WO2011001205A1 - Blast hole plugging apparatus - Google Patents
Blast hole plugging apparatus Download PDFInfo
- Publication number
- WO2011001205A1 WO2011001205A1 PCT/IB2009/052797 IB2009052797W WO2011001205A1 WO 2011001205 A1 WO2011001205 A1 WO 2011001205A1 IB 2009052797 W IB2009052797 W IB 2009052797W WO 2011001205 A1 WO2011001205 A1 WO 2011001205A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- platform
- hole
- wall
- central region
- locking member
- Prior art date
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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 apparatus for plugging a hole.
- explosive charges are inserted into boreholes drilled into rock or other material to be mined. It is important to locate the explosive charges at the correct depths in the boreholes. In many cases, use is made of stemming material which is held in place over the explosive charges at a suitable height, to modify the effect of the explosives as required.
- VVO 2009/037529 describes blast hole plugging apparatus that can be used to support explosives, stemming or other material in a borehole and which can be located at a desired depth in such a hole.
- apparatus for plugging a hole comprising: a platform shaped to fit within the hole and to support material at a desired depth in the hole, the platform defining a central load support region and a peripheral region for engaging the wall of the hole, the peripheral region of the platform comprising an upstanding wall or skirt that extends substantially parallel to the wall of the hole when the apparatus is seated in the hole; a locking member attached movably to the platform and moveable between a first position in which it is supported clear of the wall of the hole below the platform, and a second position in which it spans the hole to lock the platform in position in the hole; and an elongated actuating member connected to the locking member and platform for lowering the apparatus into the hole and for moving the locking member between the first and second positions thereof, characterised in that the platform comprises a central region and a pair of side regions defined on either side of the central region and connected hingedly to the central region, so that the platform can be folded along the hinges between a relatively compact storage state and an er
- the platform may take the form of a plate or tray which is generally elliptical or ellipsoidal in shape so that it fits snugly within the hole when inclined transversely relative to a longitudinal axis of the hole.
- the ratio of the length of the platform to its width is preferably chosen so that when the platform is located correctly in a borehole of circular section in use, at a predetermined angle to the axis of the borehole, substantially the entire upstanding wall of the platform contacts the borehole wall.
- the upstanding wall of the platform is preferably of a substantially uniform height around the periphery of the platform.
- the upstanding wall is formed with slots running between the periphery of the platform and the free edges of the wall, so that the wall is divided into a plurality of sections.
- the wall is divided into four sections, a respective side wall section being attached to each side region of the platform, and respective end wall sections being attached to opposed ends of the central region of the platform.
- the platform is preferably formed such that at least the side regions and the respective adjacent upstanding wall portions thereof are biased towards the compact storage state of the platform.
- the side regions preferably each define an obtuse angle with the central region.
- the angle may be in the range 100 to 170 degrees, and is preferably in the range 120 to 150 degrees.
- the end wall sections are preferably formed so that a first of the end wall sections defines an acute angle with the central region of the platform, and so that a second of the end wall sections defines an obtuse angle with the centra) region of the platform in the compact storage state of the platform.
- the platform is moulded from a suitable plastics material, such as high- or low-density polyethylene, or polypropylene.
- a suitable plastics material such as high- or low-density polyethylene, or polypropylene.
- Figure 1 is a pictorial view from above of an embodiment of apparatus for plugging a hole according to the invention
- Figure 2 is a pictorial view from below of the apparatus shown in
- Figure 1 Figure 3 is a perspective view of a platform of the apparatus of Figures 1 and 2 in a compact, storage state thereof;
- FIGS 1 and 2 show an embodiment of apparatus for plugging a hole according to the invention, comprising a platform 10 and a locking member 12.
- the platform 10 is moulded from a tough plastics material such as high or low density polyethylene or polypropylene and comprises a generally planar central region 14 with generally planar side regions 16 and 18 on either side thereof.
- the central region 14 and the side regions 16 together define a platform having an ellipsoidal or, preferably, an elliptical shape.
