FR2263398A1 - Hydraulic percussive tool - has changeover valve for driving moving parts to and fro - Google Patents
Hydraulic percussive tool - has changeover valve for driving moving parts to and froInfo
- Publication number
- FR2263398A1 FR2263398A1 FR7407263A FR7407263A FR2263398A1 FR 2263398 A1 FR2263398 A1 FR 2263398A1 FR 7407263 A FR7407263 A FR 7407263A FR 7407263 A FR7407263 A FR 7407263A FR 2263398 A1 FR2263398 A1 FR 2263398A1
- Authority
- FR
- France
- Prior art keywords
- stroke
- movement
- changeover valve
- pressure acting
- parts
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/18—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency wherein the vibrator is actuated by pressure fluid
- B06B1/183—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency wherein the vibrator is actuated by pressure fluid operating with reciprocating masses
-
- 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
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L21/00—Use of working pistons or pistons-rods as fluid-distributing valves or as valve-supporting elements, e.g. in free-piston machines
- F01L21/02—Piston or piston-rod used as valve members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L25/00—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means
- F01L25/02—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means by fluid means
- F01L25/04—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means by fluid means by working-fluid of machine or engine, e.g. free-piston machine
- F01L25/06—Arrangements with main and auxiliary valves, at least one of them being fluid-driven
-
- 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
- B25D2217/0026—Double pistons
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
Hydraulically operated reciprocatory mechanism includes a changeover valve which, in one position, makes hydraulic connections to drive the moving part or parts in one directin and at the end of the resultant stroke of movement is moved to its alternative position in which it reverses the hydraulic connections to drive the moving part or parts back in the opposite direction. At the end of this stroke of movement it is moved back againt to its original position. The changeover valve is moved between its two positions by hydraulic pressure acting on respective pilot pistons and controlled by the moving part or parts, this pressure acting on a relatively large area of the respective pilot piston, being applied just before the end of a stroke movement and leaking away to exhaust during the first part of the next stroke via a restriction through which fluid may be displaced during return movement of the pilot piston. The valve is held in position during the remainder of the respective stroke by hydraulic pressure acting on a relatively small area at the same end of the same pilot piston which is removed when the valve moves to its other position.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7407263A FR2263398A1 (en) | 1974-03-04 | 1974-03-04 | Hydraulic percussive tool - has changeover valve for driving moving parts to and fro |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7407263A FR2263398A1 (en) | 1974-03-04 | 1974-03-04 | Hydraulic percussive tool - has changeover valve for driving moving parts to and fro |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2263398A1 true FR2263398A1 (en) | 1975-10-03 |
FR2263398B1 FR2263398B1 (en) | 1979-05-25 |
Family
ID=9135773
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7407263A Granted FR2263398A1 (en) | 1974-03-04 | 1974-03-04 | Hydraulic percussive tool - has changeover valve for driving moving parts to and fro |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2263398A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2341741A2 (en) * | 1976-02-23 | 1977-09-16 | Koehring Gmbh Bomag Division | HYDRAULIC VIBRATION GENERATOR FOR VIBRATING COMPRESSORS |
FR2354460A1 (en) * | 1976-06-09 | 1978-01-06 | Mitsui Shipbuilding Eng | PULSE HYDRAULIC DEVICE, ESPECIALLY FOR THE ACTION OF TOOLS |
EP0071655A1 (en) * | 1981-08-04 | 1983-02-16 | HEILMEIER & WEINLEIN Fabrik für Oel-Hydraulik GmbH & Co. KG | Pneumatically powered hydraulic pump |
WO1990000106A1 (en) * | 1988-06-30 | 1990-01-11 | Caterpillar Inc. | Synchronized hydraulic hammer arrangement |
AU2002340982B2 (en) * | 2001-11-07 | 2007-12-20 | Sandvik Mining And Construction Oy | Percussion device with a control valve for two alternately striking pistons |
-
1974
- 1974-03-04 FR FR7407263A patent/FR2263398A1/en active Granted
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2341741A2 (en) * | 1976-02-23 | 1977-09-16 | Koehring Gmbh Bomag Division | HYDRAULIC VIBRATION GENERATOR FOR VIBRATING COMPRESSORS |
FR2354460A1 (en) * | 1976-06-09 | 1978-01-06 | Mitsui Shipbuilding Eng | PULSE HYDRAULIC DEVICE, ESPECIALLY FOR THE ACTION OF TOOLS |
EP0071655A1 (en) * | 1981-08-04 | 1983-02-16 | HEILMEIER & WEINLEIN Fabrik für Oel-Hydraulik GmbH & Co. KG | Pneumatically powered hydraulic pump |
WO1990000106A1 (en) * | 1988-06-30 | 1990-01-11 | Caterpillar Inc. | Synchronized hydraulic hammer arrangement |
AU2002340982B2 (en) * | 2001-11-07 | 2007-12-20 | Sandvik Mining And Construction Oy | Percussion device with a control valve for two alternately striking pistons |
US7464635B2 (en) | 2001-11-07 | 2008-12-16 | Sandvik Mining And Construction Oy | Percussion device with a control valve for two alternately striking pistons |
Also Published As
Publication number | Publication date |
---|---|
FR2263398B1 (en) | 1979-05-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |