EP3433057B1 - Chisel - Google Patents

Chisel Download PDF

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Publication number
EP3433057B1
EP3433057B1 EP17712130.8A EP17712130A EP3433057B1 EP 3433057 B1 EP3433057 B1 EP 3433057B1 EP 17712130 A EP17712130 A EP 17712130A EP 3433057 B1 EP3433057 B1 EP 3433057B1
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EP
European Patent Office
Prior art keywords
longitudinal axis
webs
chisel
circumferential direction
web
Prior art date
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Application number
EP17712130.8A
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German (de)
French (fr)
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EP3433057A1 (en
Inventor
Zsolt Kosa
Aviral Shrot
Carsten Peters
Attila Kenéz
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
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Hilti AG
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Publication date
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Publication of EP3433057A1 publication Critical patent/EP3433057A1/en
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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

Definitions

  • the present invention relates to a chisel for removing mineral building materials, for example concrete, in particular a pointed chisel, as described in the preamble of claim 1 and from GB512,830 famous.
  • Pointed chisel with a punctiform tip are, for example, from U.S. 6,981,496 U.S. 9,221,164 , U.S. 9,085,074 , CN 201922428 U , DE 1846211 U , DE 202013003876 U1 , DE 19914522 A1 , DE 828385 A and DE 463571 A famous.
  • the chisels are driven into a subsoil by means of a pneumatic or electropneumatic chisel hammer.
  • the chisel must withstand the impact forces, tensile forces and lateral forces that occur. Increasing the cross section or core diameter increases stability. However, this also increases the mass of the chisel, which requires a more powerful chisel hammer.
  • the chisel according to the invention having the features of claim 1, has a point, a working portion and a striking surface and a longitudinal axis passing through the point, the working portion and the striking surface.
  • the working section has a plurality of webs which run along the longitudinal axis and are distributed in the circumferential direction around the longitudinal axis. In at least one of the webs, a dimension in the circumferential direction increases by at least one third, for example by at least half, by at least three quarters, with increasing distance from the longitudinal axis.
  • the webs become significantly slimmer towards the longitudinal axis, which means they are significantly wider towards the outside.
  • a widest point is at least one-third wider than the narrowest point.
  • the chisel enables a structure with a low mass, in particular a small core, and still achieves the required mechanical stability.
  • the core contributes less than one third to the mass of the working section, ie its circular area is less than one third of the cross-sectional area through the working section.
  • a height of the webs of the webs is preferably at least as large as half the core diameter, ie the ratio of the outer diameter of the Working section to core diameter is greater than two to one, preferably greater than five to two.
  • the grooves running between the webs cut correspondingly deep into the chisel.
  • the at least one web has a first side surface pointing in a circumferential direction and a second side surface pointing counter to the circumferential direction.
  • the first side surface and the second side surface are inclined towards one another and diverge with increasing distance from the longitudinal axis.
  • the side surfaces preferably point predominantly in the circumferential direction, i.e. the perpendicular to the side surfaces and the circumferential direction enclose an angle of less than 45 degrees.
  • the sloping side surfaces together may form one third of the total surface area of the web, for example the first side surface may form at least one sixth of the surface area of the web and/or the second side surface may form at least one sixth of the surface area of the web.
  • an angular dimension in the circumferential direction about the longitudinal axis can remain the same or increase as the distance from the longitudinal axis increases.
  • the working section has at least three webs.
  • the webs are distributed at identical angular distances around the longitudinal axis.
  • One embodiment provides that the webs are inclined at an angle of less than 10 degrees relative to the longitudinal axis.
  • the webs can rotate around the longitudinal axis by less than 90 degrees.
  • One embodiment provides that the webs are wavy.
  • a slope averaged over the longitudinal axis is preferably less than 5 degrees.
  • a groove is arranged between two adjacent webs.
  • the groove has a continuously decreasing circumferential dimension towards the longitudinal axis.
  • the opposite side faces of the webs are inclined towards one another, preferably at an angle of more than 10 degrees, preferably more than 20 degrees.
  • the webs can be produced by rolling or embossing the grooves.
  • the chisel 1 shows a side view of an exemplary chisel 1 for removing concrete, rock or other mineral building materials.
  • the chisel 1 has a tip 2 at one end and a striking surface 3 at an end remote from the tip 2 .
  • the chisel 1 is applied with its tip 2 to a substrate 4 .
  • a hammer mechanism of a machine tool strikes the striking surface 3 of the chisel 1 in a striking direction 5 .
  • the tip 2 is driven into the ground 4 in the striking direction 5 .
  • a working section 6 adjoining the tip 2 spreads the base 4 radially until the base 4 breaks due to the stresses.
  • the chisel 1 is essentially a rod-shaped body.
  • the chisel 1 has a longitudinal axis 7 which runs through the tip 2 and the face 3 .
  • the following spatial descriptions axial, radial, radial direction and circumferential direction relate to this longitudinal axis 7.
  • the radial direction has its origin in the longitudinal axis 7 and points outwards.
  • the bit 1 has its greatest dimension along the longitudinal axis 7; the dimensions perpendicular to the longitudinal axis 7 are significantly smaller.
  • the chisel 1 has, starting from the striking surface 3 along the longitudinal axis 7 , the striking surface 3, a shank 8, a working section 6 and the tip 2 in succession.
  • the chisel 1 is described below divided into several parts which have certain geometric or functional differences. However, the parts preferably form a monolithic body without joining zones, this applies in particular to the base body 9 consisting of the shaft 8 and the working section 6.
  • the base body 9 is made of steel and the parts are not joined, i.e. neither welded, soldered, screwed , etc..
  • the tip 2 can be manufactured monolithically with the base body 9 .
  • the exemplary chisel 1 is a so-called pointed chisel.
  • the chisel 1 has exactly one tip 2 which lies on the longitudinal axis 7 .
  • the tip 2 is largely in the form of a solid of revolution; for example, the tip 2 is conical, dome-shaped or pyramid-shaped.
  • the mutually orthogonal dimensions of the tip 2 in the planes perpendicular to the longitudinal axis 7 are approximately the same. Preferably, the mutually orthogonal dimensions differ by less than one-third.
  • the shaft 8 is a rod-shaped body.
  • a longitudinal axis of the shank 8 coincides with the longitudinal axis 7 of the bit 1 , ie the shank 8 is coaxial with the longitudinal axis 7.
  • the illustrated shank 8 is prismatic with a hexagonal cross-section.
  • the prismatic shaft 8 can have a square, hexagonal, octagonal, circular or elliptical cross-section, among others.
  • the striking surface 3 is formed by an end face of the shank 8 of the chisel 1 .
  • the striking surface 3 is oriented essentially perpendicularly to the longitudinal axis 7 .
  • the impact surface 3 can be convex or flat.
  • a shank 10 directly adjoins the striking surface 3 .
  • the shank 10 is inserted into a tool holder of the machine tool.
  • the shank 10 can be provided with structures which serve to secure the chisel 1 in the tool holder.
  • the shank 10 has one or more locking grooves 11 which are closed on both sides along the longitudinal axis 7 .
  • the locking grooves 11 have a length of 1 cm to 4 cm, for example.
  • an annular collar can be provided.
  • the working section 6 is a coherent, rod-shaped body.
  • a longitudinal axis of the working section 6 coincides with the longitudinal axis 7 of the chisel 1 , ie the working section 6 is coaxial with the longitudinal axis 7.
  • the working section 6 preferably has its greatest dimension length 12 along the longitudinal axis 7; the dimensions transverse to the longitudinal axis 7 are significantly less than the length 12, eg at most one third.
  • the working section 6 has a cylindrical core 13 and a plurality of webs 14.
  • the webs 14 extend over the entire length 12 of the working section 6.
  • the webs 14 are distributed around the core 13 in the circumferential direction 15 .
  • Between webs 14 that are adjacent in the circumferential direction 15 is a groove 16.
  • the arrangement of the webs 14 results in a star-shaped cross-sectional profile over the entire length 12 , such as the chisel 1 of FIG 1 in the Figures 2 to 5 is shown.
  • the surface of the working section 6 is composed of the surface 17 of the webs 14 .
  • the surface shown as an example is formed by the four webs 14 and their surfaces 17 .
  • the webs 14 completely enclose the core 13 lying on the longitudinal axis 7 .
  • the surface 17 of the web 14 has two side surfaces 18, 19 facing away from one another and a back surface 20.
