EP0048142B1 - Marteau hydraulique - Google Patents

Marteau hydraulique Download PDF

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Publication number
EP0048142B1
EP0048142B1 EP81304169A EP81304169A EP0048142B1 EP 0048142 B1 EP0048142 B1 EP 0048142B1 EP 81304169 A EP81304169 A EP 81304169A EP 81304169 A EP81304169 A EP 81304169A EP 0048142 B1 EP0048142 B1 EP 0048142B1
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EP
European Patent Office
Prior art keywords
piston
hammer
casing
fluid operated
passageway
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Expired
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EP81304169A
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German (de)
English (en)
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EP0048142A1 (fr
Inventor
Ian Graeme Rear
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Individual
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Individual
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    • 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
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/06—Down-hole impacting means, e.g. hammers
    • E21B4/14—Fluid operated hammers

Definitions

  • This invention relates to a fluid operated hammer used in drill bore holes and the like.
  • the term "upper” when used in relation to a hammer shall refer to that end of the hammer adjacent the top sub and the term “lower” when used in relation to a hammer shall relate to that end of the hammer adjacent the drill bit.
  • a fluid operated hammer comprising a casing defining a bore, means including a drill bit supporting means closing one end, a top sub closing the other end, a hammer piston reciprocally supported in said bore for movement between a retracted position spaced from said drill bit supporting means and an impact position in contact with said drill bit retaining means, a feed tube supported centrally from said top sub within said bore over which said hammer piston reciprocates, porting means in said feed tube hammer piston and bore to alternately cause fluid pressure to pressurise the one space between said one end of said casing and said hammer and then the other space between the other end of the casing and the hammer piston to drive the hammer piston between its retracted position and its impact position, characterised in that said porting means comprises; an elongate axially located aperture in said feed tube; a first passageway in said hammer piston extending between said aperture and an external face of the hammer piston to provide communication with the other space when said piston is contiguous
  • the elongate aperture comprises a set of longitudinally spaced apertures.
  • the internal face of the casing and the external face of the piston adjacent the top sub are each formed with a first annular rib and wherein said ribs engage each other at an intermediate position in the degree of travel of the hammer piston to close communication via said first passageway between the aperture and the other space.
  • the feed tube can be replaced with another of differing characteristics to vary the periodicity of communication of fluids between the ends of the hammer piston.
  • the feed tube is mounted in the casing via a spacer and centralising ring wherein said ring is capable of being replaced by a ring of differing dimensions to vary the volume of the chamber between the hammer piston and the top sub.
  • the drill bit supporting means is capable of limited longitudinal slidable movement in the casing and is retained in the casing via a bit retaining ring located on the internal face of the casing and a rib on external face of the drill bit, supporting means said ribs being engaged when the bit occupies the extended position in the casing and wherein an annular member of resilient shock absorbing material is incorporated in said bit retaining ring to absorb some of the shocks imposed thereon by the bit.
  • the degree of communication between the other space and the first passageway and/or the one space and the second passageway is variable and is inversely proportional to the distance of the piston from the respective end of the casing.
  • the first embodiment of Figures 1, 2, 3 and 4 is directed towards a fluid operated hammer which comprises a cylindrical casing 11 having a top sub 12 mounted at one end and a drill bit 13 mounted at the other end.
  • the drill bit 13 is mounted within a drill chuck 19 which is threadably engaged in the other end of the casing.
  • the drill bit 13 is longitudinally slidable within the chuck for a limited degree of travel therein. Such limited slidable movement of the drill bit 13 is facilitated by a bit retaining ring 14 mounted in the inner end of the chuck which is received within a waisted portion 15 at the innermost end of the drill bit.
  • the innermost end of the drill bit 13 which extends beyond the bit retaining ring 14 is formed with an expanded portion which serves as an anvil 16.
  • the anvil 16 is intended to engage with the bit ring 14 when the hammer is raised from the bottom of a bore hole to permit the drill bit to drop to its lowermost position in the hammer and thus permit fluid "blow-down"
  • the bit ring 14 comprises an annular ring 14a which is separated from the inner end of the drill chuck 19 by an annular ring 14b formed of a resilient material such as rubber, neoprene or like materials which is capable of absorbing some shock forces.
  • the resilient ring 14b is intended to absorb some of the shock forces which may be exerted on the bit ring by the piston 26 of the hammer striking the anvil 16 when the drill bit is in the "blow-down" position to assist in preventing excessive fatigue in the drill bit when the anvil 16 impinges on the drill bit retaining ring 14.
  • the top sub 12 is threadably engaged in the one end of the casing 11 and is provided with a fluid port 17 which communicates with a spring loaded check valve 18 located within the top sub to prevent any reverse fluid flow.
  • the casing 11 also supports a feed tube 20 which is concentrically mounted at the one end of the casing in abutting relationship with the inner end of the top sub 12.
  • the feed tube 20 extends from the one end of the casing for a portion of the length of the casing and the mounting of the feed tube comprises a centralising spacer ring 21 which is retained in the one end of the casing 11 by virtue of abutting shoulders formed on the internal surface of the casing 11 and the external surface of the spacer ring 21 and by suitable keys.
