EP3493950A1 - Flachmeissel - Google Patents
FlachmeisselInfo
- Publication number
- EP3493950A1 EP3493950A1 EP17749169.3A EP17749169A EP3493950A1 EP 3493950 A1 EP3493950 A1 EP 3493950A1 EP 17749169 A EP17749169 A EP 17749169A EP 3493950 A1 EP3493950 A1 EP 3493950A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cutting edge
- longitudinal axis
- flat chisel
- shaped
- along
- 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.)
- Granted
Links
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 known from US 2900178 A.
- 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.
- 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 with respect to the main cutting edge along the longitudinal axis on the blade-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 a flat chisel
- Fig. 2 is a longitudinal section through the blade of the flat chisel in the plane E
- Fig. 3 shows a cross section through the sheet in the plane III-III
- Fig. 4 is a flat chisel
- Fig. 5 is a flat chisel
- Fig. 6 is a longitudinal section through flat chisel of Fig. 5 in the plane Vl-Vl
- Fig. 7 shows a cross section through the flat chisel of Fig. 5 in the plane VII-VII
- Fig. 8 is a flat chisel
- Fig. 9 is a longitudinal section through flat chisel of Fig. 8 in the plane IX-IX
- FIG. 10 shows a cross section through the flat chisel of FIG. 8 in the plane XX. Identical or functionally identical elements are indicated by the same reference numbers in the figures, unless stated otherwise.
- Fig. 1 shows an exemplary flat chisel 1.
- the user can use the chisel 1 with a shaft 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 shank 2 of the exemplary flat chisel 1 is prismatic with a 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 2.
- 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 e.g. 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, both the dimension (length) along the longitudinal axis 7 and a dimension (width) along the transverse axis 9, 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 in the direction of impact 13 over the center of the cutting edge 3 in the direction of impact 13 stand out.
- 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. 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, e.g. 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 (Figure 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 about 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 portion 5 has between the struts 17 a parallel to the longitudinal axis 7 extending groove 18.
- the thickness of the groove 18 is less than the thickness of the struts 17.
- 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 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 17. Between the two struts 17 parallel to the longitudinal axis 7 a groove 18. The blade surface 15 between the two struts 17 is curved along the transverse direction 12 continuous concave. 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.
- a further flat chisel 20 (FIG. 5) is shown in a longitudinal section in the horizontal plane (FIG. 6) and a cross section in the plane 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 also has a blade-shaped working portion 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 shown 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 flat chisel 29 has a two-part cutting edge 30 of a main cutting edge 31 and a minor cutting edge 32.
- the main cutting edge 31 extends along the transverse axis 9.
- the main cutting edge 31 is arranged symmetrically with respect 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 minor cutting edge 32 is concave, e.g. circular, arched.
- the point of the cutting edge 3 farthest from the direction of impact 13 lies within the recess 33, i. 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 minor cutting edge 32. Preferably, 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)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP16182279.6A EP3278931A1 (de) | 2016-08-02 | 2016-08-02 | Flachmeissel |
| PCT/EP2017/069297 WO2018024666A1 (de) | 2016-08-02 | 2017-07-31 | Flachmeissel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3493950A1 true EP3493950A1 (de) | 2019-06-12 |
| EP3493950B1 EP3493950B1 (de) | 2021-03-10 |
Family
ID=56567463
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP16182279.6A Withdrawn EP3278931A1 (de) | 2016-08-02 | 2016-08-02 | Flachmeissel |
| EP17749169.3A Active EP3493950B1 (de) | 2016-08-02 | 2017-07-31 | Flachmeissel |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP16182279.6A Withdrawn EP3278931A1 (de) | 2016-08-02 | 2016-08-02 | Flachmeissel |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US11673246B2 (de) |
| EP (2) | EP3278931A1 (de) |
| CN (1) | CN109562509A (de) |
| WO (1) | WO2018024666A1 (de) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| USD921465S1 (en) | 2019-05-06 | 2021-06-08 | Milwaukee Electric Tool Corporation | Mortar knife |
| 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 (de) * | 2020-09-30 | 2022-04-06 | Hilti Aktiengesellschaft | Meissel und werkzeugaufnahme |
| USD1003133S1 (en) * | 2021-11-04 | 2023-10-31 | Joseph Lee | Drywall spike |
| USD1050839S1 (en) * | 2022-05-18 | 2024-11-12 | Hunan Sijiu Technology Co., Ltd | Chisel cutter |
| USD1045551S1 (en) | 2023-01-06 | 2024-10-08 | Milwaukee Electric Tool Corporation | Chisel |
| USD1046579S1 (en) | 2023-01-06 | 2024-10-15 | Milwaukee Electric Tool Corporation | Chisel |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE118286C (de) * | ||||
| 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 |
| 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 |
| US3191909A (en) * | 1963-03-29 | 1965-06-29 | Norbert M Reischl | Spot weld separator |
| CA1049767A (en) * | 1976-02-17 | 1979-03-06 | Harry A. Kerins | Nut cutter |
| DE2943291C2 (de) * | 1979-09-10 | 1983-02-10 | Schweizerische Aluminium AG, 3965 Chippis | Meissel für eine Einschlagvorrichtung und Verfahren zu dessen Betrieb |
| 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, 88085 Langenargen | Meißel |
| DE10100405C2 (de) * | 2001-01-05 | 2002-11-21 | Joh Hermann Picard Gmbh & Co | Handwerkzeug zur Bearbeitung von Steinen sowie gesteinsähnlichen Materialien |
| DE10208627A1 (de) * | 2002-02-28 | 2003-09-11 | Hawera Probst Gmbh | Flachmeißel |
| CN2645859Y (zh) * | 2003-10-29 | 2004-10-06 | 黄武槐 | 电锤套件 |
| EP1616670B1 (de) | 2004-07-13 | 2009-10-21 | BLACK & DECKER INC. | Meissel |
-
2016
- 2016-08-02 EP EP16182279.6A patent/EP3278931A1/de not_active Withdrawn
-
2017
- 2017-07-31 EP EP17749169.3A patent/EP3493950B1/de active Active
- 2017-07-31 CN CN201780045194.9A patent/CN109562509A/zh active Pending
- 2017-07-31 WO PCT/EP2017/069297 patent/WO2018024666A1/de not_active Ceased
- 2017-07-31 US US16/322,189 patent/US11673246B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| US20190184539A1 (en) | 2019-06-20 |
| WO2018024666A1 (de) | 2018-02-08 |
| EP3493950B1 (de) | 2021-03-10 |
| US11673246B2 (en) | 2023-06-13 |
| EP3278931A1 (de) | 2018-02-07 |
| CN109562509A (zh) | 2019-04-02 |
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