EP0183874B1 - Outil hydraulique de percussion - Google Patents

Outil hydraulique de percussion Download PDF

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Publication number
EP0183874B1
EP0183874B1 EP84114947A EP84114947A EP0183874B1 EP 0183874 B1 EP0183874 B1 EP 0183874B1 EP 84114947 A EP84114947 A EP 84114947A EP 84114947 A EP84114947 A EP 84114947A EP 0183874 B1 EP0183874 B1 EP 0183874B1
Authority
EP
European Patent Office
Prior art keywords
piston
cylinder
piston rod
housing
bore
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
EP84114947A
Other languages
German (de)
English (en)
Other versions
EP0183874A1 (fr
Inventor
Friedhelm Schwarz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP84114947A priority Critical patent/EP0183874B1/fr
Priority to AT84114947T priority patent/ATE47552T1/de
Publication of EP0183874A1 publication Critical patent/EP0183874A1/fr
Application granted granted Critical
Publication of EP0183874B1 publication Critical patent/EP0183874B1/fr
Expired legal-status Critical Current

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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
    • B25D9/14—Control devices for the reciprocating piston
    • B25D9/16—Valve arrangements therefor
    • B25D9/20—Valve arrangements therefor involving a tubular-type slide valve
    • 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
    • B25D9/14—Control devices for the reciprocating piston
    • B25D9/145—Control devices for the reciprocating piston for hydraulically actuated hammers having an accumulator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2209/00—Details of portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D2209/002—Pressure accumulators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2209/00—Details of portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D2209/005—Details of portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously having a tubular-slide valve, which is coaxial with the piston