- the platform can be manufactured from other materials, including other plastics such as PVC, glass fibre and resin, or even sheet metal such as stamped aluminium sheet.
- the central region 14 defines a long axis of the platform. Extending parallel to the long axis and separating the central region 14 from the side regions 16 and 18 are integrally formed hinges 28 and 30 which allow the side regions to fold relative to the central region.
- the hinges are typically formed in a moulding process by which the platform is produced, and can comprise grooves or narrow strips of reduced thickness, or can have a curved profile, such as a semi-circular profile, to facilitate a hinge action.
- each side region 16 and 18 was approximately 30% of the overall width of the central region 14.
- Formed integrally with the platform 10 is an upstanding peripheral wall or skirt comprising wall sections 20, 22, 24 and 26.
- the wall sections 20 and 22 are contiguous with outer edges of the side regions 16 and 18 of the platform, respectively, while the wall sections 24 and 26 are contiguous with respective opposed ends of the central region 14.
- the upstanding peripheral wall or skirt is generally cylindrical in shape when in an erect, operative configuration, with the axis of the cylinder being inclined at approximately 45 ° relative to the plane of central region 14 of the load support platform.
- the height of the peripheral wall or skirt is preferably substantially constant at different positions around the periphery of the platform.
- the wall sections are formed separately so that they can move independently relative to one another.
- the wall sections When in their erected, operative positions, as shown in Figures 1 and 2, the wall sections define a shape corresponding to the elliptical shape of the platform, so that when the platform is seated in a bore hole of the correct diameter, at a predetermined angle (in this embodiment, approximately 45°) the periphery of the platform and the outer surfaces of the wall sections are in contact with the bore hole wall over substantially their entire surface.
- narrow upright slots 32 separate the adjacent edges of the wall sections.
- the slots 32 are preferably formed in the moulding operation by means of which the platform is produced, so that the entire platform can be produced in a single moulding operation.
- the side regions 16 and 18 of the platform are tipped up somewhat, each defining an obtuse angle relative to the central region 14.
- the angle may be in the range 100° to 170°, and is preferably in the range 120° to 150°. Typically, the angle would be approximately 135°.
- the wall portions 20 and 22 attached to the side regions 16 and 18 curl inwardly as shown, while the end wall portion 26 defines an acute angle with the central portion 14 of the platform of approximately 45°, and the end wall portion 24 defines an obtuse angle with the central portion 14 of the platform of approximately 135°.
- the platform has, in this configuration, a more compact shape than when fully erected, allowing it to be lowered into a bore hole with less chance of snagging against the wall of the bore hole than a platform without the described folding regions.
- the planar portion of the platform comprising the central region 14 and the adjacent side regions 16 and 18 is designed to carry a load of material, which could be explosives or stemming material in a typical application.
- the central region includes a large stiffening rib or ridge 34 which is aligned with the longitudinal axis of the central region 14.
- the ridge 34 defines a cavity 36 of semi-circular section within the central region 14 of the platform, in which the locking member 12 can be received in a storage configuration of the apparatus.
- An opening 38 is formed in the wall section 26, at an open end of the cavity 36, in which one end 40 of the locking member 12 is received.
- the locking member 12 comprises a length of rigid PVC pipe.
- Other suitably strong and rigid materials such as ABS are also suitable.
- the free end of the locking member is fitted with a gripping foot 42 of relatively resilient material, to enhance engagement of the locking member with the wall of the bore hole in use.
- a pair of opposed apertures are formed in the end 40 of the locking member which receive respective pins 44 formed in the central region 14 of the platform at the outer end 38 of the cavity 36 to mount the locking member pivotably on the platform.
- the pins could be formed on the end of the locking member and be received in apertures or slots in the platform, instead.
- the free end 42 of the locking member hangs below the platform in use, with one end of a line or cord 48 secured to it.
- the line or cord has an elastic or frangible coupling element 46 at its end, by means of which the line is secured to the locking member.
