WO2003009974A1 - Rock drill silencing apparatus - Google Patents

Rock drill silencing apparatus Download PDF

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Publication number
WO2003009974A1
WO2003009974A1 PCT/IB2001/002264 IB0102264W WO03009974A1 WO 2003009974 A1 WO2003009974 A1 WO 2003009974A1 IB 0102264 W IB0102264 W IB 0102264W WO 03009974 A1 WO03009974 A1 WO 03009974A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
rock drill
rock
drill
exhaust
Prior art date
Application number
PCT/IB2001/002264
Other languages
French (fr)
Inventor
Nicolaas Daniel Lombard Burger
Adam Jacobus Von Wielligh
Rudolf Werner Ottermann
Original Assignee
Nicolaas Daniel Lombard Burger
Adam Jacobus Von Wielligh
Rudolf Werner Ottermann
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 Nicolaas Daniel Lombard Burger, Adam Jacobus Von Wielligh, Rudolf Werner Ottermann filed Critical Nicolaas Daniel Lombard Burger
Priority to CA002455685A priority Critical patent/CA2455685C/en
Publication of WO2003009974A1 publication Critical patent/WO2003009974A1/en
Priority to ZA2004/00317A priority patent/ZA200400317B/en

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/24—Guiding or centralising devices for drilling rods or pipes
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B1/00—Percussion drilling
    • E21B1/38—Hammer piston type, i.e. in which the tool bit or anvil is hit by an impulse member