  • the side surfaces 18, 19 and the back surfaces run along the longitudinal axis 7; ie the side surfaces 18, 19 and the back surface 20 have their largest dimension along the longitudinal axis 7.
  • a first of the side surfaces 18 points predominantly in the circumferential direction 15; a second of the side surfaces 19 points predominantly against the circumferential direction 15.
  • the rear surface 20 points predominantly in the radial direction.
  • a perpendicular to a point on the surface 17 can usually be broken down into a vector component in the radial direction and a vector component in the circumferential direction 15 . In this context, predominantly means that the vector component with the larger contribution in terms of absolute value specifies the direction in which the surface 17 points at the point.
  • the surface 17 can have transition surfaces 21 which connect the side surfaces 18, 19 of adjacent webs 14 to one another.
  • the transition surfaces 21 form the bottom of the grooves 16.
  • the transition surfaces 21 can predominantly point in the radial direction.
  • the webs 14 have a cross-section that remains the same or largely remains the same along the longitudinal axis 7 .
  • the cross section is defined by the side surfaces 18, 19 and the rear surface 20 of the web 14 . Accordingly, the entire surface of the working section 6 is defined solely by the webs 14 .
  • the exemplary web 14 has a generally trapezoidal cross-section.
  • the back panel 20 forms one of the bases; the side surfaces 19 form the legs.
  • the Rear surface 20 can be convex.
  • the exemplary side surfaces 19 can be flat.
  • An imaginary foot surface 22, opposite the back surface 20 forms the other of the bases.
  • the bases 22 connect, for example, the deepest points of the grooves 16.
  • the imaginary bases 22 of the webs 14 enclose the core 13.
  • the core 13 is preferably the largest convex prismatic body that can be placed within the surface of the working portion 6 .
  • the core 13 touches the grooves 16 at the points closest to the longitudinal axis 7 , ie at their deepest points. If the webs 14 are arranged symmetrically, the core 13 is a circular cylinder which touches all of the grooves 16 .
  • a radius 23 of the core 13 is equal to the radial distance of the grooves 16 to the longitudinal axis 7.
  • the core diameter is twice the radius 23.
  • the core 13 accounts for a small proportion of the mass of the working section 6.
  • the core diameter is preferably less than half the outer diameter 24 of the working section 6, eg less than 40% of the outer diameter 24.
  • the cross-sectional area of the core 13 accounts for less than one One-third of the total cross-sectional area, eg, less than one-fourth.
  • the webs 14 accordingly contribute to at least two-thirds of the cross-sectional area and the mass of the working section 6 .
  • the web 14 has a waist with the smallest dimension 25 in the circumferential direction 15.
  • the waist is preferably close to the core 13.
  • the web 14 widens with increasing distance 26 to the longitudinal axis 7 starting from the waist.
  • the dimension 27 in the circumferential direction 15 preferably increases continuously.
  • the dimension 27 in the circumferential direction 15 designates the distance, in a linear measure, between the side surfaces 18, 19 facing away from one another at the respective radial distance 26 from the longitudinal axis 7.
  • the widest point (shoulder) with the greatest dimension 28 in the circumferential direction 15 is adjacent the back surface 20 on.
  • the ratio of the shoulder to the waist is clearly pronounced.
  • the shoulder is at least one third wider than the waist, preferably by half, eg three quarters.
  • the increase in circumferential 15 dimension is preferably over a majority of the height 29 (radial dimension) of the web 14, at least half of the height 29.
  • the circumferential 15 dimension 27 may increase from the waist toward the core 13 .
  • the side surfaces 18, 19 are inclined towards one another and, viewed from the core 13 , move away from one another.
  • An imaginary intersection of the sloping side surfaces 18, 19 lies on the side of the root surface 22, preferably inside the core 13.
  • the two Side surfaces 18, 19 of the four webs 14 enclose an angle 30 between 33 degrees and 54 degrees. With a number N of webs 14 , the angle 30 can be selected, for example, between 75% of 180/N degrees and 120% of 180/N degrees.
  • the mutually inclined side surfaces 18, 19 have a dominant portion of the surface 17 of the webs 14.
  • the two side surfaces 18, 19 together form at least half of the entire surface 17.
  • the side surfaces 18, 19 are over a significant portion of the height 29 of the web 14 inclined to each other in the manner previously described.
  • side surfaces 18, 19 are inclined towards one another for at least half, for example at least three quarters of the height 29 of the web 14 .
  • the distance 31 from the waist to the widest point may be greater than half the height 29 , e.g. greater than three quarters the height 29.
  • the web 14 is significantly wider on the back surface 20 than on the foot surface 22.
  • the smallest width is, for example, between 20% and 75% of the largest width.
  • the height 29 designates the largest dimension in the radial direction of the webs 14.
  • the height 29 can be determined as the difference between the radial distance of the rear surface 20 from the longitudinal axis 7 and the radial distance of the groove 16 from the longitudinal axis 7 .
  • the height 29 largely corresponds to the radial dimension of the side surfaces 18, 19.
  • the grooves 16 widen from the core 13 towards their opening.
  • a dimension 32 in the circumferential direction 15 of the grooves 16 increases with increasing radial distance 26 from the longitudinal axis 7 .
  • Mutually opposite side surfaces 18, 19 of two adjacent webs 14 are correspondingly inclined towards one another and, viewed from the core 13 , move away from one another.
  • the inclination of the opposite side faces 19 is preferably greater than 10 degrees, eg greater than 20 degrees and eg less than 45 degrees.
  • the slope favors efficient rolling and forging processes.
  • the exemplary working section 6 has a four-fold rotational symmetry about the longitudinal axis 7.
  • the four webs 14 are of identical design and are each offset by 90 degrees to their respective adjacent webs 14 in the circumferential direction 15 .
  • the working portion 6 can have at least three ribs and at most eight ribs.
  • the webs 14 are preferably of identical design, in particular if there is an odd number. If there are an even number, in particular if there are four, the webs 14 can be of identical design in pairs.
  • the webs 14 are distributed equidistantly in the circumferential direction 15 .
  • the working section 6 can taper in a region 33 adjoining the tip 2 .
  • the height 29 of the webs 14 decreases continuously in the direction of impact 5 , for example down to zero adjacent to the tip 2.
  • the grooves 16 thus become ever flatter.
  • the radius 23 of the core 13 can be the same over the entire length 12 of the working section 6 .
  • the core 13 is exposed near the tip 2 .
  • a length of the conical area 33 can be between one third and one half of the length 12 of the working section 6 .
  • the height 29 of the webs 14 is constant in the other remaining area 34 of the working section 6 .
  • the webs 14 can be parallel to the longitudinal axis 7 .
  • the webs 14 can also be inclined at an angle of inclination 35 with respect to the longitudinal axis 7 .
  • the inclination 35 can be determined, for example, based on the highest point 36 of the back surface 20, the side surfaces 18, 19 or a course of the centroid 37 in the cross sections along the longitudinal axis 7 .
  • the inclination 35 of the web 14 relative to the longitudinal axis 7 is preferably less than 10 degrees.
  • the web 14 runs around the longitudinal axis 7 by less than 90 degrees over the entire length 12 of the working section 6 .
  • the webs 14 shown as an example are wavy.
  • the web 14 has multiple alternating left-hand sections 38 and right-hand sections 39.
  • Within a left-hand section 38 the web 14 is inclined in a clockwise direction about the longitudinal axis 7 ; within a clockwise section 39 , one web 14 is inclined in a counterclockwise direction.
  • the slope 35 is determined, for example, using the highest point 36 .
  • the inclination 35 of the web 14 relative to the longitudinal axis 7 can change continuously.
  • the absolute maximum inclination 35 of the web 14 relative to the longitudinal axis 7 is preferably less than 10 degrees.
  • the webs 14 thus have turning points on the left, for example in plane III-III, and turning points on the right, for example in plane IV-IV.
  • the turning points on the left preferably lie on a straight line parallel to the longitudinal axis 7 ; the turning points on the right preferably lie on a straight line parallel to the longitudinal axis 7 .
  • the deflection in the circumferential direction 15 of the left-hand sections 38 and the right-hand sections 39 preferably compensates for one another, ie the deflections are of the same magnitude.
  • the web 14 runs on average parallel to the longitudinal axis 7.
  • An inclination 35 averaged over the length 12 of the working section 6 is preferably less than 5 degrees, for example less than 2 degrees, preferably equal to zero.
  • the web 14 is shifted in the left-hand turning points by less than a quarter of its width relative to itself in the right-hand turning points in the circumferential direction 15 , for example by less than 15%, preferably by more than 7%
  • a substantial sector of the grooves 16, e.g. more than 50% of the cross-sectional area of the groove 16, runs parallel to the longitudinal axis 7 over the entire length 12 of the working section 6 .

