EP3978195A1 - Burin et porte outil - Google Patents

Burin et porte outil Download PDF

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Publication number
EP3978195A1
EP3978195A1 EP20199142.9A EP20199142A EP3978195A1 EP 3978195 A1 EP3978195 A1 EP 3978195A1 EP 20199142 A EP20199142 A EP 20199142A EP 3978195 A1 EP3978195 A1 EP 3978195A1
Authority
EP
European Patent Office
Prior art keywords
chisel
tool holder
section
working axis
insertion end
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Withdrawn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
EP20199142.9A
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 EP20199142.9A priority Critical patent/EP3978195A1/fr
Priority to EP21778459.4A priority patent/EP4221938A1/fr
Priority to US18/028,986 priority patent/US20230330826A1/en
Priority to CN202180051751.4A priority patent/CN115943018A/zh
Priority to PCT/EP2021/075765 priority patent/WO2022069273A1/fr
Publication of EP3978195A1 publication Critical patent/EP3978195A1/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Withdrawn legal-status Critical Current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
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/08—Means for retaining and guiding the tool bit, e.g. chucks allowing axial oscillation of the tool bit
    • B25D17/084—Rotating chucks or sockets
    • B25D17/088—Rotating chucks or sockets with radial movable locking elements co-operating with bit shafts specially adapted therefor
    • 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
    • B25D2217/0007—Shaft ends
    • 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
    • B25D2217/003—Details relating to chucks with radially movable locking elements
    • B25D2217/0034—Details of shank profiles

