US2812712A - Stemming of shot holes in blasting operations - Google Patents

Stemming of shot holes in blasting operations Download PDF

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Publication number
US2812712A
US2812712A US407994A US40799454A US2812712A US 2812712 A US2812712 A US 2812712A US 407994 A US407994 A US 407994A US 40799454 A US40799454 A US 40799454A US 2812712 A US2812712 A US 2812712A
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US
United States
Prior art keywords
plug
stemming
shot hole
wedge
shot
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
US407994A
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English (en)
Inventor
Ashurst Thomas
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.)
INTERNAT TRUBLAST STEMMING COR
INTERNATIONAL TRUBLAST STEMMING Corp Pty Ltd
Original Assignee
INTERNAT TRUBLAST STEMMING COR
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 INTERNAT TRUBLAST STEMMING COR filed Critical INTERNAT TRUBLAST STEMMING COR
Application granted granted Critical
Publication of US2812712A publication Critical patent/US2812712A/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
    • F42D—BLASTING
    • F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
    • F42D1/08—Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor
    • F42D1/18—Plugs for boreholes

Definitions

  • This invention relates to the stemming of shot holes in blasting operations and more particularly provides a stemming plug suitable for general use whether in underground or surface workings.
  • a shot hole stemming device of the kind consisting of two solid wedge-shaped members of material which is unaffected by water, comprising opposed wedging surfaces and collectively constituting a cylindrical plug dimensioned to occlude the shot hole, characterized in that at least one of the members comprising a formation suitably provided for engagement by a tool adapted to be inserted in the hole for withdrawing the members therefrom one after the other, even after they have been wedged in position in said shot hole.
  • the plug member intended for insertion rst into position in the hole may be provided with a leading end of preferably concave form and friable character, and/or, in its wedging surface, with a recessed formation, hook or other means suitable for engagement by the said tool.
  • grooves are formed along the exterior of the members which, when the latter are mutually orientated for co-engagement of their sloping or Wedge surfaces, combine to provide a channel for the passage of a fuse or of wires to the detonator or the like associated with the explosive charge.
  • Figure l is a side view of the two-member plug
  • Figure 2 is a view of the inner or leading end of the plug.
  • Figure 3 is a sectional View of a shot hole containing an explosive charge and stemmed by a plug as shown in Figures l and 2.
  • the plug member 1 has a concave inner or leading end part 2 and its opposite end finishes in an oblique flat surface 3 to provide the required wedge or taper formation; a simple recess 4 in the surface 3 suflicing as a forma- '2,812,712 Patented Y Nov. l2, 1957 Z tion' by which the member may be pushed or' pulled into and out of the shot hole.
  • the other, or outer, plug member 5 has its inner or leading end tapered arid shaped asl the complement of thevv outer end of the iirst member, whereby the face 6 may be engaged against the face 3 in the coaxial assembly of the two members shown in Figure 3.
  • the opposite orvouter end of the member 5 is given a stepped formation at '7, including a simple recess as 4 for the like purpose to the recess 4 in the member 1,
  • simple longitudinal groove 8, 8 is provided in each member 1 and 2, which grooves come into line, when the faces 3 and 6 are arranged parallel or' in Contact asin Figure 3, to admit leads or fuse as 9 from the outer end of the shot hole to the charge or the like 10 at its inner end.
  • the stemming is completed.
  • the preferably concave nose or inner end 2 of the plug may be subjected to a more or less localized disintegrating action assisting effective sealing between the periphery of the plug and the bore of the shot hole.
  • the forward portion 1 of the plug is driven outwardly against the other portion with a wedge action which thus tightens the tit of the plug in the hole to retain it therein with a force proportional-to the intensity of the explosion, and totally obviating the blow-out and wastage of the explosive force which is thus concentrated in front of the plug for effective rock shattering.
  • the plug is preferably made of concrete or the like, but may be made of any other suitable material, e. g. wood, plastic, baked clay, or brick; wood and plastic, however, like other inflammable materials, not being suitable for use in ery mines.
  • the length of a standard plug for normal use i. e. for shot holes drilled for normal charges, is conveniently about eight inches, although of course no xed dimensions can be laid down owing to the diiferent sizes of drill bits used, and the different weights of explosive placed in different kinds of holes.
  • the plug diameter s conveniently about one-eighth of an inch less than the gauge of the drill used, the clearance being sealed as a first consequence of the explosion, as already explained.
  • the plug When the plug is made of concrete or the like and if a disintegration, more especially in the region of the front end of the plug should be desired, it suilices to make the plug or its nose portion from a weak mixture and thus more or less friable under the force of the explosion; but such a provision is not essential in all circumstances, owing to the highly effective wedge action between the two plug members.
  • a shot hole stemming device comprising two solid wedge-shaped members having opposed complementary wedging surfaces and in the position with the wedging surfaces against each other, said device forming a cylindrical plug for occluding a shot hole, one of said members having a recess in the wedging surface thereof, said recess being engageable by a tool for withdrawing said member from a shot hole, and the end of the other of said wedge-shaped members opposite the wedging surface of said other wedge-shaped member having a stepped notch therein with one surface substantially longitudinally and diametrically of said cylindrical plug and the other surface substantially'transversely of said cylindrical plug,
  • said one surface having a recess therein with the said other surface extending unbroken into and forming a part of the interior wall dening .said recess, said recess also engageable by a tool for withdrawing said other wedge-shaped member from a shot hole, whereby said wedge-shaped members may be inserted into Va'shot hole with the wedging surfaces engaged and driven into the shot hole until the device abuts an explosive charge in the shot hole and the other end having the stepped notch therein is wholly within the shot hole, and in case of a misfire the two wedge-shaped members may be successively withdrawn from the shot hole by inserting the withdrawing tool into the shot hole until it strikes said other surface of said notch and can easily be guided 1 into the recess in the one surface of said notch for pulling said other wedge-shaped member from the shotrhole, and the tool may again be inserted into the shot hole until it strikes the wedging surface of said one of said wedge- Y shaped members and can easily be guided into the recess therein for pulling said

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  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
US407994A 1953-02-05 1954-02-03 Stemming of shot holes in blasting operations Expired - Lifetime US2812712A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ZA745980X 1953-02-05

Publications (1)

Publication Number Publication Date
US2812712A true US2812712A (en) 1957-11-12

Family

ID=25568505

Family Applications (1)

Application Number Title Priority Date Filing Date
US407994A Expired - Lifetime US2812712A (en) 1953-02-05 1954-02-03 Stemming of shot holes in blasting operations

Country Status (6)

Country Link
US (1) US2812712A (en, 2012)
BE (1) BE526268A (en, 2012)
CH (1) CH321760A (en, 2012)
DE (1) DE961601C (en, 2012)
FR (1) FR1092821A (en, 2012)
GB (1) GB745980A (en, 2012)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1144943A4 (en) * 1998-12-14 2002-05-22 Rocktek Ltd METHOD AND APPARATUS FOR LOADING A WELLBORE
US20040007911A1 (en) * 2002-02-20 2004-01-15 Smith David Carnegie Apparatus and method for fracturing a hard material
US6679175B2 (en) 2001-07-19 2004-01-20 Rocktek Limited Cartridge and method for small charge breaking
US6708619B2 (en) 2000-02-29 2004-03-23 Rocktek Limited Cartridge shell and cartridge for blast holes and method of use
WO2007141604A3 (en) * 2006-03-31 2008-02-28 Richard Andreas Lamos Blasting method for controlled multiple sequential blasts in multi-diameter blastholes
US20080047455A1 (en) * 2004-01-26 2008-02-28 Edward Walenty Tota Rock Breaking Cartridge and Use Thereof
WO2008075307A1 (en) * 2006-12-20 2008-06-26 Stephen Charles Lipschitz A plug
WO2018102858A1 (en) * 2016-12-07 2018-06-14 Rise Mining Developments Pty Ltd Improved stemming plugs
US12292271B2 (en) * 2021-05-10 2025-05-06 Vinesh LOGANATHAN Wedging arrangement to plug a blast hole

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2699102C1 (ru) * 2018-12-10 2019-09-03 Виктор Сергеевич Федотенко Подвесная скважинная забойка

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US650804A (en) * 1899-06-06 1900-05-29 George S Sanderson Tamping-plug.
US1442645A (en) * 1920-06-11 1923-01-16 Fred H Buker Blasting tool
US1480894A (en) * 1923-04-25 1924-01-15 Cockburn Arthur Tamping plug for use in blasting
US1589399A (en) * 1925-10-26 1926-06-22 Kinzbach Frank Whip stock
US1835227A (en) * 1929-08-05 1931-12-08 Charles H Lane Whip stock

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB457585A (en) * 1936-04-02 1936-12-01 Charles William Bennett Improvements in or relating to plugs for use in connexion with the firing of shots in coal mines and the like

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US650804A (en) * 1899-06-06 1900-05-29 George S Sanderson Tamping-plug.
US1442645A (en) * 1920-06-11 1923-01-16 Fred H Buker Blasting tool
US1480894A (en) * 1923-04-25 1924-01-15 Cockburn Arthur Tamping plug for use in blasting
US1589399A (en) * 1925-10-26 1926-06-22 Kinzbach Frank Whip stock
US1835227A (en) * 1929-08-05 1931-12-08 Charles H Lane Whip stock

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1144943A4 (en) * 1998-12-14 2002-05-22 Rocktek Ltd METHOD AND APPARATUS FOR LOADING A WELLBORE
US6708619B2 (en) 2000-02-29 2004-03-23 Rocktek Limited Cartridge shell and cartridge for blast holes and method of use
US6679175B2 (en) 2001-07-19 2004-01-20 Rocktek Limited Cartridge and method for small charge breaking
US20040007911A1 (en) * 2002-02-20 2004-01-15 Smith David Carnegie Apparatus and method for fracturing a hard material
US20080047455A1 (en) * 2004-01-26 2008-02-28 Edward Walenty Tota Rock Breaking Cartridge and Use Thereof
WO2007141604A3 (en) * 2006-03-31 2008-02-28 Richard Andreas Lamos Blasting method for controlled multiple sequential blasts in multi-diameter blastholes
WO2008075307A1 (en) * 2006-12-20 2008-06-26 Stephen Charles Lipschitz A plug
WO2018102858A1 (en) * 2016-12-07 2018-06-14 Rise Mining Developments Pty Ltd Improved stemming plugs
CN110062869A (zh) * 2016-12-07 2019-07-26 莱斯矿业发展控股有限公司 改进的堵塞塞子
EP3551962A4 (en) * 2016-12-07 2020-08-05 Rise Mining Developments Pty Ltd IMPROVED LOCKING PLUG
US11150068B2 (en) 2016-12-07 2021-10-19 Rise Mining Development Pty Ltd Stemming plugs
EA038962B1 (ru) * 2016-12-07 2021-11-15 Райз Майнинг Дивелопментс Пти Лтд Улучшенные запирающие забойки
CN110062869B (zh) * 2016-12-07 2022-05-03 莱斯矿业发展控股有限公司 改进的堵塞塞子
AU2017371709B2 (en) * 2016-12-07 2022-12-01 Rise Mining Developments Pty Ltd Improved stemming plugs
US12292271B2 (en) * 2021-05-10 2025-05-06 Vinesh LOGANATHAN Wedging arrangement to plug a blast hole

Also Published As

Publication number Publication date
BE526268A (en, 2012)
FR1092821A (fr) 1955-04-27
DE961601C (de) 1957-04-11
GB745980A (en) 1956-03-07
CH321760A (de) 1957-05-31

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