EP0312831B1 - Vibration isolator for a pneumatic chiselling hammer - Google Patents
Vibration isolator for a pneumatic chiselling hammer Download PDFInfo
- 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
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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.
Description
Die Erfindung betrifft einen Vibrationsschutz bei einem druckluftbetätigten Meißelhammer nach dem Oberbegriff des Anspruches 1.The invention relates to vibration protection in a pneumatic hammer chisel according to the preamble of
Meißelhämmer weisen einen Zylinder auf, der mit einem Pistolenhandgriff verbunden ist. Am Zylinder ist eine axial verlaufende Aufnahmebohrung zur Aufnahme des hinteren Endes des Meißelschaftes vorgesehen. Der in der Zylinderbohrung hin und her bewegbare Kolben überträgt seine Bewegungsenergie auf den Meißel. Bei der Durchführung von Steinmetzarbeiten wird der Meißel mit der einen Hand geführt, während die andere Hand den Pistolenhandgriff hält. Die Vibrationen des Meißels werden dabei auf die meißelführende Hand übertragen, was zu Durchblutungsstörungen und bleibenden Schäden bei der meißelführenden Hand führt. Arbeiten mit einem solchen Meißelhammer dürfen daher maximal 10 Minuten pro Tag ausgeführt werden.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. When performing stonework, 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.
Die DE-OS 35 20 036 hat einen druckluftbetätigten Meißelhammer mit einem Vibrationsschutz zum Inhalt. Bei diesem Meißelhammer ist eine den Meißelschaft umgebende Schutzhülse vorgesehen, welche über eine Schnellkupplung mit dem Zylinder verbindbar ist. Im Innern dieser Schutzhülse stützt sich eine Wendelfeder ab, deren anderes Ende gegen einen Dämpfungsring anliegt. Am gegenüberliegenden Ende dieser Schulter ist im Zylinder eine hin- und herbewegbar gelagerte Buchse vorgesehen, die sich über einen weiteren Dämpfungsring an einer Schulter des Zylinders abstützt.DE-OS 35 20 036 has a pneumatic hammer chisel with vibration protection for the content. In this chisel hammer, 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. At the opposite end of this shoulder, a reciprocating bushing is provided in the cylinder, which is supported by a further damping ring on a shoulder of the cylinder.
Schlägt der Kolben gegen die hintere Schlagfläche des Meißelschaftes an, dann wird der Meißel entgegen der Kraft der Wendelfeder nach vorne bewegt. Die Schlagbewegung wird hierbei durch die Feder und den zwischen dem Meißelschaft angeordneten Dämpfungsring gedämpft. Bei der Rückwärtsbewegung des Meißels erfolgt eine entsprechende Dämpfung durch den zwischen der Buchse und dem Zylinder angeordneten Dämpfungsring. Der Meißel wird hierbei über die Schutzhülse geführt.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.
Hierdurch wird erreicht, daß die Vibrationen des Meißels auf die meißelführende Hand nur gedämpft übertragen werden. Nachteilig ist jedoch der komplizierte Aufbau und die Verschleißanfälligkeit der Teile, insbesondere der Dämpfungsringe und der Anschlagbereiche zwischen dem Meißelschaft und der Buchse.This ensures that the vibrations of the chisel are only transmitted to the chisel-guiding hand in a damped manner. However, the complicated structure and the susceptibility to wear of the parts, in particular the damping rings and the stop areas between the chisel shaft and the bushing, are disadvantageous.
Da bei Steinmetzarbeiten Meißel mit unterschiedlichen Schneidbreiten eingesetzt werden müssen, ist es bei dem bekannten Meißelhammer erforderlich, mehrere Schutzhülsen mit Meißeln unterschiedlicher Schneidbreiten bereitzuhalten. Dieser Nachteil ist insbesondere bedeutsam, da die Schutzhülsen mit Mitnahmehülsen und Dämpfungsringen relativ teuer sind. Um diese Kosten zu sparen, kann nur eine Schutzhülse verwendet werden und die Meißel werden gegeneinander ausgetauscht. Um einen Meißelaustausch jedoch vornehmen zu können, ist es erforderlich, die Schutzhülse vom Zylinder zu entfernen, da der Meißel nur nach hinten aus der Schutzhülse entfernbar ist. Dies führt zu einem weiteren Nachteil der bekannten Konstruktion. Da der Meißel nur nach hinten aus der Schutzhülse entfernt werden kann, entspricht die maximal mögliche Schneidbreite des Meißels dem Innendurchmesser der Schutzhülse.Since chisels with different cutting widths must be used in stonemasonry work, it is necessary in the known chisel hammer to have several protective sleeves with chisels of different cutting widths ready. This disadvantage is particularly significant since the protective sleeves with driving sleeves and damping rings are relatively expensive. To save these costs, only a protective sleeve can be used and the chisels are exchanged for one another. However, in order to be able to replace the chisel, it is necessary to remove the protective sleeve from the cylinder, since the chisel can only be removed from the rear of the protective sleeve. This leads to a further disadvantage of the known construction. Since the chisel can only be removed from the back of the protective sleeve, the maximum possible cutting width of the chisel corresponds to the inside diameter of the protective sleeve.
