Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25D—PERCUSSIVE TOOLS
  • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
  • B25D9/06—Means for driving the impulse member
  • B25D9/12—Means for driving the impulse member comprising a built-in liquid motor, i.e. the tool being driven by hydraulic pressure
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25D—PERCUSSIVE TOOLS
  • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
  • B25D2217/0011—Details of anvils, guide-sleeves or pistons
  • B25D2217/0023—Pistons

Definitions

• the present invention relates to a percussion apparatus, and more particularly to a percussion apparatus powered by a fluid under pressure.
• Percussion devices driven by a fluid under pressure also called breakers, are very powerful devices intended to break rocks.
• Such percussion apparatus can be used for many applications, including creating foundations, reducing blocks after firing, digging tunnels or galleries, and so on.
• a percussion apparatus is more particularly intended to be installed at the end of the arm of a hydraulic excavator which will serve as a carrier and which will provide the hydraulic energy necessary for the operation of the percussion apparatus and the thrust required to maintain the recoil effort created by the operation of the percussion apparatus.
• a percussion apparatus creates shock waves generated by the impact of a striking piston thrown against a tool in contact with the rock to be broken.
• This tool is the wear part intended to transmit the shock waves that will fracture the rock.
• This tool must also withstand the rotational torque created by the terrain when a chisel type tool is used and the tool engages in a rock fault. Finally, for practical reasons, this tool must be mechanically held inside the percussion device during the movements of the latter or during the vacuum strikes for lack of support.
• EP0575270 discloses a device for holding the tool in the body of the percussion apparatus.
• a holding device comprises in particular two retaining keys configured to cooperate each with an abutment face defined by a respective transverse notch provided on the tool.
• Such a holding device ensures an effective and reliable maintenance of the tool for the majority of applications for a percussion device.
• the present invention aims to remedy all or part of these disadvantages.
• the technical problem underlying the invention consists in particular in providing a percussion apparatus which is of simple structure, while ensuring an efficient and reliable operation of the percussion apparatus including for difficult applications.
• the present invention relates to a percussion apparatus, comprising at least:
• a body comprising a first body part and a second body part
• a tool comprising a mounting part slidably mounted in the second body part, the mounting part being provided with a striking surface,
• a striking piston mounted alternately movable in the first body portion, and configured to strike the striking surface of the mounting portion
• the tool mounting portion having an annular retaining rib having a first bearing surface configured to cooperate with a first abutment surface provided in the second body portion so as to limit the movement of movement of the tool to the striking piston, and a second bearing surface opposite the first bearing surface and configured to cooperate with a second abutment surface provided in the second body portion so as to limit the movement of movement of the tool to the opposite of the striking piston and to retain the mounting portion of the tool in the second body part,
• first guiding element and a second guiding element mounted in the second body part, and configured to slidably guide the mounting part of the tool, the first and second guiding elements being arranged on either side the annular retaining rib, and
• An abutment ring mounted in the second body portion and disposed between the first and second guide members, the first abutment surface being provided on the abutment ring and the second abutment surface is provided on the second guide member.
• Such a configuration of the tool, and in particular the presence of the annular retaining rib, provides important contact surfaces between the tool and the body of the apparatus, unlike the apparatus of the prior art where these surfaces of contact were limited to the radii of curvature of the retaining keys and the radii of curvature of the abutment faces defined by the transverse notches provided on the tool.
• the percussion apparatus according to the present invention greatly limits the wear of the tool and the body of the apparatus, and the risk of seizure of the percussion apparatus, and thus has a high reliability.
• the percussion apparatus may further have one or more of the following features, taken alone or in combination.
• At least one, and for example each, of the first and second bearing surfaces is annular.
• At least one, and for example each, of the first and second abutment surfaces is annular.
• the striking piston and the tool extend substantially coaxially.
• the first body portion and the second body portion respectively comprise a piston bore and a tool bore.
• the first bearing surface converges towards the striking piston, and the second bearing surface converges on the opposite side of the striking piston.
• each of the first and second guide elements is formed by a guide sleeve.
• the first and second guide elements are mounted in the tool bore.
• the first and second guide members are more particularly configured to slidably guide the mounting portion of the tool into the tool bore.
• the second guide member is removably mounted in the second body portion, and more particularly in the tool bore.
