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EP3363596A1 - Burin - Google Patents

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Publication number
EP3363596A1
EP3363596A1 EP17156257.2A EP17156257A EP3363596A1 EP 3363596 A1 EP3363596 A1 EP 3363596A1 EP 17156257 A EP17156257 A EP 17156257A EP 3363596 A1 EP3363596 A1 EP 3363596A1
Authority
EP
European Patent Office
Prior art keywords
chisel
shaft
shank
head
bit
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Withdrawn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
EP17156257.2A
Other languages
German (de)
English (en)
Inventor
Jascha Marnette
Heinrich Pauli
Nahid Nora Elhami
Guenter Domani
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 EP17156257.2A priority Critical patent/EP3363596A1/fr
Priority to PCT/EP2018/053287 priority patent/WO2018149746A1/fr
Publication of EP3363596A1 publication Critical patent/EP3363596A1/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Withdrawn legal-status Critical Current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
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0003—Details of shafts of 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

Definitions

  • the present invention relates to a chisel, in particular a chisel for a hand tool.
  • a chisel for a hand tool is off US 5 145 237 A known.
  • the bit has a cylindrical shank with a male end for releasably locking the bit in the hand tool.
  • the other end of the shaft is transformed into a spike.
  • the pyramidal tip can be driven into a concrete floor by the power tool.
  • the underground should be blown up by it.
  • An experienced user knows the load limit of the subsurface, puts the bit accordingly close to an existing demolition edge and uses the existing weakening of the ground by the demolition edge to blow off further material of the ground. Due to inexperience and inattention, the chisel can be set too far from a demolition edge. As a result, the ground does not break even when the bit is fully driven. The ground clamps the chisel and the user can not pull the chisel out of the ground. The user has no choice but to break off the ground around the chisel with the help of a second chisel.
  • the chisel according to the invention for a hand tool machine for working mineral building materials has a shank, a spigot end and a chisel head.
  • the shaft of a steel is cylindrical or prismatic.
  • the insertion end is designed for locking the bit in the hand tool.
  • the chisel head of a sintered metal carbide is cone-shaped or pyramidal.
  • the chisel head projects radially beyond the shank.
  • the supernatant of the chisel head causes even with a complete driving of the bit into the ground of the shaft is not or at least not circumferentially. The bit may still be stuck in the ground when used improperly, but it can be pulled out of the chiseled hole by hand with some effort.
  • a surface of the bottom of the bit head is larger than a cross section of the shaft. In one embodiment, the bottom of the bit head has a circumferential chamfer, which is flush with the shaft.
  • Fig. 1 shows an exemplary bit 1 for mining steel reinforced concrete.
  • the bit 1 has an elongate shank 2 and a conical or pyramidal chisel head 3.
  • the shank 2 is made of steel and the chisel head 3 of sintered tungsten carbide.
  • the chisel head 3 is fixed to an end face 4 of the shaft 2 .
  • the chisel head 3 is wider than the end face 4 and protrudes radially beyond the shank 2 .
  • the shaft 2 may be a substantially cylindrical rod.
  • a diameter 5 of the shaft 2 is constant over its length, ie along the longitudinal axis 6 .
  • a cross section through the shaft 2 is, for example, circular or hexagonal.
  • the shaft 2 may be provided in sections with longitudinally extending ribs, which give the shaft 2 a star-shaped cross-section.
  • a longitudinal end of the shaft 2 forms an insertion end 7.
  • the insertion end 7 comprises a striking surface 8, which is formed by an end facing away from the chisel head 3 .
  • the striking surface 8 may be concave.
  • a hammer drill or other beating machine tool can exert on the face 8 strokes whose impact energy are introduced via the shaft 2 in the chisel head 3 .
  • the insertion end 7 can be locked in the hand tool.
  • locking grooves 9 are provided.
  • a radially projecting ring 10 is provided on the shaft 2 for locking. The locking grooves 9 and the ring 10 are arranged near the striking surface 8 .
  • the shaft 2 is preferably made of a low-alloy steel.
  • Low-alloy steels have additives for processing of up to 5% by weight, the most common additives are nickel, chromium, molybdenum, manganese, silicon and tungsten.
  • the surface of the shaft 2 may be thermally cured.
  • the chisel head 3 consists of a sintered hard material.
  • the hard phase is preferably tungsten carbide.
  • the hard phase has a proportion of more than 90 vol .-% of the hard material.
  • the remaining portion falls on a metallic binder containing predominantly cobalt or a cobalt nickel alloy.
  • the hard material can have a hardness of over 1350 HV10 (Vickers).
  • the base materials are mixed as fine-grained powders, brought into shape and sintered at temperatures between 1200 degrees Celsius (° C) and 1400 ° C.
  • a the chisel head 3 facing end 4 of the shaft 2 is preferably flat.
  • the chisel head 3 has a bottom 11 with a flat bottom surface 12, which is fixed to the flat end face 4 of the shaft 2 .
  • the chisel head 3 may be welded or soldered to the bottom 11 at the front side.
  • the shape of the chisel head 3 is adapted to the hard material and the material to be degraded, ie mineral building materials.
  • the exemplary chisel head 3 is conical.
  • the illustrated chisel head 3 tapers continuously from the bottom 11 in the direction (impact direction 13 ) to the tip 14.
  • the chisel head 3 has a height 15 of 5 mm to 30 mm.
  • the largest cross section of the bottom 11, here the bottom surface 12, is at least 60%, preferably at most 100% larger than the harmonic mean diameter 5 at 5 mm, 10 mm and 15 mm distance from the tip of the chisel head 3.
  • the cross sections through the chisel head 3 are highly preferably circular or elliptical. In alternative embodiments, the cross sections may be convex polygonal.
  • the chisel head 3 has a pyramidal shape.
  • the chisel head 3 is wider than the shaft 2 (see. Fig. 2 ).
  • the bottom 11 of the chisel head 3 projects radially relative to the shank 2 .
  • a diameter 16 of the bottom 11 or the bottom surface 12 is greater than the diameter 5 of the shaft 2.
  • the radial projection of the bottom 11 relative to the shaft 2 is preferably greater than 0.1 mm.
  • the supernatant is greater than the elastic deformation of the mineral substrate. The ground can not close behind the chisel head 3 until the substrate rests against the shank 2 .
  • the supernatant forms a mechanical weak point of the chisel head 3, in particular the fact that the supernatant can exert a force of gravity on the already heavily loaded joining zone between the shank 2 and the chisel head 3 .
  • the supernatant is preferably less than 1 mm.
  • the measure of the projection is half the difference between the diameter 16 of the bottom 11 and the diameter 5 of the shaft 2.
  • the part of the bottom 11 resting against the shaft 2 and the part of the bottom 11 protruding from the shaft 2 lie in one plane ,
  • the bit 17 has the same shaft 2 as the bit 1.
  • the bit head 18 has substantially the same conical or pyramidal shape as the preceding bit head 3.
  • the bottom 19 of the bit head 3 has a modified shape.
  • the bottom 11 in turn forms the largest cross-section of the bit head 18 and is opposite to the shaft 2 in the radial direction (see. Fig. 4 ).
  • the bottom 11 is fixed with its flat bottom surface 12 on the shaft 2 .
  • the bottom surface 12 is the same size as the end face 4 of the shaft 2.
  • the bottom 19 thereby merges flush into the shaft 2 .
  • the bottom 19 has a circumferential chamfer 20, which is inclined relative to the longitudinal axis 6 and from the bottom surface 12 in the direction of the tip 14 radially outwardly.
  • An angle of inclination of the chamfer 20 with respect to the longitudinal axis 6 is in the range between 30 degrees and 60 degrees.
  • the widest point, ie the largest cross section, of the bottom 19 is slightly offset from the shaft 2 .
  • the offset is preferably less than 1 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
EP17156257.2A 2017-02-15 2017-02-15 Burin Withdrawn EP3363596A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP17156257.2A EP3363596A1 (fr) 2017-02-15 2017-02-15 Burin
PCT/EP2018/053287 WO2018149746A1 (fr) 2017-02-15 2018-02-09 Burin

