EP3281748A1 - Burin - Google Patents

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Publication number
EP3281748A1
EP3281748A1 EP16183147.4A EP16183147A EP3281748A1 EP 3281748 A1 EP3281748 A1 EP 3281748A1 EP 16183147 A EP16183147 A EP 16183147A EP 3281748 A1 EP3281748 A1 EP 3281748A1
Authority
EP
European Patent Office
Prior art keywords
wings
longitudinal axis
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.)
Withdrawn
Application number
EP16183147.4A
Other languages
German (de)
English (en)
Inventor
Steffen Geiger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hilti AG
Original Assignee
Hilti AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Priority to EP16183147.4A priority Critical patent/EP3281748A1/fr
Priority to PCT/EP2017/069300 priority patent/WO2018029022A1/fr
Priority to CN201780044253.0A priority patent/CN109496177A/zh
Priority to EP17754628.0A priority patent/EP3496902B1/fr
Priority to US16/266,964 priority patent/US20200122310A1/en
Publication of EP3281748A1 publication Critical patent/EP3281748A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/02—Percussive tool bits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • 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 of rock or mineral building materials such as concrete and brick.
  • An exemplary chisel for the processing of mineral building materials is from the US 2012/0301238 known.
  • the chisel has a shank and a working area which tapers into a point.
  • the work area has four longitudinal ribs, which spread evenly when penetrating the bit in the building material.
  • the bit according to the invention has a shank, a striking surface, a tip, a longitudinal axis extending through the striking surface and the tip, and a working portion.
  • the working section has a fuselage arranged on the longitudinal axis and two wings extending along the fuselage and projecting radially relative to the fuselage.
  • the two wings are arranged V-shaped.
  • the chisel spreads the rock with the trunk and the wings.
  • the V-shaped arrangement of the wings reduces jamming in the ground compared to a rotationally symmetrical pointed chisel. Due to its non-rotationally symmetrical shape, the bit also generates non-radial forces acting along a vertical axis through the wings in addition to radially acting forces for blasting the rock.
  • a dihedral angle between the wings may be 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 connecting lines of the tips of the wings with the longitudinal axis in planes perpendicular to the longitudinal axis.
  • One embodiment provides that in one area the wings have a varying cross section along the longitudinal axis, wherein each of the cross sections in this area only partially overlaps with the other cross sections. If one compares any first cross section with any second cross section, the first one has Cross-section over the second cross-section protruding surfaces and also has the second cross-section over the first cross-section protruding surfaces.
  • An embodiment provides that the dihedral angle increases from the shaft to the tip.
  • the wings are set closer to each other near the shaft than in the area of the tip.
  • the wings may lie at the apex in a plane with the longitudinal axis, i. have a dihedral angle of 180 degrees.
  • the working section has no twofold rotational symmetry about the longitudinal axis.
  • the wings can be arranged mirror-symmetrically to a symmetry plane containing the longitudinal axis.
  • An embodiment provides that the two wings are arranged mainly above a horizontal plane containing the longitudinal axis.
  • the center of gravity or the wing tip lies continuously on one side of the horizontal plane H.
  • An embodiment provides that the wings are inclined along the longitudinal axis by an angle of attack relative to the longitudinal axis.
  • the two wings are only with their pointing in the same direction top of the hole wall, the bottom is not or only partially.
  • the unequal support reduces the risk of chiselling.
  • the bit experiences a net force offset to the longitudinal axis and parallel to a vertical axis.
