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Dec. 24, 1946.
‘A. 1.. FORBES, JR: -
Filed Oct. 26, 1944
34 4
" a?”
3 Sheets-Sheet 1
Dec. 24, 1946. '
Filed Oct. 26, 1944
3 Sheets—Sheet‘ 2
Hm. '24, 1946.
Filed Oct. 26, 1344
3 Sheets-Sheet 6 1
Patented Dec. 24, 1946
Arthur L. Forbes, Jr., Houston, Tex., assignor to
Pressure Weld Company, Houston, Tex., a cor
poration of Delaware
Application October 26, 1944, Serial No. 560,473
2 Claims. (Cl. 113-103)
This invention relates to an expanding head,
particularly adapted for use in the process of
designated as the frame of the head and, of
course, may be varied in speci?c construction.
welding pipes together.
Around this frame are the shoes 6, four of said
The head has been particularly designed for
shoes being shown. They are of arcuate shape,
use in the construction of pipe lines whose sec 5 their outer surfaces being curved to conform to
tions are welded together.
the desired inside contour of the pipe-that is,
Another object of the invention is to provide
the outer surfaces of the shoes, when the head
an expanding head of the type described which
is expanded, are of a cylindrical contour.
is adapted to be located within the adjacent ends
_ Each shoe has a plate like web '1 which ex
of the pipes to be welded together and which in 10 tends radially inwardly between the plates of the
cludes means for expanding the head against said
frame as more accurately shown in Figure l.
adjacent ends so that the ends will be brought to
The frame plates have the marginal register
perfectly round shape, if out of round, in order
ing slots 8 and 9 as shown in Figures 1 and 4.
that the ends to be welded together will per
The slots 8 are somewhat wider, and extend some
fectly register.
A further object of the invention resides in
novel means for expanding the head.
It is a further object of the invention to pro
vide, in a head of the character described, re
15 what further radially inwardly, than the slots 9.
The webs ‘I also have the marginal slots III which
register with the slots 9.
Fastened to the webs '! on opposite sides of the
slots I0 thereof and extending outwardly through
tractable stops provided to accurately locate the 20 the slots 8 are the pairs of lugs II, II, the lugs
head with respect to the joint between the pipe
' of the respective pairs being spaced apart. Tog
sections with means for retracting the stops upon
gle links I2 have their outer ends pivoted between
initial expansion of the head.
the respective pairs of lugs II and have their
With the above and other objects in view the
inner ends pivotally connected to a. hub I3. This
‘ invention has particular relation to certain novel 25 hub is ?xed on a plunger rod I4 whose inner
features of construction, operation and arrange
ment of parts, an example of which is given in
this speci?cation and illustrated in the accom
panying drawings, wherein
end slides through the bushing 4 and a strong
coil spring I5 surrounds said rod and is inter
posed between the frame and the hub I3 and
normally holds the hub outwardly thus holding
Figure 1 shows a longitudinal, sectional view 30 the shoes 6 inwardly or in retracted position.
of the head.
The hub I3 and spring I5 are surrounded by a
Figure 2 shows an enlarged, fragmentary, sec
housing I I5 which may be .bolted to the frame and
tional view of the pressure applying means for
whose outer end is formed with a central bear_
retracting the stops and expanding the head.
ing through which the plunger rod I4 works.
Figure 3 shows an end view of the head.
35 The housing I6 has suitable side slots I’! through
Figure 4 shows a sectional view taken on the
which the toggle links I2 may work.
line 4—4 of Figure 1; and
- Fastened to the outer end of the housing I6
Figure 5 shows a plan view of the head located
there is a cylinder I8 within which there is a
in the pipe line and shown in active, or expanded,
plunger I9 connected to the outer end of the
40 plunger rod I4. Connected into the outer end of
Referring now more particularly to the draw
the cylinder l8 there is a suitable pressure line
ings, wherein like numerals of reference desig
20 through which a pressure ?uid such as oil
nate the same parts in each of the ?gures, the
may be admitted into the cylinder I8.
numerals I and 2 designate inner and outer plates
Upon application of pressure to the plunger I9
which are arranged concentric. There is a tu 45 it is obvious that it will be forced inwardly over
bular nipple 3, concentric with and extended
coming the pressure of the spring I5 and operat
through both plates. It is welded to the plate
ing, through the toggle links I2, to_expand the
2 and extends through and beyond the plate I.
shoes of the pressure head.
Its extended end is outwardly threaded. A tu
Bolted, or otherwise secured, to the frame plate
bular bushing 4 is extended through the nipple 50 I, there is a, hood 2| which surrounds and en
and is screwed onto the threaded end of the
closes the'corresponding end of the bushing l
nipple and is formed with a head which abuts
and the plunger rod I 4.
the outer side of the plate I. Around the nipple
Fastened to the innerend of the hood 2I there
and between the plates there is an annular spacer
is a cylinder 22 reciprocable in which there is
5. The ‘ parts hereinabove referred to may be 55 a plunger 23 and fastened to this plunger and
surrounding the outer end of the cylinder 22 there
with a circumferential groove 40 to provide space
is a cap 24 having an outwardly extended inner
for the up set material.
The pressure fluid may be supplied from any
end ?ange 25.