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17156257.2A EP3363596A1 (fr) 2017-02-15 2017-02-15 Burin

Publications (1)

Publication Number Publication Date
EP3363596A1 true EP3363596A1 (fr) 2018-08-22

Family

ID=58046577

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17156257.2A Withdrawn EP3363596A1 (fr) 2017-02-15 2017-02-15 Burin

Country Status (2)

Country Link
EP (1) EP3363596A1 (fr)
WO (1) WO2018149746A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3062306A (en) * 1959-03-19 1962-11-06 Sandvikens Jernverks Ab Drill bit
DE2008825A1 (de) * 1970-02-25 1971-09-16 Hilti Ag, Schaan (Liechtenstein) Bohrer mit Hartmetalleinlage
FR2264172A1 (en) * 1974-03-14 1975-10-10 Creusot Loire Mining tool with separable cutting tips - has split sleeve between steel shank and hollow tip, or tip brazed on
GB1604660A (en) * 1978-05-31 1981-12-16 Macdonald Pneumatic Tools Percussive cutting machine
AT368602B (de) * 1980-12-10 1982-10-25 Ver Edelstahlwerke Ag Fels- bzw. gesteinsbrecher-werkzeug
US5145237A (en) 1990-08-03 1992-09-08 Hilti Aktiengesellschaft Cutter bit with optimized shank

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3062306A (en) * 1959-03-19 1962-11-06 Sandvikens Jernverks Ab Drill bit
DE2008825A1 (de) * 1970-02-25 1971-09-16 Hilti Ag, Schaan (Liechtenstein) Bohrer mit Hartmetalleinlage
FR2264172A1 (en) * 1974-03-14 1975-10-10 Creusot Loire Mining tool with separable cutting tips - has split sleeve between steel shank and hollow tip, or tip brazed on
GB1604660A (en) * 1978-05-31 1981-12-16 Macdonald Pneumatic Tools Percussive cutting machine
AT368602B (de) * 1980-12-10 1982-10-25 Ver Edelstahlwerke Ag Fels- bzw. gesteinsbrecher-werkzeug
US5145237A (en) 1990-08-03 1992-09-08 Hilti Aktiengesellschaft Cutter bit with optimized shank

Also Published As

Publication number Publication date
WO2018149746A1 (fr) 2018-08-23

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