CA1316759C - Propagating device for low energy fuses - Google Patents
Propagating device for low energy fusesInfo
- Publication number
- CA1316759C CA1316759C CA000557762A CA557762A CA1316759C CA 1316759 C CA1316759 C CA 1316759C CA 000557762 A CA000557762 A CA 000557762A CA 557762 A CA557762 A CA 557762A CA 1316759 C CA1316759 C CA 1316759C
- Authority
- CA
- Canada
- Prior art keywords
- housing
- fuse
- connection means
- propagating
- length
- 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 - Fee Related
Links
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06C—DETONATING OR PRIMING DEVICES; FUSES; CHEMICAL LIGHTERS; PYROPHORIC COMPOSITIONS
- C06C5/00—Fuses, e.g. fuse cords
- C06C5/06—Fuse igniting means; Fuse connectors
-
- 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
- F42D1/043—Connectors for detonating cords and ignition tubes, e.g. Nonel tubes
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Fuses (AREA)
Abstract
ABSTRACT
"A Propagating Device for Low Energy Fuses"
The invention provides a delay device for use between the lengths of low energy detonating fuses. The device comprises a tubular housing having secured at each end a low energy detonating fuse. Within the housing is a centrally located, burning delay element on each side of which is a primary explosive propagating element. The delay device is used in non-electric delay blasting operations.
"A Propagating Device for Low Energy Fuses"
The invention provides a delay device for use between the lengths of low energy detonating fuses. The device comprises a tubular housing having secured at each end a low energy detonating fuse. Within the housing is a centrally located, burning delay element on each side of which is a primary explosive propagating element. The delay device is used in non-electric delay blasting operations.
Description
1 3 1 6 7 J 3 AE~I 595 THIS INVENTION relates to a propagating device, or relay, for low energy fuses.
According to the invention there is provided a propaga-ting device for low energy fuses which includes a housing;
a first connection means fast with the housing for connec-ting a first length of fuse to the housing so that the said first lèngth of fuse is in communication with the interior of the housing, a second connection means spaced from the first connection means, the second connection means being fast with the housing for connecting a second length of fuse to the housing so that the said second length of fuse is also in communication with the interior of the housing; and a propagating means located within the housing intermediate the first connection means and the second connection means, the propagating means being responsive to a shock wave passing into the housing from the first length of fuse for providing a propa-gating shock wave to the second length of fuse of sufficient intensity to activate the second length of fuse.
'~ ' 13167~9 The housing may comprise a substantially tubular member with the first connection means being provided at one end of the tubular member and the second connection means being provided at the other end.
The propagating means may comprise two propagating elements arranged in spaced relationship within the interior of the tubular member.
Each propagating element may comprise a short length of tubing con~aining an explosive or pyrotechnic composition. The explosive composition may comprise lead azide lead styphnate or a mixture of both.
The device may include a delay element arranged inter-mediate the two propagating elements. The delav element may comprise a pyrotechnic composition.
Each connection means may comprise a compo.ent definir,g a passage whereby co~munication with the interior o the housing is established. Conveniently the component may be a plug which i5 receivable in the end of the tubular member.
The passage may be closed off by a membran ~o seal the interior of tne housing hermetically.
Each connection means may include a spigo--like forma-tion which projects outwardly from the component the spigot-like 1 3 1 6 7 5 j1 formation being ~ngageable with an end of the assocldted length of fuse. It will be appreciated ~hat, in place of the spigot-like formation, a socket-like portion with which the lenath of fuse is engageable could be provided.
5The device may include a closure member for each spigot-like formation for closing off the free end of each spigot-like formation.
The connection means and the delay element may be retained in position in the housing by the housing being crimped about the connection means and the delay element.
It will be appreciated that with a propaca'ing device in accordance with the invention, a shock front may be propagated from one length of low energy fuse to another, in ei~her direc-tion, with or without a time delay.
15The invention is now described, by way of an example, with reference to the accompanying drawing, which snows a sec-tioned view of a propagating device in accordance wi,n the inven-tion.
Referring to the drawing, a propagating device, or 20relay, is designated generally by reference numeral 10. The device 10 has a tubular housing 12 that is of aluminium, copper or a suitable synthetic plastics material. Centrally located 131675'~
within the housing 12 is a time delay element 14 which is of a suitable pyrotechnic composition, such as Si/PbO . The housing 12 is crimped in the region of the time delay 14, as at 16, to retain the delay element 14 in position.
