EP1413403A1 - Pointed chisel - Google Patents

Pointed chisel Download PDF

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Publication number
EP1413403A1
EP1413403A1 EP03103506A EP03103506A EP1413403A1 EP 1413403 A1 EP1413403 A1 EP 1413403A1 EP 03103506 A EP03103506 A EP 03103506A EP 03103506 A EP03103506 A EP 03103506A EP 1413403 A1 EP1413403 A1 EP 1413403A1
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EP
European Patent Office
Prior art keywords
area
shank
pointed chisel
axial grooves
diameter
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Withdrawn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
EP03103506A
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German (de)
French (fr)
Inventor
Jozsef Szendrovari
Werner Britten
Jozsef Varaga
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.)
Hilti AG
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Publication of EP1413403A1 publication Critical patent/EP1413403A1/en
Withdrawn legal-status Critical Current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
    • 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
    • B25D2250/211—Cross-sections of the tool
    • B25D2250/215—Narrowing cross-sections

Definitions

  • the invention relates to a pointed chisel driven by a machine tool, in particular for processing rock and concrete.
  • Such pointed chisels have an elongated shank with an insertion end on the machine side for receiving the axially limited movement in the striking machine tool and a working area which tapers to a point on the workpiece and ends in an abrasively effective tip.
  • the abrasive wear of this tip when used appropriately shortens the area of use tapering to the point of the workpiece, which increases the abrasive cross-section of the shaft and blunts the pointed chisel.
  • Shaft cross sections in the form of a concave polygon have a self-sharpening effect, which improves the mining performance.
  • the area of use forms a prismatic core diameter and the shaft cross-section forms a concave polygon with six axial grooves.
  • the concave polygon only extends radially beyond the prismatic core diameter, which means that the self-sharpening effect is only effective in the middle and late partial use area if the area of use has already become dull. In the early part-use area, however, only the prismatic core diameter without self-sharpening effect is effective.
  • the object of the invention is to realize a pointed chisel which has a particularly high removal rate in the early area of use.
  • a pointed chisel that can be driven by a machine tool has an elongated shaft with an insertion end on the machine side and a use area on the workpiece side, which has an enveloping circle diameter that tapers on the workpiece side and a shank cross section that is designed as a concave polygon with axial grooves up to a core diameter, the narrow diameter of the workpiece decreasing ,
  • the core diameter tapering in addition to the enveloping circle diameter on the workpiece side, a shank cross section formed as a concave polygon is always formed, as a result of which the self-sharpening effect is always substantially effective.
  • the tapered envelope diameter combined with a correspondingly tapered core diameter enables a particularly high removal rate to be achieved.
  • the enveloping circle diameter is advantageously tapered convexly on the workpiece side, as a result of which the removal power only decreases degressively with increasing service life.
  • the shaft cross-section is advantageously similar in terms of different, arbitrarily selectable positions of the shaft within the area of use, as a result of which the shape of the concave polygon is retained over the period of use and the self-sharpening effect always contributes to the same extent to the degradation performance.
  • the area of use advantageously has exactly 2 n- numbered axial grooves, where n is a natural number, as a result of which the axial grooves can be produced in a technologically simple manner by means of cross-section-preserving forming processes such as cold presses.
  • the area of use advantageously has exactly four, further advantageously offset between 75 ° and 105 °, axial grooves, as a result of which the pointed chisel is particularly suitable for enveloping circle diameters in the range from 12 mm to 40 mm.
  • the area of use has exactly eight axial grooves, further advantageously offset by 45 °, as a result of which the pointed chisel is particularly suitable for enveloping circle diameters in the range from 35 mm to 50 mm.
  • the shaft cross-sectional area is advantageously reduced from 40-60% of the area of use on the workpiece side to 80% to 70%, as a result of which the wave resistance increases on the workpiece side and thus the impact pulse voltage is increased.
  • the enveloping circle diameter of the area of use with the axial grooves is advantageously greater than the shaft diameter of the rest of the shaft, as a result of which the change in the cross-sectional area of the shaft in the transition region is only slight.
  • the cross-sectional areas of the shank advantageously remain the same in the transition region, as a result of which there is a low-reflection impact pulse transmission.
  • a pointed chisel which can be driven in a striking manner has an elongated shaft 1 with an insertion end 2 on the machine side and a use area 3 on the workpiece, which extends from an early partial use area A via the central partial use area B to the late partial use area C.
  • an enveloping circle diameter H that tapers convexly on the workpiece side
  • the core diameter K tapers on the workpiece side and the shaft cross-section 5 tapered to 75% on the workpiece side from 50% of the area of use 3 is self-similar with regard to different positions I, II, III, IV, V.
  • the enveloping circle diameter H of the use area 3 with the axial grooves 4 is larger than the shaft diameter S of the rest of the shaft 1, the shaft cross-sectional areas A ', A "remaining the same in the transition area.
  • the shaft cross-section 5 has exactly two axial grooves 4 offset by 180 °.
  • the shaft cross section 5 has exactly eight axial grooves 4, alternately offset by 35 ° and 55 °, which alternately form a groove web 6 with the enveloping circle diameter H and a radially smaller intermediate groove web 7 with the enveloping circle diameter h between circumferentially adjacent axial grooves 4.