  • An embodiment provides that a radial dimension of the two wings decreases from the shaft to the tip.
  • An embodiment provides that the hull is formed substantially rotationally. An embodiment provides that the hull is arranged coaxially to the longitudinal axis.
  • Fig. 1 shows an exemplary pointed chisel 1.
  • the user can use the chisel 1 with a shank 2 in an electric chisel.
  • a tip 3 of the pointed chisel 1 is pressed against the ground.
  • the percussion of the electric chisel exerts blows in a direction of impact 4 on a striking surface 5 on the shaft 2 .
  • the shock wave of the stroke passes through the shaft 2 and a working portion 6 of the chisel 1 and drives the tip 3 into the ground.
  • the pointed chisel 1 has an elongated body.
  • the narrow ends of the chisel 1 are the striking surface 5 and the tip 3.
  • a longitudinal axis 7 of the chisel 1 extends through the striking surface 5 and the tip 3.
  • the elongate body is divided along the longitudinal axis 7 into two sections: the shank 2 and the working section 6.
  • the shaft 2 starts at the impact surface 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 shaft 2 and the working section 6 differ in their function and an associated geometric shape.
  • the shaft 2 serves primarily to hold the pointed chisel 1 in a hand tool.
  • the geometric shape is very simple and substantially uniform along the longitudinal axis, for example cylindrical or prismatic with a square or hexagonal cross-section.
  • the striking surface 5 forms the exposed and remote from the top 3 end face of the shaft 2.
  • the striking surface 5 may be formed dome-shaped.
  • the exemplary shaft 2 has a groove 9, which is closed along the longitudinal axis 7 .
  • the shank 2 can be inserted into a tool holder of the electric chisel.
  • the exemplary shaft 2 has an annular collar 10 projecting radially beyond the shaft 2 .
  • Other tool holders lock the chisel 1 by means of a pivotable bracket, which engages behind the collar 10 on the side of the tip 3 .
  • the shaft 2 may 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 in this.
  • the working section 6 is designed for an efficient breaking up of a subfloor and with regard to a reduced tendency for jamming in the subsoil.
  • the geometric shape of the working portion 6 is correspondingly significantly different from the basic shape of the shaft 2.
  • the working portion 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.
  • the coordinate system is oriented on a rectangle circumscribing the working section 6 with a longitudinal axis 7, a transverse axis 13 and a vertical axis 14.
  • the three axes are mutually orthogonal and intersect at a point.
  • the longitudinal axis 7 is defined by the connecting line from the top 3 to the center of the striking surface 5 .
  • Axial and radial 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.
  • the transverse axis 13 is parallel to a connecting line of the opposite wing tips 17.
  • the length 25 of the working portion 6 is preferably significantly greater than the width 15 of the working portion 6, for example at least five times as large.
  • the width 15 of the working portion 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 as a 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 region 18 with a longitudinal width 7 of constant width 15 (FIG. FIG. 6 to FIG. 10 ) and a tip region 19 with a width 15 (FIG. 1) which decreases along the longitudinal axis 7 towards the tip 3 (FIG. Fig. 4 to Fig. 6 ).
  • the hull 11 is a substantially rod-shaped body with a circular cross-section, which tapers conically in the region of the tip 3 .
  • the tip of the fuselage 11 forms the tip 3 of the pointed chisel 1.
  • the cross section of the hull 11 may also be elliptical with an aspect ratio of at most 1: 1.2.
  • the hull 11 defines the longitudinal axis 7 of the bit 1.
  • the hull 11 and the longitudinal axis 7 are coaxial.
  • the exemplary wings 12 are substantially plate-shaped bodies each having a top 20, a bottom 21 and a wing tip 17.
  • the wing tip 17 denotes the outer radial edge of the wings 12th
