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Dec. 24, 1946.
A. E. BRICKMAN
'
2,412,948
DETACHABLE TERMINAL FITTING FOR STRANDED—WIRE STRUCTURE
Filed Feb. 2, 1943
2 Sheets-Sheet 1
Dec. 24, 1946.
'
A. E. BRICKMAN
‘
2,412,948
DETACHABLE TERMINAL FITTING FOR STRANDED-WIRE STRUCTURE
Filed Feb. 2, 1943
FIE
2 Sheets-Sheet 2
’
FIE-9
F1512.
rimv
a
INVENTOR.‘
2,412,948
- Patented Dec. 24, 1946
.11
UNITED STATES PATENT orrics ' "
DETACHABLE TERDHNAL FITTING FOR
STRANDED-WIRE STRUCTURE .
Alan E. Brickman, New Haven, Conn., assignor to .
The American Steel and Wire Company of New
Jersey, a corporation of New Jersey
Application Fejruary 2, 1943, Serial No. 474,416
I‘ 6 Claims.
(Cl. 24-12215)
2
1
assembly.
- Fig. 12 is a view showing an assembly of the
second embodiment of the invention.
If the terminal becomes worn or dam
tion of the attached terminal. These large aper
tures weaken the structure and/or permit unde
10 enlarged broomed section 6 at the end thereof
‘
, ‘In the present ?xed terminals there is no im
Imediate provision for changing the overall length
‘ oi the cable assembly.
Such change is often nec
essary due to lengthening resulting from struc
, tural stretch of the cable or from wear, which is
particularly noticeable in cable connections in
volving marked changes in course of direction, as
accomplished with sheaves. The present used
cable connector with ?xed terminals must, there
’ tore, include a turnbuckle or a stud ?tting with
nut vtakeup on at least one end to compensate
for the changes in cable assembly length.
It is an object of this invention to furnish a
" detachable terminal ?tting which permits greater
__ . ?exibility oi.’ terminal design.
»
structure'to which a ?tting'is to be attached.
The wire structure is broomed to- obtain a bulb
14 a short distance from the end thereof and an
_Ysir_a_b1e in?ltration of moisture, gases or foreign
materials and are especially detrimental when
used on aeroplanes.
,
Referring more particularly to the drawings,
reference numeral 2 indicates a stranded wire
'. ‘aged, the, whole assembly must be replaced. All
' . aperturesthrough which the cable passes must be
. equal to or greater thanthe largest cross-sec
.
Fig. 11 is a view similar to Fig. 10, but showing
the ?tting with the threads ‘formed thereon, and
This invention relates to a detachable’ terminal
‘?tting, and inparticular to such ?ttings used on
stranded wire structures. At present all termi
nals are ?xed to the end of the stranded wire
“ structure so as to become a unitary part of the
as shown in Fig. 2. The end or the wire structure
is then inserted into the cavity of a die and
molten metal is injected into the"_cavity of the -
die to produce a ?tting 8 bonded to the stranded
15 wire structure as shown in Fig. 3.
The ?tting
has threads Ill cast thereon which are cleaned
and ?nished by running a Dardelet thread die
thereover.
A detachable terminal ?tting it having a bore
20 it formed therein is produced by the injection .
method of die casting. A Dardelet thread i8 is
cast therein and a thread tap is run over the cast
thread to clean and ?nish the working surfaces.
A set screw 20 is then screwed into the bottom
' ‘ of the bore l6.
By adjusting this screw the bot
toming point may be changed as desired.
The operation of the Dardelet‘ thread. will be
apparent from an inspection of Figs. 6- and '7.
The root portion ‘22 of the male thread isv tapered
~
so as‘to cause an incline in the direction of the
“Another Object is to furnish a terminal ?tting 30 end and there vis a corresponding taper 24 on the
which may be readily removed or replaced.
crest portion of the female thread. The two
A iurther object is to furnish a terminal ?tting
members may be readily screwed together until
having provisions for changing the overall length
they meet with resistance, which in this instance
of the cable assembly.
takes place when the ?tting 8 abuts the plug 20.
These and other objects will be more apparent 35 With the additional torque, the crest taper pro
alter referring to the attached drawings in which:
duces a great compressive force on the root taper
Fig. 1 is a view or a stranded wire structure
oi! the cable member, which, in turn, will trans
used in the invention;
1
mit the compression-tomes onto the stranded wire
Fig. 2 is a view or such a wire structure after
structure to increase the grip on the stranded
its end has been broomed;
_ 40 structure to better vwithstand the tension which
Fig. 3 is a view, partly in cross-section, showing
will be applied to the assembly. Fig. 7 shows the
a ?tting attached to the stranded wire struc
position of the thread when additional torque is
ture;
applied. To provide changes in the overall as
the
terminal
?tting
of
the
Fig. 4 is a view of
sembly length, the plug 20 may be adjusted in
invention;
Fig. 5 shows the ?tting assembly;
Fig. 6 is an enlarged sectional view of a detail
or the invention;
Fig. 'l is a view similar to Fig. 6 showing the
parts in a different position;
Fig. 8 is a view of a ?tting used in a second
embodiment of the invention;
>
Fig. 9 is an end view 01 the ?tting of Fig. 8;
wardly or outwardly by means of a set screw
wrench 26. A second embodiment of the inven
tion is disclosed in Figs. 8 to 12. In this embodi
ment a tubular nickel steel seamless ferrule 21
60 provided with a bore 28 having a diameter com- ‘
parative to the outside diameter of the wire struc
ture is slid over the wire. The ferrule is then
swaged over the greater part of its length'so as
Fig. 10 shows the ?tting of Fig. 8 swaged on \ , to cause ?ow of metal into the external inter.
