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Dec. 24, 1946.
T. NELSON
2,413,189.
STUD WELDING MACHINE
~ Filed March 27, 1944
2 Sheets-Sheet l
INVENTOR
'xr
Ted Ne/son
BY 6M, .-4 @w
H15 ATTORNEY `
Dec. 24, 1946.
T. NELSON
2,413,189
STUD WELDING MACHINE
Filed Ma?ch 27, 1944-
2 sheets-sheet 2
INVENTOR
Tea’ IVe/.son
MMM@
HIS ATTORNEY
Patented Dec. 24, 1946
ahsisi
UNITED STATES PATENT OFFICE
2,413,189
STUD WELDENG MACHINE
Ted Nelson, San Leandro, Calif.
Application March 27, 1944, Serial No. 528,196
18 Claims.
l
(Cl. 219-4)
2
My invention relates to welding machines and
particularly to welding machines for welding
' and carrying the chuck in which the stud is held
studs to a base such as a Wall or ceiling or floor
movable in the longitudinal axis of the barrel
and responsive to electrically energized means,
is provided for drawing the plunger into the
barrel to move the stud away from the plate to
which it is to ‘ce fused, so that the welding arc
is established. Spring means is provided for
thrusting the plunger in the opposite direction to
seat the heated stud, when the energizing circuit
is broken. ri‘he electrically energized means in
cludes coils of a heavy electrical conductor, em
bedded in the wall of the housing barrel. This
plate.
The general object of the invention is the pro
vi-sion of a machine for making such welds with
automatic and perfect control of the several vari
ables which determine the soundness of the union,
the most important of which are amount of sepa
ration of electrode elements, length of period of
heating, the instant of physical union ci the elec
trode elements, and the control ci the arc. The
result of such control is an enormous speed-up in
the number of perfect welds which the operator
can make in s, given period.
’
during the welding operation. An armature also
is an important feature of my invention for a
15 variety of reasons which will become apparent
Another object of the invention is the provi
when the entire construction is understood. The
sion of a Welding machine oi such light weight
armature carries a pick-up device or clutch incoh
and compact arrangement that it may be dis
anisin, operating to seize the plunger in whatever
posed. in a cylindrical housing having a pistol
position it lies when the stud is ñrst seated on the
grip in which the manual control is placed, so that 20 plate; and then move it a predetermined distance
the whole instrument somewhat resembles an
automatic pistol, with characteristic ease and
facility in handling.
My invention possesses other objects and fea
tures of value, some of which with the foregoing
will be set forth in the following description oi
the invention. It is to loe understood that I do
not limit myself to the showing made by the said
description and the drawings as i may adopt
variant forms of the invention within the scope
of the appended claims.
In the drawings:
Figure i is a partial sectional view taken in a
plane lying in the main central axis. A short
section of a plate to which the stud is to .he weide
is included; and the gun is shown in position
against it. A portion of the cover plate on the
grip is shown.
Figure 2 is a `side elevation of the instrument,
taken in a direction opposite to that oi Figure l.
Figure 3 is a wiring diagram showing the elec
trical circuits and controls.
In terms ci broad inclusion the welding ma
chine or gun ci my invention comprises a gener»
ally cylindrical barrel and grip of a dielectric or
electrically nonmconducting material, which to
so that the arc gap is always the same despite
variation-s in stud and welding surface.
4Coils are provided for creating a magnetic field
around the welding arc so as to stabilize it; and
stud, stabilizer coils and energizing coils are pref
erably in series connection with the conductor
supplying the Welding current which preferably
enters the housing through the butt of the handle.
Appropriate devices outside the housing provide
the welding current and make and break the
welding circuit, under the control of a timer
mechanism7 which is put into operation by a
manually operated switch or trigger arranged in
the housing grip, so that by the pressure of a
iinger, the operation of the welding cycle may be
initiated.
Means are also provided for giving a
visual signal to the operator, when during the
positioning of a stud, physical electrical contact
is made between the electrodes, and the welding
cycle may he started. This signal is preferably
located on the side oi the housing barrel, Within
the held of vision of the operator.
