EP3496902B1 - Chisel - Google Patents
Chisel Download PDFInfo
- Publication number
- EP3496902B1 EP3496902B1 EP17754628.0A EP17754628A EP3496902B1 EP 3496902 B1 EP3496902 B1 EP 3496902B1 EP 17754628 A EP17754628 A EP 17754628A EP 3496902 B1 EP3496902 B1 EP 3496902B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- longitudinal axis
- wings
- chisel
- tip
- section
- 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.)
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Links
- 210000001015 abdomen Anatomy 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 239000004566 building material Substances 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 238000005065 mining Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
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
- B25D2222/00—Materials of the tool or the workpiece
- B25D2222/72—Stone, rock or concrete
-
- 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
Definitions
- the present invention relates to a chisel for mining rock or mineral building materials such as concrete and brick, according to the preamble and how FR 905.582 known.
- An exemplary chisel for processing mineral building materials is from US 2012/0301238 known.
- the chisel has a shank and a working area that tapers into a point.
- the work area has four longitudinal ribs, which spread the chisel evenly when it penetrates the building material.
- the chisel according to the invention according to claim 1 has a shaft, a striking surface, a tip, a longitudinal axis running through the striking surface and the tip and a working section.
- the working section has a fuselage arranged on the longitudinal axis and two wings running along the fuselage and projecting radially with respect to the fuselage.
- the two wings are arranged in a V-shape.
- the chisel spreads the rock with the fuselage and the wings.
- the V-shaped arrangement of the wings reduces jamming in the subsurface compared to a rotationally symmetrical pointed chisel. Due to its non-rotationally symmetrical shape, the chisel generates not only radial forces for blowing up the rock but also non-radial forces acting along a vertical axis through the blades.
- a dihedral angle between the wings is less than 180 degrees.
- the dihedral angle indicates the relative inclination of the V-shaped wings to each other.
- the dihedral angle is measured between the lines connecting the tips of the wings with the longitudinal axis in planes perpendicular to the longitudinal axis.
- the wings have a cross section that varies along the longitudinal axis in one area, with each of the cross sections in this area only partially overlapping with the other cross sections. If you compare any first cross section with any second cross section, the first has Cross-section has areas protruding beyond the second cross-section and likewise the second cross-section has areas protruding beyond the first cross-section.
- the invention provides that the dihedral angle increases from the shaft to the tip.
- the wings are positioned closer to each other near the shaft than in the area of the tip.
- the wings can lie at the top in a plane with the longitudinal axis, i.e. have a dihedral angle of 180 degrees.
- the working section has no two-fold rotational symmetry about the longitudinal axis.
- the wings can be arranged mirror-symmetrically to a plane of symmetry containing the longitudinal axis.
- One embodiment provides that the two wings are mainly arranged above a horizontal plane containing the longitudinal axis.
- the center of gravity or the wing tip is continuously on one side of the horizontal plane H.
- the blades are inclined along the longitudinal axis by an angle of attack with respect to the longitudinal axis.
- the two wings rest only on the perforated wall with their upper side pointing in the same direction, the lower side does not lie or only partially.
- the uneven support reduces the risk of chiseling.
- the chisel experiences a net force offset to the longitudinal axis and parallel to a vertical axis.
- One embodiment provides that a radial dimension of the two wings decreases from the shaft to the tip.
- the fuselage is essentially rotationally shaped.
- the fuselage is arranged coaxially with the longitudinal axis.
- Fig. 1 shows an exemplary pointed chisel 1.
- the user can insert the pointed chisel 1 with a shank 2 in an electric chisel.
- a tip 3 of the pointed chisel 1 is pressed against the underground.
- the striking mechanism of the electric chisel exerts strikes in a striking direction 4 on a striking surface 5 on the shaft 2 .
- the shock wave of the impact passes through the shaft 2 and a working section 6 of the pointed chisel 1 and drives the tip 3 into the ground.
- the pointed chisel 1 has an elongated body.
- the narrow ends of the pointed chisel 1 are the striking surface 5 and the tip 3.
- a longitudinal axis 7 of the pointed chisel 1 runs through the striking surface 5 and the tip 3.
- the elongated body is divided into two sections along the longitudinal axis 7 : the shaft 2 and the working section 6.
- the shaft 2 begins at the face 5; the working portion 6 ends at the head 3.
- the shaft 2 may be adjacent or directly on the working section 6 may be connected by a short transition area 8 with the working portion. 6
- the shank 2 and the working section 6 differ in their function and an associated geometric shape.
- the shank 2 serves primarily to hold the pointed chisel 1 in a hand machine tool.
- the geometric shape is kept very simple and essentially uniform along the longitudinal axis, for example cylindrical or prismatic with a square or hexagonal cross section.
- the striking surface 5 forms the exposed end surface of the shaft 2 facing away from the tip 3.
- the striking surface 5 can be dome-shaped.
- the exemplary shaft 2 has a groove 9, which is closed along the longitudinal axis 7 .
- the shaft 2 can be inserted into a tool holder of the electric chisel.