Definitions

  • THIS invention relates to a rock drill silencing apparatus.
  • Pneumatic percussion drills are a major contributor to noise-induced hearing impairment in mines. It is accordingly believed that it would be highly advantageous to have a means whereby the operation of a pneumatic rock drill could be silenced to an acceptable level.
  • the present invention seeks to provide an alternative rock drill silencing apparatus.
  • a rock drill silencing apparatus comprising a tubular housing in which a pneumatic rock drill is reciprocable, an open mouth at a forward end of the housing through which a drill rod attached to the rock drill can project, sealing means about the open mouth, thrust means operable to press the housing towards a rock face to be drilled such that the sealing means seals against that face, air-powered drive means for driving the rock drill in a forward direction in the housing for drilling to take place, air delivery means for delivering compressed air from an external source to the rock drill and the drive means, and exhaust means for conveying the rock drill exhaust and drillings out of the housing.
  • Figure 1 shows a perspective view of a rock drill silencing apparatus according to the invention
  • Figure 2 shows a side view of the apparatus of Figure 1 ;
  • Figure 3 shows a longitudinal cross-sectional view of the housing of the apparatus with a rock drill located therein;
  • Figure 4 shows a cross-section at the line 4-4 in Figure 3.
  • Figure 5 shows a cross-section at the line 5-5 in Figure 3.
  • the rock drill silencing apparatus of the invention includes, as a major component, an elongate rock drill housing 10 which is seen in Figures 1 and 2 and illustrated in more detail in Figures 3 to 5.
  • the housing 10 is hollow with a generally polygonal, in this case generally triangular, cross-section. It is made of a composite plastics material, in this example an 80/20 weave glass-fibre reinforced plastics material treated to have fire-resistant properties consistent with underground mine usage.
  • a conventional pneumatic rock drill 12 in this case a SECOTM model S215TM rock drill, manufactured by The Steel Engineering Company (Pty) Limited of South Africa, is located in the housing 10.
  • a U-shaped bracket 14 straddles and is connected to the body of the rock drill towards the front end thereof.
  • the bracket 14 carries three equiangularly spaced rollers 16 which ride on central, thickened regions 18 of the walls 20 of the housing 10. These regions serve to reinforce the housing walls.
  • Another bracket 22 is connected to the body of the rock drill towards the rear end thereof.
  • the numeral 30 indicates a threaded feed screw which is supported rotatably by forward and rearward bearing assembles 32 which are supported in the housing by brackets 34.
  • a reversible air motor 36 is located in the housing 10 to drive the feed screw.
  • An internally threaded feed nut 38 is engaged with the feed screw.
  • the feed nut has a flange 40 at one end and is externally threaded at the other end.
  • the feed screw passes through the bracket 14 which is clamped relative to the flange 40 by a locknut 42 on the threaded end of the feed nut and an arrangement of spacers and washers 44, 46.
  • the bracket 14 is accordingly anchored to the feed nut.
  • the bracket 22 is connected by a bridging member 24 to the bracket 14 and is accordingly also anchored to the feed nut.
  • the housing 10 has an open mouth 50 at its forward end. This is surrounded by a resiliently flexible seal 52, in this made of a suitable grade of polyurethane. Radial support arms 54 support a central eye 56 through which extends a drill steel 58 chucked to the rock drill 12, as illustrated. As is conventional, the drill steel carries a drill bit 60 at its leading end.
  • the apparatus of the invention also includes a rear support and reaction device in the form of a prop 62.
  • this is a simple telescopic prop which, as shown in Figure 2, can be anchored between the hanging wall or roof 64 of a mine working in which the rock drill 12 is to be used and the footwall or floor 66 of the working.
  • wedges (not shown) can be used to anchor the prop firmly in position at the correct distance from the mining face 68 in which a hole is to be drilled.
  • more sophisticated props which include means to achieve firm anchorage can be used.
  • Typical examples are hydraulically actuated props or CAMLOCKTM - type props could be used in place of the simple prop 62.
