U.S. patent number 3,847,287 [Application Number 05/366,183] was granted by the patent office on 1974-11-12 for single-pole electrical plug connection for shielded arc welding apparatus.
Invention is credited to Wilhelm Dinse.
United States Patent |
3,847,287 |
Dinse |
November 12, 1974 |
SINGLE-POLE ELECTRICAL PLUG CONNECTION FOR SHIELDED ARC WELDING
APPARATUS
Abstract
A single-pole electrical plug connection for shielded arc
welding apparatus including plug and socket bodies telescopically
interfitting and relatively rotatable to produce interlocking, the
socket bodies having interconnectible and coaxial tubes carrying
the electrode wire, and additional connectors for other utilities
such as gas and electrical control signals; and a centrally bored
adapter pin mountable on the wire feed mechanism and carrying one
of said bodies in stationary position and supplying the electrode
wire therethrough; additional utility supply tubes for coolant and
the like having connectors mounted on said plug and socket bodies
in an arrangement whereby one of the bodies has a rotatable sleeve
carrying such coolant tube connectors.
Inventors: |
Dinse; Wilhelm (2000 Hamburg
70, DT) |
Family
ID: |
27436196 |
Appl.
No.: |
05/366,183 |
Filed: |
June 1, 1973 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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277086 |
Aug 1, 1972 |
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277087 |
Aug 1, 1972 |
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Foreign Application Priority Data
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Jun 3, 1972 [DT] |
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7220830 |
Jun 3, 1972 [DT] |
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7220918 |
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Current U.S.
Class: |
219/137.63;
219/136; 219/137.62 |
Current CPC
Class: |
B23K
9/133 (20130101); B23K 9/323 (20130101) |
Current International
Class: |
B23K
9/133 (20060101); B23K 9/32 (20060101); B23k
009/00 () |
Field of
Search: |
;219/130,136,138,74,75
;174/15C ;337/177,272 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Truhe; J. V.
Assistant Examiner: Peterson; G. R.
Attorney, Agent or Firm: Palmatier; H. Dale Haller; James
R.
Parent Case Text
RELATED APPLICATIONS
This application is a continuation-in-part of U.S. applications
Ser. No. 277,086 and 277,087, both filed on Aug. 1, 1972, now both
abandoned.
Claims
What is claimed is:
1. A single-pole electrical plug connection for mounting in the
base of a mounting plate and through which a fusible endless
electrode wire from a feed mechanism, and auxiliary utilities, are
supplied for shielded arc welding apparatus, the connection
comprising coaxially disposed plug and socket bodies assembled and
interlocked by a relative endwise displacement and rotational
movement, the plug and socket bodies having interfitting means
permitting relative rotation between the plug body and the socket
body and about a longitudinally extending axis and said
interfitting means drawing said bodies tightly together by reason
of such rotation, said plug and socket connection having a pair of
guide tubes for the fusible endless electrode wire and arranged
centrally in said bodies with connector means for releasably
joining the tubes together, an endwise displaceable and rotatable
insulated insert in the socket body and having the guide tube of
the socket body affixed therein, a spring urging the insulated
insert and guide tube toward the plug body to maintain said
connector means together, additional connector means in the plug
body and in the insulated insert through which auxiliary utilities
are supplied, the socket body having an adapter pin secured
therein, said pin having a longitudinal wire-carrying bore
therethrough in alignment with said guide tubes and also having
means for attachment to such a mounting plate and electrode wire
feed mechanism.
2. A single-pole electrical plug connection according to claim 1
wherein said adapter pin is externally threaded for attachment to
the mounting plate.
3. A single-pole electrical plug connection according to claim 1
wherein one of said connector means is disposed eccentrically of
the rotatable insert to produce rotation thereof.
4. A single-pole electrical plug connection according to claim 1
wherein the adapter pin has a central enlarged bore confronting the
insulating insert, and said rotatable insert having an integral
sleeve extending into said bore and axially and slidably guided and
rotatable in the bore of said adapter pin.