- a locking body such as a pawl or a ball, engage in the groove 9 and secure the pointed chisel 1 in the tool holder.
- the exemplary shaft 2 has an annular collar 10 which projects radially over the shaft 2 .
- Other tool holders lock the pointed chisel 1 by means of a pivotable bracket which engages behind the collar 10 on the side of the tip 3 .
- the shaft 2 can have both the groove 9 and the collar 10 or only one of the two locking means.
- the working section 6 penetrates into the mining of mineral materials or rock.
- the working section 6 is designed for an efficient breaking up of a subsurface and with regard to a reduced tendency to jam in the subsurface.
- the geometric shape of the working section 6 is correspondingly significantly different from the basic shape of the shaft 2.
- the working section 6 in particular has no rotational symmetry about the longitudinal axis 7 .
- the working section 6 has a fuselage 11 and exactly two wings 12 projecting radially from the fuselage 11.
- the fuselage 11 lies on the longitudinal axis 7.
- the wings 12 are arranged in a V-shape.
- the two wings 12 preferably have an identical shape and are preferably arranged mirror-symmetrically to one another.
- a coordinate system is introduced for the description of section 6 .
- the coordinate system is based on a cuboid circumscribing the working section 6 with a longitudinal axis 7, a transverse axis 13 and a vertical axis 14.
- the three axes are orthogonal to one another and intersect at one point.
- the longitudinal axis 7 is defined by the connecting line from the tip 3 to the center of the face 5 . Axially and radially refer to the longitudinal axis 7.
- the transverse axis 13 and the vertical axis 14 correspond to the directions starting from the longitudinal axis 7, below which the dimension of the working section 6 parallel to the transverse axis 13 (width 15 ) is maximum and the dimension of the working section 6 parallel to the vertical axis 14 (height 16 ) is minimal.
- the transverse axis 13 is parallel to a connecting line of the opposite wing tips 17.
- the length 25 of the working section 6 is preferably significantly greater than the width 15 of the working section 6, for example at least five times as large.
- the width 15 of the working section 6 is preferably greater than the height 16, for example one and a half times as large.
- the plane spanned by the longitudinal axis 7 and the transverse axis 13 is referred to below as the horizontal plane H and the plane spanned by the longitudinal axis 7 and the transverse axis 13 is referred to as the vertical plane V.
- the working section 6 is asymmetrical with respect to the horizontal plane H.
- the working section 6 is preferably mirror-symmetrical with respect to the vertical plane V.
- the exemplary working section 6 has a guide area 18 with a width 15 constant along the longitudinal axis 7 ( 6 to 10 ) and a tip region 19 with a width 15 that decreases along the longitudinal axis 7 toward the tip 3 ( 4 to 6 ).
- the fuselage 11 is an essentially rod-shaped body with a circular cross section that tapers in the area of the tip 3 .
- the tip of the fuselage 11 forms the tip 3 of the pointed chisel 1.
- the cross section of the fuselage 11 can also be elliptical with an aspect ratio of at most 1: 1.2.
- the body 11 defines the longitudinal axis 7 of the chisel 1.
- the body 11 and the longitudinal axis 7 are coaxial.
- the exemplary wings 12 are essentially plate-shaped bodies, each with an upper side 20, a lower side 21 and a wing tip 17.
- the wing tip 17 denotes the outer radial edge of the wings 12.
- a thickness 22, ie the local distance between the top 20 and the bottom 21, the wing 12 is significantly less than the height 16 of the fuselage 11 or the working section 6.
- the thickness 22 can be largely constant in the radial direction.
- the top 20 and the bottom 21 can be described as approximately parallel.
- the top 20 and the bottom 21 may be flat or have approximately the same curvature along the radial direction.
- the wings 12 directly adjoin the fuselage 11 .
- the wings 12 divide the exposed surface of the fuselage 11 into a back 23 and a belly 24.
- the back 23 lies above a horizontal plane H
- the belly 24 lies below the horizontal plane H.
- the horizontal plane H is perpendicular to the vertical axis 14 and is from the Longitudinal axis 7 and the transverse axis 13 spanned.
- the wings 12 are preferably extended over the entire length 25 or a large part of the working section 6 .
- the axial dimension of the vanes 12 is significantly larger than their radial dimension, for example the axial dimension is at least five times larger than the radial dimension.
- the radial dimension 26 of the wings 12 and the radius of the fuselage 11 are approximately the same, for example have a relative difference of less than 25%.
- the radial dimension 26 of the wings 12 preferably decreases from the tip 3 to the shaft 2 in the same way as the radius of the conical fuselage 11 .
- a ratio of the dimensions can be constant.
- a focal point of the wings 12 lies above the horizontal plane H.
- the wings 12 are mainly arranged above the horizontal plane H , that is to say a portion of the wing 12 Above the horizontal plane H is greater than the proportion of the wing 12 below the horizontal plane H.
