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EP2271467A1 - Blade of a tool for cutting a duct, more particularly a ventilation duct - Google Patents

Blade of a tool for cutting a duct, more particularly a ventilation duct

Info

Publication number
EP2271467A1
EP2271467A1 EP09742188A EP09742188A EP2271467A1 EP 2271467 A1 EP2271467 A1 EP 2271467A1 EP 09742188 A EP09742188 A EP 09742188A EP 09742188 A EP09742188 A EP 09742188A EP 2271467 A1 EP2271467 A1 EP 2271467A1
Authority
EP
European Patent Office
Prior art keywords
blade
duct
tool
cutting
truncating
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Withdrawn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
EP09742188A
Other languages
German (de)
French (fr)
Other versions
EP2271467A4 (en
Inventor
Jari Hokkanen
Erik ÖSTERLUND
Stefan Strandberg
John Grieves
Jonas Dolk
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.)
Flaekt Woods AB
Original Assignee
Flaekt Woods AB
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 Flaekt Woods AB filed Critical Flaekt Woods AB
Publication of EP2271467A1 publication Critical patent/EP2271467A1/en
Publication of EP2271467A4 publication Critical patent/EP2271467A4/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B7/00—Hand knives with reciprocating motor-driven blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D29/00—Hand-held metal-shearing or metal-cutting devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B9/00—Blades for hand knives
    • B26B9/02—Blades for hand knives characterised by the shape of the cutting edge, e.g. wavy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
    • B26D3/16—Cutting rods or tubes transversely
    • B26D3/169—Hand held tube cutters

Definitions

  • the object of this invention is a blade of a tool for cutting, e.g. for truncating, a duct, more particularly a ventilation duct, which blade is fixed to the tool in a detachable manner.
  • an electrically-powered metal shear is generally used, especially a metal shear manufactured by Draco, which is fast and produces very few impurities in the duct to be truncated.
  • the cut edge it produces is also so neat that it does not require after- treatment. Furthermore it is noiseless and safe in operation, and also it is suited in practice to pipes of all sizes.
  • a starting hole must be made in the duct, e.g. by punching with a sheath knife or by drilling. This is of course an extra work phase and nowadays requires a separate tool. Additionally, the use of a sheath knife is often an occupational safety risk.
  • the purpose of the invention is to achieve a new type of blade of a tool, more particularly a metal shear, with which the aforementioned drawback is avoided.
  • the blade of the tool according to the invention is characterized in that the tip part of the blade is shaped to be sharp such that by means of it a starting hole can be punched in the duct.
  • One preferred embodiment of the blade according to the invention is characterized in that the tip part of the blade is shaped to curve downwards, in which case it does not impair the actual cutting of the duct.
  • One advantage of the invention that can be mentioned is that a starting hole can be made in the duct with the same tool with which the actual cutting, e.g. truncation, is performed. This speeds up the procedure, requires fewer tools and also increases occupational safety.
  • Fig. 1 presents a tool, which is provided with a blade according to the invention.
  • Fig. 2 presents the blade detached from the tool.
  • Figs. 3A-3D present the different phases of the use of the tool and its blade.
  • Fig. 1 thus presents a prior-art metal shear 1 (e.g. a metal shear manufactured by Draco), into which the new type of blade 2 according to the invention is installed in a detachable manner.
  • This type of metal shear can preferably be electrically-operated, containing possibly also a provision for battery powering.
  • the invention is not limited to exactly this shear and to electrical powering, however, but instead other types of cutters are viable, e.g. pneumatically-operated or even manually-operated shears.
  • the prior art cutting blade in this type of tool is shorter and it comprises an obtuse tip, because the actual cutting is performed with a vertical to-and-fro movement of the blade, in which the grooved upper surface 3 (Fig. 2) together with the adjacent countersurfaces of the tool perform the actual cutting in a manner that is in itself prior art.
  • this cutting procedure occurs with a fully known method (as described above).
  • the difference to a prior-art blade is the shaping of the tip of the blade.
  • the tip of the blade 2 is elongated and sharp. In addition, it curves preferably downwards, in which case it does not impair the actual cutting. If the blade were straight, the tip would engage the inner surface of the duct when truncating a duct of round cross- sectional shape.
  • Figs. 3A-3D present the use of the blade according to the invention in a prior-art tool in connection with the cutting of a duct 4.
  • the duct can be a conventional sheet metal ventilation duct.
  • the blade 2 of the tool 1 is punched through the flank of the duct at the desired point for in order to make the starting hole.
  • the truncating (cutting) of the duct is performed with the tool, in a manner that is in itself prior-art, by turning the tool to- and-fro as indicated by the arrows (Figs. 3C and 3D) and by pushing the tool forwards as the truncating progresses.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Details Of Cutting Devices (AREA)
  • Knives (AREA)