Definitions

  • the present invention relates to a chisel, in particular for a chisel and/or demolition hammer.
  • the chisel has a free insertion end, via which the chisel can be inserted into an insertion sleeve of a tool holder along a working axis.
  • the free insertion end has, at least in sections, a hexagonal cross section.
  • the present invention also relates to a tool holder for accommodating a percussive and/or rotating tool, in particular a chisel, coaxially to a working axis of the tool holder.
  • the tool holder has a base body with an insertion sleeve into which the tool can be inserted with a free insertion end.
  • the insertion sleeve is equipped with a hexagonal cross section, at least in sections.
  • Such chisels are basically known from the prior art and are used, for example, in the form of pointed chisels, flat chisels or spade chisels. Hexagonal cross-section spigots are typically referred to as HEX spigots. Corresponding tool holders are also known from the prior art.
  • the object is achieved in that at least one guide segment is formed on a surface of the free insertion end, which modifies the hexagonal cross section and extends along the working axis.
  • the invention includes the finding that a chisel often jams when it is inserted into a tool holder—more precisely, the free insertion end of the chisel is inserted into a corresponding insertion sleeve of the tool holder. Because at least one guide segment is formed on a surface of the free insertion end, which modifies the hexagonal cross section, the risk of the free insertion end tilting is reduced. This applies to both inserting and removing the chisel. At the same time it was observed that - if the insert sleeve of the tool holder is provided with a corresponding support section - the entry of metallic abrasions from the inside of a demolition hammer into the edges of the hexagonal cross-section of the socket can be reduced.
  • the insertion end has at least one locking groove for locking the insertion end in the insertion sleeve.
  • the locking groove preferably extends parallel to the working axis.
  • the locking groove is preferably assigned to a locking device of a tool holder.
  • the locking device of the tool holder can have a ball, for example, which protrudes through a locking recess, which is preferably formed in a base body of the tool holder, into the locking groove of the chisel. In this way, axial movement of the chisel along the working axis can be limited.
  • the chisel has a working side and the guide segment, based on the working axis and in the direction of view from the working side to the shank end, begins at the level of the locking groove at the earliest.
  • the guide segment is only located on a side of the locking groove that faces away from the working side.
  • the guide segment has a flat surface. It has turned out to be advantageous if the flat surface extends tangentially with respect to the working axis and is placed in the circumferential direction centrally over an edge of the hexagonal cross-section.
  • the guide segment can have a concavely curved surface in relation to the working axis. It has proven to be advantageous if this surface is arranged in the circumferential direction centrally between two adjacent edges of the hexagonal cross section on a flank of hexagonal cross section.
  • six guide segments are provided, which are arranged uniformly along a circumference. In a particularly preferred embodiment, exactly six guide segments are provided.
  • the object is achieved in that at least one support section is formed on an inner surface of the insertion sleeve, which extends parallel to the working axis of the tool holder and which preferably serves to support the insertion end.
  • the insertion sleeve has at least one locking recess for locking the insertion end in the insertion sleeve, the locking recess extending parallel to the working axis.
  • the locking recess is preferably part of the locking device already described above.
  • the insertion sleeve has an entry opening for the insertion end and the support section, in relation to the working axis, only extends on that side of the locking recess which faces away from the entry opening.
  • the support portion has a planar surface that extends tangentially with respect to the working axis and is circumferentially centered over an edge of the hexagonal cross-section.
  • the support section can have a concavely curved surface in relation to the working axis. It has proven to be advantageous if this surface is placed centrally in the circumferential direction between two adjacent edges of the hexagonal cross-section.
  • the tool holder has six support sections which are arranged uniformly along a circumference of the inner surface. It has proven to be advantageous if the support section is designed in one piece with the insertion sleeve.
  • the support section formed in the insertion sleeve corresponds to the guide segment formed on the chisel.
  • the support section and the guide segment are preferably in contact.
  • the invention is also achieved by an electric hand tool, in particular in the form of a demolition hammer or rotary hammer, with a chisel as described above and/or a tool holder as described above.
  • FIG. 1 A first preferred embodiment of a chisel 100 according to the invention is shown in figure 1 shown.
  • the chisel 100 is intended for use in an electric hand tool in the form of a demolition hammer 300 (cf. figure 2 ) definitely.
  • the chisel 100 has a free insertion end 110 via which the chisel 100 is inserted along a working axis A into an insertion sleeve 210 (cf. figure 2 ) a tool holder 200 of the demolition hammer 300 can be inserted.
  • the free insertion end 110 has a hexagonal cross section 115 .
  • a total of six guide segments 120 are formed on a surface OF of the free insertion end 110, which modify the hexagonal cross section 115 and each extend along the working axis A.
  • the six guide segments 120 are arranged uniformly along the circumferential direction UR on the shank 110 . Due to the perspective representation, in Figure 1A only three of the guide segments can be seen.
  • the six guide segments 120 each have a flat surface EOF, each of which extends in the tangential direction TR in relation to the working axis A. In the circumferential direction UR, each of the six guide segments 120 is placed centrally over an edge of the hexagonal cross section 115 . Thus, the hexagonal cross section 115 is modified to a dodecagonal cross section.
  • the free insertion end 110 has at least one locking groove 140 .
  • the locking groove 140 serves to lock the insertion end 110 in the insertion sleeve 210.
  • the locking groove 140 acts in conjunction with a locking recess 240 (cf. figure 2 ) to limit movement of the bit 100 in the axial direction along the working axis A.
  • the locking groove 140 extends parallel to the working axis A.
  • the chisel 100 the Figure 1A has a working page 190.
  • the guide segments 120 are only arranged on a side of the locking groove 140 which is remote from the working side 190 .
  • FIG. 2 A first preferred exemplary embodiment of a tool holder 200 according to the invention is shown in figure 2 shown. while showing Figure 2A a perspective sectional view of the tool holder 200. A cross section of the tool holder 200 (along the section line AA in figure 3 ) is in Figure 2B shown.
  • the tool holder 200 is used to hold the chisel 100 of figure 1 coaxial to a working axis A of the tool holder 200.
  • the tool holder 200 has a Body 290 with an insertion sleeve 210 on.
  • the chisel 100 can be inserted with a free insertion end 110 into this insertion sleeve 210 .
  • the insertion sleeve 210 has a hexagonal cross section 215 at least in sections.
  • Six support sections 220 are formed on an inner surface IOF of the insertion sleeve 210 , which extend parallel to the working axis A of the tool holder 100 and serve to support the free insertion end 210 .
  • the support sections 220 each have a flat surface EOF′, which extends in the tangential direction TR in relation to the working axis A and is each placed centrally above an edge 217 of the hexagonal cross section 215 in the circumferential direction UR. At this time, the six support portions 220 are evenly arranged along the circumferential direction UR of the inner surface IOF. Thus, the hexagonal cross-section 115 is transformed into a dodecagonal cross-section (cf. figure 4 ) modified.
  • the insertion sleeve 210 has at least one locking recess 240 for locking the insertion end 110 in the insertion sleeve 210, the locking recess 240 extending parallel to the working axis A.
  • the insertion sleeve 210 is equipped with an entry opening 211 for the insertion end 210 of the chisel 100 (cf. figure 1 ).
  • the six support sections 220 each extend, in relation to the working axis A, only on that side of the locking recess 240 which faces away from the entry opening 211 . If the chisel 100 the figure 1 is accommodated in the tool holder 200, the six guide segments 120 are in contact with the six support sections 220.
  • a second preferred embodiment of a chisel 100 according to the invention is in figure 5 shown.
  • the chisel 100 has a free insertion end 110 via which the chisel 100 is inserted along a working axis A into an insertion sleeve 210 (cf. figure 6 ) a tool holder 200 of the demolition hammer 300 can be inserted.
  • the free insertion end 110 has a hexagonal cross section 115 .
  • a total of six guide segments 120′ are formed on a surface OF of the free insertion end 110, which modify the hexagonal cross section 115 and each extend along the working axis A.
  • the six guide segments 120' are arranged uniformly along the circumferential direction UR on the insertion end 110. Due to the perspective representation, in figure 5 only three of the guide segments can be seen.
  • the guide segments 120 'in the embodiment of figure 5 each have a concavely curved surface KOF.
  • the Curvatures are each related to the working axis A.
  • the concavely curved surfaces KOF are each arranged centrally in the circumferential direction UR between two adjacent edges 117 of the hexagonal cross section 115 .
  • the guide segments 120 'in the embodiment of figure 5 each designed as elongated grooves.
  • the chisel has 100 of the figure 5 also a working page 190.
  • the guide segments 120 'in the embodiment of FIG figure 5 in relation to the working axis A and in the direction of view from the working side 190 to the shank end 110 already at the beginning of the locking groove 140.
  • FIG 4 A second preferred exemplary embodiment of a tool holder 200 according to the invention is shown in figure 4 shown. while showing figure 6 a perspective sectional view of the tool holder 200.
  • FIG 6 A cross section of the tool holder 200 (along the section line AA in figure 6 ) is in figure 7 shown.
  • the tool holder 200 is used to hold the chisel 100 of figure 3 coaxial to a working axis A of the tool holder 200.
  • the tool holder 200 has a base body 290 with an insertion sleeve 210.
  • the chisel 100 can be inserted with a free insertion end 110 into this insertion sleeve 210 .
  • the insertion sleeve 210 has a hexagonal cross section 215 at least in sections.
  • Six support sections 220 ′ are formed on an inner surface IOF of the insertion sleeve 210 , which extend parallel to the working axis A of the tool holder 100 and serve to support the free insertion end 210 .
  • the support sections 220 ′ each have a concavely curved surface KOF′ relative to the working axis A, this surface KOF′ being placed centrally between two adjacent edges 217 of the hexagonal cross section 215 in the circumferential direction UR.
  • the support portions 220 'in the embodiment of figure 4 each designed as an elongated support beads.
  • the six guide segments 120 (in the form of the elongate grooves) are in contact with the six support portions 220 (in the form of the six elongate support beads.)

