US1829855A - Blasting cartridge - Google Patents

Blasting cartridge Download PDF

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Publication number
US1829855A
US1829855A US392849A US39284929A US1829855A US 1829855 A US1829855 A US 1829855A US 392849 A US392849 A US 392849A US 39284929 A US39284929 A US 39284929A US 1829855 A US1829855 A US 1829855A
Authority
US
United States
Prior art keywords
electrode
cartridge
pressure
chamber
gas
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
US392849A
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English (en)
Inventor
Raymond W Dull
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
Priority to BE373349D priority Critical patent/BE373349A/xx
Application filed by SAFETY MINING CO filed Critical SAFETY MINING CO
Priority to US392849A priority patent/US1829855A/en
Priority to FR702235D priority patent/FR702235A/fr
Priority to DE1930552576D priority patent/DE552576C/de
Application granted granted Critical
Publication of US1829855A publication Critical patent/US1829855A/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 blasting cartridges of the general type shown in the Ferrell et al. Patent No. 1,610,274, granted December 14, 1926.
  • this type of cartrid e consists of a substantially c lindrical stee shell having an internal gas c amber, a pressure responsive discharge device associated with one end of the shell and charging and energizing means -associated with the other end of the shell.y
  • The'energizing means is in the form of an electrode which.
  • the electrode forms one terminal of a circuit including an electrically activated heat producing device, as an intermediate element, and the steel shell, as the other electrode or terminal.
  • the function of the electrode requires that it be reliably insulated from the shell and the fact that it en ters the gas chamber requires that it be well packed to prevent leakage of gas and withstand pressure.
  • An object of the present invention is to provide a remedy for these defects.
  • Figure 1 is a view in side elevation with a portion of the wall Lbroken away' to disclose the position of the heater ⁇ in a cartridge of the type under consideration
  • FIG. 2 is a view in longitudinal section of a cartridge embodying my invention
  • Figure 3 is a view in taken along line 3-3 of Figure 2', y
  • Figure 4 is a view in transverse section taken along line 4-4 of Figure 2
  • Figure 5 is a transverse sectional view taken along line 5-5 of Figure 2.
  • a cartridge which in general ⁇ comprises a substantially cylindrical metallic body 1, having an internal gas chamber 2, the open end of which is adapted to be closed and sealed by means of a rupturable disc 3.
  • This disc seats against a shoulder 4 .formed on the body and is backed up by a relatively hard steel shear ring 5.
  • the disc and shear ring are heldin assembled relation with respect to the cartridge body by means of the tubular portion 6 of a discharge cap 7.
  • the portion 6 is externally threaded and engages corresponding threads formed internally of the discharge end of the cartridge.
  • the discharge cap is provided with an axial gas passage 8 and a plurality of transverse or radially arranged outlet ports 9.
  • the opposite end of the cartridge is provided lwith an elec- 'trode 10 which extends into the gas chamber 2 and which is eiectively sealed and insulated with respect to the cartridge body.
  • a valve 11 cooperates with the outer end of the electrode 10 to control the passage of gas therethrough and into the chamber.
  • a terminal cap 12 associated with the extreme end of the cartridge body rovides means a source of electricity may be connected to the electrode and metallic cartridge bog'yl respectively.
  • the discharge end thereof One of the principal features is the construction and mounting of the electrode 10 in the end of the shell body. It might be stated in this connection that the function of the electrode is to make contact with one end of an electrically energizable heater unit 13, the opposite end of which is adapted to contact with some portion of the metallic cartridge body or some element having electrical contact therewith,
  • the electrode 10 passes through an aperture in the end wall 14 of the gas chamber 2.
  • a substantially cylindrical pocket 15 and on the opposite side of the wall the shell body is extended in sleeve-like form to provide an internal pocket substantially circular in cross section.
  • a flange 17 is formed on the electrode and this flange is disposed within the cylindrical pocket 15.