5. A single-pole electrical plug connection according to claim 4,
characterized in that a sealed space is defined within the socket
body and between the insert and the adapter pin, duct means
conveying shielding gas to and from said sealed space, said sealed
space serving as a conduit for the shielding gas.
6. A single-pole electrical plug connection according to claim 4,
and electrical conductor means permissive of rotation of the insert
relative to said socket body and extending to and through said
insert for continuity through the plug connection.
7. The single-pole electrical plug connection of claim 1 including
additional utility plug-in connectors disposed externally of the
plug and socket bodies, one of the additional plug-in connectors
being affixed on the plug body to be rotated therewith in assembly
and interlocked with the socket body, a rotatable sleeve mounted on
the socket body and having the mating additional plug-in connector
mounted thereon, the plug-in connectors being assembled and rotated
with the sleeve and relative to the socket body as the plug and
socket bodies are rotated for interlocking.
8. A single-pole electrical plug connection through which a fusible
endless electrode wire and auxiliary utilities including coolant
are supplied for shielded arc welding apparatus, the plug
connection comprising coaxially disposed plug and socket bodies
assembled and interlocked by relative endwise displacement and
rotational movement, the plug and socket bodies having interfitting
means permitting relative rotation therebetween and about a
longitudinally extending axis and said interfitting means drawing
said bodies tightly together by reason of such rotation, said plug
connection having a pair of guide tubes for the fusible endless
electrode wire disposed centrally in said bodies and having endwise
interfitting connector means releasably joining the tubes together,
an insulated rotatable insert in the elongate socket body and
movable both longitudinally and rotatably relative to the
longitudinal axis, and spring means restraining endwise movement of
the rotatable insert in the socket body away from the plug body,
and urging the rotatable insert toward the socket body, additional
utility plug-in connectors disposed externally of said plug and
socket bodies and being affixed on the plug body to be rotated
therewith in assembly and interlocked with the socket body, a
rotatable sleeve mounted on the socket body and having mating ends
of said additional plug-in connectors mounted thereon, the
additional plug-in connectors being assembled and rotated with the
sleeve and relative to the socket body as the plug and socket
bodies are rotated for interlocking, and said plug-in connectors on
the plug body and rotatable sleeve being secured together by the
interlocked plug and socket body.
9. The single-pole plug connection according to claim 8 wherein
said additional utility plug-in connectors include conduit fittings
providing open flow connection therethrough for supplying coolant
through the single-pole plug connection, said conduit fittings
producing rotation of the rotatable sleeve in response to rotation
of the plug body during assembly and interlock of the plug and
socket bodies.
10. The single-pole electrical plug connection according to claim 7
wherein said socket body includes a spring bearing against the
socket body and against said insulated insert and urging the insert
toward the plug body to maintain endwise pressure on the
interfitting connecting means of said guide tubes, detent means
normally retaining the insulated insert in predetermined rotational
orientation in the socket body and releasing the insulated insert
for rotation with the plug body after the insulated insert has been
longitudinally displaced by the plug body during assembly of the
plug connection, and said plug body and insulated insert having an
additional pair of plug-in utility connectors disposed
eccentrically of the plug body and rotatable insert and joined
together to produce rotation of the insert with the plug body upon
assembly and disassembly of the single-pole plug connection.
11. The single-pole electrical plug connection according to claim
10 wherein said socket body has an endwise open and interior
threaded rear portion, an adapter pin threaded into said rear
portion of the socket body and protruding from the socket body,
said adapter pin having a central bore receiving one of the guide
tubes therethrough, the central bore in the adapter pin being
enlarged adjacent the insulated insert, and a rigid sleeve formed
integrally of the insulated insert and being longitudinally
slidably assembled and rotatable within the enlarged central bore
of the adapter pin for movement with the insulated insert
longitudinally and rotationally during assembly and disassembly of
the plug connection, and sealing means sealing the open space
endwise between the insulated insert and the adapter pin and
encompassed by the rear portion of the socket body, and fluid flow
passages in the insulated insert and plug body supplying flow
connection to the sealed space adjacent the adapter pin and through
the insulated insert and plug body, whereby multiple utility
connections are assembled and disassembled upon longitudinal and
rotational displacement of the plug body in the socket body for
supplying the utilities needed for the shielded arc welding
apparatus.