  • the centralising spacer ring 21 receives a flanged portion 22 of the feed tube provided at the one end of the feed tube and thus retains the feed tube such that it is accurately retained concentrically within the casing 11.
  • the flanged portion 22 of the feed tube extends beyond the centralising spacer ring 21 to be located within a suitably shaped recess formed within the top sub 12. Suitable tolerances are provided between the top sub 12 and flanged end of the feed tube in order that any misalignment of the top sub will not affect the alignment of the feed tube 20.
  • Suitable sealing means in the form of O-rings are provided between; the centralising spacer ring 21, the top sub, the flanged end of the feed tube 22 and the centralising spacer ring 14; and the flanged end of the feed tube 22, and the top sub 12; to prevent any loss of fluid from the junctions therebetween and allow some movement of the feed tube in the event that any particles of foreign matter which may be introduced into the fluid so as not to cause the hammer to jam.
  • the centralising spacer ring 21 provides an improved method of locating and centralising the feed tube concentrically within the casing 11 and the piston 26 over previously used methods which have located the feed tube in the lower end of the top sub.
  • the centralising spacer ring 21 may be readily exchanged with other rings of differing thickness in order that the volume of the space between the upper end piston 26 and the top sub 12 may be varied.
  • the other end of the feed tube can be provided with a suitably dimensioned choke (not shown) which permits a controlled continuous flow of fluid down through the drill bit 13.
  • the walls of the feed tube are formed with an elongate aperture 24 the main axis of which is substantially parallel with the longitudinal axis of the hammer.
  • the piston 26 is slidably mounted within the casing 11 to be movable between the top sub 12 and the drill bit 13 over the feed tube 20.
  • the casing 11 is symmetrical about its central transverse plane and is provided towards each end with an annular recess 25.
  • An annular cylindrical sleeve 31 is located within the one end of the casing 11 and extends for a portion of the length thereof such that it extends over the adjacent upper recess 25 formed in the internal walls of the casing 11.
  • the internal face of the cylindrical sleeve 31 is formed with a set of elongate grooves 32 which extend substantially the full length of the sleeve but are interrupted for a portion of their length by a rib 33 which acts as a seal.
  • the piston 26 is formed with a lower portion which has a diameter conforming to that of the casing 11 such that it is sealingly and slidably engaged by the internal face of the casing 11 while the upper portion of the piston 26 is of a reduced diameter which is less than the diameter of the cylindrical sleeve 31 in order that the upper portion of the piston may be received within the sleeve 31.
  • the uppermost end of the piston 26 is formed with an annular rib 35 the diameter of which conforms substantially with the inner diameter of the cylindrical sleeve 31 such that it slidably and sealingly engages with the internal face of the sleeve 31 and with the rib 33 formed in the grooves of the sleeve.
  • a first passageway 28 is formed in the piston 26 between the internal bore thereof and the upper reduced diameter portion of the piston to provide fluid communication between the aperture 24 and the space defined between the external cylindrical face of the upper portion of the piston 26 and the side walls of the casing 11 and cylindrical sleeve 31 when the first passageway is located adjacent the aperture 24 in the feed tube 20.
  • the lower portion of the piston 26 is formed with an annular recess 34 which communicates with the annular recess 25 formed in the inner face of the casing 11 adjacent the drill bit 13 when the piston is located toward the drill bit end of the hammer.
  • the annular recess 34 in the piston 26 communicates with the inner bore of the piston via a second passageway 30 to provide fluid communication between the aperture 24 of the feed tube 20 and the space defined between the lower end of the piston 26 and the drill bit 13.
  • the second passageway 30 is in communication with the aperture 24 in the feed tube 20 such that high pressure fluid enters the space between the lower end of the piston 26 and the drill bit 13, through the easing recesses 25.
  • the piston 26 is driven upwards towards the top sub 12.
  • the duration of the injection of fluid into the space below the lower end of the piston is limited to a short portion of the pistons initial upward movement since during such upward movement, the second passageway 30 breaks from its communication with the lower space due to the separation of the recesses 25 and 34 formed in the casing 11 and the piston 26 respectively.
  • first passageway 28 is brought into communication with the aperture 24 in the feed tube 20 and permits the admission of high pressure fluid into space between the external cylindrical face of the upper end of the piston 26 and the internal face of the casing 11 and the cylindrical sleeve.
  • annular rib 35 formed at the upper end of the piston 26 is in sealing engagement with the ribs 33 which are provided within the grooves 32 in the sleeve 31.
  • the high pressure fluid from the aperture 24 is contained within the space defined between the external cylindrical face of the upper portion of the piston 26 and the internal face of the casing 11 and sleeve 31 and only a limited downward thrust is exerted on the piston on the area of the annular junction between the upper and lower portions of the piston.
  • first port 28 is in open communication with the space between the choked end of the feed tube 20 and the drill bit 13 to permit fluid flow between the space formed by the piston counter bored portion 36 and the space between the upper end of the piston and the top sub. As a result ftuid from the feed tube is directed through the drill bit to effect "blow-down".
  • the fluid operated hammer of the second embodiment as shown in Figures 5, 6 and 7 comprises a casing 111 having a top sub 112 mounted to one end, a drill chuck (not shown) which supports a drill bit 113 mounted to the other end.
