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EP0312831B1 - Dispositif de protection contre les vibrations pour marteau burineur pneumatique - Google Patents

Dispositif de protection contre les vibrations pour marteau burineur pneumatique Download PDF

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Publication number
EP0312831B1
EP0312831B1 EP88116441A EP88116441A EP0312831B1 EP 0312831 B1 EP0312831 B1 EP 0312831B1 EP 88116441 A EP88116441 A EP 88116441A EP 88116441 A EP88116441 A EP 88116441A EP 0312831 B1 EP0312831 B1 EP 0312831B1
Authority
EP
European Patent Office
Prior art keywords
chisel
protective sleeve
intermediate piece
shank
sleeve
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 - Lifetime
Application number
EP88116441A
Other languages
German (de)
English (en)
Other versions
EP0312831A1 (fr
Inventor
Kurt Aigner
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.)
WEHA- LUDWIG WERWEIN GmbH
Original Assignee
WEHA- LUDWIG WERWEIN GmbH
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 WEHA- LUDWIG WERWEIN GmbH filed Critical WEHA- LUDWIG WERWEIN GmbH
Priority to AT88116441T priority Critical patent/ATE87527T1/de
Publication of EP0312831A1 publication Critical patent/EP0312831A1/fr
Application granted granted Critical
Publication of EP0312831B1 publication Critical patent/EP0312831B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B25D17/08—Means for retaining and guiding the tool bit, e.g. chucks allowing axial oscillation of the tool bit
    • 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
    • B25D17/04—Handles; Handle mountings
    • B25D17/046—Sleeve-like handles surrounding the tool bit

