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US3817181A Expired / Lapsed US ⏱️ 0.0 years remaining

Detonating cap

Assignee: Nitro Nobel AB
•
Filing: 1973-01-03
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Granted: 1974-06-18
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Expires: 1993-01-03
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Abstract

Abstract This invention relates to a detonating cap for an explosive charge and devised to be initiated from a fuse of the type consisting of a flexible tube the inner wall of which is coated with a thin layer of a powder of a reactive substance. The detonation cap of the invention has the form of a sleeve containing at least one charge and a delay element interposed between the charge and the end of the fuse introduced into an open end of the sleeve. The delay element has a central channel for open communication from the end of the fuse tube to the charge. In order to prevent said channel from being clogged by powder particles detached from the coating of the tube or the free surface of the charge from being covered by such detached particles opposite the said channel, this latter is bridged over by a shield of a structure adapted to deflect detached powder particles or the gas impact wave rushing out from the fuse tube. This shield may be shaped as a valve initially closing the channel but opening it when actuated by the gas impact valve.

Inventors

  • 👤 P Persson
  • 👤 G Lithner

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 00:18
CPC Classifications
F; F42; F42D; F42D1/00; F42D1/04

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 172 words
A detonating cap intended for use with a tubular fuse the inner wall of which is coated with powder of a reactive substance, such as an explosive, comprising a housing having a bore open at one end, a charge, a delay element, and a spacer element disposed one after the other in said bore with said spacer element facing the open end thereof, and guide means on said housing for guiding one end of a fuse from outside the housing and through the open end of the lastmentioned bore to an operative position in which the fuse confronts said spacer element, said spacer element providing at least one passage connecting said delay element with the open end of said bore and said fuse, when the latter is in its operative position, and a portion of said spacer element forming a shield extending part way across said passage and being of such structure as to effect a deflection of powder and a gas impact wave transferred from a fuse toward the delay element.
Claim 2
Dependent Claim 172 words
A detonating cap intended for use with a tubular fuse the inner wall of which is coated with powder of a reactive substance, such as an explosive, comprising a housing having a bore open at one end, a charge, a delay element, and a spacer element disposed one after the other in said bore with said spacer element facing the open end thereof, and guide means on said housing for guiding one end of a fuse from outside the housing and through the open end of the lastmentioned bore to an operative position in which the fuse confronts said spacer element, said spacer element providing at least one passage connecting said delay element with the open end of said bore and said fuse, when the latter is in its operative position, and a portion of said spacer element forming a shield extending part way across said passage and being of such structure as to effect a deflection of powder and a gas impact wave transferred from a fuse toward the delay element.
Claim 3
Dependent Claim 43 words
The detonating cap as claimed in claim 1, wherein said spacer element has two passages therethrough on opposite sides of said shield, whereby the shield is devised to be passed on both sides by powder and/or a gas impact wave from a fuse.
Claim 4
Dependent Claim 35 words
The detonating cap as claimed in claim 1, characterized in that said shield has at least one inclined surface facing the open end of said bore to confront a fuse disposed in its operative position.
Claim 5
Dependent Claim 42 words
The detonating cap as claimed in claim 3, characterized in that said shield projects from one side of the spacer element and transversely across an imagined prolongation of the bore in a fuse, when the latter is disposed in said operative position.
Claim 6
Dependent Claim 51 words
The detonating cap as claimed in claim 1, wherein said shield is disposed normally to shut off the passage between the bore in the fuse and the delay element, when the fuse is in its operative position, and disposed to be forced by said gas impact wave to open said passage.
Claim 7
Dependent Claim 40 words
The detonating cap as claimed in claim 5, characterized in that said spacer element is formed as a spring-actuated valve member for closing the bore in the confronting end of the fuse, when the latter is in its operative position.

References Cited (Backward Citations)

FR1219373A Cited
GB998607A Cited
US3106892A Cited
US3368485A Cited
US3590739A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-06-17 1977-12-17 1978-06-18 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-06-17 1981-12-17 1982-06-18 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-06-17 1985-12-17 1986-06-18 $7700.00 Window Closed / Lapsed

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