In greater detail, my stud Welding machine or
gun comprises a generally cylindrical hollow bar
rel 2, adjacent one end of which is an integrally
:formed hollow hand grip 3, closed on one side
'oy a screw~held cover plate ll. These portions
gether furnish the housing in which the operat
ing parts and manual control are disposed. The
comprise the housing in which the parts of the
weight
shape are not greatly different from
gun are arranged, and are formed of a thermo
those or" a large automatic pistol, but have the hi) setting type of plastic, preferably a phenol-form
advantages in manipulation and control which
broadly characterize the pistol shape. The op
erating mechanism within the barrel portion of
the housing comprises a plunger mounted for
movement in the longitudinal axis of the barrel,
aldehyde resin which is strong and light, easily
made, and of high dielectric quality. The last is
important from the viewpoint of safety of the
operator, and because certain of the electrical
conductors may he ñxed in place and insulated
2,413,189
3
4
_and stud are electrically connected in series.
Connection through the stabilizer coils is secured
by terminating the conductor 3i in an eye 33,
held tightly between a fiber washer 3è and the
cost.
Extending laterally from the barrel at the end Ul ñrst coil 32 by the engagement of the chuck
against a steel washer 36, brazed to the last coil
opposite the grip, are lugs 5 in which threaded
32. The coils 32, except the two end surfaces
metal bushings or thimbles t are incorporated
left for contact, are embedded in and insulated
when the gun housing is molded. Preferably
by a thermo-setting resin 3l; and of course the
three of these lugs are equispaced about the bar
conductor 3i is also heavily insulated. Because
rel, and the thimbles serve as mountings for the
the end of the conductor must move back and
legs 'l which are made adjustable in length by
forth with the plunger assembly, the conductor is
the threaded extensions 8.
given one complete loop 38 to give flexibility to
Slidably'mounted in the barrel 2 ci the housing
by embedding them in the housing wall, thus
achieving maximum values of space, lightness of
Weight, security, insulation and economy at low
is the plunger assembly, including the plunger 9,
at the outer end of which is iixed the flanged
the whole.
collar lll, which in turn, at its outer end, is
threaded to mount the chuck Il, split at its hol
arc at the
low outer end to form resilient jaws l2 to hold
spattering
the stud I3. Thus the plunger, collar, chuck and
Slidably
stud are fixed rigidly together; and in the op 20
half of the
eration of the tool, reciprocate as one.
The outer surface of the chuck is formed with
shallow threads or grooves to form a readily ad
justable mounting for the spring la, in the oppo
site end of which is carried the porcelain ferrule
l5, which surrounds the end of the stud during
its welding to the plate i6. The spring seats the
ferrule resiliently against this plate.
The plunger 9 is held centrally in the barrel by
the cylindrical ilange Il, forming a sliding fit in .
`
The welding current through the stabilizer coils
32 generates a powerful magnetic ñeld about the
welding aro, tending to confine and stabilize the
location of the weld, and preventing l
and waste of the molten metal.
mounted in approximately the inner
thickened housing wall containing the
solenoid coils, is a core or armature lli, the move
ment of which into the coils (to the left of Fig
ure l) is determined by the ñxed core @2. This
has a threaded engagement in the housing wall
and in the yoke shaped steel reinforcing tie d3,
which ties the wall in which the solenoid coilsv
are embedded into a mechanically strong block
able to resist the stresses placed thereon in the
operation of the gun. Movement of the armature
under the influence of the energized solenoid
the bore of the barrel, and prevented from rotacoils determines the distance the stud is moved
tion therein by a key fitting the keyway I8. The
to draw the welding arc; and since this distance
inner end of the plunger forms a sliding ñt with
is a predetermined value, the position of the lixed
the stop ring le, fixed inV the barrel against a
shoulder by oppositely disposed set screws 2Q, one 35 core may be varied by the use of shims ¿ill under
the head of the ñxed core. It will be observed that
of which is indicated in Figure 1.
the ñxed core becomes a powerful magnet when
A iiange 2l on the ring is provided, against
the coils are energized, so that when the arma
Which the shoulder 22 of the plunger seats to limit
ture is stopped by it, the armature is strongly
the outward movement of the plunger assembly;
and this outward position is normally maintained 40 held in the retracted position, until the current
is interrupted.