Eine Vibrationsschutz vorrichtung der eingangs genannten Art ist Gegenstand der US-A 29 29 361. Das Zwischenstück weist an seinem anderen Ende eine Aufnahmebohrung zur Aufnahme des hinteren Endes von Meißelschäften auf, deren Meißel unterschiedliche Schneidbreiten haben können. Zwischen dem Zylindergehäuse und der von einem zylindrischen Teil gebildeten Aufnahmebohrung für das Zwischenstück ist ein aus Gummi bestehendes zylindrisches Dämpfungsteil angeordnet, das die Übertragung von Vibrationen auf das Gehäuse dämpft, nicht jedoch die Übertragung solcher Vibrationen auf das Zwischenstück und den Meißelschaft. Dieses Dämpfungsteil ist jedoch ein Verschleißteil, da es bei der Arbeitsbewegung des Kolbens Scherkräften unterworfen ist. Um die Übertragung von Vibrationen auf die meißelführende Hand zu dämpfen, weist das Zwischenstück einen quer zu seiner Achse verlaufenden, eine Gummihülse tragenden Handgriff auf. Mit einem solchen Handgriff kann jedoch der Meißel nicht exakt geführt werden.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. Between the cylinder housing and the receiving bore for the intermediate piece, which is formed by a cylindrical part, 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. However, this damping part is a wearing part because it is subjected to shear forces during the working movement of the piston. 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. However, the chisel cannot be guided exactly with such a handle.
Es besteht die Aufgabe, die Vibrationsschutz vorrichtung des Meißelhammers so zu vereinfachen, daß Verschleißteile vermieden werden und handelsübliche Meißelhammer ohne Umrüstung verwendbar sein sollen.There is the task of simplifying the vibration protection device of the chisel hammer so that wearing parts are avoided and standard chisel hammer should be usable without retrofitting.
Gelöst wird diese Aufgabe mit den kennzeichnenden Merkmalen des Anspruches 1. Vorteilhafte Ausgestaltungen sind den Unteransprüchen entnehmbar.This object is achieved with the characterizing features of
Zwei Ausführungsbeispiele werden nachfolgend anhand der Zeichnungen näher erläutert. Es zeigen:
- Fig. 1
- einen Längsschnitt durch ein erstes Ausführungsbeispiel und
- Fig. 2
- einen Längsschnitt durch ein zweites Ausführungsbeispiel.
- Fig. 1
- a longitudinal section through a first embodiment and
- Fig. 2
- a longitudinal section through a second embodiment.
Der Zylinder 1 des Meißelhammers weist eine Zylinderbohrung 2 auf, in welchem der nicht dargestellte Kolben hin- und herbewegbar ist. Weiterhin ist dieser Zylinder mit einer Aufnahmebohrung 3 versehen, welche normalerweise zur Aufnahme des hinteren Endes des Meißelschaftes dient. Der Zylinder 1 ist mit einem Pistolenhandgriff verbunden. Der vorbeschriebene Aufbau ist bekannt. In diese Aufnahmebohrung 3 ist eingesetzt das Schaftstück 4 eines Zwischenstücks 5. An seinem anderen Ende ist dieses Zwischenstück 5 mit einer Aufnahmebohrung 6 versehen, welche das hintere Ende 7 des Meißelschaftes 8 aufnimmt. Im gezeigten Ausführungsbeispiel sind die Aufnahmebohrung 6 und das hintere Ende 7 jeweils keilförmig ausgebildet, so daß sich das hintere Ende 7 in der Bohrung 6 verkeilt. Im Bereich der Meißelspitze 13 weist der Meißelschaft 8 einen Anschlag 14 auf, gegen den der vordere Rand der Schutzhülse 12 als Anschlag 15 zur Anlage kommt. Die zwischen den Schultern 9, 11 angeordnete Wendelfeder ist auf Druck beansprucht und drückt somit die Hülse 12 gegen den Anschlag 14.The
Die Hülse 12, die mit einem Mantel aus einem elastischen Material umhüllt sein kann oder selbst aus einem solchen Material besteht, dient zur Führung des Meißels. Das Zwischenstück 5, der Meißel und die Hülse 12 bilden eine Baueinheit. Diese Baueinheit kann durch Herausziehen aus der Aufnahmebohrung 3 leicht gegen eine andere Baueinheit ausgetauscht werden. Ist der Meißel nicht mehr brauchbar, dann wird sein hinteres Ende 7 aus der Bohrung 6 entfernt und in diese Bohrung 6 ein neuer Meißel eingesetzt, auf den zuvor die Hülse 12 aufgesetzt wurde.The