Definitions

  • the invention relates to vibration protection in a pneumatic hammer chisel according to the preamble of claim 1.
  • Chisel hammers have a cylinder connected to a pistol handle. An axially extending receiving bore for receiving the rear end of the chisel shaft is provided on the cylinder.
  • the piston which can be moved back and forth in the cylinder bore, transfers its kinetic energy to the chisel.
  • the chisel is held with one hand while the other hand holds the pistol handle.
  • the vibrations of the chisel are transferred to the chisel-guiding hand, which leads to circulatory disorders and permanent damage to the chisel-guiding hand.
  • Working with such a chisel hammer may therefore be carried out for a maximum of 10 minutes per day.
  • DE-OS 35 20 036 has a pneumatic hammer chisel with vibration protection for the content.
  • a protective sleeve surrounding the chisel shaft is provided, which can be connected to the cylinder via a quick coupling.
  • a helical spring is supported in the interior of this protective sleeve, the other end of which rests against a damping ring.
  • a reciprocating bushing is provided in the cylinder, which is supported by a further damping ring on a shoulder of the cylinder.
  • the chisel If the piston strikes the rear face of the chisel shaft, the chisel is moved forward against the force of the coil spring. The impact movement is dampened by the spring and the damping ring arranged between the chisel shaft. During the backward movement of the chisel, a corresponding damping takes place through the damping ring arranged between the bush and the cylinder. The chisel is guided over the protective sleeve.
  • a vibration protection device of the type mentioned is the subject of US-A 29 29 361.
  • the intermediate piece has at its other end a receiving bore for receiving the rear end of chisel shafts, the chisels can have different cutting widths.
  • a rubber damping cylindrical part is arranged, which dampens the transmission of vibrations to the housing, but not the transmission of such vibrations to the intermediate piece and the chisel shaft.
  • this damping part is a wearing part because it is subjected to shear forces during the working movement of the piston.
  • the intermediate piece In order to dampen the transmission of vibrations to the chisel-guiding hand, the intermediate piece has a handle that runs transversely to its axis and carries a rubber sleeve.
  • the chisel cannot be guided exactly with such a handle.
  • the cylinder 1 of the chisel hammer has a cylinder bore 2 in which the piston, not shown, can be moved back and forth. Furthermore, this cylinder is provided with a receiving bore 3, which normally serves to receive the rear end of the chisel shaft.
  • the cylinder 1 is connected to a pistol handle. The structure described above is known.
  • the shaft piece 4 of an intermediate piece 5 is inserted into this receiving hole 3. At its other end, this intermediate piece 5 is provided with a receiving hole 6, which receives the rear end 7 of the chisel shaft 8.
  • the receiving bore 6 and the rear end 7 are each wedge-shaped, so that the rear end 7 is wedged in the bore 6.
  • the chisel shaft 8 has a stop 14 against which the front edge of the protective sleeve 12 comes to rest as a stop 15.
  • the helical spring arranged between the shoulders 9, 11 is subjected to pressure and thus presses the sleeve 12 against the stop 14.
  • the sleeve 12 which can be covered with a jacket made of an elastic material or itself consists of such a material, serves to guide the chisel.
  • the intermediate piece 5, the chisel and the sleeve 12 form a structural unit. This unit can easily be exchanged for another unit by pulling it out of the receiving bore 3 will. If the chisel is no longer usable, its rear end 7 is removed from the bore 6 and a new chisel is inserted into this bore 6, onto which the sleeve 12 was previously placed.
  • an anti-rotation device can be provided between the shaft 8 and the sleeve 12.
  • a helical spring 10 can be provided, which is supported between an abutment shoulder 9 of the intermediate piece 5 surrounding the bore 6 and the rear shoulder 11 of the sleeve 12. This spring 10 presses the sleeve 12 in the direction of the chisel tip 13.
  • the intermediate piece 5, the spring 10 and the sleeve 12 are not subject to wear.
  • an elastic intermediate part 16 can be provided between the stop 15 of the sleeve 12 and the stop 14 on the chisel shaft 8.
  • FIG. 2 A preferred exemplary embodiment is shown in FIG. 2.
  • the protective sleeve is extended to the rear and has a sleeve part 17 which surrounds the intermediate piece 5.
  • the helical spring 10 is arranged between a shoulder 9 'on the intermediate piece 5 and a shoulder 11' on the front end of the sleeve part 17.
  • the sleeve part 17 has an annular shoulder 18 at the rear, which forms a stop 15 'and which is pressed by the spring against the rear annular shoulder on the intermediate piece 5, which serves as a stop 14'.
  • the annular shoulder on the intermediate piece and the annular shoulder 18 thus have the same task as the front edge 15 and the stop 14 according to FIG. 1.
  • An elastic ring corresponding to the ring 16 can be arranged between the stops 14 ', 15'.
  • the protective sleeve 12 with the sleeve part 17 and the annular shoulder 18 preferably consists of a rubber-elastic material.
  • the intermediate piece 5 has a lateral slot 19, to which a further slot 20 on the sleeve part 17 is congruent.
  • the slot 19 opens at the rear end in the further receiving bore 6.
  • a wedge piece can be inserted over the slots 19, 20, with which the chisel can be pressed out of the receiving bore 6.
  • the embodiment according to FIG. 2 has the additional advantage that a commercially available chisel can be used which does not have to have a stop corresponding to the stop 14 according to FIG. 1.
  • the shoulder 9 'on the intermediate piece 5 is offset from the front end to the rear, so that the helical spring can be made relatively long and thus soft.
  • an anti-rotation device is preferably arranged between the intermediate piece 5 and the sleeve part 17.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)

Claims (10)

