamber, means for rotating said
form, an articulated cylindrical form trailing and
comprising a frame having an outer form ñXedly
carried by and projecting rearwardly from the
lower portion of said frame, longitudinally re
ciprocable ram means for compacting backñll
around said outer form, an inner form journaled
within said outer form to define a tubular cham
ber therein, a feed screw ñxed to and encircling
said inner form, means for supplying plastic
material to said chamber, means for rotating said
inner form, and means for vibrating said inner
providing a continuation of said cylindrical form,
means reciprocating substantially horizontally for
compacting earth around said rearwardly pro
io
brating said rotatable form.
18. A machine for forming pipe in a trench,
comprising a frame adapted to traverse a trench
and having an elongated longitudinal passage
deiined in part by a tubular portion projecting
form.
14. A machine for forming a pipe in a trench,
comprising a frame having an outer form ñxedly
carried by and projecting rearwardly from the
lower portion of said frame, longitudinally recip
rearwardly from the lower portion of said frame,
rocable ram means for compacting backñll around
said outer form, an inner form journaled within
said outer form to define a tubular chamber
therein, a feed screw ñxed to :and encircling said 20
inner form, means for supplying plastic material
to said chamber, means for rotating said inner
form, and means for vibrating said inner form,
said inner form including an elongated flexible,
non-collapsible portion projecting rearwardly of
said outer form.
15. A machine for forming pipe in a trench,
comprising a frame adapted to be advanced in
jecting frame portion as said frame advances, a
feed screw in said chamber carried by said ro
tatable form, means for feeding plastic material
to said chamber, and means for transversely vi
means reciprocating substantially horizontally for
compacting earth around said passage as said
frame advances, means for feeding plastic ma
terial to and rearwardly through said passage,
an inner pipe form within said passage and in
cluding a uniform portion projecting rearwardly
from said passage, said plastic material being
discharged and shaped between said inner forms
and said compacted earth rearwardly of said
frame.
19. A machine for forming a pipe in a trench,
comprising a frame adapted to traverse said
trench and having a rearwardly projecting form
said trench and having an outer form in the lower
at the lower portion thereof, longitudinally recip
portion thereof, an inner form rotatable in and 30 rocable means for compacting backfìlled earth
projecting from said outer form and cooperating
around said form, an inner form within said outer
therewith to define a tubular chamber, means for
form and projecting rearwardly therefrom, means
feeding plastic material to and rearwardly
for discharging plastic material around said in
through said chamber, said inner form having an
ner form rearwardly of said frame, and means
opening therein intermediate the length thereof,
means for feeding a flexible reinforcing member
to and through said opening including an open
ended passage extending axially of said inner
form and curved at one end for registration with
said opening, and means for rotating said inner`
form.
16. A machine for forming pipe in a trench,
comprising a frame adapted to be advanced in
said trench and having an outer form fixed in
the lower portion thereof, a tubular inner form
journaled at its forward end portion within said
outer form and cooperating therewith to deñne
a tubular chamber, means for feeding plastic ma
terial to :andrearwardly through said chamber,
a longitudinal open ended hollow shaft journaled
in said inner form, an unbalanced weight fixed on
said shaft, said inner form having an opening
therein rearwardly of said shaft, means for feed
ing a flexible reinforcing member through said
hollow shaft and thence laterally through said
opening, means for rotating said inner form, and
means for rotating said shaft.
,
17. A machine for forming a pipe in a trench,
comprising a frame adapted to traverse said
trench and having a longitudinal passage at its
bottom deûned in part by a rearwardly project
ing tubular portion, a rotatable cylindrical form
within said passage and cooperating therewith to
for maintaining said frame upright in said trench.
20. A machine for forming a pipe in a trench,
comprising a frame adapted to traverse said
trench and having a rearwardly projecting form
at the lower portion thereof, longitudinally recip
rocable means for compacting backñlled earth
around said form, an inner form within said outer
form and projecting rearwardly therefrom, means
for discharging plastic material around said in
ner form rearwardly of said frame, a vertical mast
' carried by said frame, and guy cables carried by
said mast and anchored at points spaced from
said trench for maintaining said frame and mast
upright as said frame advances.
21. A machine for forming pipe in a trench,
comprising a frame having an outer form in the
lower portion thereof, an inner form rotatable in
and projecting from said outer form and coop
erating therewith to define a tubular chamber,
means for feeding plastic material to and rear
wardly through said chamber, means for feed
ing a reinforcing member into said chamber in
cluding a passage extending axially of said inner
form with its forward end open to receive said
member and terminating in a lateral portion
opening through said inner form, and means for
rotating said inner form.
HERMAN L. MOOR.
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