AU601786B2 - Interconnection of low energy fuses - Google Patents
Interconnection of low energy fuses Download PDFInfo
- Publication number
- AU601786B2 AU601786B2 AU82180/87A AU8218087A AU601786B2 AU 601786 B2 AU601786 B2 AU 601786B2 AU 82180/87 A AU82180/87 A AU 82180/87A AU 8218087 A AU8218087 A AU 8218087A AU 601786 B2 AU601786 B2 AU 601786B2
- Authority
- AU
- Australia
- Prior art keywords
- fuse
- tubular member
- length
- low energy
- connector
- 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.)
- Ceased
Links
- 238000003780 insertion Methods 0.000 claims description 27
- 230000037431 insertion Effects 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 13
- 238000005422 blasting Methods 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 230000035939 shock Effects 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 229920003051 synthetic elastomer Polymers 0.000 claims description 3
- 239000005061 synthetic rubber Substances 0.000 claims description 3
- 244000043261 Hevea brasiliensis Species 0.000 claims description 2
- 229920003052 natural elastomer Polymers 0.000 claims description 2
- 229920001194 natural rubber Polymers 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 241001482237 Pica Species 0.000 description 1
- 241000656145 Thyrsites atun Species 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
Landscapes
- Fuses (AREA)
Description
I
AECI 591 P/00/011 _1 7 Form PATENTS ACT 1952-1973 COMPLETE SPECIFICATION
(ORIGINAL)
FOR OFFICE USE Class: Int. CI: Application Number: Lodged: Complete Specification-Lodged: Accepted: Published: Priority: 'Related Art: This docufl -,nt conl aI1li' arn:~n~ft 7-77-1n cdifl e49 and is CUfecAt I 0 TO BE COMPLETED BY APPLICANT Name of Applicant: Address .ofApplicant: Actual Inventor: AECI LIMITED 16th Floor, Office Tower Carlton Centre Commissioner Street Johannesburg, Transvaal REPUBLIC OF SOUTH AFRICA
W
Jean Luc CURUTCHET Clive Frank WILKINS Graham PIKE Address for Service: Industrial Property Section ICI Australia Operations Proprietary Limited 1 Nicholson Street GPO Box .4311, felboun 01 Complete Specification for the invention entit l:oi 01 "INTERCONNECTION OF LOW ENERGY FUSES" Thei following statement is a fuil description ui this invention, including the best method of performing it known to me:- 'Note: The description is to be typed in double spacing, pica type face, in an area not exceeding 250 mm in depth and 160 mm in width, on tough white paper of good quality and it is to be inserted inside this form.
1 1710/76-L C, J1. tiiompsosl. Commonwealth Government Printer, Canberra k& 14
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2 THIS INVENTION relates to the interconnection of low energy fuses.
Low energy fuse, such as that known by the registered K* trade mark "Nonel" comprises a length of plastics tubing with A, an explosive coating therein.
r ce According to one aspect of the invention there is provided a method of connecting two lengths of low energy fuse which includes inserting one end of one length of fuse into one end of a short tubular member and inserting one -nd of the other length of fuse into the other end of the tubular member wherein the method is characterised in that the propagation of a low energy shock wave between the two lengths
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of low energy fuse i5 substantially unimpeded.
The applicant has found that, quite unexpectedly, if the tubular member is a centimetre or two in length, a shock wave is propagated through it.
If one end of the tubular member is closed then it may constitute a terminating component for terminating component for terminating a length of fuse.
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Cr 'It If one end of the tubular member is closed then it may constitute a terminating component for terminating a length of fuse.
Th'e method may include fitting the end of each length of fuse to the associated end of the tubular member by inserting the end of the length of fuse into the end of the tubular member.
The tubular member may comprise a tube of a resiliently flexible material having an inner diameter smaller than the outer diameter of the length of fuse, and the method may include enlarging each end of the tube prior to inserting the end of the length of fuse therein, and allowing the end of the tube to contract after insertion of the end of the length of fuse, thereby causing the end of the tube securely to grip the end of the length of fuse.
Instead, the tubular member may comprise a tube of a resiliently flexible material, and the method may include rolling the end of the tube back, inserting the end of the length of fuse into the rolled back end of the tube, and unrolling the end of the tube over the length of the fuse, securely to grip the end of the length of fuse.