• the tool mounting portion comprises a first guided portion and a second guided portion disposed on either side of the annular retaining rib and configured to cooperate respectively with the first and second guide elements.
• each of the first and second guide elements comprises a central bore through which the mounting portion of the tool, and for example one of the first and second guided portions of the mounting portion.
• the percussion apparatus further comprises at least one holding element configured to hold the second guide element in the second body part.
• the at least one holding element comprises at least one retaining key.
• the at least one retaining key extends for example through a through bore provided on the second body portion and a retaining slot provided on the second guide member.
• the percussion apparatus comprises two retaining keys extending through two retaining slots provided on the second guide element and diametrically opposed.
• the at least one holding element is removably fastened, for example by screwing, to an end face of the second body part, and comprises a through bore intended for the passage of the tool.
• the mounting portion of the tool and at least one of the first and second guide members are configured to rotatably immobilize the mounting portion relative to the second body portion.
• the central bore of at least one of the first and second guide elements has a non-circular cross section.
• the mounting portion of the tool comprises at least one flat configured to cooperate with one of the first and second guide elements.
• the stop ring is distinct from the first and second guide elements.
• the stop ring is offset axially relative to the first and second guide elements.
• the percussion apparatus further comprises a striking chamber configured to be pressurized and delimited at least in part by the striking piston and the mounting portion of the tool, and a sealing member configured to seal the striking chamber.
• the striking chamber and the sealing element are configured so as to urge the tool away from its theoretical strike position, and more particularly to generate a thrust force on the mounting portion of the tool so as to urge the tool away from its theoretical position of impact.
• the striking chamber is delimited at least in part by the striking surface of the mounting portion.
• the sealing element is disposed between the second body portion and the mounting portion of the tool.
• the sealing element is fixed on the second body portion and is configured to cooperate with the mounting portion of the tool, and for example with a portion of the mounting portion. disposed between the first guided portion and the annular retaining rib.
• the sealing element is a toric or lip seal.
• the sealing element is fixed in an annular groove provided on the second body part.
• the sealing element is disposed between the first guide element and the annular retaining rib.
• the sealing element is disposed between the first guide element and the abutment ring.
• Figure 1 is a schematic longitudinal sectional view of a percussion apparatus according to a first embodiment of the invention.
• Figure 2 is a partial longitudinal sectional view of the percussion apparatus of Figure 1.
• Figure 3 is a side view of a tool of the percussion apparatus of Figure 1.
• Figure 4 is a sectional view along the line IV-IV of Figure 3.
• Figure 5 is a partial longitudinal sectional view of a percussion apparatus according to a second embodiment of the invention.
• Figure 6 is a partial longitudinal sectional view of the percussion apparatus according to a third embodiment of the invention.
• Figure 7 is a partial longitudinal sectional view of the percussion apparatus according to a fourth embodiment of the invention.
• the percussion apparatus 2 shown in Figures 1 to 3 and also called hydraulic breaker, comprises a body 3 having a first body portion 3.1 and a second body portion 3.2 which respectively comprise a piston bore 4 and a tool bore 5.
• the piston bore 4 and the tool bore 5 advantageously extend coaxially.
• the percussion apparatus 2 also comprises a step piston 6 stepped alternately sliding in the piston bore 4, and a tool 7 having a mounting portion 8 slidably mounted in the tool bore 5 and provided with A striking surface 9.
• the striking piston 6 is intended to strike against the striking surface 9 of the tool 7.
• the piston bore 4 and the tool bore 5 can be directly formed in the body 3 or be formed in inserts in the body 3.
• the percussion apparatus 2 further comprises a first guide member 11 and a second guide member 12 mounted in the second body portion 3.2, and configured to slidably guide the mounting portion 8 of the tool 7 into the 5.
• the first and second guide elements 11, 12 are formed by two guide bushes, and are mounted coaxially in the tool bore 5.
• the first and second guide elements 11, 12 respectively comprise two central bores 13, 14 through which the mounting portion 8 of the tool 7 extends, and two guide surfaces 15, 16 which are configured to cooperate with each other. with the mounting portion 8 of the tool 7.
• the second guide element 12 is removably mounted in the tool bore 5.
• the percussion apparatus 2 comprises two holding elements 17, such as retaining keys, configured to hold the second guide member 12 in the tool bore 5.
• Each holding member 17 extends for example through a respective through bore 18 provided on the second body portion 3.2 and a respective holding notch 19 provided on the second guide member 12.
• Each holding member 17 may for example have a circular or oblong cross section.
• the percussion apparatus 2 also comprises an abutment ring 21 mounted in the second body portion 3.2 and extending coaxially with the first and second guide members 11, 12.
