EP3837489A1 - A primer holder device - Google Patents

A primer holder device

Info

Publication number
EP3837489A1
EP3837489A1 EP19779984.4A EP19779984A EP3837489A1 EP 3837489 A1 EP3837489 A1 EP 3837489A1 EP 19779984 A EP19779984 A EP 19779984A EP 3837489 A1 EP3837489 A1 EP 3837489A1
Authority
EP
European Patent Office
Prior art keywords
holder device
primer
distal end
booster
holder
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.)
Pending
Application number
EP19779984.4A
Other languages
German (de)
French (fr)
Inventor
Michael MCKERNAN
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP3837489A1 publication Critical patent/EP3837489A1/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D3/00—Particular applications of blasting techniques
    • F42D3/04—Particular applications of blasting techniques for rock blasting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
    • F16B13/12—Separate metal or non-separate or non-metal dowel sleeves fastened by inserting the screw, nail or the like
    • 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
    • F42B3/26—Arrangements for mounting initiators; Accessories therefor, e.g. tools
    • 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
    • F42D1/22—Methods for holding or positioning for blasting cartridges or tamping cartridges

Definitions

  • the invention relates to a holder device for holding a primer or booster device used in blasting in mines.
  • Blasting is a common technique in mining for fracturing a substrate, such as rock, to facilitate excavation and removal. Blasting involves controlled explosions, typically using shells that contain an explosive charge that is initiated by a primer or booster.
  • a primer or booster is a device for initiating an explosive and may be in the form of an explosive device that has transmission wires/ activation leads attached to initiate the explosive from a remote position. The explosive charge is primed with the primer or booster sitting in the explosive or explosive cavity region, with the transmission wires/activation leads extending up to the surface of the blast hole. The primer or booster is then fired triggering detonation of the explosive charge of the primer or booster which in turn detonates the bulk explosive.
  • a holder device for housing a primer or booster device comprising an elongate body comprising a cavity for housing at least one primer or booster device,
  • the elongate body comprising two sidewalls hingedly attached along one longitudinal side and openable along the other longitudinal side, having a circular cross-section and cylindrical in shape comprising a distal end and an open proximal end, wherein each sidewall comprises an elongate opening or slot with at least one protruding flap or wing extending from the distal end of the elongate opening or slot.
  • the elongate body comprises a snap-fit closure means along the openable longitudinal side.
  • the protruding flap is rectangular in shape.
  • the protruding flap comprises angled barbs on its outer face.
  • the protruding flap comprises a ridged surface on its inner face.
  • the inner walls of the open proximal end comprise a number of protruding ribs.
  • the base section of the open proximal end comprises a central opening.
  • the distal end of the device is rounded in shape.
  • the distal end may comprise a tapered or pointed shape.
  • the distal end comprises indents.
  • the holder device comprises a number of openings in the sidewalls.
  • the holder device is capable of accommodating a primer or booster device ranging in size from approximately 36mm to 240mm.
  • the sidewalls are approximately 3 mm to 5 mm thick.
  • the device is manufactured from a plastics material.
  • Fig. 1 is a perspective view from the front of the holder device of the invention
  • Fig. 2 is a further perspective view from the rear of the holder device of the invention.
  • Fig. 3 is an end view of the distal end of the holder device of Fig. 1;
  • Fig. 4 is an end view of the proximal end of the holder device of Fig. 1;
  • Fig. 5 is a perspective view of the outside of the holder device of Fig. 1 in its open position;
  • Fig. 6 is a perspective view of the inside side of the holder device of Fig. 1 in its open position;
  • Fig. 7 is a perspective view towards the proximal end of the device of Fig. 5 in its opened position;
  • Fig. 8 is a further perspective view from the proximal end of the device of Fig. 5 in its opened position;
  • Fig. 9 is a perspective view of the inside of the holder device of the invention with a primer or booster in position;
  • Fig. 10 is a further perspective view of the inside of the holder device of the invention with a larger sized primer or booster in position.
  • the present invention provides a holder device to contain a primer or booster device and ensure that it is safely and accurately delivered into the correct position within a blast hole resulting in a successful explosion.
  • Inserting a primer or booster device into a bore hole can be problematic. Correct positioning of the primer or booster device is essential in creating the intended blast direction/splay. It can be difficult to get them safely down a bore shaft and into the correct position without any damage to the primer or booster device as it is being inserted into a blast hole.