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

Abstract

The diamond-point chisel has a long shaft (1) with an insertion end (2) on the machine side and a use region (3) on the workpiece side, with a shell diameter (H) decreasing on the workpiece side and a shaft cross section with axial grooves (4) as far as a core diameter (K) in the corm of a concave polygon. The core diameter decreases on the workpiece side.

Description

Die Erfindung bezeichnet einen von einer Werkzeugmaschine schlagend angetriebenen Spitzmeissel, insbesondere zur Bearbeitung von Gestein und Beton.The invention relates to a pointed chisel driven by a machine tool, in particular for processing rock and concrete.

Derartige Spitzmeissel weisen einen länglichen Schaft mit einem maschinenseitigen Einsteckende zur axial begrenzt beweglichen Aufnahme in die schlagende Werkzeugmaschine und einen werkstückseitig spitz zulaufenden Nutzungsbereich auf, welcher in einer abrasiv wirksamen Spitze endet. Durch den bei zweckentsprechender Benutzung abrasiven Verschleiss dieser Spitze verkürzt sich stetig der werkstückseitig spitz zulaufende Nutzungsbereich, wodurch sich der abrasiv wirksame Schaftquerschnitt vergrössert und der Spitzmeissel abstumpft. Schaftquerschnitte in der Form eines konkaven Polygons weisen einen Selbstschärfungseffekt auf, welcher die Abbauleistung verbessert.Such pointed chisels have an elongated shank with an insertion end on the machine side for receiving the axially limited movement in the striking machine tool and a working area which tapers to a point on the workpiece and ends in an abrasively effective tip. The abrasive wear of this tip when used appropriately shortens the area of use tapering to the point of the workpiece, which increases the abrasive cross-section of the shaft and blunts the pointed chisel. Shaft cross sections in the form of a concave polygon have a self-sharpening effect, which improves the mining performance.

Nach der EP0156789A1 ist ein von einer Werkzeugmaschine schlagend angetriebener Spitzmeissel mit einem länglichen Schaft, einem maschinenseitigen Einsteckende, einem sich werkstückseitig konvex verjüngenden Hüllkreisdurchmesser und einem als konkaves Polygon mit zwei bzw. vier Axialnuten ausgebildeten Schaftquerschnitt ausgebildet, wobei der Nutzungsbereich einen prismatischen Kerndurchmesser aufweist. Nach der DE19914522A1 bildet der Nutzungsbereich einen prismatischen Kerndurchmesser und der Schaftquerschnitt ein konkaves Polygon mit sechs Axialnuten aus. Das konkave Polygon erstreckt sich jeweils nur radial über den prismatischen Kerndurchmesser hinaus, wodurch der Selbstschärfungseffekt im Wesentlichen nur bei bereits abrasiv abgestumpftem Nutzungsbereich im mittleren und späten Teilnutzungsbereich wirksam wird. Im frühen Teilnutzungsbereich ist hingegen nur der prismatische Kerndurchmesser ohne Selbstschärfungseffekt wirksam.According to EP0156789A1, a pointed chisel driven by a machine tool with an elongated shaft, an insertion end on the machine side, an enveloping circle diameter which tapers convexly on the workpiece side and a shaft cross section designed as a concave polygon with two or four axial grooves, the usage area having a prismatic core diameter. According to DE19914522A1, the area of use forms a prismatic core diameter and the shaft cross-section forms a concave polygon with six axial grooves. The concave polygon only extends radially beyond the prismatic core diameter, which means that the self-sharpening effect is only effective in the middle and late partial use area if the area of use has already become dull. In the early part-use area, however, only the prismatic core diameter without self-sharpening effect is effective.