- the coupling element 46 can be, for example, an O-ring or elastic band, or a length of thinner or weaker line. When sufficient force is exerted on the line, the coupling element 46 snaps or breaks.
- the line or cord 48 passes through a keyhole shaped aperture 50 in an inner end portion of the stiffening rib 34, so that the entire apparatus can be raised or lowered at the end of the cord or line 48, the position of the foot 42 of the locking member being determined by the length of a portion of the line between the locking member and the underside of the platform.
- the apparatus can be lowered into a borehole 52, with the underside of the platform and the locking member defining an oblique angle between one another, or preferably an angle of 180 ° , so that the apparatus does not snag the wall 54 of the borehole.
- the platform is located in the borehole, with the ends of the central region 14 of the platform and the respective wall portions 24 and 26 in contact with the wall of the borehole, but with the side regions 16 and 18 and their respective wall portions 20 and 22 still curled inwardly somewhat over the central region (see Figure 3).
- the force exerted by the material tends to act on the side portions 16 and 18 of the platform and to cause them to hinge downwardly until they are substantially coplanar with the central region 14.
- the corresponding inwardly curled wall portions 20 and 22 are forced outwardly into contact with the wall of the borehole.
- the weight of the material increases the wedging force on the platform and the locking member, holding the platform securely in position in the borehole and allowing a substantial load to be carried by the platform in use.
- the height of the wall sections is sufficient to engage the wall of the bore hole when the platform is loaded, preventing slipping or collapsing of the platform in use.
- the platform of the described apparatus is a single moulded component which is lowered into a bore hole in a compact state but which is readily locked in position in the bore hole, and which deploys automatically to the correct operative configuration when loaded in use.
- the cord or line 48 is no longer needed, and can be removed as mentioned above.
- other known apparatus that can support a load of explosives or stemming on a platform requires the support of a cord tied to a brace at the top of the bore hole.
- the described apparatus is simple and inexpensive to manufacture, but effective in use. Unlike apparatus having an inflatable body which wedges itself in the borehole when sufficiently inflated, the described apparatus can be used in water-filled holes, making it relatively versatile.
- the load on the platform of the apparatus is transferred to the lowest point thereof, where the platform connects pivotably to the locking member.
- This is achieved by arranging the platform at an angle relative to the axis of the blast hole. This arrangement causes stemming supported by the platform to be tapered in a wedge shape, which enhances the effect of the stemming in use.
- the cord can conveniently be passed through one of the slots 32 between adjacent wall sections of the platform, which serves to locate the detonator cord and keep it from being cut or pinched by the locking member 12 when the latter is swung into position.
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
Abstract
Apparatus for plugging a hole, such as borehole used in blasting, comprises a platform shaped to fit within the hole and to support material at a desired depth in the hole. The platform defines a central load support region and a peripheral region for engaging the wall of the hole. The peripheral region of the platform comprises an upstanding wall that extends substantially parallel to the wall of the hole when the apparatus is seated in the hole. The platform comprises a central region and a pair of side regions either side of the central region, which are connected hingedly to the central region. This allows the platform to be folded along the hinges between a relatively compact storage state and an erected operative state in which the side regions are substantially coplanar with the central region of the platform. A locking member is attached movably to the platform and is moveable between a first position in which it is supported clear of the wall of the hole below the platform, and a second position in which it spans the hole to lock the platform in position in the hole. An elongated actuating member is connected to the locking member and platform for lowering the apparatus into the hole and for moving the locking member between the first and second positions.
Description
BLAST HOLE PLUGGING APPARATUS
BACKGROUND OF THE INVENTION
THIS invention relates to apparatus for plugging a hole.
In blasting operations, for example in mining applications, explosive charges are inserted into boreholes drilled into rock or other material to be mined. It is important to locate the explosive charges at the correct depths in the boreholes. In many cases, use is made of stemming material which is held in place over the explosive charges at a suitable height, to modify the effect of the explosives as required.
International patent publication no. VVO 2009/037529 describes blast hole plugging apparatus that can be used to support explosives, stemming or other material in a borehole and which can be located at a desired depth in such a hole.
