EP2205403B1 - Chisel, particularly for motor-driven machines - Google Patents

Chisel, particularly for motor-driven machines Download PDF

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Publication number
EP2205403B1
EP2205403B1 EP08786510.1A EP08786510A EP2205403B1 EP 2205403 B1 EP2205403 B1 EP 2205403B1 EP 08786510 A EP08786510 A EP 08786510A EP 2205403 B1 EP2205403 B1 EP 2205403B1
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EP
European Patent Office
Prior art keywords
chisel
working
working portion
longitudinal axis
section
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EP08786510.1A
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German (de)
French (fr)
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EP2205403A1 (en
Inventor
Massimo Anghileri
Fabrizio Sanna
Cristian Falchetti
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2205403A1 publication Critical patent/EP2205403A1/en
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    • 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
    • B25D17/02—Percussive tool bits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/305—Twisted part of a chisel or percussive non-drilling tool bit

Definitions

  • the invention relates to a chisel, in particular for motor-driven machines according to the preamble of claim 1.
  • a chisel is known from DE 463 571 known.
  • a pointed chisel which has a utility area, wherein the chisel in the utility area has a trained as a polygon cross-section.
  • a disadvantage of such chisels is their tendency to get stuck in this at a deep penetration into a material to be shredded or to jam or wed in this. Furthermore, it is considered disadvantageous that pieces of rock which are knocked off by the chisel are guided by the profile of the utilization area in the direction of a person handling the chisel.
  • the invention has for its object to develop a chisel, which counteracts a sticking or jamming or wedging in the material against a deeper penetration into a material and counteracts a danger to the person handling the chisel by severed pieces of rock.
  • the chisel according to the invention has at its second Working section along the longitudinal axis of the chisel on successive, perpendicular to the longitudinal axis cross-sectional surfaces, wherein successive cross-sectional areas are arranged around the longitudinal axis of the bit twisted to each other.
  • the bit also acts with rotational forces on the material to be machined when penetrating the second working section penetrates into the material to be machined.
  • side walls of the channel which creates the bit when penetrating into the material to be machined, worn or damaged and are thus less suitable to pinch the chisel.
  • the twisted design of the second working section causes a deflection of rock parts.
  • Core of the invention is the arrangement of a twisted second working portion between the first working portion and the connecting portion, the twisted second working portion counteracts by its destructive effect jamming in the material to be processed and also deflects rock parts that move in the direction of the person handling the chisel.
  • the bit is designed as a pointed chisel, wherein the first working portion is formed by a pyramidal or conical tip. Chisels with such pointed tips are particularly suitable for penetrating deeply into a material, since the penetration initially behave like a nail.
  • the invention provides a cylindrical embodiment of the second working section.
  • a deep penetration of the bit into a material to be machined is favored, since no additional resistances of the material to be processed have to be overcome by the shape of the second working section.
  • the chisel optimally adapted to the material to be machined, the motor or pneumatically driven machine used and the desired penetration.
  • the invention further provides to make a diameter of the connecting portion and a diameter of an enveloping circle around the second working portion of the working end identical, to provide a stable transition between the second working portion and the connecting portion, which is not weakened by notch effects.
  • a penetration of the connecting portion in the material to be machined is possible without a fracture of the chisel is to be feared.
  • the invention provides, in particular, for the second working section of the working end to be designed as a splined shaft profile in each cross-section perpendicular to the longitudinal axis of the pointed chisel.
  • Such a profiling can be easily manufactured manufacturing technology.
  • the invention provides to provide the first working section, which forms the tip of the pointed chisel, with an untwisted surface. This will the penetration of the first working section, which forms a cutting edge, facilitates in the material to be processed.
  • the first working portion is formed in a front, emanating from the cutting tip area as a conical shell or pyramidal with a smooth and groove-free surface.