  • the prop 62 carries transverse brackets 70 and 72 at different heights.
  • the piston 74 of a pneumatic ram 76 ( Figure 3) is attached to the upper bracket 70.
  • the ram 76 is located at the rear end of the housing 10 and is actuable, with compressed air supplied to the ram cylinder 78, to thrust the entire housing in a forward direction towards the mining face 68.
  • the prop 62 is installed at a predetermined distance from the face 68 and the ram is actuated to drive the housing 10 forwardly so that the seal 52 is pressed firmly against the face.
  • the resilience of the seal enables it to make an effective seal even against a rough and uneven face.
  • the housing is suspended at a position towards its forward end on a cable 80 carried by a transverse bracket 82 on another, similar support prop 84 anchored in position somewhat closer to the face than the prop 62.
  • the rearward end of the housing 10 is closed by an end cap 86.
  • the exhaust port and control unit 90 are mounted on the housing 12 towards the forward end thereof.
  • the exhaust conduit 92 leads to an exhaust receiving unit 94.
  • water and compressed air supply hoses 96 and 98 extend from remote compressed air and water sources (not shown) and are connected to the control unit 90.
  • the control unit 90 includes valve controls, either manually operable as exemplified by the control 91 , or automatic, for controlling the supply of air and water through delivery conduits 93 located internally in the thickened regions 18 of the housing.
  • Air delivery conduits supply compressed air to the backhead 28 of the rock drill 12 for operation of the drill motor, to the air motor 36 for operation of the feed screw and to the ram 76.
  • a water delivery conduit delivers water to the backhead of the rock drill for flushing purposes during drilling.
  • the internal compressed air and water connections are omitted from the drawings in the interests of clarity of illustration.
  • the operation of the apparatus is as follows.
  • the props 62 and 84 are installed at predetermined distances from the face 68.
  • the housing 10 is suspended from the props as shown in Figures 1 and 2.
  • the rock drill 12 is completely retracted in the housing, such that the drill bit 60 does not extend past the seal 52.
  • the ram 76 is extended to press the seal 52 against the face.
  • Compressed air is supplied to the air motor 36 to rotate the feed screw in a sense to drive the rock drill forwardly and compressed air and water are simultaneously supplied to the rock drill to operate it.
  • the arrangement is such that when the driving force applied by the air motor/feed screw mechanism is equal to the resistance to drilling experienced by the drill bit, the air motor stalls at the relevant air pressure. Drilling into the rock now commences with the air motor maintaining a constant driving force to cause penetration of the drill bit into the rock.
  • valve arrangement is such that when the full depth of the hole has been drilled, the air motor is reversed, preferably automatically, to rotate the feed screw in the opposite direction, thereby drawing the rockdrill rearwardly in the housing and withdrawing the drill steel from the drilled hole into the housing 10.
  • the operator can stand away from the apparatus. He may be equipped with a stand-off control for operating the control unit and controlling the supply of water and air to the working parts of the apparatus from a remote position. He may for instance be stationed well away from the dangerous face area during the entire operation. In a fully automated system he could in fact be setting up another apparatus to drill a second hole while drilling of a first hole is still under way.
  • the housing serves to contain and silence the operation of the rock drill. Air exhausted by the rock drill, together with rock drillings flushed from the drilled hole by the water, and the water itself, are removed from the housing through the exhaust port 88 and are taken to the exhaust receiving unit 94 through the conduit 92.
  • the exhaust receiving unit 94 will include apparatus for separating liquid and solid components from the exhaust air.
  • the rock drillings may for instance be separated and collected to provide real-time assay samples. Any oily contaminants arising from the operation of the drill could be also be separated from the water component, enabling the water to be re-used if necessary.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Abstract

