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.