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Патент USA US2406346

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Aug. 27, 1946.
Filed Sept. 11,l 1943
...- ||
Patented Aug. 27, 1946
Stephen.N.-Buchanan, Washington, D. C., assign
or to Aircraft-Marine Products, Inc., Elizabeth,
N. .J., a corporation'of New >Jersey
Applicatiomseptember 11, 1943„'Serial Nm 501,909.
(Cl. 173-269) ì
‘II-’hisrinvention relates to cableconnectorsand
more specifically to a connector which may ybe
attached to an electrical conductor to effect- a
strong; low-resistance connection or `may at will
„be detachedtherefrom Without the useof special
and configured with-an expandingthickness, @the ,
collet‘may be drawn into >thesleeve bymeans
of the collet nut with-a wedgingaction resulting
from the expanding thickness at the-,opposite end
of the -collet. If the collet >itself is _first tele
scoped over thebareend of a~wire cable oran-y
.The present invention isparticularly well suit
electrical lconductor before the collet »nut `is
tightened, the wedging ‘actiony may be used. >to
eiîect an excellent mechanical Aengagen'l-ent.and
ed to use with stranded electrical conductors or
cables, but obviously its application is notlimited
to conductors .of thestranded type. Heretofore
electrical connectors for ,binding conductors of
electrical contact .between‘theeollet.andtheelec
trical conductor and to form as tight avbond as
this type to :binding posts, terminalcontacts, and
.the like, either have. required permanentlattach
.ment to the electrical conductors, as bybrazing
may be desired ‘between the -electrical conductor
and a binding post to which the electricaleon
or by soldering, or .else .they have involved a -
_mechanicallocking or clampingactioncallingfor
.the use of special tools and fixtures in order to
nector vmay be clamped. Moreover,- Vany subse
quent pull‘on the cable, etc., will tend, by wedg
ing the collet more tightly into the sleeve, to
vtighten its grip on the cable, etc.
make a sufficiently tight ïloond.,v The electrical
connectors which were permanently ,attached ,to
‘the electrical conductors could,_l‘.or many pur
poses, be made sufliciently strong and to give an
electrical bond of .low- conductivity,y but they
In this speciñcation and the accompanying
drawing, I have shown and described a preferred
embodiment of `my invention and lvarious modiñ
cations thereof; b-ut it is to be understood 'that
rsuffered the disadvantage that' once they were `
'attachedythey permitted of ‘no subsequent rear
these are not intended to be exhaustive nor limit
ing of the> invention, but on the contrary-are
given for purposes of' illustration in order that
rangement; that is, ‘they could not readily be T25 others skilled in the lart may fully understand
'disconnected `from the conductor and >used else
the invention and the principles thereof and the
where on 'another conductor 'nor 'could the length
manner of applying it in practical use so .that
of the electrical conductor later be changed by
they Vmay‘modify and adapt it in »various forms',
cutting 01T the end of the ‘conductor- and vreat
taching the electrical connector. The majority 30
lof the electrical vconnectors heretofore known
which have depended upon some' mechanical
a particular use.v
In the accompanying drawing,- in which t a
satisfactory form ‘of the inventionfor achieving
clamping action either >did not give'asuiliciently
the above objectives is set forth:
Figure 1 is an end elevation of a collet embody
'tight electrical bond or else they were toocom
plicated or cumbersome to be of great practical
It is an object of the present invention to pro
vide an electrical connector whereby an electrical
conductor may be connected to an electric termi
nal in a practical manner and wherein the elec
>each as may be‘best suited to the .conditionsf‘of
ing the invention;
Figure 2 is a side elevation of thezcolletfshown
in Figure 1;
Figure 3 is an elevation of the collet shown in
Figure 1 but taken from the opposite end;
Figure 4 is a sectional elevation of the collet
trical connector may be disconnected from the
shown in Figure 2;
electrical conductor easily and Without the use
Figure 5 is an expanded perspective view of
of special tools. Another object is the provision
the collet shown in Figures 1 through 4 in» associ
of a collet, as will be described, for use in estab
ation with a ferrule-like sleeve and collet nut and
lishing and maintaining an easily broken and 45 in
accordance lwith the invention;
rearranged electrical connection. Other objects
Figure 6 is a sectional elevation of the parts
will be in part pointed out as the description
shown in Figure 5 in assembled relationship and
proceeds and will in part become apparent there
clamped upon the end of an electrical conductor; 1
'I’he present invention results from' the dis
Figure 7 is an end elevation of the parts shown
covery that a collet, as will be described, may be
in Figure 6.
positioned within a ferrule-like sleeve and that '
With reference to Figures 1 through 4, a collet
if one end of the collet projects through the sleeve
l0 is shown having an externally threaded por
and is threaded so as to receive a collet nut, and
tion Il toward its right-hand end (see Figures
if the other end of the collet is properly slotted 55 2 and 4) and being provided with a gradually in
to‘ give a bright, low-resistance Y electrical con
creasing diameter toward its left-hand end. The
end of increased diameter is slotted, as at 26, and
these slots (taper somewhat toward the longitu
During the process of drawing the collet into
the ferrule some of the strands of the conductor
may be caught within slots 26. These strands are
dinal center of the collet so that they'are nar
rower toward their innermost points. The in
terior of the collet is serrated, as at 32, within
flattened and extruded by the tightening of the
collet and aid in sealing> any interstices' which
its slotted, enlarged portion and each endv Of the
cylindrically. shaped passage through the collet
might otherwise remain within ythe slotted collet.
