WO2013024424A1 - Foret amélioré pour maçonnerie - Google Patents

Foret amélioré pour maçonnerie Download PDF

Info

Publication number
WO2013024424A1
WO2013024424A1 PCT/IB2012/054118 IB2012054118W WO2013024424A1 WO 2013024424 A1 WO2013024424 A1 WO 2013024424A1 IB 2012054118 W IB2012054118 W IB 2012054118W WO 2013024424 A1 WO2013024424 A1 WO 2013024424A1
Authority
WO
WIPO (PCT)
Prior art keywords
hole
undercut
drill bit
shaft
diameter
Prior art date
Application number
PCT/IB2012/054118
Other languages
English (en)
Inventor
Jules Joseph CRYNS
Original Assignee
Cryns Jules Joseph
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 Cryns Jules Joseph filed Critical Cryns Jules Joseph
Publication of WO2013024424A1 publication Critical patent/WO2013024424A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/0018—Drills for enlarging a hole
    • B23B51/0036—Drills for enlarging a hole by a tool-carrying eccentric
    • 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
    • B28D1/14—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by boring or drilling
    • B28D1/146—Tools therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2226/00—Materials of tools or workpieces not comprising a metal
    • B23B2226/75—Stone, rock or concrete

Definitions

  • the present invention relates to a drill for boring a hole for fixing an anchor into.
  • the invention relates to a drill for boring a hole having at least one undercut region into a hard material such as masonry or rock.
  • fastening means for anchoring an object into a support structure and in particular (but not exclusively), into a hard structure such as masonry or stone.
  • a known type of fastener includes a threaded shaft surrounded by a sleeve with expanding portions.
  • the fastener is generally cylindrical prior to insertion into a generally cylindrical anchoring hole. After insertion into the hole of the support structure, the expanding portions are spread apart anchoring the fastener into the hole. This may be achieved a number of ways and is usually actuated by tightening a threaded portion to move a wedge into the sleeve, thereby splaying the expanding portions outwards.
  • the pull out strength is improved if the material of the support structure allows some yielding in which the spreading portions of the sleeve can be accommodated.
  • the rigidity of the support material is a critical factor determining the degree to which the expanding portions can expand and thereby achieve good fixation into the hole. While these known anchor bolt types can perform satisfactorily, they are relatively expensive requiring a relatively complex fastener with a number of parts. Further, where the material is hard, the pull out strength can be reduced as the expanding portions are limited.
  • Another technique for fastening into a support structure has been to use a setting material such as epoxy resin.
  • a setting material such as epoxy resin.
  • a generally cylindrical fastener can then be set into the hole using epoxy or a similar setting material.
  • this fixation system it is desirable to have surface features on the anchor element which aid the epoxy gripping the anchor.
  • this technique is particularly suitable for fixing reinforcing bar (with surface ridges) into a masonry support surface.
  • the pull-out strength of the anchor system is mostly determined by the fixation of the epoxy against the surface of the hole bored into the concrete.
  • Both of the above mentioned anchoring techniques are reliant on characteristics of the hole and the material in which the hole is bored, in order to provide adequate fixation. These techniques would benefit from an undercut feature of the hole bored into the support structure into which the expanding components or epoxy resin can expand or flow.
  • the present invention broadly comprises in a drill bit comprising :
  • a shaft having first and second ends, said first end including at least one cutting edge,
  • a bearing surface located a first distance along said shaft from said first end and eccentric to the longitudinal axis of said shaft.
  • said shaft is substantially rigid.
  • said second end is adapted to be received into a chuck of a drill.
  • said second end includes one or more flat surfaces parallel with the longitudinal axis of said shaft at said second end.
  • said shaft is fluted.
  • bearing surface is smooth.
  • said first end includes:
  • said cutting edge or said cutting edges comprise a hard material fixed on to said shaft.
  • said hard material is one or more of:
  • the longitudinal axis of said shaft is not rectilinear.
  • said shaft axis is bent through 2 to 20 degrees from rectilinear.
  • said shaft axis is bent by 3 to 15 degrees from rectilinear.
  • said shaft axis is bent by 5 to 10 degrees from rectilinear. According to further aspect said bend is located in the vicinity of said bearing surface. According to further aspect said bend comprises a curve between approximately said first end and approximately the location of said bearing surface.
  • said shaft axis is substantially rectilinear between approximately the location of said bearing surface and said second end.
  • At least a portion of said bearing surface is approximately parallel with the longitudinal axis of said shaft.
  • a lower portion adjacent said bearing surface is tapered onto the shaft, to form a Vamp' portion.
  • said cutting surface or said cutting surfaces are asymmetrical with respect to said first end of said shaft.
  • said cutting surface or said cutting surfaces are symmetrical with respect to said first end of said shaft.
  • said cutting surface or said cutting surfaces are not eccentric with respect to the longitudinal axis at said first end of said shaft.
  • said shaft is not flexible.
  • the invention broadly comprises a method of boring an undercut hole having a longitudinal direction using a drill bit as claimed in any one of the preceding claims, wherein said hole has a primary hole diameter, and
