US3283716A - Electric detonator - Google Patents

Electric detonator Download PDF

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Publication number
US3283716A
US3283716A US328689A US32868963A US3283716A US 3283716 A US3283716 A US 3283716A US 328689 A US328689 A US 328689A US 32868963 A US32868963 A US 32868963A US 3283716 A US3283716 A US 3283716A
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US
United States
Prior art keywords
insulating body
wall
conical
face
bore
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US328689A
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English (en)
Inventor
Horst A G Pasternack
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wasag Chemie AG
Original Assignee
Wasag Chemie AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wasag Chemie AG filed Critical Wasag Chemie AG
Application granted granted Critical
Publication of US3283716A publication Critical patent/US3283716A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C19/00—Details of fuzes
    • F42C19/08—Primers; Detonators
    • F42C19/12—Primers; Detonators electric
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/10—Initiators therefor
    • F42B3/12—Bridge initiators
    • F42B3/124—Bridge initiators characterised by the configuration or material of the bridge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/10—Initiators therefor
    • F42B3/12—Bridge initiators
    • F42B3/125—Bridge initiators characterised by the configuration of the bridge initiator case

Definitions

  • the present invention relates to an electric igniting element or detonator with an inner electrode and an outer electrode which surrounds an insulating body and has a contact part arranged at one of its edges, said contact part engaging a metalized surface at one end face of said insulating body. It is at the contact point between the contact part and the metalized surface which latter is in contact with the inner electrode, that the igniting spark for igniting or detonating the initiating explosive charge will occur.
  • the invention furthermore concerns a method of varying the electric resistance of detonators of the above mentioned type when making the same.
  • the contact part is designed in the form of a plate-shaped tongue of a marginal portion of the outer electrode, which portion is folded over to the edge of the end face of the insulating body.
  • This plate-shaped tongue or tip preferably rests against a conical or pyramid-shaped surface of one end face of the insulating body, which conical or pyramid-shaped surface tapers along a straight, concave or convex line.
  • An electric igniting element or detonator furthermore, has to meet the requirement that the initiating or detonating explosive charge will be pressed at high pressure against the corresponding parts of the outer electrode and against the insulating body.
  • FIG. 1 represents a vertical section through a detonator according to the present invention.
  • FIG. 2 is a section taken along the line IIII of FIG. 1.
  • FIG. 3 is a top view of the detonator of FIG. 1.
  • FIGS. 4 and 5 illustrate on a somewhat larger scale than FIG. 1 certain details thereof.
  • the electric detonator according to the present invention is characterized primarily in that the outer electrode together with a cylindrical margial portion thereof forms a gable-shaped depression the tip of which rests against a metalized surface of one end face of the insulating body.
  • the design of the insulating body, of the partially metalized end surface, and of the metalized inner bore for receiving the tubular inner electrode may be of any standard type.
  • the cylindrical marginal portion of the outer electrode should, at least at the gable-shaped depression, be free from burrs or the like.
  • the metalized end face of the insulating body may in a manner known per se be provided with a conical or pyramid-shaped extension against which the tip of the gable-shaped depression will rest.
  • the resistance of the igniting element in addition to depending on the specific resistance of the material being employed also depends on the cross section and the length of the conductor, the resistance of the igniting element or detonator may be varied by pressing the insulating body at a higher or lower pressure in longitudinal direction into the outer electrode.
  • the tip will slide along the conical or pyramid-shaped end face of the insulating body without sacrificing the point contact of the depression with the metalized surface while the effective length of the metalized surface serving as conductor will be increased.
  • the tip of the depression When employing a low pressure, the tip of the depression will remain closer to the pyramid-shaped or conical tip of the end face of the insulating body whereby the conducting path or effective length of the metalized surface will be shorter and the resistance will be lower.
  • the insulating body 1 made of any suitable insulating material as for instance a ceramic material has a central longitudinal bore 2 the wall of which is covered by a metallic layer S, for instance a layer of a silver alloy, said layer extending along the entire length of bore 2 and over the conical extension 4 at one end portion (in the drawing the upper portion) of the insulating body up to the circular foot line 5 of conical extension 4.
  • a sleeve 6 engages the metalized wall of said bore 2 and forms the inner electrode.
  • This inner electrode may be made for instance of an aluminium-steel alloy.
  • the shape of said inner electrode 6 is such that it follows the contour of the bore 2 including the tapering portion thereof.
  • the insulating body 1 has been pressed in the direction of the arrow P into a cylindrical metal sleeve 7 which forms the outer electrode.
  • This outer electrode may be made for instance of an alutmimlm-steel alloy.
  • the said insulating body is covered at the bottom end face by a layer 8 of an adhesive for metals which forms an adhesive layer and enters between the insulating body 1 and inner electrode 6 and also between the insulating body 1 and the outer elect-rode 7 thereby additionally holding these members in their respective position.
  • the outer electrode 7 comprises a cylindrical section 9 having a wall protruding longitudinally beyond the conical portion of the insulatin g body 1.
  • the marginal edge 9a of the outer electrode 7 is free from burrs and the like. A portion of this wall is depressed longitudinally and extends inwardly toward the center and is shaped so as to have the form of an inwardly directed gable-like depression V-shape, in cross section, the tip 11 of which has point contact with the metalized surface S of the conical portion 4 of the insulating body 1.
  • the two leg on walls 12, 13 of said gable-like depression impart upon the latter a high mechanical strength so that it will be possible not only to press the insulating body 1 in the direction of the arrow P at a more or less high pressure into the outer electrode 7 without affecting the point contact .at point 11, but also to press the initiating explosive charge in the direction of the arrow Z at a high pressure against the igniting element without causing any material deformation of the depression acting as contact part.
  • the metal layer S as illustrated in FIG. 4 may, at the upper edge R of cone 4 and in the immediate vicinity thereof, form a layer section s which is somewhat thicker than at the foot line 5 of the cone or at the wall of bore 2.
  • the layer S at the inclined section A of the cone will be given a uniform thickness.
  • the tip 10a of the depression can relatively slide along the said section A whereby the distance from said tip to the contact of the inner electrode 6 with the layer S will be increased or decreased depending on the relative downward or upward movement of tip 10a with regard to the inclined section A. It is thus possible also to increase the resistance when tip 10a moves into the position 10a indicated by dash lines.
  • the depressed edge or gable portion K fronts a line along the apex and may extend inwardly at any angle relative to a plane transverse of the outer electrode, as much as 30 on either side of the plane.
  • the design of the contact part as gable-shaped depression will produce a high mechanical strength at reduced cost of manufacture.
  • the increased mechanical strength makes it possible to press the initiating explosive charge at high pressure against the contact part without deflecting or distorting the contact part and therefore without sacrificing the point contact between the contact part and the metalized portion of the end face surface of the insulating body.
  • the detonator will be made safe against premature or delayed action.
  • An electric igniting element for use in a detonator which includes: an insulating body having two end faces and having a bore therethrough extending from one end face to the other end face of said insulating body, one of said end faces having a conical portion surrounding said bore, a metallic layer on the wall of said bore and on said conical portion, an inner electrode firmly located in said bore and in contact with said metallic layer, and an outer tubular electrode firmly surrounding and engaging said insulating body and having its wall protruding longitudinally from said insulating body beyond said conical face portion, said protruding portion of said wall being depressed inwardly and longitudinally at one point to form a depressed portion V-shape in cross section having the line of the apex extending inwardly from the wall of said tubular electrode to-a point in contact with said conical portion, the walls of said V-shape portion extending from said line of the apex outwardly and longitudinally to the tubular wall and the inward ends of said walls joining the

