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April 19, 1949.
L. R. o’NElLL
WELDING APPARATUS
Filed Oct. ll, 1948
2,467,628
Patented Apr. 19, 1949
2,467,628
UNITED STATES PATENT OFFICE
2,467,628
1
WELDING APPARATUS
Louis R; Ó’Ñeill', Warren, Ohio
Application October 11, 1948, Serial No. 53,831
’7 Claims. (Cl. 2'19’~4)
2
This invention relates to welding ap-paratus and
more particularly' to electric resistance welding
apparatus of the spot welding type.
The principal object of the invention is the
provision of an improved spot welding apparatus
of the portable type.
by a plug I3 threadably engaging a thread pat
tern formed in the cylindrical body member I0
and inwardly from the ends thereof. The plug
I3 is drilled axially to form a passageway for a
piston rod I4.
A piston head I5 is formed on one end of the
piston rod Iâ and registers in the chamber II.
The piston and piston rod are formed of suit
able material such as 18-8 stainless steel. A
cap I6 threadably engages the end of the cylin
drical body member I0 to form a closure for the
chamber II and> is provided- with a drilled and
A further object of the invention is the pro
vision of a portable spot welding apparatus in
cluding structure arranged to maintain the elec
trodes thereof in positive alignment with one
another.
A still further object of the invention is the
provision of a portable welding apparatus of a
tapped orifice I'I through which fluid pressure
is adapted to be delivered to the device for' actu
ating the same.- The other end of the piston rod-
simple lightweight form capable of relatively easy
fabrication and assembly.
A still further object of the invention is the
III extends outwardly and beyond the other' end
of the cylindrical body member I'Il Where it is
provision of welding apparatus of the resistance
type having means for alternately mounting vari
Secured to a yoke-like extension' I8 of a sleeve
ous lengths of electrode carrying arms so that the
apparatus may be adapted for various workpiece 20 like member I9 formed of non-magnetic mate
applications.
rial. The inner diameter of the sleeve-like mem
ber I9 corresponds with the outer diameter' o‘f
The portable electric resistance welding appa
the cylindrical body member I0 with appropriate
ratus disclosed herein 4comprises a device incor
porating means for applying forging pressure to
mechanical clearance so that the sleeve-like mem-ber I9 can slide back and forth on the cylindri
workpieces to be welded and at the same time
provides for the direction of an appropriate elec
trical current through the workpieces so that a
25
cal body member IU'. A key 2U is attached to a
portion of the sleeve-like member I9 and regis
satisfactory weld is made.
ters with a longitudinally extending slot 2l
formed in the cylindrical body member IU and
With the foregoing and other objects in view
which will appear as the description proceeds, 30 in the end thereof deñning the chamber I2 as
the invention resides in the combination and ar-`
heretofore referred to. The connection between
rangement of parts and in the details of con
struction hereinafter described and claimed, it
being understood that changes in the precise em
bodiment of the invention herein disclosed can
be made within the scope of what is claimed
without departing from the spirit of the inven
tion.
The invention is illustrated in the accompany
ing drawing, wherein:
Figure 1 is a cross sectional side elevation of
the portable welding apparatus.
Figure 2 is a plan View on line 2--2 of Fig
ure 1.
the outer end of the piston rod I4 and the yoke
lik'e extension I8 of the sleeve-like member I9
comprises a shoulder 22 formed on the piston rod
for registry with the inner surface of the yoke
I 8. The outer end of the pistón rod I4 is thread
ed and a fastener such as a nut 23 is secured
thereto against the outer face of the yoke I8. It
will thus be seen that any motion on the part of
40 the piston I5 and the piston rod Ill will be im
parted to the yoke i8 which in turn will move
the sleeve-like member IS longitudinally on the
cylindrical body member I0. The other end of
the cylindrical body member I'ß has an annular
By referring to the drawing and Figure 1' in 45 section 24 of reduced diameter for the recep
particular it Will be seen that the electric Weld'
tion of an insulating bushing 25 andv a frame
in'g apparatus comprises an assembly of simply
member 26 which is preferably formed of non
machined and assembled _parts includingl a cylin
magneticy material and in the manner of a G
drical> body member ID formed of suitable ma
clamp so that it can be tightened into position on
terial such as 18~8 stainless steel having a cham 50 the cylindrical body member I0 and electrically
ber II in one end thereof and a` seconda-ry cham
separated therefrom by the insulating bushing
ber I2 in the other end thereof. It will be ob
25.
served that the chamber II is" of smaller diam
The frameA member 25 has a sideward exten
eterï than the' -chamber I2l and that the" cham
sion 21 which in turn has drilled and tapped
bers I I and I2 are separated from one- another 55 orifices 28 therein by means of which one end
2,467,628
3
of a flexible electrical conductor (not shown)
may be connected thereto. Alhandle 29, shown
in dotted lines in Figure 1 of the drawings, may
be alternately secured to the outer face 3D of the
extension 21 or to the side thereof in which the
orifice 28 is formed, as desired, -so that the weld
ing apparatus may be conveniently manipulated
thereby. The sleeve-like member I9 is also pro
vided with drilled and tapped oriñces I9’ simi
lar to the orifices 28 heretofore referred to so 10
that a .secondary electrical conductor may be con
nected thereto and a welding circuit established
would Ipermit the electrodes 36 and 31 to move out
of -predetermined alignment.