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

Description

GEBIET DER ERFINDUNGFIELD OF THE INVENTION

Die vorliegende Erfindung betrifft einen Meißel zum Abbau von mineralischen Bauwerkstoffen, z.B. von Beton, insbesondere einen Spitzmeißel, wie im Oberbegriff von Anspruch 1 beschrieben und aus GB 512,830 bekannt.The present invention relates to a chisel for removing mineral building materials, for example concrete, in particular a pointed chisel, as described in the preamble of claim 1 and from GB512,830 famous.

Spitzmeißel mit einer punktförmigen Spitze sind beispielsweise aus der US 6,981,496 US 9,221,164 , US 9,085,074 , CN 201922428 U , DE 1846211 U , DE 202013003876 U1 , DE 19914522 A1 , DE 828385 A und DE 463571 A bekannt. Die Meißel werden mittels eines pneumatischen oder elektropneumatischen Meißelhammers in einen Untergrund getrieben. Der Meißel muss den dabei auftretenden Schlagkräften, Zugkräften und Querkräften widerstehen. Ein Vergrößern des Querschnitts oder des Kerndurchmessers erhöht zwar die Stabilität. Allerdings wächst damit auch die Masse des Meißels, wofür ein leistungsstärkerer Meißelhammer erforderlich ist.Pointed chisel with a punctiform tip are, for example, from U.S. 6,981,496 U.S. 9,221,164 , U.S. 9,085,074 , CN 201922428 U , DE 1846211 U , DE 202013003876 U1 , DE 19914522 A1 , DE 828385 A and DE 463571 A famous. The chisels are driven into a subsoil by means of a pneumatic or electropneumatic chisel hammer. The chisel must withstand the impact forces, tensile forces and lateral forces that occur. Increasing the cross section or core diameter increases stability. However, this also increases the mass of the chisel, which requires a more powerful chisel hammer.

OFFENBARUNG DER ERFINDUNGDISCLOSURE OF THE INVENTION

Der erfindungsgemäße Meißel, der die Merkmale des Anspruchs 1 aufweist, hat eine Spitze, einen Arbeitsabschnitt und eine Schlagfläche und eine durch die Spitze, den Arbeitsabschnitt und die Schlagfläche verlaufende Längsachse. Der Arbeitsabschnitt hat mehrere längs der Längsachse verlaufende und in Umfangsrichtung um die Längsachse verteilt angeordnet Stege. Bei wenigstens einem der Stege nimmt eine Abmessung in Umfangsrichtung um wenigstens ein Drittel, beispielsweise um wenigstens die Hälfte, um wenigstens drei Viertel, mit zunehmendem Abstand zu der Längsachse zu. Die Stege werden zur Längsachse hin deutlich schlanker ergo nach Außen hin deutlich breiter. Eine breiteste Stelle ist um wenigstens ein Drittel breiter wie die schmalste Stelle. Der Meißel ermöglicht einen Aufbau mit einem geringen Masse, insbesondere einem kleinen Kern, und erreicht dennoch die geforderte mechanische Stabilität.The chisel according to the invention, having the features of claim 1, has a point, a working portion and a striking surface and a longitudinal axis passing through the point, the working portion and the striking surface. The working section has a plurality of webs which run along the longitudinal axis and are distributed in the circumferential direction around the longitudinal axis. In at least one of the webs, a dimension in the circumferential direction increases by at least one third, for example by at least half, by at least three quarters, with increasing distance from the longitudinal axis. The webs become significantly slimmer towards the longitudinal axis, which means they are significantly wider towards the outside. A widest point is at least one-third wider than the narrowest point. The chisel enables a structure with a low mass, in particular a small core, and still achieves the required mechanical stability.

Der Kern trägt in einer Ausführung weniger als ein Drittel zu der Masse des Arbeitsabschnitts bei, d.h. seine Kreisfläche ist geringer als ein Drittel der Querschnittsfläche durch den Arbeitsabschnitt. Eine Höhe der Stege der Stege ist vorzugsweise wenigstens so groß wie der halbe Kerndurchmesser, d.h. das Verhältnis des Außendurchmessers der Arbeitsabschnitts zu dem Kerndurchmesser ist größer als zwei zu eins, vorzugsweise größer fünf zu zwei. Die zwischen den Stegen verlaufenden Rillen schneiden entsprechend tief in den Meißel ein.In one embodiment, the core contributes less than one third to the mass of the working section, ie its circular area is less than one third of the cross-sectional area through the working section. A height of the webs of the webs is preferably at least as large as half the core diameter, ie the ratio of the outer diameter of the Working section to core diameter is greater than two to one, preferably greater than five to two. The grooves running between the webs cut correspondingly deep into the chisel.

Erfindungsgemäß weist der wenigstens eine Steg eine erste, in eine Umfangsrichtung weisende, Seitenfläche und eine zweite, entgegen die Umfangsrichtung weisende, Seitenfläche auf.According to the invention, the at least one web has a first side surface pointing in a circumferential direction and a second side surface pointing counter to the circumferential direction.

Die erste Seitenfläche und die zweiten Seitenfläche sind zueinander geneigt und laufen mit zunehmendem Abstand zu der Längsachse auseinander. Die Seitenflächen weisen vorzugsweise vorwiegend in die Umfangsrichtung, d.h. das Lot auf die Seitenflächen und die Umlaufrichtung schließen einen Winkel von weniger als 45 Grad ein. Die geneigten Seitenflächen können zusammen ein Drittel der gesamten Oberfläche des Stegs bilden, z.B. kann die erste Seitenfläche wenigstens ein Sechstel der Oberfläche des Stegs und/oder die zweite Seitenfläche wenigstens ein Sechstel der Oberfläche des Stegs bilden.The first side surface and the second side surface are inclined towards one another and diverge with increasing distance from the longitudinal axis. The side surfaces preferably point predominantly in the circumferential direction, i.e. the perpendicular to the side surfaces and the circumferential direction enclose an angle of less than 45 degrees. The sloping side surfaces together may form one third of the total surface area of the web, for example the first side surface may form at least one sixth of the surface area of the web and/or the second side surface may form at least one sixth of the surface area of the web.