  • the pointed chisel in working mode with the first working section and approximately a front half of its second working section into material to be machined. This comparatively deep penetration of the chisel makes rapid work progress possible.
  • the invention provides a plurality of grooves which circumscribe the second working portion of the working end of the pointed chisel.
  • congruent cross-sectional areas are understood as meaning those cross-sectional areas which are embodied in a plane perpendicular to the longitudinal axis of the bit and which are congruent to one another.
  • a congruence of conformity can be achieved after a rotation of a cross-sectional area about the longitudinal axis of the bit.
  • motor-driven machines are to be understood as meaning, in particular, electrically and / or pneumatically driven machines.
  • FIGS. 1a to 1c show a side view and two sectional views of a bit according to the invention.
  • FIGS. 2a to 2c show a side view and two sectional views of a non-inventive bit.
  • FIGS. 3a to 3c show three variants of chisels according to the invention in side view.
  • FIG. 1a an inventive chisel 1 is shown in side view.
  • the bit 1 is clamped in a direction indicated by dashed lines motor-driven machine 2 with a spigot 3.
  • the insertion end 3 is connected via a connecting portion 4 with a working end. 5 connected.
  • the working end 5 is composed of a first working section 6 and a second working section 7.
  • the bit 1 is designed as a pointed chisel 8, wherein the first working portion 6 is formed by a conical or pyramidal tip 9 with a cutting tip 10.
  • the bit 1 has a longitudinal axis 11 which extends through the cutting tip 10.
  • FIG. 1b is a section through the second working portion 7 of the chisel 1 according to the in the FIG.
  • the second working section 7 is formed in the section running perpendicular to the longitudinal axis 11 as a cross-sectional area A of a splined shaft profile 12, which is determined by four grooves 13a, 13b, 13c and 13d.
  • the grooves 13a, 13b, 13c and 13d orbit the second working section 7 spirally (see FIG FIG. 1a ).
  • the second working section 7 of the working end 5 is designed as a spiral section.
  • a further section Ic-Ic which is executed parallel to the section Ib-Ib (see Figure 1c ), a cross-sectional area B, which is aligned with respect to the cross-sectional area A rotated about the longitudinal axis 11.
  • the second working section 7 has a length L7, which is at least a quarter of a length L1 of the chisel 1.
  • the diameter D7 of the enveloping circle HK7 corresponds to a diameter D4 of the connecting portion 4.
  • the grooves 13a, 13b, 13c and 13d extend parallel to the longitudinal axis 11 into the first working portion 6 and the conical tip 9, respectively.
  • the second working portion 7 of the working end 5 has a length L7 and the first working portion 6 of the working end 5 has a length L6.
  • L7 > 2 x L6.
  • the grooves 13a, 13b, 13c and 13d extend from the second working section 7 into the connecting section 4 parallel to the longitudinal axis 11.
  • FIG. 2a a non-inventive chisel 1 is shown in side view.
  • An insertion end 3 of the bit is connected via a connecting portion 4 with a working end 5.
  • the working end 5 is composed of a first working section 6 and a second working section 7.
  • the bit 1 is designed as a flat chisel 14, wherein the first working portion 6 is formed by a wedge-shaped tip 15 in side view from an arrow direction y.
  • the wedge-shaped tip 15 has a cutting edge 16.
  • the bit 1 has a longitudinal axis 11 which extends through the cutting edge 16.
  • FIG. 2b is a section through the second working portion 7 of the chisel 1 according to the in the FIG. 2a shown section line IIb-IIb shown.
  • the second working section 7 is formed in the section running perpendicular to the longitudinal axis 11 as a cross-sectional area C of a flat profile 20 which is determined on an upper side 17 and a lower side 18 by three ribs 19a, 19b, 19c and 19d, 19e, 19f, respectively.
  • a further section IIc-IIc which is executed parallel to the section IIb-IIb (see Figure 2c ) has a cross-section D of the flat profile 20 in a relation to the cross-section C rotated by 90 ° position.
  • FIGS. 3a to 3c show three embodiments of chisels 1 according to the invention with different diameters D4.
  • a working section 7 is corresponding to that in the FIG. 1a shown chisel formed as a spiral section, said spiral section of grooves 13a to 13d in the in the FIGS. 3a to 3c shown chisels 1 to a cutting tip 10 towards changing slopes S73, S72 and S71.
  • the value of a pitch angle to the cutting tip 10 increases from a value ⁇ 1 over a value ⁇ 2 to a value ⁇ 3.
  • a change in the pitch angle takes place in the in the FIGS. 3a to 3c shown chisels 1 with continuous, non-erratic transitions.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Description

Die Erfindung betrifft einen Meißel insbesondere für motorgetriebene Maschinen gemäß dem Oberbegriff des Anspruchs 1. Ein solcher Meißel ist aus der DE 463 571 bekannt.The invention relates to a chisel, in particular for motor-driven machines according to the preamble of claim 1. Such a chisel is known from DE 463 571 known.

