US2160313A - Wire joint, especially for electrical shot-firing outfits or similar provisional electrical circuits - Google Patents

Wire joint, especially for electrical shot-firing outfits or similar provisional electrical circuits Download PDF

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Publication number
US2160313A
US2160313A US129331A US12933137A US2160313A US 2160313 A US2160313 A US 2160313A US 129331 A US129331 A US 129331A US 12933137 A US12933137 A US 12933137A US 2160313 A US2160313 A US 2160313A
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United States
Prior art keywords
wires
bushing
wire
joint
electrical
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Expired - Lifetime
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US129331A
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English (en)
Inventor
Norres Wilhelm
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Individual
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Individual
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Publication date
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Publication of US2160313A publication Critical patent/US2160313A/en
Anticipated expiration legal-status Critical
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
    • F42D1/04—Arrangements for ignition
    • F42D1/045—Arrangements for electric ignition

Definitions

  • outfit and especially of the ignition-circuit thereof is of considerable importance.
  • outfits of this kind frequently a greater number of shots has to be fired simultaneously and in consequence thereof an appropriate number of connections and wire-joints will be necessary.
  • Each of these connections or wire-joints moreover, has to ful- In the first place there must be a good contact in the wire-joint to avoid an undue resistance at the contact points and unfavorable conditions resulting therefrom with regard to the total resistance of the ignition circuit including the shot-firing fuses forming part of the outfit.
  • the wire-joints must be of sufiicient mechanical strength to prevent separation of the wires by a pull which may occasionally be exerted thereunto.
  • the wires connected by the joint must be completely insulated towards the outside, as otherwise a shunt to said wires may eventually arise or some current source other than that of the ignition circuit may act on said fuses.
  • the connection between the wires should permit of being made in a simple manner and within the shortest possible time.
  • the wire-joint at the same time must comply with all four of these requirements, of which the last-mentioned is most essential, especially in shot-firing outfits working below ground.
  • the wire-joints for shot-firing outfits or similar provisional electrical circuits are made by inserting the bare ends of the wires to be connected with each other into an insulating bushing closed at one end thereof and provided with an interior lining of conducting material, and thereupon said bushing together with said lining and the bare end of the wires inserted thereinto is sharply bentto provide a firm and reliable joint to be easily and conveniently made by hand without the use of any implement, such as pliers.
  • the insulating effect of the wire-joint may be further increased by using the aforedescribed bushings with a filling of soft or plastical insulating material consisting, for instance, of a tar-like mass, Vaseline, or the like.
  • a filling of this kind does not run out of the bushing either during handling or during transport.
  • said filling will protrude from the orifice of said bushing and this will safely prevent access of water to the bare ends of the wires in the joint, even if the joint is for some longer time kept in water.
  • Fig. 5 a diagram showing an electrical shotfiring outfit including wire-joints according to my invention.
  • my novel wire-joint consists 0 of a bushing a of insulating material, said bushing being closed at one end thereof and comprising a tube or lining b of conduction material provided in the interior of said bushing a, the end a of the insulating bushing projecting be- 5 yond said tube or lining b.
  • the bare ends ofv the wires 0 and d to be connected with each other are inserted together with'the ends of their insulating covering into said tube or lining b and thereupon said 0 bushing a, together with said lining b and the ends of the wires c and d therein, is sharply bent in the manner indicated in Fig. 3.
  • the insulating material used for the bushing a is a material which may be bent into a different shape and then holds its shape, and such that 5 bushing 0. together with the lining b and the wires 0 and d therein is likewise sharply bent to produce a conducting and strong connection between the two wires 0 and d.
  • the ends of the two wires are also firmly surrounded by the conducting lining b, thus securing a good electrical joint even in case the bare ends of the wires are not in full and immediate con- ,tact with each other.
  • this form of joint is likewise suitable to resist against a pull 5 exerted onto the two wires interrupting the connection and even in case of a strong pull connection will be maintained in contradistinction to the aforementioned wire-joint made by twisting.
  • the construction of the wire-joint shown' in Fig. 2 is likewise suitable to resist against a pull 5 exerted onto the two wires interrupting the connection and even in case of a strong pull connection will be maintained in contradistinction to the aforementioned wire-joint made by twisting.
  • Fig. 6 I have shown an electrical shotfiring outfit comprising several fuses placed in the ground and connected in series with each other by means of wires and wire-joints a ⁇ , a a and a.
  • the circuit including said fuses in series is connected to the ignition wires e and f eventually with insertion of a surplus of wire g.
  • wire-joints constructed according to my present invention are of great importance in connection with provisionally installed ignitioncircuits forming part of shot-firing outfits, said wire-joints making it possible to establish a good, well-insulated and mechanically strong electrical joint between wires without the use of any, tool.
  • a further advantage consists therein that the wire-joints made ,at the ends of the ignitioncircuit or at the ends of said surplus of wire g may conveniently'be disconnected, at the same time retaining the bare wire-ends in condition to be used for making further connections. Disconnection of the wires may solely be attained by straightening out the bent bushing a and withdrawing therefrom the ends of the wires, which may likewise be done without the use of any tool.
  • a wire joint for connecting wires of electrical ignition circuits for shot-firing outfits or similar provisional electrical circuita'said joint comprising a tubular shaped bushing of insulating material, a pair of insulated wires having their ends free of insulation and exposed, engaging the open end of the bushing, only the insulated. parts of the wires protruding from the bushing, and a conducting lining interiorly of said bushing and contacting with said exposed uninsulated ends of said wires, said bushing together with said conducting lining being sharply bent, with the ends of the bushing adjacent each other, to remain in the position to which the bushing was bent.
  • a wire joint for connecting wires of electrical ignition circuits for shot-firing outfits or end a pair of insulated wires having their ends free of insulation and exposed, engaging the open end of the bushing so that only the insulated parts of the wires protrude from the bushing, and a conducting lining interiorly of said bushingand contacting with said exposed uninsulated ends of said wires, one of the wires being fixedly connected with said conducting lining, and the other wire inserted thereinto, said bushing together with said conducting lining and said other wire therein being sharply bent, with the two ends of the bushing adjacent each other, to remain in the position to which the bushing was bent.
  • a wire joint for connecting wires of electrical ignition circuits for shot-firing outfits or similar provisional electrical circuits comprising a bushin g ⁇ of insulating material closed at one end thereof and open at the other end, a pair of insulatedwires having their ends conducting lining being sharply bent so that the two ends of the bushing are adjacent each othef and remain in the position in which the bushing was bent, and a plastical insulating material filling said bushing to prevent conducting materials from entering the bushing and contacting 5 with the exposed ends of the wires.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Insulating Bodies (AREA)
US129331A 1936-03-12 1937-03-06 Wire joint, especially for electrical shot-firing outfits or similar provisional electrical circuits Expired - Lifetime US2160313A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2160313X 1936-03-12