By again referring to Figure 1 of the drawings
it will [be seen that a coil spring 39 is disposed
about the piston rod i4 and between the inner
surface of the yoke i8 and the plug I3 so as to
normally bias the yoke I8 outwardly with respect
to the cylindrical body member Il). In connection
with the plug I3 it will be observed that glands
are provided between the plug body and the rod
i4, as indicated by the numeral 40, and between
the plug body and the chamber l I as indicated by
the numeral el. A wiper 42 is mounted on the
sleeve-like member I9 for maintaining the exte
source of electrical current.
The means for clamping the frame member 26 15 rior surface of the cylindrical body member I0 in
suitable condition for the reciprocal travel of the
in location on the cylindrical body member I6
sleeve-like body member I9.
may comprise bolt and nut assemblies 3I as
It will thus be seen that a simple and eñicient
illustrated in Figure 2 of the drawings and which
between the welding apparatus and a suitable
engage the spaced portions of the C-like frame
portable electric resistance apparatus has been
member 26 so that the inner diameter thereof 20 disclosed which meets the several objects of the
invention.
may be reduced by tightening the bolt and nut
Having thus described my invention, what I
assemblies 3l. The sleeve-like member I9 and
claim is:
the frame member 26 have oppositely disposed,
l. An electric resistance welding apparatus of
aligned extensions 32 and 33, respectively, slotted
portions of which comprise means for the detach 25 the type in which the apparatus serves as a means
for applying pressure to the parts to be welded
able connection of a pair of oppositely disposed,
and including a body member having a chamber
aligned, electrode :carrying arms 34 and 35, re
formed therein, means for introducing fluid pres
spectively. In Figure 1 of the drawings the arms
sure into said chamber, a piston in said chamber
34 and 35 are shown to be relatively short and
to carry electrodesl 36 and 3l in a conventional 30 having a rod connected thereto and extending
outwardly of the said body member, a secondary
manner.
body member of cur-rent conducting material
` It will be obvious to those skilled in the art
positioned around the exterior of the ñrst men
that the length and configuration of the arms 34
tioned body member for reciprocal movement
and 35 may be changed from that illustrated
herein, for example, so that they are considerably 35 thereon and connected to the said piston rod lfor
longer and thereby capable of engaging work
pieces to be welded at a greater distance from
the cylindrical body member lil than that illus
movement thereby, a frame formed of current
conducting material positioned on the said body
member and insulated therefrom, and means on
the said `secondary body member and on the said
trated herein. The electrodes 36 and 31 are
adapted for the -cir-culation of a coolant there 40 frame in oppositely disposed aligned relation for
receiving welding electrodes.
through as is also customary in the art. The
2. An electric resistance welding apparatus of
handle 29 is provided with a trigger 38 for the
the type in which the apparatus serves as a means
remote actuation of controlling devices (not
for applying pressure to the parts to be welded
shown) as known in the art by means of which
and including a cylindrical body member having
45
hydraulic pressure may be introduced linto the
a chamber formed therein, means for introducing
orifice I1 as by way of a suitable connecting flex
ñuid -pressure into said chamber, a piston in said
ible tube and by means of which a welding current
chamber having a rod connected thereto and ex
may be connected to the sleeve member I9 and its
tending outwardly `of the said body member, a
electrode 36 and the frame 26 and its electrode 31
to the end that a satisfactory resistance Welding 50 sleeve-like member or" current conducting mate
rial positioned on the exterior of the cylindrical
operation may be performed.
body
member for reciprocal movement thereon
It will thus be seen that a portable welding
and connected to the said piston rod for move
apparatus of the electric resistance type has been
ment thereby, a frame formed of current con
disclosed which comprises a simply formed and
ducting material positioned on the said cylindrical
assembled structure and which possesses certain
body member and insulated therefrom, and means
inherent advantages and particularly with respect
on the said sleeve-like member and on the said
to the maintenance `of the electrodes 36 and 31 in
frame in oppositely disposed aligned relation for
predetermined desirable alignment with one an
receiving welding electrodes.