Stand der TechnikState of the art

Aus der DE 102 44 509 A1 ist ein Spitzmeißel bekannt, welcher einen Nutzungsbereich aufweist, wobei der Spitzmeißel in dem Nutzungsbereich einen als Polygon ausgebildeten Querschnitt aufweist. Nachteilig an derartigen Meißeln ist deren Neigung bei einem tiefen Eindringen in ein zu zerkleinerndes Material in diesem stecken zu bleiben bzw. sich in diesem zu verklemmen bzw. zu verkeilen. Weiterhin wird es als nachteilig angesehen, dass Gesteinsteile, welche durch den Meißel abgeschlagen werden von dem Profil des Nutzungsbereichs in Richtung einer den Meißel handhabenden Person geleitet werden.From the DE 102 44 509 A1 is known a pointed chisel, which has a utility area, wherein the chisel in the utility area has a trained as a polygon cross-section. A disadvantage of such chisels is their tendency to get stuck in this at a deep penetration into a material to be shredded or to jam or wed in this. Furthermore, it is considered disadvantageous that pieces of rock which are knocked off by the chisel are guided by the profile of the utilization area in the direction of a person handling the chisel.

Offenbarung der ErfindungDisclosure of the invention

Der Erfindung liegt die Aufgabe zugrunde, einen Meißel zu entwickeln, welcher auch bei einem tieferen Eindringen in ein Material einem Steckenbleiben bzw. Verklemmen bzw. Verkeilen in dem Material entgegen wirkt und einer Gefährdung einer den Meißel handhabenden Person durch abgeschlagene Gesteinsteile entgegenwirkt.The invention has for its object to develop a chisel, which counteracts a sticking or jamming or wedging in the material against a deeper penetration into a material and counteracts a danger to the person handling the chisel by severed pieces of rock.

Diese Aufgabe wird durch den unabhängigen Anspruch 1 gelöst. Vorteilhafte Ausführungsformen sind in den abhängigen Ansprüchen offenbart. Der erfindungsgemäße Meißel weist an seinem zweiten Arbeitsabschnitt entlang der Längsachse des Meißels aufeinanderfolgende, senkrecht zu der Längsachse stehende Querschnittsflächen auf, wobei aufeinaderfolgende Querschnittsflächen um die Längsachse des Meißels verdreht zueinander angeordnet sind. Hierdurch wirkt der Meißel beim Eindringen auch mit Drehkräften auf das zu bearbeitende Material, wenn der zweite Arbeitsabschnitt in das zu bearbeitende Material eindringt. Durch diese Drehkräfte werden Seitenwände des Kanals, welchen sich der Meißel beim Eindringen in das zu bearbeitende Material schafft, abgetragen bzw. beschädigt und sind hierdurch weniger geeignet den Meißel einzuklemmen. Gleichzeitig bewirkt die verdrehte Gestaltung des zweiten Arbeitsabschnitts eine Ablenkung von Gesteinsteilen. Kern der Erfindung ist die Anordnung eines verdrillten zweiten Arbeitsabschnitts zwischen dem ersten Arbeitsabschnitt und dem Verbindungsabschnitt, wobei der verdrillte zweite Arbeitsabschnitt durch seine zerstörerische Wirkung einem Verklemmen im zu bearbeitenden Material entgegenwirkt und zusätzlich Gesteinsteile ablenkt, die sich in Richtung der den Meißel handhabenden Person bewegen. Erfindungsgemäß ist der Meißel als Spitzmeißel ausgebildet, wobei der erste Arbeitsabschnitt durch eine pyramidenförmige oder kegelartige Spitze gebildet ist. Meißel mit derartig ausgeführten Spitzen sind besonders dafür geeignet, tief in ein Material einzudringen, da sich beim Eindringen zunächst ähnlich wie ein Nagel verhalten. Weiterhin sieht die Erfindung eine zylinderförmige Ausführung des zweiten Arbeitsabschnitts vor. Hierdurch wird im Gegensatz zu einem konisch ausgebildeten zweiten Arbeitsabschnitt ein tiefes Eindringen des Meißels in ein zu bearbeitendes Material begünstigt, da durch die Form des zweiten Arbeitsabschnitts keine zusätzlichen Widerstände des zu bearbeitenden Materials überwunden werden müssen. Erfindungsgemäß verläuft in dem zweiten Arbeitsabschnitt zwischen dem ersten Arbeitsabschnitt und dem Verbindungsabschnitt des Spitzmeißels wenigstens eine Nut schraubenlinienförmig um die Längsachse des Spitzmeißels, wobei die Nut einen Steigungswinkel zwischen α = 2° und α = 70° aufweist, welcher insbesondere bei α = 33° liegt. Zum Beispiel ist es durch die Zahl der Nuten und deren Steigungswinkel möglich, den Meißel optimal auf das zu bearbeitende Material, die verwendete motor- bzw. pneumatisch angetriebene Maschine und das gewünschte Eindringverhalten anzupassen.This object is solved by the independent claim 1. Advantageous embodiments are disclosed in the dependent claims. The chisel according to the invention has at its second Working section along the longitudinal axis of the chisel on successive, perpendicular to the longitudinal axis cross-sectional surfaces, wherein successive cross-sectional areas are arranged around the longitudinal axis of the bit twisted to each other. As a result, the bit also acts with rotational forces on the material to be machined when penetrating the second working section penetrates into the material to be machined. By these rotational forces side walls of the channel, which creates the bit when penetrating into the material to be machined, worn or damaged and are thus less suitable to pinch the chisel. At the same time the twisted design of the second working section causes a deflection of rock parts. Core of the invention is the arrangement of a twisted second working portion between the first working portion and the connecting portion, the twisted second working portion counteracts by its destructive effect jamming in the material to be processed and also deflects rock parts that move in the direction of the person handling the chisel. According to the invention, the bit is designed as a pointed chisel, wherein the first working portion is formed by a pyramidal or conical tip. Chisels with such pointed tips are particularly suitable for penetrating deeply into a material, since the penetration initially behave like a nail. Furthermore, the invention provides a cylindrical embodiment of the second working section. In this way, in contrast to a conically shaped second working section, a deep penetration of the bit into a material to be machined is favored, since no additional resistances of the material to be processed have to be overcome by the shape of the second working section. According to the invention runs in the second working section between the first working section and the Connecting portion of the pointed chisel at least one groove helically around the longitudinal axis of the chisel, wherein the groove has a pitch angle between α = 2 ° and α = 70 °, which in particular is α = 33 °. For example, it is possible by the number of grooves and their pitch angle, the chisel optimally adapted to the material to be machined, the motor or pneumatically driven machine used and the desired penetration.