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Spark Plugs (AREA)
  • Air Bags (AREA)
US328689A 1962-12-12 1963-12-06 Electric detonator Expired - Lifetime US3283716A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEW33502A DE1179847B (de) 1962-12-12 1962-12-12 Elektrisches Zuendelement

Publications (1)

Publication Number Publication Date
US3283716A true US3283716A (en) 1966-11-08

Family

ID=7600351

Family Applications (1)

Application Number Title Priority Date Filing Date
US328689A Expired - Lifetime US3283716A (en) 1962-12-12 1963-12-06 Electric detonator

Country Status (8)

Country Link
US (1) US3283716A (forum.php)
AT (1) AT256681B (forum.php)
BE (1) BE640717A (forum.php)
CH (1) CH406013A (forum.php)
DE (1) DE1179847B (forum.php)
FR (1) FR1375544A (forum.php)
GB (1) GB1035059A (forum.php)
SE (1) SE309378B (forum.php)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1200171B (de) * 1964-03-12 1965-09-02 Rheinmetall Gmbh Elektrische Zuendschraube
EP0120176B1 (de) * 1983-02-22 1987-11-19 Ems-Inventa AG Elektrischer Polkörper

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1021774B (de) * 1956-04-23 1957-12-27 Wasagchemie Ag Elektrisches Zuendelement
FR1153445A (fr) * 1955-03-23 1958-03-10 Wasagchemie Ag Fusée électrique et procédé pour sa fabrication
US2974591A (en) * 1957-04-04 1961-03-14 Wasag Chemie Ag Fa Electric fuses for detonators and the like
US2986090A (en) * 1954-08-23 1961-05-30 Ernst H Doerpinghaus Electric fuses for igniting explosive charges

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE566217A (forum.php) 1957-04-04

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2986090A (en) * 1954-08-23 1961-05-30 Ernst H Doerpinghaus Electric fuses for igniting explosive charges
FR1153445A (fr) * 1955-03-23 1958-03-10 Wasagchemie Ag Fusée électrique et procédé pour sa fabrication
DE1021774B (de) * 1956-04-23 1957-12-27 Wasagchemie Ag Elektrisches Zuendelement
US2974591A (en) * 1957-04-04 1961-03-14 Wasag Chemie Ag Fa Electric fuses for detonators and the like

Also Published As

Publication number Publication date
GB1035059A (en) 1966-07-06
SE309378B (forum.php) 1969-03-17
FR1375544A (fr) 1964-10-16
DE1179847B (de) 1964-10-15
BE640717A (forum.php) 1964-04-07
CH406013A (de) 1966-01-15
AT256681B (de) 1967-09-11

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