5At each end of the housing 12 there is d rubber plug 18 which defines a central passage 20, Ihe passage 20 being closed close to its inner end by means of a membrane 22. The plugs 18 are held in position by crimping of the housing 12, as shown at 24. Further, in the embodiment illustrated, a short length of tubing 26 which may have some explosive powder therein as is the case with low energy fuse, has one end secured withi.n the passage 20 of the plug 18 and has its other end project,ng a short -distance f rom the free end of the plug 18. The f ree end of each length of tubing 26 is closed by a cap 28. It will b- appreciated ~hat, instead of the length of tubing 26, the end ~f the length of fuse could be inserted into the passage 20 of ~he plug 18 directly.
Between the delay element 14 and the pllgs 18, and spaced from the delay element 14, there are two propagating elements 30, one on each side of the delay elemen~ 14. Each propagating element 30 constiiutes a short leng-~ of hollow aluminium 32 which is packed with a suitable propagating mater-ial, such as lead azide or lead styphnate 34.
In use, the caps 28 are removed and a fi~st length of low energy fuse (not shown) i5 engaged with one length of tubing 26 by means of a c~nnecting piece (also n~t shown) a.~d the other length of tubing 26 is engaged with the other length of fuse (also not shown) by a further connecting piece (that is also ..ot shown). Then, a shock wave provided by one of tne lengths of fuse will pass through its associated length of tubing 26, rup-ture the membrane 22 and activate the adjacent pro~agating ele-ment 30. This propagating element 30 will in turr; activate the delay element 14. After a period of time determine~ by the delay element 14 the other propagating element 30 will be activated and it in turn will rupture the membrane 22 adjacent thereto with the shock wave passing through the associated length of tubing 26 into the low energy fuse connected thereto, thereb~ initiating a shock wave in that length of low energy fuse.
It will be appreciated that more than o~e length oL
fuse can be connec~ed to each end of the propagati~.g device 10, by suitably branched connecting pie;es.
According to the invention there is provided a propaga-ting device for low energy fuses which includes a housing;
a first connection means fast with the housing for connec-ting a first length of fuse to the housing so that the said first lèngth of fuse is in communication with the interior of the housing, a second connection means spaced from the first connection means, the second connection means being fast with the housing for connecting a second length of fuse to the housing so that the said second length of fuse is also in communication with the interior of the housing; and a propagating means located within the housing intermediate the first connection means and the second connection means, the propagating means being responsive to a shock wave passing into the housing from the first length of fuse for providing a propa-gating shock wave to the second length of fuse of sufficient intensity to activate the second length of fuse.
'~ ' 13167~9 The housing may comprise a substantially tubular member with the first connection means being provided at one end of the tubular member and the second connection means being provided at the other end.
The propagating means may comprise two propagating elements arranged in spaced relationship within the interior of the tubular member.
Each propagating element may comprise a short length of tubing con~aining an explosive or pyrotechnic composition. The explosive composition may comprise lead azide lead styphnate or a mixture of both.
The device may include a delay element arranged inter-mediate the two propagating elements. The delav element may comprise a pyrotechnic composition.
Each connection means may comprise a compo.ent definir,g a passage whereby co~munication with the interior o the housing is established. Conveniently the component may be a plug which i5 receivable in the end of the tubular member.
The passage may be closed off by a membran ~o seal the interior of tne housing hermetically.
Each connection means may include a spigo--like forma-tion which projects outwardly from the component the spigot-like 1 3 1 6 7 5 j1 formation being ~ngageable with an end of the assocldted length of fuse. It will be appreciated ~hat, in place of the spigot-like formation, a socket-like portion with which the lenath of fuse is engageable could be provided.
5The device may include a closure member for each spigot-like formation for closing off the free end of each spigot-like formation.
The connection means and the delay element may be retained in position in the housing by the housing being crimped about the connection means and the delay element.
It will be appreciated that with a propaca'ing device in accordance with the invention, a shock front may be propagated from one length of low energy fuse to another, in ei~her direc-tion, with or without a time delay.
15The invention is now described, by way of an example, with reference to the accompanying drawing, which snows a sec-tioned view of a propagating device in accordance wi,n the inven-tion.
Referring to the drawing, a propagating device, or 20relay, is designated generally by reference numeral 10. The device 10 has a tubular housing 12 that is of aluminium, copper or a suitable synthetic plastics material. Centrally located 131675'~
within the housing 12 is a time delay element 14 which is of a suitable pyrotechnic composition, such as Si/PbO . The housing 12 is crimped in the region of the time delay 14, as at 16, to retain the delay element 14 in position.