- a line through the centroids of the wings 12 in the successive cross sections can be in sections, in particular near the tip 3, on the horizontal plane H and is otherwise above the horizontal plane H. . the wing tips 17, however, do not belong to the shaft 2 to the tip 3 and above the horizontal plane H below the horizontal plane H.
- the two wings 12 are arranged in a V-shape, in particular in the guide area 18.
- a dihedral angle 27 between the two wings 12 is less than 180 degrees.
- the dihedral angle 27 is between 120 degrees and 170 degrees.
- the dihedral angle 27 is determined in the circumferential direction around the longitudinal axis 7 . Due to the V-shaped wings 12, the working section 6 has no rotational symmetry.
- the working section 6 has no two-fold rotational symmetry about the longitudinal axis 7, which would bring the rotation of the working section 6 through 180 degrees to coincide with itself.
- the working section 6 also has no mirror symmetry with respect to the horizontal plane H due to the V-shaped wings 12 .
- the relative V-shaped adjustment of the two wings 12 to one another increases in the direction from the tip 3 to the shaft 2 .
- the dihedral angle 27 is preferably constant in the tip region 19 .
- the dihedral angle 27 remains constant while the width 15 changes.
- the wings 12 can lie in one plane, for example the horizontal plane H.
- the dihedral angle 27 is, for example, between 170 degrees and 180 degrees, preferably 180 degrees.
- the dihedral angle 27 decreases continuously in the guide region 18 . Adjacent to the shaft 2 , the dihedral angle 27 is minimal and lies in a range between 120 degrees and 150 degrees.
- the width 15 of the working section 6 is preferably constant when the dihedral angle 27 changes.
- the wings 12 are tilted relative to the longitudinal axis 7 by an angle 29 .
- the angle of attack 29 can be seen in the side view.
- the wing tips 17 lie in a plane inclined to the longitudinal axis 7 by the angle of incidence 29 .
- a vertical distance 30, ie along the vertical axis 14, of the wing tips 17 to the horizontal plane H increases continuously from that of the tip 3 to the shaft 2 , in particular within the guide region.
- the working section 6 lies in the underground with the upper sides 20 of the wings 12 and the belly 24 of the fuselage 11 on the perforated wall.
- the undersides 21 of the wings 12 are from the hole wall spaced. Insofar as the undersides 21 abut the perforated wall, they exert less force on the perforated wall than the upper sides 20 .
- the back 23 can be provided with a depression 31 in an area adjacent to the shaft 2 .
- the trough 31 is preferably symmetrical to the vertical plane V.
- the trough 31 forms a concave surface on the back 23 .
- the radial distance between the surface of the trough 31 and the longitudinal axis 7 is in the range 18 between 66% and 85% of the radius of the fuselage 11.
- the belly 24 can be provided with a depression 32 in an area adjacent to the shaft 2 .
- the trough 32 is preferably symmetrical to the vertical plane V.
- the trough 32 forms a concave surface on the belly 24 .
- the radial distance between the surface of the trough 32 and the longitudinal axis 7 is in the range 18 between 66% and 85% of the radius of the fuselage 11.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
- Earth Drilling (AREA)
Description
Die vorliegende Erfindung betrifft einen MeiÃel zum Abbau von Gestein oder mineralischen Baustoffen wie Beton und Ziegel, gemÀà dem Oberbegriff und wie aus
Der erfindungsgemÀÃe MeiÃel gemÀà Anspruch 1 hat einen Schaft, eine SchlagflÀche, eine Spitze, eine durch die SchlagflÀche und die Spitze verlaufenden LÀngsachse und einen Arbeitsabschnitt. Der Arbeitsabschnitt hat einen auf der LÀngsachse angeordneten Rumpf und zwei lÀngs dem Rumpf verlaufende und radial gegenÃŒber dem Rumpf vorstehende FlÃŒgel. Die zwei FlÃŒgel sind V-förmig angeordnet. Der MeiÃel spreizt mit dem Rumpf und den FlÃŒgeln das Gestein auf. Die V-förmige Anordnung der FlÃŒgel verringert ein Verklemmen in dem Untergrund im Vergleich zu einem drehsymmetrisch aufgebauten SpitzmeiÃel. Der MeiÃel erzeugt aufgrund seiner nicht-drehsymmetrischen Form neben radial wirkenden KrÀften zum Sprengen des Gesteins auch nicht-radiale, lÀngs einer Hochachse wirkende KrÀfte durch die FlÃŒgel.The chisel according to the invention according to
Ein Diederwinkel zwischen den FlÌgeln ist geringer als 180 Grad. Der Diederwinkel gibt die relative Neigung der V-förmig angeordneten FlÌgel zueinander an. Der Diederwinkel wird zwischen den Verbindungslinien der Spitzen der FlÌgel mit der LÀngsachse in Ebenen senkrecht zu der LÀngsachse gemessen.A dihedral angle between the wings is less than 180 degrees. The dihedral angle indicates the relative inclination of the V-shaped wings to each other. The dihedral angle is measured between the lines connecting the tips of the wings with the longitudinal axis in planes perpendicular to the longitudinal axis.