  • Bore holes may be drilled in various directions for example upwards, downwards or sidewards and inserting the primer or booster device into such orientated holes can be problematic. Another commonly encountered problem is that the primer or booster device gets snagged along the way as it is inserted into the drill or bore hole.
  • the holder device of the present invention overcomes the problems encountered with known devices in the mining industry comprising an explosive charge /detonator/ primer or booster.
  • the holder device 1 of the present invention comprises an elongated body having a distal end 2 and an open proximal end 3.
  • the distal end 2 is preferably rounded but may alternatively be tapered or pointed to facilitate insertion into a blast hole.
  • the elongated body is essentially circular in cross-section and is essentially cylindrical in shape to facilitate insertion and explosion in a blast hole.
  • the elongated body comprises two longitudinal sidewalls 4, 5 which are essentially identical.
  • the sidewalls 4, 5 are permanently hingedly attached along one longitudinal side with an openable closing along the other longitudinal side.
  • the openable closing comprises a snap-fit closure means 21 or any other suitable closure means.
  • the holder device 1 is opened to insert a primer or booster device 20 and then securely snapped closed.
  • the holder device comprises a cavity arranged to snugly contain at least one a primer or booster device 20 securely in position within the cavity.
  • the elongated body comprises an essentially smooth outer wall to facilitate insertion into a blast hole.
  • Each sidewall 4, 5 of the elongated body comprises an elongated opening or slot 6.
  • the distal end of the slot 6 comprises a protruding flap or wing 7.
  • the protruding flap or wing 7 is flexible and essentially spring loaded. When in an enclosed space the flap 7 lies flush against the sidewall 4, 5, however when in a wider space the flaps 7 extend outwardly from the sidewalls 4. 5.
  • the protruding flap or wing 7 comprises angled barbs 8 on its outer face.
  • the inner face of the protruding flap or wing 7 comprises a ridged surface for increased stability.
  • the flap comprises longitundinal ridges 9.
  • the angled barbs 8 provide extra grip and ensure that the holder device 1 cannot be pulled back of the blast hole once the holder device 1 is inserted into a blast hole and the flaps 7 have extended outwardly from the sidewalls 4, 5.
  • the protruding flaps or wings 7 ensure that the holder device 1 is held securely in position once inserted into a blast hole no matter what the orientation of the blast hole ie. upwards, downwards or sidewards.
  • the cavity of the holder device 1 may be adapted and sized to accommodate any length or size of primer or booster device.
  • the cavity may be sized to accommodate conventional primer or booster devices which range in length from approximately 36 mm to 240 mm.
  • the rounded distal end 2 of the primer holder 1 comprises indents 14 to strengthen the outer wall of the holder device 1.
  • the rounded distal end 2 also comprises openings 15.
  • the holder device has more openings 15 along the sidewalls 4, 5.
  • the proximal end 3 of the holder device 1 is open ended and comprises receiving means for receiving a hose pipe.
  • the inner walls of the proximal end 3 comprise a number of protruding ribs 11 to securely engage with a hose pipe delivering liquid explosive to the holder device 1.
  • the protruding ribs 11 may be sized and shaped to accommodate differently sized hose pipes.
  • the base section 12 of the proximal end of the device 1 comprises an opening 13. In use the holder device 1 is opened and a primer or booster device 20 inserted into the cavity. The side walls 4, 5 of the holder device 1 are then snapped closed.
  • Activation leads or transmission wires (not shown) embedded within the primer or booster device 20 extend through the opening 13 in the proximal end 3 of the holder device 1.
  • a hose is attached to the proximal end 3 of the holder device 1 and the device 1 with the activation leads and hose extending therefrom is inserted into a blast hole.
  • the protruding flaps or wings 7 expand outwards securing the holder device 1 in position within the blast hole.
  • liquid explosive is pumped through the hose filling the cavity of the holder device 1 around the primer or booster device 20 and pouring out through the openings 15 and the elongated slots 6 to surround the holder device 1 within the blast hole with liquid explosive.
  • the hose is then retracted, the activation leads or transmission wires attached to a detonator/activator at a remote distance to the blast hole and the primer or booster device 20 within the holder device 1 is detonated.
  • the design of the holder device of the present invention significantly reduces the chance of a misfire or the incorrect positioning of a primer or booster device within a bore hole. Misfires are a significant safety and financial risk.
  • the primer or booster holder device 1 of the present invention is manufactured from a durable material preferably a plastics material.
  • the material is strong enough to safely encase a primer or booster device and withstand insertion into a blast hole.
  • the plastics material is lightweight yet durable.
  • the sidewalls of the holder device are approximately 3-5mm in thickness.
  • the holder device is designed to withstand pressures greater than 10 MPa and up to

