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US1855740A - Progressive heating cartridge - Google Patents

Progressive heating cartridge Download PDF

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Publication number
US1855740A
US1855740A US333400A US33340029A US1855740A US 1855740 A US1855740 A US 1855740A US 333400 A US333400 A US 333400A US 33340029 A US33340029 A US 33340029A US 1855740 A US1855740 A US 1855740A
Authority
US
United States
Prior art keywords
heat
cartridge
ignition
heating
blasting
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
Application number
US333400A
Other languages
English (en)
Inventor
Ferrell Dent
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SAFETY MINING Co
Original Assignee
SAFETY MINING CO
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SAFETY MINING CO filed Critical SAFETY MINING CO
Application granted granted Critical
Publication of US1855740A publication Critical patent/US1855740A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F42B3/04—Blasting cartridges, i.e. case and explosive for producing gas under pressure
    • F42B3/06—Blasting cartridges, i.e. case and explosive for producing gas under pressure with re-utilisable case

Definitions

  • This invention relates to improvements in the method of discharging cartridges, such as for example, blasting cartridges, and to means for practicing the improved discharging method.
  • the invention is herein illustrated as apcartridges of the type comprising a casing having carbon dioxide contained therein under pressure together with suitable means for raising the temperature of the carbon dioxideto or slightly above its critical temperature, whereby the cartridge is discharged by rupturing one wall thereofgiving vent to the expanding gas which acts to bring down a Wall of coal, rock, or other material in accordance with the use to which the cartridge is put.
  • This type of cartridge is fully described and claimed in the copending application, Serial No. 169,441, filed February 1:2, 1927, by the applicant and Arthur W. Helmholtz as joint it lventors, and it represents the type of device to which the present ninvention relates and on which it is an improvement.
  • blasting operations such as mine blasting operations
  • explosions occurring in the rooms ofthe mines caused by explosive gases which sometimes accumulate in explosive volumes, being set off or ignited by sparks issuing from the cartridge during blasting discharge.
  • This danger is for the most part entirely eliminated in blasting operations where carbon dioxide or similar lblasting mediums are employed due to the inherent characteristics of this type of medium.
  • the blasting force of carbon dioxide is derived from its power of vaporization and expansion upon being heated to or slightly above its critical temperature when in liquid form and under pressure, which action is entirely diterent from that of ordinary explosive substances, such as dynamite for instance.
  • a heating element which may be initially ignited by any suitable means such as by an ⁇ electrical current, which means is the most convenient and thus the most preferable, which will develop exactly the amount of heat necessary for discharging the cartridge, but will not continue its igniting or burning action after the cartridge has been discharged.
  • a heating element which is entirely free from all possibility of emitting sparks, or ignited or igniting material such as might be presented in contact with explosive gases in the mine resulting in an explosion in the mine room causing damage to property and injury to the Workers.
  • the invention accordingly proceeds upon the principle of developing the heat necessary to raise the blasting medium to or above its critical temperature, progressively, that is to say, little at a time until the total required heat is reached. Although this involves some time element between the instant of initial ignition and resulting discharge, it must be borne in mind that the entire heating action is extremely rapid and in practice is found to occur within the limits of approximately one-twentieth of a second.
  • This progressive heating when employed with me- I diums, such as carbon dioxide, acts to assure a high de ree of safety, as it is found that the cartrige will discharge immedlatel upon reaching the critical .temperature wit further ignition of the heating material autowill be required, but due to slight variation tion will start from one this cannot always be done, and, therefore, a
  • the heating element may be actually constructed in shape relativelylong with a relatively small cross-sectional area, and provided with means, such as a fusing element, match head, or squib, for initiating the igniting action, located in a predetermined local volume thereof, so that the igniting acpredetermined point and continue of its own accord progressively throughout the entire length of the element. Due to the relatively small cross-sectional area of the element, the volume of heating material burning or undergoing igntion at any one instant, is relatively small and coned in the expanding sequently the heat required for discharge is progressively developed as the heating element burns.
  • the progressive heating action can be' proinitially ignited and by caus- ⁇ heating elements shown in views siml vcartridge construction will not be prised even though the igniting 'action 'be' K is not to be considered as limiting the invention in any particular.
  • the scope of the invention will be determinable from an under- 4 standing of the present disclosure as one embodiment thereof, and with an appreciation of the advantages produced in the particular embodiment illustrated.