Es hat sich gezeigt, daß über die Hülse 12 praktisch keine Vibrationen übertragen werden, da die Hülse 12 frei beweglich den Meißelschaft 8 umgibt.It has been shown that practically no vibrations are transmitted via the
Um die Meißelspitze 13 über die Hülse 12 einwandfrei führen zu können, kann zwischen dem Schaft 8 und der Hülse 12 eine Verdrehsicherung vorgesehen sein. Um das Ansetzen der Meißelspitze 13 über die Hülse 12 zu erleichtern, kann eine Wendelfeder 10 vorgesehen sein, die zwischen einer die Bohrung 6 umgebenden Anlageschulter 9 des Zwischenstücks 5 und der hinteren Schulter 11 der Hülse 12 sich abstützt. Diese Feder 10 drückt die Hülse 12 in Richtung der Meißelspitze 13.In order to be able to properly guide the
Das Zwischenstück 5, die Feder 10 und die Hülse 12 unterliegen keinem Verschleiß. Bei Verwendung der Feder 10 kann zwischen dem Anschlag 15 der Hülse 12 und dem Anschlag 14 am Meißelschaft 8 ein elastisches Zwischenteil 16 vorgesehen sein.The intermediate piece 5, the
Ein bevorzugtes Ausführungsbeispiel zeigt die Fig. 2. Bei dieser Ausführungsform ist die Schutzhülse nach hinten verlängert und weist ein Hülsenteil 17 auf, das das Zwischenstück 5 umgibt. Die Wendelfeder 10 ist zwischen einer Schulter 9' am Zwischenstück 5 und einer Schulter 11' am vorderen Ende des Hülsenteils 17 angeordnet. Das Hülsenteil 17 weist hinten eine Ringschulter 18 auf, die einen Anschlag 15' bildet und die von der Feder gegen die hintere Ringschulter am Zwischenstück 5 gedrückt wird, die als Anschlag 14' dient. Die Ringschulter am Zwischenstück und die Ringschulter 18 haben somit die gleiche Aufgabe wie der vordere Rand 15 und der Anschlag 14 nach Fig. 1.A preferred exemplary embodiment is shown in FIG. 2. In this embodiment, the protective sleeve is extended to the rear and has a
Zwischen den Anschlägen 14', 15' kann ein elastischer Ring, entsprechend dem Ring 16 angeordnet sein. Bevorzugt besteht die Schutzhülse 12 mit dem Hülsenteil 17 und der Ringschulter 18 aus einem gummielastischen Material.An elastic ring corresponding to the
Um den Meißel aus der weiteren Aufnahmebohrung 6 austreiben zu können, weist das Zwischenstück 5 einen seitlichen Schlitz 19 auf, zu dem ein weiterer Schlitz 20 am Hülsenteil 17 deckungsgleich ist. Der Schlitz 19 mündet am hinteren Ende in der weiteren Aufnahmebohrung 6. Über die Schlitze 19, 20 kann ein Keilstück eingesetzt werden, womit der Meißel aus der Aufnahmebohrung 6 gedrückt werden kann.In order to be able to drive the chisel out of the further receiving bore 6, the intermediate piece 5 has a
Die Ausführungsform nach Fig. 2 weist den zusätzlichen Vorteil auf, daß ein handelsüblicher Meißel verwendet werden kann, der keinen Anschlag entsprechend dem Anschlag 14 nach Fig. 1 aufweisen muß. Bei der Ausführungsform nach Fig. 2 ist die Schulter 9' am Zwischenstück 5 vom vorderen Ende nach hinten versetzt, so daß die Wendelfeder relativ lang und somit weich ausgeführt werden kann. Zwischen dem Zwischenstück 5 und dem Hülsenteil 17 ist wiederum bevorzugt eine Verdrehsicherung angeordnet.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
Claims (10)
- A device for protection against vibration in the case of a chisel-hammer actuated by compressed air and having a cylinder (1) and a piston which is able to move to and fro in a cylinder bore (2) and the energy of motion of which is transmitted to the shank (8) of the chisel, where the cylinder (1) exhibits a receiver-bore (3) running axially for receiving the rear end of a piece (4) of the shank of an intermediate piece (5) and the intermediate piece (5) exhibits at the other end of it a further receiver bore (6) for receiving the rear end (7) of the shank (8) of the chisel, characterized in that a protective sleeve (12) is provided, surrounding the shank (8) of the chisel, the protective sleeve (12) surrounds the shank (8) of the chisel loosely and able to move freely, and stops (14, 14', 15, 15') are provided at one side on the protective sleeve (12) and at the other side on the shank (8) of the chisel or respectively on the intermediate piece (5), which limit the ability of the protective sleeve (12) to move relatively to the shank (8) of the chisel in the direction of the tip (13) of the chisel.