Die Aufgabe der Erfindung besteht in der Realisierung eines Spitzmeissels, welcher im frühen Nutzungsbereich eine besonders hohe Abbauleistung aufweist.The object of the invention is to realize a pointed chisel which has a particularly high removal rate in the early area of use.

Die Aufgabe wird im Wesentlichen durch die Merkmale der unabhängigen Ansprüche gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.The task is essentially solved by the features of the independent claims. Advantageous further developments result from the subclaims.

Im Wesentlichen weist ein von einer Werkzeugmaschine schlagend antreibbarer Spitzmeissel einen länglichen Schaft mit einem maschinenseitigen Einsteckende und einem werkstückseitigen Nutzungsbereich auf, welcher einen sich werkstückseitig verjüngenden Hüllkreisdurchmesser und einen mit Axialnuten bis zu einem Kerndurchmesser als konkaves Polygon ausgebildeten Schaftquerschnitt aufweist, wobei sich der Kerndurchmesser werkstückseitig verjüngt.Essentially, a pointed chisel that can be driven by a machine tool has an elongated shaft with an insertion end on the machine side and a use area on the workpiece side, which has an enveloping circle diameter that tapers on the workpiece side and a shank cross section that is designed as a concave polygon with axial grooves up to a core diameter, the narrow diameter of the workpiece decreasing ,

Durch den sich neben dem Hüllkreisdurchmesser werkstückseitig verjüngenden Kerndurchmesser bildet sich stets ein als konkaves Polygon ausgebildeter Schaftquerschnitt aus, wodurch der Selbstschärfungseffekt stets wesentlich wirksam ist. Insbesondere im frühen Teilnutzungsbereich ist durch den verjüngten Hüllkreisdurchmesser verbunden mit einem entsprechend verjüngten Kerndurchmesser eine besonders hohe Abbauleistung erzielbar.As a result of the core diameter tapering in addition to the enveloping circle diameter on the workpiece side, a shank cross section formed as a concave polygon is always formed, as a result of which the self-sharpening effect is always substantially effective. Particularly in the early partial use area, the tapered envelope diameter combined with a correspondingly tapered core diameter enables a particularly high removal rate to be achieved.

Vorteilhaft ist im Nutzungsbereich der Hüllkreisdurchmesser werkstückseitig konvex verjüngt, wodurch die Abbauleistung mit steigender Nutzungsdauer nur degressiv abnimmt.In the area of use, the enveloping circle diameter is advantageously tapered convexly on the workpiece side, as a result of which the removal power only decreases degressively with increasing service life.

Vorteilhaft ist der Schaftquerschnitt bezüglich verschiedener, beliebig wählbarer Positionen des Schafts innerhalb des Nutzungsbereiches selbstähnlich, wodurch die Form des konkaven Polygons über die Nutzungsdauer erhalten bleibt und der Selbstschärfungseffekt stets zu gleichen Anteilen zur Abbauleistung beiträgt.The shaft cross-section is advantageously similar in terms of different, arbitrarily selectable positions of the shaft within the area of use, as a result of which the shape of the concave polygon is retained over the period of use and the self-sharpening effect always contributes to the same extent to the degradation performance.

Vorteilhaft weist der Nutzungsbereich genau 2n-zahlige Axialnuten auf, wobei n eine natürliche Zahl ist, wodurch die Axialnuten technologisch einfach über querschnittserhaltende Umformverfahren wie Kaltpressen herstellbar sind.The area of use advantageously has exactly 2 n- numbered axial grooves, where n is a natural number, as a result of which the axial grooves can be produced in a technologically simple manner by means of cross-section-preserving forming processes such as cold presses.

Vorteilhaft weist der Nutzungsbereich genau vier, weiter vorteilhaft zwischen 75° und 105° versetzte, Axialnuten auf, wodurch sich der Spitzmeissel besonders für Hüllkreisdurchmesser im Bereich von 12 mm bis 40 mm eignet.The area of use advantageously has exactly four, further advantageously offset between 75 ° and 105 °, axial grooves, as a result of which the pointed chisel is particularly suitable for enveloping circle diameters in the range from 12 mm to 40 mm.