• the stop ring 21 is more particularly arranged between the first and second and second guide members 11, 12, and is provided with a first abutment surface 22 which is preferably annular.
• the percussion apparatus 2 further comprises a second abutment surface 23 which is advantageously annular and which is provided, according to the embodiment shown in FIGS. 1 to 3, directly on the second guide element 12.
• the mounting portion 8 of the tool 7 more particularly comprises an annular retaining rib 24, and a first and a second guided portions 25, 26 disposed on either side of the rib. retaining ring 24 and configured to cooperate respectively with the first and second guide elements 11, 12.
• the annular retaining rib 24 advantageously comprises a first bearing surface 24.1 configured to cooperate with the first abutment surface 22 provided on the abutment ring 21 so as to limit the movement of movement of the tool 7 towards the striking piston. 6, and a second bearing surface 24.2 opposite the first bearing surface 24.1 and configured to cooperate with the second abutment surface 23 provided on the second guide element 12 so as to limit the movement of movement of the tool 7 opposite the striking piston 6 and to retain the mounting portion 8 of the tool 7 in the second body portion 3.2.
• each of the first and second bearing surfaces 24.1, 24.2 is annular, and each of the first and second abutment surfaces 22,
• the first bearing surface 24.1 converges towards the striking piston 6, the second bearing surface 24.2 converges on the opposite side of the striking piston 6, and the rib ring retainer
• 24 further comprises a cylindrical intermediate surface 24.3 connecting the first and second bearing surfaces 24.1, 24.2.
• the mounting portion 8 of the tool 7 and at least one of the first and second guide elements 11, 12 are configured to immobilize in rotating the mounting portion 8 relative to the second body portion 3.2.
• the first guided portion 25 has two flats 27 diametrically opposed, and the central bore 13 of the first guide element 11 has a cross section substantially complementary to the cross section of the first guided portion 25.
• FIG. 5 represents a percussion apparatus 2 according to a second embodiment which differs from that represented in FIGS. 1 to 3 essentially in that it comprises a holding element 28 removably fixed, for example by screwing, to a end face 29 of the second body portion 3.2, so as to retain the second guide members 12 in the tool bore 5.
• the holding member 28 advantageously has a through bore 31 for the passage of the 7.
• the holding element 28 has an abutment surface 32 against which the second guide element 12 is able to bear.
• FIG. 6 shows a percussion apparatus 2 according to a third embodiment which differs from that shown in FIG. 5 essentially in that it comprises an intermediate guide element 33 arranged between the abutment ring 21 and the first guide element 11.
• FIG. 7 shows a percussion apparatus 2 according to a third embodiment which differs from that shown in FIGS. 1 to 3 essentially in that it comprises a sealing element 34, such as an O-ring seal or lip seal configured to seal a striking chamber 35 at least partially defined by the striking piston 6 and the first guided portion 25 of the tool 7, the striking chamber 35 being configured to be pressurized.
• the sealing element 34 is for example fixed in an annular groove provided on the second body portion 3.2 between the first guide member 11 and the stop ring 21, and is configured to cooperate with the mounting portion 8 of the 7, and for example with a portion of the mounting portion 8 disposed between the first guided portion 25 and the annular retaining rib 24.
• a sealing member 34 can generate a thrust force F , oriented axially opposite the striking piston 6, on the mounting portion 8 of the tool 7, and in particular on the striking surface 9 of the tool 8, and thus to urge the tool 8 at a distance of its theoretical position of impact. Therefore, if the operator does not exert, with the aid of the carrier on which is fixed the percussion apparatus 2, a minimum thrust on the tool 8 to counteract the thrust force F exerted on the latter, the striking piston 6 can not come to hit the tool 8.
• the apparatus to percussion 2 according to the present invention makes it possible to limit the empty strikes on the tool 8.
• first abutment surface 22 could be directly provided on the second body portion 3.2 or be provided on the first guide element 11, and the second abutment surface 23 could be provided on an abutment member separate from the second guide element 12 and also mounted in the tool bore 5.
• the invention is not limited to the embodiments of this percussion apparatus, described above as examples, it encompasses all the variants.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Percussive Tools And Related Accessories (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=57750281

Family Applications (1)

Country Status (7)

Families Citing this family (3)

Family Cites Families (11)

• 2016
  • 2016-11-17 FR FR1661136A patent/FR3058664B1/fr not_active Expired - Fee Related
• 2017
  • 2017-10-19 EP EP17794389.1A patent/EP3541581A1/de not_active Withdrawn
  • 2017-10-19 CN CN201780071406.0A patent/CN109982814A/zh active Pending
  • 2017-10-19 WO PCT/FR2017/052877 patent/WO2018091791A1/fr unknown
  • 2017-10-19 KR KR1020197014074A patent/KR20190084982A/ko not_active Application Discontinuation
  • 2017-10-19 US US16/461,694 patent/US20190351538A1/en not_active Abandoned
  • 2017-10-19 JP JP2019526597A patent/JP2019535542A/ja active Pending

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