Eine Ausgestaltung sieht vor, dass in einem Bereich die FlÌgel einen entlang der LÀngsachse variierenden Querschnitt aufweisen, wobei jeder der Querschnitte in diesem Bereich nur teilweise mit den anderen Querschnitten Ìberlappt. Vergleicht man einen beliebigen ersten Querschnitt mit einem beliebigen zweiten Querschnitt, so hat der erste Querschnitt Ìber den zweiten Querschnitt hinausragende FlÀchen und ebenso hat der zweite Querschnitt Ìber den ersten Querschnitt hinausragende FlÀchen.One embodiment provides that the wings have a cross section that varies along the longitudinal axis in one area, with each of the cross sections in this area only partially overlapping with the other cross sections. If you compare any first cross section with any second cross section, the first has Cross-section has areas protruding beyond the second cross-section and likewise the second cross-section has areas protruding beyond the first cross-section.
Die Erfindung sieht vor, dass der Diederwinkel von dem Schaft zu der Spitze zunimmt. Die FlÌgel sind nahe dem Schaft stÀrker zueinander angestellt als im Bereich der Spitze. Die FlÌgel können an der Spitze in einer Ebene mit der LÀngsachse liegen, d.h. einen Diederwinkel von 180 Grad aufweisen.The invention provides that the dihedral angle increases from the shaft to the tip. The wings are positioned closer to each other near the shaft than in the area of the tip. The wings can lie at the top in a plane with the longitudinal axis, i.e. have a dihedral angle of 180 degrees.
Eine Ausgestaltung sieht vor, dass der Arbeitsabschnitt keine zweizÀhlige Drehsymmetrie um die LÀngsachse aufweist. Die FlÌgel können spiegelsymmetrisch zu einer die LÀngsachse enthaltenden Symmetrieebene angeordnet sind.One embodiment provides that the working section has no two-fold rotational symmetry about the longitudinal axis. The wings can be arranged mirror-symmetrically to a plane of symmetry containing the longitudinal axis.
Eine Ausgestaltung sieht vor, dass die zwei FlÌgel hauptsÀchlich oberhalb einer die LÀngsachse enthaltenden Horizontalebene angeordnet sind. Der Schwerpunkt oder die FlÌgelspitze liegt durchgehend auf einer Seite der Horizontalebene H.One embodiment provides that the two wings are mainly arranged above a horizontal plane containing the longitudinal axis. The center of gravity or the wing tip is continuously on one side of the horizontal plane H.
Eine Ausgestaltung sieht vor, dass die FlÃŒgel lÀngs der LÀngsachse um einen Anstellwinkel gegenÃŒber der LÀngsachse geneigt sind. Die beiden FlÃŒgel liegen nur mit ihrer in die gleiche Richtung weisenden Oberseite an der Lochwand an, die Unterseite liegt nicht oder nur teilweise an. Die ungleiche AbstÃŒtzung verringert das Risiko des FestmeiÃelns. Die MeiÃel erfÀhrt eine Nettokraft versetzt zu der LÀngsachse und parallel zu einer Hochachse.One embodiment provides that the blades are inclined along the longitudinal axis by an angle of attack with respect to the longitudinal axis. The two wings rest only on the perforated wall with their upper side pointing in the same direction, the lower side does not lie or only partially. The uneven support reduces the risk of chiseling. The chisel experiences a net force offset to the longitudinal axis and parallel to a vertical axis.
Eine Ausgestaltung sieht vor, dass eine radiale Abmessung der zwei FlÃŒgel von dem Schaft zu der Spitze abnimmt.One embodiment provides that a radial dimension of the two wings decreases from the shaft to the tip.
Eine Ausgestaltung sieht vor, dass der Rumpf im Wesentlichen rotationsförmig ausgebildet ist. Eine Ausgestaltung sieht vor, dass der Rumpfs koaxial zu der LÀngsachse angeordnet ist.One embodiment provides that the fuselage is essentially rotationally shaped. One embodiment provides that the fuselage is arranged coaxially with the longitudinal axis.
Die nachfolgende Beschreibung erlÀutert die Erfindung anhand von exemplarischen AusfÌhrungsformen und Figuren. In den Figuren zeigen:
- Fig. 1
- einen MeiÃel
- Fig. 2
- einen Querschnitt durch den MeiÃel
- Fig. 3
- eine Seitenansicht des MeiÃels
- Fig. 4
- einen Querschnitt in der Ebene IV-IV
- Fig. 5
- einen Querschnitt in der Ebene V-V
- Fig. 6
- einen Querschnitt in der Ebene VI-VI
- Fig. 7
- einen Querschnitt in der Ebene VII-VII
- Fig. 8
- einen Querschnitt in der Ebene VIII-VIII
- Fig. 9
- einen Querschnitt in der Ebene IX-IX
- Fig. 10
- einen Querschnitt in der Ebene X-X
- Fig. 11
- einen Querschnitt in der Ebene XI-XI
- Fig. 1
- a chisel
- Fig. 2
- a cross section through the chisel
- Fig. 3
- a side view of the chisel
- Fig. 4
- a cross section in the plane IV-IV
- Fig. 5
- a cross section in the plane VV
- Fig. 6
- a cross section in the plane VI-VI
- Fig. 7
- a cross section in the plane VII-VII
- Fig. 8
- a cross section in the plane VIII-VIII
- Fig. 9
- a cross section in the plane IX-IX
- Fig. 10
- a cross section in the plane XX
- Fig. 11
- a cross section in the plane XI-XI
Gleiche oder funktionsgleiche Elemente werden durch gleiche Bezugszeichen in den Figuren indiziert, soweit nicht anders angegeben.Identical or functionally identical elements are indicated by the same reference symbols in the figures, unless stated otherwise.
