US3609969A - Hydraulic impact device - Google Patents

Hydraulic impact device Download PDF

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Publication number
US3609969A
US3609969A US837064A US3609969DA US3609969A US 3609969 A US3609969 A US 3609969A US 837064 A US837064 A US 837064A US 3609969D A US3609969D A US 3609969DA US 3609969 A US3609969 A US 3609969A
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US
United States
Prior art keywords
impact
piston
cylinder
hydraulic
pressure
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 - Lifetime
Application number
US837064A
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English (en)
Inventor
Jurgen Gerber
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.)
CNH Industrial Baumaschinen GmbH
Original Assignee
O&K Orenstein and Koppel GmbH
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 O&K Orenstein and Koppel GmbH filed Critical O&K Orenstein and Koppel GmbH
Application granted granted Critical
Publication of US3609969A publication Critical patent/US3609969A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B25D9/06—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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S173/00—Tool driving or impacting
    • Y10S173/04—Liquid operated

Definitions

  • a hydraulic impact device with an alternately pressure fluid actuated piston and with a control valve for controlling the impact and return stroke of the impact piston, and with an impact force storing hydraulic accumulator, in which the impact piston is provided with a central blind hole in fluid communication with a hydraulic accumulator adapted instantaneously to release stored fluid into said blind hole.
  • the present invention relates to a hydraulic impact device with a piston which is alternately subjected to pressure fluid and guided in a cylinder, said piston having a mass which is a multiple of the mass of the tool employed for crushing the rock.
  • the device also comprises a control valve for controlling the impact stroke and the return stroke, and furthermore comprises a hydraulic accumulator for storing the impact energy.
  • Hydraulic impact devices have become known, such as compressed air hammers, for carrying out similar operations. In most instances, fast hammers are involved. With heretofore known hammers, for purposes of obtaining a great number of impacts, there are provided two rotary valves which are driven by a rotary motor which is likewise hydraulically operated. In addition thereto, two pneumatic pressure accumulators are provided for storing energy which is released when the piston moves downwardly while the volume above the piston increases.
  • high impact energies as far as the individual impact is concerned, cannot be realized with such a device.
  • such device is rather expensive and the control of the rotary valve is liable to disorders.
  • a higher impact force is intended to be realized by actuating a spring-loaded working piston by a further piston which is under the influence of an eccentric and which likewise acts upon a spring.
  • Such a system is expensive and, while realizing a fast impact sequence, does not permit a high individual impact energy as it is necessary for special operations, for instance, the crushing of large rocks.
  • the hydraulic impact device with an alternately pressure fluid actuated piston which is guided in a cylinder and has a mass representing a multiple of the mass of the chisel or tool for crushing the rock and with a control valve for controlling the impact stroke and return stroke, and with a hydraulic accumulator for storing the impact energy is, in conformity with the present invention, char- 3,609,969 Patented Oct. 5, 1971 ice acterized in that the piston is provided with a central axial blind bore for feeding the pressure medium through a pressure pipe while the impact stroke surface of the piston equals the annular return stroke surface, the annular end face of the piston which faces toward the hydraulic accumulator equalling the end face facing toward the inlet end for the tool to be inserted.
  • the cylinder housing 1 is surrounded by a cylinder pipe 2. Between said cylinder housing 1 and said cylinder pipe 2 there is provided an overflow passage 3, a control conduit 4, a line 5 and further devices for conveying the pressure or control oil.
  • the bottom of the cylinder housing 1 and cylinder pipe 2 are closed by a cover 6 which comprises a bore 7 with a tool holder 8.
  • the tool 9 is inserted through a cover 6 and the tool holder 8.
  • the inserted tool is held in the tool receiving piston 10.
  • Guided in the cylinder housing 1 is an impact piston 11 the head 11a of which has a larger diameter than the shank of said piston 11.
  • the upper end of the cylinder housing 1 is closed by an upper housing cover 12 and a covering hood 13.
  • a pressure pipe 14 In the upper housing cover 12 there are mounted a pressure pipe 14, a valve spool 15, a relief valve 16, a return spring 18 in a recess 17, and bores for conveying the pressure oil.
  • a hydraulic accumulator 14a Above the housing cover 12 there is arranged a hydraulic accumulator 14a which communicates with the pressure conduit 14.
  • the hydraulic pump 19 is through conduit 20, control valve 21, feeding line 22 and conduit 23 connected to the impact device. When turning the impact mechanism off, the oil is in a pressure-free manner conveyed to the reservoir 24.
