US2951111A - Lead wire tape - Google Patents

Description

Aug. 30, 1960 Y 'E. P. ANDERSON ETAL 2,951,111

LEAD WIRE TAPE Filed Jan. 16, 1957 1 INVENTORS I EDWARD P. ANDERSON BY WALTER F. DORING K i MM 3M) 5 ATTORN YS United.

N.J., assignors, dustries,

F, Daring, Livingston,

h mesne assi nrnents to Inc., Newark, NJ, a corpo on oi Dela Filed Jan. 16, 1957, Ser. No. 634,465

3 Claims. (lCl. 174-117) This invention relates to a novel lead wire tape which finds utility in applications in which it is necessary to subject a lead wire to great ditlerences in temperature.

More particularly, the novel lead wire tape of this invention finds application in connecting transducers to recording instruments where the transducers are used on rockets, missiles and the like. Transducers are customarily cemented to the exterior metal skin of rockets or missiles, and is then necessary to run lead wires from the transducers to the recording instrument mounted inside the rocket or missile body. lead wires must be cemented to the metal skin also since other forms of bonding such as rivets and the like cannot be used.

As the rocket or missile travels through the air, the air friction causes the metal skin to become extremely hot thereby resulting in expansion thereof and, accordingly, it is necessary to compensate for the dificrence between the coeflicient of expansion of the metal skin and the coefiicient of expansion of the lead wire. Due to the wide range of temperature to wh'ch the rocket or missile is sub jected, the dillerence in coefiicient of ex a on between the missile slain and the lead wire su em to result in the lead wire breaking or pulling loose from the contacts unlessprovision is made to co ipensate for the difference in coefiicient of expansion.

In accordance with the present inventi ties resulting from this difference in one sion are overcome by mounting be lead a fabric tape. The tape may be torn of fiber which is unaffected by peraturcs, such as glass or quartz fiber and the like. Tne tape is woven with a relatively loose mesh so that when it is afilxed to the skin of a missile, for cxar ple, a suitable cement will flow through the interstices in the woven tape, thereby securing the woven tape to the missile skin. The lead Wire or wires are sewed to the woven tape by means of threads, which are formed from sim temperature resistant fibers to those used in the woven tape, and the lead wire is secured to the tape in the form of a sinusoidal curve, or any other curve taking a wave form, and thus when the lead wire expands and contracts, the expansion and contraction is taken up in a lateral r er than a longitudinal plane so that there is no possi' nty of the lead wire breaking or becoming detached from the contacts or the surface to which it has been attached. The lead wire may be of any type desired, and may, for example, consist of Constantan wire run axially through a copper tube, the Constantan lead wire being insulated from the copper tube by means of an insulating material uch as aluminum oxide refractory dust swaged to a compact condition between the two conductors. Other insulating materials such as glass or ceramic materials may also be used.

The entire lead wire tape assembly may be bonded to the metal skin of a missile or the like, using a suitable bonding material such as a cement comprising a mixture of silicone resin, mica, and cristobalite silica, such as that described in copending application Serial No. 633,382, filed January 10, 1957.

the difficulient of expanwire or wires on ed from any type Referring to the accompanying drawing in which one fronted 39, 19

rile, t ZS tape base having a pair of coaxial cables 4 and d sewed thereto by means of the threads 3 and it. The

coaxial cables are sewn to the woven tape base in the form f a sinusoidal curve, or any other curve taking a wave form, so that the adhesion of the coaxial cables and tape to a metal surface is not impaired due to the difference in coefiicient of expansion of the metal cables a"l that of the metal surface.

in the embodiment shown, the coaxial leads consist of No. 28 Constantan wire run axially through a copper tube having a diameter of 6.043 inch, the Qoiatantan lcad bein insulate-d from the outer tube by aluminum oxide refractory dust swaged between the t o conductors.

it will be obvious to those sxillt l in art that many ic ions may be de within the scope of the preseat 1 ven ion without departing from. the spirit thereof, vention includes all such modifications.

wire tape for high temperature applications risint an inelastic open wov bric base made of a material selected from the group consisting of glass and quartz fibers, at least one temperature resistant lead 2d means comp g stitch along the length of ire for loosel securing said e to said base in a a y wave-like form, the wire having a length over- 1g said fabric which is greater than the fabric base to .ch it is secured, w" ereby the *pansion and contrac- 1 of said wire occurs in a lateral rather than a longiiai plane.

2. A lead wire tape for 1 comprising an inelastic open we len fabric of a material selected from the group consis of glass quartz fibers; at least one high t perature resistant osite wi e, including an inner connector oi low temcoefficient of resists; mate an outer rnetallic sheath, and re aterial spac g said conductor and said shea cans comprisin stitching the length of said e for loosely securing said e to said base in '1 gene' y wave-like form, the Wire a length over high lications e made d wire tape for high temperature applications an inelastic open woven fabric base made of al selected from the group consisting of glass and -tz fibers, at least one high temperature resistant lead was having a low temperature coefficient of resistance, and means comprising stitching along the length of said wire for loosely securing said wire to said base in a generally wave-like form, the wire having a length overlying said fabric which is greater than the fabric base to which it is secured, whereby the expansion and contraction of said wire occurs in a lateral rather than a longitudinal plane.

References Cited in the file of this patent UNITED STATES PATENTS OTHER REFERENCES Fiberglass (publication), copyright 1944, Owens-Corning Corporation, Toledo 1, Ohio, Catalog No. EL44-7, pages 11-14.

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