, by the heavy spring 23, which also serves to effect
Clutch means are provided for connecting the
the recovery movement to this position of the
armature to the plunger assembly for movement
plunger assembly after it has been retracted.
together as one, when the armature moves under
The spring 23 constitutes secondary means for
the iniiuence of the magnetic ñeld created by the
moving the plunger in one direction or outwardly.
coils, and for maintaining this connection so long
Primary means are provided for moving the
as there is any stress tending to separate the two.
plunger and its connected parts in the opposite
This clutch connection however is released and
direction or inwardly. The inward movement
the parts are Tree of each other when the arma
separates the electrodes, that is, pulls the stud
ture moves in the other direction; that is, toward
away from the plate or base to establish the
the plunger assembly, or the plunger assembly
welding arc; and the outward movement plunges
is -moved inwardly of the housing and toward the
the heated stud down into -the heated plate to
armature. The latter happens when a stud is set
fuse them together. When the stud is loaded into
in position to be welded. As already mentioned
the chuck, the adjustment of the parts is such as
to allow the stud to project a small amount be- ' the adjustment oí the three legs is preferably
such as to allow the stud to extend somewhat be
yond the plane of the leg ends so that when plac
yond them, so that the plunger assembly is pushed
ing the gun in the position of parts shown in Fig
slightly back into the barrel against the resist
ure 1, the stud is pressed back from its free posi
ance of the spring 23, when the stud is in posi
tion, shown in the dotted lines, and is held
tion and the three legs seated to insure per
resiliently against the plate. In a similar fashion
pendicularity of the stud. During this movement
~ the spring lll is adjusted so that when the stud is
of the plunger assembly, which varies with varia
seated in the position or” the weld, the ferrule is
tions in the stud and in the surface to which the
also held resiliently against the plate.
stud is to be welded, the assembly is free of the
Embedded in the inwardly thickened wall of
armature, but with the power movement of the
the housing at the grip end are the coils 26 of a
armature, the clutch acts instantly to engage the
solenoid. One end of the coil terminates in a
plunger, so that the entire plunger assembly in
connector socket within the grip chamber 2l,
cluding the stud is retracted against the resist
and to which. the end of the welding current con
ance of the spring 23, the exact amount of the
ductor 2S is ñxed by the screw 2S. The other end
terminates in a connector socket on the outside 70 armature movement. This is always the same for
a given setting of the lixed core. Thus irrespec
of the barrel, and to which the end of the con
ductor 3l is fixed.
.
tive of variations in stud or the plate to which it
The other end of the conductor 3l is connected
is tobe welded, the stud is always retracted the'Y
through- the stabilizer coils 32 to the chuck, so
same'predetermined distance determined >by the
that solenoid coils 25, stabilizer coils 32, chuck 75
fixed core setting. This distance is of course the '
5
2,413,189
one best suited for the arc required for the stud
used.
The clutch means required for this duty com
prises a link e6, disposed longitudinally of the
barrel and against the upper wall thereof, and
having a flange @l rigidly fixed by the screw 68
to the end of the armature. A tongue da, pressed
out of the link forms a key which, engaging in
the keyway 5l formed in the barrel, prevents
transverse movement of the link while permitting
its rectilinear movement back and forth with the
armature.
The free end of the link is provided with a short
hook flange 52, which engages the ñxed stop ring
i9 to limit the recovery movement of the arma
ture after its power stroke. A spring 53 inter
posed between the nxed core and the armature
in aligned axial recesses tends to return the ar
mature and link to the recovered position as
shown in Figure l. The air pocket formed be
tween the core and armature may be ignored,
since the volume changes but little due to the
central recesses, and passage of air occurs past
the armature. The hook flange 52 has another
important function.
