FR2382985A1 - Hydraulic percussion tool with gas cell energy accumulator - has double piston and controls frequency and magnitude of applied force - Google Patents

Hydraulic percussion tool with gas cell energy accumulator - has double piston and controls frequency and magnitude of applied force

Info

Publication number
FR2382985A1
FR2382985A1 FR7707730A FR7707730A FR2382985A1 FR 2382985 A1 FR2382985 A1 FR 2382985A1 FR 7707730 A FR7707730 A FR 7707730A FR 7707730 A FR7707730 A FR 7707730A FR 2382985 A1 FR2382985 A1 FR 2382985A1
Authority
FR
France
Prior art keywords
hammer
piston
magnitude
applied force
gas
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.)
Withdrawn
Application number
FR7707730A
Other languages
French (fr)
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 FR7707730A priority Critical patent/FR2382985A1/en
Publication of FR2382985A1 publication Critical patent/FR2382985A1/en
Withdrawn legal-status Critical Current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

Landscapes

  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)

Abstract

The percussion unit for bush hammering etc. is operated by hydraulic, and includes a gas-cell (19) energy-accumulator. The unit provides for the adjustment of both the frequency and the magnitude of the applied force. The unit has a compression piston (21) and a hammer-piston (14) within a cylindrical casing (11). A pressurised fluid feed system (1-9) which can vary the fluid pressure in the least one feed line, supplies hydraulic fluid to the casing (11). The gas-cell (19) between the compression piston and the rear of the hammer piston (14), may be formed by a tubular membrane (18), and compressed as the compression hammer (21) advances. A retaining mechanism holds the hammer piston (14), to release it when the gas is compressed, and thus, obtains the abrust projection of the hammer piston. The membrane (18) may be fixed to the rear of the hammer pistn and may locate within the bore of the casing and within an annular volume of oil (11c).
FR7707730A 1977-03-07 1977-03-07 Hydraulic percussion tool with gas cell energy accumulator - has double piston and controls frequency and magnitude of applied force Withdrawn FR2382985A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7707730A FR2382985A1 (en) 1977-03-07 1977-03-07 Hydraulic percussion tool with gas cell energy accumulator - has double piston and controls frequency and magnitude of applied force

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7707730A FR2382985A1 (en) 1977-03-07 1977-03-07 Hydraulic percussion tool with gas cell energy accumulator - has double piston and controls frequency and magnitude of applied force

Publications (1)

Publication Number Publication Date
FR2382985A1 true FR2382985A1 (en) 1978-10-06

Family

ID=9188119

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7707730A Withdrawn FR2382985A1 (en) 1977-03-07 1977-03-07 Hydraulic percussion tool with gas cell energy accumulator - has double piston and controls frequency and magnitude of applied force

Country Status (1)

Country Link
FR (1) FR2382985A1 (en)

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Legal Events

Date Code Title Description
ST Notification of lapse