SUMMARY OF THE INVENTION
According to the invention there is provided apparatus for plugging a hole, the apparatus comprising: a platform shaped to fit within the hole and to support material at a desired depth in the hole, the platform defining a central load support region and a peripheral region for engaging the wall of the hole, the peripheral region of the platform comprising an upstanding wall or skirt that extends substantially parallel to the wall of the hole when the apparatus is seated in the hole;
a locking member attached movably to the platform and moveable between a first position in which it is supported clear of the wall of the hole below the platform, and a second position in which it spans the hole to lock the platform in position in the hole; and an elongated actuating member connected to the locking member and platform for lowering the apparatus into the hole and for moving the locking member between the first and second positions thereof, characterised in that the platform comprises a central region and a pair of side regions defined on either side of the central region and connected hingedly to the central region, so that the platform can be folded along the hinges between a relatively compact storage state and an erected operative state in which the side regions are substantially coplanar with the central region of the platform.
The platform may take the form of a plate or tray which is generally elliptical or ellipsoidal in shape so that it fits snugly within the hole when inclined transversely relative to a longitudinal axis of the hole.
The ratio of the length of the platform to its width is preferably chosen so that when the platform is located correctly in a borehole of circular section in use, at a predetermined angle to the axis of the borehole, substantially the entire upstanding wall of the platform contacts the borehole wall.
The upstanding wall of the platform is preferably of a substantially uniform height around the periphery of the platform.
In a preferred embodiment, the upstanding wall is formed with slots running between the periphery of the platform and the free edges of the wall, so that the wall is divided into a plurality of sections.
Preferably, the wall is divided into four sections, a respective side wall section being attached to each side region of the platform, and respective end wall sections being attached to opposed ends of the central region of the platform.
The platform is preferably formed such that at least the side regions and the respective adjacent upstanding wall portions thereof are biased towards the compact storage state of the platform.
In the compact storage state of the platform, the side regions preferably each define an obtuse angle with the central region.
For example, the angle may be in the range 100 to 170 degrees, and is preferably in the range 120 to 150 degrees.
The end wall sections are preferably formed so that a first of the end wall sections defines an acute angle with the central region of the platform, and so that a second of the end wall sections defines an obtuse angle with the centra) region of the platform in the compact storage state of the platform.
Preferably, the platform is moulded from a suitable plastics material, such as high- or low-density polyethylene, or polypropylene.
Other materials could be used instead, such as glass fibre and resin, sheet metal, or other plastics materials with suitable characteristics.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a pictorial view from above of an embodiment of apparatus for plugging a hole according to the invention;
Figure 2 is a pictorial view from below of the apparatus shown in
Figure 1 ;
Figure 3 is a perspective view of a platform of the apparatus of Figures 1 and 2 in a compact, storage state thereof; and
Figures 4,
5 and 6 are schematic side views showing the apparatus of Figured
1 and 2 in a borehole, in use.
DESCRIPTION OF AN EMBODIMENT
Figures 1 and 2 show an embodiment of apparatus for plugging a hole according to the invention, comprising a platform 10 and a locking member 12. The platform 10 is moulded from a tough plastics material such as high or low density polyethylene or polypropylene and comprises a generally planar central region 14 with generally planar side regions 16 and 18 on either side thereof. The central region 14 and the side regions 16 together define a platform having an ellipsoidal or, preferably, an elliptical shape.
Although polyethylene or polypropylene is preferred as the material from which the platform is moulded, the platform can be manufactured from other materials, including other plastics such as PVC, glass fibre and resin, or even sheet metal such as stamped aluminium sheet.
The central region 14 defines a long axis of the platform. Extending parallel to the long axis and separating the central region 14 from the side regions 16 and 18 are integrally formed hinges 28 and 30 which allow the side regions to fold relative to the central region. The hinges are typically formed in a moulding process by which the platform is produced, and can comprise grooves or narrow strips of reduced thickness, or can have a curved profile, such as a semi-circular profile, to facilitate a hinge action.