Alternativ vorteilhaft weist der Nutzungsbereich genau acht, weiter vorteilhaft um 45° versetzte, Axialnuten auf, wodurch sich der Spitzmeissel besonders für Hüllkreisdurchmesser im Bereich von 35 mm bis 50 mm eignet.As an alternative, the area of use has exactly eight axial grooves, further advantageously offset by 45 °, as a result of which the pointed chisel is particularly suitable for enveloping circle diameters in the range from 35 mm to 50 mm.

Vorteilhaft verringert sich die Schaftquerschnittsfläche ab 40-60% des Nutzungsbereiches werkstückseitig auf 80% bis 70%, wodurch werkstückseitig der Wellenwiderstand steigt und somit die Schlagimpulsspannung verstärkt wird.The shaft cross-sectional area is advantageously reduced from 40-60% of the area of use on the workpiece side to 80% to 70%, as a result of which the wave resistance increases on the workpiece side and thus the impact pulse voltage is increased.

Vorteilhaft ist der Hüllkreisdurchmesser des Nutzungsbereiches mit den Axialnuten grösser als der Schaftdurchmesser des restlichen Schafts, wodurch die Änderung der Schaftquerschnittsfläche im Übergangsbereich nur gering ist.The enveloping circle diameter of the area of use with the axial grooves is advantageously greater than the shaft diameter of the rest of the shaft, as a result of which the change in the cross-sectional area of the shaft in the transition region is only slight.

Vorteilhaft bleiben im Übergangsbereich die Schaftquerschnittsflächen gleich, wodurch eine reflektionsarme Schlagimpulsübertragung gegeben ist.The cross-sectional areas of the shank advantageously remain the same in the transition region, as a result of which there is a low-reflection impact pulse transmission.

Die Erfindung wird bezüglich eines vorteilhaften Ausführungsbeispiels näher erläutert mit:

Fig. 1
als Spitzmeissel
Fig. 1a - 1f
als Querschnitte gemäss den Positionen I, II, III, IV, V und VI in Fig. 1
Fig. 2
als Variante des Schaftquerschnitts
Fig. 3
als Variante des Schaftquerschnitts
The invention is explained in more detail with respect to an advantageous exemplary embodiment with:
Fig. 1
as a pointed chisel
1a-1f
as cross sections according to positions I, II, III, IV, V and VI in FIG. 1
Fig. 2
as a variant of the shaft cross-section
Fig. 3
as a variant of the shaft cross-section

Nach Fig. 1 weist ein schlagend antreibbarer Spitzmeissel einen länglichen Schaft 1 mit einem maschinenseitigen Einsteckende 2 und einem werkstückseitigen Nutzungsbereich 3 auf, der sich von einem frühen Teilnutzungsbereich A über den mittleren Teilnutzungsbereich B zum späten Teilnutzungsbereich C erstreckt. Bei einem sich werkstückseitig konvex verjüngenden Hüllkreisdurchmesser H sind genau vier, zu 90° versetzte Axialnuten 4 vorhanden, die mit steilen Nutflanken radial bis zu einem Kerndurchmesser K hineinragen und einen Schaftquerschnitt 5 in Form eines konkaven Polygons bilden. Der Kerndurchmesser K verjüngt sich werkstückseitig und der ab 50% des Nutzungsbereiches 3 werkstückseitig auf 75% verjüngte Schaftquerschnitt 5 ist bezüglich verschiedener Positionen I, II, III, IV, V selbstähnlich. Der Hüllkreisdurchmesser H des Nutzungsbereiches 3 mit den Axialnuten 4 ist grösser als der Schaftdurchmesser S des restlichen Schafts 1, wobei die Schaftquerschnittsflächen A', A" im Übergangsbereich gleich bleiben.According to FIG. 1, a pointed chisel which can be driven in a striking manner has an elongated shaft 1 with an insertion end 2 on the machine side and a use area 3 on the workpiece, which extends from an early partial use area A via the central partial use area B to the late partial use area C. In the case of an enveloping circle diameter H that tapers convexly on the workpiece side, there are exactly four axial grooves 4 offset at 90 °, which protrude radially up to a core diameter K with steep groove flanks and form a shank cross section 5 in the form of a concave polygon. The core diameter K tapers on the workpiece side and the shaft cross-section 5 tapered to 75% on the workpiece side from 50% of the area of use 3 is self-similar with regard to different positions I, II, III, IV, V. The enveloping circle diameter H of the use area 3 with the axial grooves 4 is larger than the shaft diameter S of the rest of the shaft 1, the shaft cross-sectional areas A ', A "remaining the same in the transition area.