Description
BRIEF SUMMARY OF THE INVENTION
This invention relates to a single-pole electrical plug connection
for shielded arc welding apparatus and comprises coaxially disposed
plug and socket bodies adapted to be interlocked by a relative
rotational movement.
Heretofore, a great variety of electrical plug connections are
known in which a retainer pin is provided and adapted to engage in
a groove, when fitting plug and socket bodies into one another, and
to establish an electrical contact upon rotation. In one prior art
plug connection of this type the retainer plug is provided at the
periphery of the plug body. When fitting plug and socket bodies
into one another this retainer pin slides along a longitudinal
groove in the socket body. This longitudinal groove opens into a
helical groove, and retainer pin and helical groove are mutually
disposed in a manner so that when rotating the two bodies
relatively to each other the plug body will be urged into the
socket body and a bias pressure assuring good electrical connection
is achieved (German Utility Model 1,971,103).
It is an object of the present invention to provide a plug
connection of the above mentioned type which connection allows, in
addition to the main current connection, the connection of the
electrode guide tube and of further control and supply lines and
comprising plug or socket bodies adapted to be mounted with a
minimum of effort on already existing electrode wires feed
mechanisms.
This object is achieved in accordance with the present invention in
that a pair of connectors serving to connect the guide tube for the
fusible endless electrode wire is arranged centrally in a manner
known per se, in addition to further supply connectors in the plug
and socket bodies, and that the plug or socket body is connected to
an adaptor pin having a longitudinal bore in alignment with the
guide tube.
By virtue of the specific design and arrangement of the adapter pin
the plug body or the socket body may be incorporated directly into
the electrode wire feed mechanism, instead of the conventional wire
feed guide. Advantageously, the mounting may consist of a thread on
the exposed adapter pin end. This permits the mounting on any
electrode wire feed mechanism of the various and different
manufacturers.
The further supply connections which may be connections for a
control current for activating and deactivating the welding
current, connections for the shielding gas or for a coolant may be
arranged either on the outside of or within the plug or socket
bodies.
By the expedient of mounting the adapter pin on the socket body a
simple design has been achieved. The adapter pin may not only serve
as a supporting element for the socket but concurrently as a
connecting element for a cable lug terminal or the like for the
welding current supply.
By the expedient of arranging the further supply connectors,
particularly the connectors for the coolant, externally of the
interconnection range of the further supply connectors including
particularly those for the shielding gas it is assured that
particularly when releasing the connection any possible coolant
leakage can never enter the shielding gas feed region which is
sensitive to such leakage. Due to the rotatable mounting of the
sleeve plug and socket bodies conducting the main or welding
current may be joined by means of a rotational movement so that a
good conduction of the relatively high welding current is assured.
The present invention therefore allows to fit further supply
connectors on the known single-pole electrical plug connection
without abandoning the interlocking connection by a relative
rotational movement.
When the socket body is provided with a rotatable insert and a
rotatable sleeve and interconnection with a simple plug body may be
effected such as when for example only the welding current and no
other supplies are to be taken off from the available
apparatus.
In the following, further advantages and the various features will
be explained in more detail with reference to an exemplary
embodiment shown in the appended drawing wherein:
FIG. 1 is a lateral cross-sectional view of a socket body with an
adapter pin, prior to effecting the plug connection with a plug
body;
FIG. 2 is a cross-sectional view of a plug body and the forwardly
facing part of a socket body, prior to being plug-connected;
FIG. 3 is a fragmentary cross-sectional view corresponding to FIG.