In a prototype of the illustrated embodiment, the maximum width of each side region 16 and 18 was approximately 30% of the overall width of the central region 14.
Formed integrally with the platform 10 is an upstanding peripheral wall or skirt comprising wall sections 20, 22, 24 and 26. The wall sections 20 and 22 are contiguous with outer edges of the side regions 16 and 18 of the platform, respectively, while the wall sections 24 and 26 are contiguous with respective opposed ends of the central region 14.
The upstanding peripheral wall or skirt is generally cylindrical in shape when in an erect, operative configuration, with the axis of the cylinder being inclined at approximately 45° relative to the plane of central region 14 of the load support platform. The height of the peripheral wall or skirt is preferably substantially constant at different positions around the periphery of the platform.
The wall sections are formed separately so that they can move independently relative to one another. When in their erected, operative positions, as shown in Figures 1 and 2, the wall sections define a shape corresponding to the elliptical shape of the platform, so that when the platform is seated in a bore hole of the correct diameter, at a predetermined angle (in this embodiment, approximately 45°) the periphery of the platform and the outer surfaces of the wall sections are in contact with the bore hole wall over substantially their entire surface. In this operative configuration, narrow upright slots 32 separate the adjacent edges of the wall sections. The slots 32 are preferably formed in the moulding operation by means of which the platform is produced, so that the entire platform can be produced in a single moulding operation.
As best seen in Figure 3, when the platform is in a non-operative storage state, the side regions 16 and 18 of the platform are tipped up somewhat, each defining an obtuse angle relative to the central region 14. For example, the angle may be in the range 100° to 170°, and is preferably in the range 120° to 150°. Typically, the angle would be approximately 135°.
In addition, the wall portions 20 and 22 attached to the side regions 16 and 18 curl inwardly as shown, while the end wall portion 26 defines an acute angle with the central portion 14 of the platform of approximately 45°, and the end wall portion 24 defines an obtuse angle with the central portion 14 of the platform of approximately 135°.
The result is that the platform has, in this configuration, a more compact shape than when fully erected, allowing it to be lowered into a bore hole with less chance of snagging against the wall of the bore hole than a platform without the described folding regions.
The planar portion of the platform comprising the central region 14 and the adjacent side regions 16 and 18 is designed to carry a load of material, which could be explosives or stemming material in a typical application. The central region includes a large stiffening rib or ridge 34 which is aligned with the longitudinal axis of the central region 14. The ridge 34 defines a cavity 36 of semi-circular section within the central region 14 of the platform, in which the locking member 12 can be received in a storage configuration of the apparatus.
An opening 38 is formed in the wall section 26, at an open end of the cavity 36, in which one end 40 of the locking member 12 is received. Typically, the locking member 12 comprises a length of rigid PVC pipe. Other suitably strong and rigid materials such as ABS are also suitable. The free end of the locking member is fitted with a gripping foot 42 of relatively resilient material, to enhance engagement of the locking member with the wall of the bore hole in use.
A pair of opposed apertures are formed in the end 40 of the locking member which receive respective pins 44 formed in the central region 14 of the platform at the outer end 38 of the cavity 36 to mount the locking member pivotably on the platform. The pins could be formed on the end of the locking member and be received in apertures or slots in the platform, instead.
The free end 42 of the locking member hangs below the platform in use, with one end of a line or cord 48 secured to it. The line or cord has an elastic or frangible coupling element 46 at its end, by means of which the line is secured to the locking member. The coupling element 46 can be, for example, an O-ring or elastic band, or a length of thinner or weaker line. When sufficient force is exerted on the line, the coupling element 46 snaps or breaks. The line or cord 48 passes through a keyhole shaped aperture 50 in an inner end portion of the stiffening rib 34, so that the entire apparatus can be raised or lowered at the end of the cord or line 48, the position of the foot 42 of the locking member being determined by the length of a portion of the line between the locking member and the underside of the platform.