Der SpitzmeiÃel 1 hat einen lÀnglichen Korpus. Die schmalen Enden des SpitzmeiÃels 1 sind die SchlagflÀche 5 und die Spitze 3. Eine LÀngsachse 7 des SpitzmeiÃels 1 verlÀuft durch die SchlagflÀche 5 und die Spitze 3. Der lÀngliche Korpus ist entlang der LÀngsachse 7 in zwei Abschnitte unterteilt: den Schaft 2 und den Arbeitsabschnitt 6. Der Schaft 2 beginnt an der SchlagflÀche 5; der Arbeitsabschnitt 6 endet an der Spitze 3. Der Schaft 2 kann unmittelbar an den Arbeitsabschnitt 6 angrenzen oder mittels eines kurzen Ãbergangsbereichs 8 mit dem Arbeitsabschnitt 6 verbunden sein.The
Der Schaft 2 und der Arbeitsabschnitt 6 unterscheiden sich in ihrer Funktion und einer damit einhergehenden geometrischen Gestalt. Der Schaft 2 dient primÀr der Halterung des SpitzmeiÃels 1 in einer Handwerkzeugmaschine. Die geometrische Gestalt ist sehr einfach gehalten und im Wesentlichen uniform entlang der LÀngsachse, beispielsweise zylindrisch oder prismatisch mit einem quadratischen oder hexagonalen Querschnitt. Die SchlagflÀche 5 bildet die freiliegende und von der Spitze 3 abgewandte StirnflÀche des Schafts 2. Die SchlagflÀche 5 kann kalottenförmig ausgebildet sein. Der beispielhafte Schaft 2 hat eine Nut 9, welche lÀngs der LÀngsachse 7 geschlossen ist. Der Schaft 2 kann in einen Werkzeughalter des ElektromeiÃels eingesetzt werden. Ein Verriegelungskörper, z.B. eine Klinke oder eine Kugel, greifen in die Nut 9 ein und sichern den SpitzmeiÃel 1 in dem Werkzeughalter. Der beispielhafte Schaft 2 hat einen ringförmigen Kragen 10, der radial ÃŒber den Schaft 2 vorsteht. Andere Werkzeughalter verriegeln den SpitzmeiÃel 1 mittels eines verschwenkbaren BÃŒgels, welcher den Kragen 10 auf der Seite der Spitze 3 hintergreift. Der Schaft 2 kann sowohl die Nut 9 als auch den Kragen 10 oder nur eines der beiden Verriegelungsmittel aufweisen.The
Der Arbeitsabschnitt 6 dringt beim Abbau von mineralischen Materialien oder Gestein in diese ein. Der Arbeitsabschnitt 6 ist fÌr ein effizientes Aufbrechen eines Untergrunds und in Hinblick auf eine verringerte Tendenz zum Verklemmen in dem Untergrund ausgebildet. Die geometrische Gestalt des Arbeitsabschnitts 6 ist entsprechend deutlich verschieden zu der Grundform des Schafts 2. Der Arbeitsabschnitt 6 weist insbesondere keine Drehsymmetrie um die LÀngsachse 7 auf. Der Arbeitsabschnitt 6 hat einen Rumpf 11 und genau zwei von dem Rumpf 11 radial abstehende FlÌgel 12. Der Rumpf 11 liegt auf der LÀngsachse 7. Die FlÌgel 12 sind V-förmig angeordnet. Die beiden FlÌgel 12 haben vorzugsweise eine identische Gestalt und sind vorzugsweise zueinander spiegelsymmetrisch angeordnet.The working
FÃŒr die Beschreibung des Arbeitsabschnitts 6 wird ein Koordinatensystem eingefÃŒhrt. Das Koordinatensystem orientiert sich an einem den Arbeitsabschnitt 6 umschreibenden Quader mit einer LÀngsachse 7, einer Querachse 13 und einer Hochachse 14. Die drei Achsen sind zueinander orthogonal und schneiden sich in einem Punkt. Die LÀngsachse 7 ist durch die Verbindungslinie von der Spitze 3 zu der Mitte der SchlagflÀche 5 festgelegt. Axial und radial beziehen sich auf die LÀngsachse 7. Die Querachse 13 und die Hochachse 14 entsprechen den Richtungen ausgehend von der LÀngsachse 7, unter welchen die Abmessung des Arbeitsabschnitts 6 parallel zu der Querachse 13 (Breite 15) maximal ist und die Abmessung des Arbeitsabschnitts 6 parallel zu der Hochachse 14 (Höhe 16) minimal ist. Die Querachse 13 ist parallel zu einer Verbindungslinie der gegenÃŒberliegenden FlÃŒgelspitzen 17. Die LÀnge 25 des Arbeitsabschnitts 6 ist vorzugsweise deutlich gröÃer als die Breite 15 des Arbeitsabschnitts 6, z.B. wenigstens fÃŒnffach so groÃ. Die Breite 15 des Arbeitsabschnitts 6 ist vorzugsweise gröÃer als die Höhe 16, z.B. eineinhalbfach so groÃ. Die von der LÀngsachse 7 und der Querachse 13 aufgespannte Ebene wird nachfolgend als Horizontalebene H und die von der LÀngsachse 7 und der Querachse 13 aufgespannte Ebene als Vertikalebene V bezeichnet. Der Arbeitsabschnitt 6 ist bezÃŒglich der Horizontalebene H asymetrisch. Der Arbeitsabschnitt 6 ist vorzugsweise bezÃŒglich der Vertikalebene V spiegelsymmetrisch ausgebildet.A coordinate system is introduced for the description of