Bei dem wenigstens einen Steg kann eine Winkelabmessung in Umfangsrichtung um die Längsachse mit zunehmendem Abstand zu der Längsachse gleich bleiben oder zunehmen. Eine Ausführungsform sieht vor, dass der Arbeitsabschnitt wenigstens drei Stege aufweist.In the case of the at least one web, an angular dimension in the circumferential direction about the longitudinal axis can remain the same or increase as the distance from the longitudinal axis increases. One embodiment provides that the working section has at least three webs.

Erfindungsgemäß sind die Stege in identischen Winkelabständen um die Längsachse verteilt angeordnet.According to the invention, the webs are distributed at identical angular distances around the longitudinal axis.

Eine Ausführungsform sieht vor, dass eine Neigung der Stege gegenüber der Längsachse geringer als 10 Grad ist. Die Stege können um weniger als 90 Grad um die Längsachse umlaufen.One embodiment provides that the webs are inclined at an angle of less than 10 degrees relative to the longitudinal axis. The webs can rotate around the longitudinal axis by less than 90 degrees.

Eine Ausführungsform sieht vor, dass die Stege wellenförmig sind. Eine über die Längsachse gemittelte Neigung ist vorzugsweise geringer als 5 Grad.One embodiment provides that the webs are wavy. A slope averaged over the longitudinal axis is preferably less than 5 degrees.

Eine Ausführungsform sieht vor, dass zwischen zwei benachbarten Stegen eine Rille angeordnet ist. Die Rille hat eine sich in Richtung zu der Längsachse kontinuierlich verringernde Abmessung in Umfangsrichtung. Die gegenüberliegenden Seitenflächen der Stege sind zueinander geneigt, vorzugsweise mit einem Winkel von mehr als 10 Grad geneigt, vorzugsweise mehr als 20 Grad. Die die Stege können durch Walzen oder Einprägen der Rillen hergestellt werden.One embodiment provides that a groove is arranged between two adjacent webs. The groove has a continuously decreasing circumferential dimension towards the longitudinal axis. The opposite side faces of the webs are inclined towards one another, preferably at an angle of more than 10 degrees, preferably more than 20 degrees. The webs can be produced by rolling or embossing the grooves.

KURZE BESCHREIBUNG DER FIGURENBRIEF DESCRIPTION OF THE FIGURES

Die nachfolgende Beschreibung erläutert die Erfindung anhand von exemplarischen Ausführungsformen und Figuren. In den Figuren zeigen:

Fig. 1
einen Meißel
Fig. 2
einen Querschnitt in der Ebene II-II
Fig. 3
einen Querschnitt in der Ebene III-III
Fig. 4
einen Querschnitt in der Ebene IV-IV
Fig. 5
einen Querschnitt in der Ebene V-V
The following description explains the invention using exemplary embodiments and figures. In the figures show:
1
a chisel
2
a cross-section in the plane II-II
3
a cross section in the plane III-III
4
a cross-section in the plane IV-IV
figure 5
a cross-section in the plane VV

Gleiche oder funktionsgleiche Elemente werden durch gleiche Bezugszeichen in den Figuren indiziert, soweit nicht anders angegeben. Die Querschnitte sind vierfach größer als Fig. 1 dargestellt.Elements that are the same or have the same function are indicated by the same reference symbols in the figures, unless otherwise stated. The cross sections are four times larger than 1 shown.

AUSFÜHRUNGSFORMEN DER ERFINDUNGEMBODIMENTS OF THE INVENTION

Fig. 1 zeigt in einer Seitenansicht einen beispielhaften Meißel 1 zum Abtragen von Beton, Gestein oder anderen mineralischen Baumaterialien. Der Meißel 1 hat an einem Ende eine Spitze 2 und an einem der Spitze 2 abgewandten Ende eine Schlagfläche 3. Der Meißel 1 wird mit seiner Spitze 2 an einem Untergrund 4 angesetzt. Ein Schlagwerk einer Werkzeugmaschine schlägt in einer Schlagrichtung 5 auf die Schlagfläche 3 des Meißels 1. Hierdurch wird die Spitze 2 in der Schlagrichtung 5 in den Untergrund 4 eingetrieben. Ein an die Spitze 2 angrenzender Arbeitsabschnitt 6 spreizt den Untergrund 4 radial auf, bis der Untergrund 4 aufgrund der Spannungen bricht. 1 shows a side view of an exemplary chisel 1 for removing concrete, rock or other mineral building materials. The chisel 1 has a tip 2 at one end and a striking surface 3 at an end remote from the tip 2 . The chisel 1 is applied with its tip 2 to a substrate 4 . A hammer mechanism of a machine tool strikes the striking surface 3 of the chisel 1 in a striking direction 5 . As a result, the tip 2 is driven into the ground 4 in the striking direction 5 . A working section 6 adjoining the tip 2 spreads the base 4 radially until the base 4 breaks due to the stresses.

Der Meißel 1 ist insgesamt ein im Wesentlichen stabförmiger Körper. Der Meißel 1 hat eine Längsachse 7, welche durch die Spitze 2 und die Schlagfläche 3 verläuft. Die nachfolgenden Raumbeschreibungen axial, radial, radiale Richtung und Umfangsrichtung beziehen sich auf diese Längsachse 7. Die radiale Richtung hat ihren Ursprung in der Längsachse 7 und weist nach Außen. Typischerweise hat der Meißel 1 seine größte Abmessung längs der Längsachse 7; die Abmessungen senkrecht zu der Längsachse 7 sind deutlich geringer.Overall, the chisel 1 is essentially a rod-shaped body. The chisel 1 has a longitudinal axis 7 which runs through the tip 2 and the face 3 . The following spatial descriptions axial, radial, radial direction and circumferential direction relate to this longitudinal axis 7. The radial direction has its origin in the longitudinal axis 7 and points outwards. Typically, the bit 1 has its greatest dimension along the longitudinal axis 7; the dimensions perpendicular to the longitudinal axis 7 are significantly smaller.

Der Meißel 1 hat von der Schlagfläche 3 ausgehend längs der Längsachse 7 aufeinanderfolgend die Schlagfläche 3, einen Schaft 8, einen Arbeitsabschnitt 6 und die Spitze 2. Der Meißel 1 wird nachfolgend in mehrere Teile untergliedert beschrieben, welche bestimmte geometrische oder funktionelle Unterschiede aufweisen. Die Teile bilden jedoch vorzugsweise einen monolithischen Körper ohne Fügezonen, dies gilt insbesondere für den Grundkörper 9 bestehend aus dem Schaft 8 und dem Arbeitsabschnitt 6. Der Grundkörper 9 ist aus einem Stahl gefertigt und die Teile sind nicht gefügt, also weder verschweißt, gelötet, verschraubt, etc.. Die Spitze 2 kann monolithisch mit dem Grundkörper 9 gefertigt sein.The chisel 1 has, starting from the striking surface 3 along the longitudinal axis 7 , the striking surface 3, a shank 8, a working section 6 and the tip 2 in succession. The chisel 1 is described below divided into several parts which have certain geometric or functional differences. However, the parts preferably form a monolithic body without joining zones, this applies in particular to the base body 9 consisting of the shaft 8 and the working section 6. The base body 9 is made of steel and the parts are not joined, i.e. neither welded, soldered, screwed , etc.. The tip 2 can be manufactured monolithically with the base body 9 .

