US3608491A - Tamping plug - Google Patents

Tamping plug Download PDF

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Publication number
US3608491A
US3608491A US787161A US78716168A US3608491A US 3608491 A US3608491 A US 3608491A US 787161 A US787161 A US 787161A US 78716168 A US78716168 A US 78716168A US 3608491 A US3608491 A US 3608491A
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US
United States
Prior art keywords
wide
strip material
small end
plug member
convolutions
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
US787161A
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English (en)
Inventor
Vernon Jan Botes
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.)
Dunaplug Pty Ltd
Original Assignee
Dunaplug Pty Ltd
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 Dunaplug Pty Ltd filed Critical Dunaplug Pty Ltd
Application granted granted Critical
Publication of US3608491A publication Critical patent/US3608491A/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 an improved plug and more par ticularly a tamping plug for bored blast holes.
  • a tamping tubular plug member having a wide end and a small end and comprising a helically wound strip of material presenting a pair of opposed wide faces, the helically wound strip material providing overlapping convolutions of progressively smaller size and which convolutions are arranged with both the wider faces of the strip material convergent toward the wide end of the member and with smaller convolutions extending from the larger convolutions, within which they are disposed, in the direction of the small end of the member whereby, on application of a force in a substantially axial direction on the small end of the member and toward the wide end of the member, the wide faces of the helically wound strip slide and engage wedgingly on one another and cause radial expansion of the convolutions for the convolution at the wide end of the member to be tightly engaged onto walls of a hole in which the member is located.
  • the outer face of the outermost convolution is preferably of substantially constant radius on the axis of the member to form a substantially true cylinder which is surmounted by a generally conical surface of substantially helically ribbed appearance presented by exposed portions of the overlapped convolutions of the helically wound strip material.
  • the outwardly directed surface of the outer appearance may be provided with ribs or other roughening formations to increase frictional engagement on the walls of the hole in which the plug member is inserted.
  • the wide end is held and the small end forced into the hole with the aid of a rod or bar to the required depth and whereby the tapering tubular member is extended in length and reduced in respect of its width.
  • the held wide end or outer end of the strip material is then slowly allowed to be moved inwardly when the length is reduced and the width increased. Said wide end may be subsequently forced further into the hole and, due
  • Such wcdging action may be increased by providing the strip material with the substantially wedge-shaped cross section.
  • the transverse end portion at the narrow end of the strip material wound spirally and outwardly overlappingly to truncated cone-shape may be twisted through an angle of approximately 90 to present a larger face disposed across the narrow end of the member.
  • the strip material should be a suitable nonferrous material but advantageously comprises a synthetic resinous or plastic material.
  • FIG. l is a pictorial view ofa tamping plug member according to the invention.
  • FIG. 2 is a cross section of a tamping plug member according to the invention, drawn to a larger scale;
  • FIG. 3 is a cross section of a tamping plug member shown in position within a hole
  • FIG. 4 is a view similar to FIG. 3 shown in a larger diameter hole.
  • FIG. 5 to are cross sections of modified forms of plug members constructed according to the invention.
  • reference numeral 10 denotes a truncated cone-shaped plug member formed by helical conto the recoiling action of the coils, expands transversely and volutions of strip material 12. The convolutions are outwardly overlapping.
  • the top end 14 of the strip is twisted through an angle of approximately as at 16, to be disposed radially and substantially diametrically across the small end 18 of the truncated cone 10.
  • the tip end 14 is provided with a hole 20 which is disposed coaxially with the axis of the truncated cone 10. However, said tip end 14 is not essential and need not be provided.
  • the strip material [2 is preferably of tapering cross-sectional shape as is clearly shown in FIG. 2.
  • the strip material 12 is preferably of a suitable synthetic resinous or themo plastic material.
  • the small end convolution according to the modification shown in FIG. 5 provides a thicker portion 22 of which the outer surface forms a truncated cone converging towards the wide end of the truncated conically shaped plug member.
  • Said portion 22 may be provided on its smaller end with a lip adapted to form a tubular region 24 and forms an axial passage 26 through which a fuse may be passed.
  • the small end convolution 22.1 according to the form of plug member shown in FIG. 6 may be provided with an outwardly flared lip 28 to present an increased projected area on the small end of the plug member.
  • Said lip 28 may be in the form of wings moulded integrally with the top convolution forming portion of the strip material.
  • Said lip 28 may be provided with radial slits if required.
  • the aforesaid small end convolution of the plug member in the forms of the invention shown in FIGS. 5 and 6 may be formed as a solid annulus to which one end of the strip material is attached.
  • a ridge 30 or a groove or recess 32 may be provided on or in the inside face of one of the larger convolutions as is shown in FIGS. 7 and 8.
  • the large end convolution is provided with such ridge 30 or groove 32 for engagement by tool means in order to facilitate the removal by extraction.
  • the cross-sectional shape of the strip material is modified and provides a step forming rib 34 on the wider edge portion of the strip material and the edge adapted to be directed towards the wide end of the plug member 10.
  • a outwardly protruding lip 36 is provided at the narrow edge of the tapering section strip material directed towards the small end of the plug member.
  • Plug members according to the invention may be manufactured by injection moulding between coacting complementary male and female moulds.
  • an open radially widening pitched spiral strip is moulded on a plane with major faces of the strip slopingly relative to the plane.
  • the spiral strip is subsequently drawn to form the truncated cone-shaped member with the major faces of the convolutions of the thus formed helix converging toward the wide end of the member.
  • coacting moulds present continuous rebatelike spiral recesses.
  • the strip material may be formed in a plane and according to a substantially rapidly widening s iral.
  • Such spiral of which the cross section of the strip material is also of tapering shape, can be manufactured by injection moulding. Such widening spiral may be subsequently wound to the required frustoconically shaped helically coiled plug member.
  • the outwardly directed face of the large end convolution is preferably roughened or provided with protrusions for increased nonslipping engagement with the surface of the hole in which it is placed.
  • the plug member according to the invention is particularly intended for use as a tamping plug to contain the gasses of combustion and explosion in a blast hole.
  • the plug member may also be used for other purposes such as for instance, as a socket plug for placement in sockets left in rock which have previously being drilled and blasted.
  • the plug member according to the invention may also be used as a wedging device to secure a bolt placed in drilled holes for the anchoring of roof bolts or the like.
  • the cross-sectional shape of the strip material may vary in respect of at least portions of its length.
  • a tapering tubular plug member having a wide end and a small end and comprising a helically wound strip of material presenting a pair of opposed wide faces, the helically wound strip material providing overlapping convolutions of progressively smaller size and which convolutions are arranged with both the wide faces of the strip material convergent toward the wide end of the member and with smaller convolutions extending from the larger convolutions, within which they are disposed, in the direction of the small end of the member whereby, on application of a force in a substantially axial direction on the small end of the member and toward the wide end of the member, the wide faces of the helically wound strip slide and engage wedgingly on one another and cause radial expansion of the convolutions for the convolution at the wide end of the member to tightly engage onto walls of a hole in which the member is located.
  • a tapering tubular plug member as claimed in claim 1 wherein a substantially conical part is provided on the end of the strip at the small end of the member, said conical part being provided with an axial passage and is arranged with its small end directed toward the wide end of the member.
  • a tapering tubular plug member as claimed in claim 1 wherein a formation for engagement by tool means, for extraction of the member, is provided on a portion of the inwardly directed wide face of the convolution at the wide end of the member.

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  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Dowels (AREA)
  • Insertion Pins And Rivets (AREA)
  • Joining Of Building Structures In Genera (AREA)
US787161A 1967-12-27 1968-12-26 Tamping plug Expired - Lifetime US3608491A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ZA677731 1967-12-27

Publications (1)

Publication Number Publication Date
US3608491A true US3608491A (en) 1971-09-28

Family

ID=25561148

Family Applications (1)

Application Number Title Priority Date Filing Date
US787161A Expired - Lifetime US3608491A (en) 1967-12-27 1968-12-26 Tamping plug

Country Status (5)

Country Link
US (1) US3608491A (enrdf_load_stackoverflow)
DE (1) DE1816758A1 (enrdf_load_stackoverflow)
FR (1) FR1598761A (enrdf_load_stackoverflow)
GB (1) GB1253218A (enrdf_load_stackoverflow)
ZM (1) ZM18768A1 (enrdf_load_stackoverflow)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4736796A (en) * 1986-06-30 1988-04-12 Arnall F James Tamp hole plug system and method
US4754705A (en) * 1986-11-17 1988-07-05 The Curators Of The University Of Missouri Mechanical stemming construction for blast holes and method of use
US5247886A (en) * 1992-10-14 1993-09-28 The Curators Of The University Of Missouri Blast plug and stemming construction for blast holes
US5253586A (en) * 1992-10-15 1993-10-19 The Curators Of The University Of Missouri Method of stemming a blast hole
US5841060A (en) * 1995-10-24 1998-11-24 Skaggs; Roger Dean Blast plug
US5936187A (en) * 1997-09-19 1999-08-10 Mocap Incorporated Blasting stemming plug
US6324980B1 (en) * 1998-05-08 2001-12-04 Cesar Estevez Bianchini Conical plug for sealing blastholes in open cut mining
US6339992B1 (en) 1999-03-11 2002-01-22 Rocktek Limited Small charge blasting apparatus including device for sealing pressurized fluids in holes
RU2229684C1 (ru) * 2002-11-20 2004-05-27 Санкт-Петербургский государственный горный институт им. Г.В. Плеханова (Технический университет) Скважинная забойка
RU2306522C1 (ru) * 2006-02-07 2007-09-20 Государственное образовательное учреждение высшего профессионального образования "Тихоокеанский государственный университет" Способ формирования рассредоточенных зарядов в обводненных скважинах
RU2306523C1 (ru) * 2006-02-07 2007-09-20 Государственное образовательное учреждение высшего профессионального образования "Тихоокеанский государственный университет" Способ формирования рассредоточенных зарядов в обводненных скважинах
RU2314487C1 (ru) * 2006-03-27 2008-01-10 Государственное образовательное учреждение высшего профессионального образования "Тихоокеанский государственный университет" Способ формирования воздушных промежутков из пенополистирола
RU2317519C1 (ru) * 2006-04-12 2008-02-20 Государственное образовательное учреждение высшего профессионального образования "Тихоокеанский государственный университет" Способ формирования воздушных промежутков элементами из пенополистирола
RU2319922C2 (ru) * 2006-04-12 2008-03-20 Государственное образовательное учреждение высшего профессионального образования "Тихоокеанский государственный университет" Способ формирования воздушных промежутков элементами из пенополистирола
RU2341766C2 (ru) * 2006-12-01 2008-12-20 Государственное образовательное учреждение высшего профессионального образования "Тихоокеанский государственный университет" Способ формирования воздушных промежутков из пенополистирола и автономная мобильная установка для его осуществления
RU2401416C1 (ru) * 2009-07-22 2010-10-10 Сергей Михайлович Федотенко Подвесная скважинная забойка
RU2409805C1 (ru) * 2009-09-29 2011-01-20 Сергей Михайлович Федотенко Подвесная скважинная забойка
RU182481U1 (ru) * 2018-06-05 2018-08-21 федеральное государственное бюджетное образовательное учреждение высшего образования "Санкт-Петербургский горный университет" Скважинная забойка
US11060832B2 (en) * 2017-03-23 2021-07-13 Pws Systems Pty Ltd Blasting method and system

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZW12688A1 (en) * 1987-10-23 1989-05-31 Ici Australia Operations Conduit construction means
RU2148784C1 (ru) * 1999-08-09 2000-05-10 Санкт-Петербургский государственный горный институт им. Г.В. Плеханова (Технический университет) Шпуровая забойка
RU2331042C1 (ru) * 2006-11-07 2008-08-10 Государственное образовательное учреждение высшего профессионального образования "Тихоокеанский государственный университет" Бетонная комбинированная забойка
RU2329463C1 (ru) * 2006-11-07 2008-07-20 Государственное образовательное учреждение высшего профессионального образования "Тихоокеанский государственный университет" Укороченная монолитная забойка
RU2338152C1 (ru) * 2006-12-25 2008-11-10 Государственное образовательное учреждение высшего профессионального образования "Тихоокеанский государственный университет" Укороченная твердеющая забойка
RU2365872C1 (ru) * 2008-05-04 2009-08-27 Государственное образовательное учреждение высшего профессионального образования "Санкт-Петербургский государственный горный институт имени Г.В. Плеханова (технический университет)" Комбинированная забойка
RU2371670C1 (ru) * 2008-05-27 2009-10-27 Государственное образовательное учреждение высшего профессионального образования "Тихоокеанский государственный университет" Комбинированная забойка
RU2444696C1 (ru) * 2010-07-29 2012-03-10 Государственное образовательное учреждение высшего профессионального образования "Тихоокеанский государственный университет" Засыпная забойка с распорным затвором

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2403386A (en) * 1941-01-30 1946-07-02 Heitzman Safety Blasting Plug Blasting plug
US2553757A (en) * 1949-02-28 1951-05-22 David C Evans Holder for spun sugar candy
US3081705A (en) * 1958-05-09 1963-03-19 Studebaker Corp Articles having laminated walls

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2403386A (en) * 1941-01-30 1946-07-02 Heitzman Safety Blasting Plug Blasting plug
US2553757A (en) * 1949-02-28 1951-05-22 David C Evans Holder for spun sugar candy
US3081705A (en) * 1958-05-09 1963-03-19 Studebaker Corp Articles having laminated walls

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4736796A (en) * 1986-06-30 1988-04-12 Arnall F James Tamp hole plug system and method
US4754705A (en) * 1986-11-17 1988-07-05 The Curators Of The University Of Missouri Mechanical stemming construction for blast holes and method of use
US5247886A (en) * 1992-10-14 1993-09-28 The Curators Of The University Of Missouri Blast plug and stemming construction for blast holes
US5253586A (en) * 1992-10-15 1993-10-19 The Curators Of The University Of Missouri Method of stemming a blast hole
US5841060A (en) * 1995-10-24 1998-11-24 Skaggs; Roger Dean Blast plug
US5936187A (en) * 1997-09-19 1999-08-10 Mocap Incorporated Blasting stemming plug
US6324980B1 (en) * 1998-05-08 2001-12-04 Cesar Estevez Bianchini Conical plug for sealing blastholes in open cut mining
US6339992B1 (en) 1999-03-11 2002-01-22 Rocktek Limited Small charge blasting apparatus including device for sealing pressurized fluids in holes
RU2229684C1 (ru) * 2002-11-20 2004-05-27 Санкт-Петербургский государственный горный институт им. Г.В. Плеханова (Технический университет) Скважинная забойка
RU2306522C1 (ru) * 2006-02-07 2007-09-20 Государственное образовательное учреждение высшего профессионального образования "Тихоокеанский государственный университет" Способ формирования рассредоточенных зарядов в обводненных скважинах
RU2306523C1 (ru) * 2006-02-07 2007-09-20 Государственное образовательное учреждение высшего профессионального образования "Тихоокеанский государственный университет" Способ формирования рассредоточенных зарядов в обводненных скважинах
RU2314487C1 (ru) * 2006-03-27 2008-01-10 Государственное образовательное учреждение высшего профессионального образования "Тихоокеанский государственный университет" Способ формирования воздушных промежутков из пенополистирола
RU2317519C1 (ru) * 2006-04-12 2008-02-20 Государственное образовательное учреждение высшего профессионального образования "Тихоокеанский государственный университет" Способ формирования воздушных промежутков элементами из пенополистирола
RU2319922C2 (ru) * 2006-04-12 2008-03-20 Государственное образовательное учреждение высшего профессионального образования "Тихоокеанский государственный университет" Способ формирования воздушных промежутков элементами из пенополистирола
RU2341766C2 (ru) * 2006-12-01 2008-12-20 Государственное образовательное учреждение высшего профессионального образования "Тихоокеанский государственный университет" Способ формирования воздушных промежутков из пенополистирола и автономная мобильная установка для его осуществления
RU2401416C1 (ru) * 2009-07-22 2010-10-10 Сергей Михайлович Федотенко Подвесная скважинная забойка
RU2409805C1 (ru) * 2009-09-29 2011-01-20 Сергей Михайлович Федотенко Подвесная скважинная забойка
US11060832B2 (en) * 2017-03-23 2021-07-13 Pws Systems Pty Ltd Blasting method and system
RU182481U1 (ru) * 2018-06-05 2018-08-21 федеральное государственное бюджетное образовательное учреждение высшего образования "Санкт-Петербургский горный университет" Скважинная забойка

Also Published As

Publication number Publication date
ZM18768A1 (en) 1969-06-17
DE1816758A1 (de) 1969-08-21
FR1598761A (enrdf_load_stackoverflow) 1970-07-06
GB1253218A (enrdf_load_stackoverflow) 1971-11-10

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