  • a thickness 22, ie the local distance of the top 20 to the bottom 21, the wing 12 is significantly less than the height 16 of the fuselage 11 and the working portion 6.
  • the thickness 22 may be substantially constant in the radial direction.
  • the top 20 and bottom 21 may be referred to as being approximately parallel.
  • the top 20 and the bottom 21 may be planar or have an approximately equal curvature along the radial direction.
  • the wings 12 directly adjoin the hull 11 .
  • the wings 12 divide the exposed surface of the hull 11 in a back 23 and a belly 24.
  • the back 23 is above a horizontal plane H
  • the belly 24 is below the horizontal plane H.
  • the horizontal plane H is perpendicular to the vertical axis 14 and is of the Longitudinal axis 7 and the transverse axis 13 spanned.
  • the wings 12 are extended over the entire length 25 or a majority of the working portion 6 .
  • the axial dimension of the wings 12 is significantly greater than their radial dimension, eg, 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 equal, eg, 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 manner as the radius of the cone-shaped trunk 11 .
  • a ratio of the dimensions can be constant.
  • a center of gravity of the wings 12 lies above the horizontal plane H.
  • the wings 12 are arranged mainly above the horizontal plane H , ie a portion of the wing 12 above the horizontal plane H is greater than the portion of the wing 12 below the horizontal plane H.
  • a line through the centroids of the wings 12 in the successive cross sections may be in sections, in particular near the top 3, lie on the horizontal plane H and is otherwise above the horizontal plane H.
  • the wing tips 17 are from the shaft 2 to the tip 3 and, however, above the horizontal plane H is not 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 about the longitudinal axis 7 .
  • the working section 6 has due to the V-shaped wings arranged 12 no rotational symmetry.
  • the working portion 6 has no twofold rotational symmetry about the longitudinal axis 7, which would bring a rotation of the working portion 6 by 180 degrees with itself to cover.
  • the working section 6 also has due to the V-shaped wings arranged 12 no mirror symmetry with respect to the horizontal plane H.
  • the relative V-shaped adjustment of the two wings 12 to one another may increase 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 may lie in a plane, eg the horizontal plane H.
  • the dihedral angle 27 is, for example, between 170 degrees and 180 degrees, preferably 180 degrees. In the guide region 18 , the dihedral angle 27 decreases continuously. Adjacent to the shaft 2 , the dihedral angle 27 is minimal and is 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 of attack 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 attack 29 .
  • a vertical distance 30, ie along the vertical axis 14, of the wing tips 17 to the horizontal plane H preferably continuously increases from that of the tip 3 to the shaft 2 , in particular within the guide region.
  • the working portion 6 is located in the ground with the tops 20 of the wings 12 and the belly 24 of the fuselage 11 at the hole wall.
  • the undersides 21 of the wings 12 are of the hole wall spaced. As far as the lower sides 21 rest against the hole wall, they exert a lower force compared to the upper sides 20 on the hole wall.
  • the back 23 may be provided in a region adjacent to the shaft 2 with a trough 31 .
  • the trough 31 is preferably symmetrical to the vertical plane V.
  • the trough 31 forms a concave surface on the spine 23 .
  • the radial distance of the surface of the well 31 to the longitudinal axis 7 is located in the region 18 between 66% and 85% of the radius of the fuselage. 11
  • the tummy 24 may be provided with a trough 32 in an area adjacent to the shaft 2 .
  • the trough 32 is preferably symmetrical about the vertical plane V.
  • the trough 32 forms a concave surface on the tummy 24 .
  • the radial distance of the surface of the well 32 to the longitudinal axis 7 is located in the region 18 between 66% and 85% of the radius of the fuselage. 11