Die Erfindung sieht weiterhin vor, einen Durchmesser des Verbindungsabschnitts und einen Durchmesser eines Hüllkreises um den zweiten Arbeitsabschnitt des Arbeitsendes identisch auszuführen, um einen stabilen Übergang zwischen dem zweiten Arbeitsabschnitt und dem Verbindungsabschnitt zu schaffen, welcher nicht durch Kerbwirkungen geschwächt ist. Somit ist notfalls auch ein Eindringen des Verbindungsabschnitts in das zu bearbeitende Material möglich, ohne dass ein Bruch des Meißels zu befürchten ist.The invention further provides to make a diameter of the connecting portion and a diameter of an enveloping circle around the second working portion of the working end identical, to provide a stable transition between the second working portion and the connecting portion, which is not weakened by notch effects. Thus, if necessary, a penetration of the connecting portion in the material to be machined is possible without a fracture of the chisel is to be feared.

Die Erfindung sieht insbesondere vor, den zweiten Arbeitsabschnitt des Arbeitsendes in jedem Querschnitt senkrecht zu der Längsachse des Spitzmeißels als Keilwellenprofil auszubilden. Eine derartige Profilierung lässt sich fertigungstechnisch einfach herstellen.The invention provides, in particular, for the second working section of the working end to be designed as a splined shaft profile in each cross-section perpendicular to the longitudinal axis of the pointed chisel. Such a profiling can be easily manufactured manufacturing technology.

Weiterhin sieht die Erfindung vor, den ersten Arbeitsabschnitt, welcher die Spitze des Spitzmeißels bildet, mit einer unverdrillten Oberfläche zu versehen. Hierdurch wird das Eindringen des ersten Arbeitsabschnitts, welcher eine Schneide bildet, in das zu bearbeitende Material erleichtert. Insbesondere ist der erste Arbeitsabschnitt in einem vorderen, von der Schneidspitze ausgehenden Bereich als Kegelmantel oder pyramidenförmig mit einer glatten und rillenfreien Oberfläche ausgebildet.Furthermore, the invention provides to provide the first working section, which forms the tip of the pointed chisel, with an untwisted surface. This will the penetration of the first working section, which forms a cutting edge, facilitates in the material to be processed. In particular, the first working portion is formed in a front, emanating from the cutting tip area as a conical shell or pyramidal with a smooth and groove-free surface.

Erfindungsgemäß ist es vorgesehen, den Spitzmeißel im Arbeitsbetrieb mit dem ersten Arbeitsabschnitt und etwa einer vorderen Hälfte seines zweiten Arbeitsabschnitts in zu bearbeitendes Material einzuschlagen. Durch dieses vergleichsweise tiefe Eindringen des Meißels ist ein rascher Arbeitsfortschritt möglich.According to the invention, it is provided to strike the pointed chisel in working mode with the first working section and approximately a front half of its second working section into material to be machined. This comparatively deep penetration of the chisel makes rapid work progress possible.