  • Insulating members 18 and 19 serve to separate the electrode from the metallic shell body in order to prevent the passage of electricity directly from one to the other.
  • the inner end of the electrode is surrounded by an insulating sleeve 20 which serves to separate the electrode from the surrounding nut 21 which has electrical connection with the cartridge body.
  • the head of nut 21 is of heXagon or other suitable form adapted to receive, a socket wrench or the like and the periphery of the nut is provided with screw threads for cooperation with corresponding threads formed internally of the ocket 15.
  • At e nut may be ad- ⁇ justed to provide the necessary pressure betwe n the adjacent surfaces of the Bange 17, wall 14 and interposed insulating member to provide effective seal against the escape of gas from the chamber 2.
  • This nut by virtue of its position and relation to the electrode performs anadditional and very important function in the cartridge.
  • the cross sectional area of the inner end of the electrode which is exposed to the pressure within the gas chamber is substantially equal to, or less than the area of the sealing surfaces and in this relationship lies the solution to the problem of providin an effective and durable seal for the e cctrode. If this relationship is not employed, it is practically impossible to lind an insulating material capable of withstanding the pressures involved in a cartridge of this character.
  • An axial passage 23 extends from the outer end of the electrode to a point adjacent the inner end thereof at which point a transverse passage 24 is located to place passage 23 in communication with the interior of the gas chamber.
  • the valve body 25 which carries valve member 11 is screw threaded on the outer end of the electrode and is insulated 'from the cartridge body by means of an insulating disc 27.
  • a charging port 26 in the valve body communicates with the interior thereof and with the end of passage 23 when the valve member 11 is adjusted out of engagement with the end of the electrode.k
  • the terminal cap 12 is adapted to be detachably connected with the end of the cartridge body by means of suitable lugs and bayonet slots as indicated at 27 and 28.
  • Metallic plug 29 is centrally positioned in the terminal cap and is insulated therefrom by the disc 30 and sleeve 31.
  • a setscrew 32 is provided for the pur ose of securing a conductor in thev plug. may be secured in the terminal cap by means of theaperture 33 and setscrew 34. Electrical contact is established between the plug 29 and the electrode by means of a coil spring 35 having one end engaging the plug and the op osite end engaging the valve body.
  • a short circuiting device for establishing an electrical connection between the electrode and the shell body.
  • This device consists of a sleeve member 36 having an inwardly directed flange 37 which is adapted to cooperate with a lurality of knife edge contacts 39 forme on the under surface of the valve body.
  • a spring 38 is interposed between the flange 37 and the outer surface of the wall14. This spring tends to normally maintain the flange 37 in engagement with the contacts 39 and .since the spring is in electrical contact with the body of the cartridge, a short circuit is provided from the electrode to the body.
  • the sleeve 36 is so designed as to length that it 'is adapted to be engaged'and moved by the end of the terminal cap 12 when the latter is attached to the cartridge, thus breaking the connection between flange 37 and contacts 39.
  • the extreme inner end of the electrode 10 is provided with external screw threads for second conductor 1 lill llU
  • Slots 43 are provided in the end of the support 41 to receive a suitabl formed wrench to be used in assembling t e heater support on the electrode.
  • the cartridge hereinabove described is adapted to be charged with a highly compressed or liquefied gas through the valve controlled passage in the electrode.
  • the dis- ⁇ charge of the cartridge is effected by connecting the leads from a source of electricity to the electrode and cartridge body respectively, thereby includin the heater unit in circuit with-a source o electricity.
  • the heater unit gives oi a suilicient amount of heat to va orize ⁇ the charge within thecartridge an increase pressure thereof to a predetermined point at which the disc 3 is designed to rupture.
  • the rupture of disc 3 permits the escape of the gaseous charge through passage 8 and f radial ports 9 of the discharge cap and into the material to be blasted.
