EP0471649A1 - Marteau actionné par un fluide de pression - Google Patents

Marteau actionné par un fluide de pression Download PDF

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Publication number
EP0471649A1
EP0471649A1 EP91810620A EP91810620A EP0471649A1 EP 0471649 A1 EP0471649 A1 EP 0471649A1 EP 91810620 A EP91810620 A EP 91810620A EP 91810620 A EP91810620 A EP 91810620A EP 0471649 A1 EP0471649 A1 EP 0471649A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
sleeve
piston
hammer according
bush
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Withdrawn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
EP91810620A
Other languages
German (de)
English (en)
Inventor
Heinz Steiner
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.)
Schweizerische Industrie Gesellschaft
Original Assignee
Schweizerische Industrie Gesellschaft
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 Schweizerische Industrie Gesellschaft filed Critical Schweizerische Industrie Gesellschaft
Publication of EP0471649A1 publication Critical patent/EP0471649A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/24—Damping the reaction force

Definitions

  • a pneumatic hammer according to the preamble of claim 1 is known from CH-PS 664 730.
  • This hammer has a housing with a cylinder in which a percussion piston can be moved back and forth.
  • a coaxial sleeve is axially displaceable between stops relative to the cylinder.
  • the bush has a polygonal guide for a shaft of an impact tool and an abutment shoulder for a flange of the tool.
  • the sleeve is axially preloaded by a stroke-controlled pressure.
  • a rod which can be designed as an anvil or as a piston rod firmly connected to the piston, transmits the impact of the percussion piston to the front end of the tool shaft.
  • the invention has for its object to design a hammer of the type mentioned in such a way that the above disadvantages are avoided. This object is achieved by the combination of features according to claim 1.
  • the breaker shown comprises a multi-part housing 1 consisting of a handle part 2 made of plastic with two handles 3, a valve plate 4 made of metal, a sleeve 5 made of plastic and a base piece 6 made of metal.
  • the housing 1 is held together by several screws 7.
  • the valve plate 4 contains a manually operated inlet valve 8 and a flap valve 9, which alternately applies compressed air to the top 10 and the bottom 11 of a percussion piston 12 and drives the piston 12 back and forth.
  • the piston 12 is inserted in a housing 1, acting as a cylinder, thin-walled steel tube 13 slidably guided.
  • the tube 13 is inserted into a stepped bore 14 in the base piece 6. Its radial step acts as a lower stop 15 for a cylindrical sleeve 16 which is axially displaceably mounted in the tube 13.
  • the sleeve 16 has the same outside diameter as the piston 12. It is secured against rotation relative to the housing 1 by a protruding cam 17, which is guided in a longitudinal slot 18 of the tubes 13. The upper end of the slot 18 forms a stop 19 which limits the stroke of the sleeve 16 upwards.
  • the sleeve 16 has in its lower half a coaxial hexagon through opening, which serves as a guide 20 for the hexagon shaft 21 of a striking tool 22. Adjoining the shaft 21, the tool 22 has a flange 23 which, in the starting position, bears against a torus segment-shaped contact shoulder 24 of the bush 16.
  • the sleeve 16 has a coaxial, cylindrical bore 25, in which a piston rod 26, which is integrally connected to the piston 12, is slidably guided.
  • the piston rod 26 is longer than the maximum stroke of the piston 12, so that the piston rod 26 is also in the upper end position in the bore 25 and thus seals the lower cylinder chamber 27.
  • the flutter valve 9 is connected by a wide, short channel 28 directly to the upper cylinder chamber 29 and by a narrower channel 30 to the lower cylinder chamber 27.
  • the channel 30 opens into the lower cylinder space 27 through an inlet opening 31 which lies above the upper end face 32 of the sleeve 16 in its upper limit position.
  • the pipe 13 has an exhaust opening 33 between the opening 31 and the valve plate 4. The air emerging from the opening 33 escapes through the space 34 between the sleeve 5 and the pipe 13 through an outlet opening 35 of the sleeve 5.
  • the space 34 acts as a silencer.
  • a pawl 36 is pivotally attached on the bottom piece 6.
  • the pawl 36 acts as a stop for the flange 23 when the hammer is pulled.
  • the described hammer works as follows: If the valve 8 is opened, the feed air reaches the flap valve 9. Via the valve 9 and the channels 28, 30, the two cylinder spaces 27, 29 are alternately pressurized with compressed air and the piston 12 with it Piston rod 26 driven back and forth. When the piston 12 has passed over the opening 33, the chamber in question relaxes through the opening. At the same time, some pressure is built up in the counter chamber by the moving piston 12, so that the valve 9 switches over and the piston 12 into the Drives the opposite direction. In the lower end position, the piston rod 26 strikes the front end of the shaft 21. The tool 22 is struck forward and strikes the abutment shoulder 24 again in the event of a rebound.
  • the sleeve 16 is pressed with a force corresponding to the intermittent pressure in the chamber 27 multiplied by the end face 32 against the stop 15.
  • the hammer 3 is pressed so strongly with the handles 3 that the bush 16 does not touch either of the two stops 15, 19 during operation. This can be felt because, under these conditions, the rebound when the rebounding tool 22 strikes against the contact shoulder 24 is practically completely absorbed by the bush 16 and is not transmitted to the housing.
  • the correct operating position or contact pressure can also be determined acoustically because the rebound is barely audible when the operating position is correct.
  • the hexagon 20 can be manufactured with simple, continuous broaching tools.
  • the breaker described is very simple in construction and requires few, simple individual parts, so that it can be manufactured inexpensively. It has a low weight. This makes it handy.
  • the strong damping of the rebound not only improves the comfort of the conditions, but also increases the operational safety and service life compared to known breakers.
  • this force can be designed by a suitable choice of the end face 32 in such a way that it matches the maximum Performance of the hammer corresponds to the optimal contact pressure.
  • the optimum contact pressure is automatically used, which is the effective removal performance Compared to known hammers, which are seldom optimally pressed because the corresponding device for absorbing the rebound blows is missing, or the optimal contact pressure is barely noticeable or audible or too high for ergonomically correct operation.
  • the channel 30 and the opening 31 can be dimensioned relatively small. This not only reduces manufacturing costs, but also reduces air consumption.
  • the cylinder is designed as a relatively thin-walled, continuous tube 13 which guides both the piston 12 and the sleeve 16, this cylinder is inexpensive to manufacture and light.
  • the bush 16 in the guide 20 must have a corresponding shape.
  • the bush 16 can be made in two parts without major disadvantages, the separation advantageously being made at the level of the end of the shaft 21.
  • the hammer can also be operated with hydraulic fluids instead of compressed air.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP91810620A 1990-08-16 1991-08-08 Marteau actionné par un fluide de pression Withdrawn EP0471649A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH266190 1990-08-16
CH2661/90 1990-08-16