  • an undercut located a first distance from the entry surface of said hole, said undercut being of a secondary undercut diameter and larger than said primary hole diameter.
  • said hole includes two undercuts separated along said longitudinal direction.
  • said two undercuts are separated along said longitudinal direction by a section of said hole of said primary hole diameter.
  • said hole transitions from said primary hole diameter to said secondary undercut diameter gradually. According to a further aspect said hole transitions from said secondary undercut diameter to said primary hole diameter gradually. According to a further aspect said first undercut is said first distance from said entry surface and said second undercut is approximately said first distance from the deepest portion of said first undercut.
  • said method requires pushing said drill bit substantially in line with said longitudinal direction of said hole.
  • said method does not require substantial movement of said drill off axis from said longitudinal direction of said hole.
  • said primary diameter of said hole is larger than the diameter of said shaft.
  • bearing surface bears on a surface defining said hole of said primary hole diameter.
  • the invention broadly comprises an undercut hole bored into a material according to the method of the previous clauses comprising :
  • a first undercut located a first distance from the entry surface of said hole, said undercut being of a secondary undercut diameter and larger than said primary hole diameter
  • undercuts are separated along said longitudinal direction by a section of said hole of said primary hole diameter.
  • said hole transitions from said primary hole diameter to said secondary undercut diameter gradually.
  • said hole transitions from said secondary undercut diameter to said primary hole diameter gradually.
  • said first undercut is said first distance from said entry surface and said second undercut is approximately said first distance from the deepest portion of said first undercut.
  • bearing surface bears on a surface defining said hole of said primary hole diameter.
  • the invention broadly comprises a method of anchoring an elongate member into a surface comprising :
  • step of fixing comprises one or more of:
  • said fixing compound is:
  • the invention broadly comprises a drill bit substantially as herein described and with reference to any one or more of the drawings.
  • the invention broadly comprises a method of boring an undercut hole substantially as herein described and with reference to any one or more of the drawings.
  • the invention broadly comprises an undercut hole substantially as herein described and with reference to any one or more of the drawings.
  • the invention broadly comprises a method of anchoring an elongate member into a surface substantially as herein described and with reference to any one or more of the drawings.
  • the term “comprising” as used in this specification and claims means “consisting at least in part of”. When interpreting each statement in this specification and claims that includes the term “comprising”, features other than that or those prefaced by the term may also be present. Related terms such as “comprise” and “comprises” are to be interpreted in the same manner.
  • Figure 1 is a side view of a drill bit according to the present invention.
  • Figure 2a is a side view of the drill bit of Figure 1 shown in the initial stages of hole boring.
  • Figure 2b is a side view of the drill bit of Figure 2a shown deeper into the hole.
  • Figure 3a is a side view of the drill bit of Figure 1 shown in the initial stages of hole boring.
  • Figure 3b is a side view of the drill bit of Figure 3a shown deeper into the hole.
  • Drill bit 1 comprises an elongate shaft 6 and is preferably also fluted with spiral flutes 7 as is known in order to aid with material (chip) extraction during the boring of a blind hole.
  • a cutting tip 2 At a first end of elongate shaft 6, is a cutting tip 2.
  • Cutting tip 2 preferably comprises at least one cutting edge 4.
  • Cutting edge(s) 4 is (are) preferably of a hard material, or alternatively is of the same material as shaft 6.
  • the cutting edge(s) 4 may comprise one or more inserts of a hard material such as a carbide (eg tungsten), diamond or any other suitable hard material bonded to the shaft 6.
  • the cutting edges 4 may be formed from the same material as shaft 6 and may also have a hardening process or coating applied thereto, such as tempering or specialized hard surface coatings.
  • the cutting tip 2 of drill 1 may have a single cutting edge 4, or may alternatively have a plurality of cutting edges as is generally known in the art.
  • the cutting tip 2 may have between two and five cutting edges 4.
  • drill 1 has at its second end 3, means for a chuck of a drill to engage with it to prevent slipping during rotation and impacts.
  • the second end 3 of drill bit 1 may include one or more flat surfaces 8 aligned parallel with the longitudinal axis 10 of shaft 6.
  • second end 3 may include one or more splines or key ways.
  • the bearing surface 5 is located eccentric to the longitudinal axis 10 of the shaft 6.
  • a portion of the bearing surface is approximately parallel with the longitudinal axis of the shaft 6 such that it is approximately parallel with the walls of the bored hole during drilling.
  • the lower portion (towards the cutting tip 2) of the bearing surface 5 is tapered onto the shaft, to form a Vamp' portion 19.
  • the bearing surface is smooth and/or of a hard material in order to resist wear.
  • the bearing surface 5 comprises an insert of a hard material bonded to shaft 6, for example carbide or a hardened material.
  • the bearing surface 5 comprises the same material as shaft 6, and may be integrally formed with shaft 6.
  • the material may be treated to improve its hardness.