Der beispielhafte Arbeitsabschnitt 6 hat einen FÌhrungsbereich 18 mit einer lÀngs der LÀngsachse 7 konstanten Breite 15 (
Der Rumpf 11 ist ein im Wesentlichen stabförmiger Körper mit einem kreisförmigen Querschnitt, der im Bereich der Spitze 3 kegelförmig zulÀuft. Die Spitze des Rumpfs 11 bildet die Spitze 3 des SpitzmeiÃels 1. Der Querschnitt des Rumpfs 11 kann auch elliptisch mit einem AspektverhÀltnis von höchstens 1:1,2 sein. Der Rumpf 11 definiert die LÀngsachse 7 des MeiÃels 1. Der Rumpf 11 und die LÀngsachse 7 sind koaxial.The
Die beispielhaften FlÃŒgel 12 sind im Wesentlichen plattenförmige Körper mit jeweils einer Oberseite 20, einer Unterseite 21 und einer FlÃŒgelspitze 17. Die FlÃŒgelspitze 17 bezeichnet die ÀuÃere radiale Kante der FlÃŒgel 12. The
Eine StÀrke 22, d.h. der lokale Abstand der Oberseite 20 zu der Unterseite 21, der FlÌgel 12 ist deutlich geringer als die Höhe 16 des Rumpfes 11 bzw. des Arbeitsabschnitts 6. Die StÀrke 22 kann in radialer Richtung weitgehend konstant sein. Die Oberseite 20 und die Unterseite 21 können als nÀherungsweise parallel bezeichnet werden. Die Oberseite 20 und die Unterseite 21 können eben sein oder eine nÀherungsweise gleiche KrÌmmung entlang der radialen Richtung aufweisen. Die FlÌgel 12 grenzen unmittelbar an den Rumpf 11 an. Die FlÌgel 12 unterteilen die freiliegende OberflÀche des Rumpfes 11 in einen RÌcken 23 und einen Bauch 24. Der RÌcken 23 liegt oberhalb einer Horizontalebene H, der Bauch 24 liegt unterhalb der Horizontalebene H. Die Horizontalebene H ist senkrecht zu der Hochachse 14 und wird von der LÀngsachse 7 und der Querachse 13 aufgespannt.A
Vorzugsweise sind die FlÃŒgel 12 ÃŒber die gesamte LÀnge 25 oder einen GroÃteil des Arbeitsabschnitts 6 ausgedehnt. Die axiale Abmessung der FlÃŒgel 12 ist deutlich gröÃer als ihre radiale Abmessung, z.B. ist die axiale Abmessung wenigstens fÃŒnffach gröÃer als die radiale Abmessung. Die radiale Abmessung 26 der FlÃŒgel 12 und der Radius des Rumpfes 11 sind etwa gleich, z.B. haben einen relativen Unterschied von weniger als 25%. Die radiale Abmessung 26 der FlÃŒgel 12 nimmt von der Spitze 3 zu dem Schaft 2 vorzugsweise in der gleichen Weise wie der Radius des kegelförmigen Rumpfes 11 ab. Ein VerhÀltnis der Abmessungen kann konstant sein.The
Ein Schwerpunkt der FlÃŒgel 12 liegt oberhalb der Horizontalebene H. Die FlÃŒgel 12 sind hauptsÀchlich oberhalb der Horizontalebene H angeordnet, d.h. ein Anteil des FlÃŒgels 12 oberhalb der Horizontalebene H ist gröÃer als der Anteil des FlÃŒgels 12 unterhalb der Horizontalebene H. Eine Linie durch die FlÀchenschwerpunkte der FlÃŒgel 12 in den aufeinanderfolgenden Querschnitten kann abschnittsweise, insbesondere nahe der Spitze 3, auf der Horizontalebene H liegen und ist ansonsten oberhalb der Horizontalebene H. Die FlÃŒgelspitzen 17 liegen von dem Schaft 2 bis zu der Spitze 3 auf und oberhalb der Horizontalebene H jedoch nicht unterhalb der Horizontalebene H. A focal point of the
