EP3278931A1 - Burin plat - Google Patents

Burin plat Download PDF

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Publication number
EP3278931A1
EP3278931A1 EP16182279.6A EP16182279A EP3278931A1 EP 3278931 A1 EP3278931 A1 EP 3278931A1 EP 16182279 A EP16182279 A EP 16182279A EP 3278931 A1 EP3278931 A1 EP 3278931A1
Authority
EP
European Patent Office
Prior art keywords
cutting edge
longitudinal axis
flat chisel
shaped
saddle
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Withdrawn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
EP16182279.6A
Other languages
German (de)
English (en)
Inventor
Peter Gerold
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 EP16182279.6A priority Critical patent/EP3278931A1/fr
Priority to US16/322,189 priority patent/US11673246B2/en
Priority to CN201780045194.9A priority patent/CN109562509A/zh
Priority to PCT/EP2017/069297 priority patent/WO2018024666A1/fr
Priority to EP17749169.3A priority patent/EP3493950B1/fr
Publication of EP3278931A1 publication Critical patent/EP3278931A1/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Withdrawn legal-status Critical Current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
    • B25D3/00—Hand chisels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/26—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by impact tools, e.g. by chisels or other tools having a cutting edge
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/36—Percussion drill 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
    • B25D2222/21—Metals
    • B25D2222/42—Steel
    • 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