  • the mounting of the top sub 112, the drill chuck and the drill bit 113 is of a similar form to that shown and described in relation to the first embodiment.
  • the casing 111 concentrically supports within itself at its one end a feed tube 120 which extends for a portion of the length of the casing and a piston 126 slidably received within the casing 111 to be movable between the drill bit 113 and the top sub 112 over the feed tube 120.
  • the mounting of the feed tube 120 to the casing can take a similar form to that described in relation to the first embodiment.
  • a cylindrical sleeve 131 is concentrically mounted within the one end of the casing to abut the inner face thereof in substantially concentric opposed relation to the feed tube 120.
  • the piston 126 is formed with a lower portion having an external diameter corresponding substantially to the internal diameter of the casing 111 and an upper portion having an external diameter which is less than the internal diameter of the sleeve 131.
  • the upper end of the piston 126 is formed with an annular rib 135 which has an external diameter corresponding substantially to the internal diameter of the casing 111 and an upper portion having an external diameter which is less than the internal diameter of the sleeve 131.
  • the upper end of the piston 126 is formed with an annular rib 135 which has an external diameter corresponding substantially to the internal diameter of the sleeve 131 such that it sealingly and slidably engages the inner face of the sleeve 131.
  • a further annular rib 137 is formed at an intermediate position along the upper portion of the piston 126 and it also has an external diameter corresponding substantially to the internal diameter of the sleeve 131 to slidably and sealingly engage with the inner face of the sleeve 131.
  • the sleeve 131 is formed with a set of elongate grooves 132 which extend the substantially full length of the sleeve 131 but terminate short of the free end of the sleeve 131 to form a sealing rib 133b which will sealingly engage with the ribs 137 and 135 of the piston.
  • the lower portion of the piston is formed with a series of circumferentially spaced flutes 138 on its external face which extend from the junction between the upper and lower portions of the piston 126 for a portion of a length of the lower portion.
  • the piston has a first passageway 128 extending between the core of the piston and the external face of the piston between the upper annular rib 135 and the intermediate rib 137; and a second passageway 130 between the base of the piston and between the intermediate rib 137 and the lower portion of the piston.
  • the walls of the casing 111 are formed with an annular recess 125 at each end.
  • the upper recess is covered by the sleeve 131 lower recess communicates with the flutes 138 in the lower end of the piston 126 when the piston 126 is at the lowermost position in the hammer.
  • the feed tube 120 is formed with a set of apertures 124 comprising three apertures spaced longitudinally along the feed tube.
  • the apertures are of different dimensions and are such that the first aperture 124a closed to the face end of the feed tube is smaller and is circular, the second aperture 124b is larger and is elongate transverse to the feed tube and the third aperture 124c the largest and is elongate in the longitudinal axis of the feed tube.
  • the first passage 128 begins to sequentially engage with each of the apertures 124a, b and c.
  • the upper annular rib 135 of the piston disengages from the intermediate rib 133a of the cylindrical sleeve to admit the high pressure fluid contained between the cylindrical face of the piston and the casing into the space between the upper end 129 of the piston 126 and the top sub 112 ( Figure 5).
  • the admission of such contained fluid together with furtherfluid from the apertures 124 decelerates the piston 126 in its upward movement until it stops short of the top sub 112.
  • the second embodiment a thrust is applied to the piston 126 for a considerable portion of its downward movement.
  • the length of the feed tube which is required to admit fluid into the hammer is less than those conventionally in use thus reducing the amount of milling required in production of such feed tube and the degree of accurate milling required on the internal bore of the piston 126.
  • the casing 111 is symmetrical about its central transverse plane, it may be readily reversed on one end becoming worn.
  • FIG. 8 An alternative form of mounting of the feed tube mounting is shown at Figure 8.
  • the feed tube 220 as shown is formed with a flanged end 222 which is supported in the casing 211 by a spacer and centralising ring 221 which is supported concentrically within the casing and sleeve 231.
  • the flanged end of the feed tube is held in abutting relation with the check valve and distributor housing 218.
  • Figure 9 is a sectional side elevation of the sleeve 131 of the second embodiment and illustrates the elongate slots 132 formed thereon which are interrupted part way along their length to define an intermediate rib 133a.
  • the lower end of the slots 132 terminate short of the lower end of the sleeve 131 to define the lower rib 133b therein.
  • slots 132 in the sleeve may be replaced by counter-bored sections in the walls of the sleeve.
  • an alternative form of the sleeve 331 of the second embodiment provides for the lower portion of each slot above an intermediate rib 333a being configured such that the lower end of an upper slot 332a is of a reduced width.
  • Figure 11 illustrates an alternative form of the piston of the second embodiment.
  • flutes 438 formed in the lower portion of a piston 426 are of different length such that one half of the flutes are longer than the other.
  • the admission of fluid into the space below the piston is maintained for a longer period but in a controlled reduced manner in the early and final stages of such admission.
  • Figure 12 is a part sectional side elevation of an alternative form of the casing at the upper edge of the recess 525 of a casing 511.
  • the upper edge of the casing 511 is splined as shown to form slots 540 to'reduce the area available for fluid communication with the space below the lower end of the piston.

