EP1304199A1 - Hohlbohrer mit Verschleissschutz - Google Patents

Hohlbohrer mit Verschleissschutz Download PDF

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Publication number
EP1304199A1
EP1304199A1 EP01308858A EP01308858A EP1304199A1 EP 1304199 A1 EP1304199 A1 EP 1304199A1 EP 01308858 A EP01308858 A EP 01308858A EP 01308858 A EP01308858 A EP 01308858A EP 1304199 A1 EP1304199 A1 EP 1304199A1
Authority
EP
European Patent Office
Prior art keywords
cutting
tool
support body
cutting elements
elements
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Withdrawn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
EP01308858A
Other languages
English (en)
French (fr)
Inventor
Mario Halbeisen
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.)
Marcrist International Ltd
Original Assignee
Marcrist International Ltd
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 Marcrist International Ltd filed Critical Marcrist International Ltd
Priority to EP01308858A priority Critical patent/EP1304199A1/de
Publication of EP1304199A1 publication Critical patent/EP1304199A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/04—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs
    • B28D1/041—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs with cylinder saws, e.g. trepanning; saw cylinders, e.g. having their cutting rim equipped with abrasive particles

Definitions

  • the present invention relates generally to core drills, and more particularly but not necessarily to core drills of the type having diamond or other abrasive cutting members for use in cutting masonry and stone.
  • a generic core-cutting tool 1 is shown in Figures 1 and 2.
  • the core tool is attached, via connecting means 4, to a machine, which acts as a driving source, typically a drill.
  • a machine which acts as a driving source, typically a drill.
  • the cutting elements 2 which are mounted on the tubular support body 3, impart a cutting action upon the chosen material e.g. stone, thus creating a hole in the said material; hereinafter referred to as the work piece.
  • the work piece As the core-cutting tool is worked, it moves into the hole being cut in the work piece thereby maintaining the cutting force imparted on the work piece.
  • the cutting elements prefferably be arranged so as to cut a hole in the work piece that is of sufficient size to receive the tubular support body as the core-cutting tool moves into the hole.
  • the size difference between the radius of the tubular support body, and the radius of the hole cut by the cutting elements is known as the side clearance ⁇ .
  • the size of the side clearance has a noticeable effect on the functionality of a core-cutting tool.
  • a large side clearance will allow the tubular support body to enter the hole with a minimised likelihood of jamming.
  • the resulting increased width of the cutting elements means that more material has to be removed, which leads to longer cutting times, slower penetration and the need for an increased level of feed pressures all of which in turn lead to increased machine wear and operator fatigue.
  • a small side clearance provides a much easier cut due to the smaller amount of material being removed.
  • the cutting is easier, the likelihood of jamming and/or snagging is greatly increased, which causes a severe safety hazard.
  • Jamming and stalling can burn out the machines or their clutches and/or severely injure the operator if the clutch of the machine does not work efficiently. Jamming can also be hazardous if the machine is too powerful for the operator to hold when the tool has jammed. Repeated jamming can lead to wear on the tubular support body, and/or deformation of the tubular support body due to overheating. Side wear and abrasion are also caused by repeated jamming.
  • the invention provides a core-cutting tool comprising: a tubular support body having connection means for connection to drive means and, arranged on one end thereof, an annulus of cutting elements; characterised in that the inner and/or outer surface of the tubular support body comprises at least one abrasive element, positioned between the connection means and the annulus of cutting elements, which does not extend radially beyond the cutting extent of the annulus.
  • the arrangement of at least one abrasive element on the support body will permit the core-cutting tool to cut itself free and thereby minimise the safety hazards discussed above.
  • the reduction in jamming will also reduce the wear and deformation caused to the core-cutting tool.
  • the support body may comprise a plurality of abrasive elements on the inner and/or outer surface of the tubular support body.
  • the abrasive elements will be attached to the support body by welding, soldering, gluing or the like. It will be appreciated from the invention that alternative fixing methods may be used, such as screw attachment.
  • the abrasive elements comprise further cutting elements.
  • both the cutting elements and the further cutting elements may be those suitable for cutting stone and masonry, such as diamond matrix or silicon carbide.
  • the abrasive element(s) may comprise a simple roughened surface like sand paper or a metal file.
  • Figure 3 shows a core-cutting tool with a first set of cutting elements 2 arranged on one end of the tubular support body 3. It will be appreciated from the invention that the type of cutting element used depends upon the material being tooled.
  • connection means 4 At the opposite end of the tubular support body 3 is arranged connection means 4 to permit the tool to be connected to a drive source, such as a power drill or the like.
  • a second set of cutting elements 5 are arranged radially around the sidewalls of the tubular support body 3.
  • the side cutting elements can be attached in many ways, such as welding, soldering and gluing. Other methods of attachment include electroplating and even screw fixing. It is also appreciated that, alternatively, the sidewalls themselves may be adapted to provide the abrasive element(s) in a manner similar to a metal file, for example having rasps.
  • the second set of cutting elements could be made from a similar material as the first set of cutting elements, although this does not have to be the case.
  • Both sets of cutting elements exert a cutting force, the first set cuts into the work piece and the second set prevents snagging of the tubular support body 3 within the work piece by cutting itself free of any obstacles that could cause snagging.
  • the second set of cutting elements 5 comprise a collection of elements with triangular shaped plans, arranged in rows around the circumference of the tubular support body 3.
  • different shaped cutting elements such as those with rectangular plans and circular plans, may be used.
  • the second set of cutting elements 5 extend radially from the tubular support body 3. It can also be appreciated that the second set of cutting elements 5 do not extend beyond the first set of cutting elements 2. Although the second set of cutting elements 5 only extend outwards in the figure, it is appreciated that they may extend radially inwards instead. It is also appreciated that a combination of cutting elements extending radially, both outwards and inwards, may have further advantages.
  • Figure 5 shows a second preferred embodiment of the invention.
  • the tubular support body 3 has a slit 6 in a sidewall thereof. It is understood in the art that such slits are beneficial as they provide, amongst other things, ventilation to the core-cutting tool thus minimising heat build up, which can lead to tool deformation. It will be appreciated that slits of different dimensions will have equal merit.
  • a second set of cutting elements 7 are arranged on the leading edge of the slit 6, so that as the tool rotates the cutting elements 7 exert a cutting force on any obstacles that may cause snagging or jamming.
  • the cutting elements 7 also protect the slit 6 from wear caused by said obstacles and because the slit 6 can be a area of weakness in the tool this protection is beneficial.
  • Figure 6 shows the positioning of the second set of cutting elements 7 within the slit 6.
  • Figure 7 shows an alternative embodiment of the invention, wherein the layer of abrasive material 8 is attached to the outer wall of the tubular supports structure 3.
  • the abrasive material would preferably be glued to the supports structure, but it is appreciated that alternative fixing methods would be equally viable. It is appreciated that the type of abrasive material used depends on the type of material being worked by the tool.
  • a coating of diamond matrix or silicon carbide would be used with masonry or stone.
  • a less resilient abrasive material such as sandpaper, glasspaper or the like, could be used.
  • a coating of abrasive material 8 is attached to both the inner and outer surfaces of the tubular support structure sidewall.
  • a coating of abrasive material 8 may be present on only one of the surfaces of the support structure sidewall.
  • FIG. 9 shows an embodiment where abrasive material only covers a section 9 of the sidewall. Any number of different shaped sections 9 could be used as is required.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
EP01308858A 2001-10-18 2001-10-18 Hohlbohrer mit Verschleissschutz Withdrawn EP1304199A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01308858A EP1304199A1 (de) 2001-10-18 2001-10-18 Hohlbohrer mit Verschleissschutz