2, after the plug connection has been joined;
FIG. 4 is a front end view of the front face of the plug body;
FIG. 5 is a fragmentary lateral cross-sectional view of another
embodiment of plug and socket bodies, prior to interconnecting
these two bodies;
FIG. 6 is a cross-sectional view of the socket body shown in FIG. 5
to illustrate the rotatable insert mounted in this embodiment
within the socket body;
FIG. 7 is a detail end elevational view of the rotatable sleeve
seen from line 7--7 of FIG. 5; and
FIG. 8 is an end elevational view seen from line 8--8 of FIG.
5.
The plug connector shown in the drawing consists of a plug and a
socket designed to interconnect, in addition to the contacts for a
relatively high welding current, several other supply lines. A hose
assembly 1 connects the various supply lines to the plug. The
actual plug body 21 is arranged in a housing 2 projecting at 20 in
order to protect the exposed portion of the plug body. The housing
is made of rubber or any similar material.
The socket body 8 shown in a position opposite the plug body is
likewise protected by a rubber sleeve 3. An insulating sleeve 4 is
applied over the socket body.
The lead carrying the welding current in the plug is arranged as a
tubular conductor 17 which is clamped between a conical screw 18
and a mating conical check nut 19. The check nut 19 is in turn
threadedly engaged into the plug body 21.
A longitudinally displaceable and rotatable body or insert 12 is
confined within the conductive socket body 8 and has a peripheral
flange 29 projecting slightly radially to abut against a shoulder
of the socket body 8. The insert 12 is normally restrained against
rotation by a pin 30 affixed in the socket body 8 and projecting
into an endwise open groove 31 extending through the flange 29;
however, when the insert 12 is longitudinally displaced so that the
flange 29 clears the pin 30, the insert 12 may be rotated. The
longitudinal displacement of the insulated insert 12 is restrained
by a coil spring 33 which surrounds the insert and bears against
the flange 29 and against a rigid ring 49 also surrounding the
insulating insert 12 and retained by the threaded nut 48 which is
threadedly secured in the socket body 8.
A guide tube 13 for the welding rod extends essentially through the
plug connection and through both the plug body 21 and the socket
body 8. The guide tube 13 has a two part construction, with one
part being affixed in the plug body 21 and the other part being
affixed in the insulating insert 12. The guide tube will, when
joined together, slidably carry the welding rod or wire
therethrough. In the plug body 21, the guide tube terminates at a
sleeve or socket connector 13a which is internally flared or
tapered divergently toward the end of the guide tube at the end
face of the plug body, at the insulating cover plate 25. The guide
tube 13 in the insulated insert 12 of the socket body terminates in
a tapered insert or plug connector 13b which will fit within the
socket connector 13a and make an efficient electrical and physical
connection.
Other auxiliary utilities such as shield gas and electrical control
signals are also supplied through the plug connection. Accordingly,
a utility line or duct or gas passage 14 for shielding gas extends
through the plug connection in two parts and the ends of this gas
transmitting passage or line 14 are connected through hose fittings
24 and through socket and plug connectors 14a and 14b,
respectively. The socket connector 14a is arranged in the face
cover plate 25 and the insert or plug fitting 14b is affixed in the
end of the duct or passage 14 on the insulating insert 12 so as to
be joined to the socket connector 14a in a simple endwise thrust
movement. Although only one such fluid passage 14 is shown, an
additional utility connection, a water pipe and/or a compressed air
pipe may be additionally added in the plug connector, through the
plug body 21 and through the rotatable insert 12.
Additionally, a pair of electrical control leads 15 extend through
the plug connection. These leads are in two parts, one part in the
plug body 21 and the other part in the insulated insert 12. The
external control leads 15 are clamped by screws 16 to a split
insulating plate 23 and to the connectors 15a and 15b, respectively
disposed in the plug body 21 and in the rotatable insert 12. The
connector 15a is a sleeve or socket type flared connector to
telescopically receive and electrically join the plug or insert
connector 15b in the rotatable insert 12. The connector 15a is
insulated from the plug body by a sleeve extending from the cover
plate 25 to the split insulating plate 23.
A seal 50 is confined between the spring retaining ring 49 and the
nut 48 and seals against the external periphery of the
longitudinally displaceable and rotatable insulating insert 12.
The space 53 defined in the socket body 8 adjacent the nut 48 is
closed at its end remote from the plug body by a likewise threaded
portion 37 of the adapter pin 36. The smaller diameter portion of
the adapter pin 36 protrudes endwise beyond the socket body 8 and
is likewise threaded, and two nuts 38 and 39 are engaged on this
thread. The nuts 38 and 39 serve for the connection with the
electrode wire feed mechanism of which a bored mounting plate 40
and wire supply rollers 35 are shown. The adapter pin 36 is mounted
in the bore of the mounting plate 40, for the purpose of mounting
the socket body 8 on the plate, instead of the conventional wire
feed guide. If the main current is not supplied directly through
the mounting plate 40 then a cable lug terminal 41 with a bored
portion 42 is provided, as illustrated in FIG. 1. The cable lug
terminal is connected to a welding current feed cable 43, and its
bored mounting portion 42 is clamped between the larger diameter
portion 37 of the adapter pin 36 and the nut 38. When employing an
additional cable lug for supplying the welding current the bore of
the mounting plate 40 may be provided with an insulating
sleeve.
The adapter pin 36 is provided with a central bore through which
the guide tube 13 extends and is secured by a screw 46. The bore
end located within the portion 37 is of a larger diameter as shown
at 44. This bore portion 44 defines in conjunction with the smaller
diameter sleeve portion 47 formed integrally of the rotatable
insulating insert 12 a telescopic guide for the insert 12. The
sleeve portion 47 is rotatable in the bore portion 44 and may be
moved axially. A seal 51 is provided in an annular groove of the
bore portion 44.
The space 53 within the socket body 8 is sealed in a gas-tight
manner by means of the seals 50 and 51 and a sleeve 52. The
shielding gas supplied by a hose 55 passes through the hose fitting
24 into the sealed space 53. From the sealed space 53 the shielding
gas enters the feed line or passage 14 in the insert 12.
Within the space 53 are furthermore disposed a pair of electrical
leads 56 for the control current connected to the terminals 58 in
the socket body and compensating the rotational movements of the
insert 12. The control current is supplied to these terminals.
The plug connection is effected by moving the plug body into the
socket body. During this movement, the protective portion 20 of the
housing 2 is pushed over the rubber sleeve 3. The retainer pin 22
is guided in the longitudinal groove 27 and at the same time the
respective connectors 13a, 13b, 14a, 14b, 15a and 15b are joined.
Insulated insert 12 is displaced against spring 33. When a
sufficient plug connection has been achieved the insert 12 has been
moved sufficiently far so that rotation thereof is no longer
prevented by the detent pin 30 since in this position the detent
pin is disengaged from the longitudinal detent groove 31. When then
rotating the plug body relative to the socket body to achieve
tightening in the region of the conical surface 26 whereby the
retainer pin 22 engages the helical groove 28 the connectors 14a,
14b, 15a, 15b act as entrainment members so that the rotatable
insert 12 is positively rotated and the plug connections previously
established at the connectors are jointly rotated. Due to the
conical or cone-shaped configuration of the connectors 13a and 13 b
a good centering is assured. When the plug connection has been
made, the position will correspond to the one depicted in FIG. 3.
Thus the plug has been moved in the direction of its longitudinal
axis as indicated by the arrow A. The insert has simultaneously
been displaced in its longitudinal direction by a smaller amount as
illustrated by the arrow B. In the illustration of FIG. 3 the plug
body (refer to retainer pin 22) occupies the same position as in
the illustration of FIG. 2.