  • control valve 21 With the control valve 21 occupying the position shown in the drawing and with said control valve assembled in a supporting device together with pump 19, the pump 19 feeds the pressure medium in a pressure-free manner through pump conduit 20 and control valve 21 to the reservoir 24. In order to permit the device to operate, first all chambers have to be filled with oil. To this end, the control valve 21 is moved to the position 11 so that the pump line 20 connects with the reservoir line 23 and the feeding line 22 is connected with the reservoir 24.
  • the oil delivery by the pump 19 can through passage 25, discharge line 26 and compensating line 27 pass into the upper cylinder chamber 28 and through the upper overflow bores 40, through the overflow passage 3 formed by the cylinder housing 1 and cylinder line 2, and through overflow bores 41 into the annular passage 43, and through grooves 30 also the annular chamber 41 can be filled.
  • the relief valve 16 otf its seat By lifting the relief valve 16 otf its seat, the accumulator 14a and the cylinder chamber 53 communicating with the pressure pipe 14 are filled. The air present in these chambers and the excess oil may through passages 32 and 35, feeding line 22 and control valve 21 flow to the reservoir 24 because the valve spool 15 is lifted by the pressure acting upon its end face 34.
  • the relief valve 16 is closed. The device may then be brought into its working position, which means that the tool 9 is placed upon the rock to be crushed, whereby the piston 10 is lifted up to an abutments 63.
  • the control valve 21 is then moved to the position I.
  • the device is now in working position and the oil flow will be as follows:
  • the oil delivered by the pump 19 passes through pump conduit 20, control valve 21, feeding line 22, passage 35, passage 36 and conduit to the annular passage 38.
  • the latter is lifted.
  • the oil pressure in the upper cylinder chamber 28 is passed or forced through the overflow bores 40 and 41 and through the overflow passage 3 displaced into the lower cylinder chamber 50a, 51a.
  • the upper piston surface 49 of the impact piston 11 has nearly the same size as the lower piston surface consisting of the annular surface 50 and the top surface 51, a nearly pressure-free oil exchange occurs.
  • valve spool 15 In order to be sure that the valve spool 15 will remain in its lifted position during the downward movement of the impact piston 11, passage 44 and thereby the lower end face 34 of the valve spool 15 communicates through conduit 59 and discharge line 26 as well as through passage with the reservoir conduit 23. Consequently, the damming up pressure prevailing in line 23 will hold the valve spool 15 in its lifted position and will establish communication between the passages 32 and 35.
  • the instantaneous expansion of the bag 1411 is not interfered with by the pump pressure because the piston 11 is accelerated and the cylinder volume 53 increases, i.e. the cylinder is fed by oil from the bag 14a and from the pump.
  • a hydraulically operable impact device which includes: a cylinder, a first. cover closing one end of said cylinder, a second cover closing the other end of said cylinder, an impact piston reciprocable in said cylinder and having a blind hole substantially centrally located in that end faceof said piston which faces toward said first cover, the bottom of said blind hole forming the impact stroke surface of said piston, said piston also being provided with a fluid operable piston return surface substantially equaling in area the area of said impact stroke surface, the other end face of said piston which faces toward said second cover having an area nearly equaling the area of said first mentioned end face of said impact piston, a hydraulic accumulator arranged outside said to and from said impact stroke surface and the end faces of said piston, said control valve means including a valve spool having an extension extending into the space between said first cover and the adjacent end face of said impact piston for actuation thereby, and that end face of said piston which faces toward said second cover being provided with a recess forming an auxiliary cylinder, said device also including tool holding means having an extension adapted
  • a device in which said impact piston includes surface means for closing off. said conduit means with regard to said auxiliary cylinder.
  • a hydraulically operable impact device which includes: a cylinder, a first cover closing one end of said cylinder, a second cover closing the other end of said cylinder, an impact piston reciprocable in said cylinder and having a blind hole substantially centrally located in that end face of said piston which faces toward said first cover, the bottom of said blind hole forming the impact stroke surface of said piston, said piston also being said accumulator, control valve means operable by said impact piston for controlling the supply of actuating fluid to and from said impact stroke surface and the end faces of said piston, and means comprising spring means yieldably connecting said second cover to said cylinder.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
US837064A 1968-07-03 1969-06-27 Hydraulic impact device Expired - Lifetime US3609969A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681703727 DE1703727A1 (de) 1968-07-03 1968-07-03 Hydraulisches Schlaggeraet