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP20199142.9A 2020-09-30 2020-09-30 Burin et porte outil Withdrawn EP3978195A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP20199142.9A EP3978195A1 (fr) 2020-09-30 2020-09-30 Burin et porte outil
EP21778459.4A EP4221938A1 (fr) 2020-09-30 2021-09-20 Burin et raccord d'outil
US18/028,986 US20230330826A1 (en) 2020-09-30 2021-09-20 Chisel and tool fitting
CN202180051751.4A CN115943018A (zh) 2020-09-30 2021-09-20 凿刀和工具装配件
PCT/EP2021/075765 WO2022069273A1 (fr) 2020-09-30 2021-09-20 Burin et raccord d'outil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20199142.9A EP3978195A1 (fr) 2020-09-30 2020-09-30 Burin et porte outil

Publications (1)

Publication Number Publication Date
EP3978195A1 true EP3978195A1 (fr) 2022-04-06

Family

ID=72709020

Family Applications (2)

Application Number Title Priority Date Filing Date
EP20199142.9A Withdrawn EP3978195A1 (fr) 2020-09-30 2020-09-30 Burin et porte outil
EP21778459.4A Pending EP4221938A1 (fr) 2020-09-30 2021-09-20 Burin et raccord d'outil

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP21778459.4A Pending EP4221938A1 (fr) 2020-09-30 2021-09-20 Burin et raccord d'outil

Country Status (4)

Country Link
US (1) US20230330826A1 (fr)
EP (2) EP3978195A1 (fr)
CN (1) CN115943018A (fr)
WO (1) WO2022069273A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080292419A1 (en) * 2006-04-10 2008-11-27 Eugen Hild Tool Holder For a Rotary Hammer
US20100213676A1 (en) * 2007-10-10 2010-08-26 Ulrich Bohne Tool system
US20140183827A1 (en) * 2011-04-21 2014-07-03 Inovec Pty Ltd Chuck tool and bits
EP2492054B1 (fr) * 2011-02-23 2016-05-18 HILTI Aktiengesellschaft Porte-outil
DE102016101675A1 (de) * 2016-01-29 2017-08-03 Holger Zenz Hammereinrichtung
US20190184539A1 (en) * 2016-08-02 2019-06-20 Hilti Aktiengesellschaft Flat chisel
US20200122310A1 (en) * 2016-08-08 2020-04-23 Hilti Aktiengesellschaft Chisel

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080292419A1 (en) * 2006-04-10 2008-11-27 Eugen Hild Tool Holder For a Rotary Hammer
US20100213676A1 (en) * 2007-10-10 2010-08-26 Ulrich Bohne Tool system
EP2492054B1 (fr) * 2011-02-23 2016-05-18 HILTI Aktiengesellschaft Porte-outil
US20140183827A1 (en) * 2011-04-21 2014-07-03 Inovec Pty Ltd Chuck tool and bits
DE102016101675A1 (de) * 2016-01-29 2017-08-03 Holger Zenz Hammereinrichtung
US20190184539A1 (en) * 2016-08-02 2019-06-20 Hilti Aktiengesellschaft Flat chisel
US20200122310A1 (en) * 2016-08-08 2020-04-23 Hilti Aktiengesellschaft Chisel

Also Published As

Publication number Publication date
CN115943018A (zh) 2023-04-07
WO2022069273A1 (fr) 2022-04-07
EP4221938A1 (fr) 2023-08-09
US20230330826A1 (en) 2023-10-19

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