Der beispielhafte Meißel 1 ist ein sogenannter Spitzmeißel. Der Meißel 1 hat genau eine Spitze 2, welche auf der Längsachse 7 liegt. Die Spitze 2 hat weitgehend die Form eines Rotationskörpers; beispielsweise ist die Spitze 2 kegelförmig, kalottenförmig oder pyramidenförmig. Die zueinander orthogonalen Abmessungen der Spitze 2 in den Ebenen senkrecht zu der Längsachse 7 sind in etwa gleich groß. Vorzugsweise unterscheiden sich die zueinander orthogonalen Abmessungen um weniger als ein Drittel.The exemplary chisel 1 is a so-called pointed chisel. The chisel 1 has exactly one tip 2 which lies on the longitudinal axis 7 . The tip 2 is largely in the form of a solid of revolution; for example, the tip 2 is conical, dome-shaped or pyramid-shaped. The mutually orthogonal dimensions of the tip 2 in the planes perpendicular to the longitudinal axis 7 are approximately the same. Preferably, the mutually orthogonal dimensions differ by less than one-third.

Der Schaft 8 ist ein stabförmiger Körper. Eine Längsachse des Schafts 8 fällt mit der Längsachse 7 des Meißels 1 zusammen, d.h. der Schaft 8 ist koaxial zu der Längsachse 7. Der dargestellte Schaft 8 ist prismatisch mit einem hexagonalen Querschnitt. Der prismatische Schaft 8 kann unter anderem einen quadratischen, hexagonalen, oktogonalen, kreisförmigen oder elliptischen Querschnitt aufweisen.The shaft 8 is a rod-shaped body. A longitudinal axis of the shank 8 coincides with the longitudinal axis 7 of the bit 1 , ie the shank 8 is coaxial with the longitudinal axis 7. The illustrated shank 8 is prismatic with a hexagonal cross-section. The prismatic shaft 8 can have a square, hexagonal, octagonal, circular or elliptical cross-section, among others.

Die Schlagfläche 3 ist durch eine Stirnseite des Schafts 8 des Meißels 1 gebildet. Die Schlagfläche 3 ist im Wesentlichen senkrecht zu der Längsachse 7 orientiert. Die Schlagfläche 3 kann ballig oder eben ausgebildet sein.The striking surface 3 is formed by an end face of the shank 8 of the chisel 1 . The striking surface 3 is oriented essentially perpendicularly to the longitudinal axis 7 . The impact surface 3 can be convex or flat.

Ein Einsteckende 10 schließt sich unmittelbar an die Schlagfläche 3 an. Das Einsteckende 10 wird in einen Werkzeughalter der Werkzeugmaschine eingesetzt. Das Einsteckende 10 kann mit Strukturen versehen sein, welche zum Sichern des Meißels 1 in dem Werkzeughalter dienen. Beispielsweise weist das Einsteckende 10 ein oder mehrere Verriegelungsnuten 11 auf, welche längs der Längsachse 7 beidseitig geschlossen sind. Die Verriegelungsnuten 11 haben beispielsweise eine Länge von 1 cm bis 4 cm. Anstelle oder zusätzlich zu den Verriegelungsnuten 11 kann ein ringförmiger Kragen vorgesehen sein.A shank 10 directly adjoins the striking surface 3 . The shank 10 is inserted into a tool holder of the machine tool. The shank 10 can be provided with structures which serve to secure the chisel 1 in the tool holder. For example, the shank 10 has one or more locking grooves 11 which are closed on both sides along the longitudinal axis 7 . The locking grooves 11 have a length of 1 cm to 4 cm, for example. Instead of or in addition to the locking grooves 11 , an annular collar can be provided.

Der Arbeitsabschnitt 6 ist ein zusammenhängender, stabförmiger Körper. Eine Längsachse des Arbeitsabschnitts 6 fällt mit der Längsachse 7 des Meißels 1 zusammen, d.h. der Arbeitsabschnitt 6 ist koaxial zu der Längsachse 7. Der Arbeitsabschnitt 6 hat vorzugsweise seine größte Abmessung Länge 12 längs der Längsachse 7; die Abmessungen quer zu der Längsachse 7 sind deutlich geringer als die Länge 12, z.B. höchstens ein Drittel.The working section 6 is a coherent, rod-shaped body. A longitudinal axis of the working section 6 coincides with the longitudinal axis 7 of the chisel 1 , ie the working section 6 is coaxial with the longitudinal axis 7. The working section 6 preferably has its greatest dimension length 12 along the longitudinal axis 7; the dimensions transverse to the longitudinal axis 7 are significantly less than the length 12, eg at most one third.

Der Arbeitsabschnitt 6 hat einen zylindrischen Kern 13 und mehrere Stege 14. Die Stege 14 erstrecken sich über die gesamte Länge 12 des Arbeitsabschnitts 6. Die Stege 14 sind in Umfangsrichtung 15 um den Kern 13 verteilt angeordnet. Zwischen in Umfangsrichtung 15 benachbarten Stege 14 ist jeweils eine Rille 16. Die Anordnung der Stege 14 ergibt über die gesamte Länge 12 ein sternförmiges Querschnittsprofil, wie beispielhaft zu dem Meißel 1 von Fig. 1 in den Fig. 2 bis Fig. 5 dargestellt ist.The working section 6 has a cylindrical core 13 and a plurality of webs 14. The webs 14 extend over the entire length 12 of the working section 6. The webs 14 are distributed around the core 13 in the circumferential direction 15 . Between webs 14 that are adjacent in the circumferential direction 15 is a groove 16. The arrangement of the webs 14 results in a star-shaped cross-sectional profile over the entire length 12 , such as the chisel 1 of FIG 1 in the Figures 2 to 5 is shown.

Die Oberfläche des Arbeitsabschnitts 6 setzt sich aus der Oberfläche 17 der Stege 14 zusammen. Die beispielhafte dargestellte Oberfläche wird durch die vier Stege 14 und deren Oberflächen 17 gebildet. Die Stege 14 umschließen vollständig den auf der Längsachse 7 liegenden Kern 13. The surface of the working section 6 is composed of the surface 17 of the webs 14 . The surface shown as an example is formed by the four webs 14 and their surfaces 17 . The webs 14 completely enclose the core 13 lying on the longitudinal axis 7 .

Die Oberfläche 17 des Stegs 14 hat zwei voneinander abgewandte Seitenflächen 18, 19 und eine Rückenfläche 20. Die Seitenflächen 18, 19 und die Rückenflächen verlaufen längs der Längsachse 7; d.h. ihre größte Abmessung haben die Seitenflächen 18, 19 und die Rückenfläche 20 entlang der Längsachse 7. Eine erste der Seitenflächen 18 weist vorwiegend in die Umfangsrichtung 15; eine zweite der Seitenflächen 19 weist vorwiegend gegen die Umfangsrichtung 15. Die Rückenfläche 20 weist vorwiegend in die radiale Richtung. Ein Lot auf einen Punkt der Oberfläche 17 kann in üblicherweise in einen Vektoranteil in die radiale Richtung und einen Vektoranteil in die Umfangsrichtung 15 zerlegt werden. Vorwiegend bedeutet in diesem Zusammenhang, dass der Vektoranteil mit dem betragsmäßig größeren Beitrag vorgibt, in welche Richtung die Oberfläche 17 an dem Punkt weist. Die Oberfläche 17 kann Übergangsflächen 21 aufweisen, welche die Seitenflächen 18, 19 benachbarter Stege 14 miteinander verbinden. Die Übergangsflächen 21 bilden den Boden der Rillen 16. Die Übergangsflächen 21 können vorwiegend in die radiale Richtung weisen.The surface 17 of the web 14 has two side surfaces 18, 19 facing away from one another and a back surface 20. The side surfaces 18, 19 and the back surfaces run along the longitudinal axis 7; ie the side surfaces 18, 19 and the back surface 20 have their largest dimension along the longitudinal axis 7. A first of the side surfaces 18 points predominantly in the circumferential direction 15; a second of the side surfaces 19 points predominantly against the circumferential direction 15. The rear surface 20 points predominantly in the radial direction. A perpendicular to a point on the surface 17 can usually be broken down into a vector component in the radial direction and a vector component in the circumferential direction 15 . In this context, predominantly means that the vector component with the larger contribution in terms of absolute value specifies the direction in which the surface 17 points at the point. The surface 17 can have transition surfaces 21 which connect the side surfaces 18, 19 of adjacent webs 14 to one another. The transition surfaces 21 form the bottom of the grooves 16. The transition surfaces 21 can predominantly point in the radial direction.