Insbesondere sieht die Erfindung mehrere Nuten vor, welche den zweiten Arbeitsabschnitt des Arbeitsendes des Spitzmeißels umlaufen.In particular, the invention provides a plurality of grooves which circumscribe the second working portion of the working end of the pointed chisel.

Im Sinne der Erfindung werden unter kongruenten Querschnittsflächen solche Querschnittsflächen verstanden, welche in einer senkrecht zu der Längsachse des Meißels liegenden Ebene ausgeführt sind und welche deckungsgleich zueinander sind. Bei den fraglichen Querschnittsflächen des erfindungsgemäßen Meißels ist eine Deckungsgleichheit nach einer Drehung einer Querschnittsfläche um die Längsachse des Meißels erreichbar.For the purposes of the invention, congruent cross-sectional areas are understood as meaning those cross-sectional areas which are embodied in a plane perpendicular to the longitudinal axis of the bit and which are congruent to one another. With the cross-sectional areas in question of the bit according to the invention, a congruence of conformity can be achieved after a rotation of a cross-sectional area about the longitudinal axis of the bit.

Im Sinne der Erfindung sind unter motorgetriebenen Maschinen insbesondere elektrisch und/oder pneumatisch angetriebene Maschinen zu verstehen.For the purposes of the invention, motor-driven machines are to be understood as meaning, in particular, electrically and / or pneumatically driven machines.

Weitere Einzelheiten der Erfindung werden in der Zeichnung anhand von schematisch dargestellten Ausführungsbeispielen beschrieben.Further details of the invention are described in the drawing with reference to schematically illustrated embodiments.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Die Figuren 1a bis 1c zeigen einen Seitenansicht und zwei Schnittansichten eines erfindungsgemäßen Meißels.The FIGS. 1a to 1c show a side view and two sectional views of a bit according to the invention.

Die Figuren 2a bis 2c zeigen einen Seitenansicht und zwei Schnittansichten eines nicht-erfindungsgemäßen Meißels.The FIGS. 2a to 2c show a side view and two sectional views of a non-inventive bit.

Die Figuren 3a bis 3c zeigen drei Ausführungsvarianten von erfindungsgemäßen Meißeln in Seitenansicht.The FIGS. 3a to 3c show three variants of chisels according to the invention in side view.

