GB739929A - Delay electric blasting caps - Google Patents
Delay electric blasting capsInfo
- Publication number
- GB739929A GB739929A GB3002/54A GB300254A GB739929A GB 739929 A GB739929 A GB 739929A GB 3002/54 A GB3002/54 A GB 3002/54A GB 300254 A GB300254 A GB 300254A GB 739929 A GB739929 A GB 739929A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- lead
- composition
- spiral
- charge
- 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
Links
- 238000005422 blasting Methods 0.000 title abstract 3
- 239000000203 mixture Substances 0.000 abstract 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- 229910052802 copper Inorganic materials 0.000 abstract 2
- 239000010949 copper Substances 0.000 abstract 2
- 229910052751 metal Inorganic materials 0.000 abstract 2
- 239000002184 metal Substances 0.000 abstract 2
- 229910052710 silicon Inorganic materials 0.000 abstract 2
- 239000010703 silicon Substances 0.000 abstract 2
- 239000007787 solid Substances 0.000 abstract 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 abstract 1
- AGUIVNYEYSCPNI-UHFFFAOYSA-N N-methyl-N-picrylnitramine Chemical group [O-][N+](=O)N(C)C1=C([N+]([O-])=O)C=C([N+]([O-])=O)C=C1[N+]([O-])=O AGUIVNYEYSCPNI-UHFFFAOYSA-N 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 abstract 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract 1
- 239000005864 Sulphur Substances 0.000 abstract 1
- 239000004411 aluminium Substances 0.000 abstract 1
- 229910052782 aluminium Inorganic materials 0.000 abstract 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract 1
- 229910052787 antimony Inorganic materials 0.000 abstract 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 abstract 1
- 239000010426 asphalt Substances 0.000 abstract 1
- 229910052796 boron Inorganic materials 0.000 abstract 1
- 239000011810 insulating material Substances 0.000 abstract 1
- ISEQAARZRCDNJH-UHFFFAOYSA-N lead(ii) azide Chemical compound [N-]=[N+]=N[Pb]N=[N+]=[N-] ISEQAARZRCDNJH-UHFFFAOYSA-N 0.000 abstract 1
- 239000012286 potassium permanganate Substances 0.000 abstract 1
- 230000037452 priming Effects 0.000 abstract 1
- 238000007789 sealing Methods 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 239000010959 steel Substances 0.000 abstract 1
- 238000004804 winding Methods 0.000 abstract 1
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
- F42B3/16—Pyrotechnic delay initiators
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Fuses (AREA)
- Air Bags (AREA)
Abstract
739,929. Blasting fuzes. CANADIAN INDUSTRIES (1954), Ltd. Feb. 2, 1954 [Feb. 28, 1953], No. 3002/54. Classes 9(1) and 9(2). An electric blasting device is provided with a delay element placed between the igniter and the detonating charge, the element being a metallic cylinder 4 containing a fuze composition 5 arranged in a spiral. Fig. 1 shows a metal shell 1 of copper or aluminium, into which is introduced a base charge 2 and a priming charge 3 such as a lead azide-lead styphnate mixture. The delay cylinder 4 is of lead and above it is a matchhead 6 connecting lead wires 7, 8 which extend through a plug 9 of sulphur asphalt, rubber or other plastic insulating materials. The delay element may be made by drawing down a lead tube filled with the fuze composition, sealing the ends of the tube, then winding the tube on a mandrel with adjacent turns in contact. The mandrel is then removed and the helix cut to the required length and swaged in a die to produce the solid cylinder 4. The fuze composition may be 70 per cent red lead, 16 per cent silicon and 14 per cent silica. In a given example the swaged tube is wound around a piano wire to produce a helix of outer diameter 0À250 with 7 to 8 turns per inch. The wire being removed, the spiral is cut into 1À2 inch long sections which are placed in a steel die and pressed under a load of 600 pounds. A solid cylinder 0À92 inches long is thus produced and inserted in a copper shell containing a base charge of tetryl. The delay period can be altered by changing the length of the spiral or altering the fuze composition. An alternative composition given is 69 per cent potassium permanganate, 29À5 per cent antimony, 1À5 per cent boron. In place of the matchhead, a loose charge of igniting composition such as 70 parts red lead and 30 parts silicon may be used. The mandrel used to form the spiral may be of soft metal and allowed to remain within the delay element and be compressed with it.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA739929X | 1953-02-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB739929A true GB739929A (en) | 1955-11-02 |
Family
ID=4172322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3002/54A Expired GB739929A (en) | 1953-02-26 | 1954-02-02 | Delay electric blasting caps |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE940159C (en) |
| GB (1) | GB739929A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2477138A1 (en) * | 1980-03-01 | 1981-09-04 | Dynamit Nobel Ag | MIXTURE OF PYROTECHNIC COMPOSITION FOR ELEMENTS WITH DELAY AND APPLICATION OF THIS MIXTURE |
| US4729504A (en) * | 1985-06-01 | 1988-03-08 | Mizuo Edamura | Method of bonding ceramics and metal, or bonding similar ceramics among themselves; or bonding dissimilar ceramics |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE497998A (en) * | 1950-04-06 |
-
1954
- 1954-02-02 GB GB3002/54A patent/GB739929A/en not_active Expired
- 1954-02-20 DE DEC8916A patent/DE940159C/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2477138A1 (en) * | 1980-03-01 | 1981-09-04 | Dynamit Nobel Ag | MIXTURE OF PYROTECHNIC COMPOSITION FOR ELEMENTS WITH DELAY AND APPLICATION OF THIS MIXTURE |
| US4729504A (en) * | 1985-06-01 | 1988-03-08 | Mizuo Edamura | Method of bonding ceramics and metal, or bonding similar ceramics among themselves; or bonding dissimilar ceramics |
Also Published As
| Publication number | Publication date |
|---|---|
| DE940159C (en) | 1956-03-08 |
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