US2075969A - Blasting explosive cartridge and borehole charge - Google Patents
Blasting explosive cartridge and borehole charge Download PDFInfo
- Publication number
- US2075969A US2075969A US736752A US73675234A US2075969A US 2075969 A US2075969 A US 2075969A US 736752 A US736752 A US 736752A US 73675234 A US73675234 A US 73675234A US 2075969 A US2075969 A US 2075969A
- Authority
- US
- United States
- Prior art keywords
- explosive
- charge
- gunpowder
- cartridge
- borehole
- 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
Images
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
-
- 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
- F42B3/28—Cartridge cases characterised by the material used, e.g. coatings
Definitions
- 'Ihis invention relates to blasting explosive cartridges and borehole charges of the type in which a core of explosive is provided with a jacket of one or more cooling substances capable of cooling 5 or blanketing the hot products of combustion, either by evolving non-infiammable gases and/ or by decomposition or change of state with corresariding absorption of heat.
- the charge of explosive may be in granular form, or in the form of a compressed pellet which may have a longitudinal channel for the introduction of an igniter, or an inner core of explosive of sensitiveness and rate of burning relatively higher than the remainder of the explosive charge.
- the 'I'he jacketing material may be applied to the explosive charge' in several ways.
- it may be cast or pressed into the form of a tube or cup into which the charge of gunpowder may be introduced either loose or in the form of a compressed pellet.
- the cartridge may be held together by a wrapping of waxed or unwaxed paper or the like.
- the charge of gunpowder may be introduced into the central space of a double-walled annulus of paper or the like containing loose jacketing material.
- the jacketing material and gunpowder- may be suitably arranged in a. container, preferably of' ⁇ metal such as tinned iron sheet, which is loaded into the borehole, or the gunpowder may be placed in the borehole in the form of a lpellet and the jacketing material placed around it.
- the jacketing material may also be formed aroun'd a pellet by pressure in a suitable mould, or the granular explosive and jacketing material. may be placed in the desired relative positions in a mould and pressed into shape simultaneously.
- the two last mentioned methods have the advantage that the cooling material is firmly adherent to the explosive core and cannot readily be separated from it.
- the requisite thickness of the sheath will depend to some extent'upon its composition, but in most cases we ilnd that a thickness of 4 mm. is sucient to render the cartridge safe for use in fiery and dusty mines. l
- Figure 1 is a sectional elevation of an apparatus suitable ior producing a sheathed cartridge of gunpowder or the like as an integral unit.
- FIGS 3 to 6 are diagrammatic representations of a sheathed cartridge produced in accordance with the invention and provided with a longitudinal channel for the insertion of an4 an annular piston C to t inside the cylinder A and over the pin B, and a thin sheet metal cylinderV E, which is used as a temporary separator between the blackpowder charge and the sheathing material. All the components are preferably made of non-ferrous metal.
- the operation of making a pressed sheathed pellet is carried out as follows.
- the cylinder A is placed in position on the base D and the pin B is inserted in position.
- 'Ihe thin walled cylinder E which is preferably provided with lateral prongs or the like to ensure its central position in the device, is placed as shown in the diagram.
- a suitable charge of blackpowder for a single pellet is poured into the space formed between 40 the annular cylinder E and the pin B, and powdered borax is poured into the annular space between the annular cylinder E and Vthe outside cylinder A until the levels of the'powders inside and outside the cylinder E are equal.
- a previously formed pellet of blackpowder and of suitable dimensions may be inserted within the cylinder E.
- Cylinder E is then withdrawn with as little disturbance of the charge as possible, and the annular piston C is placed over the pin B so that it rests lon the powder in the mould
- the whole assembly is then transferred to a suitable press and subjected to a heavy pressure until the materials are thoroughly compacted together.
- a pressure of 2 tons weight for 2 minutes is usually sumcient to produce a very compact pellet which can be handled without risk of damage.
- the assembly is taken apart by removing the ⁇ base D and pressing out the central pin B which carries the compressed pellet with it. The pellet is then easily withdrawn from the pin.
- the central pin.B is replaced by a 6 ilat circular disc.
- Automatic weighing and charging devices may be employed to supply the blackpowder and sheathing materials respectively to the mold.
- the proportion of sheathing material to explosive core is conveniently regulated by selecting an annular separatingv cylinder of appropriate diameter. v
- the materials may be used dry, or containing up to 5% moisture. Pellets which have been pressed from blackpowder containing appreciable quantities of moisture are caused to set hard by drying them after the pressing operation.
- 'I'he present invention is particularly applicable to the production of safety explosive cartridges comprising gunpowder as the explosive ingredient, for example a gunpowder consisting of approximately 75%-potassium nitrate, 15% charcoal and 10% sulphur.
- gunpowder consisting of approximately 75%-potassium nitrate, 15% charcoal and 10% sulphur.
- the proportion of these ingredients may, of course, be varied as is known in the art.
- Example 1 A cylinder of thin sheet -metal having an internal diameter of 1% inches is arranged to stand concentrically in a vertical cylindrical mould ot internal diameter 11"; inches, which' is furnished with a central pin M1" in diameter.