the wire rope;
5d stlces and in ?st grip with the stranded wire
(
2,412,948
4
structure as shown in Fig. 10. The ?nished wall
3. A terminal ?tting for stranded wirestruc
tures comprising a thin walled compressible male
?tting cast about said stranded wire structure,
section on the ferrule in this construction may be‘
extremely thin,‘ as it becomes augmented with
the values produced by the‘ detachable terminal
and having a Dardelet thread formed on‘ the ex
H as described. above. The unswaged' length 29'
of the ferrule ?ts closely about the stranded wire
and functions as a vibration dampener. In the
usual terminal ?ttings of the‘ swaged assembly
ternal- surface thereof, and a hollow ?tting hav
ing‘ a complemental Dardelet thread formed. on
the internal surface thereof and threadedon said“
?rst-named ?tting; said complemental threadsv
being tightened to compress‘the compressible ?t
type there is a taper-of 12 degrees inside and out
or 24‘ degrees outside 10!‘ a short distance back 10 ting whereby the gripping force on the'wire struc
tures is increased.
4. A terminal ?tting for strandedwlre structures comprising a thin walled compressible male
from the end of the cable hole so that there will
be a progressive diminishing of grip on the wire
l-tstructure. This method of evading a line of re
straint to cable‘ vibration is‘ not as effective as
the method disclosed above. After the ferrule
21- is swa'ged onto the wire, a Dardelet thread 30:
is cut'on‘ the swagedportion and the terminal ?t
ting vll is then screwed on the ferrule 21. It will
?tting'ca'st about ,said stranded wire structure,
is
and having a Dardelet thread formedon the ex-'
ternal surface thereof, and a hollow ?tting hav
ing a‘complemental Dardelet thread formed on"
theinternal surface thereof and threaded on said
bevv apparent that any type of terminal ?tting may
?rstenamed ?tting, said complemental threads
be substituted for the one shown.
20 being tightened to‘ compress the compressible ?t
ting‘ whereby the gripping force on the wire ‘struc
While‘ two embodiments of the invention have
been‘ shown and described, it will be'apparent to
tures is increased, said hollow ?tting havinggan
one skilled in the art that otherembodiments and
adaptations may be made without departing from
adjustable bottom therein to provide changes in
the scope of the attached claims.
5. A- terminal ?tting for stranded wire 'structurescomprising a thin walled compressible irial'e
?tting swaged to and surrounding the wire struc
tureand having a Dardelet thread formed-on mo
external surface thereof, and a hollow ?tting hav
1. A terminal ?tting for stranded wire struc
tures comprising- a thinwalled compressible ?t
ting surrounding and in intimate surface con
tact with said stranded wire structure and hav
ing; a Dardelet thread formed on the external
surface thereof, and a hollow ?tting having a
complemental Dardelet thread formed on the in
ternal surface thereof and threaded on said first
named ?tting, said complemental threads being 35.
tightened to compress the compressible ?tting
the'a'ssembled length of the terminal ?ttingi '
ing a complemental Dardelet thread vformed‘ on
the internal surface thereof and‘threaded on said“
?rst-named ?tting, said complemental ‘threads
‘being tightened to compress the compressibl'ej'?t
ting whereby the gripping force on the wire" struc-'
tures is increased.
'
' ' "
6. A terminal ?tting for strandedwire struc
whereby the gripping force on the wire structures
is increased.
?tting swaged to and surrounding the wire struc
2. A terminal ?tting for stranded wire struc
tures comprising a thin walled compressible ?t
ture and having a Dardelet thread formed on the
external surface thereof, and a hollow ?tting hav
ting surrounding and in intimate surface contact
ing a complemental Dardelet thread formed on
the internal surface ‘thereof, and threaded on
with said stranded wire structure and having a
Dardelet thread formed on the external surface
thereof, and a hollow ?tting having a comple
mental Dardelet thread formed on the internal
surface thereof and threaded on said?rst-named
?tting, said complemental threads being tight
ened to_ compress the compressible ?tting where
bythe gripping force on the wire structures is
increased, said hollow ?tting having an adjustable
bottom therein to provide changes in the assem
bled length of the terminal ?tting.
tures comprising a thin walled compressible'male
said ?rst-named “?tting, said complemental
threads being tightened to compress the com
pressible ?tting whereby the gripping force on
the wire structures is increased, said hollow ?t
ting having an adjustable bottom therein to, pro
vide changes in the assembled length of the
terminal ?tting,
ALAN E. BRICKMAN.
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