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  • 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)
  • Percussive Tools And Related Accessories (AREA)
  • Earth Drilling (AREA)

Claims (20)

1. Marteau à actionnement par fluide, comportant une enveloppe (11) définissant un alésage, des moyens comportant une tête de perçage qui supporte des moyens (13) de fermeture d'une extrémité, un sous-ensemble supérieur (12) qui ferme l'autre extrémité, un piston de marteau (26) monté dans ledit alésage pour pouvoir se déplacer de manière alternative entre une position rétractée éloignée de ladite tête de perçage supportant les moyens (13) et une position d'impact au contact de ladite tête de perçage supportant les moyens (13), un tube d'alimentation (20) supporté de manière centrale à partir dudit sous-ensemble supérieur (12) dans ledit alésage, ledit piston de marteau se déplaçant de manière alternative par-dessus celui-ci, des moyens de communication dans ledit tube d'alimentation (20), le piston de marteau (26) et l'alésage pour que la pression du fluide soit transmise à un premier espace situé entre ladite première extrémité de l'enveloppe (11) et ledit piston de marteau (26), et ensuite dans un second espace situé entre l'autre extrémité de l'enveloppe (11) et le piston de marteau (26) pour entraîner celui-ci entre sa position rétractée et sa position d'impact, caractérisé en ce que lesdits moyens de communication comportent: une ouverture allongée axiale (24) dans ledit tube d'alimentation (20); un premier passage (28) dans ledit piston de marteau (26) qui s'étend entre ladite ouverture (24) et une face externe du piston de marteau (26) pour définir une communication avec l'autre espace quand ledit piston est contigu à l'autre extrémité et pour une proportion significative du degré de déplacement du piston; un second passage (30) dans ledit piston de marteau (26); et une cavité (25) dans l'alésage de l'enveloppe, cette cavité étant contiguë à l'autre extrémité de ladite enveloppe, ledit second passage (30) s'étendant entre ladite ouverture (24) et une face externe du piston (26) pour définir une communication avec le premier espace à travers la cavité (25) quand ledit piston est contigu à la première extrémité.
2. Marteau à actionnement par fluide selon la revendication 1, dans lequel l'ouverture (24) comporte un ensemble d'ouvertures espacées longitudinalement.
3. Marteau à actionnement hydraulique selon l'une quelconque des revendications précédentes, dans lequel la face interne de l'enveloppe (11) et la face externe du piston (26) qui est voisine du sous-ensemble supérieur (12) comportent chacune une première nervure annulaire (33 et 35), ces nervures coopérant l'une avec l'autre pour une position intermédiaire du déplacement du piston du marteau pour fermer la communication à travers ledit premier passage ménagé entre l'ouverture et le second espace.
4. Marteau à actionnement par fluide selon la revendication 3, dans lequel ladite enveloppe (111) comporte une seconde nervure annulaire (133b) située de l'autre côté de ladite première nervure annulaire (133a) à partir dudit sous-ensemble supérieur (12), ladite première nervure annulaire (135) dudit piston de marteau étant située à l'extrémité du piston de marteau du côté du sous-ensemble supérieur, et une seconde nervure annulaire (137) étant situé à une position intermédiaire sur ledit piston, le premier passage (128) débouchant dans la face extérieure du piston de marteau entre les première et seconde nervures prévues sur celui-ci, ledit second passage (130) débouchant dans la face externe au voisinage de la seconde nervure mais en position opposée par rapport au premier passage.
5. Marteau à actionnement par fluide selon la revendication 3 ou 4, dans lequel les nervures annulaires (33, 133a et 133b) de l'enveloppe sont constituées par un manchon (31 et 131) placé dans l'enveloppe.
6. Marteau à actionnement par fluid selon l'une quelconque des revendications précédentes, dans lequel le tube d'alimentation (20) peut être remplacé par un autre tube de caractéristiques différentes pour faire varier la périodicité de communication de fluides entre les extrémités du piston de marteau.
7. Marteau à actionnement par fluide selon l'une quelconque des revendications précédentes, dans lequel le tube d'alimentation est monté dans l'enveloppe à travers une bague (21) d'espacement et de centrage, ladite bague pouvant être remplacée par une bague de dimensions différentes pour faire varier le volume de la chambre définie entre le piston de marteau et le sous-ensemble supérieur.
8. Marteau à actionnement par fluide selon l'une quelconque des revendications précédentes, dans lequel la tête de perçage qui supporte les moyens (13) peut se déplacer suivant un mouvement longitudinal limité de glissement dans l'enveloppe et est retenu dans l'enveloppe à travers une bague (14) de retenue de la tête qui est située sur la face interne de l'enveloppe et une nervure (16) sur la face externe de la tête de perçage, les moyens de support (13) et lesdites nervures venant coopérer quand la tête occupe la position déployée dans l'enveloppe, un organe annulaire (14b) d'une matière élastique d'absorption des chocs étant incorporé dans ladite bague de retenue de la tête pour absorber une partie des chocs qui lui sont appliqués par la tête.