Definitions

  • the present invention relates to a flat chisel for working mineral materials, in particular steel reinforced concrete.
  • a flat chisel is from the US 2900178 A known.
  • the flat chisel has a shank and a leaf-shaped working section.
  • a cutting edge of the working portion is formed in a convex-roof-shaped, that a tip lies on the longitudinal axis.
  • the design of the flat chisel favors a high mining performance, as an applied impact power is introduced centrally into the substrate along the longitudinal axis via the tip.
  • the flat chisel is less suitable for mining steel-reinforced concrete.
  • the flat chisel according to the invention has a longitudinal axis, a shank and a blade-shaped working section.
  • the shaft has a face normal to the longitudinal axis.
  • the working section has a cutting edge transverse to the longitudinal axis. The cutting edge is saddle-shaped.
  • the cutting edge can be placed on a steel reinforcement to separate them.
  • the saddle-shaped cutting edge prevents slippage of the cutting edge of the steel reinforcement.
  • the saddle-shaped shape retains its concave shape even with progressive wear of the cutting edge.
  • the saddle-shaped cutting edge preferably has a first concave curvature in a first plane spanned by the longitudinal axis and transverse axis and a second concave curvature in a second plane parallel to the longitudinal axis and perpendicular to the transverse axis.
  • the first concave curvature and the second concave curvature may coincide along the transverse axis.
  • An embodiment provides that the saddle-shaped cutting edge is arranged symmetrically to the longitudinal axis.
  • the first curvature and the second curvature may lie on the longitudinal axis.
  • An embodiment provides that the saddle-shaped cutting edge is arranged offset along the transverse axis to the longitudinal axis.
  • the first curvature and the second curvature may be arranged along the transverse axis offset from the longitudinal axis.
  • the cutting edge has a main cutting edge and a saddle-shaped secondary cutting edge, wherein the saddle-shaped secondary cutting edge is formed by a tooth offset from the main cutting edge along the longitudinal axis on the sheet-shaped working section.
  • the cutting edge has a main cutting edge and a saddle-shaped secondary cutting edge, wherein the saddle-shaped secondary cutting edge is formed by a recess offset in the sheet-shaped working section relative to the main cutting edge along the longitudinal axis.
  • Fig. 1 shows an exemplary flat chisel 1 .
  • the user can use the flat chisel 1 with a shank 2 in an electric chisel.
  • a cutting edge 3 of the flat chisel 1 is pressed against the ground.
  • the percussion of the electric chisel exerts blows on a striking surface 4 on the shaft 2 .
  • the shock wave of the stroke passes through the shaft 2 and a working portion 5 of the flat chisel 1 and drives the cutting edge 3 into the ground.
  • the shaft 2 of the exemplary flat chisel 1 is formed with a prismatic hexagonal cross section.
  • the shaft 2 may alternatively have a circular cross-section.
  • the striking surface 4 forms the exposed and remote from the cutting edge 3 end face of the shaft second
  • the striking surface 4 may be formed dome-shaped.
  • the exemplary shaft 2 has a groove 6 which is closed along the longitudinal axis 7 .
  • the shank 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 6 and secure the flat chisel 1 in the tool holder.
  • the exemplary shaft 2 has an annular collar 8 projecting radially beyond the shaft 2 .
  • Other tool holders lock the flat chisel 1 by means of a pivotable bracket, which engages behind the collar 8 on the side of the cutting edge 3 .
  • the shaft 2 may have both the groove 6 and the collar 8 or only one of the two locking means.
  • the working section 5 is sheet-shaped.
  • the working section 5 lies in a plane E , which contains the longitudinal axis 7 .
  • the axis perpendicular to the longitudinal axis 7 in the plane E is hereinafter referred to as the transverse axis 9 .
  • the dimensions of the working section in the plane E are significantly greater than the dimension along vertical plane 10 perpendicular to the plane E (thickness).
  • the width is preferably between two and four times the thickness.
  • the exemplary working section 5 has two longitudinal edges 11 , which run parallel to the longitudinal axis 7 .
  • the distance between the two longitudinal edges 11 defines the width of the working section.
  • the cutting edge 3 connects the two longitudinal edges. 11
  • the cutting edge 3 lies on the longitudinal axis 7 and faces away from the striking surface 4 .
  • the cutting edge 3 preferably runs in the plane E.
  • the cutting edge 3 extends along the transverse axis 9 , that is oriented transversely to the longitudinal axis 7 .
  • the cutting edge 3 is saddle-shaped.
  • the cutting edge 3 has along the transverse direction 12 a concave curvature in the longitudinal axis 7 and a concave curvature in the vertical axis 10 .
  • the concave curvature in the longitudinal axis 7 causes the two longitudinal edges 11 protrude in the impact direction 13 through the center of the cutting edge 3 in the direction of impact. 13
  • the concave curvature in the vertical axis 10 causes the flat chisel 1 to be thinner in the middle than at the longitudinal edges 11 .
  • a (horizontal) inclination 14 of the cutting edge 3 with respect to the transverse axis 9 increases continuously from the longitudinal axis 7 towards the longitudinal edges 11 (FIG. Fig. 2 ).
  • the maximum slope 14 is in the range between 10 degrees and 30 degrees.
  • the associated (horizontal) radii of curvature along the curved area are moderate, eg greater than 10 cm.
  • the cutting edge 3 has no cracks or sharp indentations in the concave area.
  • the cutting edge 3 can be concavely curved over its entire width.
  • an area around the longitudinal axis 7 is concavely curved, the edge areas of the cutting edge run parallel to the transverse axis 9 .
  • One or both of the opposite leaf surfaces 15 of the working portion 5 are concave ( Fig. 3 ).
  • a distance of the blade surface 15 to the plane E is minimal near the longitudinal axis 7 and increases along the transverse axis 9 .
  • the thickness of the working section 5 increases starting from the longitudinal axis 7 along the transverse axis 9 .