In this configuration, as shown in Figure 4, the apparatus can be lowered into a borehole 52, with the underside of the platform and the locking member defining an oblique angle between one another, or preferably an angle of 180°, so that the apparatus does not snag the wall 54 of the borehole.
When the apparatus is at the correct depth in the borehole, a sharp upward jerk on the cord or line 48 releases the line from the keyhole shaped aperture, allowing the line to pass freely through the aperture in the platform. This allows the lower end of the locking member to swing upwardly as illustrated in Figure 5, while the angled cylindrical shape of the platform allows it to come to rest in the borehole in the position shown in Figure 5. This locks or wedges the platform and the locking member in position in the borehole, and positions the platform above the locking point at an angle of about 45° relative to the axis of the borehole. It is important that the platform be at an angle to ensure that the load is on the locking point and not on the opposite side, as that would cause the locking member to dislodge and the load to slip downward in use.
By pulling or jerking the cord or line 48 hard enough to snap the coupling element 46, the user is assured that the locking member has been swung into position with sufficient force to engage properly, and also allows the cord or line to be removed from the bore hole.
At this point, the platform is located in the borehole, with the ends of the central region 14 of the platform and the respective wall portions 24 and 26 in contact with the wall of the borehole, but with the side regions 16 and 18 and their respective wall portions 20 and 22 still curled inwardly somewhat over the central region (see Figure 3).
If stemming, explosives or other material are now placed on the platform, the force exerted by the material tends to act on the side portions 16 and 18 of the platform and to cause them to hinge downwardly until they are substantially coplanar with the central region 14. At the same time, the corresponding inwardly curled wall portions 20 and 22 are forced outwardly into contact with the wall of the borehole. The weight of the material increases the wedging force on the platform and the locking member, holding the platform securely in position in the borehole and allowing a substantial load to be carried by the platform in use. The height of the wall sections is sufficient to engage the wall of the bore hole when the platform is loaded, preventing slipping or collapsing of the platform in use.
Thus, it can be noted that the platform of the described apparatus is a single moulded component which is lowered into a bore hole in a compact state but which is readily locked in position in the bore hole, and which deploys automatically to the correct operative configuration when loaded in use.
Once the apparatus is wedged in place, the cord or line 48 is no longer needed, and can be removed as mentioned above. By contrast, other known apparatus that can support a load of explosives or stemming on a platform requires the support of a cord tied to a brace at the top of the bore hole.
The described apparatus is simple and inexpensive to manufacture, but effective in use. Unlike apparatus having an inflatable body which wedges itself in the borehole when sufficiently inflated, the described apparatus can be used in water-filled holes, making it relatively versatile.
In operation, the load on the platform of the apparatus is transferred to the lowest point thereof, where the platform connects pivotably to the locking member. This is achieved by arranging the platform at an angle relative to the axis of the blast hole. This arrangement causes stemming supported by the platform to be tapered in a wedge shape, which enhances the effect of the stemming in use.
In some applications where a detonator cord is lowered into a borehole with the apparatus, the cord can conveniently be passed through one of the slots 32 between adjacent wall sections of the platform, which serves to locate the detonator cord and keep it from being cut or pinched by the locking member 12 when the latter is swung into position.
Claims
1. Apparatus for plugging a hole, the apparatus comprising: a platform shaped to fit within the hole and to support material at a desired depth in the hole, the platform defining a central load support region and a peripheral region for engaging the wall of the hole, the peripheral region of the platform comprising an upstanding wall that extends substantially parallel to the wall of the hole when the apparatus is seated in the hole; a locking member attached movably to the platform and moveable between a first position in which it is supported clear of the wall of the hole below the platform, and a second position in which it spans the hole to lock the platform in position in the hole; and an elongated actuating member connected to the locking member and platform for lowering the apparatus into the hole and for moving the locking member between the first and second positions thereof, characterised in that the platform comprises a central region and a pair of side regions defined on either side of the central region and connected hingedly to the central region, so that the platform can be folded along the hinges between a relatively compact storage state and an erected operative state in which the side regions are substantially coplanar with the central region of the platform.