As may be seen from FIG. 4. in the present embodiment there are
provided three further supply lines, in addition to the welding
current line. These lines comprise the pair of electrical control
leads 15 the connectors 15a of which are shown in FIG. 2. These
leads form a part of an electrical control circuitry for activating
and deactivating the welding current. The figure furthermore shows
the connector 13a for the guide tube 13 and the connector 14a for
the shielding gas feed line 14.
In the form illustrated in FIGS. 5 - 8, the plug body mounts an
insulating attachment 21a in which a pair of flow passages or
conduits 61 and 62 for a coolant supply and return flow are
provided. These conduits terminate in tubular connectors or
fittings 61a and 62a respectively. Coolant hoses 63 and 64 forming
part of the hose assembly are connected by means of nipples 65 and
clamping rings 73 to the conduits 61 and 62 respectively.
In this form of the invention, the sleeve 4 of insulating material
is rotatably mounted externally on the socket body 8. A pair of
socket connectors 61b and 62b adapted to be interconnected with the
insert connectors 61a and 62a respectively are mounted on the
projecting portion 4a of the sleeve 4 which projecting portion 4a
is opposite the attachment 21a of the plug body when fitting plug
and socket bodies into one another. Seals 79 prevent any coolant
leakage in the interlocked position. The conduits 61 and 62 in the
sleeve 4 terminate in closed tubes 66 and 67 respectively. From
these tubes 66 and 67 extend lateral curved tube portions 68 and 69
at right angles to the pivot axis of the sleeve. Hoses 71 and 72
are slipped over the nipples 65 and held thereon by clamping rings
73. In the normal operational position, the hoses 71 and 72 extend
downwardly from the sleeve. By means of these lateral curved tube
portions 68 and 69 arranged laterally of and at right angles to the
pivot axis of the sleeve these members may be freely rotatably
entrained when rotating the sleeve.
A set screw 74 in the sleeve engages an annular groove 75 on the
socket body 8 and prevents axial movements of the sleeve. Another
screw 76 forms in conjunction with a ball 78 and a recess 77 in the
socket body a detent means (in the initial or normal operational
position) for the sleeve 4, this detent means assuring that all
connectors which are to be interconnected are in mutual alignment,
based upon the alignment of retainer pin 22 and longitudinal groove
27.
When plug and socket bodies have been fitted into one another from
the position shown in FIG. 5 the retainer pin 22 engages the
helical groove 28. All of the pairs of supply connectors 13a, 13b;
14a, 14b; 15a, 15b; 61a, 61b; 62a, 62b, are then mutually joined.
Additional endwise movement of the plug body 21 causes endwise
displacement of insulated insert 12, and causes pin 22 to pass
along groove 27 until groove 31 clears pin 30. When the plug body
21 is rotated relative to the socket body 8, plug and socket bodies
are mutually tightened, due to movement of pin 22 along the helical
groove 28, and the conical surface 26 will be urged against the
associated part of the socket body. The sleeve 4 rotates with plug
body 21 and insert 12 due to the interconnected connectors 61a,
61b; 62a, 62b on the sleeve. As sleeve 4 is turned during assembly,
the fluid supply tubes 66, 67 turn with the sleeve, causing limited
movement of hoses 71, 72. At the end of this rotational movement of
approximately a quarter turn all of the connector pairs are tightly
engaged.
For releasing the plug connection the plug is rotated in the
opposite direction. Thus insert 12 and sleeve 4 return into their
initial position shown in FIG. 1. The sleeve is stopped and
retained in its initial position by the ball 78. The initial
position of the insert 12 is defined by the detent pin 30.
When rotating the sleeve 4 in the direction of the arrow C (FIG. 7)
or in the opposite direction the curved tube portions 68 and 69 are
rotated in the same direction as sleeve 4. The vertical position of
the curved tubes 68, 69 with respect to the direction of rotation
does not present any significant obstruction to the rotational
movement. The hoses 71 and 72 normally extend downwardly.
* * * * *