  • the thickness preferably decreases continuously in the region around the longitudinal axis 7 .
  • a (vertical) maximum inclination 16 of the leaf surface 15 with respect to the transverse axis 9 is in the range between 10 degrees and 30 degrees.
  • the associated (vertical) radius of curvature on the longitudinal axis 7 is in the range between 0.5 cm and 2 cm.
  • the longitudinal edges 11 may be formed by extending along the longitudinal axis 7 struts 17 .
  • the working section 5 has between the struts 17 a parallel to the longitudinal axis 7 extending groove 18th
  • the thickness of the groove 18 is less than the thickness of the struts 17th
  • the leaf surface 15 is correspondingly arched concavely between the struts 17 .
  • the transition from the struts 17 to the channel 18 is preferably smooth, ie without jumps.
  • the struts 17 can extend to the cutting edge 3 ; the channel 18 can extend up to the cutting edge 3 .
  • Fig. 4 shows a flat chisel 19 .
  • the flat chisel 1 has a shaft 2 as the flat chisel 1 described above , for a description, reference is made accordingly.
  • the flat chisel 19 has a leaf-shaped working section 5 .
  • the working section 5 forms a concave cutting edge 3.
  • the cutting edge 3 is formed saddle-shaped.
  • the working section 5 has exactly two along the longitudinal axis 7 extending struts 17th Between the two struts 17 is parallel to the longitudinal axis 7 a groove 18th The leaf surface 15 between the two struts 17 is continuously concave along the transverse direction 12 .
  • a distance of the struts 17 to the longitudinal edge 11 is approximately equal to the distance of the struts 17 to the longitudinal axis 7 or center of the working section. 5
  • the ratio of the distances is for example in the range between 5: 6 to 6: 5.
  • FIG. 5 Another flat chisel 20 ( Fig. 5 ) is in a longitudinal section in the horizontal plane ( Fig. 6 ) and a cross-section at level VII-VII ( Fig. 7 ).
  • the flat chisel 20 has a shank 2 which is the same or analogous to the flat chisel 1 .
  • the flat chisel 20 further has a blade-shaped working section 21 .
  • the working portion 5 has two along the longitudinal axis 7 extending longitudinal edges. 11 Between the two longitudinal edges 11 , the opposite leaf surfaces 15 are clamped.
  • the thickness of the working portion 21 is significantly less than the width and length of the working portion 5, analogous to the working portion 21 of the flat chisel 1.
  • the leaf surfaces 15 may be flat or curved.
  • the flat chisel 20 has a two-part cutting edge 22 of a main cutting edge 23 and a secondary cutting edge 24 .
  • the main cutting edge 23 extends along the transverse axis 9 .
  • the main cutting edge 23 is arranged symmetrically to the longitudinal axis 7 .
  • the main cutting edge 23 is rectilinear and perpendicular to the longitudinal axis 7 .
  • the main cutting edge 23 may be concavely curved analogously to the cutting edge 3 .
  • the secondary cutting edge 24 is arranged offset along the longitudinal axis 7 to the main cutting edge 23 .
  • the exemplary secondary cutting edge 24 is formed by a tooth 25 protruding from the longitudinal edge 11 in the transverse axis 9 .
  • the secondary cutting edge 24 is inclined relative to the transverse axis 9 by an angle of inclination 26 .
  • the inclination 14 may be equal to the maximum inclination 14 in the first embodiment.
  • the secondary cutting edge 24 is inclined in the direction of the longitudinal edge 11 counter to the direction of impact 13 .
  • the exemplary secondary cutting edge 24 is concavely curved. Alternatively, the secondary cutting edge 24 may be rectilinear.
  • the longitudinal edge 11 and the secondary cutting edge 24 form a concave area, in which a reinforcing iron can be hung.
  • the tooth 25 is too the longitudinal edge 11 tapers.
  • the side surfaces 27 of the tooth 25 are inclined by an inclination angle 28 with respect to the horizontal plane E.
  • FIG. 8 Another flat chisel 29 ( Fig. 8 ) is in a longitudinal section ( Fig. 9 ) and a cross section in the plane VIII-VIII ( Fig. 10 ).
  • the flat chisel 29 has a shank 2 and a working portion 21 which are the same or analogous to the flat chisel 20 .
  • the chisel 29 has a two-part cutting edge 30 of a main cutting edge 31 and a minor cutting edge 3 2.
  • the main cutting edge 31 extends along the transverse axis 9.
  • the main cutting edge 31 is arranged symmetrically to the longitudinal axis. 7
  • the main cutting edge 31 is rectilinear and perpendicular to the longitudinal axis 7 .
  • the main cutting edge 31 may be concavely curved analogously to the cutting edge 3 .
  • the secondary cutting edge 32 is arranged offset along the longitudinal axis 7 to the main cutting edge 31 .
  • the exemplary secondary cutting edge 32 is formed by a recess 33 in the longitudinal edge 11 .
  • the recess 33 corresponds in its (hollow) dimensions about the cross section of a typical reinforcing iron.
  • the recess 33 may be formed in particular circular segment-shaped.
  • the radius of curvature is of the order of the radius of typical reinforcing iron.
  • the secondary cutting edge 32 is formed by the edge 13 of the recess 33 which points in the direction of impact 13 .
  • the secondary cutting edge 32 is concave, for example circular, arched.
  • the opposite of the direction of impact 13 furthest recessed point of the cutting edge 3 is within the recess 33, that is offset along the transverse axis 9 with respect to the longitudinal edge 11 .
  • the cutting edge 3 rises from the point to the longitudinal edge 11 in the direction of impact 13 .
  • the secondary cutting edge 32 is inclined starting at the longitudinal edge 11 counter to the direction of impact 13 by the angle of inclination 26 .
  • the thickness of the minor cutting edge 32 changes along the secondary cutting edge 32 .
  • the thickness is lowest at the furthest recessed point.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
EP16182279.6A 2016-08-02 2016-08-02 Burin plat Withdrawn EP3278931A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP16182279.6A EP3278931A1 (fr) 2016-08-02 2016-08-02 Burin plat
US16/322,189 US11673246B2 (en) 2016-08-02 2017-07-31 Flat chisel
CN201780045194.9A CN109562509A (zh) 2016-08-02 2017-07-31 扁平凿
PCT/EP2017/069297 WO2018024666A1 (fr) 2016-08-02 2017-07-31 Burin plat
EP17749169.3A EP3493950B1 (fr) 2016-08-02 2017-07-31 Burin plat