The invention is concerned with a rock drill silencing apparatus that includes a tubular housing (10) in which a pneumatic rock drill (12) can reciprocate. The housing has an open mouth (50) at its forward end through which a drill rod (58) attached to the rock drill can project. There is a seal (52) about the open mouth and a thrusting arrangement to press the housing towards a rock face (68) to be drilled such that the seal seals against that face. An air motor (36) and feed screw arrangement drives the rock drill in a forward direction in the housing during drilling. Air and flushing water conduits are arranged to deliver compressed air and water from external sources to the rock drill and air motor and there is an exhaust for conveying the rock drill exhaust, drillings and flushing water out of the housing.

Description

"ROCK DRILL SILENCING APPARATUS"
BACKGROUND TO THE INVENTION
THIS invention relates to a rock drill silencing apparatus.
Pneumatic percussion drills are a major contributor to noise-induced hearing impairment in mines. It is accordingly believed that it would be highly advantageous to have a means whereby the operation of a pneumatic rock drill could be silenced to an acceptable level.
One prior attempt to silence the operation of a rock drill is described in the specification of South African patent 97/7248. Here a pneumatic rock drill is located in a cylinder in the manner of a piston. Drilling thrust is provided by compressed air introduced into the cylinder behind the drill to drive the drill forwardly in the cylinder. Although the intention was that the enclosure of the drill within the cylinder would reduce noise levels to an acceptable value, the proposal suffered from a number of problems, not least of which was that of ensuring a proper seal between the rock drill/piston and the cylinder.
The present invention seeks to provide an alternative rock drill silencing apparatus. SUMMARY OF THE INVENTION
According to the invention there is provided a rock drill silencing apparatus comprising a tubular housing in which a pneumatic rock drill is reciprocable, an open mouth at a forward end of the housing through which a drill rod attached to the rock drill can project, sealing means about the open mouth, thrust means operable to press the housing towards a rock face to be drilled such that the sealing means seals against that face, air-powered drive means for driving the rock drill in a forward direction in the housing for drilling to take place, air delivery means for delivering compressed air from an external source to the rock drill and the drive means, and exhaust means for conveying the rock drill exhaust and drillings out of the housing.
Other advantageous features of the invention are defined in the appended claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail, by way of example only, with reference to the accompanying drawings in which:
Figure 1 shows a perspective view of a rock drill silencing apparatus according to the invention;
Figure 2 shows a side view of the apparatus of Figure 1 ;
Figure 3 shows a longitudinal cross-sectional view of the housing of the apparatus with a rock drill located therein;
Figure 4 shows a cross-section at the line 4-4 in Figure 3; and
Figure 5 shows a cross-section at the line 5-5 in Figure 3. DESCRIPTION OF A PREFERRED EMBODIMENT
The rock drill silencing apparatus of the invention includes, as a major component, an elongate rock drill housing 10 which is seen in Figures 1 and 2 and illustrated in more detail in Figures 3 to 5.
As will be apparent from Figures 4 and 5, the housing 10 is hollow with a generally polygonal, in this case generally triangular, cross-section. It is made of a composite plastics material, in this example an 80/20 weave glass-fibre reinforced plastics material treated to have fire-resistant properties consistent with underground mine usage. A conventional pneumatic rock drill 12, in this case a SECO™ model S215™ rock drill, manufactured by The Steel Engineering Company (Pty) Limited of South Africa, is located in the housing 10.
A U-shaped bracket 14 straddles and is connected to the body of the rock drill towards the front end thereof. The bracket 14 carries three equiangularly spaced rollers 16 which ride on central, thickened regions 18 of the walls 20 of the housing 10. These regions serve to reinforce the housing walls. Another bracket 22 is connected to the body of the rock drill towards the rear end thereof. Three further equiangularly spaced rollers 26, carried by brackets attached to the backhead 28 of the rock drill, also ride on the regions 18. It will be understood that the regions 18 act as rails for the rollers, allowing the rockdrill to move backwards and forwards in the housing 10 and that the rollers and regions 18 act to guide these movements of the rock drill.
The numeral 30 indicates a threaded feed screw which is supported rotatably by forward and rearward bearing assembles 32 which are supported in the housing by brackets 34. A reversible air motor 36 is located in the housing 10 to drive the feed screw.
An internally threaded feed nut 38 is engaged with the feed screw. The feed nut has a flange 40 at one end and is externally threaded at the other end. The feed screw passes through the bracket 14 which is clamped relative to the flange 40 by a locknut 42 on the threaded end of the feed nut and an arrangement of spacers and washers 44, 46. The bracket 14 is accordingly anchored to the feed nut. The bracket 22 is connected by a bridging member 24 to the bracket 14 and is accordingly also anchored to the feed nut.
With the air motor operational it will be understood that the feed nut will move forwardly or rearwardly on the feed screw, the direction of such movement being dependent on the direction of rotation of the feed screw. Movement of the feed nut is accompanied by corresponding movement of the rock drill itself.
The housing 10 has an open mouth 50 at its forward end. This is surrounded by a resiliently flexible seal 52, in this made of a suitable grade of polyurethane. Radial support arms 54 support a central eye 56 through which extends a drill steel 58 chucked to the rock drill 12, as illustrated. As is conventional, the drill steel carries a drill bit 60 at its leading end.
Referring again to Figure 1 , the apparatus of the invention also includes a rear support and reaction device in the form of a prop 62. In the illustrated case this is a simple telescopic prop which, as shown in Figure 2, can be anchored between the hanging wall or roof 64 of a mine working in which the rock drill 12 is to be used and the footwall or floor 66 of the working. With a simple prop of this kind, wedges (not shown) can be used to anchor the prop firmly in position at the correct distance from the mining face 68 in which a hole is to be drilled. In other cases more sophisticated props which include means to achieve firm anchorage can be used. Typical examples are hydraulically actuated props or CAMLOCK™ - type props could be used in place of the simple prop 62.
The prop 62 carries transverse brackets 70 and 72 at different heights. In the illustrated case, the piston 74 of a pneumatic ram 76 (Figure 3) is attached to the upper bracket 70. The ram 76 is located at the rear end of the housing 10 and is actuable, with compressed air supplied to the ram cylinder 78, to thrust the entire housing in a forward direction towards the mining face 68.
In practice, the prop 62 is installed at a predetermined distance from the face 68 and the ram is actuated to drive the housing 10 forwardly so that the seal 52 is pressed firmly against the face. The resilience of the seal enables it to make an effective seal even against a rough and uneven face.
It will be understood that the ram 76 could equally well be attached to the lower bracket 72 if the rock drill is to operate at a lower level.
The housing is suspended at a position towards its forward end on a cable 80 carried by a transverse bracket 82 on another, similar support prop 84 anchored in position somewhat closer to the face than the prop 62. By varying the length of the suspension cable it is possible to vary the inclination of the housing 10 and hence of the rock drill 12, and to set the height at which a hole will be drilled in the face 68.
The rearward end of the housing 10 is closed by an end cap 86. Communicating with the interior of the housing, which is otherwise sealed when the seal 52 is pressed against the face 68, is an exhaust port 88 leading through a control unit 90 to an exhaust conduit 92. As illustrated, the exhaust port and control unit 90 are mounted on the housing 12 towards the forward end thereof. The exhaust conduit 92 leads to an exhaust receiving unit 94.
As shown in Figures 1 and 2, water and compressed air supply hoses 96 and 98 extend from remote compressed air and water sources (not shown) and are connected to the control unit 90. The control unit 90 includes valve controls, either manually operable as exemplified by the control 91 , or automatic, for controlling the supply of air and water through delivery conduits 93 located internally in the thickened regions 18 of the housing. Air delivery conduits supply compressed air to the backhead 28 of the rock drill 12 for operation of the drill motor, to the air motor 36 for operation of the feed screw and to the ram 76. A water delivery conduit delivers water to the backhead of the rock drill for flushing purposes during drilling. The internal compressed air and water connections are omitted from the drawings in the interests of clarity of illustration.
The operation of the apparatus is as follows. The props 62 and 84 are installed at predetermined distances from the face 68. The housing 10 is suspended from the props as shown in Figures 1 and 2. At this stage, the rock drill 12 is completely retracted in the housing, such that the drill bit 60 does not extend past the seal 52. By appropriate valve operation at the control unit 90, the ram 76 is extended to press the seal 52 against the face. Compressed air is supplied to the air motor 36 to rotate the feed screw in a sense to drive the rock drill forwardly and compressed air and water are simultaneously supplied to the rock drill to operate it. The arrangement is such that when the driving force applied by the air motor/feed screw mechanism is equal to the resistance to drilling experienced by the drill bit, the air motor stalls at the relevant air pressure. Drilling into the rock now commences with the air motor maintaining a constant driving force to cause penetration of the drill bit into the rock.
The valve arrangement is such that when the full depth of the hole has been drilled, the air motor is reversed, preferably automatically, to rotate the feed screw in the opposite direction, thereby drawing the rockdrill rearwardly in the housing and withdrawing the drill steel from the drilled hole into the housing 10.
Throughout the drilling operation, the operator can stand away from the apparatus. He may be equipped with a stand-off control for operating the control unit and controlling the supply of water and air to the working parts of the apparatus from a remote position. He may for instance be stationed well away from the dangerous face area during the entire operation. In a fully automated system he could in fact be setting up another apparatus to drill a second hole while drilling of a first hole is still under way. The housing serves to contain and silence the operation of the rock drill. Air exhausted by the rock drill, together with rock drillings flushed from the drilled hole by the water, and the water itself, are removed from the housing through the exhaust port 88 and are taken to the exhaust receiving unit 94 through the conduit 92.
Because the drilled hole is itself effectively sealed off during drilling, drill steel ringing and the noise generated by impacts of the bit against the bottom of the hole are also diminished compared to conventional rock drills in which the hole is exposed around the drill steel.
An added advantage is the fact that the operator is not required to hold the rock drill during a drilling operation. This means that his hands are not exposed to possibly injurious vibrations generated by the rock drill. The vibrations of the rock drill are in any event damped to some extent by the use of rollers 16, 26 of polyurethane.
In initial comparative testwork a prototype apparatus of the type described and an unsilenced SECO™ S215™ rock drill were used to drill a series of holes in a block of norite with a compressive strength in the range 210MPa to 290Mpa. Noise levels were measured at the most likely position of the ears of an operator. Drilling penetration rate was also measured. A rock drill silenced in accordance with the invention was found to produce an average noise level of 85dBA with a penetration rate of 500mm/min. The unsilenced rock drill produced the same penetration rate but at an average noise level of 110dBA. The tests showed that a rock drill silenced in accordance with the invention is capable of producing comparable pentration rates but at far lower noise levels.
The invention envisages that the exhaust receiving unit 94 will include apparatus for separating liquid and solid components from the exhaust air. The rock drillings may for instance be separated and collected to provide real-time assay samples. Any oily contaminants arising from the operation of the drill could be also be separated from the water component, enabling the water to be re-used if necessary.