5At each end of the housing 12 there is d rubber plug 18 which defines a central passage 20, Ihe passage 20 being closed close to its inner end by means of a membrane 22. The plugs 18 are held in position by crimping of the housing 12, as shown at 24. Further, in the embodiment illustrated, a short length of tubing 26 which may have some explosive powder therein as is the case with low energy fuse, has one end secured withi.n the passage 20 of the plug 18 and has its other end project,ng a short -distance f rom the free end of the plug 18. The f ree end of each length of tubing 26 is closed by a cap 28. It will b- appreciated ~hat, instead of the length of tubing 26, the end ~f the length of fuse could be inserted into the passage 20 of ~he plug 18 directly.
Between the delay element 14 and the pllgs 18, and spaced from the delay element 14, there are two propagating elements 30, one on each side of the delay elemen~ 14. Each propagating element 30 constiiutes a short leng-~ of hollow aluminium 32 which is packed with a suitable propagating mater-ial, such as lead azide or lead styphnate 34.
In use, the caps 28 are removed and a fi~st length of low energy fuse (not shown) i5 engaged with one length of tubing 26 by means of a c~nnecting piece (also n~t shown) a.~d the other length of tubing 26 is engaged with the other length of fuse (also not shown) by a further connecting piece (that is also ..ot shown). Then, a shock wave provided by one of tne lengths of fuse will pass through its associated length of tubing 26, rup-ture the membrane 22 and activate the adjacent pro~agating ele-ment 30. This propagating element 30 will in turr; activate the delay element 14. After a period of time determine~ by the delay element 14 the other propagating element 30 will be activated and it in turn will rupture the membrane 22 adjacent thereto with the shock wave passing through the associated length of tubing 26 into the low energy fuse connected thereto, thereb~ initiating a shock wave in that length of low energy fuse.
It will be appreciated that more than o~e length oL
fuse can be connec~ed to each end of the propagati~.g device 10, by suitably branched connecting pie;es.
Claims (13)
1. A propagating device for low energy fuses which includes a housing;
a first connection means fast with the housing for connecting a first length of fuse to the housing so that the said first length of fuse is in communication with the interior of the housing;
a second connection means spaced from the first connection means, the second connection means being fast with the housing for connecting a second length of fuse to the housing so that the said second length of fuse is also in communcation with the interior of the housing; and a propagating means located within the housing intermediate the first connection means and the second connection means, the propagating means being responsive to a shock wave passing into the housing from the first length of fuse for providing a propagating shock wave to the second length of fuse of sufficient intensity to activate the second length of fuse.
a first connection means fast with the housing for connecting a first length of fuse to the housing so that the said first length of fuse is in communication with the interior of the housing;
a second connection means spaced from the first connection means, the second connection means being fast with the housing for connecting a second length of fuse to the housing so that the said second length of fuse is also in communcation with the interior of the housing; and a propagating means located within the housing intermediate the first connection means and the second connection means, the propagating means being responsive to a shock wave passing into the housing from the first length of fuse for providing a propagating shock wave to the second length of fuse of sufficient intensity to activate the second length of fuse.
2. The device as claimed in Claim 1 in which the housing comprises a substantially tubular member with the first connection means being provided at one end of the tubular member and the second connection means being provided at the other end.
3. The device as claimed in Claim 2 in which the propagating means comprises two propagating elements arranged in spaced relationship within the interior of the tubular member.
4. The device as claimed in Claim 3 in which each propagating element comprises a short length of tubing containing an explosive or pyrotechnic composition.
5. The device as claimed in Claim 4 in which the explosive composition comprises lead azide, lead styphnate or a mixture of both.
6. The device as claimed in any one of Claims 3 to 5 inclusive which includes a delay element arranged intermediate the two propagating elements.
7. The device as claimed in Claim 6 in which the delay element comprises a pyrotechnic composition.
8. The device as claimed in any one of Claims 1 to 5 in which each connection means comprises a component defining a passage whereby communication with the interior of the housing is established.
9. The device as claimed in Claim 8 in which the passage is closed off by a membrane to seal the interior of the housing hermetically.
10. The device as claimed in Claim 8 in which each connection means includes a spigot-like formation which projects outwardly from the component, the spigot-like formation being engageable with an end of the associated length of fuse.