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16182279.6A EP3278931A1 (fr) 2016-08-02 2016-08-02 Burin plat

Publications (1)

Publication Number Publication Date
EP3278931A1 true EP3278931A1 (fr) 2018-02-07

Family

ID=56567463

Family Applications (2)

Application Number Title Priority Date Filing Date
EP16182279.6A Withdrawn EP3278931A1 (fr) 2016-08-02 2016-08-02 Burin plat
EP17749169.3A Active EP3493950B1 (fr) 2016-08-02 2017-07-31 Burin plat

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP17749169.3A Active EP3493950B1 (fr) 2016-08-02 2017-07-31 Burin plat

Country Status (4)

Country Link
US (1) US11673246B2 (fr)
EP (2) EP3278931A1 (fr)
CN (1) CN109562509A (fr)
WO (1) WO2018024666A1 (fr)

Families Citing this family (7)

* 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
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
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
EP3978195A1 (fr) * 2020-09-30 2022-04-06 Hilti Aktiengesellschaft Burin et porte outil
USD1003133S1 (en) * 2021-11-04 2023-10-31 Joseph Lee Drywall spike

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE118286C (fr) *
FR1036343A (fr) * 1951-04-30 1953-09-07 Burin à découper
FR1152841A (fr) * 1956-06-28 1958-02-26 Perfectionnements aux outils travaillant au choc, tels que les burins et analogues
US2900178A (en) 1958-03-10 1959-08-18 Ingersoll Rand Co Paving breaker steel
EP0025418A1 (fr) * 1979-09-10 1981-03-18 Schweizerische Aluminium AG Ciseau pour une machine de piquage et procédé pour son fonctionnement
EP1340595A2 (fr) * 2002-02-28 2003-09-03 Hawera Probst GmbH Burin plat

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1098795A (en) * 1911-01-21 1914-06-02 Fred A Gill Drill.
US1471062A (en) * 1923-03-24 1923-10-16 Victor T Riblett Flue tool
US2109390A (en) * 1935-06-13 1938-02-22 Eidco Inc Drill bit
US3191909A (en) * 1963-03-29 1965-06-29 Norbert M Reischl Spot weld separator
CA1049767A (fr) * 1976-02-17 1979-03-06 Harry A. Kerins Coupe ecrou
CN2050069U (zh) * 1986-12-08 1989-12-27 冶金工业部五龙金矿 Yzyh型钎头
DE20010451U1 (de) * 2000-06-10 2001-10-18 Rinderer Nikolaus Meißel
DE10100405C2 (de) * 2001-01-05 2002-11-21 Joh Hermann Picard Gmbh & Co Handwerkzeug zur Bearbeitung von Steinen sowie gesteinsähnlichen Materialien
CN2645859Y (zh) * 2003-10-29 2004-10-06 黄武槐 电锤套件
EP1616670B1 (fr) 2004-07-13 2009-10-21 BLACK & DECKER INC. Ciseau

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE118286C (fr) *
FR1036343A (fr) * 1951-04-30 1953-09-07 Burin à découper
FR1152841A (fr) * 1956-06-28 1958-02-26 Perfectionnements aux outils travaillant au choc, tels que les burins et analogues
US2900178A (en) 1958-03-10 1959-08-18 Ingersoll Rand Co Paving breaker steel
EP0025418A1 (fr) * 1979-09-10 1981-03-18 Schweizerische Aluminium AG Ciseau pour une machine de piquage et procédé pour son fonctionnement
EP1340595A2 (fr) * 2002-02-28 2003-09-03 Hawera Probst GmbH Burin plat

Also Published As

Publication number Publication date
EP3493950B1 (fr) 2021-03-10
WO2018024666A1 (fr) 2018-02-08
EP3493950A1 (fr) 2019-06-12
US11673246B2 (en) 2023-06-13
CN109562509A (zh) 2019-04-02
US20190184539A1 (en) 2019-06-20

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