  • a blasting cartridge comp a me talli'c body having an internal gas amber, an electrode in rojecting thru an ope said body and) having a portion thereo e posed to the-pressure within said chamber, an insulating membgr inte between said electrode and the walls o said opening, cooperating sealin surfaces on said electro e an body, an ins ating and sealing member between said surfaces, the eiective area of the sealinglsurface on said ele'ctrode being substantia y equal to or greater than the area of the ortion expod to the pressure within the c amber.
  • a blasting cartridge comprisin a metallic body having an internal gas c amber, an electrode ro3ecting thru an opening in said body and) having a portion thereof exposed to the pressure within said chamber, coo rating pressure resistin surfaces on sai electrode and body, the e ective area of said ressure resist' surfaces being at least equaFto the area of t at surface of theielectrode which is exposed to the pressure within the chamber.
  • a blasting cartridge comp a metallic body having an internal gas c amber
  • said body having a circular opening thru a wall thereof and a cylindrica pocket ad- 'acent said opening on the interior of said dy and communicatin with said chamber an electrode positioned in said opening and extending on radial flan within sai on said electrode and disposed pocket, an insulat' and sealing member interposed betweent e end wall of said pocket and one face of said flange, and means surrounding said electrode and actin against the other face of said flange for eectingsthe sealed relation, said means serving to prevent access of pressure within the chamber to the inner radial fa'ce of said flange.
  • a blasting cartridge comprising a metallic body having an internal gas chamber, said body having a circular opening thru a wall thereof and a cylindrical pocket ad- 'a'cent said openin on the interior of said dy and communicating with said chamber an electrode positioned in said enin an ⁇ extending on opposite sides of sai w an insulatin sleeve ositioned between said electrode an the wa lof said circular opening a ra'dial flan on said electrode disposed within said poc et, an insulati member interposed between the end wa of said opposite sides of said wall, a
  • astmg' cartri ge comprising a su stantially cylindrical metalli'crbody having a gas chamber formed therein, a pressure 5 responsive discharge device associated with one end of said body and gas chamber, a
  • transverse wall adjacent the opposite end of said body said wall havin a perforation therethru leading into the c amber, an electrode extending thru said perforation and into the chamber, a radial ian e formed intermediate the ends of said e ectrode, said flan e being positioned within the chamber and aving a radial surface adapted for cooperation with the inner radial surface of said transverse wall to provide a seal, a nut surrounding the inner end of said electrode and adapted to coact with the otherl radial face of said fi e, said nut having threaded engagement wit the interior of said body whereby axial movement of the electrode may be eie'cted, and insulating material interposed between adjacent surfaces of the electrode and the body and nut tively.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
US392849A 1929-09-16 1929-09-16 Blasting cartridge Expired - Lifetime US1829855A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE373349D BE373349A (enrdf_load_stackoverflow) 1929-09-16
US392849A US1829855A (en) 1929-09-16 1929-09-16 Blasting cartridge
FR702235D FR702235A (fr) 1929-09-16 1930-09-08 Perfectionnements aux cartouches de mine
DE1930552576D DE552576C (de) 1929-09-16 1930-09-11 Sprengpatrone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US392849A US1829855A (en) 1929-09-16 1929-09-16 Blasting cartridge

Publications (1)

Publication Number Publication Date
US1829855A true US1829855A (en) 1931-11-03

Family

ID=23552258

Family Applications (1)

Application Number Title Priority Date Filing Date
US392849A Expired - Lifetime US1829855A (en) 1929-09-16 1929-09-16 Blasting cartridge

Country Status (4)

Country Link
US (1) US1829855A (enrdf_load_stackoverflow)
BE (1) BE373349A (enrdf_load_stackoverflow)
DE (1) DE552576C (enrdf_load_stackoverflow)
FR (1) FR702235A (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1156034B (de) * 1954-11-12 1963-10-24 Olin Mathieson Gasdruck-Sprengvorrichtung fuer den Bergbau u. dgl.

Also Published As

Publication number Publication date
FR702235A (fr) 1931-04-02
DE552576C (de) 1932-06-15
BE373349A (enrdf_load_stackoverflow)

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