It is hooked over one side
of the clutch ring all surrounding the inner end
of the plunger. rfhe clutch ring is so sized and
proportioned that when it is perpendicular to the
plunger there is no engagement; and plunger and
clutch ring may be freely moved relative one to
the other. A diameter of plunger about .093 of
an inch less than the diameter or the hole in the
clutch ring gives a satisfactory result. To pre
vent fleë-íure in the ring, it is preferably provided
with a short peripheral flange 55.
Tipping the clutch ring out of perpendicularity
with the plunger causes an instant seizure of the
plunger by the ring. A boss 53 in the stop ring,
on the opposite side from the hook 52, supports
the clutch ring in the inactive or non-seizingpo
sition, into which it is resiliently pressed by the
coil spring 5l, the end coils of which are disposed
about the heads of the plunger and screw 48. rllhe
inner end of the plunger head is recessed as
shown, both for lightness and to receive the pro
jecting head of the screw 48 upon the extreme
movement of the plunger.
From the foregoing it will be clear that both
retracting and extending movement of the
plunger assembly may occur without disturbing
the perpendicularity of the clutch ring to the
cylindrical plunger head which it encircles, but
that the least power move of the armature and
link tips the clutch ring to seize the plunger,
which then moves with the armature and against
the spring 23, to the end of the armature move
ment where it is held until the circuit is broken,
whereupon spring 23 effects the rapid recovery
movement of the plunger assembly, spring 53 ef
6
the solenoid however the stud is lifted or retract
ed from the plate to establish the welding arc
and thereafter until the circuitis broken the
current jumps the gap between stud and plate
heating both to the degree required for fusing.
Upon the breaking of the circuit through the
solenoid coils, the plunger assembly
released;
and the spring
effects its r cover-y movement,
plunging Lhe stud into the heat softened area
on the plate, The fused material cools almost
instantly, at which time the gun is pulled free,
leaving the stud welded in place.
Manually operated means in the grip portion
of the gun housing are provided for initiating
the Welding cycle of operations. After the in
itial setting of the spark gap interval (deter
mination of ïniature travel by setting the ñXed
core) which need be changed only when change
of size of stud requires a diiîerent spark gap,
loading the chuck with a stud, placing the stud
on the mars: where it is to be welded, and press
ing the trigger is all that is required for a per
feet weld.
Disposed in the grip of the housing in a po
sition conveniently under e. finger is a trigger,
preferably a push button ill, bearing at its inner
end against the spring switch arm t2, which is
spaced a short distance from the 'spring switch
arm §53.
These arms are insulated from each
other; and form the terminals of the conductors
Sil and lit respectively, carried in a flexible con
duit 6l of convenient length to the stationary
electrical devices which effect and control the
operation of my gun. The conduit lil enters the
butt end of the grip along with the conduit 68
the welding current conductor. This
t together with the placing of the
solenoid coils well back in the “breach” of the
barrel, and
placing and proportions or" the
other parts, contributes heavily to the balance
of the gun in the hand of the Welder.
While my gun
relatively light in Iweight
when compared to previously known welding
tools, it is of very great importance tc the oper
ator after a few hours or use, whether the in
strument balances easily in the hand, or whether
a muscular effort is required to position the gun
in addition to the necessary overall support. My
gun has been designed to insure balance about
the grip; and this is directly reflected in the
number of studs which can be welded by an op
erator after the first few hours of the day.