11. The device as claimed in Claim 10 which includes a closure member for each spigot-like formation for closing off the free end of each spigot-like formation.
12. The device as claimed in Claim 6 in which the connection means and the delay element are retained in position in the housing by the housing being crimped about the connection means and the delay element.
13. A blasting system which includes a plurality of lengths of low energy fuse with adjacent lengths of low energy fuse being interconnected by means of a propagating device as claimed in Claim 1.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA87995 | 1987-02-11 | ||
| ZA87/0995 | 1987-02-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1316759C true CA1316759C (en) | 1993-04-27 |
Family
ID=25578763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000557762A Expired - Fee Related CA1316759C (en) | 1987-02-11 | 1988-01-29 | Propagating device for low energy fuses |
Country Status (6)
| Country | Link |
|---|---|
| AU (1) | AU599199B2 (en) |
| CA (1) | CA1316759C (en) |
| GB (1) | GB2200977B (en) |
| IE (1) | IE880267L (en) |
| NZ (1) | NZ223367A (en) |
| ZW (1) | ZW788A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2280529A (en) * | 1993-07-26 | 1995-02-01 | Autoliv Dev | Vehicle safety arrangement. |
| US5413046A (en) * | 1994-03-11 | 1995-05-09 | The Ensign-Bickford Company | Shock tube assembly |
| AUPP021697A0 (en) | 1997-11-06 | 1997-11-27 | Rocktek Limited | Radio detonation system |
| ZA200703938B (en) * | 2007-05-16 | 2009-07-29 | Beijing Auxin Chemical Technol | Three-way connector block |
| CN105605998A (en) * | 2016-01-18 | 2016-05-25 | 中国科学技术大学 | Explosion diode |
| AU2020216554A1 (en) | 2019-01-28 | 2021-06-24 | Detnet South Africa (Pty) Ltd | Detonator construction |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB815533A (en) * | 1956-11-05 | 1959-06-24 | Du Pont | Improvements in or relating to connectors for explosive cord |
| GB855749A (en) * | 1958-12-08 | 1960-12-07 | Ici Ltd | Improvements in reversible delay connectors |
| FR1310549A (en) * | 1961-09-11 | 1962-11-30 | Davey Bickford Smith & Cie Sa | Detonation delay relay for detonating cord |
| DE1153307B (en) * | 1961-09-22 | 1963-08-22 | Dynamit Nobel Ag | Detonating cord connector |
| AU522900B2 (en) * | 1978-03-17 | 1982-07-01 | Ici Australia Limited | A fuse device |
| FR2470757A1 (en) * | 1979-12-07 | 1981-06-12 | Aerospatiale | PYROTECHNIC CONNECTION WITH SEALED AND SELF-RELEASABLE PARTS |
| US4350097A (en) * | 1980-05-19 | 1982-09-21 | Atlas Powder Company | Nonelectric delay detonator with tubular connecting arrangement |
| US4424747A (en) * | 1981-04-27 | 1984-01-10 | E. I. Du Pont De Nemours And Company | Non-electric blasting assembly |
| NZ208080A (en) * | 1983-05-20 | 1986-10-08 | Ici Australia Ltd | Connector between detonating cord and low energy impulse propagating tubing |
| US4664033A (en) * | 1985-03-22 | 1987-05-12 | Explosive Technology, Inc. | Pyrotechnic/explosive initiator |
| DE3662727D1 (en) * | 1985-06-28 | 1989-05-11 | Aeci Ltd | Interconnecting low energy fuses |
-
1988
- 1988-01-18 ZW ZW7/88A patent/ZW788A1/en unknown
- 1988-01-28 GB GB8801934A patent/GB2200977B/en not_active Expired - Fee Related
- 1988-01-28 AU AU10946/88A patent/AU599199B2/en not_active Ceased
- 1988-01-29 CA CA000557762A patent/CA1316759C/en not_active Expired - Fee Related
- 1988-01-29 NZ NZ223367A patent/NZ223367A/en unknown
- 1988-02-01 IE IE880267A patent/IE880267L/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| GB8801934D0 (en) | 1988-02-24 |
| GB2200977A (en) | 1988-08-17 |
| AU599199B2 (en) | 1990-07-12 |
| ZW788A1 (en) | 1988-08-31 |
| AU1094688A (en) | 1988-08-18 |
| GB2200977B (en) | 1990-02-28 |
| NZ223367A (en) | 1989-10-27 |
| IE880267L (en) | 1988-08-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |