WO2000058058A1 - Marteau-perforateur - Google Patents

Marteau-perforateur Download PDF

Info

Publication number
WO2000058058A1
WO2000058058A1 PCT/IB2000/000344 IB0000344W WO0058058A1 WO 2000058058 A1 WO2000058058 A1 WO 2000058058A1 IB 0000344 W IB0000344 W IB 0000344W WO 0058058 A1 WO0058058 A1 WO 0058058A1
Authority
WO
WIPO (PCT)
Prior art keywords
liner
chuck
drill assembly
wall portions
drill
Prior art date
Application number
PCT/IB2000/000344
Other languages
English (en)
Inventor
Reginald Frederick Taylor
Original Assignee
Reginald Frederick Taylor
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 Reginald Frederick Taylor filed Critical Reginald Frederick Taylor
Priority to AU33151/00A priority Critical patent/AU3315100A/en
Publication of WO2000058058A1 publication Critical patent/WO2000058058A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/08—Means for retaining and guiding the tool bit, e.g. chucks allowing axial oscillation of the tool bit

Definitions

  • This invention relates to a drill assembly, typically forming part of a down-the- hole hammer drill, and to a liner for a drill assembly.
  • Down-the-hole hammer drills typically comprise a drill bit having a splined shank which is located in a complementally splined drive chuck or drive sub which permits axial motion of the drill bit under the urging of a hammer powered by compressed air.
  • a drill assembly comprising a drill bit having a shank formed with a plurality of splines, a chuck formed with a plurality of complemental splines for engaging the shank of the bit and for permitting axial movement thereof relative to the chuck, and a generally cylindrical liner between the splines of the bit and the chuck, the liner being formed of a material selected for suitable wear-resistance and frictional properties
  • the liner may be formed, for example, from a tough plastics material or from a suitable non-ferrous metal
  • the liner is preferably formed with an outer surface shaped complementally to the inner surface of the chuck and with an inner surface shaped complementally to the outer surface of the bit shank, so that it fits snugly between the mating splines of the bit and the chuck
  • the liner may further have concentrically curved inner and outer wall portions and radially extending leading and trailing wall portions joining adjacent inner and outer wall portions
  • leading wall portions of the liner are preferably thicker than the trailing wall portions of the liner
  • leading wall portions of the liner are at least double the thickness of the trailing wall portions of the liner
  • the liner may be a tight fit in the chuck - J
  • the invention extends to a liner for use with a drill assembly, the liner having an outer surface shaped complementally to the inner surface of a chuck of the drill assembly, and an inner surface shaped complementally to the outer surface of a bit shank of the drill assembly, so that that the liner is able to fit snugly between the mating splines of the bit and the chuck.
  • a drill assembly comprising:
  • a chuck formed with a plurality of drive cavities on an inner surface thereof;
  • a generally cylindrical liner sized to be inserted into the chuck, the liner being formed with a plurality of drive cavities on an outer surface thereof and having at least one formation on an inner surface thereof for engaging a drill bit, the liner being formed of a material selected for suitable wear-resistance and frictional properties;
  • a plurality of drive members each sized to be received in one of a plurality of composite drive cavities formed when the liner is inserted into the chuck and the respective drive cavities on the chuck and liner are aligned with one another.
  • the drive members are preferably pins which are made of steel or another kind of metal .
  • the liner preferably defines radially extending wall portions which are shaped complementally to drive formations on the drill bit.
  • the plurality of drive cavities in the chuck and in the liner may have a semi- circular cross section so that the composite drive cavities have a circular cross section, and the drive members will then be circular in cross section.
  • the invention extends to a liner for use with a drill assembly, the liner having a plurality of drive cavities formed in an outer surface thereof, the drive cavities being shaped complementally to drive cavities of a chuck of the drill assembly so that composite drive cavities are formed when the liner is inserted into the chuck, the liner having at least one formation on an inner surface thereof for engaging a drill bit.
  • the inner surface of the liner may have a plurality of radially extending leading and trailing wall portions.
  • leading wall portions of the liner are preferably thicker than the trailing wall portions of the liner, and more preferably are at least double the thickness of the trailing wall portions of the liner.
  • the liner may be formed from a tough plastics material or from a suitable non-ferrous metal.
  • the invention also extends to a chuck for a drill assembly, the chuck having an outer surface adapted to engage with the drill assembly, and an inner surface having a plurality of drive cavities formed therein, the drive cavities being shaped complementally to drive cavities of a liner of the drill assembly so that composite drive cavities are formed when the liner is inserted into the chuck.
  • Figure 1 is a sectional side view of a hammer drill to which the invention is applied;
  • Figure 2 is a partial sectional side view of a chuck or chuck nut of the drill assembly, incorporating a wear resistant liner according to a first embodiment of the invention
  • Figure 3 is a sectional view of the liner in the chuck of Figure 2;
  • Figure 4 is a partial sectional side view of a chuck or chuck nut of the drill assembly, incorporating a wear resistant liner according to a second embodiment of the invention
  • Figure 5 is a sectional side view of the chuck of Figure 4 without the liner inserted;
  • Figure 6 is a sectional end view on the line 6-6 in Figure 5;
  • Figure 7 is a sectional end view of the liner in the chuck of Figure 4.
  • Figure 8 is a sectional view on the line 8-8 of the liner in the chuck of
  • Figure 9 is a sectional view showing two liners which are placed between two aligning indexes of the chuck and the drill bit.
  • Figure 1 shows a hammer drill assembly which is used in down-the-hole drilling and which comprises a cylindrical casing 10 with a drive chuck or chuck nut 12 (also referred to as a drive sub) at one end, and a backhead or top sub 14 at the other end for connection to a drill string.
  • the cylindrical chuck 12 is formed with a number of axial splines on its inner surface (see below), which mate with complemental splines formed on the shank 16 of a drill bit 18, permitting axial movement of the drill bit relative to the chuck.