The remote controls and connecting circuits of
my tool are shown in diagram in Figure 3. ri‘he
control devices are standardized and well known
and only the circuits which I prefer to use re
quire detailed eXplälR-ÈÍOIL
The welding current is derived from a direct
current generator it, having a conductor ‘il for
fects the recovery of the armature and link, and (il) grounding its positive side on the plate or wall
spring 5l presses the clutch ring back into its in
“it to which the studs are to be welded, The
active or free perpendicular position against the
negative side of the generaoäoin is connected by
hook 52 and boss 55.
conductor lil to one pole of the switch al, the
Thus irrespective
the position of the plunger
other pole being connected by conductor
run
when the gun has been placed to make a weld
ning through conduit
to the gun.
and with the stud pressing against the plate,
The welding current control 1switch
which
operation of the solenoid and clutch results in
normally open is operated by the relay 82,
seizing the plunger assembly and retracting it
supplied by the conductors
and
connect
the fixed predetermined distance traveled by the
ed through the normally
twin switches 8S
armature, the energizing current passing in series
El with the coi luctors
and 535i respec
through the solenoid coils
conductor 3i, sta
tively, connected in turn to a source of A. C.
bilizer coils 32, chuck, and stud. Since the stud is
current. The twin switches,.- Sfâ and 3l are oper
in physical contact with the plate when the cir~
ated by the relay Sil in the circuit including the
cuit is ñrst established, the flow is at first di
conductors Q2 and S3 connected by the normally
rectly from plate to stud. With the action of
closed switch Sil, which is controlled by the timer
2,413,189
7
8
closed by the relay |05, supplied by conductors
means on the plunger for holding a stud, a sole
the armature and plunger for seizing the plunger
9S. The conductor 93 is fed from the conductor
when the armature is actuated, and a spring car
64 extending to the terminal 62 of the trigger
ried by the armature and plunger for releasing
switch, as also is the conductor 97 which sup
the clutch means when the plunger is moved by
plies the timer. The other terminal 63 0f the
the first-named spring.
trigger switch is supplied by the conductor 65,
3. A stud welding machine comprising a cy
connected to the conductor 88.
lindrical housing, a plunger slidably arranged in
Means are provided for indicating to the op
the housing and substantially coaxial with the
erator while positioning the stud the establish
long axis thereof, means on the plunger for hold
ing of electrical contact between stud and plate;
ing a stud substantially coaxial with the plunger,
and this is preferably done by a red neon light
primary means for moving the plunger in one di
98 disposed on the side of the gun and which
rection, secondary means for moving the plunger
glows when the circuit is completed. The lamp
in the other direction, and mechanism including
is supplied by conductors |û| and |62, the lamp
a spring pressed clutch ring, interposed between
ends of which are carried into the gun through
the conduit 6l. The other end of conductor llii 15 the plunger and the primary means for seizing
the plunger when the primary means is actuated
is connected to conductor 8S; and the other end
and for releasing the plunger when the plunger
of conductor |82 terminates in one pole of the
is moved by the secondary means.
.
switch ID3, the other pole of which is connected
Ll. A stud welding machine comprising a hous
to conductor 38 by conductor lilli.
The switch §03 which is normally open, is 20 ing, a plunger slidably arranged in the housing,
noid core slidable in the housing, an energizing
|91 and |98 in parallel with a resistance |û9,
coil surrounding the core, clutch means between
shunted around the switch 8|. Both relay wind
the core and plunger for seizing the plunger when
ings and resistance are calculated to pass only a
fraction of the available direct current, as only 25 the core is moved in one direction by the ener
gized coil, a spring for moving the plunger in the
the operation of the relay |06 to close the switch
other direction, and means on the solenoid core
|63 in the neon lamp circuit, is desired when the
for releasing the clutch means when the plunger
stud closes the circuit through the ground, thus
moved by the spring.
indicating that the closing of the trigger switch
5. A stud welding machine comprising a hous
will start the flow of the full volume of welding 30
ing, a plunger slidably arranged in the housing,
current.
means on the plunger for holding a. stud, a sole
The instant the trigger switch is closed, the re
noid core slidable in the housing, an energizing
lay 9! closes the twin switches 85 and 8l to supply
coil surrounding the core, a ring slidable on the
the relay 82, which then closes the switch 8l , per
mitting the full direct current to flow through the 35 plunger when normal to the plunger axis and en
gaging the plunger when tipped from the normal
welding circuit. This, it will be recalled, ener
position, means pressing the ring into normal po
gizes the solenoid coilsl 2S, and pulls the stud
sition, means connecting the core to one side of
away from the plate to» establish the welding arc.