Definitions

  • the invention relates to a hydraulic impact tool with the features of the preamble of claim 1.
  • the cylinder acts as a bear. Since the cylinder has a larger volume than the piston and the piston rod, the required bear weight can be achieved with relatively small dimensions.
  • the piston rod of the known percussion tool is penetrated by several axial bores, one of which is permanently connected to the high-pressure side, a valve arrangement lying outside the cylinder alternately communicates with the high-pressure and low-pressure side, and the third acts as a control line.
  • the piston rod consists of two end sections and a central section of larger diameter. An upper and a lower piston chamber are thus formed, the cross section of which is represented as an annular surface between the diameters of the piston rod sections. This ring surface is the driving surface for actuating the striking tool.
  • the invention has for its object to simplify the design of the generic hydraulic striking tool and to reduce its overall volume.
  • the impact tool according to the invention can be made very small.
  • a small piston diameter requires little play; a small game means little oil loss.
  • the oil return through the housing of the striking tool can be used in hot operations, since the oil return ensures good heat dissipation.
  • the striking tool has a housing 1, which is composed of several cylindrical parts. The parts are partly welded together and partly clamped by screws 2 inserted in the longitudinal direction. A chisel 4 is held in the lower part of the housing 1 by means of a locking pin 3. An intermediate piston 5 is provided above the chisel 4 and is guided through a guide bush 6 inserted into the housing 1.
  • the hydraulic drive of the striking tool orders from a piston rod 7, which is held immovably within the housing 1.
  • a cylinder 8 is also provided, which is closed by a lower striking plate 9 facing the intermediate piston 5 and an upper cover 10 and has a central piston chamber 11.
  • the cylinder 8 is guided by a cylindrical guide section 12 which is fastened to the housing 1 via struts 13.
  • the piston rod 7 is passed through a rod bore in the cover 10 of the cylinder 8 and protrudes into the piston chamber 11 so that the cylinder 8 can slide on the fixed piston rod 7.
  • the housing 1 is provided with an oil supply 14 which opens into a reservoir 15 and into a bore 16 which is arranged in the longitudinal axis of the piston rod 7.
  • the memory 15 is placed on the housing 1 and crossed by a membrane 17.
  • the bore 16 in the piston rod 7 ends just below the entry of the piston rod 7 into the piston chamber 11 in two transverse bores 18, 19 which lead to an annular space 20 within the cylinder 8.
  • an axial bore 21 is arranged in the wall of the cylinder 8, which connects the annular space 20 to an upper transverse bore 22 which, starting from the axial bore 21, is guided through the wall of the cylinder 8 into the piston space 11.
  • a lower transverse bore 23 is provided below the upper transverse bore 22, which penetrates the entire wall of the cylinder 8 and thus connects the piston chamber 11 to the interior 24 of the housing 1.
  • the housing 1 is provided with an oil drain 25, which has a connection to an interior 24 of the housing 1.
  • a control piston 26 is arranged in the piston chamber 11 at a distance from the end of the piston rod 7.
  • the control piston 26 has an annular groove 27 on its outside, which is connected via transverse bores 28 to a central bore 29 which penetrates part of the control piston 26 and is open to the piston chamber 11.
  • the control piston 26 is displaceable within the piston chamber 11 such that, depending on its position, the annular groove 27 faces the upper transverse bore 22 connected to the oil supply 14 and the lower transverse bore 23 connected to the oil drain 25.
  • the part of the piston chamber 11 below the control piston 26 is connected to a further bore 30 which is axially guided through the wall of the cylinder 8.
  • This further bore 30 ends in a transverse bore 31 leading into the piston chamber 11 Position of the cylinder 8 relative to the piston rod 7, this transverse bore 31 has a connection to an annular gap 32 which is formed between the inner wall of the cylinder 8 and a reduced-diameter middle part of the piston rod 7.
  • the annular gap 32 has transverse bores penetrating through the wall of the cylinder 8 33 permanent connection with the interior 24 of the housing 1 and thus with the oil drain 25.
  • the impact tool described controls itself, that is, apart from control piston 26, no additional valves or slides are required to operate the impact tool. As long as the chisel is not pressed onto a solid surface, the cylinder 8 is in its lowest rest position and the pressure oil flows through the oil supply 14 through the bore 16 and the transverse bores 18 into the interior 24 and via the oil drain 25 without pressure.
  • the chisel 4 In order to put the percussion tool into operation, the chisel 4 must be placed on a solid surface so that the chisel 4 presses the cylinder 8, which acts as a bear, upwards via the intermediate piston 5.
  • the control piston 26 and the cylinder 8, together with the striking plate 9 and the cover 10, have the position shown in FIG. 2.
  • the control piston 26 is pressurized with pressure oil by means of pressure oil via the transverse bore 31 opening into the piston chamber 11 and the axial bore 30 in the wall of the cylinder 8 on the lower control piston surface and thus shifted into the upper position.
  • the reversal has the effect that the control piston 26 now assumes the position shown in FIG. 1.
  • the pressure oil is passed through the axial bore 21 and the upper transverse bore 22, the annular groove 27, the transverse bores 28 and the central bore 29 of the control piston into the piston chamber 11 of the cylinder 8, so that now the annular chamber 20 and the piston chamber 11th are pressurized in the same way.
  • the bear is now moved downwards until it hits the chisel 4 via the intermediate piston 5 and releases the existing kinetic energy to the chisel 4.
  • the transverse bore 31 is connected to the annular gap 32 of the piston rod 7, so that the pressure oil below the control piston 26 via the axial bore 30, via the transverse bore 31, the annular gap 32 and the transverse bore 33 permanently connected to the interior 24 can escape and thereby the control piston 26 is shifted into the lower position shown in Fig. 2 and a renewed work cycle as described above is initiated again.
  • the striking tool comes to a standstill when the chisel 4 is no longer in opposition.
  • the bear not only reaches the striking position during the downward stroke, but also runs into the lowest position, so that the transverse bore 18 extends back into the interior 24 and the short circuit with the unpressurized oil circulation is thus restored in the manner previously described.

Landscapes

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

Claims (4)

