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Патент USA US2109421

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' Feb. 22, 193s.
Filed May 2e, 19:54
Patented Feb. 22, 1938
Charles Cyril Iialkyard, Melbourne, Australia, ,
assigner to Hume Pipe Company (Australia) ‘
Limited, Melbourne, Australia
i‘ ` Application May 26, 1934; Serial No. 727,817
‘ In Australia June 15, 1933
’ x
2 Claims. v (Cl. 25--30)`
This invention relates to the molding of con-
tially Compacts >Seine in its-ennuie? ÍOI‘In. The
crete pipes and the like including the lining of
screeding member .is then removed and the mold
metal or other pipes with concrete >cr like mate-
or fcasing is” subjected to` combined centrifugal
The speciñcation of UnitedStates Patent No.
and jolting actions by means of a suitable appa
ratus provided for the purpose. I
2,023,381 describes a method and'apparatus ac-
It has been found that by retaining the screed
ccrding to which the molding‘and lining of pipes
with concrete is'effected by subjecting thecon-
ing member Within the InOld during the initial
rotatiOn and Charging thereof, the Subsequent
combined centrifugal vand jolting process causes
crete mixture in a semi-dry or non-liquid'state
10 simultaneously to centrifugal force and to a pro- `
nounced jolting or ccncussional action within a
rotating mold or casing which is intermittently
and abruptly projected upwardly from its normal position of rotation and returns forcibly
15 thereto during such rotation.
In accordance with the abovementioned process, the mold or casing is initially rotated with-
the distributed and partially compacted semi-,dry 10
Concrete mixture to be uniformly’and effectively
Consolidated throughout the length and Circum
ference of the mold. Furthermore, relatively
Small quantities 0f the Semi-dry material may
be introduced and compacted where necessary to 15
‘fill up any depressions or inequalities in the
inner surface ofthe concrete pipe 01‘ lining. In
out the jolting a’ction whilst the concrete mix-
this respect, it has been found hitherto that any v
ture is being fed into the mold.
such additional material which may be intro
Owing to its
20 semi-dry or non-liquid consistency, the concrete
duced for thisgpurpose tends to remain loose 20
is not capable of flowing or spreading longituaround the interior of the pipe and forms a rough
'dinally within the mold as is the 'case when the
or irregular surface.
concrete is employed in the usual liquid or semi- '
Referring to the drawing which forms part of
liquid state in the molding of concrete pipes by
this specification-
the centrifugal-process. For this'r'èason, it is Y Figure l is a longitudinally contracted side 25
'necessary to evenly spread or distribute the
elevation of apparatus according to one embodi
semi-dry material into annular form within the , ment of the invention.
mold before subjecting it to the aforesaid comFigure 2 is an end view' of Figure 1.
bined centrifugal and joltlng action. >Such even
In the drawing the numeral 2 indicates a mold.
30 spreading or leveling of the concrete is essential
provided with the usual endrings 3 which nor- 3o "
Vgto the production of a pipe of uniform diameter
y ' _and thickness and maximum density.
mally rests upon runner wheels 4 mounted on c r’
shafts 6 supported by bearings l on a framework
'In accordance with a preferred form of the
invention, a screeding or leveling member, con35 sìsting of a straight length of tubing or' circular
section bar, is placed in position within the mold
or casing so as to extend longitudinally therein
prior to the charging of the mold with the con-
8. Suitable means, such as disclosed for instance>
in prior United States Patent'No. 2,023,381, may
be provided to impart pronounced jolting or con- 35
cussional action to the mold while it .is -being
rotated at high speed by the runner wheels I.
In Figures l and 2 the screeding member is
crete mixture. Whilst the screeding member is
40 held in position either manually or by suitable
shown in the form of a straight tube 9 which
extends completely'through the mold and is sup- 40
mechanical means as hereinafter described, the
' ported so as to be spaced slightly inwards froml
material is fed into the mold which is rotated at
a relatively low speed, the result being that the
the usual inwardly projecting flanges 3a of the
mold end rings 3. Supporting means for the
semi-dry material is evenly spread or distributed
screeding tube may include pairs of ` laterally
45 by the screeding member into substantially an:
nular form throughout the length of the- mold.
spaced end brackets il' secured to framework 8 454
and carrying laterally extending sub-frames I2
When substantially the whole of the charge of . t0 which upstanding arms or bearers I3 are re
concrete has been thus introduced into the mold
and initially spread therein by the screeding
50 member, the latter is allowed to’rotate while vthe
rotation of the mold is continued at' relatively
low speed.
whereby the leveling
member exercises rolleil pressure simultaneously
upon the entire length of the charge and ensures
55 uniform distribution of the material and pai‘-
tained. These bearers are preferably vertically
adjustable and for this purpose may havea ver
tical slot I4 or a> series of vertically spaced holes 50
to pass bolts I6 which retain them to the sub
frames l2.
Each bearer is provided atlits upper end with
a plate ll having an open sidedrecess I8 of ap
_proximately semi-circular shape to accommodate `55 '
the screeding tube 9 so that it may rotate while
bei-ng supported in operative position.
drawable stop pins I 9 or collars may be asso
ciated with the screeding member 9 to prevent
Ul endwise movement thereof' when in operative
The screeding tube is placed'in operative posi
tion as in Figures 1 and 2.
The semi-dry or non
ilowing material is introduced into the mold
10 and the latter. is rotated in the direction of the
arrow in Figure 2.
The recesses Il of the plates
Hare so disposed relative to the direction of ro
tation of the mold that the contact of the screed
ing tube 9 with the material within the rotating
mold maintains the tube within the' recess while
enabling it to rotate and exercise a rolling- action '
member, and means for supporting same where
by it extends lengthwise from end to end within
the mold in spaced relationship with the internal
surface thereof so that, during rotation of the
mold, the leveling and pressure member exercises 5
a rolling action upon the mixture in order to
evenlyspread or distribute it lengthwise and cir
cumferentially .throughout the mold into the
form of a partially compacted annulus ready for
consolidation by combined concussion and cen 10A
trifugal actions, the supporting means for said
levelling and pressure member comprising up
standing arms or bearers located one at each end
of the mold Aand provided with seatings for de
tachably receiving said member, said seatings
being provided with open-sided recesses for ro
upon the material which facilitates distribution -\
accommodating the end portions of the
and initial compacting of the material. After tatably
the material has thus been distributed the screed
ing tube may be withdrawn lengthwise from the
mold and the latter then subjected to combined prising a rotary mold, a supporting frame, means 20
jolting or concussional and centrifugal actions as on said frame for supporting and rotating said
before -referred to to complete the‘manufacture mold about a horizontal axis to centrifugally ap
ply a concrete mixture to the interior thereof, a
of the pipe or lining.
Having now described myv invention what IA
claim as new and desire to `secure by Letters
Patent is-
1. In apparatus for use in the manufacture or
lining of pipes from semi-dry or non-flowing con`
crete mixture, a rotary mold, means for rotating
the mold to centrifugally apply the mixture to the
n interior thereof, a rotary leveling andpressure
rotary pressing- and leveling member extending
longitudinally- through said mold, a support for
said member positioned at each end ofthe mold,
each support comprising a seat for >rotatably ac
commodating -the end portions of said member
and provided with an open side for the >introduc
tion and removal of said member, and means for 30
adjustably securing »said supports to said frame.
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