the ring whereby movement of the core by the
Simultaneously with the energizing of the relay
9|, the timer 9S starts its predetermined timed 40 energized coil tips the ring and moves the plunger
in one direction, and a spring for moving the
cycle, at the end oi which it opens the switch 94,
plunger in the other direction.
thus allowing the twin switches 86 and- 8l to open,
6. A stud welding machine comprising a hous
which in turn cause the opening of the switch 8|
ing, a plunger slidably arranged in the housing,
in the welding circuit, ending the arc and releas
ing the plunger assembly from the pull of the 45 means on the plunger for holding a stud, a
plunger-moving spring interposed between
solenoid so that the stud is seated against the
plunger and housing, a clutch ring on the plunger
plate by action of the spring 23.
and engaging the plunger when tipped from nor
With the generator running and the location
mal position, means normally retaining the clutch
in which the studs are to be welded easily ac
cessible, a welder can easily load with stud and 50 ring in disengaged position, a link engaging one
side of the clutch ring to tip it from normal
ferrule, position the stud, press and release the
position when the link is moved, and electrically
trigger, pause, and then pull the gun chuck free
actuated means for moving the link to move the
of the perfectly welded stud in ten seconds or
plunger to compress the spring.
less, and can maintain a rate of 250 to 300 welded
7. A stud welding machine comprising an elec
studs an hour. Positions reached with diñîculty, 55
trically non-conducting housing, a plunger slid
or bent or other special studs will of course slow
ably arranged in the housing, means on the
up production.
plunger for holding a stud, a, plunger-moving
I claim:
spring interposed between plunger and housing,
l. AA stud welding machine comprising a hous
ing, a plunger slidably arranged in the housing, 60 a clutch ring on the plunger, means normally re
taining the clutch ring in disengaged position, an
means on the plunger for holding a stud, primary
armature, a link connecting the armature to one
means for moving the plunger in one direction,
side of the clutch ring, and an electric conductor
secondary means for moving the plunger in the
disposed to energize the armature and embedded
other direction, means interposed between the
plunger and primary means for seizing the plunger 65 in the wall of the housing.
8. A stud welding machine comprising an elec
when the primary means is actuated, and means
trically non-conducting housing, a plunger slid
located between the plunger and primary means
for releasing the plunger when the plunger is
ably arranged in the housing, means on the
moved by the secondary means.
plunger for holding a stud, a plunger-moving
2. A stud welding machine comprising a hous 70 spring interposed between plunger and housing,
ing, a plunger slidably arranged in the housing,
an armature slidably arrangedv in the housing, a
core adjustable to limit movement of the arma
means on the plunger for holding a stud, an elec
tricallyoperated armature for moving the plunger
ture, coils of an electric conductor embedded in
in one direction, a spring for moving the plunger
the housing around the armature and core, and a
in the' opposite direction, clutch means between 75 clutch for connecting the armature and plunger.
9
2,413,189
10
9. A stud Welding machine comprising a gen
erally cylindrical housing of electrically non-con
ducting material, a plunger slidably arranged in
the housing, means on the plunger for holding a
stud, a spring interposed between plunger and
housing for moving the plunger in one direc
tion, an armature slidably arranged in the hous
. ing, an electric conductor embedded in the Wall
from the plate to establish the welding arc and
including coils of an electric conductor embedded
in the wall of the housing.