Publications (1)

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US2160313A true US2160313A (en) 1939-05-30

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US129331A Expired - Lifetime US2160313A (en) 1936-03-12 1937-03-06 Wire joint, especially for electrical shot-firing outfits or similar provisional electrical circuits

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US (1) US2160313A (xx)
BE (1) BE420380A (xx)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2649735A (en) * 1948-07-15 1953-08-25 Hercules Powder Co Ltd Lead wire for initiating devices
US2803695A (en) * 1951-05-03 1957-08-20 Amp Inc Closed end connector
US2862041A (en) * 1955-03-16 1958-11-25 Lektro Thermal Corp Splice for electrical wiring
US3226471A (en) * 1962-08-10 1965-12-28 Stephen N Buchanan Insulated splicer cap
US3585275A (en) * 1970-02-19 1971-06-15 George W Gillemot Kit and method for encapsulating conductor splice connections
US3838206A (en) * 1972-05-12 1974-09-24 Nitro Nobel Ab Wire connector for two electric wires, which may possible be connected to electric detonators

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2649735A (en) * 1948-07-15 1953-08-25 Hercules Powder Co Ltd Lead wire for initiating devices
US2803695A (en) * 1951-05-03 1957-08-20 Amp Inc Closed end connector
US2862041A (en) * 1955-03-16 1958-11-25 Lektro Thermal Corp Splice for electrical wiring
US3226471A (en) * 1962-08-10 1965-12-28 Stephen N Buchanan Insulated splicer cap
US3585275A (en) * 1970-02-19 1971-06-15 George W Gillemot Kit and method for encapsulating conductor splice connections
US3838206A (en) * 1972-05-12 1974-09-24 Nitro Nobel Ab Wire connector for two electric wires, which may possible be connected to electric detonators

Also Published As

Publication number Publication date
BE420380A (xx)

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