US1856642A - Fire-damp proof time fuse - Google Patents

Fire-damp proof time fuse Download PDF

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Publication number
US1856642A
US1856642A US485221A US48522130A US1856642A US 1856642 A US1856642 A US 1856642A US 485221 A US485221 A US 485221A US 48522130 A US48522130 A US 48522130A US 1856642 A US1856642 A US 1856642A
Authority
US
United States
Prior art keywords
fuse
shell
fire
gases
damp proof
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
US485221A
Other languages
English (en)
Inventor
Karollus Edmund
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US1856642A publication Critical patent/US1856642A/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
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/10—Initiators therefor
    • F42B3/11—Initiators therefor characterised by the material used, e.g. for initiator case or electric leads
    • 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
    • F42B3/16—Pyrotechnic delay initiators

Definitions

  • This invention relates to a time fuse consisting in the known manner of an electric glow fuse and a detonating cap.
  • a retardation or delay-action fuse contained in a special shell is inserted between the glow us'e,
  • .porous material (filters) of non-infiammable matter in the form of plugs or -illers are provided in the path where the gases areexpanded.
  • the filter materials must present only slight resistance to the advance- Y ment of the gases.
  • the filter materials must be so shaped and arranged that they cannot be compressed by the gas pressure to such an extent that they form an obstruction for the passage of thegases or close the perforations o the fuse.
  • the openings of the ⁇ fuse,thro ugh which the gases escape into the bore hole chamber, must be provided in such places of the fuse so that they cannot be covered externally.
  • Figure 1 shows a longitudinal sectional view of the invention.
  • Figure 2 shows a longitudinal sectional view of a modification of Fig. 1, showing the ribs 11.
  • Figure 3 shows a cross sectional view thru the r1b section 11 of Fig. 2.
  • the shell 4 Figure 1) contains in its upper part the e ectrically ignitable composition 1, below which there is a plug 12 com- ⁇ posed of glass, slag, or asbestos wool and provided with a central bore 13 wherein a tube 14 is inserted which does not extend to the endsv of the bore.
  • a tube 14 is inserted which does not extend to the endsv of the bore.
  • the retarder 2 is surrounded by the shell 8 which has a ange 10.
  • the shell 4 is mounted on the shell 8.
  • the shell 8 is of such dimensions that a space is left betweenit and the shell 4.
  • the end of the shell 8 directed toward the detonating cap 3 is slightly conical-shaped so that the shell 7 of the detonating cap 3 --bears tightly on the said conical part of the shell 8 and the shell 8 cannot pass to thel composition of the cap.
  • the shell 8 has longitudinal ribs 11 so far as it is inserted in the shell 4.
  • the fuse operates as follows:
  • the excessive gases can immediately pass from the electric fuse 1, then above and below the tube 14 and from the retardation fuse 5 into the plug 12 without any obstruction; the gases are cooled therein and can freely pass to the chamber between shell 4 and shell 8 whence they issue past the edge 9 of the flange 10 into the bore hole chamber.
  • This part of the bore hole chamber is always uncovered and a free exit of the gases is therefore also possible. It is possible by this arrangement to prevent a bursting of the shell and the formation of a pointed flame.
  • the present invention it is possible to obtain a uniform, vfrictionless degassing free from a pointed flame in the space always remaining free between composition and charge so that the duration ofv combustion of a time fuse is maintained up to 116 part of a second and not only a premature eXplosion of the blasting charge' is avoided but also the security of the fire-damp is increased.
  • Fire-damp proof time-fuse with a filter layer preventing the formation of a pointed flame characterized in that the filter-plug made of non-inflammable fibrin in the known manner is arranged between the electrically ignitable composition and the retarder and is provided with an axial bore, into which a tube is inserted but which does not extend to the ends of the bore in order to lead the pointed flame from the glow-fuse to the retarder.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Connector Housings Or Holding Contact Members (AREA)
US485221A 1929-09-30 1930-09-29 Fire-damp proof time fuse Expired - Lifetime US1856642A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT356511X 1929-09-30

Publications (1)

Publication Number Publication Date
US1856642A true US1856642A (en) 1932-05-03

Family

ID=3672599

Family Applications (1)

Application Number Title Priority Date Filing Date
US485221A Expired - Lifetime US1856642A (en) 1929-09-30 1930-09-29 Fire-damp proof time fuse

Country Status (4)

Country Link
US (1) US1856642A (xx)
BE (1) BE373857A (xx)
FR (1) FR706882A (xx)
GB (1) GB356511A (xx)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2609752A (en) * 1946-07-12 1952-09-09 Atlas Powder Co Delay electric blasting cap
WO2003014652A1 (en) * 2001-08-06 2003-02-20 Austin Detonator Detonator with improved spacial location of its effects and efficient setting of initiation power
US20140013981A1 (en) * 2012-07-13 2014-01-16 Daicel Corporation Igniter assembly, method of assembling same and cover member

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2609752A (en) * 1946-07-12 1952-09-09 Atlas Powder Co Delay electric blasting cap
WO2003014652A1 (en) * 2001-08-06 2003-02-20 Austin Detonator Detonator with improved spacial location of its effects and efficient setting of initiation power
US20140013981A1 (en) * 2012-07-13 2014-01-16 Daicel Corporation Igniter assembly, method of assembling same and cover member
US9335133B2 (en) * 2012-07-13 2016-05-10 Daicel Corporation Igniter assembly, method of assembling same and cover member

Also Published As

Publication number Publication date
BE373857A (xx)
GB356511A (en) 1931-09-10
FR706882A (fr) 1931-06-30

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