Ausführungsformen der ErfindungEmbodiments of the invention

In der Figur 1a ist ein erfindungsgemäßer Meißel 1 in Seitenansicht dargestellt. Der Meißel 1 ist in eine mit gestrichelten Linien angedeutete motorgetriebene Maschine 2 mit einem Einsteckende 3 eingespannt. Das Einsteckende 3 ist über einen Verbindungsabschnitt 4 mit einem Arbeitsende 5 verbunden. Das Arbeitsende 5 setzt sich aus einem ersten Arbeitsabschnitt 6 und einem zweiten Arbeitsabschnitt 7 zusammen. Der Meißel 1 ist als Spitzmeißel 8 ausgeführt, wobei der erste Arbeitsabschnitt 6 durch eine kegelartige oder pyramidenförmige Spitze 9 mit einer Schneidspitze 10 gebildet ist. Der Meißel 1 weist eine Längsachse 11 auf, welche durch die Schneidspitze 10 verläuft. In der Figur 1b ist ein Schnitt durch den zweiten Arbeitsabschnitt 7 des Meißels 1 entsprechend der in der Figur 1a gezeigten Schnittlinie Ib-Ib gezeigt. Der zweite Arbeitsabschnitt 7 ist in dem senkrecht zu der Längsachse 11 verlaufenden Schnitt als Querschnittsfläche A eines Keilwellenprofils 12 ausgebildet, welches durch vier Nuten 13a, 13b, 13c und 13d bestimmt wird. Die Nuten 13a, 13b, 13c und 13d umlaufen den zweiten Arbeitsabschnitt 7 spiralförmig (siehe Figur 1a). Somit ist der zweite Arbeitsabschnitt 7 des Arbeitsendes 5 als Spiralabschnitt ausgeführt. Entsprechend zeigt ein weiterer Schnitt Ic-Ic, welcher parallel zu dem Schnitt Ib-Ib ausgeführt ist (siehe Figur 1c), eine Querschnittsfläche B, welche gegenüber der Querschnittsfläche A um die Längsachse 11 verdreht ausgerichtet ist. Die Nuten 13a, 13b, 13c und 13d weisen jeweils einen Steigungswinkel α auf, welcher sich aus einer Steigung S7 und einem Umfang U7 eines Hüllkreises HK7 um den zweiten Arbeitsabschnitt 7 errechnen lässt. Mit tan α = Π x D7 / S7 berechnet sich der Steigungswinkel a. Der zweite Arbeitsabschnitt 7 weist eine Länge L7 auf, welche wenigstens ein Viertel einer Länge L1 des Meißels 1 beträgt. Der Durchmesser D7 des Hüllkreises HK7 entspricht einem Durchmesser D4 des Verbindungsabschnitts 4. Die Nuten 13a, 13b, 13c und 13d laufen parallel zu der Längsachse 11 in den ersten Arbeitsabschnitt 6 bzw. die kegelartige Spitze 9 aus. Der zweite Arbeitsabschnitt 7 des Arbeitsendes 5 weist eine Länge L7 auf und der erste Arbeitsabschnitt 6 des Arbeitsendes 5 weist eine Länge L6 auf. Für die Längen L6 und L7 gilt L7 > 2 x L6. Die Nuten 13a, 13b, 13c und 13d laufen vom zweiten Arbeitsabschnitt 7 in den Verbindungsabschnitt 4 parallel zu der Längsachse 11 aus.In the FIG. 1a an inventive chisel 1 is shown in side view. The bit 1 is clamped in a direction indicated by dashed lines motor-driven machine 2 with a spigot 3. The insertion end 3 is connected via a connecting portion 4 with a working end. 5 connected. The working end 5 is composed of a first working section 6 and a second working section 7. The bit 1 is designed as a pointed chisel 8, wherein the first working portion 6 is formed by a conical or pyramidal tip 9 with a cutting tip 10. The bit 1 has a longitudinal axis 11 which extends through the cutting tip 10. In the FIG. 1b is a section through the second working portion 7 of the chisel 1 according to the in the FIG. 1a shown section line Ib-Ib shown. The second working section 7 is formed in the section running perpendicular to the longitudinal axis 11 as a cross-sectional area A of a splined shaft profile 12, which is determined by four grooves 13a, 13b, 13c and 13d. The grooves 13a, 13b, 13c and 13d orbit the second working section 7 spirally (see FIG FIG. 1a ). Thus, the second working section 7 of the working end 5 is designed as a spiral section. Accordingly, a further section Ic-Ic, which is executed parallel to the section Ib-Ib (see Figure 1c ), a cross-sectional area B, which is aligned with respect to the cross-sectional area A rotated about the longitudinal axis 11. The grooves 13a, 13b, 13c and 13d each have a pitch angle α, which can be calculated from a slope S7 and a circumference U7 of an enveloping circle HK7 about the second working section 7. With tan α = Π x D7 / S7, the pitch angle a is calculated. The second working section 7 has a length L7, which is at least a quarter of a length L1 of the chisel 1. The diameter D7 of the enveloping circle HK7 corresponds to a diameter D4 of the connecting portion 4. The grooves 13a, 13b, 13c and 13d extend parallel to the longitudinal axis 11 into the first working portion 6 and the conical tip 9, respectively. The second working portion 7 of the working end 5 has a length L7 and the first working portion 6 of the working end 5 has a length L6. For lengths L6 and L7, L7> 2 x L6. The grooves 13a, 13b, 13c and 13d extend from the second working section 7 into the connecting section 4 parallel to the longitudinal axis 11.