According to another aspect of the invention, there is provided a connector for interconnecting two lengths of low energy fuse which includes a tubular member having a first end to which an end of a first length of fuse can be fitted, and a second end to which an end of a second length of fuse can be fitted, so that the interior of the tubular member is in c6mmunication with the interior of each length of fuse.
i, W 1 ti; -4- The tubular member may comprise a tube of a resiliently flexible naterial having a length of less than approximately two centimetres, and an inner diameter which is less than the outer diameter of the length of fuse.
Ir The ends of the tubular member may be chamfered to facilii tate insertion of the ends of the lengths of fuse into the ends of the tubular member. The ends of the tubular member may be chamfered at an 0 0 angle of between approximately 20 to 40 to a longitudinal axis of "7 the tubular member. Preferably, the ends of the tubular member may be o angled at about 30 to the longitudinal axis of the tubular member.
Si- It has been found that by chamfering the ends of the tubular member, the insertion of the ends of the lengths of fuse into the 7 member is facilitated.
The member may also be closed at one end to have only one open end which may then be used to plug or terminate a length of fuse.
The tubular member may be a short tube having opposed ends, or it may be branched having three or more ends.
The tubular member may be of a plastics material, such as PVC, a synthetic rubber material or a natural rubber material.
The invention extends still further to an insertion facilitating means for use with the connector as described above, the inseri~ii f-I 82 180/87 tion facilitating means including a tubular spreading element having a suitably thin wall, and an external diameter greater than the internal diameter of the tubular member of the connector so that on insertion of the spreading element into an end of the tubular member, the end of the tubular member is enlarged to facilitate insertion of the end of the length of fuse therein, the spreading element being shaped to 000o 0 0 0o00 1Facilitate its removal from the tubular member, in use.
0 00 0 t Xoo; It will be appreciated that the inner diameter of the sprea- 0. ding element is greater than the outer diameter of the length of fuse.
£0 'o c c The spreading element may have a tapered first end for facilitating its insertion into the tubular member, and a gripping formation at its opposed end for enabling it to be gripped to be removed from the tubular member. The gripping formation may comprise a radially outwardly extending flange arranged about the periphery of
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C' c the said opposed end.
At least the outer surface of the spreading element may be coated with a non-stick agent.
The invention extends also to a connector kit for interconnecting two lengths of low energy fuse, the kit comprising the combination of at least one connector as described above, with at least one insertion facilitating means as described above.
The invention extends further to a blasting system which includes a plurality of lengths of low energy fuse which have been connected together by means of a connector as described above, or in accordance with the method as described above.
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Y.p~ I; __ii-l n C C -6- The invention is now described, by way of example with reference to the accompanying diagranmatic drawings.
In the drawings: Figure 1 shows a sectional side view of. a connector in accordance with the invention for interconnecting two lengths of low energy fuse; Figure 2 shows a sectional side view of another embodiment of a connector in accordance with the invention used as a terminating or plugging member; Figure 3 shows a sectional side view of the connector of Figure 1 with insertion facilitating means inserted therein; Figure 4 shows a sectional side view of a further embodiment of a -connector in accordance with the invention for interconnecting two lengths of low energy fuse; and 'Figures 5 and 6 show sectional side views of yet another embodiment of a connector in accordance with the invention for interconnecting two lengths of low energy fuse.
Referring to figures 1 and 2 of the drawings, a connector is designated generally by the reference numeral 10. The connector 10 is used for connecting two lengths of low energy Nonel fuse 12 and 14.
The connector 10 comprises a short tubular member 16 having a length of between approximately I and 2 centimetres.
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-7- The tubular member 16 is made from a suitable plastics material such as PVC, or a nat-Jral or synthetic rubber material. The tubular member 16 has an internal diameter which is nominally smaller than the external diameter of the fuse 12, 14 with which it is to be used so that the tubular member 16 is a tight fit on the fuse.
Referring to Figure 2 of the drawings another embodiment of a connector is shown designated generally by the reference numeral In this embodiment, the connector 20 comprises a tubular member 22 having one end 24 closed off to serve as a plug or a terminating member for a length of fuse 26.
In use, two lengths of low energy fuse 12 and 14 are connected together by inserting the length of fuse 12 into one end of the tubular member 16 and the length of fuse 14 into the other end of the tubular member 16. With a tubular member 16 having a length of approximately 1 or 2 centimetres, it has been found that a shock wave propagating through the length of fuse 12 will be propagated through *the tubular member 16 into the length of fuse 14.
