FR2357336A1 - Hydraulic motor for percussion tool e.g. road drill - uses high frequency fluctuating fluid pressure opposing gas buffer to motivate piston - Google Patents

Hydraulic motor for percussion tool e.g. road drill - uses high frequency fluctuating fluid pressure opposing gas buffer to motivate piston

Info

Publication number
FR2357336A1
FR2357336A1 FR7621723A FR7621723A FR2357336A1 FR 2357336 A1 FR2357336 A1 FR 2357336A1 FR 7621723 A FR7621723 A FR 7621723A FR 7621723 A FR7621723 A FR 7621723A FR 2357336 A1 FR2357336 A1 FR 2357336A1
Authority
FR
France
Prior art keywords
piston
high frequency
hydraulic motor
motivate
percussion tool
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.)
Granted
Application number
FR7621723A
Other languages
French (fr)
Other versions
FR2357336B1 (en
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 FR7621723A priority Critical patent/FR2357336A1/en
Publication of FR2357336A1 publication Critical patent/FR2357336A1/en
Application granted granted Critical
Publication of FR2357336B1 publication Critical patent/FR2357336B1/fr
Granted legal-status Critical Current

Links

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
    • B25D9/26—Control devices for adjusting the stroke of the piston or the force or frequency of impact thereof
    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Earth Drilling (AREA)

Abstract

The hydraulic motor is for use on a percussion tool e.g. a road-drill. High frequency fluctuating oil pressures drives a primary piston (10) within a cylinder (9), and recoil pressures are provided by a cushion or buffer of compressible gas. A variable pressure feed controls the flow of hydraulic fluid, and the gas occupies a accumulator cell (16). The primary piston has an axially projecting transmission rod (53) which conveys piston motion to the tool (20), and the rod and the relevant piston face delineates an annular volume (52) within the cylindrical housing. The hydraulic fluid acts on the piston through the medium of this latter annular volume. The gas buffer (16) acts on the opposite piston (10) face, and may be confined by a tubular membrane (11).
FR7621723A 1976-07-09 1976-07-09 Hydraulic motor for percussion tool e.g. road drill - uses high frequency fluctuating fluid pressure opposing gas buffer to motivate piston Granted FR2357336A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7621723A FR2357336A1 (en) 1976-07-09 1976-07-09 Hydraulic motor for percussion tool e.g. road drill - uses high frequency fluctuating fluid pressure opposing gas buffer to motivate piston

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7621723A FR2357336A1 (en) 1976-07-09 1976-07-09 Hydraulic motor for percussion tool e.g. road drill - uses high frequency fluctuating fluid pressure opposing gas buffer to motivate piston

Publications (2)

Publication Number Publication Date
FR2357336A1 true FR2357336A1 (en) 1978-02-03
FR2357336B1 FR2357336B1 (en) 1981-09-18

Family

ID=9175781

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7621723A Granted FR2357336A1 (en) 1976-07-09 1976-07-09 Hydraulic motor for percussion tool e.g. road drill - uses high frequency fluctuating fluid pressure opposing gas buffer to motivate piston

Country Status (1)

Country Link
FR (1) FR2357336A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2460185A1 (en) * 1979-06-29 1981-01-23 Kone Oy PERCUSSION HYDRAULIC MACHINE
FR2462238A1 (en) * 1979-06-26 1981-02-13 Tampella Oy Ab HYDRAULIC PERCUSSION DEVICE, IN PARTICULAR FOR DRILLING APPARATUS
EP1539433B1 (en) * 2002-05-08 2013-12-25 Sandvik Mining and Construction Oy Percussion device with an elastic energy storing material
EP1963052A4 (en) * 2005-12-22 2016-07-27 Atlas Copco Rock Drills Ab Pulse generator and impulse machine for a cutting tool

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2462238A1 (en) * 1979-06-26 1981-02-13 Tampella Oy Ab HYDRAULIC PERCUSSION DEVICE, IN PARTICULAR FOR DRILLING APPARATUS
FR2460185A1 (en) * 1979-06-29 1981-01-23 Kone Oy PERCUSSION HYDRAULIC MACHINE
EP1539433B1 (en) * 2002-05-08 2013-12-25 Sandvik Mining and Construction Oy Percussion device with an elastic energy storing material
EP1963052A4 (en) * 2005-12-22 2016-07-27 Atlas Copco Rock Drills Ab Pulse generator and impulse machine for a cutting tool

Also Published As

Publication number Publication date
FR2357336B1 (en) 1981-09-18

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Legal Events

Date Code Title Description
ST Notification of lapse