  • FIG. 1 is a cross-sectionalview in side elevation'of a cartridge-equipped with a heating element constructed in accordance with this invention
  • Figure 2 is a cross-sectional view of a heating element constructed in accordance with this invention
  • i Figures 3, 4 and 5 are modified ty es of Ilar to Figure 2.
  • the present invention is disclosed as embodied in a cartridge comprising a casing 10 having a ru turabledisk 11 and directing cap 12 at the. ischarge end and means 13 for establishing an electrical connection for the heating element, and for introducing the blasting medium into the cavity 14.
  • vTh'e'f described-5' in detail as it is substantially the same as disinserted in the position' shown in Figure 1 with its electrical connection 16 at one end in contact with the rupturable disk 11 and the electrical connection 17 at its opposite end inl contact with the plate 18 constituting the other terminal for theelectrical circuit.
  • the heating element comprises a tube 19 which may be of any suitable material, such as for instance, wax paper, which is found to serve well in practice, having. closing plugs 20 at its two ends formed of any suitable material, such as for instance, cork.
  • the heating mixture 20, is containedV within the tube 19 and a conducting wire 21 terminating at one endas at 16, and at the other end as at 17 by passing between the corks 20 and the tube 19 is lalso passed through the tube.
  • VThe wire terminals are preferably in the form of a small coil spring so as to assure more perfect contact.
  • the mixture 20 may be'of any suitable ma- I terial, such as for instance, a mixture of sodium chlorate, aluminum, and wood char'- coal, all mixed together in suitable portions,
  • the electrical connection 2l has connected in its length a match head or squib 22 embedded in the material so that upon the passage of electrical current through the match head or squib an ignition of the material is started locally in the area immediately surrounding the match head or squib.
  • the conducting Wire may be of any suitable material, such as of soft iron Wire, copper, or nichrome.
  • a diminished amount of ignition material is provided, the remaining portion of the tube being lled with a suitable inert material 23, such as fullers earth, or like substance.
  • a slightly diderent form of match head or squib is shown as at 24 serving, however, to initiate the ignition in a local area the same as described above.
  • a fusible Wire 25 made of copper or like suitable material is provided for initiating the ignition whereby the material is ignited throughout a local area immediately surrounding'the wire 25. It is preferable to provide the tubes 19 of Water proof paper or of any material Which will contain the material and maintain a predetermined form according to the contour desired.
  • a suitable exploder such as for example, a magneto or current and switch line
  • the material contained within the heating element is ignited throughout its area immediately around the match head or squib so that the material once ignited causes progressive ignition throughout the length of the heating element, further, that this ignition will continue until the proper heat is developed within the container for bringing the temperature of the medium to or slightly abovev its critical temperature or to the discharging temperature.
  • a relativelylong container having a relatively small cross-sectional area, said container having a mixture therein of sodium chlorate,
  • a relatively long container having a relativelyl small cross-sectional area, said container having a mixture therein of sodium chlorate, substantially 81%; aluminum, substantially 13%; and carbon, substantially 6%; and means for initiating ignition thereof throughouta local area of its volume.
  • a heater .unit for use in gas charged blasting cartridges comprising a relatively long body of combustible material of relatively small cross sectional area and means for initiating ignition of said material throughout a small area, all for the purpose of developing ⁇ therequired amount of heat in a continuously progressive manner and avoiding an excess of heat by reason of the autothecombustion tol matic extinguishment of the heater unit ims mediately upon discharge of the cartridge.
  • a heater unit for use in gas charged blasting cartridges comprising an 'elongated tubeof relatively small cross sectlonal areaJ containing a readily ignitible heat producing material, said mate said tube 54 o'f said material lengthwise'of said tube with conse the point at which Slgned at Mario January, 1929.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
US333400A 1928-10-05 1929-01-18 Progressive heating cartridge Expired - Lifetime US1855740A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1855740X 1928-10-05

Publications (1)

Publication Number Publication Date
US1855740A true US1855740A (en) 1932-04-26

Family

ID=10892078

Family Applications (1)

Application Number Title Priority Date Filing Date
US333400A Expired - Lifetime US1855740A (en) 1928-10-05 1929-01-18 Progressive heating cartridge

Country Status (4)

Country Link
US (1) US1855740A (fr)
BE (1) BE358671A (fr)
FR (1) FR670613A (fr)
NL (1) NL29911C (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732800A (en) * 1956-01-31 coursen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732800A (en) * 1956-01-31 coursen

Also Published As

Publication number Publication date
NL29911C (fr)
BE358671A (fr)
FR670613A (fr) 1929-12-02

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