1. Outil de percussion hydraulique avec une amenée d'huile (14) et une évacuation d'huile (25), se composant d'un carter (1) dans lequel une tige de piston (7) est disposée immobile et entourée d'un cylindre (8) glissant sur celle-ci en délimitant un espace de piston (11) et guidé à distance de la paroi intérieure du carter (1) et agissant contre un outil (4) placé dans son prolongement, l'amenée d'huile (14) étant reliée à un alésage (16) pratiqué axialement dans la tige de piston (7) et finissant en alésages transversaux (18), et l'évacuation d'huile (25) étant reliée à l'espace intérieur du carter (1), et une soupape de commande étant disposée entre l'amenée d'huile (14) et l'évacuation d'huile (25) caractérisé en ce que la tige de piston (7) est traversée par un unique alésage axial (16) servant à l'alimentation en huile, en ce qu'un alésage transversal (23) reliant l'espace de piston (11) à l'espace intérieur (24) est pratiqué dans la paroi du cylindre (8), en ce que la soupape de commande est disposée dans l'espace de piston (24) et en ce que la surface frontale de la tige de piston (7) agit comme surface motrice.
2. Outil de percussion selon la revendication 1, caractérisé en ce que la soupape de commande contient un piston de commande (26) disposé dans l'espace de piston (11) coaxialement et à distance de la tige de piston (7) et pourvu d'un alésage (29) central qui n'est que partiellement traversant et qui est relié à une gorge annulaire (27) située sur la côté extérieur du piston de commande (26), gorge coopérant de son côté avec deux alésages transversaux (22, 23) prévus dans la paroi du cylindre (8).
3. Outil de percussion selon les revendications 1 et 2, caractérisé en ce que la tige de piston (7) présente dans la zone centrale un diamètre diminué et forme avec la paroi du cylindre (8) un interstice annulaire (32) constamment relié à l'espace intérieur (24) du carter (1) et qui est relié, en fonction de la position relative de la tige de piston (7) et du cylindre (8) l'une par rapport à l'autre, par l'intermédiaire d'un autre alésage transversal (31) susceptible d'être obturé et d'un autre alésage axial (30) situé dans la paroi du cylindre (8), à un espace qui est formé entre la face frontale du piston de commande (26) et une plaque de percussion (9) délimitant le cylindre (8) vers le bas.
4. Outil de percussion selon l'une des revendications 1 à 3, caractérisé en ce que, dans la position la plus basse du cylindre (9), les alésages transversaux (18) de la tige de piston (7) sont reliés à l'espace intérieur (24) du carter (1).
EP84114947A 1984-12-07 1984-12-07 Outil hydraulique de percussion Expired EP0183874B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP84114947A EP0183874B1 (fr) 1984-12-07 1984-12-07 Outil hydraulique de percussion
AT84114947T ATE47552T1 (de) 1984-12-07 1984-12-07 Hydraulisches schlagwerkzeug.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP84114947A EP0183874B1 (fr) 1984-12-07 1984-12-07 Outil hydraulique de percussion

Publications (2)

Publication Number Publication Date
EP0183874A1 EP0183874A1 (fr) 1986-06-11
EP0183874B1 true EP0183874B1 (fr) 1989-10-25

Family

ID=8192338

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84114947A Expired EP0183874B1 (fr) 1984-12-07 1984-12-07 Outil hydraulique de percussion

Country Status (2)

Country Link
EP (1) EP0183874B1 (fr)
AT (1) ATE47552T1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59406589D1 (de) * 1993-03-30 1998-09-10 Integral Medizintechnik Pneumatisches Schlagwerkzeug
US8695726B2 (en) * 2010-12-29 2014-04-15 Medical Enterprises LLC Electric motor driven tool for orthopedic impacting

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2541949A1 (de) * 1974-09-19 1976-04-01 Raymond Int Inc Hydraulisch angetriebene hammeranordnung

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE150463C (fr) *
US3708023A (en) * 1970-12-30 1973-01-02 Inst Gornogo Dela Sibirskogo O Self-propelled air-punching mechanism
US4074777A (en) * 1974-08-08 1978-02-21 Atlas Copco Aktiebolag Pneumatic impact tool
AU478179B2 (en) * 1974-09-06 1975-09-17 Graeme Rear Ian Fluid operated hammer
US4290489A (en) * 1974-12-18 1981-09-22 Charles Leavell Vibrationless pneumatic tools
NL173719C (nl) * 1977-01-17 1984-03-01 Abraham Gien En Bernard Lionel Pneumatische slagmachine.
JPS59209775A (ja) * 1983-05-13 1984-11-28 株式会社ランドマ−クウエスト さく岩機

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2541949A1 (de) * 1974-09-19 1976-04-01 Raymond Int Inc Hydraulisch angetriebene hammeranordnung

Also Published As

Publication number Publication date
ATE47552T1 (de) 1989-11-15
EP0183874A1 (fr) 1986-06-11

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