In der Figur 2a ist ein nicht-erfindungsgemäßer Meißel 1 in Seitenansicht dargestellt. Ein Einsteckende 3 des Meißels ist über einen Verbindungsabschnitt 4 mit einem Arbeitsende 5 verbunden. Das Arbeitsende 5 setzt sich aus einem ersten Arbeitsabschnitt 6 und einem zweiten Arbeitsabschnitt 7 zusammen. Der Meißel 1 ist als Flachmeißel 14 ausgeführt, wobei der erste Arbeitsabschnitt 6 durch eine in Seitenansicht aus einer Pfeilrichtung y keilförmige Spitze 15 gebildet ist. Die keilförmige Spitze 15 weist eine Schneidkante 16 auf. Der Meißel 1 weist eine Längsachse 11 auf, welche durch die Schneidkante 16 verläuft. In der Figur 2b ist ein Schnitt durch den zweiten Arbeitsabschnitt 7 des Meißels 1 entsprechend der in der Figur 2a gezeigten Schnittlinie IIb-IIb gezeigt. Der zweite Arbeitsabschnitt 7 ist in dem senkrecht zu der Längsachse 11 verlaufenden Schnitt als Querschnittsfläche C eines Flachprofils 20 ausgebildet, welches an einer Oberseite 17 und einer Unterseite 18 durch jeweils drei Rippen 19a, 19b, 19c bzw. 19d, 19e, 19f bestimmt wird. Der zweite Arbeitsabschnitt 7 ist zwischen dem ersten Arbeitsabschnitt 6 und dem Verbindungsabschnitt 4 um einen Verdrehwinkel β = 180° um die Längsachse 11 verdreht. Entsprechend zeigt ein weiterer Schnitt IIc-IIc, welcher parallel zu dem Schnitt IIb-IIb ausgeführt ist (siehe Figur 2c) einen Querschnitt D des Flachprofils 20 in einer gegenüber dem Querschnitt C um 90° verdrehten Stellung.In the FIG. 2a a non-inventive chisel 1 is shown in side view. An insertion end 3 of the bit is connected via a connecting portion 4 with a working end 5. The working end 5 is composed of a first working section 6 and a second working section 7. The bit 1 is designed as a flat chisel 14, wherein the first working portion 6 is formed by a wedge-shaped tip 15 in side view from an arrow direction y. The wedge-shaped tip 15 has a cutting edge 16. The bit 1 has a longitudinal axis 11 which extends through the cutting edge 16. In the FIG. 2b is a section through the second working portion 7 of the chisel 1 according to the in the FIG. 2a shown section line IIb-IIb shown. The second working section 7 is formed in the section running perpendicular to the longitudinal axis 11 as a cross-sectional area C of a flat profile 20 which is determined on an upper side 17 and a lower side 18 by three ribs 19a, 19b, 19c and 19d, 19e, 19f, respectively. The second working section 7 is rotated between the first working section 6 and the connecting section 4 by an angle of rotation β = 180 ° about the longitudinal axis 11. Correspondingly, a further section IIc-IIc, which is executed parallel to the section IIb-IIb (see Figure 2c ) has a cross-section D of the flat profile 20 in a relation to the cross-section C rotated by 90 ° position.

Die Figuren 3a bis 3c zeigen drei Ausführungsvarianten von erfindungsgemäßen Meißeln 1 mit unterschiedlichen Durchmessern D4. Ein Arbeitsabschnitt 7 ist entsprechend dem in der Figur 1a gezeigten Meißel als Spiralabschnitt ausgebildet, wobei dieser Spiralabschnitt aus Nuten 13a bis 13d bei den in den Figuren 3a bis 3c gezeigten Meißeln 1 sich zu einer Schneidspitze 10 hin verändernde Steigungen S73, S72 und S71 aufweist. Hierdurch steigt der Wert eines Steigungswinkels zu der Schneidspitze 10 hin von einem Wert α1 über einen Wert α2 auf einen Wert α3. Eine Änderung des Steigungswinkels erfolgt bei den in den Figuren 3a bis 3c gezeigten Meißeln 1 mit stetigen, nicht sprunghaften Übergängen.The FIGS. 3a to 3c show three embodiments of chisels 1 according to the invention with different diameters D4. A working section 7 is corresponding to that in the FIG. 1a shown chisel formed as a spiral section, said spiral section of grooves 13a to 13d in the in the FIGS. 3a to 3c shown chisels 1 to a cutting tip 10 towards changing slopes S73, S72 and S71. As a result, the value of a pitch angle to the cutting tip 10 increases from a value α1 over a value α2 to a value α3. A change in the pitch angle takes place in the in the FIGS. 3a to 3c shown chisels 1 with continuous, non-erratic transitions.

Die Erfindung ist nicht auf dargestellte oder beschriebene Ausführungsbeispiele beschränkt. Sie umfasst vielmehr Weiterbildungen der Erfindung im Rahmen der Schutzrechtsansprüche.The invention is not limited to illustrated or described embodiments. Rather, it includes developments of the invention within the scope of the patent claims.