15. In a machine for welding a stud to a plate,
a housing, stud holding means carried by the
housing, electro-magnetic means for moving the
stud holding means to establish the welding arc
between stud and plate, and arc stabilizing means
of the housing to energize the armature to move
including a plurality of coils of an electric con
in the opposite direction, and means for con 10 ductor arranged on the machine adjacent the
necting the armature and plunger.
stud and connected in series with the electro
l0. A stud welding machine comprising a gen
magnetic means, and means for energizing the
erally cylindrical housing of electrically non-con
electro~magnetic means and coils.
ducting material, a plunger slidably arranged in
16. A stud welding machine comprising a hol
the housing, means on the plunger for holding a
stud, a spring interposed between plunger and
housing for moving the plunger in one direction,
an armature slidably arranged in the housing,
an electric conductor embedded in the wall of
the housing to energize the armature to move
in the opposite direction, means for connecting
the armature and plunger, and an electric con
ductor about the stud-holding means and in
series with the conductor embedded in the hous
ing wall.
11. A stud welding machine comprising a hous
ing of dielectric material, coils of an electric con
ductor embedded in the housing wall at one end,
a plunger slidably arranged at the other end,
means on the plunger for holding a stud, an
armature energized by the coils and slidably ar
ranged in the housing, means operating to connect
the plunger and armature when the latter moves
in one direction, and a spring compressed by such
movement for moving the plunger in the opposite
direction.
l2. A stud welding machine comprising a hous
ing of dielectric material, coils of an electric con
ductor embedded in the housing wall at one end,
a plunger slidably arranged at the other end,
means on the plunger for holding a stud, an
armature energized by the coils and slidably ar
ranged in the housing, means for connecting the
plunger and armature when the latter moves in
one direction, a spring compressed by such move
ment for moving the plunger in the opposite di
rection, and a plurality of coils of an electric con
ductor about the stud holding means and in series
low generally cylindrical housing of dielectric
material, a metal coil embedded in the wall of
the housing adjacent one end thereof and form
ing both an electric conductor constituting the
coil of a solenoid and a mechanical reenforcement
for the wall, the wall constituting insulating and
mounting means for the coil, a solenoid core slid
able within the coil, an adjustable stop for limit
ing the travel of the solenoid core, a plunger slid
ably arranged in the housing at the end opposite
the solenoid coil, means on the plunger for hold
ing a stud, and means disposed between the sole
noid core and plunger for connecting the two for
coextensive movement as one when the solenoid
is energized to move the core and for releasing
30 the plunger from the solenoid core when the
solenoid is deenergized.
17. A stud welding machine comprising a hol
low generally cylindrical housing of dielectric
l material, a metal coil embedded in the wall of
the housing adjacent one end thereof and form
ing both an electric conductor constituting the
coil of a solenoid and a mechanical reenforcement
for the wall, the wall constituting insulating and
mounting means for the coil, a solenoid core slid
40 able within the coil, a plunger slidably arranged
in the housing at the end opposite the solenoid
coil, means on the plunger for holding a stud,
means for connecting the solenoid core and
plunger when the core moves in one direction, and
a spring compressed by such movement for mov
ing the plunger in the opposite direction.
18. A stud welding machine comprising a hol
low generally cylindrical housing of dielectric ma
with the conductor embedded in the housing wall.
terial, a metal coil embedded in the wall of the
13. A stud welding machine comprising a hous 50 housing
adjacent one end thereof and forming
ing, a plunger slidably arranged in the housing,
both
an
electric conductor constituting the coil
means on the plunger for holding a stud, a spring
of a solenoid and a mechanical reenforcement for
interposed between the plunger and housing for
the wall, the wall constituting insulating and
moving the plunger in one direction, electro
mounting
means for the coil, a solenoid core Slid
magnetic means including coils of an electric 55
able within the coil, a plunger slidably arranged
conductor arranged in the housing to move the
in the housing at the end opposite the solenoid
plunger in the opposite direction, a plurality of
coil, means on the plunger for holding a stud,
coils of an electric conductor about the stud
said
solenoid coil and core and said plunger and
holding means and in series with the coils of the
stud holding means being in axial alignment and
electro-magnetic means, and means for supply
60 coaxial with said cylindrical housing, and means
ing an electric current to the coils,
for connecting the solenoid core and plunger
14. In a machine for welding a stud to a
plate, a housing of dielectric material, and elec
tro~magnetic means for moving the stud away
when the core moves in one direction.
TED NELSON.
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