2. Apparatus according to claim 1 wherein the platform takes the form of a plate or tray which is generally elliptical or ellipsoidal in shape so that it fits snugly within the hole when inclined transversely relative to a longitudinal axis of the hole.
3. Apparatus according to claim 2 wherein the ratio of the length of the platform to its width is chosen so that when the platform is located correctly in a borehole of circular section in use, at a predetermined angle to the axis of the borehole, substantially the entire upstanding wall of the platform contacts the borehole wall.
4. Apparatus according to any one of claims 1 to 3 wherein the upstanding wall of the platform is of a substantially uniform height around the periphery of the platform.
5. Apparatus according to any one of claims 1 to 4 wherein the upstanding wall is formed with slots running between the periphery of the platform and the free edges of the wall, so that the wall is divided into a plurality of sections.
6. Apparatus according to claim 5 wherein the wall is divided into four sections, a respective side wall section being attached to each side region of the platform, and respective end wall sections being attached to opposed ends of the central region of the platform.
7. Apparatus according to claim 6 wherein the platform is formed such that at least the side regions and the respective adjacent upstanding wall portions thereof are biased towards the compact storage state of the platform.
8. Apparatus according to any one of claims 1 to 7 wherein, in the compact storage state of the platform, the side regions each define an obtuse angle with the central region.
9. Apparatus according to claim 8 wherein the angle is in the range 100° to 170°.
10. Apparatus according to claim 9 wherein the angle is in the range 120° to 150°.
1 1. Apparatus according to claim 6 or claim 7 wherein the end wall sections are formed so that a first of the end wall sections defines an acute angle with the central region of the platform, and so that a second of the end wall sections defines an obtuse angle with the central region of the platform in the compact storage state of the platform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/IB2009/052797 WO2011001205A1 (en) | 2009-06-29 | 2009-06-29 | Blast hole plugging apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/IB2009/052797 WO2011001205A1 (en) | 2009-06-29 | 2009-06-29 | Blast hole plugging apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2011001205A1 true WO2011001205A1 (en) | 2011-01-06 |
Family
ID=41820567
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IB2009/052797 WO2011001205A1 (en) | 2009-06-29 | 2009-06-29 | Blast hole plugging apparatus |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2011001205A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013019658A (en) * | 2011-07-14 | 2013-01-31 | Ohbayashi Corp | Spacer for excavation method by blasting which is fixed in explosive loading hole, and excavation method by blasting |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5247886A (en) * | 1992-10-14 | 1993-09-28 | The Curators Of The University Of Missouri | Blast plug and stemming construction for blast holes |
| WO2006045144A1 (en) * | 2004-10-27 | 2006-05-04 | Sanleo Holdings Pty Ltd | Platform and a method of locating an object in a borehole |
| AU2007201040A1 (en) * | 2006-03-09 | 2007-09-27 | Crinum Ip Pty Ltd | Improvements in explosives decking systems |
| WO2009037529A1 (en) * | 2007-09-20 | 2009-03-26 | Koen Alixe Mauritz Dhooge | Blast hole plugging apparatus |
-
2009
- 2009-06-29 WO PCT/IB2009/052797 patent/WO2011001205A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5247886A (en) * | 1992-10-14 | 1993-09-28 | The Curators Of The University Of Missouri | Blast plug and stemming construction for blast holes |
| WO2006045144A1 (en) * | 2004-10-27 | 2006-05-04 | Sanleo Holdings Pty Ltd | Platform and a method of locating an object in a borehole |
| AU2007201040A1 (en) * | 2006-03-09 | 2007-09-27 | Crinum Ip Pty Ltd | Improvements in explosives decking systems |
| WO2009037529A1 (en) * | 2007-09-20 | 2009-03-26 | Koen Alixe Mauritz Dhooge | Blast hole plugging apparatus |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013019658A (en) * | 2011-07-14 | 2013-01-31 | Ohbayashi Corp | Spacer for excavation method by blasting which is fixed in explosive loading hole, and excavation method by blasting |
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