Die Stege 14 haben einen längs der Längsachse 7 gleichbleibenden oder weitgehend gleichbleibenden Querschnitt. Der Querschnitt wird durch die Seitenflächen 18, 19 und die Rückenfläche 20 des Stegs 14 vorgegeben. Die gesamte Oberfläche des Arbeitsabschnitts 6 wird entsprechend allein durch die Stege 14 vorgegeben.The webs 14 have a cross-section that remains the same or largely remains the same along the longitudinal axis 7 . The cross section is defined by the side surfaces 18, 19 and the rear surface 20 of the web 14 . Accordingly, the entire surface of the working section 6 is defined solely by the webs 14 .

Der beispielhafte Steg 14 hat einen weitgehend trapezförmigen Querschnitt. Die Rückenfläche 20 bildet eine der Grundseiten; die Seitenflächen 19 bilden die Schenkel. Die Rückenfläche 20 kann konvex gewölbt sein. Die beispielhaften Seitenflächen 19 können eben sein. Eine imaginäre Fußfläche 22, welche der Rückenfläche 20 gegenüberliegt, bildet die andere der Grundseiten. Die Fußflächen 22 verbinden beispielsweise die tiefsten Punkte der Rillen 16. Die imaginären Fußflächen 22 der Stege 14 umschließen den Kern 13. The exemplary web 14 has a generally trapezoidal cross-section. The back panel 20 forms one of the bases; the side surfaces 19 form the legs. the Rear surface 20 can be convex. The exemplary side surfaces 19 can be flat. An imaginary foot surface 22, opposite the back surface 20 , forms the other of the bases. The bases 22 connect, for example, the deepest points of the grooves 16. The imaginary bases 22 of the webs 14 enclose the core 13.

Der Kern 13 ist vorzugsweise der größte, konvex prismatische Körper, welcher innerhalb der Oberfläche des Arbeitsabschnitts 6 angeordnet werden kann. Der Kern 13 berührt die Rillen 16 an deren der Längsachse 7 nächsten Punkten, d.h. an deren tiefsten Punkten. Bei symmetrischen Anordnungen der Stege 14 ist der Kern 13 ein Kreiszylinder, welcher alle Rillen 16 berührt. Ein Radius 23 des Kerns 13 ist gleich dem radialen Abstand der Rillen 16 zu der Längsachse 7. Der Kerndurchmesser ist das Doppelte des Radius 23. The core 13 is preferably the largest convex prismatic body that can be placed within the surface of the working portion 6 . The core 13 touches the grooves 16 at the points closest to the longitudinal axis 7 , ie at their deepest points. If the webs 14 are arranged symmetrically, the core 13 is a circular cylinder which touches all of the grooves 16 . A radius 23 of the core 13 is equal to the radial distance of the grooves 16 to the longitudinal axis 7. The core diameter is twice the radius 23.

Der Kern 13 hat einen geringen Anteil an der Masse des Arbeitsabschnitts 6. Der Kerndurchmesser ist vorzugsweise geringer als die Hälfte des Außendurchmessers 24 des Arbeitsabschnitts 6, z.B. geringer als 40% des Außendurchmessers 24. Die Querschnittsfläche des Kerns 13 hat einen Anteil von weniger als einem Drittel an der gesamten Querschnittsfläche, z.B. weniger als ein Viertel. Die Stege 14 tragen entsprechend zu wenigstens zwei Drittel des Querschnittsfläche und der Masse des Arbeitsabschnitts 6 bei.The core 13 accounts for a small proportion of the mass of the working section 6. The core diameter is preferably less than half the outer diameter 24 of the working section 6, eg less than 40% of the outer diameter 24. The cross-sectional area of the core 13 accounts for less than one One-third of the total cross-sectional area, eg, less than one-fourth. The webs 14 accordingly contribute to at least two-thirds of the cross-sectional area and the mass of the working section 6 .

Der Steg 14 hat eine Taille mit der geringsten Abmessung 25 in Umfangsrichtung 15. Die Taille ist vorzugsweise nahe dem Kern 13. Der Steg 14 wird ausgehend von der Taille mit zunehmendem Abstand 26 zu der Längsachse 7 breiter. Die Abmessung 27 in Umfangsrichtung 15 nimmt vorzugsweise kontinuierlich zu. Die Abmessung 27 in Umfangsrichtung 15 bezeichnet hierbei die Distanz, in einem Längenmaß, zwischen den voneinander abgewandten Seitenflächen 18, 19 in dem jeweiligen radialen Abstand 26 zu der Längsachse 7. Die breiteste Stelle (Schulter) mit der größten Abmessung 28 in Umfangsrichtung 15 grenzt an die Rückenfläche 20 an. Das Verhältnis der Schulter zu der Taille ist deutlich ausgeprägt. Die Schulter ist wenigstens um ein Drittel breiter wie die Taille, vorzugsweise um die Hälfte, z.B. um drei Viertel. Die Zunahme der Abmessung in Umfangsrichtung 15 erfolgt vorzugsweise über einen Großteil der Höhe 29 (radiale Abmessung) des Stegs 14, wenigstens über die Hälfte der Höhe 29. Die Abmessung 27 in Umfangsrichtung 15 kann von der Taille in Richtung zu dem Kern 13 zunehmen.The web 14 has a waist with the smallest dimension 25 in the circumferential direction 15. The waist is preferably close to the core 13. The web 14 widens with increasing distance 26 to the longitudinal axis 7 starting from the waist. The dimension 27 in the circumferential direction 15 preferably increases continuously. The dimension 27 in the circumferential direction 15 designates the distance, in a linear measure, between the side surfaces 18, 19 facing away from one another at the respective radial distance 26 from the longitudinal axis 7. The widest point (shoulder) with the greatest dimension 28 in the circumferential direction 15 is adjacent the back surface 20 on. The ratio of the shoulder to the waist is clearly pronounced. The shoulder is at least one third wider than the waist, preferably by half, eg three quarters. The increase in circumferential 15 dimension is preferably over a majority of the height 29 (radial dimension) of the web 14, at least half of the height 29. The circumferential 15 dimension 27 may increase from the waist toward the core 13 .

Die Seitenflächen 18, 19 sind zueinander geneigt und entfernen sich, von dem Kern 13 aus betrachtet, voneinander. Eine imaginäre Schnittlinie der geneigten Seitenflächen 18, 19 liegt auf der Seite der Fußfläche 22, vorzugsweise innerhalb des Kerns 13. Die beiden Seitenflächen 18, 19 der vier Stege 14 schließen einen Winkel 30 zwischen 33 Grad und 54 Grad ein. Bei einer Anzahl N von Stege 14 kann der Winkel 30 beispielsweise zwischen 75 % von 180/N Grad und 120 % von 180/N Grad gewählt sein.The side surfaces 18, 19 are inclined towards one another and, viewed from the core 13 , move away from one another. An imaginary intersection of the sloping side surfaces 18, 19 lies on the side of the root surface 22, preferably inside the core 13. The two Side surfaces 18, 19 of the four webs 14 enclose an angle 30 between 33 degrees and 54 degrees. With a number N of webs 14 , the angle 30 can be selected, for example, between 75% of 180/N degrees and 120% of 180/N degrees.