Claims (6)

  1. Chisel (1), in particular for motor-driven machines (2), having a machine-side plug-in end (3) for receiving the chisel (1) in the machine (2), a working end (5) at the opposite end from the plug-in end (3), and a connecting portion (4) between the plug-in end (3) and the working end (5), wherein the working end (5) comprises a first working portion (6) and a second working portion (7), wherein the first working portion (6) narrows to a cutting tip (9), wherein the second working portion (7) is profiled between the first working portion (6) and the connecting portion (4) of the chisel (1), and wherein all cross-sectional areas (A, B; C, D), oriented perpendicularly to a longitudinal axis (11) of the chisel (1), of the second working portion (7) are congruent to one another, wherein the cross-sectional areas (A, B; C, D), following one another along the longitudinal axis (11) of the chisel (1) and perpendicular to the longitudinal axis (11), of the second working portion (7) are arranged in a twisted manner with respect to one another about the longitudinal axis (11) of the chisel (1), and the chisel (1) is in the form of a pointed chisel (8), wherein the first working portion (6) is formed by a conical or pyramidal tip (9) and in the second working portion (7), between the first working portion (6) and the connecting portion (4) of the pointed chisel (8), at least one groove (13a, 13b, 13c, 13d) extends helically about the longitudinal axis (11) of the pointed chisel (8), characterized in that the groove (13a, 13b, 13c, 13d) has a constant pitch angle (α) between α = 2° and α = 70°, wherein the groove (13a, 13b, 13c, 13d) runs out parallel to the longitudinal axis (11) from the second working portion (7) into the first working portion (6) and into the connecting portion (4).
  2. Chisel according to Claim 1, characterized in that the second working portion (7) is formed in a cylindrical manner.
  3. Chisel according to Claim 1, characterized in that the groove (13a, 13b, 13c, 13d) has a pitch angle (α) where α = 12°.
  4. Chisel according to one of the preceding Claims 1 to 3, characterized in that a diameter (D4) of the connecting portion (4) and a diameter (D7) of an envelope circle (HK7) about the second working portion (7) of the working end (5) are virtually identical.
  5. Chisel according to one of the preceding Claims 1 to 4, characterized in that, during working operation, the pointed chisel (8) is drivable into material to be processed with the first working portion (6) and approximately a front half of its second working portion (7).
  6. Chisel according to one of the preceding Claims 1 to 5, characterized in that a plurality of grooves (13a, 13b, 13c, 13d) run around the second working portion (7) of the working end (5) of the pointed chisel (8).
EP08786510.1A 2007-09-28 2008-07-28 Chisel, particularly for motor-driven machines Active EP2205403B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710046759 DE102007046759A1 (en) 2007-09-28 2007-09-28 Chisels especially for motor-driven machines
PCT/EP2008/059869 WO2009043617A1 (en) 2007-09-28 2008-07-28 Chisel, particularly for motor-driven machines

Publications (2)

Publication Number Publication Date
EP2205403A1 EP2205403A1 (en) 2010-07-14
EP2205403B1 true EP2205403B1 (en) 2018-11-21

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Application Number Title Priority Date Filing Date
EP08786510.1A Active EP2205403B1 (en) 2007-09-28 2008-07-28 Chisel, particularly for motor-driven machines

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Country Link
EP (1) EP2205403B1 (en)
DE (1) DE102007046759A1 (en)
WO (1) WO2009043617A1 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2960811B1 (en) * 2010-06-02 2013-03-29 Diager PIC GENDER TOOL
EP2502710B1 (en) 2011-03-22 2020-04-22 Black & Decker Inc. Chisels
USD737875S1 (en) 2013-03-15 2015-09-01 Black & Decker Inc. Drill bit
USD734792S1 (en) 2013-03-15 2015-07-21 Black & Decker Inc. Drill bit
DE102019200776A1 (en) * 2019-01-23 2020-07-23 Robert Bosch Gmbh Insert tool and method for manufacturing an insert tool
USD921465S1 (en) 2019-05-06 2021-06-08 Milwaukee Electric Tool Corporation Mortar knife
USD923447S1 (en) 2019-05-06 2021-06-29 Milwaukee Electric Tool Corporation Chisel
USD922842S1 (en) 2019-05-06 2021-06-22 Milwaukee Electric Tool Corporation Chisel
USD922841S1 (en) 2019-05-06 2021-06-22 Milwaukee Electric Tool Corporation Chisel
USD922840S1 (en) 2019-05-06 2021-06-22 Milwaukee Electric Tool Corporation Chisel

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DE463571C (en) * 1928-08-01 Ed Doerrenberg Soehne Ohg Multi-edged pointed iron for mining hammers
DE733686C (en) * 1940-04-04 1943-04-01 Ernst Doering Fa Hardened profile chisel
FR1154607A (en) * 1955-07-04 1958-04-14 Jack hammer needle
FR2098822A5 (en) * 1970-07-23 1972-03-10 Muller Sa
DE10244509A1 (en) 2002-09-25 2004-04-08 Hilti Ag Pointed chisel

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Also Published As

Publication number Publication date
DE102007046759A1 (en) 2009-04-02
WO2009043617A1 (en) 2009-04-09
EP2205403A1 (en) 2010-07-14

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