Die beiden FlÌgel 12 sind V-förmig angeordnet, insbesondere in dem FÌhrungsbereich 18. Ein Diederwinkel 27 zwischen den beiden FlÌgeln 12 ist geringer als 180 Grad. Der Diederwinkel 27 liegt zwischen 120 Grad und 170 Grad. Der Diederwinkel 27 wird in Umfangsrichtung um die LÀngsachse 7 bestimmt. Der Arbeitsabschnitt 6 weist aufgrund der V-förmig angeordneten FlÌgel 12 keine Drehsymmetrie auf. Der Arbeitsabschnitt 6 hat keine zweizÀhlige Drehsymmetrie um die LÀngsachse 7, welche eine Drehung des Arbeitsabschnitts 6 um 180 Grad mit sich selbst zur Deckung bringen wÌrde. Der Arbeitsabschnitt 6 hat ferner aufgrund der V-förmig angeordneten FlÌgel 12 keine Spiegelsymmetrie bezÌglich der Horizontalebene H. The two
Die relative V-förmige Anstellung der beiden FlÌgel 12 zueinander nimmt in der Richtung von der Spitze 3 zu dem Schaft 2 hin zu. Der Diederwinkel 27 ist in dem Spitzenbereich 19 vorzugsweise konstant. Der Diederwinkel 27 bleibt konstant wÀhrend sich die Breite 15 Àndert. Die FlÌgel 12 können in einer Ebene, z.B. der Horizontalebene H, liegen. Der Diederwinkel 27 ist beispielsweise zwischen 170 Grad und 180 Grad, vorzugsweise 180 Grad. In dem FÌhrungsbereich 18 verringert sich der Diederwinkel 27 kontinuierlich. Angrenzend an den Schaft 2 ist der Diederwinkel 27 minimal und liegt in einem Bereich zwischen 120 Grad und 150 Grad. Die Breite 15 des Arbeitsabschnitts 6 ist vorzugsweise konstant, wenn sich der Diederwinkel 27 Àndert.The relative V-shaped adjustment of the two
Die FlÌgel 12 sind gegenÌber der LÀngsachse 7 um einen Anstellwinkel 29 gekippt. Der Anstellwinkel 29 ist in der Seitenansicht zu erkennen. Die FlÌgelspitzen 17 liegen in einer zu der LÀngsachse 7 um den Anstellwinkel 29 geneigten Ebene. Ein vertikaler Abstand 30, d.h. entlang der Hochachse 14, der FlÌgelspitzen 17 zu der Horizontalebene H nimmt von dem der Spitze 3 zu dem Schaft 2 vorzugsweise, insbesondere innerhalb des FÌhrungsbereichs, kontinuierlich zu.The
Der Arbeitsabschnitt 6 liegt in dem Untergrund mit den Oberseiten 20 der FlÃŒgel 12 und dem Bauch 24 des Rumpfes 11 an der Lochwand an. Die Unterseiten 21 der FlÃŒgel 12 sind von der Lochwand beabstandet. Soweit die Unterseiten 21 an der Lochwand anliegen, ÃŒben sie eine verglichen zu den Oberseiten 20 geringere Kraft auf die Lochwand aus.The working
Der RÌcken 23 kann in einem an den Schaft 2 angrenzenden Bereich mit einer Mulde 31 versehen sein. Die Mulde 31 ist vorzugsweise symmetrisch zu der Vertikalebene V. Die Mulde 31 bildet eine konkave OberflÀche an dem RÌcken 23 aus. Der radiale Abstand der OberflÀche der Mulde 31 zu der LÀngsachse 7 liegt im Bereich 18 zwischen 66 % und 85 % des Radius des Rumpfes 11. The back 23 can be provided with a
Der Bauch 24 kann in einem an den Schaft 2 angrenzenden Bereich mit einer Mulde 32 versehen sein. Die Mulde 32 ist vorzugsweise symmetrisch zu der Vertikalebene V. Die Mulde 32 bildet eine konkave OberflÀche an dem Bauch 24 aus. Der radiale Abstand der OberflÀche der Mulde 32 zu der LÀngsachse 7 liegt im Bereich 18 zwischen 66 % und 85 % des Radius des Rumpfes 11. The
Claims (8)
- Chisel (1) having
a shank (2), a striking surface (5), a tip (3),
a longitudinal axis (7) extending through the striking surface (5) and the tip (3),
a working portion (6), which has a body (11) arranged along the longitudinal axis (7) and two wings (12) that extend along the body (11) and protrude radially from the body (11), wherein the two wings (12) are arranged in a V shaped manner, wherein a dihedral angle (27) between the two wings (12) is less than 180 degrees, characterized in that the dihedral angle (27) increases from the shank (2) to the tip (3) in a region (18). - Chisel according to one of the preceding claims, characterized in that, in a region (18), the wings (12) have a cross section that varies along the longitudinal axis (7), wherein each of the cross sections in this region (18) overlaps only partially with the other cross sections.