Connected into the inner end of the cylinder
22 there is a valve housing 26 having an inlet
suitable source. When the pressure is relieved
the spring I5 will force the plunger I9 outwardly
passageway 21 which is controlled by the inlet
valve 28 normally held closed by a pressure spring
29. A line 30 leads from the outer end of the cyl
or in the reverse direction thus acting through
the toggle links I2 to withdraw the shoes 6 in
wardly and thus contract the head and the pull
inder I8 and is connected into the inlet passage
of the springs 31 will move the plunger 23 in
wardly of its cylinder 22 thus forcing the pressure
way 21, as shown in Figure 2. The inlet pas
sageway 21 also forms a relief passageway which
is controlled by~the relief valve 30a. The pur
pose and operation of these valves will be here
inafter more speci?cally explained.
?uid back through the duct 21, past the relief
valve 30a and through the branch line 30b and
back through the line 30.
The head may then be withdrawn through the
On opposite sides of the slots 9 and secured to 15 added section 39 until it is in the same relation
the frame plate I are the pairs of arms 3|, 31
to said added section, as is shown in Figure 1 and
more accurately shown in Figures 1 and 3. The
another section added as before. The pressure
arms of each pair are spaced apart and pivotally
line 20 may be ‘used for withdrawing the head
mounted between them are the stop members 32,
and this line may be either a pipe or a hose of
shown more accurately in Figure 1. These stop 20 sufficient strength for the purpose.
members are curved outwardly through the slots
The head is provided with a carriage to facili
9 and I0 and their outer ends projected through
tate its withdrawal through the added section 39.
corresponding openings 33 in the shoes 6, and for
This carriage includes the rear wheels 4I mounted
the stops 34 whose forward sides are beveled, as
between the arms 3I _as well as the front wheels
shown in Figure 1. Formed integrally with the
42 which are mounted between the forwardly
pivoted ends of the stop members 32 are the arms
extended arms 43 which are anchored to the front
plate 2 of the frame.
35 which extend radially inwardly and whose
inner ends engage behind the ?ange 25 as shown
What I claim is:
in Figure 1. These arms are connected to the
, 1. An expanding head for registering the adja
hood 2I by means of the yieldable members 36 30 cent ends of aligned pipes to be welded together
and the ?ange 25 is connected to said hood by the
and for reshaping said ends, if distorted, com
yieldable members 31. These yieldable members
prising, a frame composed of concentric plates,
36, 31 are preferably in the form of coil springs.
means for ?xing said plates in spaced relation, a
Normally the spring I5 will hold the shoes 6
series of expanders mounted to move radially on
retracted, or in their inner position, and the
the frame and having curved outer faces arranged
springs 36 will hold the stops 34 outwardly or in
to move simultaneously into contact with the in
active position. The head may be inserted into
side of the pipe ends, upon‘outward movement
the end of the pipe line 38, or other pipe to which
of the expanders, said faces when expanded de
a section is to be welded. The stops 34 will engage
?ning an approximately cylindrical contour, webs
the end of the pipe line so as to regulate the dis 40 ?xed to the expanders and extending radially in
tance of insertion. As is indicated in Figure 1
wardly between the plates, means responsive to
the shoes should be inserted about one-half of
the pressure of an operating ?uid for moving the
their length into the pipe line. The section 39
expanders outwardly to move said faces into con
to be welded on may then be brought into align
tact with the inside of the adjacent pipe ends
ment with the section 38 and its end, adjacent the
and means for moving the expanders inwardly
pipe line, or section, 38 moved over the shoes 6
to released position upon relief of said pressure.
into the position indicated in dotted lines in
2. An expanding head for registering the adja
Figure 1. Pressure may then be ‘applied through
cent ends of aligned pipes to be welded together
the line 20 into the cylinder I8 and this pressure
and for reshaping said ends, if distorted, compris
will pass also through the branch line 30b. The
ing, a frame composed of approximately concen
spring 29'may be made of any desired strength,
tric members, means for ?xing said members in
usually it is of a strength to require about ?fty
spaced relation, a series of expanders mounted to
pounds pressure to open the valve 28 and admit
move radially on the frame and having outer
pressure intoithe cylinder 22. This initial pres
faces arranged to move simultaneously into con
sure will operate through the toggle links I2 to 55 tact with the inside of the pipe ends upon out
cause the shoes to contact the opposing ends of
ward movement of the expanders, said faces when
the respective pipes 38 and 39 and will force the
expanded de?ning an approximately cylindrical
plunger 23 and cap 24 outwardly thus acting
contour, webs ?xed to the expanders and extend
through the arms 35 to retract the stops 34. The
ing radially inwardly between said members,
section 39 may then be forced into direct contact
radially movable retractable stops on the head
with the end of the pipe line 38 by a pipe welding
which extend out beyond the head when the ex
machine, or other appliance, adapted for the pur
panders are in their inner position, means re
pose and as the pressure in the cylinder I8 is
sponsive to the pressure of an operating ?uid for
further built up the shoes will be further ex
moving the expanders outwardly to move said
panded and will bring the abutting ends of the 65 faces into contact with the inside of the adjacent
pipes into perfectly round shape, if out of round.
pipe ends, means for automatically retracting
The abutting ends may then be welded together
said stops upon such movement and means for
by the application of heat from the welding ma
moving the expanders inwardly to released posi
chine referred to. When the weld is completed
tion upon relief of the pressure.
the ends of the pipe welded together will be
slightly up set inwardly and the head is provided 70
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