Hence it is evident that an electrical'connector
in» accordance Withthe instant invention
, a slightly ilared or funnel-shaped end. The lefthand funnel-like inner enlargement of the collet>>` ‘ and as above described is admirably suited for
vis interiorly enlarged somewhat so as to afford
' 'easy connection upon or disconnection from an
(see Figures 2 and 4) is indicated at SBan‘d af-`
. electrical conductor and that when connected a
fordsa clearance for a purpose to be, described,
' mechanical engagement of highV strength can be
The combination of slots 26' Withrthe >increasing
diameter and thickness of ` the Vferrule providesV
Wedge-shaped segments 28 toward the left-hande I
‘As various embodiments may be made of the
above invention and as changes mightV be made
in the embodiment above set forth, it is to be
understood that all matter hereinbefore set forth
end of the collet as viewed- in Figures 2 and 4.
Figure 5 shows collet I0 in association with ~.
a terminal connector 2E! provided with a ferrule
or shown in the accompanying drawing _is tobe
2_4 and a yCollet nllt I2. n rIY‘he threaded'portion of 20 interpretedvas
illustrative and> not inl a limiting
collet»Y I0 Yis inserted through `ferrule 24 so that
collet‘nut I2 may be'screwed onto the threads
of the collet thus drawingcollet Illinto ferrule
24. Connector 20 is of thetype illustrated and
claimedin the copending application of> James O.
Johnson',- Serial No. 484,167, iiled April 23, 1943.
I claim:
A connector for wire and the like which com- `
prises: a'dihedral member of deadl soft, malleable
sheet copper o_r the like having parallel sides _nor
mal to thedihedral angle adapted to receive a
As pointedV out in said Johnson application, this
hand wrench, and having a female opening
connector advantageously is made from dead soft,
through one of the angularly related portions
Ymalleable sheet copper.
Figures’ß and? illustrate the manner in which 30 thereof adapted to receive a collet; a collet hav
ing an opening therethrough adapted to lit over
the bared 'end I6 of a conductor I8 maybe tele
Wire or like member to which it is to be con@
scoped Within colletl I0 in association with con
nectedand having a- smaller externally threaded
nector 20 and collet lnut I2, as' indicated in Fig
end> portion of substantially uniform external
ure 6, by tightening nut I2 upon the threaded
portion of the collet. The wedge-shaped seg 35 diameter ñtted into and extending through said
ments 28 are forced inwardly intointimate con
female opening in a directionfaway from the 'other _
tact with the wire of the conductor by means of
the wedging «action effected by relative move
ment of the' collet with respect to ferrule v24.
said collet tapering to an _external diameter sub
Tapered slots 26 'permit'the portions of greater
angularly related portion, Ythe opposite end lof
stantially' largerlthan said female' opening and
lto substantially 'increased wall thickness, the
Walls of said tapering end ~being Yslotted _to per
mit its compression to smaller diameter but the
30 gives some relief at'the thicker portions of the
width of the slots being limited to less than would
segmenta'rbutY the dimensions of the îc'ollet >are
permit said tapering end to be drawncompletely
such "that it is 1 impossibleY to draw the collet
completely within ferrule 24.» In one' satisfactory 45 into the female opening, the interior surface of
Ythe tapering- end beingserrated for _secure ver1
V>form of the invention?the cross-'sectional area of
gagement with the wire, and the interior surface
the central opening in the >larger end of the col
let, when :compressed as much as possible, is less
at thersmall'er end being'smooth and smoothly
t than the cross-sectional area> of the central open
roundedy at its edge; and a'nut threaded onto
ingY in Vthe smaller end of 'the collet by about l5 50 said smaller en'd of the collet'and bearing against
thickness to’be compressed radially. «Clearance
to >20 per cent. The over-all area at the larger
Vend may likewise be about>15 to _20 per cent greater
than that of the smallest part of thejhole'inthe
The sharp edges formed by slots 26 are advan 55
tageous, in that they cut into the sidewalls of
ferrule 24, and through any oxide ñlm thereupon,
said female member whereby to draw said taper
ing end partially into the femaleA opening and
thereby to reduce its internaldiameter by clos
ing its slots.V
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