- Chisel according to one of the preceding claims, characterized in that the working portion (6) does not have two-fold rotational symmetry about the longitudinal axis (7).
- Chisel according to one of the preceding claims, characterized in that the wings (12) are arranged in a mirror symmetric manner with respect to a plane of symmetry (V) containing the longitudinal axis (7).
- Chisel according to one of the preceding claims, characterized in that the two wings (12) are arranged primarily above a horizontal plane (H) containing the longitudinal axis (7).
- Chisel according to one of the preceding claims, characterized in that the wings (12) are inclined along the longitudinal axis (7) at a setting angle (29) with respect to the longitudinal axis (7).
- Chisel according to one of the preceding claims, characterized in that a radial dimension of the two wings (12) increases from the shank (2) to the tip (3).
- Chisel (1) according to one of the preceding claims, characterized in that the body (11) is formed in a substantially rotationally symmetric manner with respect to the longitudinal axis (7).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP16183147.4A EP3281748A1 (en) | 2016-08-08 | 2016-08-08 | Chisel |
PCT/EP2017/069300 WO2018029022A1 (en) | 2016-08-08 | 2017-07-31 | Tool bit |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3496902A1 EP3496902A1 (en) | 2019-06-19 |
EP3496902B1 true EP3496902B1 (en) | 2020-04-01 |
Family
ID=56615881
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16183147.4A Withdrawn EP3281748A1 (en) | 2016-08-08 | 2016-08-08 | Chisel |
EP17754628.0A Active EP3496902B1 (en) | 2016-08-08 | 2017-07-31 | Chisel |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16183147.4A Withdrawn EP3281748A1 (en) | 2016-08-08 | 2016-08-08 | Chisel |
Country Status (4)
Country | Link |
---|---|
US (1) | US20200122310A1 (en) |
EP (2) | EP3281748A1 (en) |
CN (1) | CN109496177A (en) |
WO (1) | WO2018029022A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
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 |
USD921465S1 (en) | 2019-05-06 | 2021-06-08 | Milwaukee Electric Tool Corporation | Mortar knife |
EP3978195A1 (en) * | 2020-09-30 | 2022-04-06 | Hilti Aktiengesellschaft | Chisel and tool holder |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB512830A (en) * | 1938-03-17 | 1939-09-27 | John Joseph Rawlings | Improvements in percussion drills |
DE733686C (en) * | 1940-04-04 | 1943-04-01 | Ernst Doering Fa | Hardened profile chisel |
FR905582A (en) * | 1943-06-04 | 1945-12-07 | Flottmann Ag | Spade hammer for extracting clay and other rocks |
DE4120310A1 (en) * | 1991-06-20 | 1993-01-07 | Solida Werkzeugtechnik | CHANNEL CHISES FOR THE PRODUCTION OF CONSTRUCTION SLOTS |
DE10057124A1 (en) * | 1999-11-17 | 2001-05-23 | Hawera Probst Gmbh | Chisel for use with electro-pneumatic hammer drill has head and/or shaft with axial profiled apertures, ribs, or webs |
CN2607244Y (en) * | 2003-03-16 | 2004-03-24 | ä¿å¿ æ | Convenient chisel |
DE10318091A1 (en) * | 2003-04-17 | 2004-11-18 | Robert Bosch Gmbh | flat chisel |
DE602004023711D1 (en) * | 2004-07-13 | 2009-12-03 | Black & Decker Inc | Chisel |
CN200939594Y (en) * | 2006-08-22 | 2007-08-29 | æ±æž æ | Impact chisel for electric hammer |
EP2502708B1 (en) | 2011-03-22 | 2017-02-01 | Black & Decker Inc. | Chisels |
DE102012202300A1 (en) * | 2012-02-15 | 2013-08-22 | Hilti Aktiengesellschaft | chisel |
-
2016
- 2016-08-08 EP EP16183147.4A patent/EP3281748A1/en not_active Withdrawn
-
2017
- 2017-07-31 EP EP17754628.0A patent/EP3496902B1/en active Active
- 2017-07-31 CN CN201780044253.0A patent/CN109496177A/en active Pending
- 2017-07-31 WO PCT/EP2017/069300 patent/WO2018029022A1/en unknown
- 2017-07-31 US US16/266,964 patent/US20200122310A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
None * |
Also Published As
Publication number | Publication date |
---|---|
EP3281748A1 (en) | 2018-02-14 |
CN109496177A (en) | 2019-03-19 |
WO2018029022A1 (en) | 2018-02-15 |
US20200122310A1 (en) | 2020-04-23 |
EP3496902A1 (en) | 2019-06-19 |
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