  • the free end 20 of the bit abuts the end of a piston 22 which is driven reciprocally by compressed air fed through the pipes of the drill string and the backhead 14 via a series of ports, in a conventional manner.
  • the oscillation of the piston 22 causes it to strike the upper end 20 of the drill bit, driving the drill bit into the rock being drilled with an axial percussive force.
  • the entire drill string comprising the drill pipes and the drill assembly are rotated slowly and are fed downwards as the rock is broken by the bit, with the broken rock being flushed upwardly around the drill assembly by compressed air passing through ports in the bit.
  • the present invention provides a wear resistant liner having suitable frictional properties which is fitted to the inner surface of the drive chuck 12.
  • the liner has an outer surface shaped complementally to the inner surface of the chuck, and an inner surface shaped complementally to the outer surface of the bit shank, so that it fits snugly between the mating splines of the bit and the chuck, but permits relative axial movement between them, with low friction.
  • FIG. 2 is a partial sectional view of the drive chuck 12, showing a hollow cylindrical liner 24 fitted thereto, in accordance with a first embodiment of the invention.
  • the liner 24 has a shape which follows the profile of the splines 26 of the drive chuck, and which also defines internal grooves 28 which are complemental in shape to the splines 32 formed on the shank of the drill bit 16.
  • the liner wall 38 has a generally zig-zag shape in section, with concentrically curved inner and outer wall portions 38.1 and 38.2, and radially extending leading and trailing wall portions 38.3 and 38.4 joining adjacent inner and outer wall portions.
  • the upper end of the liner 24 has a circumferential outwardly extending lip 30 which serves to locate the liner in the drive chuck, and the length of the liner corresponds to the length of the splines 26 of the chuck.
  • the splines 26 of the drive chuck and the splines 32 of the drill bit have adjacent parallel drive faces 34 and 36, respectively, which transfer rotational force from the drive chuck to the bit in use.
  • the thickness of the leading liner wall portions 38.3 where they fit between the drive faces is thicker than at the trailing edges 38.4 of the liner profile, where less wear is experienced.
  • the thickness of the leading wall section 38.3 was approximately 7 mm, while that of the trailing wall section 38.4 was approximately 3 mm. Obviously, these dimensions will vary according to the dimensions and design of different drill components, but in general, the thickness of the leading wall section 38.3 will be approximately double that of the trailing wall section 38.4.
  • the material used for the liner needs to have suitable wear resistant properties as well as suitable frictional properties, so that it does not hamper the axial movement of the drill bit in the chuck.
  • Possible materials include Vesconite and Vesconite Hilube (trade marks) or non ferrous metals such as phosphor bronze.
  • Other engineering plastics which are believed to be potentially suitable include Ertalon 66SA, Ertalon 6XAU+ and Ertalyte (trade marks).
  • FIG. 4 A second embodiment of the invention is illustrated in Figures 4 to 8 wherein parts common to the first embodiment have common reference numerals.
  • the cylindrical liner 24 is fitted to the drive chuck 12 with a plurality of drive members in the form of elongate drive pins 42 (only one of which is shown in Figure 4).
  • the pins 42 are inserted into respective drive cavities 44.1 and 44.2 machined in the liner 24 and the drive chuck 12.
  • each of the liner 24 and the drive chuck 12 contains eight elongate cavities 44.1 and 44.2 respectively, having a semi-circular cross section.
  • the cavities 44.1 in the liner and the corresponding cavities 44.2 in the drive chuck will align with one another to form complete or composite cavities 46 of circular cross section, into which the pins 42 are inserted.
  • each cavity 46 was 16mm.
  • the cavities 44.1 in the liner 24 were formed by milling the insert longitudinally with a round-nosed cutter to form eight equi-spaced grooves or cavities disposed about the periphery of the liner and extending parallel to the longitudinal axis of the liner.
  • the corresponding cavities 44.2 in the drive chuck 12 were formed by first drilling 16mm diameter holes in the wall of the chuck, parallel to the longitudinal axis of the chuck, before the inside of the chuck blank was machined out. This had the effect of "leaving half the hole" in the chuck 12, thereby effectively forming the cavities 44.2. It can be noted that the ends of the cavities 44.1 are closed, due to the use of a round-nosed cutter, which ensures retention of the drive pins 42 in the cavities 46.
  • the chuck, liner and pins are assembled by inserting the inner end of the liner a short distance into the chuck.
  • the pins 42 are then greased and placed in position in the drive cavities 44.1 spaced about the periphery of the liner, the pins being held in position by the grease.
  • the liner is then inserted fully into the chuck, so that the pins are then held captive in the composite cavities 46 formed between the aligned cavities 44.1 and 44.2.
  • the pins 42 were formed from 16mm diameter round bar. However, carbon steel bright bar or any other suitable material may be used. It will also be obvious to one skilled in the art that the cavities 46 need not necessarily be circular, but could be polygonal, for example, and in that case the pins 42 need not be made using round bar.
  • the length of the pins in the prototype was 125mm, slightly less than the length of the cavities in which they are received.
  • the second embodiment of the liner engages the splined shank of the drill bit in the same way as in the case of the first liner.
  • the difference between the two liner arrangements is largely that in the case of the second embodiment the inner surface of the chuck is not splined, and that the above described drive member/drive cavity arrangement is used instead.
  • two anti-friction liners 48 and 50 are placed on either side of the liner 24. These two ant-friction liners 48 and 50 are situated between the two indexing (aligning) journals of the drive chuck 12 and the drill bit, so that all of the indexing and drive surfaces of the chuck 12 are protected.
  • the anti-friction liners 48 and 50 can be made from the same material as the liner 24, as described above, or alternatively from bronze, for example.
  • the above described liner helps to prevent excessive wear of the drill bit and chuck, and can have a substantial service life, possibly exceeding the life of the bit.
  • the liner is relatively easy to remove and replace, particularly compared with earlier attempts to insert rods or plates of a low friction material between the mating splines of the bit and chuck.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)

Abstract

L'invention concerne un marteau-perforateur comprenant un revêtement résistant à l'usure (24) doté de propriétés de frottement adéquates logé dans la surface intérieure du mandrin de commande (12) du marteau-perforateur. Le revêtement (24) présente une surface extérieure complémentaire à la surface intérieure du mandrin ainsi qu'une surface intérieure complémentaire à la surface extérieure de la queue (16) du foret de manière à être bien ajusté entre les cannelures (26, 32) du foret et du mandrin tout en assurant un mouvement axial relatif intermédiaire à faible frottement.
PCT/IB2000/000344 1999-03-26 2000-03-24 Marteau-perforateur WO2000058058A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU33151/00A AU3315100A (en) 1999-03-26 2000-03-24 Hammer drill assembly

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA99/2356 1999-03-26
ZA992356 1999-03-26

Publications (1)

Publication Number Publication Date
WO2000058058A1 true WO2000058058A1 (fr) 2000-10-05

Family

ID=25587649

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2000/000344 WO2000058058A1 (fr) 1999-03-26 2000-03-24 Marteau-perforateur

Country Status (2)

Country Link
AU (1) AU3315100A (fr)
WO (1) WO2000058058A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1930127A1 (fr) * 2006-12-05 2008-06-11 Sandvik Mining and Construction Oy Coussinet d'un outil perforateur
US20180065215A1 (en) * 2015-03-10 2018-03-08 Hilti Aktiengesellschaft Driving sleeve in a tool receiving device

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE462666A (fr) *
BE445286A (fr) * 1941-02-03
BE490550A (fr) *
US1832141A (en) * 1928-05-21 1931-11-17 Gardner Denver Co Tool holding chuck
GB2046653A (en) * 1979-03-03 1980-11-19 Fosroc International Ltd Impact Tool Holder
US4702326A (en) * 1984-07-03 1987-10-27 Oy Tampella Ab Coupling arrangement for a drill shank of a percussion drilling machine
US5388842A (en) * 1992-06-16 1995-02-14 Etablissements Montabert Device for holding the tool of a hydraulic rock breaker

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE462666A (fr) *
BE490550A (fr) *
US1832141A (en) * 1928-05-21 1931-11-17 Gardner Denver Co Tool holding chuck
BE445286A (fr) * 1941-02-03
GB2046653A (en) * 1979-03-03 1980-11-19 Fosroc International Ltd Impact Tool Holder
US4702326A (en) * 1984-07-03 1987-10-27 Oy Tampella Ab Coupling arrangement for a drill shank of a percussion drilling machine
US5388842A (en) * 1992-06-16 1995-02-14 Etablissements Montabert Device for holding the tool of a hydraulic rock breaker

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1930127A1 (fr) * 2006-12-05 2008-06-11 Sandvik Mining and Construction Oy Coussinet d'un outil perforateur
US8550180B2 (en) 2006-12-05 2013-10-08 Sandvik Mining And Construction Oy Bearing of a breaking device tool
KR101379573B1 (ko) 2006-12-05 2014-03-31 산드빅 마이닝 앤드 컨스트럭션 오와이 파쇄 장치 공구의 베어링
US20180065215A1 (en) * 2015-03-10 2018-03-08 Hilti Aktiengesellschaft Driving sleeve in a tool receiving device

Also Published As

Publication number Publication date
AU3315100A (en) 2000-10-16

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