Nach Fig. 2 weist der Schaftquerschnitt 5 genau zwei, zu 180° versetzte Axialnuten 4 auf.2, the shaft cross-section 5 has exactly two axial grooves 4 offset by 180 °.

Nach Fig. 3 weist der Schaftquerschnitt 5 genau acht, alternierend zu 35° und 55° versetzte Axialnuten 4 auf, welche zwischen umlaufend benachbarten Axialnuten 4 alternierend einen Nutensteg 6 mit dem Hüllkreisdurchmesser H und einen radial kleineren Zwischennutensteg 7 mit dem Hüllkreisdurchmesser h ausbilden.According to FIG. 3, the shaft cross section 5 has exactly eight axial grooves 4, alternately offset by 35 ° and 55 °, which alternately form a groove web 6 with the enveloping circle diameter H and a radially smaller intermediate groove web 7 with the enveloping circle diameter h between circumferentially adjacent axial grooves 4.

Claims (9)

Spitzmeissel mit einem länglichen Schaft (1) mit einem maschinenseitigen Einsteckende (2) zur Aufnahme in einer Werkzeugmaschine und einem werkstückseitigen Nutzungsbereich (3), welcher einen sich werkstückseitig verjüngenden Hüllkreisdurchmesser (H) und einen mit Axialnuten (4) bis zu einem Kerndurchmesser (K) als konkaves Polygon ausgebildeten Schaftquerschnitt (5) aufweist, dadurch gekennzeichnet, dass sich der Kerndurchmesser (K) werkstückseitig verjüngt.Pointed chisel with an elongated shank (1) with a machine-side insertion end (2) for receiving in a machine tool and a work area (3) on the workpiece side, which has a tapering envelope diameter (H) and one with axial grooves (4) up to a core diameter (K ) has a shank cross section (5) designed as a concave polygon, characterized in that the core diameter (K) tapers on the workpiece side. Spitzmeissel nach Anspruch 1, dadurch gekennzeichnet, dass im Nutzungsbereich (3) der Hüllkreisdurchmesser (H) werkstückseitig konvex verjüngt ist.Pointed chisel according to claim 1, characterized in that in the area of use (3) the enveloping circle diameter (H) is tapered convexly on the workpiece side. Spitzmeissel nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Schaftquerschnitt (5) bezüglich verschiedener Positionen (I, II, III, IV, V) selbstähnlich ist.Pointed chisel according to claim 1 or 2, characterized in that the shank cross section (5) is self-similar with respect to different positions (I, II, III, IV, V). Spitzmeissel nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Nutzungsbereich (3) genau 2n Axialnuten (4) aufweist.Pointed chisel according to one of claims 1 to 3, characterized in that the area of use (3) has exactly 2 n axial grooves (4). Spitzmeissel nach Anspruch 4, dadurch gekennzeichnet, dass der Nutzungsbereich (3) genau vier Axialnuten (4) aufweist, welche optional zwischen 75° und 105° versetzt sind.Pointed chisel according to claim 4, characterized in that the area of use (3) has exactly four axial grooves (4), which are optionally offset between 75 ° and 105 °. Spitzmeissel nach Anspruch 4, dadurch gekennzeichnet, dass der Nutzungsbereich (3) genau acht Axialnuten (4) aufweist, welche optional um 30 bis 55° versetzt sind.Pointed chisel according to claim 4, characterized in that the area of use (3) has exactly eight axial grooves (4), which are optionally offset by 30 to 55 °. Spitzmeissel nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass sich die Schaftquerschnittsfläche (A', A") vom maschinenseitigen Stirnende ausgehend über 40-60% des Nutzungsbereiches (3) werkstückseitig auf 80% bis 70% verringert.Pointed chisel according to one of claims 1 to 6, characterized in that the cross-sectional area of the shank (A ', A ") is reduced from the machine end to 40-60% of the area of use (3) on the workpiece to 80% to 70%. Spitzmeissel nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass der Hüllkreisdurchmesser (H) des Nutzungsbereiches (3) mit den Axialnuten (4) grösser als der Schaftdurchmesser (S) des restlichen Schafts (1) ist.Pointed chisel according to one of the preceding claims, characterized in that the enveloping circle diameter (H) of the area of use (3) with the axial grooves (4) is larger than the shank diameter (S) of the rest of the shank (1). Spitzmeissel nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Schaftquerschnittsfläche (A', A") im Übergang vom Nutzungsbereich (3) zum restlichen Schaft (1) gleich bleibt.Pointed chisel according to one of the preceding claims, characterized in that the shank cross-sectional area (A ', A ") remains the same in the transition from the area of use (3) to the rest of the shank (1).
EP03103506A 2002-09-25 2003-09-23 Pointed chisel Withdrawn EP1413403A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10244509 2002-09-25
DE10244509A DE10244509A1 (en) 2002-09-25 2002-09-25 Pointed chisel