Publications (1)

Publication Number Publication Date
US3609969A true US3609969A (en) 1971-10-05

Family

ID=5688532

Family Applications (1)

Application Number Title Priority Date Filing Date
US837064A Expired - Lifetime US3609969A (en) 1968-07-03 1969-06-27 Hydraulic impact device

Country Status (4)

Country Link
US (1) US3609969A (de)
CH (1) CH491726A (de)
DE (1) DE1703727A1 (de)
FR (1) FR2013373A1 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3892279A (en) * 1971-07-23 1975-07-01 Chicago Pneumatic Tool Co Reciprocating hydraulic hammer
US4052107A (en) * 1975-04-08 1977-10-04 The Secretary Of State For Industry In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland Hydraulic hammers hydraulically driven impactor
US4082471A (en) * 1976-01-02 1978-04-04 Imperial-Eastman Corporation Universal hydraulic impact tool
US4262917A (en) * 1978-10-11 1981-04-21 Ottestad Jack Benton Tool holder for impact tool
US4282937A (en) * 1976-04-28 1981-08-11 Joy Manufacturing Company Hammer
US6321854B1 (en) * 1997-08-22 2001-11-27 Giovanni Bisutti Power tool
US20050145400A1 (en) * 2003-12-19 2005-07-07 Clark Equipment Company Impact tool
US9068484B2 (en) 2013-03-11 2015-06-30 Lawrence Livermore National Security, Llc Double-reed exhaust valve engine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2916191A1 (de) * 1979-04-21 1980-10-23 Horst Knaebel Krafteinheit als antriebsvorrichtung, z.b. zum umformen, verformen, verdichten, schlagen und antreiben
FI60151C (fi) * 1979-06-26 1981-12-10 Tampella Oy Ab Hydraulisk slaganordning
DE3505732A1 (de) * 1985-02-15 1986-08-28 Mannesmann AG, 4000 Düsseldorf Hydraulisch betriebene schlagvorrichtung

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3892279A (en) * 1971-07-23 1975-07-01 Chicago Pneumatic Tool Co Reciprocating hydraulic hammer
US4052107A (en) * 1975-04-08 1977-10-04 The Secretary Of State For Industry In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland Hydraulic hammers hydraulically driven impactor
US4082471A (en) * 1976-01-02 1978-04-04 Imperial-Eastman Corporation Universal hydraulic impact tool
US4282937A (en) * 1976-04-28 1981-08-11 Joy Manufacturing Company Hammer
US4262917A (en) * 1978-10-11 1981-04-21 Ottestad Jack Benton Tool holder for impact tool
US6321854B1 (en) * 1997-08-22 2001-11-27 Giovanni Bisutti Power tool
US20050145400A1 (en) * 2003-12-19 2005-07-07 Clark Equipment Company Impact tool
US7156190B2 (en) * 2003-12-19 2007-01-02 Clark Equipment Company Impact tool
US9068484B2 (en) 2013-03-11 2015-06-30 Lawrence Livermore National Security, Llc Double-reed exhaust valve engine

Also Published As

Publication number Publication date
DE1703727A1 (de) 1972-03-02
CH491726A (de) 1970-06-15
FR2013373A1 (de) 1970-04-03

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