other. Asis known in the art, one of the common
3. An electric resistance welding apparatus of
objections in portable electric resistance type 60
the type in which the apparatus serves as a
Welders has been the inability to maintain align
means for applying pressure to the parts to be
ment between the electrodes and/or their side
welded and including a cylindrical body member
having a chamber formed therein, means for in
tioned therebetween during the times when forg
ing pressures are applied to the workpiece through 65 troducing iiuid pressure into said chamber, a
piston in said chamber having a rod connected
the electrodes.
thereto and extending outwardly of the said body
It will occur to those skilled in the art that the
member, a sleeve-like member of current con
cylindrical body member II) provides an unusually
ducting material positioned on the exterior of
sturdy base for the mounting of the sleeve-like
member I9 and the frame member 26 which in 70 the cylindrical body member for reciprocal
movement thereon and connected to the said
turn carry the electrodes 36 and 31. The mount
piston rod for movement thereby, a frame formed
ing of the sleeve-like member I9 on the cylindrical
of current conducting material positioned on the
body member ID contributes to the inherent rigid
said cylindrical body member and insulated
ity of the structure and its ability to resist any
tendency towards buckling or bending which 75 therefrom, means on the said sleeve-like mem-`
ward movement with Irespect to workpieces posi
2,467,628
ber and on the said frame in oppositely disposed
aligned relation for receiving welding electrodes,
and spring means normally urging the said
sleeve-like member away from the said frame.
4. An electric resistance welding apparatus of
the type in which the apparatus serves as a
means for applying pressure to the parts to be
welded and including a tubular body member
6
and on the said circular frame for receiving
welding electrodes, and spring means normally
maintaining the electrodes.
6. A portable electric welding apparatus com
prising a pair of welding electrodes to engage
the material being welded, one of the electrodes
being fixed and the other electrode movable
toward and away from the said ñxed electrode,
having a cylindrical chamber formed in one end
means
normally supporting the fixed electrode
thereof, means for directing iluid pressure into 10 and enclosing
a iiuid pressure cylinder, a piston
the said cylindrical member and a piston recip
in said cylinder mechanically connected with the
rocally mounted in said chamber, a portion of
said movable electrode and adapted to apply
the said piston extending outwardly of the said
tubular body member, a sleeve-like member slid
ably mounted on the exterior of the said tubu
lar body member, a yoke on said sleeve-like
member spanning one end of the said tubular
body member, the said piston rod being con
nected to the said yoke, iluid sealing means lo
cated inwardly of the ends of the said tubular
body member and forming a seal between the
said piston rod and the said tubular body mem
ber, a circular frame mounted on the said body
member and insulated with respect thereto and
spaced with respect to the said sleeve-like mem
ber and means on the said sleeve-like member
and on the said circular frame for receiving
welding electrodes.
5. An electric resistance welding apparatus of
the type in which the apparatus serves as a
means for applying pressure to the parts to be
welded and including a tubular body member
having a cylindrical chamber formed in one end
thereof, means for directing iluid pressure into
the said cylindrical member and a piston recip
rocally mounted in said chamber, a portion of
the said piston extending outwardly of the said
tubular body member, a sleeve-like member slid
ably mounted on the exterior of the said tubu
lar body member, a yoke on said sleeve-like
member spanning one end of the said tubular
welding pressure to the material being welded,
the said support means for the fixed electrode
including a tubular extension and the said mov
able electrode including an annulus slidably en
gaging the said tubular extension of the iixed
support.
7. An electric resistance welding apparatus of
the type in which the apparatus serves as a
means for applying pressure to the parts to be
welded and including a cylindrical body member
having a chamber formed therein, means for in
troducing fluid pressure into said chamber, a
piston in said chamber having a rod connected
thereto and extending outwardly of the said body
member, a sleeve-like member of current conduct
ing material positioned on the exterior of the cy
lindrical body member for reciprocal movement
thereon and connected to the said piston rod for
movement thereby, a frame formed of current
conducting material positioned on the said cylin
drical body member and insulated therefrom,
means on the said sleeve-like member and on
the said frame in oppositely disposed aligned
relation for receiving welding electrodes, and a
key and keyway formed on the sleeve-like mem
ber and the cylindrical body member, respec
tively, for maintaining the electrode receiving
means in oppositely disposed relation.
body member, the said piston rod being con
LOUIS R. O’NEÍLL.
nected to the said yoke, fluid sealing means lo
cated inwardly of the ends of the said tubular
REFERENCES CITED
body member and forming a seal between the (i5
The
following
references are of record in the
said piston rod and the said tubular body mem
nie of this patent:
ber, a circular frame mounted on the said body
member and insulated with respect thereto and
UNITED STATES PATENTS
spaced with respect to the said sleeve-like mem
Number
Name
Date
ber and means on the said sleeve-like member 50 2,293,338
Harris __________ _- Aug. 18, 1942
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