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EP1413403A1 true EP1413403A1 (en) 2004-04-28

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US (1) US6981496B2 (en)
EP (1) EP1413403A1 (en)
JP (1) JP4482303B2 (en)
CN (1) CN100341673C (en)
AU (1) AU2003244606C1 (en)
DE (1) DE10244509A1 (en)
HU (1) HU224801B1 (en)
ZA (1) ZA200307420B (en)

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DE202013003876U1 (en) 2013-03-04 2013-06-25 BBG Baugeräte GmbH breaking tool
USD734792S1 (en) 2013-03-15 2015-07-21 Black & Decker Inc. Drill bit
US9085074B2 (en) 2011-03-22 2015-07-21 Black & Decker Inc. Chisels
USD737875S1 (en) 2013-03-15 2015-09-01 Black & Decker Inc. Drill bit

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US8449041B2 (en) * 2010-10-27 2013-05-28 Sandvik Intellectual Property Ab Grading pick with extended fins
DE102012202300A1 (en) * 2012-02-15 2013-08-22 Hilti Aktiengesellschaft chisel
JP5203524B1 (en) * 2012-06-12 2013-06-05 関門港湾建設株式会社 Cross-shaped rock crusher
US9333564B2 (en) 2013-03-15 2016-05-10 Black & Decker Inc. Drill bit
USD756741S1 (en) * 2014-04-10 2016-05-24 Robert Bosch Gmbh Chisel
CN105178866A (en) * 2015-10-10 2015-12-23 广西恒日科技股份有限公司 Cone rock bit
EP3222390A1 (en) 2016-03-23 2017-09-27 HILTI Aktiengesellschaft Chisel
US10876401B1 (en) * 2016-07-26 2020-12-29 The Sollami Company Rotational style tool bit assembly
US10507568B2 (en) * 2016-12-15 2019-12-17 Caterpillar Inc. Hammer work tool having multi-position retention collar
CN108798694A (en) * 2018-07-18 2018-11-13 韩睿 A kind of drill steel and hydraulic crushing hammer mechanism and its driving method
DE102018133250A1 (en) 2018-12-20 2020-06-25 Drebo Werkzeugfabrik Gmbh Pointed chisel
USD923447S1 (en) 2019-05-06 2021-06-29 Milwaukee Electric Tool Corporation Chisel
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USD922842S1 (en) * 2019-05-06 2021-06-22 Milwaukee Electric Tool Corporation Chisel
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AU2003244606A1 (en) 2004-04-22
HU224801B1 (en) 2006-02-28
JP2004114294A (en) 2004-04-15
US6981496B2 (en) 2006-01-03
CN100341673C (en) 2007-10-10
ZA200307420B (en) 2004-07-01
HUP0303119A2 (en) 2004-11-29
HU0303119D0 (en) 2003-11-28
AU2003244606C1 (en) 2008-10-23
DE10244509A1 (en) 2004-04-08
AU2003244606B2 (en) 2008-01-17
US20040069292A1 (en) 2004-04-15
CN1496791A (en) 2004-05-19
JP4482303B2 (en) 2010-06-16

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