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GB1478435A - Percussive device - Google Patents

Percussive device

Info

Publication number
GB1478435A
GB1478435A GB1487875A GB1487875A GB1478435A GB 1478435 A GB1478435 A GB 1478435A GB 1487875 A GB1487875 A GB 1487875A GB 1487875 A GB1487875 A GB 1487875A GB 1478435 A GB1478435 A GB 1478435A
Authority
GB
United Kingdom
Prior art keywords
head
piston
front chamber
control
cylinder space
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
GB1487875A
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.)
Tampella Oy AB
Original Assignee
Tampella Oy AB
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 Tampella Oy AB filed Critical Tampella Oy AB
Publication of GB1478435A publication Critical patent/GB1478435A/en
Expired 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
    • B25D9/06—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
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/007—Reciprocating-piston liquid engines with single cylinder, double-acting piston
    • F03C1/0073—Reciprocating-piston liquid engines with single cylinder, double-acting piston one side of the double-acting piston being always under the influence of the liquid under pressure

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Lock And Its Accessories (AREA)

Abstract

The intention is to be able to reduce the wear and permit easier starting. The percussion apparatus has a housing (1) to which a tool can be fastened. A piston (27) with a head (4) is axially movable in a reciprocating manner in a cylinder space in the housing. A sleeve-shaped, axially movable control valve (7) concentrically encloses the piston in such a way that the cylindrical inner face forms a cylindrical wall of the cylinder space surrounding the head. A front chamber (8) is formed in the cylinder space on the percussion side of the head. The front chamber (8) is separated from the control-valve space (6) of the control valve by a housing shoulder (28) surrounding the head. There is a passage (13) in the cylindrical surface of the head in order to produce a pressure-fluid connection between the front chamber and the control-valve space at the level of the end of the percussion movement of the piston. On the other hand, the pressure-fluid connection is interrupted near the end of the stroke movement of the piston (27) by the head (4) and by the shoulder (28). The pressure fluid required for the control of the control valve (7) can thus be obtained in a simple manner from the front chamber (8) of the cylinder space through the passage (13) in the piston head. <IMAGE>
GB1487875A 1974-04-25 1975-04-10 Percussive device Expired GB1478435A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI741267A FI50940C (en) 1974-04-25 1974-04-25 Percussion device driven by a pressure fluid

Publications (1)

Publication Number Publication Date
GB1478435A true GB1478435A (en) 1977-06-29

Family

ID=8505353

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1487875A Expired GB1478435A (en) 1974-04-25 1975-04-10 Percussive device

Country Status (15)

Country Link
JP (1) JPS554554B2 (en)
AT (2) AT340347B (en)
CH (1) CH626823A5 (en)
CS (1) CS181292B2 (en)
DE (1) DE2516546C2 (en)
FI (1) FI50940C (en)
FR (1) FR2268602B1 (en)
GB (1) GB1478435A (en)
IT (1) IT1037190B (en)
NO (1) NO137349C (en)
PL (2) PL94933B1 (en)
RO (1) RO74260A (en)
SE (1) SE423686B (en)
SU (1) SU776569A3 (en)
ZA (2) ZA752371B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005087445A1 (en) * 2004-03-12 2005-09-22 Atlas Copco Construction Tools Ab Hydraulic hammer
US9108311B2 (en) 2009-03-26 2015-08-18 Sandvik Mining And Construction Oy Percussion device

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI56430C (en) * 1975-10-20 1982-08-09 Tampella Oy Ab SLAGANORDNING DRIVEN AV EN TRYCKVAETSKA
US4062411A (en) * 1975-12-05 1977-12-13 Gardner-Denver Company Hydraulic percussion tool with impact blow and frequency control
US4298074A (en) * 1976-08-09 1981-11-03 American Safety Equipment Corporation Surgical device using impulse motor
DE2654875A1 (en) * 1976-12-03 1978-06-08 Hausherr & Soehne Maschf DEVICE FOR AUTOMATICALLY STOPPING A PRESSURIZED IMPACT DEVICE
GB1556754A (en) * 1976-12-10 1979-11-28 Af Hydraulics Hydraulically-actuated percussive device with overstroke damping
SU745670A1 (en) * 1977-01-04 1980-07-07 Институт Горного Дела Со Ан Ссср Air-distributing device of impact-action pneumatic machines
ES469097A1 (en) * 1978-03-31 1980-06-16 Crespo Jose T G Hydraulic apparatus for producing impacts
DE3015696A1 (en) * 1980-04-24 1981-10-29 Salzgitter Maschinen Und Anlagen Ag, 3320 Salzgitter HYRAULIC DRIVING DEVICE FOR A DRIVING TOOL
DE69024978T2 (en) * 1990-07-12 1996-12-12 G Drill Ab STONE DRILLING DEVICE WITH HYDRAULIC DRIVE IN THE HOLE HOLE

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2906244A (en) * 1958-02-24 1959-09-29 Sheldon L Christensen Hydraulic pavement breaker
DE1281370B (en) * 1963-09-06 1968-10-24 Krupp Gmbh Impact device with hydraulically reciprocating pistons
GB1125755A (en) * 1965-04-23 1968-08-28 Vickers Ltd Improvements in or relating to hydraulically operated tools
DE1703753A1 (en) * 1968-07-05 1972-02-24 Ingbuero Dipl Ing Friedrich He Hydraulically operated impact device
US3796050A (en) * 1972-05-18 1974-03-12 Foster Miller Ass High energy rate actuator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005087445A1 (en) * 2004-03-12 2005-09-22 Atlas Copco Construction Tools Ab Hydraulic hammer
US8424614B2 (en) 2004-03-12 2013-04-23 Atlas Copco Construction Tools Ab Hydraulic hammer
US9108311B2 (en) 2009-03-26 2015-08-18 Sandvik Mining And Construction Oy Percussion device

Also Published As

Publication number Publication date
SE7504591L (en) 1975-10-27
NO137349C (en) 1978-02-22
AU7993475A (en) 1976-10-14
CS181292B2 (en) 1978-03-31
IT1037190B (en) 1979-11-10
AT340346B (en) 1977-12-12
FR2268602B1 (en) 1982-02-19
ZA752371B (en) 1976-03-31
FI50940C (en) 1976-09-10
ATA285875A (en) 1977-04-15
PL113145B1 (en) 1980-11-29
NO751476L (en) 1975-10-28
JPS50144967A (en) 1975-11-21
DE2516546C2 (en) 1982-07-29
ATA285975A (en) 1977-04-15
AT340347B (en) 1977-12-12
ZA752372B (en) 1976-03-31
SE423686B (en) 1982-05-24
FI126774A7 (en) 1975-10-26
SU776569A3 (en) 1980-10-30
FI50940B (en) 1976-05-31
JPS554554B2 (en) 1980-01-30
RO74260A (en) 1980-10-30
NO137349B (en) 1977-11-07
DE2516546A1 (en) 1975-11-20
FR2268602A1 (en) 1975-11-21
PL94933B1 (en) 1977-09-30
CH626823A5 (en) 1981-12-15

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19930410