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)

Abstract

A holder device (1) for housing a primer or booster device comprises an elongate body comprising a cavity for housing at least one primer or booster device, the elongate comprising two sidewalls (4, 5) hingedly attached along one longitudinal side and openable along the other longitudinal side, having a circular cross-section and cylindrical in shape comprising a distal end (2) and an open proximal end (3), wherein each sidewall comprises an elongate opening or slot with at least one protruding flap or wing extending from the distal end of the elongate opening or slot.

Description

“A Primer Holder Device”
Introduction
The invention relates to a holder device for holding a primer or booster device used in blasting in mines.
Blasting is a common technique in mining for fracturing a substrate, such as rock, to facilitate excavation and removal. Blasting involves controlled explosions, typically using shells that contain an explosive charge that is initiated by a primer or booster. A primer or booster is a device for initiating an explosive and may be in the form of an explosive device that has transmission wires/ activation leads attached to initiate the explosive from a remote position. The explosive charge is primed with the primer or booster sitting in the explosive or explosive cavity region, with the transmission wires/activation leads extending up to the surface of the blast hole. The primer or booster is then fired triggering detonation of the explosive charge of the primer or booster which in turn detonates the bulk explosive.
Inserting the primer or booster and positioning it in its optimum position for a successful blast can be very problematic with non-detonation or misfiring occurring sometimes.
There is a need for an improved device to ensure that a primer or booster device are always placed securely and correctly in their optimum position.
Statements of Invention
According to the invention there is provided a holder device for housing a primer or booster device comprising an elongate body comprising a cavity for housing at least one primer or booster device,
the elongate body comprising two sidewalls hingedly attached along one longitudinal side and openable along the other longitudinal side, having a circular cross-section and cylindrical in shape comprising a distal end and an open proximal end, wherein each sidewall comprises an elongate opening or slot with at least one protruding flap or wing extending from the distal end of the elongate opening or slot.
In one embodiment of the invention the elongate body comprises a snap-fit closure means along the openable longitudinal side.
In one embodiment of the invention the protruding flap is rectangular in shape. Preferably the protruding flap comprises angled barbs on its outer face. Most preferably the protruding flap comprises a ridged surface on its inner face.
In one embodiment of the invention the inner walls of the open proximal end comprise a number of protruding ribs.
In one embodiment of the invention the base section of the open proximal end comprises a central opening.
In another embodiment of the invention the distal end of the device is rounded in shape. Alternatively the distal end may comprise a tapered or pointed shape.
In one embodiment of the invention the distal end comprises indents.
In another embodiment of the invention the holder device comprises a number of openings in the sidewalls.
In one embodiment of the invention the holder device is capable of accommodating a primer or booster device ranging in size from approximately 36mm to 240mm.
In another embodiment of the invention the sidewalls are approximately 3 mm to 5 mm thick. Preferably the device is manufactured from a plastics material. Brief Description of the Invention
The invention will be more clearly understood from the following description thereof with reference to the accompanying drawings in which: -
Fig. 1 is a perspective view from the front of the holder device of the invention;
Fig. 2 is a further perspective view from the rear of the holder device of the invention;
Fig. 3 is an end view of the distal end of the holder device of Fig. 1;
Fig. 4 is an end view of the proximal end of the holder device of Fig. 1;
Fig. 5 is a perspective view of the outside of the holder device of Fig. 1 in its open position;
Fig. 6 is a perspective view of the inside side of the holder device of Fig. 1 in its open position;
Fig. 7 is a perspective view towards the proximal end of the device of Fig. 5 in its opened position;
Fig. 8 is a further perspective view from the proximal end of the device of Fig. 5 in its opened position;
Fig. 9 is a perspective view of the inside of the holder device of the invention with a primer or booster in position; and
Fig. 10 is a further perspective view of the inside of the holder device of the invention with a larger sized primer or booster in position.
Detailed description The present invention provides a holder device to contain a primer or booster device and ensure that it is safely and accurately delivered into the correct position within a blast hole resulting in a successful explosion.
Inserting a primer or booster device into a bore hole can be problematic. Correct positioning of the primer or booster device is essential in creating the intended blast direction/splay. It can be difficult to get them safely down a bore shaft and into the correct position without any damage to the primer or booster device as it is being inserted into a blast hole.