  1. Dispositif de protection contre les vibrations insatallé dans un marteau-burineur à commande pneumatique, comportant un cylindre (1) et un piston, pouvant se dépalcer dans un sens et dans l'autre dans un alésage cylindrique (2), dont l'énergie cylindrique est transmise à la tige d'outil (8), le cylindre (1) comportant un perçage de positionnement (3), dirigé dans le sens axial, destiné à loger l'extrémité arrière d'un tronçon (4) d'une pièce intercalaire (5), la pièce intercalaire (5) comportant en son autre extrémité un autre perçage de positionnement (6) destiné à loger l'extrémité arrière 7 de la tige d'outil 8, caractérisé en ce qu'on prévoit un manchon de protection (12) qui entoure la tige d'outil (8), le manchon protecteur (12) entourant la tige d'outil (8) d'une manière lâche et permettant un déplacement libre, tandis que l'on prévoit des butées (14, 14', 15, 15'), d'une part sur le manchon de protection (12), d'autre part sur la tige d'outil (8) ou sur la pièce intercalaire (5), qui limitent les possibilités de déplacement du manchon de protection (12) par rapport à la tige d'outil (8) dans la direction de la pointe d'outil (13).
  2. Dispositif selon la revendication 1, caractérisé en ce qu'un ressort spiral (10) est disposé entre la pièce intercalaire (5) et le manchon de protection (12), ressort qui appuie les unes contre les autres les butées (14, 14', 15, 15').
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que l'autre perçage de positionnement (6) et l'extrémité arrière (7) de la tige d'outil (8) ont la forme d'un coin.
  4. Dispositif selon l'une des revendications 1 à 3, caractérisé en ce que le manchon de protection (12) est disposé sur la tige d'outil (8) avec impossibilité de subir une torsion.
  5. Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que les butées (14, 15) sont prévues, d'une part, sur la pointe d'outil (13), et d'autre part, à l'extrémité avant du manchon de protection 12.
  6. Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que le manchon de protection (12) comprend une partie de manchon (17) recouvrant la pièce intercalaire (5) et munie d'un épaulement annulaire (18) servant de butée (15'), épaulement qui coopère avec une butée (14') aménagée sur la pièce intercalaire (5), et ayant la configuration d'un épaulement annulaire.
  7. Dispositif selon la revendication 5 ou 6, caractérisé en ce que lressort spiral (10) est disposé entre un épaulement de butée (9, 9') de la pièce intercalaire (5) et un épaulement (11, 11') du manchon de protection (12) et appuie le manchon de Protection (12) dans la direction de la pointe d'outil (13).
  8. Dispositif selon l'une des revendications 1 à 7, caractérisé en ce que la pièce intercalaire (5) comporte une fente (19) qui court latéralement vers l'extrémité arrière de l'autre perçage de positionnement (6).
  9. Dispositif selon la revendication (8), caractérisé en ce que la partie de manchon (17) comporte une autre fente (20) en alignement avec la fente (19) dans la pièce intercalaire (5).
  10. Dispositif selon l'une des revendications 1 à 9, caractérisé en ce que le manchon de protection (12) est en un matériau élastique.
EP88116441A 1987-10-17 1988-10-05 Dispositif de protection contre les vibrations pour marteau burineur pneumatique Expired - Lifetime EP0312831B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88116441T ATE87527T1 (de) 1987-10-17 1988-10-05 Vibrationsschutzvorrichtung bei einem druckluftbetaetigten meisselhammer.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE8713979U 1987-10-17
DE8713979 1987-10-17
DE8716386U DE8716386U1 (de) 1987-10-17 1987-12-11 Druckluftbetätigter Meißelhammer
DE8716386U 1987-12-11

Publications (2)

Publication Number Publication Date
EP0312831A1 EP0312831A1 (fr) 1989-04-26
EP0312831B1 true EP0312831B1 (fr) 1993-03-31

Family

ID=25952131

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88116441A Expired - Lifetime EP0312831B1 (fr) 1987-10-17 1988-10-05 Dispositif de protection contre les vibrations pour marteau burineur pneumatique

Country Status (2)

Country Link
EP (1) EP0312831B1 (fr)
DE (2) DE8716386U1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU680296B2 (en) * 1993-09-16 1997-07-24 Milleen Constructions Pty Ltd Piling bell
WO1995008674A1 (fr) * 1993-09-16 1995-03-30 Milleen Constructions Pty. Ltd. Cloche a enfoncer les pieux

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1451102A (en) * 1922-04-17 1923-04-10 Philip T Ulmer Nonvibratory tool guide
US2929361A (en) * 1957-08-09 1960-03-22 Ingersoll Rand Co Buffer
SU604675A2 (ru) * 1975-08-13 1978-04-30 Всесоюзный Научно-Исследовательский И Проектно-Конструкторский Институт Механизированного И Ручного Строительно-Монтажного Инструмента,Вибраторов И Строительно-Отделочных Машин Машина ударного действи
DE3520036A1 (de) * 1985-06-04 1986-12-04 "F. u. K." Frölich & Klüpfel Drucklufttechnik GmbH & Co KG, 5600 Wuppertal Schriftenhammer
SE452426B (sv) * 1985-06-19 1987-11-30 Eskil Sundstrom Vibrationsdempande handtag

Also Published As

Publication number Publication date
EP0312831A1 (fr) 1989-04-26
DE3879861D1 (de) 1993-05-06
DE8716386U1 (de) 1988-02-11

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