To facilitate insertion of the lengths of fuse 12 and 14 into the tubular member 16, an insertion facilitating means 28 may be provided as shown in Figure 3. Each insertion facilitating means 28 serves to keep the ends of the tubular member 16 in an enlarged configuration, and may then be removed to allow the ends of the tubular member 16 to contract or shrink onto the lengths of fuse 12 and 14. Hence, the insertion facilitation means 28 comprises a spreading tubular element 30 having a suitably thin wall and an internal
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i re diameter larger than the outer diameter of the fuse 12,14. The spreading element 30 of each insertion facilitating means 28 is shaped to facilitate removal thereof from the tubular member 16. Instead, or in addition thereto, an outer surface of each spreading element 30 may have a coating of a non-stick agent to facilitate its removal from the tubular member 16. Each spreading element 30 is tapered to define an enlarged mouth 32 to facilitate insertion of an end of fuse 12,14.
A gripping fonrmation in the form of an outwardly extending flange 34 surrounds the mouth 32 whereby the insertion facilitating means 28 can be gripped to be removed from the tubular member 16.
Referring to Figure 4 of the drawings, a further embodiment of a connector in accordance with the invention is shown. With reference to Figure 1, like reference numerals refer to like parts unless otherwise specified.
In this embodiment of the invention, the ends of the tubular o member 16 are chamfered at an angle of about 30 to a longitudinal axis of the tubular member 16. It is then easier to insert the ends of the lengths' of fuse 12 and 14 into the tubular member 16.
Referring to Figures 5 and 6 of the drawings, yet another embodiment of a connector in accordance with the invention is shown.
Once again, with reference to Figure i, like reference numerals refer to like parts, unless otherwise specified.
±iJ -9- In this embodiment of the invention the ends 16.1 and 16.2 of the tubular member 16 are rolled back prior to insertion of the lengths of fuse 12 and 14 into the tubular member 16, as shown in Figure 5. Once the lengths of fuse 12 and 14 have been inserted, the ends 16.1 and 16.2 are unrolled, as shown in Figure 6, thereby securely gripping the lengths of fuse 12 and 14.
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Claims (22)
1. A method of interconnecting two lengths of low energy fuse which includes providing a tubular member; fitting one end of one length of low energy fuse to a first end of the tubular member; and fitting one end of the other length of low energy fuse to the other end of the tubular member so that the interior of the tubular member is in communication with the interior of each length of low energy fuse; wherein the method is characterised in that the propagation of a low energy shock waver between the two lengths of low energy fuse is substantially unimpeded.
2. A method as claimed in Claim 1 which includes fitting the end of each length of low energy fuse to the associated end of the tubular member by inserting the end of the length of low energy fuse into the end of the tubular member.
3. A method as claimed in Claim 2 in which the tubular member comprises a tube of a resiliently flexible material having an inner diameter smaller that the outer diameter of the length of low energy fuse, and in which the method includes enlarging each end of the tube prior to inserting the end of the length of low energy fuse therein, and allowing the end of the tube to contract after insertion of the end of the length of low energy fuse, thereby allowing the end of the tube to grip the end of the length of low energy fuse securely. I .r;-ix,.wi l r rTllilCY~119S;I~ 11
4. A method as claimed in Claim 2 in which the tubular member comprises a tube of a resiliently flexible material, and in which the method includes rolling the end of the tube back, inserting the end of the length of fuse into the rolled back end of the tube, and unrolling the end of the tube over the length of the fuse, securely to grip the end of the length of fuse.
A new method of interconnecting two lengths of low energy fuse substantially as described and as illustrated herein.
6. A connectorjfor interconnecting two lengths of low energy fuse as hereinbefore defined which includes a tubular member having a first end to which and end of a first length of fuse can be fitted, and a second end to which an end of a second length of fuse can be fitted, so that the interior of the tubular member is in communication with the interior of each length of fuse and wherein the ends of the tubular member are chamfered to facilitate insertion of the ends of the lengths of fuse into the ends of the tubular member; the connector characterised in that the passage of the low energy shockwave between the first length of low energy fuse and the second lengths of low energy fuse is substantially unimpeded.
7. A connector as claim in Claim 6 in which the tubular member comprises a tube of a resiliently flexible material having a length of less than approximately two centimetres, and an inner diameter which is less than the outer diameter of the length of fuse. rrt~ C r i-at' -I ii_ i 11a
8. A connector as claimed in Claim 6 in which the ends of the tubular member are chamfered at an angle of between approximately 20' to 40" to a longitudinal axis of the tubular member. 1 1 v g I B 1 E e ,I j $I 'B o o D i, p i B 12
9. A connector as claimed in any one of the Claims 6 to 8 inclusive in which the tubular member is of a plastics material, or a synthetic rubber material or a natural rubber material.