Abstract

Blade (2) of a tool (1) for cutting, e.g. for truncating, a duct (4), more particularly a ventilation duct, which blade (2) is fixed to the tool (1) in a detachable manner. The invention is implemented such that the tip part of the blade (2) is shaped to be sharp such that by means of it a starting hole can be punched in the duct (4).

Description

BLADE OF A TOOL FOR CUTTING A DUCT, MORE PARTICULARLY A VENTILATION DUCT
The object of this invention is a blade of a tool for cutting, e.g. for truncating, a duct, more particularly a ventilation duct, which blade is fixed to the tool in a detachable manner.
Many different tools and methods for truncating, or cutting in some other way (making a service aperture, etc.), ventilation ducts.
Different electrically-operated and pneumatically operated tools are most commonly used. Conventionally, e.g. an angle grinder is used, which however comprises the drawback of, among other things, sparking, in which case the use of it requires a hot work permit. In addition it produces a lot of impurities on the inner surface of the pipe.
Many tools are suited for truncating only smaller duct sizes. These types are e.g. manually-operated metal shears, a piercing saw and certain nibblers.
Nowadays an electrically-powered metal shear is generally used, especially a metal shear manufactured by Draco, which is fast and produces very few impurities in the duct to be truncated. The cut edge it produces is also so neat that it does not require after- treatment. Furthermore it is noiseless and safe in operation, and also it is suited in practice to pipes of all sizes.
Before this metal shear can be used, a starting hole must be made in the duct, e.g. by punching with a sheath knife or by drilling. This is of course an extra work phase and nowadays requires a separate tool. Additionally, the use of a sheath knife is often an occupational safety risk.
The purpose of the invention is to achieve a new type of blade of a tool, more particularly a metal shear, with which the aforementioned drawback is avoided. The blade of the tool according to the invention is characterized in that the tip part of the blade is shaped to be sharp such that by means of it a starting hole can be punched in the duct.
One preferred embodiment of the blade according to the invention is characterized in that the tip part of the blade is shaped to curve downwards, in which case it does not impair the actual cutting of the duct.
One advantage of the invention that can be mentioned is that a starting hole can be made in the duct with the same tool with which the actual cutting, e.g. truncation, is performed. This speeds up the procedure, requires fewer tools and also increases occupational safety.
In the following, the invention will be described in more detail by the aid of a preferred embodiment with reference to the attached drawings, wherein
Fig. 1 presents a tool, which is provided with a blade according to the invention.
Fig. 2 presents the blade detached from the tool.
Figs. 3A-3D present the different phases of the use of the tool and its blade.
Fig. 1 thus presents a prior-art metal shear 1 (e.g. a metal shear manufactured by Draco), into which the new type of blade 2 according to the invention is installed in a detachable manner. This type of metal shear can preferably be electrically-operated, containing possibly also a provision for battery powering. The invention is not limited to exactly this shear and to electrical powering, however, but instead other types of cutters are viable, e.g. pneumatically-operated or even manually-operated shears.
The prior art cutting blade in this type of tool is shorter and it comprises an obtuse tip, because the actual cutting is performed with a vertical to-and-fro movement of the blade, in which the grooved upper surface 3 (Fig. 2) together with the adjacent countersurfaces of the tool perform the actual cutting in a manner that is in itself prior art.
In the blade 2 according to the invention this cutting procedure occurs with a fully known method (as described above). The difference to a prior-art blade, however, is the shaping of the tip of the blade. The tip of the blade 2 is elongated and sharp. In addition, it curves preferably downwards, in which case it does not impair the actual cutting. If the blade were straight, the tip would engage the inner surface of the duct when truncating a duct of round cross- sectional shape.
Figs. 3A-3D present the use of the blade according to the invention in a prior-art tool in connection with the cutting of a duct 4. The duct can be a conventional sheet metal ventilation duct. In the first phase (Figs. 3A and 3B) the blade 2 of the tool 1 is punched through the flank of the duct at the desired point for in order to make the starting hole. After this the truncating (cutting) of the duct is performed with the tool, in a manner that is in itself prior-art, by turning the tool to- and-fro as indicated by the arrows (Figs. 3C and 3D) and by pushing the tool forwards as the truncating progresses.
It is obvious to the person skilled in the art that the invention is not limited to the embodiments presented above, but that it can be varied within the scope of the claims presented below. By means of the blade according to the invention it is possible, not only to truncate a ventilation duct at the desired point, but also to cut an inspection hatch or corresponding in it.

