US3264987A - Method of delayed ignition in blasting - Google Patents
Method of delayed ignition in blasting Download PDFInfo
- Publication number
- US3264987A US3264987A US438529A US43852965A US3264987A US 3264987 A US3264987 A US 3264987A US 438529 A US438529 A US 438529A US 43852965 A US43852965 A US 43852965A US 3264987 A US3264987 A US 3264987A
- Authority
- US
- United States
- Prior art keywords
- fuse
- igniter
- water
- mixture
- ignition
- 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
Links
- 230000003111 delayed effect Effects 0.000 title claims description 6
- 238000000034 method Methods 0.000 title description 5
- 238000005422 blasting Methods 0.000 title description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 239000000203 mixture Substances 0.000 claims description 12
- 230000002940 repellent Effects 0.000 claims description 7
- 239000005871 repellent Substances 0.000 claims description 7
- 229910044991 metal oxide Inorganic materials 0.000 claims description 5
- 150000004706 metal oxides Chemical class 0.000 claims description 5
- 239000002195 soluble material Substances 0.000 claims description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 8
- 239000000126 substance Substances 0.000 description 7
- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical compound [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000000292 calcium oxide Substances 0.000 description 5
- 235000012255 calcium oxide Nutrition 0.000 description 5
- 239000004615 ingredient Substances 0.000 description 5
- 239000000654 additive Substances 0.000 description 3
- 235000019359 magnesium stearate Nutrition 0.000 description 3
- ABBQHOQBGMUPJH-UHFFFAOYSA-M Sodium salicylate Chemical compound [Na+].OC1=CC=CC=C1C([O-])=O ABBQHOQBGMUPJH-UHFFFAOYSA-M 0.000 description 2
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 2
- 229930006000 Sucrose Natural products 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical class [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 2
- 150000001720 carbohydrates Chemical class 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 150000003873 salicylate salts Chemical class 0.000 description 2
- 229960004025 sodium salicylate Drugs 0.000 description 2
- 229960004793 sucrose Drugs 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000008247 solid mixture Substances 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C9/00—Time fuzes; Combined time and percussion or pressure-actuated fuzes; Fuzes for timed self-destruction of ammunition
- F42C9/08—Time fuzes; Combined time and percussion or pressure-actuated fuzes; Fuzes for timed self-destruction of ammunition the timing being caused by chemical action, e.g. of acids
Definitions
- control of some prescribed time for the ignition of the fuse shall be regulatable by the particular chemicals used and their careful preparation.
- Such chemicals being used in the form of a solid mixture containing the essential chemical substance or substances to which water is added as the activating agent. It is a feature of this invention that in its application no actively poisonous ingredients are used, nor are toxic gases generated.
- an igniter for a fuse comprises a holder for the end of the fuse to bring it into heat contact with an anhydrous metal oxide mixed with water repellent which on contact with water, form the required regulatable time barrier to the hydration of the oxide to produce the required heat.
- a water soluble ingredient is used or a mixture of both the water soluble ingredients and the water repellent material.
- anhydrous metal oxide to be unslaked lime in granular form mixed with the delay producing additives and the mixture pressed to a suitable form.
- the invention provides also for the delay producing additives to include saccharides and metal salicylates together with metal stearates.
- the invention also provides a container for the igniter consisting of a non-metallic cylinder with a lid, both impervious to water, said lid perforated with an aluminium tube, said tube closed at its end and in which the end of the fuse is crimped. With each igniter there is supplied a proper proportion of water in a sealed plastic bag.
- the amount of water required to make the mixture react effectively will be approximately twenty-two and one half percent of the weight of the calcium oxide.
- the figure shows an ignition package.
- the package forming the igniter is illustrated in the accompanying drawing in which 1 shows a waterproof container closed by a cover 2, through which passes the tube 3.
- the fuse 9 has its end placed in the tube 3 and crimped therein.
- the container 1 is the block of heat producing material 5 the tube 3 therein is closed at its bottom end 4 and at its top suitably attached to the cover 2.
- the igniter is to be made active the plastic bag 6 of water 7 is punctured and the water tipped into the container 1 and the cover 2 fastened thereto. Vents 8 should be made to allow steam to escape under the cover 2.
- the igniter is now set and in due time, depending on the provisions made as above described, the fuse will become ignited.
- an impervious bag 10 encloses the igniter and is sealed at both ends. If the bag has been punctured it will collapse completely on being squeezed, if it is still sealed the igniter should be in good condition.
- 11 is a wire bail to hold the cover from falling off the top of container 1.
- An igniter for delayed ignition of a fuse comprising means for holding the end of said fuse in heat contact with a metal oxide, well mixed with water soluble material and a water repellent, said mixture providing a time regulator for the hydration of said metal oxide when a water charge is added to the mixture.
- a mixture for a fuse igniter consisting of unslaked lime and time delaying additives comprising metallic salicylates, metallic stearates and saccharides.
- D 3 A mixture for a fuse igniter consisting of unslaked lime, 1.8 percent of its weight of sodium salicylate and 2 percent of its weight of magnesium stearate and also 2.1 percent of its weight of cane sugar.
- a non-metallic water proof container holding a mixture of materials forming an igniter for delayed ignition of a fuse including a vented cover into which an aluminium closed ended tube is secured to come into heat contact with the mixture in said container, said container being enclosed in a bag of moisture impervious material.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Cookers (AREA)
- Catching Or Destruction (AREA)
Description
1966 G. M. PRATLEY 3,264,987
METHOD OF DELAYED IGNITION IN BLASTING Filed March 10, 1965 GEozQe Mon 779G115. fiflney ,4- rpm.
Patented August 9, 1966 3,264,987 METHOD OF DELAYED IGNITION IN BLASTING George M. Pratley, Factoria, Luipaardsvlei, Transvaal, Republic of South Africa, assignor to Pratley Igniters (Proprietary) Limited, Factoria, Luipaardsvlei, Transvaal, Republic of South Africa Filed Mar. 10, 1965, Ser. No. 438,529 4 Claims. (Cl. 10227) This invention relates to the ignition of igniter cord or fuse as used in blasting operations and hereinafter termed a fuse; in a method of regulating the delay in such ignition, and in the apparatus for carrying out the method.
Obtaining the ignition of an igniter cord or a fuse by the use of chemicals is well known and numerous chemicals have been used and their reactions have been regulated by various means. In this specification the word fuse will be used for the ignition means between the igniter and the explosive.
It is the object of this invention to provide that the control of some prescribed time for the ignition of the fuse shall be regulatable by the particular chemicals used and their careful preparation. Such chemicals being used in the form of a solid mixture containing the essential chemical substance or substances to which water is added as the activating agent. It is a feature of this invention that in its application no actively poisonous ingredients are used, nor are toxic gases generated.
According to this invention an igniter for a fuse comprises a holder for the end of the fuse to bring it into heat contact with an anhydrous metal oxide mixed with water repellent which on contact with water, form the required regulatable time barrier to the hydration of the oxide to produce the required heat.
According to this invention as an alternative to the water repellent material, a water soluble ingredient is used or a mixture of both the water soluble ingredients and the water repellent material.
Other features of the invention provide for the anhydrous metal oxide to be unslaked lime in granular form mixed with the delay producing additives and the mixture pressed to a suitable form.
The invention provides also for the delay producing additives to include saccharides and metal salicylates together with metal stearates.
The invention also provides a container for the igniter consisting of a non-metallic cylinder with a lid, both impervious to water, said lid perforated with an aluminium tube, said tube closed at its end and in which the end of the fuse is crimped. With each igniter there is supplied a proper proportion of water in a sealed plastic bag.
There are several other ingredients both water soluble, and water repellents which could be used, with of course the necessary changes in the mixture but the most suitable formula has been used to describe the invention.
In carrying out the invention in one preferred manner, to a given weight of calcium oxide there is mixed two percent of its weight of sodium salicylate and a similar weight of magnesium stearate and also a similar weight of cane sugar. All these added materials are in dry powder form and are thoroughly mixed in the sequence above mentioned. They are compressed as a block or made up into small pellets and placed in the container above mentioned.
The amount of water required to make the mixture react effectively will be approximately twenty-two and one half percent of the weight of the calcium oxide.
Under normal conditions after the water is added there will be a delay of about one hour after which the fuse, buried in the wetted mixture, will be ignited through the chemical reaction taking place.
There are of course many other chemicals which may be used but the above provides a typical example of what is required. By varying the amount of the water soluble ingredients in the case mentioned and the amount of the magnesium stearate water repellent, the time of ignition can be varied as desired.
The figure shows an ignition package.