Die zueinander geneigten Seitenfläche 18, 19 haben einen dominanten Anteil an der Oberfläche 17 der Stege 14. Die beiden Seitenflächen 18, 19 bilden zusammen wenigstens die Hälfte der gesamten Oberfläche 17. Die Seitenflächen 18, 19 sind über einen wesentlichen Anteil der Höhe 29 des Stegs 14 zueinander in der zuvor beschriebenen Weise geneigt. Beispielsweise sind Seitenflächen 18, 19 für wenigstens die Hälfte, z.B. wenigstens drei Viertel der Höhe 29 des Stegs 14 derart zueinander geneigt. Der Abstand 31 der Taille zu der breitesten Stelle kann größer als die Hälfte der Höhe 29 sein, z.B. größer als drei Viertel der Höhe 29. The mutually inclined side surfaces 18, 19 have a dominant portion of the surface 17 of the webs 14. The two side surfaces 18, 19 together form at least half of the entire surface 17. The side surfaces 18, 19 are over a significant portion of the height 29 of the web 14 inclined to each other in the manner previously described. For example, side surfaces 18, 19 are inclined towards one another for at least half, for example at least three quarters of the height 29 of the web 14 . The distance 31 from the waist to the widest point may be greater than half the height 29 , e.g. greater than three quarters the height 29.

Der Steg 14 ist an der Rückenfläche 20 deutlich breiter als an der Fußfläche 22. Die geringste Breite liegt beispielsweise zwischen 20 % bis 75 % der größten Breite. Die Höhe 29 bezeichnet die größte Abmessung in radialer Richtung der Stege 14. Die Höhe 29 kann als die Differenz zwischen dem radialen Abstand der Rückenfläche 20 zu der Längsachse 7 und dem radialen Abstand der Rille 16 zu der Längsachse 7 bestimmt werden. Die Höhe 29 entspricht weitgehend der radialen Abmessung der Seitenflächen 18, 19. The web 14 is significantly wider on the back surface 20 than on the foot surface 22. The smallest width is, for example, between 20% and 75% of the largest width. The height 29 designates the largest dimension in the radial direction of the webs 14. The height 29 can be determined as the difference between the radial distance of the rear surface 20 from the longitudinal axis 7 and the radial distance of the groove 16 from the longitudinal axis 7 . The height 29 largely corresponds to the radial dimension of the side surfaces 18, 19.

Die Rillen 16 werden von dem Kern 13 zu ihrer Öffnung hin breiter. Eine Abmessung 32 in Umfangsrichtung 15 der Rillen 16 nimmt mit zunehmenden radialen Abstand 26 von der Längsachse 7 zu. Einander gegenüberliegende Seitenflächen 18, 19 zweier benachbarter Stege 14 sind entsprechend zueinander geneigt und entfernen sich, von dem Kern 13 aus betrachtet, voneinander. Die Neigung der gegenüberliegenden Seitenflächen 19 ist vorzugsweise größer als 10 Grad, z.B. größer als 20 Grad, und z.B. geringer als 45 Grad. Die Neigung begünstigt effiziente Walz- und Schmiedeverfahren.The grooves 16 widen from the core 13 towards their opening. A dimension 32 in the circumferential direction 15 of the grooves 16 increases with increasing radial distance 26 from the longitudinal axis 7 . Mutually opposite side surfaces 18, 19 of two adjacent webs 14 are correspondingly inclined towards one another and, viewed from the core 13 , move away from one another. The inclination of the opposite side faces 19 is preferably greater than 10 degrees, eg greater than 20 degrees and eg less than 45 degrees. The slope favors efficient rolling and forging processes.

Der beispielhafte Arbeitsabschnitt 6 hat eine vierzählige Drehsymmetrie um die Längsachse 7. Die vier Stege 14 sind identisch ausgebildet und jeweils um 90 Grad zu ihren jeweilig benachbarten Stege 14 in Umfangsrichtung 15 versetzt angeordnet. Wenngleich eine Anzahl von vier Stege 14 aus Gründen der Stabilität und der Fertigung bevorzugt sind, kann der Arbeitsabschnitt 6 wenigstens drei Stege und höchstens acht Stege aufweisen. Die Stege 14 sind vorzugsweise identisch ausgebildet, insbesondere bei einer ungeraden Anzahl. Bei einer geraden Anzahl, insbesondere bei vier, können die Stege 14 paarweise identisch ausgebildet sein. Die Stege 14 sind äquidistant in der Umfangsrichtung 15 verteilt angeordnet.The exemplary working section 6 has a four-fold rotational symmetry about the longitudinal axis 7. The four webs 14 are of identical design and are each offset by 90 degrees to their respective adjacent webs 14 in the circumferential direction 15 . Although a number of four ribs 14 is preferred for reasons of stability and manufacturing, the working portion 6 can have at least three ribs and at most eight ribs. The webs 14 are preferably of identical design, in particular if there is an odd number. If there are an even number, in particular if there are four, the webs 14 can be of identical design in pairs. The webs 14 are distributed equidistantly in the circumferential direction 15 .

Der Arbeitsabschnitt 6 kann in einem an die Spitze 2 angrenzenden Bereich 33 konisch zulaufen. Die Höhe 29 der Stege 14 nimmt in Schlagrichtung 5 kontinuierlich ab, z.B. bis auf Null angrenzend an die Spitze 2. Die Rillen 16 werden somit immer flacher. Der Radius 23 des Kerns 13 kann über die gesamte Länge 12 des Arbeitsabschnitts 6 gleich sein. Der Kern 13 liegt nahe der Spitze 2 frei. Eine Länge des konischen Bereiches 33 kann zwischen einem Drittel und der Hälfte der Länge 12 des Arbeitsabschnitts 6 liegen. Die Höhe 29 der Stege 14 ist in dem anderen verbleibenden Bereich 34 des Arbeitsabschnitts 6 konstant.The working section 6 can taper in a region 33 adjoining the tip 2 . The height 29 of the webs 14 decreases continuously in the direction of impact 5 , for example down to zero adjacent to the tip 2. The grooves 16 thus become ever flatter. The radius 23 of the core 13 can be the same over the entire length 12 of the working section 6 . The core 13 is exposed near the tip 2 . A length of the conical area 33 can be between one third and one half of the length 12 of the working section 6 . The height 29 of the webs 14 is constant in the other remaining area 34 of the working section 6 .

Die Stege 14 können parallel zu der Längsachse 7 sein. Die Stege 14 können auch um einen Neigungswinkel 35 gegenüber der Längsachse 7 geneigt sein. Die Neigung 35 kann beispielsweise anhand des höchsten Punkts 36 der Rückenfläche 20, der Seitenflächen 18, 19 oder einem Verlauf des Flächenschwerpunkts 37 in den Querschnitten längs der Längsachse 7 bestimmt werden. Die Neigung 35 des Stegs 14 gegenüber der Längsachse 7 ist vorzugsweise geringer als 10 Grad. Der Steg 14 läuft über die gesamte Länge 12 des Arbeitsabschnitts 6 um weniger als 90 Grad um die Längsachse 7 um.The webs 14 can be parallel to the longitudinal axis 7 . The webs 14 can also be inclined at an angle of inclination 35 with respect to the longitudinal axis 7 . The inclination 35 can be determined, for example, based on the highest point 36 of the back surface 20, the side surfaces 18, 19 or a course of the centroid 37 in the cross sections along the longitudinal axis 7 . The inclination 35 of the web 14 relative to the longitudinal axis 7 is preferably less than 10 degrees. The web 14 runs around the longitudinal axis 7 by less than 90 degrees over the entire length 12 of the working section 6 .