Publications (1)

Publication Number Publication Date
EP0471649A1 true EP0471649A1 (fr) 1992-02-19

Family

ID=4238747

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91810620A Withdrawn EP0471649A1 (fr) 1990-08-16 1991-08-08 Marteau actionné par un fluide de pression

Country Status (2)

Country Link
EP (1) EP0471649A1 (fr)
AU (1) AU8177291A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0522344A2 (fr) * 1991-07-09 1993-01-13 Bretec Oy Marteau à coup hydraulique

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR954342A (fr) * 1946-10-04 1949-12-22 Perfectionnements aux marteaux-piqueurs, perforateurs, brise-béton ou autres outilspneumatiques analogues
EP0019563A1 (fr) * 1979-05-15 1980-11-26 Etablissements Montabert Appareil pneumatique à percussions comprenant un amortisseur de vibration
FR2504440A1 (fr) * 1981-04-28 1982-10-29 Permon Np
EP0080446A2 (fr) * 1981-11-20 1983-06-01 Atlas Copco Aktiebolag Machine à percussion et procédé de contrôle de ladite machine
WO1984002488A1 (fr) * 1982-12-22 1984-07-05 Toernqvist Peter J T Dispositif pour le transfert des mouvements de deux corps entraines dans la direction en avant d'un outil
DE3503174A1 (de) * 1985-01-31 1986-08-07 Willy 7457 Bisingen Kress Bohr- oder schlaghammer
US4614241A (en) * 1984-02-15 1986-09-30 The Stanley Works Impact tool assembly with bit isolating means
FR2596681A1 (fr) * 1986-04-03 1987-10-09 Eimco Secoma Appareil de percussion hydraulique avec dispositif d'amortissement des ondes de choc en retour
CH664730A5 (de) * 1983-07-21 1988-03-31 Sig Schweiz Industrieges Verfahren und vorrichtung zur daempfung des rueckpralles bei schlagwerkzeugen.
CH669142A5 (de) * 1986-04-04 1989-02-28 Sig Schweiz Industrieges Presslufthammer.

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR954342A (fr) * 1946-10-04 1949-12-22 Perfectionnements aux marteaux-piqueurs, perforateurs, brise-béton ou autres outilspneumatiques analogues
EP0019563A1 (fr) * 1979-05-15 1980-11-26 Etablissements Montabert Appareil pneumatique à percussions comprenant un amortisseur de vibration
FR2504440A1 (fr) * 1981-04-28 1982-10-29 Permon Np
EP0080446A2 (fr) * 1981-11-20 1983-06-01 Atlas Copco Aktiebolag Machine à percussion et procédé de contrôle de ladite machine
WO1984002488A1 (fr) * 1982-12-22 1984-07-05 Toernqvist Peter J T Dispositif pour le transfert des mouvements de deux corps entraines dans la direction en avant d'un outil
CH664730A5 (de) * 1983-07-21 1988-03-31 Sig Schweiz Industrieges Verfahren und vorrichtung zur daempfung des rueckpralles bei schlagwerkzeugen.
US4614241A (en) * 1984-02-15 1986-09-30 The Stanley Works Impact tool assembly with bit isolating means
DE3503174A1 (de) * 1985-01-31 1986-08-07 Willy 7457 Bisingen Kress Bohr- oder schlaghammer
FR2596681A1 (fr) * 1986-04-03 1987-10-09 Eimco Secoma Appareil de percussion hydraulique avec dispositif d'amortissement des ondes de choc en retour
CH669142A5 (de) * 1986-04-04 1989-02-28 Sig Schweiz Industrieges Presslufthammer.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0522344A2 (fr) * 1991-07-09 1993-01-13 Bretec Oy Marteau à coup hydraulique
EP0522344A3 (en) * 1991-07-09 1993-07-28 Rammer Bretec Oy Hydraulic impact hammer

Also Published As

Publication number Publication date
AU8177291A (en) 1992-02-20

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