- Example 2 2 ozs. of gunpowder are loaded into the central space of the mould used in Example 1, on top oi. a layer of borax containing 30% borlc acid, and the annular space is then iilled as before with a mixture of powdered borax containing 30% borlc acid. The partition is then withdrawn and the pressing operation carried out as before.
- Example 4 2 ozs. of a mixture of 1 part by weight of potassium chloride with 2 parts by weight 0I Empowder are loaded into the central space ofthe press l used in Example4 1 on top of a layer of borax. The annularspace is filled with borax to the level of the gunpowder mixture. The separator is then withdrawn and a layer of borax is added to cover the gunpowder. The pressing operation is then carried out as before. The total quantity of borax used is V2 oz.
- a safety explosive cartridge or borehole charge comprising a. core of black powder and a sheath comprising a borate.
- a safety explosive cartridge or borehole charge comprising a core of black powder and a sheath comprising borax.
- a safety explosive cartridge or ⁇ borehole charge comprising a central core consisting of a compressed pellet of black powder and a sheath comprising a borate.
- a safety explosive cartridge or borehole charge comprising a central core of black powder provided with a longitudinal channel'adapted to accommodate an igniter and a, sheath for the said core comprising a borate.
- a method of forming a safety explosive cartridge which includes the step of feeding a sheathv l ing material into an annular space around a quantity of slow burning explosive and compressing the explosive and the sheathing material to form an integral unit.
- a method of forming a safety explosive cartridge which includes the step of feeding a sheathing material into an annular space around an already formed pellet of slow burning explosive and compressing the explosive and the sheathing material to form an integral unit.
- a method of forming a safety explosive cartridge which includes the steps of feeding a sheathing material into an annular space around a quantity of slow burning explosive, compressing the explosive and the sheathing material to form an integral unit and dryingvthe compressed unit to form a hard compact mass.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
- Glass Compositions (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB20801/33A GB423040A (en) | 1933-07-24 | 1933-07-24 | Improved blasting explosive cartridges and borehole charges |
Publications (1)
Publication Number | Publication Date |
---|---|
US2075969A true US2075969A (en) | 1937-04-06 |
Family
ID=10151893
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US736752A Expired - Lifetime US2075969A (en) | 1933-07-24 | 1934-07-24 | Blasting explosive cartridge and borehole charge |
Country Status (3)
Country | Link |
---|---|
US (1) | US2075969A (fr) |
BE (1) | BE404344A (fr) |
GB (1) | GB423040A (fr) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2419949A (en) * | 1944-02-07 | 1947-05-06 | Edwin J Hottinger | Device for securing a propellent charge to an artillery primer |
US2513531A (en) * | 1944-11-15 | 1950-07-04 | Ici Ltd | Safety sheathed blasting explosive cartridge |
US2541334A (en) * | 1944-05-20 | 1951-02-13 | Atlas Powder Co | Explosive assembly and method of making it |
US2563491A (en) * | 1946-07-26 | 1951-08-07 | Blasting assembly | |
US3046829A (en) * | 1959-06-22 | 1962-07-31 | Olin Mathieson | Composite propellent grains |
US3661047A (en) * | 1968-11-18 | 1972-05-09 | Us Navy | Apparatus for casting thin walled hollow cylindrical inserts |
US20110232466A1 (en) * | 2010-03-23 | 2011-09-29 | Bruce Van Stratum | Modular hand grenade |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8810691D0 (en) * | 1988-05-06 | 1988-06-08 | Ici Plc | Explosive systems & process & apparatus for preparing same |
-
0
- BE BE404344D patent/BE404344A/xx unknown
-
1933
- 1933-07-24 GB GB20801/33A patent/GB423040A/en not_active Expired
-
1934
- 1934-07-24 US US736752A patent/US2075969A/en not_active Expired - Lifetime
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2419949A (en) * | 1944-02-07 | 1947-05-06 | Edwin J Hottinger | Device for securing a propellent charge to an artillery primer |
US2541334A (en) * | 1944-05-20 | 1951-02-13 | Atlas Powder Co | Explosive assembly and method of making it |
US2513531A (en) * | 1944-11-15 | 1950-07-04 | Ici Ltd | Safety sheathed blasting explosive cartridge |
US2563491A (en) * | 1946-07-26 | 1951-08-07 | Blasting assembly | |
US3046829A (en) * | 1959-06-22 | 1962-07-31 | Olin Mathieson | Composite propellent grains |
US3661047A (en) * | 1968-11-18 | 1972-05-09 | Us Navy | Apparatus for casting thin walled hollow cylindrical inserts |
US20110232466A1 (en) * | 2010-03-23 | 2011-09-29 | Bruce Van Stratum | Modular hand grenade |
US8136437B2 (en) * | 2010-03-23 | 2012-03-20 | Martin Electronics, Inc. | Modular hand grenade |
Also Published As
Publication number | Publication date |
---|---|
GB423040A (en) | 1935-01-24 |
BE404344A (fr) |
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