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Earth Drilling (AREA)
EP16183147.4A 2016-08-08 2016-08-08 Burin Withdrawn EP3281748A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP16183147.4A EP3281748A1 (fr) 2016-08-08 2016-08-08 Burin
PCT/EP2017/069300 WO2018029022A1 (fr) 2016-08-08 2017-07-31 Burin
CN201780044253.0A CN109496177A (zh) 2016-08-08 2017-07-31 凿具
EP17754628.0A EP3496902B1 (fr) 2016-08-08 2017-07-31 Burin
US16/266,964 US20200122310A1 (en) 2016-08-08 2017-07-31 Chisel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16183147.4A EP3281748A1 (fr) 2016-08-08 2016-08-08 Burin

Publications (1)

Publication Number Publication Date
EP3281748A1 true EP3281748A1 (fr) 2018-02-14

Family

ID=56615881

Family Applications (2)

Application Number Title Priority Date Filing Date
EP16183147.4A Withdrawn EP3281748A1 (fr) 2016-08-08 2016-08-08 Burin
EP17754628.0A Active EP3496902B1 (fr) 2016-08-08 2017-07-31 Burin

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP17754628.0A Active EP3496902B1 (fr) 2016-08-08 2017-07-31 Burin

Country Status (4)

Country Link
US (1) US20200122310A1 (fr)
EP (2) EP3281748A1 (fr)
CN (1) CN109496177A (fr)
WO (1) WO2018029022A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU221725U1 (ru) * 2023-04-27 2023-11-21 федеральное государственное бюджетное образовательное учреждение высшего образования "Санкт-Петербургский горный университет" Боек машин ударного действия

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD921465S1 (en) 2019-05-06 2021-06-08 Milwaukee Electric Tool Corporation Mortar knife
USD922840S1 (en) 2019-05-06 2021-06-22 Milwaukee Electric Tool Corporation Chisel
USD922841S1 (en) 2019-05-06 2021-06-22 Milwaukee Electric Tool Corporation Chisel
USD922842S1 (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
EP3978195A1 (fr) * 2020-09-30 2022-04-06 Hilti Aktiengesellschaft Burin et porte outil
USD1046579S1 (en) 2023-01-06 2024-10-15 Milwaukee Electric Tool Corporation Chisel
USD1045551S1 (en) 2023-01-06 2024-10-08 Milwaukee Electric Tool Corporation Chisel

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB512830A (en) * 1938-03-17 1939-09-27 John Joseph Rawlings Improvements in percussion drills
DE733686C (de) * 1940-04-04 1943-04-01 Ernst Doering Fa Durchgehaerteter Profilmeissel
FR905582A (fr) * 1943-06-04 1945-12-07 Flottmann Ag Marteau à bêche pour l'extraction de l'argile et autres roches
EP0519493A1 (fr) * 1991-06-20 1992-12-23 SOLIDA-WERK WERKZEUGTECHNIK GmbH + Co. KG Ciseau pour la réalisation des rainures en bâtiments
WO2001036163A1 (fr) * 1999-11-17 2001-05-25 Hawera Probst Gmbh Trepan
US20120301238A1 (en) 2011-03-22 2012-11-29 Black & Decker Inc. Chisels
US20130205603A1 (en) * 2012-02-15 2013-08-15 Hilti Aktiengesellschaft Chisel

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2607244Y (zh) * 2003-03-16 2004-03-24 俞忠旭 便利凿子
DE10318091A1 (de) * 2003-04-17 2004-11-18 Robert Bosch Gmbh Flachmeißel
EP1616670B1 (fr) * 2004-07-13 2009-10-21 BLACK & DECKER INC. Ciseau
CN200939594Y (zh) * 2006-08-22 2007-08-29 朱清明 电锤用冲击凿

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB512830A (en) * 1938-03-17 1939-09-27 John Joseph Rawlings Improvements in percussion drills
DE733686C (de) * 1940-04-04 1943-04-01 Ernst Doering Fa Durchgehaerteter Profilmeissel
FR905582A (fr) * 1943-06-04 1945-12-07 Flottmann Ag Marteau à bêche pour l'extraction de l'argile et autres roches
EP0519493A1 (fr) * 1991-06-20 1992-12-23 SOLIDA-WERK WERKZEUGTECHNIK GmbH + Co. KG Ciseau pour la réalisation des rainures en bâtiments
WO2001036163A1 (fr) * 1999-11-17 2001-05-25 Hawera Probst Gmbh Trepan
US20120301238A1 (en) 2011-03-22 2012-11-29 Black & Decker Inc. Chisels
US20130205603A1 (en) * 2012-02-15 2013-08-15 Hilti Aktiengesellschaft Chisel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU221725U1 (ru) * 2023-04-27 2023-11-21 федеральное государственное бюджетное образовательное учреждение высшего образования "Санкт-Петербургский горный университет" Боек машин ударного действия

Also Published As

Publication number Publication date
EP3496902A1 (fr) 2019-06-19
CN109496177A (zh) 2019-03-19
US20200122310A1 (en) 2020-04-23
EP3496902B1 (fr) 2020-04-01
WO2018029022A1 (fr) 2018-02-15

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