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01308858A EP1304199A1 (de) 2001-10-18 2001-10-18 Hohlbohrer mit Verschleissschutz

Publications (1)

Publication Number Publication Date
EP1304199A1 true EP1304199A1 (de) 2003-04-23

Family

ID=8182372

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01308858A Withdrawn EP1304199A1 (de) 2001-10-18 2001-10-18 Hohlbohrer mit Verschleissschutz

Country Status (1)

Country Link
EP (1) EP1304199A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018146436A1 (en) * 2017-02-13 2018-08-16 Derek Alfred Ward Hole-saw

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE472575A (de) *
US3848687A (en) * 1972-02-08 1974-11-19 Eishin Kk Hole saw
JPS50146988A (de) * 1974-05-18 1975-11-25
JPH03156091A (ja) * 1989-11-11 1991-07-04 Noritake Dia Kk コアビット
US5069584A (en) * 1989-01-20 1991-12-03 Hilti Aktiengesellschaft Hollow drilling tool
EP0985505A2 (de) * 1998-09-10 2000-03-15 Atock Co., Ltd. Kreissägeblatt, Innenlochsäge, Hohlbohrwerkzeug und dieser Werkzeuge verwendende Maschinen
JP2000141357A (ja) * 1998-11-17 2000-05-23 Sankyo Diamond Kogyo Kk ダイヤモンドコアビット及びその製造方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE472575A (de) *
US3848687A (en) * 1972-02-08 1974-11-19 Eishin Kk Hole saw
JPS50146988A (de) * 1974-05-18 1975-11-25
US5069584A (en) * 1989-01-20 1991-12-03 Hilti Aktiengesellschaft Hollow drilling tool
JPH03156091A (ja) * 1989-11-11 1991-07-04 Noritake Dia Kk コアビット
EP0985505A2 (de) * 1998-09-10 2000-03-15 Atock Co., Ltd. Kreissägeblatt, Innenlochsäge, Hohlbohrwerkzeug und dieser Werkzeuge verwendende Maschinen
JP2000141357A (ja) * 1998-11-17 2000-05-23 Sankyo Diamond Kogyo Kk ダイヤモンドコアビット及びその製造方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 015, no. 386 (M - 1163) 30 September 1991 (1991-09-30) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 08 6 October 2000 (2000-10-06) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018146436A1 (en) * 2017-02-13 2018-08-16 Derek Alfred Ward Hole-saw
US11179784B2 (en) 2017-02-13 2021-11-23 Marc Steven KATZ Hole-saw

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