  • the bearing surface may be subsequently formed by welding for example. The general purpose of the bearing surface 5 is not to cut into the wall of the hole, but to bear against it.
  • the shaft 6 of drill 1 is not rectilinear along its entire length. That is, while a significant portion of the shaft 6 (between end 3 and approximately bearing surface 5) is straight, the cutting tip 2 is bent through a small angle 9 from straight. Preferably the bend is located in the general vicinity of bearing surface 5. The orientation of the bend is preferably such that the tip 2 is bent away from the outer most part of the eccentric bearing surface 5.
  • the bend of cutting tip 2 is through approximately 2 to 20 degrees from the longitudinal axis 10. In another embodiment, the bend of cutting tip 2, is through approximately 3 to 15 degrees from the longitudinal axis 10. In still another, most preferred embodiment, the bend of cutting tip 2, is through approximately 5 to 10 degrees from the longitudinal axis 10.
  • cutting edge(s) 4 may be asymmetrical. In particular for embodiments with a bend in the shaft, the cutting edge opposite the bearing surface 5 will do most of the cutting. In this context, the term asymmetrical is intended to include a single cutting edge 4, located asymmetrically with respect to the shaft 6.
  • the cutting edge 4 opposite the bearing surface 5 is shorter. In another embodiment the cutting edge 4 opposite the bearing surface 5, is at a larger angle with respect to the longitudinal axis of the shaft 6.
  • the drill bit of the present invention is constructed from a substantially rigid and preferably metallic material. It is an important distinction that the drill bit of the present invention is not intended to be particularly "flexible” during the boring process. That is, the shaft of the drill bit remains substantially un-flexed during normal operation.
  • the term "rigid” used in this sense is intended to mean sufficiently stiff such that during the boring process, the undercut that is formed does not rely, to any significant extent, on deformation of the drill bit due to its flexibility.
  • the term is intended to contrast those so called “flexible drilling” methods that rely on the flexing of the drill bit to influence the drilling direction of the drilled hole.
  • Drill bit 1 has been described above as preferably a single piece of sufficient length to bore a hole. However, alternative embodiments may include one or more straight drill extension pieces to lengthen the drill bit 1 for deeper holes. These extensions could be added to the drill bit 1, before drilling begins, or could be added in stages as drilling progresses deeper.
  • FIG 2a illustrates the drill 1 in position as it initially bores into structure 17 (such as concrete or other material).
  • structure 17 such as concrete or other material
  • the primary diameter 13 of the hole 11 will be approximately slightly larger that of the drill 1 due to the slight offset.
  • the bearing surface 5 has yet to contact the wall 18 of the hole.
  • the depth of the hole with a primary diameter 13 is illustrated by numeral 15.
  • a lower Vamp' portion 19 adjacent the bearing surface 5 comes into contact with the wall 18 of the hole. This pushes the opposite cutting edge 4 outwards to slightly enlarge the hole diameter as the drill bit is pushed further in.
  • the result is a transition region 20 where the diameter of the hole is increasing.
  • the bearing surface 5 is shown fully in contact with the hole wall 18, and the diameter of the hole 11 has stabilised to form an undercut 14 of a secondary diameter larger than the primary diameter.
  • the drill bit 1 can be pushed further into the material to keep boring an undercut portion with a secondary diameter, while the bearing portion is still in contact with the hole of primary diameter.
  • Figure 2b shows approximately the maximum depth of the undercut hole with secondary diameter, for the drill bit illustrated.
  • the drill can be removed. It may be necessary or desirable to clean debris from the hole by any convenient method such as a jet of compressed air into the hole for example.
  • the undercut hole is now ready for insertion of an appropriate anchor system.
  • the undercut allows the anchor to gain maximum purchase in the structure 17. In fact if there is sufficient distance 15 (from the undercut portion 14 to the surface 16), the pullout strength can approximately meet the shear strength of the material 17.
  • the bearing surface is no longer in contact with the hole wall 18.
  • the drill bit 1 can centre itself and begin drilling a second hole portion 22 of primary diameter, essentially repeating the drilling process.
  • the bearing surface 5 is shown fully in contact with the hole wall 18 (of the second hole of primary diameter 22), and the diameter of the hole has stabilised to form a second undercut 24 of the secondary diameter.
  • the drill bit 1 can be pushed further into the material to keep boring an undercut portion 24 with a secondary diameter, while the bearing portion 5 is still in contact with the hole wall 18 of primary diameter.
  • FIG. 3b illustrates the beginnings of a third undercut region forming at the bottom of the hole.
  • the distance between the cutting edge(s) 4 and the bearing surface 5, dictate the depth of the undercut region(s) 14,24.
  • the distance 15 between the upper surface and the first undercut, and (for multiple undercut holes) the corresponding spacing between successive undercut regions.
  • the length of the bearing surface influences the length of the undercut region(s).
  • the undercut hole may be tailored to suit the location of the expanding portions.
  • a 100mm fastener may have expanding portions on the last 20-30mm.
  • the undercut may be desired to be positioned at the end 20-30mm of the hole, with a hole depth chosen to correspond to the expected insertion depth of the fastener (eg 80-95mm).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Abstract

