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Патент USA US2408278

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Sept. 24, 1946.
2,408,276
c. J. sHRADER
ELECTRICAL GROUND CLAMP
Filed March 51, 1943
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C halmdn John VSh‘rader l
. INVENTOR
,By
ATTORNEY
Patented Sept. 24, 1946v
2,408,276
UNITED STATES PATENT oEFICE
Chalmon John Shrader, Henrico County, Va.
Application March 31, 1943, Serial No. 481,367
B'Claîms.> ' (Cl. 173-273)
This invention relates to electrical ground
clamp or connections and more particularly to
arc Welding connections.
One of the objects of this invention is the pro
vision of a clamp adapted to be connected to
various sizes of conductors.
y
2
4--5 open and may be closed upon said metal
thus securing the device to the metal in electri-‘
cal circuit.
`
To secure the device, for instance, inside an
angular metal bar C, members I and 2 are pulled
against spring tension and contacts II--I2 move
toward each other and may be inserted in tube
Another object of this invention is the provi
sion of an adjustable clamp.
, and electrical contact thus made; as illustrated
Other objects and features will more fully ap
pear from the following description and accom
10 which current passes through conductor A from
panying drawing, in which:
generator B, through the angular bar C and de
Fig. 1 is a vertical side View; Fig. 2, a sectional
portional side view; Fig. 3, a top plan view, and
Fig. 4, an electrical circuit.
in the schematic electrical diagram of Fig. 4, in
`
Y vice and returning to the generator via conduc
tor I8.
.
Magnetic Iblocks 20y are respectively secured to
Referring to the drawing, an angular male 15 members I-2 and adapted to hold the device in
member I is disposed in slidable fashion in an
a iixed position against any material that is at
angular-female member 2 and is provided with
tracted by said blocks.
'
a ball and socket joint l3 to which is connected
Having described this invention, what is
a contact 4.
claimed is:
A contact 5, similar to 4, is connected to a ball 20
1. In an electrical connector, a tubular mem
and socket joint 6 disposed in one end of a rod
'ber having a slot through its side wall longitudi
'I slidable through end 8 of the female member
nally of said member, a hollow elongated mem
2, and adapted to lbe secured by a lock-nut 9.
ber, a contact mounted on said member and eX
Contacts 4 and 5 are held together by a spring
tending through said slot, a tension spring within
I0; the ends o1' which are respectively secured to 25 said hollow member having its ends secured to
members I and 2.
said members slidably ñtting within said tubular
A contact member l I is secured near one end
member, each of said members having an arm
of member I While a contact I2 is disposed near
rigidly extending laterally from the free end
one end of member 2 as shown in Fig. 1. Con
thereof, a first gripping element mounted upon
tact member II engages slot I3 throughout its 30 the free end of one arm, a rod connected with
length to prevent circumferential displacement
the free end of the other arm for adjustment
with respect to members I and 2. Welding of
toward and from said element, means for secur
member II to sleeve I through slot I3 of member
ing said rod and its arm in adjusted position, and
2, may be accomplished by applying one termi
, a second gripping element mounted upon the end
nal of a source of current to sleeve I through such 35 of said rod adjacent said i’irst element.
slot and the other terminal of the source to
2. In a connector as dei-ined in claim 1, eac-h of
member II, thereby completing a circuit and ef
fecting the welding of member II to sleeve I, in
the manner well known in the resistance welding
said gripping elements being universally pivot
ally mounted upon said one arm and rod.
3. In an electrfical connector, a tubular mem
art. Furthermore, it is obvious that the shank 40 ber, having a slot through its side wall longitu
of part II may -be circular and have its end
dinally of said member, a hollow mem-ber tele
threaded to engage a correspondingly threaded
scopically ñtting said tubular member, a tension
hole in sleeve I.
spring within said hollow member and having its
Female member 2 is provided with a toothed
end I4 adapted to scrape rust and non-conduct
ends secured to said members, respectively, a first
clamp element having a shank extending through
said slot and there secured to said hollow mem
a swiveled hook I5 having a pair of resilient legs
ber, a second clamp element having a shank se
IS-I‘I is adapted for being clamped to the de
cured to said tubular member adjacent its end
vice at any suitable point so that said hook may
receiving said hollow member, a parallel arm
be secured to an object and thus support the de 50 projecting laterally from the free end of each of
ing materials from a conducting material; while
v1ce.
An electrical conductor I8 is connected to male `
member I and adapted to conduct electrical cur
said members, a rod mounted on one said arm for
adjustment toward and from theV other arm,
means carried by said arm and securing said rod '
.
in adjusted position, and cooperating contact ele
It is obvious from the foregoing that if a piece 55 mentsA universally pivoted upon said other arm
of metal is to be welded then by pulling members
and an end of said rod.
I and 2 apart, against spring tension, contacts
CHALMON JOI-IN SHRADER.
rent.
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