A connector as claimed in any one of Claims 6 to 9 inclusive in which one end of the tubular member is closed off to constitute a plugging or terminating component for a length of fuse.
11. A new connector for interconnecting two lengths of low energy fuse, substantially as described and as illustrated herein.
12. An insertion facilitating means for use with the connector of any one of Claims 6 to 11 inclusive, the insertion facilitating means including a tubular spreading element having a suitably thin wall, and an external diameter greater than the internal diameter of the tubular member of the connector so that on insertion of the spreading element into an end of the tubular member, the end of the tubular member is enlarged to facilitate insertion of the end of the length of fuse therein, the spreading element being shaped to facilitate its removal from the tubular member, in use.
13. An insertion facilitating means as claimed in claiml2 in which the spreading element has a tapered first end for facilitating its insertion into the tubular member, and a gripping formation at its opposed end for enabling it to be gripped to be removed from the tubular member. 1 i 27 13 An
14. TIeinsertion facilitating means as claimed in Claim 13 in which the gripping formation comprises a radially outwardly extending flange arranged about the periphery of the said opposed end.
An\ feAinsertion facilitating means as claimed in any one of Claims 12 to 14 inclusive in which at least the outer surface of the spreading element is coated with a non-stick agent.
16. A new insertion facilitating means substantially as described and as illustrated herein.
17. A connector kit for interconnecting two lengths of low energy fuse, the kit comprising the combination of at least )ne connector as claimed in any one of Claims 6 to 11 inclusive, with at least one insertion facilitating means as claimed in any one of Claims 12 to 16 inclusive.
18. A new connector kit substantially as described and as illustrated herein.
19. A blasting system which includes a plurality of lengths of low energy fuse which have been connected together by means of a connector as claimed in any one of Claims 6 to 11 inclusive.
20. A blasting system which includes a plurality of length of low energy fuse which have been connected together in accordance with the method as claimed in any one of Claims 1 to 5 inclusive. V~ Ca C i i; ii L- 'r::-lj i U -14
21. A new blasting system substantially as described and as illustrated herein. /V CC H1 A blasting system whieh ineludcs a plurality of Apt*hs energy fuse which have been connected together in acco Aaence with the method as claimed in any one of claims 1 inclusive.
22. A ne asting system substantially as described and as patedths.da BY ITS PATENT ATTQRIZ' $41 A
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA869391 | 1986-12-11 | ||
| ZA86/9391 | 1986-12-11 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU8218087A AU8218087A (en) | 1988-06-16 |
| AU601786B2 true AU601786B2 (en) | 1990-09-20 |
Family
ID=25578664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU82180/87A Ceased AU601786B2 (en) | 1986-12-11 | 1987-12-07 | Interconnection of low energy fuses |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU601786B2 (en) |
| ZW (1) | ZW22987A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU617176B2 (en) * | 1988-06-07 | 1991-11-21 | Aeci Limited | A connector for low energy fuse |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU1880845A (en) * | 1943-04-17 | 1946-05-30 | Hercules Powder Company | Improvements in and relating to blasting and like charges or cartridge assemblies |
| GB1004711A (en) * | 1961-09-11 | 1965-09-15 | Davey Bickford Smith Cie | Improvements in mine and quarry blasting |
| AU3571478A (en) * | 1977-06-01 | 1979-11-08 | Cxa Ltd | Explosives initiation assembly |
-
1987
- 1987-11-30 ZW ZW229/87A patent/ZW22987A1/en unknown
- 1987-12-07 AU AU82180/87A patent/AU601786B2/en not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU1880845A (en) * | 1943-04-17 | 1946-05-30 | Hercules Powder Company | Improvements in and relating to blasting and like charges or cartridge assemblies |
| GB1004711A (en) * | 1961-09-11 | 1965-09-15 | Davey Bickford Smith Cie | Improvements in mine and quarry blasting |
| AU3571478A (en) * | 1977-06-01 | 1979-11-08 | Cxa Ltd | Explosives initiation assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| AU8218087A (en) | 1988-06-16 |
| ZW22987A1 (en) | 1989-06-21 |
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