Bore holes may be drilled in various directions for example upwards, downwards or sidewards and inserting the primer or booster device into such orientated holes can be problematic. Another commonly encountered problem is that the primer or booster device gets snagged along the way as it is inserted into the drill or bore hole.
The holder device of the present invention overcomes the problems encountered with known devices in the mining industry comprising an explosive charge /detonator/ primer or booster.
The holder device 1 of the present invention comprises an elongated body having a distal end 2 and an open proximal end 3. The distal end 2 is preferably rounded but may alternatively be tapered or pointed to facilitate insertion into a blast hole. The elongated body is essentially circular in cross-section and is essentially cylindrical in shape to facilitate insertion and explosion in a blast hole.
The elongated body comprises two longitudinal sidewalls 4, 5 which are essentially identical. The sidewalls 4, 5 are permanently hingedly attached along one longitudinal side with an openable closing along the other longitudinal side. The openable closing comprises a snap-fit closure means 21 or any other suitable closure means.
The holder device 1 is opened to insert a primer or booster device 20 and then securely snapped closed. The holder device comprises a cavity arranged to snugly contain at least one a primer or booster device 20 securely in position within the cavity. The elongated body comprises an essentially smooth outer wall to facilitate insertion into a blast hole.
Each sidewall 4, 5 of the elongated body comprises an elongated opening or slot 6. The distal end of the slot 6 comprises a protruding flap or wing 7. The protruding flap or wing 7 is flexible and essentially spring loaded. When in an enclosed space the flap 7 lies flush against the sidewall 4, 5, however when in a wider space the flaps 7 extend outwardly from the sidewalls 4. 5. The protruding flap or wing 7 comprises angled barbs 8 on its outer face. The inner face of the protruding flap or wing 7 comprises a ridged surface for increased stability. Preferably the flap comprises longitundinal ridges 9. The angled barbs 8 provide extra grip and ensure that the holder device 1 cannot be pulled back of the blast hole once the holder device 1 is inserted into a blast hole and the flaps 7 have extended outwardly from the sidewalls 4, 5. The protruding flaps or wings 7 ensure that the holder device 1 is held securely in position once inserted into a blast hole no matter what the orientation of the blast hole ie. upwards, downwards or sidewards.
The cavity of the holder device 1 may be adapted and sized to accommodate any length or size of primer or booster device. For example the cavity may be sized to accommodate conventional primer or booster devices which range in length from approximately 36 mm to 240 mm.
The rounded distal end 2 of the primer holder 1 comprises indents 14 to strengthen the outer wall of the holder device 1. The rounded distal end 2 also comprises openings 15. The holder device has more openings 15 along the sidewalls 4, 5.
The proximal end 3 of the holder device 1 is open ended and comprises receiving means for receiving a hose pipe. The inner walls of the proximal end 3 comprise a number of protruding ribs 11 to securely engage with a hose pipe delivering liquid explosive to the holder device 1. The protruding ribs 11 may be sized and shaped to accommodate differently sized hose pipes. The base section 12 of the proximal end of the device 1 comprises an opening 13. In use the holder device 1 is opened and a primer or booster device 20 inserted into the cavity. The side walls 4, 5 of the holder device 1 are then snapped closed. Activation leads or transmission wires (not shown) embedded within the primer or booster device 20 extend through the opening 13 in the proximal end 3 of the holder device 1. A hose is attached to the proximal end 3 of the holder device 1 and the device 1 with the activation leads and hose extending therefrom is inserted into a blast hole.
Once in position within a blast hole the protruding flaps or wings 7 expand outwards securing the holder device 1 in position within the blast hole. Once securely in position liquid explosive is pumped through the hose filling the cavity of the holder device 1 around the primer or booster device 20 and pouring out through the openings 15 and the elongated slots 6 to surround the holder device 1 within the blast hole with liquid explosive. The hose is then retracted, the activation leads or transmission wires attached to a detonator/activator at a remote distance to the blast hole and the primer or booster device 20 within the holder device 1 is detonated.
The design of the holder device of the present invention significantly reduces the chance of a misfire or the incorrect positioning of a primer or booster device within a bore hole. Misfires are a significant safety and financial risk.
The primer or booster holder device 1 of the present invention is manufactured from a durable material preferably a plastics material. The material is strong enough to safely encase a primer or booster device and withstand insertion into a blast hole. The plastics material is lightweight yet durable.
The sidewalls of the holder device are approximately 3-5mm in thickness. The holder device is designed to withstand pressures greater than 10 MPa and up to
approximately 40 MPa.
The invention is not limited to the embodiment hereinbefore described, with reference to the accompanying drawings, which may be varied in construction and detail.