Claims

1. Blade (2) of a tool (1) for cutting, e.g. truncating, a duct (4), more particularly a ventilation duct, which blade (2) is fixed to the tool (1) in a detachable manner, characterized in that the tip part of the blade (2) is shaped to be sharp such that by means of it a starting hole can be punched in the duct (4).
2. Blade (2) of a tool (1) according to claim 1, which tool (1) is an electrically-powered metal shear, characterized in that the tip part of the blade (2) is shaped to curve downwards, in which case it does not impair the actual cutting of the duct (4).
EP09742188A 2008-05-07 2009-03-12 Blade of a tool for cutting a duct, more particularly a ventilation duct Withdrawn EP2271467A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20085419A FI121953B (en) 2008-05-07 2008-05-07 A tool blade for cutting a duct, especially a ventilation duct
PCT/FI2009/050195 WO2009135988A1 (en) 2008-05-07 2009-03-12 Blade of a tool for cutting a duct, more particularly a ventilation duct

Publications (2)

Publication Number Publication Date
EP2271467A1 true EP2271467A1 (en) 2011-01-12
EP2271467A4 EP2271467A4 (en) 2011-10-05

Family

ID=39523074

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09742188A Withdrawn EP2271467A4 (en) 2008-05-07 2009-03-12 Blade of a tool for cutting a duct, more particularly a ventilation duct

Country Status (3)

Country Link
EP (1) EP2271467A4 (en)
FI (1) FI121953B (en)
WO (1) WO2009135988A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3086288A (en) * 1955-04-20 1963-04-23 Cavitron Ultrasonics Inc Ultrasonically vibrated cutting knives
DE3210212A1 (en) * 1982-03-19 1983-05-19 Daimler-Benz Ag, 7000 Stuttgart Cutting tool for removing bonded-in window panes
US4891884A (en) * 1987-07-21 1990-01-09 Philip Torbet Hand holdable automatic bladed appliance for slicing, peeling and the like
US5295426A (en) * 1992-06-15 1994-03-22 Planchon Paul O Slot starting sawing method and apparatus
US5421230A (en) * 1993-02-11 1995-06-06 Eliminator Industries Method and apparatus for removing motor vehicle windshields

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2931100A (en) * 1958-02-11 1960-04-05 Wiss & Sons Co J Double cutting shears
US3577638A (en) * 1969-05-01 1971-05-04 Earl Chandler Cutting tool attachment for a power hammer
GB2333734A (en) * 1998-01-28 1999-08-04 Uponor Ltd Pipe preparing tool

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3086288A (en) * 1955-04-20 1963-04-23 Cavitron Ultrasonics Inc Ultrasonically vibrated cutting knives
DE3210212A1 (en) * 1982-03-19 1983-05-19 Daimler-Benz Ag, 7000 Stuttgart Cutting tool for removing bonded-in window panes
US4891884A (en) * 1987-07-21 1990-01-09 Philip Torbet Hand holdable automatic bladed appliance for slicing, peeling and the like
US5295426A (en) * 1992-06-15 1994-03-22 Planchon Paul O Slot starting sawing method and apparatus
US5421230A (en) * 1993-02-11 1995-06-06 Eliminator Industries Method and apparatus for removing motor vehicle windshields

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2009135988A1 *

Also Published As

Publication number Publication date
WO2009135988A1 (en) 2009-11-12
FI121953B (en) 2011-06-30
EP2271467A4 (en) 2011-10-05
FI20085419A0 (en) 2008-05-07
FI20085419A (en) 2009-11-08

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