Die beispielhaft dargestellten Stege 14 sind wellenförmig. Der Steg 14 hat längs der Längsachse 7 mehrfach alternierend linksläufige Abschnitte 38 und rechtsläufige Abschnitte 39. Innerhalb eines linksläufigen Abschnitts 38 ist der Steg 14 in einem Uhrzeigersinn um die Längsachse 7 geneigt; innerhalb eines rechtsläufigen Abschnitt 39 ist der eine Steg 14 in einem Gegenuhrzeigersinn geneigt. Die Neigung 35 ist beispielsweise anhand des höchsten Punkts 36 bestimmt.The webs 14 shown as an example are wavy. Along the longitudinal axis 7 , the web 14 has multiple alternating left-hand sections 38 and right-hand sections 39. Within a left-hand section 38 , the web 14 is inclined in a clockwise direction about the longitudinal axis 7 ; within a clockwise section 39 , one web 14 is inclined in a counterclockwise direction. The slope 35 is determined, for example, using the highest point 36 .

Die Neigung 35 des Stegs 14 gegenüber der Längsachse 7 kann sich kontinuierlich ändern. Die betragsmäßig maximale Neigung 35 des Stegs 14 gegenüber der Längsachse 7 ist vorzugsweise geringer als 10 Grad. Die Stege 14 haben somit linke Wendepunkte, z.B. in Ebene III-III, und rechte Wendepunkte, z.B. in der Ebene IV-IV. Die linken Wendepunkte liegen vorzugsweise auf einer zu der Längsachse 7 parallelen Gerade; die rechten Wendepunkte liegen vorzugsweise auf einer zu der Längsachse 7 parallelen Gerade. Die Auslenkung in Umfangsrichtung 15 der linksläufigen Abschnitte 38 und rechtsläufigen Abschnitte 39 kompensiert sich vorzugsweise, d.h. die Auslenkungen sind betragsmäßig gleich. Der Steg 14 verläuft im Mittel parallel zu der Längsachse 7. Eine über die Länge 12 des Arbeitsabschnitts 6 gemittelte Neigung 35 ist vorzugsweise geringer als 5 Grad, z.B. geringer als 2 Grad, vorzugsweise gleich Null. Der Steg 14 ist in den linken Wendepunkten um weniger als ein Viertel seiner Breite gegenüber sich selbst in den rechten Wendepunkten in Umfangsrichtung 15 verschoben, z.B. um weniger als 15 %, vorzugsweise um mehr als 7 %. Ein wesentlicher Sektor der Rillen 16, z.B. mehr als 50 % der Querschnittsfläche der Rille 16, verläuft über die gesamte Länge 12 des Arbeitsabschnitts 6 parallel zu der Längsachse 7. The inclination 35 of the web 14 relative to the longitudinal axis 7 can change continuously. The absolute maximum inclination 35 of the web 14 relative to the longitudinal axis 7 is preferably less than 10 degrees. The webs 14 thus have turning points on the left, for example in plane III-III, and turning points on the right, for example in plane IV-IV. The turning points on the left preferably lie on a straight line parallel to the longitudinal axis 7 ; the turning points on the right preferably lie on a straight line parallel to the longitudinal axis 7 . The deflection in the circumferential direction 15 of the left-hand sections 38 and the right-hand sections 39 preferably compensates for one another, ie the deflections are of the same magnitude. The web 14 runs on average parallel to the longitudinal axis 7. An inclination 35 averaged over the length 12 of the working section 6 is preferably less than 5 degrees, for example less than 2 degrees, preferably equal to zero. The web 14 is shifted in the left-hand turning points by less than a quarter of its width relative to itself in the right-hand turning points in the circumferential direction 15 , for example by less than 15%, preferably by more than 7% A substantial sector of the grooves 16, e.g. more than 50% of the cross-sectional area of the groove 16, runs parallel to the longitudinal axis 7 over the entire length 12 of the working section 6 .

Claims (10)

  1. Chisel (1) which has a tip (2), a working portion (6) and an impact face (3) and a longitudinal axis (7) which runs through the tip (2), the working portion (6) and the impact face (3), wherein the working portion (6) has a plurality of webs (14) which run along the longitudinal axis (7) and which are arranged distributed in the circumferential direction (15) about the longitudinal axis (7) at identical angular spacings, wherein,
    in the case of at least one of the webs (14), a dimension (27) in the circumferential direction (15) about the longitudinal axis (7) increases with increasing distance (26) from the longitudinal axis (7), wherein the at least one web (14) has a first side face (18) pointing in a circumferential direction (15), a second side face (19) pointing counter to the circumferential direction (15), and a back face (20) pointing predominantly in the radial direction, wherein the first side face (13) and the second side face (19) diverge at an inclination to one another with increasing distance (26) from the longitudinal axis (7), characterized in that
    the dimension (27) in the circumferential direction increases by at least one third and has the largest dimension in the circumferential direction adjacent to the back face (20).
  2. Chisel (1) according to Claim 1, characterized in that, in the case of the at least one web (14), an angular dimension (30) in the circumferential direction (15) about the longitudinal axis (7) remains the same or increases with increasing distance (26) from the longitudinal axis (7).
  3. Chisel (1) according to Claim 2, characterized in that the first side face (18) forms at least one sixth of the surface of the web (14) and/or the second side face (19) forms at least one sixth of the surface of the web (14).
  4. Chisel (1) according to one of the preceding claims, characterized in that the working portion (6) has at least three webs (14).
  5. Chisel (1) according to one of the preceding claims, characterized in that an inclination (35) of the webs (14) with respect to the longitudinal axis (7) is less than 10 degrees.
  6. Chisel (1) according to one of the preceding claims, characterized in that the webs (14) run around the longitudinal axis (7) by less than 90 degrees.
  7. Chisel (1) according to one of the preceding claims, characterized in that the webs (14) are waved.
  8. Chisel (1) according to Claim 7, characterized in that an inclination (35) averaged over the longitudinal axis (7) is less than 5 degrees.
  9. Chisel (1) according to one of the preceding claims, characterized in that a groove (16) is arranged between two adjacent webs (14), wherein the groove (16) has a dimension (32) in the circumferential direction (15) that decreases continuously in the direction of the longitudinal axis (7).
  10. Chisel (1) according to Claim 1, characterized in that the side faces (19) of adjacent webs (14) are inclined by at least 10 degrees to one another so as to converge in the direction of the longitudinal axis (7).
EP17712130.8A 2016-03-23 2017-03-21 Chisel Active EP3433057B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP16161839.2A EP3222390A1 (en) 2016-03-23 2016-03-23 Chisel
PCT/EP2017/056617 WO2017162623A1 (en) 2016-03-23 2017-03-21 Tool bit

Publications (2)

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EP3433057A1 EP3433057A1 (en) 2019-01-30
EP3433057B1 true EP3433057B1 (en) 2022-03-02

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EP16161839.2A Withdrawn EP3222390A1 (en) 2016-03-23 2016-03-23 Chisel
EP17712130.8A Active EP3433057B1 (en) 2016-03-23 2017-03-21 Chisel

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EP16161839.2A Withdrawn EP3222390A1 (en) 2016-03-23 2016-03-23 Chisel

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US (1) US11213939B2 (en)
EP (2) EP3222390A1 (en)
CN (1) CN108883524B (en)
WO (1) WO2017162623A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD922841S1 (en) 2019-05-06 2021-06-22 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
USD923447S1 (en) 2019-05-06 2021-06-29 Milwaukee Electric Tool Corporation Chisel
USD922840S1 (en) 2019-05-06 2021-06-22 Milwaukee Electric Tool Corporation Chisel

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Also Published As

Publication number Publication date
EP3222390A1 (en) 2017-09-27
US20200122309A1 (en) 2020-04-23
WO2017162623A1 (en) 2017-09-28
US11213939B2 (en) 2022-01-04
EP3433057A1 (en) 2019-01-30
CN108883524B (en) 2022-08-26
CN108883524A (en) 2018-11-23

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