Claims

Claims
1. A holder device for housing a primer or booster device comprising an elongate body comprising a cavity for housing at least one primer or booster device,
the elongate body comprising two sidewalls hingedly attached along one longitudinal side and openable along the other longitudinal side, the elongate body having a circular cross-section and cylindrical in shape comprising a distal end and an open proximal end, wherein each sidewall comprises an elongate opening or slot with at least one protruding flap or wing extending from the distal end of the elongate opening or slot.
2. A holder device as claimed in claim 1 wherein the elongate body comprises a snap-fit closure means along the openable longitudinal side.
3. A holder device as claimed in any preceding claim wherein the protruding flap is rectangular in shape.
4. A holder device as claimed in any preceding claim wherein the protruding flap comprises angled barbs on its outer face.
5. A holder device as claimed in any preceding claim wherein the protruding flap comprises a ridged surface on its inner face.
6. A holder device as claimed in any preceding claim wherein the inner walls of the open proximal end comprise a number of protruding ribs.
7. A holder device as claimed in any preceding claim wherein the base section of the open proximal end comprises a central opening.
8. A holder device as claimed in any preceding claim wherein the distal end of the device is rounded in shape.
9. A holder device as claimed in any preceding claim wherein the distal end comprises a tapered or pointed shape.
10. A holder device as claimed in any preceding claim wherein the distal end comprises indents.
11. A holder device as claimed in any preceding claim comprising a number of openings in the sidewalls.
12. A holder device as claimed in any preceding claim capable of accommodating a primer or booster device ranging in size from 36mm to 240mm.
13. A holder device as claimed in any preceding claim wherein the sidewalls are approximately 3 mm to 5 mm thick.
14. A holder device as claimed in any preceding claim manufactured from a plastics material.
EP19779984.4A 2018-08-18 2019-08-19 A primer holder device Pending EP3837489A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB1813483.3A GB201813483D0 (en) 2018-08-18 2018-08-18 A primer holder device
PCT/IB2019/056987 WO2020039332A1 (en) 2018-08-18 2019-08-19 A primer holder device

Publications (1)

Publication Number Publication Date
EP3837489A1 true EP3837489A1 (en) 2021-06-23

Family

ID=63668072

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19779984.4A Pending EP3837489A1 (en) 2018-08-18 2019-08-19 A primer holder device

Country Status (4)

Country Link
EP (1) EP3837489A1 (en)
GB (2) GB201813483D0 (en)
IE (1) IE87238B1 (en)
WO (1) WO2020039332A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE546002C2 (en) * 2020-10-22 2024-04-09 Luossavaara Kiirunavaara Ab A blasting system and a method of explosive material charging
SE546026C2 (en) * 2020-10-22 2024-04-16 Luossavaara Kiirunavaara Ab Detonator support device and method of charging a blasthole

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2491692A (en) * 1945-11-08 1949-12-20 Edwin J Shimek Borehole explosive charge
US2529763A (en) * 1946-11-22 1950-11-14 Lloyd R Deputy Geophysical safety catch
US2687092A (en) * 1951-02-26 1954-08-24 Bert F Duesing Protective device for blasting cartridges
JPS5540480Y2 (en) * 1977-02-07 1980-09-20
JPS608700A (en) * 1983-06-27 1985-01-17 重光　啓助 Cobbing blasting method in same pit
DE3613624A1 (en) * 1986-04-23 1987-10-29 Dynamit Nobel Ag PYROTECHNICAL DOWEL
SE507621C2 (en) * 1991-02-18 1998-06-29 Nitro Nobel Ab Coupling blocks for ignition devices
AU785047B2 (en) * 2001-03-05 2006-09-07 Orica Explosives Technology Pty Ltd Explosive casing
WO2016001850A1 (en) * 2014-07-02 2016-01-07 Orica International Pte Ltd A shell for use in blasting

Also Published As

Publication number Publication date
IE87238B1 (en) 2021-06-23
GB2577798B (en) 2020-09-23
GB201813483D0 (en) 2018-10-03
GB2577798A (en) 2020-04-08
IE20190141A1 (en) 2020-07-08
GB201911890D0 (en) 2019-10-02
WO2020039332A1 (en) 2020-02-27

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