9. Marteau à actionnement par fluid selon la revendication 4, dans lequel la partie du piston de marteau qui est voisine dudit sous-ensemble supérieur présentant la première nervure est d'un diamètre réduit, de sorte que, pour ladite position intermédiaire, lesdites nervures (33 et 35) définissent un espace réservoir entre la face cylindrique extérieure de la partie de diamètre réduit du piston de marteau et la face intérieure de l'enveloppe, ledit premier passage (28) débouchant sur la face externe de la partie de diamètre réduit du piston de marteau, de sorte que, pour ladite position intermédiaire, le fluide qui provient de ladite ouverture est admis dans ledit espace réservoir et que, lorsque, le piston de marteau se déplace vers ledit ensemble supérieur à partir de ladite position intermédiaire, ledit espace réservoir débouche dans l'autre espace.
10. Marteau à actionnement par fluid selon la revendication 9, dans lequel ladite enveloppe présente une seconde nervure annulaire (133b) située du côté opposé de ladite première nervure annulaire (133a) du sous-ensemble supérieur, ladite première nervure annulaire (135) du piston de marteau étant située à l'extrémité du piston de marteau du côté du sous-ensemble supérieur, une seconde nervure annulaire (137) étant située dans une position intermédiaire de la partie de diamètre réduit dudit piston de marteau, le premier passage (128) débouchant dans la partie de diamètre réduit du piston de marteau entre les première et seconde nervures prévues sur celui-ci, et ledit second passage débouchant dans la partie de diamètre réduit du piston de marteau qui est adjacente à la seconde nervure, mais du côté opposé à celle-ci par rapport au premier passage.
11. Marteau à actionnement par fluide selon la revendication 9 ou 10, dans lequel les nervures annulaires de l'enveloppe sont formées sur la face interne d'un manchon (31, 131) placé à l'intérieur de l'enveloppe.
12. Marteau à actionnement par fluide selon la revendication 11, prise en dépendance de la revendication 10, dans lequel la partie de diamètre non réduit dudit piston de marteau présente des cannelures axiales allongées (138) qui s'étendent partiellement le long de la face extérieure du piston à partir de ladite partie de diamètre réduit, lesdites cannelures communiquant avec la cavité (125) qui est ménagée dans les parois de l'enveloppe en adjacence à la tête de perçage.
13. Marteau à actionnement par fluide selon la revendication 12, dans lequel les cannelures (138) sont de longueurs différentes.
14. Marteau à actionnement par fluide selon la revendication 12 ou 13, dans lequel le bord supérieur de ladite cavité présente une configuration cannelée.
15. Marteau à actionnement par fluide selon l'une quelconque des revendications 9 à 14, dans lequel la face interne de ladite enveloppe présente une premier ensemble de cannelures allongées espacées circonférenciellement autour de l'enveloppe, au voisinage du sous-ensemble supérieur, et un second ensemble de cannelures allongées espacées circonférenciellement autour de l'enveloppe et espacées à leur extrémité inférieure à partir de l'extrémité inférieure du tube d'alimentation, ledit second ensemble de cannelures étant espacé dudit premier ensemble de cannelures.
16. Marteau à actionnement par fluide selon la revendication 15, dans lequel l'extrémité inférieure du premier ensemble de cannelures (132a) est de largeur réduite.
17. Marteau à actionnement par fluide selon la revendication 1, caractérisé en ce que le degré de communication entre l'autre espace et le premier passage et/ou le premier espace et le second passage est variable et inversement proportionnel à la distance du piston par rapport à l'extrémité respective de l'enveloppe.
18. Marteau à actionnement par fluide selon la revendication 17, dans lequel l'extrémité de la cavité du côté du sous-ensemble supérieur présente une configuration cannelée.
19. Marteau à actionnement par fluide selon la revendication 17 ou 18, dans lequel ledit second passage communique avec la cavité quand le piston est dans la position d'impact ou à son voisinage, au moyen de cannelures axiales allongées ménagées dans la face extérieure du piston de marteau, lesdites cannelures s'étendant sur des distances différentes le long du piston de marteau vers ladite première extrémité.
20. Marteau à actionnement par fluide selon l'une quelconque des revendications 17 à 19, dans lequel ledit premier passage communique avec l'autre espace par des cannelures axiales allongées ménagées dans l'enveloppe, les côtés desdites cannelures convergeant à mesure que la distance diminue à partir du sous-ensemble supérieur.
EP81304169A 1980-09-11 1981-09-11 Marteau hydraulique Expired EP0048142B1 (fr)