The package forming the igniter is illustrated in the accompanying drawing in which 1 shows a waterproof container closed by a cover 2, through which passes the tube 3. On assembly, the fuse 9 has its end placed in the tube 3 and crimped therein. In the container 1 is the block of heat producing material 5 the tube 3 therein is closed at its bottom end 4 and at its top suitably attached to the cover 2. When the igniter is to be made active the plastic bag 6 of water 7 is punctured and the water tipped into the container 1 and the cover 2 fastened thereto. Vents 8 should be made to allow steam to escape under the cover 2.
The igniter is now set and in due time, depending on the provisions made as above described, the fuse will become ignited.
If the igniter is to be preserved in good condition until brought into use it must be kept free from contact with moist air. For this purpose an impervious bag 10 encloses the igniter and is sealed at both ends. If the bag has been punctured it will collapse completely on being squeezed, if it is still sealed the igniter should be in good condition. 11 is a wire bail to hold the cover from falling off the top of container 1.
What I claim as new and desire to secure by Letters Patent is:
1. An igniter for delayed ignition of a fuse comprising means for holding the end of said fuse in heat contact with a metal oxide, well mixed with water soluble material and a water repellent, said mixture providing a time regulator for the hydration of said metal oxide when a water charge is added to the mixture.
. 2. A mixture for a fuse igniter consisting of unslaked lime and time delaying additives comprising metallic salicylates, metallic stearates and saccharides.
D 3. A mixture for a fuse igniter consisting of unslaked lime, 1.8 percent of its weight of sodium salicylate and 2 percent of its weight of magnesium stearate and also 2.1 percent of its weight of cane sugar.
4. A non-metallic water proof container holding a mixture of materials forming an igniter for delayed ignition of a fuse including a vented cover into which an aluminium closed ended tube is secured to come into heat contact with the mixture in said container, said container being enclosed in a bag of moisture impervious material.
References Cited by the Examiner UNITED STATES PATENTS 255,042 3/1882 Smith et al. 10223 273,399 3/1883 Schneebeli 10224 963,161 7/1910 Lilley 10222 1,167,288 1/ 1916 Frensdorf 10227 BENJAMIN A. BORCHELT, Primary Examiner.
V. R. PENDEGRASS, Assistant Examiner.
Claims (1)
1. AN IGNITER FOR DELAYED IGNITION OF A FUSE COMPRISING MEANS FOR HOLDING THE END OF SAID FUSE IN HEAT CONTACT WITH A METAL OXIDE, WELL MIXED WITH WATER SOLUBLE MATERIAL AND A WATER REPELLENT, SAID MIXTURE PROVINDING A TIME
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US438529A US3264987A (en) | 1965-03-09 | 1965-03-10 | Method of delayed ignition in blasting |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB999865A GB1041953A (en) | 1965-03-09 | 1965-03-09 | Improved method of delayed ignition in blasting |
| US438529A US3264987A (en) | 1965-03-09 | 1965-03-10 | Method of delayed ignition in blasting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3264987A true US3264987A (en) | 1966-08-09 |
Family
ID=26243321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US438529A Expired - Lifetime US3264987A (en) | 1965-03-09 | 1965-03-10 | Method of delayed ignition in blasting |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US3264987A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060005827A1 (en) * | 2004-05-04 | 2006-01-12 | Candle Corporation Of America | Heater product, system and composition |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US255042A (en) * | 1882-03-14 | Thomas moore | ||
| US273399A (en) * | 1883-03-06 | Blasting-cartridge | ||
| US963161A (en) * | 1909-12-06 | 1910-07-05 | Simeon Lilley | Means for igniting fuses. |
| US1167288A (en) * | 1915-05-24 | 1916-01-04 | Sigmund Frensdorf | Fuse-igniter. |
-
1965
- 1965-03-10 US US438529A patent/US3264987A/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US255042A (en) * | 1882-03-14 | Thomas moore | ||
| US273399A (en) * | 1883-03-06 | Blasting-cartridge | ||
| US963161A (en) * | 1909-12-06 | 1910-07-05 | Simeon Lilley | Means for igniting fuses. |
| US1167288A (en) * | 1915-05-24 | 1916-01-04 | Sigmund Frensdorf | Fuse-igniter. |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060005827A1 (en) * | 2004-05-04 | 2006-01-12 | Candle Corporation Of America | Heater product, system and composition |
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