- A device as in Claim 1, characterized in that
a spiral spring (10) is arranged between the intermediate piece (5) and the protective sleeve (12) and holds the stops (14, 14', 15, 15') against one another. - A device as in Claim 1 or 2, characterized in that
the further receiver bore (6) and the rear end (7) of the shank (8) of the chisel are made wedge-shaped. - A device as in one of the Claims 1 to 3, characterized in that the protective sleeve (12) is arranged on the shank (8) of the chisel to be secure against twisting.
- A device as in one of the Claims 1 to 4, characterized in that
the stops (14, 15) are provided at one side on the tip (13) of the chisel and at the other side on the front end of the protective sleeve (12). - A device as in one of the Claims 1 to 4, characterized in that
the protective sleeve (12) exhibits one part (17) of the sleeve overlapping the intermediate piece (5) and having an annular shoulder (18) which serves as a stop (15') and cooperates with a stop (14') made as an annular shoulder on the intermediate piece (5). - A device as in Claim 5 or 6, characterized in that
the spiral spring (10) is arranged between a stop shoulder (9, 9') on the intermediate piece (5) and a shoulder (11, 11') on the protective sleeve (12) and forces the protective sleeve (12) in the direction of the tip (13) of the chisel. - A device as in one of the Claims 1 to 7, characterized in that
the intermediate piece (5) exhibits a slot (19) at the side, running to the rear end of the further receiver bore (6). - A device as in Claim 8, characterized in that
the part (17) of the sleeve exhibits a further slot (20) in line with the slot (19) in the intermediate piece (5). - A device as in one of the Claims 1 to 9, characterized in that the protective sleeve (12) consists of an elastic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT88116441T ATE87527T1 (en) | 1987-10-17 | 1988-10-05 | ANTI-VIBRATION DEVICE ON AN AIR ACTUATED CHISEL HAMMER. |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE8713979 | 1987-10-17 | ||
| DE8713979U | 1987-10-17 | ||
| DE8716386U DE8716386U1 (en) | 1987-10-17 | 1987-12-11 | |
| DE8716386U | 1987-12-11 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0312831A1 EP0312831A1 (en) | 1989-04-26 |
| EP0312831B1 true EP0312831B1 (en) | 1993-03-31 |
Family
ID=25952131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88116441A Expired - Lifetime EP0312831B1 (en) | 1987-10-17 | 1988-10-05 | Vibration isolator for a pneumatic chiselling hammer |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0312831B1 (en) |
| DE (2) | DE8716386U1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU680296B2 (en) * | 1993-09-16 | 1997-07-24 | Milleen Constructions Pty Ltd | Piling bell |
| WO1995008674A1 (en) * | 1993-09-16 | 1995-03-30 | Milleen Constructions Pty. Ltd. | Piling bell |
Family Cites Families (5)
| 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 (en) * | 1975-08-13 | 1978-04-30 | Всесоюзный Научно-Исследовательский И Проектно-Конструкторский Институт Механизированного И Ручного Строительно-Монтажного Инструмента,Вибраторов И Строительно-Отделочных Машин | Impact-action machine |
| DE3520036A1 (en) * | 1985-06-04 | 1986-12-04 | "F. u. K." Frölich & Klüpfel Drucklufttechnik GmbH & Co KG, 5600 Wuppertal | Inscription hammer |
| SE452426B (en) * | 1985-06-19 | 1987-11-30 | Eskil Sundstrom | VIBRATION DUMPING HANDLE |
-
1987
- 1987-12-11 DE DE8716386U patent/DE8716386U1/de not_active Expired
-
1988
- 1988-10-05 DE DE8888116441T patent/DE3879861D1/en not_active Expired - Lifetime
- 1988-10-05 EP EP88116441A patent/EP0312831B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0312831A1 (en) | 1989-04-26 |
| DE8716386U1 (en) | 1988-02-11 |
| DE3879861D1 (en) | 1993-05-06 |
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