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Application Number Priority Date Filing Date Title
AU5534/80 1980-09-11
AUPE553480 1980-09-11

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EP0048142A1 EP0048142A1 (fr) 1982-03-24
EP0048142B1 true EP0048142B1 (fr) 1985-03-27

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ZA (1) ZA816261B (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU9176182A (en) * 1982-01-04 1983-07-14 Rear, I.G. Fluid operated hammer
DE3362163D1 (en) * 1982-07-23 1986-03-27 Weaver & Hurt Ltd Rock drills
AU676610B2 (en) * 1993-09-20 1997-03-13 Ian Graeme Rear Make up system of a down-the-hole hammer
US5722495A (en) * 1993-09-20 1998-03-03 Rear; Ian Graeme Make up system of a down-the-hole hammer
US7353890B2 (en) 2006-01-09 2008-04-08 Sandvik Intellectual Property Ab Down-the-hole hammer and components for a down-the-hole hammer, and a method of assembling a down-the-hole hammer

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3804181A (en) * 1972-03-29 1974-04-16 Baker Oil Tools Inc Bore hole for hammer drive mechanism
US3944003A (en) * 1972-04-24 1976-03-16 Bakerdrill, Inc. Bore hole air hammer
US4015670A (en) * 1974-09-06 1977-04-05 Ian Graeme Rear Fluid operated hammer
US4030554A (en) * 1975-07-07 1977-06-21 Bakerdrill, Inc. Bore hole airhammer and anvil bit
US4084647A (en) * 1976-07-01 1978-04-18 William Lister Pneumatic percussion hammer
GB1552975A (en) * 1976-12-07 1979-09-19 Atlas Copco Ab Drills

Also Published As

Publication number Publication date
ZA816261B (en) 1982-09-29
DE3169555D1 (en) 1985-05-02
EP0048142A1 (fr) 1982-03-24

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