Claims

1.
A rock drill silencing apparatus comprising a tubular housing in which a pneumatic rock drill is reciprocable, an open mouth at a forward end of the housing through which a drill rod attached to the rock drill can project, sealing means about the open mouth, thrust means operable to press the housing towards a rock face to be drilled such that the sealing means seals against that face, air-powered drive means for driving the rock drill in a forward direction in the housing for drilling to take place, air delivery means for delivering compressed air from an external source to the rock drill and drive means, water delivery means for delivering flushing water from an external source to the rock drill, and exhaust means for conveying the rock drill exhaust, flushing water and drillings out of the housing.
2.
An apparatus according to claim 1 wherein the drive means is operable to drive the rock drill in a forward, drilling direction in the housing and also to withdraw it in a rearward direction after a drilling operation.
3.
An apparatus according to claim 2 wherein the drive means comprises a reversible air motor in the housing, a feed screw arranged to be rotated by the air motor and a feed nut on the feed screw which is arranged to move axially in the housing along the feed screw, when the feed screw rotates, and to which the rock drill is attachable.
4.
An apparatus according to claim 3 wherein the apparatus comprises brackets which are attached to the feed nut and engagable with the rock drill.
5.
An apparatus according to any one of the preceding claims comprising guide means in the housing for guiding movement of the rock drill therein.
6.
An apparatus according to claim 5 wherein the guide means comprises a series of angularly spaced rollers arranged to support and guide the rock drill in the housing.
7.
An apparatus according to any one of the preceding claims wherein the sealing means comprises a resilient skirt secured about the open mouth.
8.
An apparatus according to any one of the preceding claims wherein the housing has a generally polygonal cross-section.
9.
An apparatus according to claim 8 wherein the sides of the polygonal cross-section include thickened regions serving to reinforce those sides and the air and water delivery means includes conduits located internally in the thickened regions.
10.
An apparatus according to claim 8 or claim 9 wherein the housing has a generally triangular cross-section.
11.
An apparatus according to any one of claims 8 to 10 wherein the sides of the housing are formed integrally of plastics material.
12.
An apparatus according to any one of the preceding claims wherein the exhaust means comprises an exhaust conduit leading from the interior of the housing at a position towards the forward end thereof.
13.
An apparatus according to claim 12 and comprising an exhaust receiver to which the exhaust conduit leads.
14.
An apparatus according to claim 13 wherein the exhaust receiver includes separator means to separate liquid and solid components from the exhaust.
15.
An apparatus according to any one of the preceding claims wherein the thrust means comprises a pneumatic ram for acting between a fixed structure and the housing in order to press the housing towards the rock face.
16.
An apparatus according to any one of claims 1 to 14 and including a support and reaction device, anchorable in a mine working in which the rock drill is deployed, to support a rearward end of the housing.
17.
An apparatus according to claim 16 wherein the thrust means comprises a pneumatic ram, actuable between the support and reaction device and the housing, to urge the housing towards the rock face.
18.
An apparatus according to claim 16 or claim 17 wherein the support and reaction device comprises a prop anchorable at an upright attitude between a roof and floor of the mine working.
19.
An apparatus according to claim 18 and including a forward support device for supporting the forward end of the housing.
20.
An apparatus according to claim 19 wherein the forward support device comprises a prop anchorable between the roof and floor of the mine working and from which the housing is suspendable.
21.
An apparatus according to any one of the preceding claims and including a pneumatic percussive rock drill located in the housing and arranged to be driven back and forth in the housing by the drive means.
PCT/IB2001/002264 2001-07-26 2001-11-30 Rock drill silencing apparatus WO2003009974A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA002455685A CA2455685C (en) 2001-07-26 2001-11-30 Rock drill silencing apparatus
ZA2004/00317A ZA200400317B (en) 2001-07-26 2004-01-15 Rock drill silencing apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA200106132 2001-07-26
ZA2001/6132 2001-07-26

Publications (1)

Publication Number Publication Date
WO2003009974A1 true WO2003009974A1 (en) 2003-02-06

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ID=25589252

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PCT/IB2001/002264 WO2003009974A1 (en) 2001-07-26 2001-11-30 Rock drill silencing apparatus

Country Status (3)

Country Link
CA (1) CA2455685C (en)
WO (1) WO2003009974A1 (en)
ZA (1) ZA200400317B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7681690B2 (en) 2007-07-13 2010-03-23 Longyear Tm, Inc. Noise abatement device for a pneumatic tool
US7735603B2 (en) 2008-05-28 2010-06-15 Longyear Tm, Inc. Noise reducing device for a pneumatic tool

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2258051A1 (en) * 1972-11-27 1974-06-06 Kent Air Tool Co PNEUMATIC HAMMER WITH ASSOCIATED SILENCER
DE2420016A1 (en) * 1974-04-25 1975-10-30 Demag Drucklufttechnik Gmbh Mobile pneumatic rock drill - pneumatic line discharges into branch on vibration damped hollow vertical column
GB1584888A (en) * 1977-01-18 1981-02-18 Salzgitter Maschinen Ag Rock drilling apparatus
US4303133A (en) * 1979-02-28 1981-12-01 Compair Construction & Mining Limited Compressed-gas-operated reciprocating-piston devices
US4591009A (en) * 1983-10-24 1986-05-27 Charbonnages De France Drill soundproofing device
EP0440399A1 (en) * 1990-01-27 1991-08-07 John Macdonald & Company (Pneumatic Tools) Limited Improvements in or relating to pneumatic tools
ZA977248B (en) 1996-08-13 1998-02-23 Csir Rock drilling apparatus.
WO2000054001A1 (en) * 1999-03-11 2000-09-14 Rocktek Limited A method and apparatus for fly rock control in small charge blasting

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2258051A1 (en) * 1972-11-27 1974-06-06 Kent Air Tool Co PNEUMATIC HAMMER WITH ASSOCIATED SILENCER
DE2420016A1 (en) * 1974-04-25 1975-10-30 Demag Drucklufttechnik Gmbh Mobile pneumatic rock drill - pneumatic line discharges into branch on vibration damped hollow vertical column
GB1584888A (en) * 1977-01-18 1981-02-18 Salzgitter Maschinen Ag Rock drilling apparatus
US4303133A (en) * 1979-02-28 1981-12-01 Compair Construction & Mining Limited Compressed-gas-operated reciprocating-piston devices
US4591009A (en) * 1983-10-24 1986-05-27 Charbonnages De France Drill soundproofing device
EP0440399A1 (en) * 1990-01-27 1991-08-07 John Macdonald & Company (Pneumatic Tools) Limited Improvements in or relating to pneumatic tools
ZA977248B (en) 1996-08-13 1998-02-23 Csir Rock drilling apparatus.
WO2000054001A1 (en) * 1999-03-11 2000-09-14 Rocktek Limited A method and apparatus for fly rock control in small charge blasting

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7681690B2 (en) 2007-07-13 2010-03-23 Longyear Tm, Inc. Noise abatement device for a pneumatic tool
US7735603B2 (en) 2008-05-28 2010-06-15 Longyear Tm, Inc. Noise reducing device for a pneumatic tool

Also Published As

Publication number Publication date
ZA200400317B (en) 2005-03-30
CA2455685A1 (en) 2003-02-06
CA2455685C (en) 2009-05-19

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