L'invention concerne un foret destiné à percer un trou chambré, comportant une tige à une extrémité de laquelle se trouve au moins une arête de coupe. La tige du foret comporte en outre une surface d'appui située de façon excentrique par rapport à l'axe de la tige. Pendant le perçage, le foret peut produire un trou borgne comportant un ou plusieurs chambrages à différentes profondeurs.
PCT/IB2012/054118 2011-08-17 2012-08-14 Foret amélioré pour maçonnerie WO2013024424A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NZ59465211 2011-08-17
NZ594652 2011-08-17

Publications (1)

Publication Number Publication Date
WO2013024424A1 true WO2013024424A1 (fr) 2013-02-21

Family

ID=47714830

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2012/054118 WO2013024424A1 (fr) 2011-08-17 2012-08-14 Foret amélioré pour maçonnerie

Country Status (1)

Country Link
WO (1) WO2013024424A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109590694A (zh) * 2019-01-25 2019-04-09 江苏迈信林航空科技股份有限公司 深盲孔的加工方法
WO2023126252A1 (fr) * 2021-12-27 2023-07-06 Robert Bosch Gmbh Foret et système comprenant une machine-outil portative et le foret

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19528673A1 (de) * 1995-08-04 1997-02-06 Fischer Artur Werke Gmbh Bohrvorrichtung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19528673A1 (de) * 1995-08-04 1997-02-06 Fischer Artur Werke Gmbh Bohrvorrichtung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109590694A (zh) * 2019-01-25 2019-04-09 江苏迈信林航空科技股份有限公司 深盲孔的加工方法
WO2023126252A1 (fr) * 2021-12-27 2023-07-06 Robert Bosch Gmbh Foret et système comprenant une machine-outil portative et le foret

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