EP0478237A1 - Sägeblätter mit unterschiedlichen Zähnen - Google Patents

Sägeblätter mit unterschiedlichen Zähnen Download PDF

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Publication number
EP0478237A1
EP0478237A1 EP91308590A EP91308590A EP0478237A1 EP 0478237 A1 EP0478237 A1 EP 0478237A1 EP 91308590 A EP91308590 A EP 91308590A EP 91308590 A EP91308590 A EP 91308590A EP 0478237 A1 EP0478237 A1 EP 0478237A1
Authority
EP
European Patent Office
Prior art keywords
tooth
teeth
pitch
group
saw blade
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.)
Granted
Application number
EP91308590A
Other languages
English (en)
French (fr)
Other versions
EP0478237B1 (de
Inventor
Hiram Brocklehurst
Michael James Mulroy
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.)
Black and Decker Inc
Original Assignee
Black and Decker Inc
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 Black and Decker Inc filed Critical Black and Decker Inc
Priority to AT9191308590T priority Critical patent/ATE104887T1/de
Publication of EP0478237A1 publication Critical patent/EP0478237A1/de
Application granted granted Critical
Publication of EP0478237B1 publication Critical patent/EP0478237B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
    • B23D61/02—Circular saw blades
    • B23D61/021—Types of set; Variable teeth, e.g. variable in height or gullet depth; Varying pitch; Details of gullet

Definitions

  • the present invention relates to saw blades, particularly to circular saw blades, having variable tooth size and arrangement.
  • each tooth was of the same size. For some purposes, however, teeth of more than one size would be used, the teeth of each particular size being uniformly spaced around the circumference of the blade.
  • US Patent 105261 (Shailer) discloses a circular saw having alternate long and short teeth characterised in that the shorter teeth are bent further out than the longer. Even in 1870, the date of this patent, claim was only made to this specific arrangement and by disclaimer it was indicated that the variable-tooth saw was already well-known. Over the years there have been many proposals (some adopted) for vari-toothed saw blades, ranging from patterns of alternating teeth to extremely complex arrangements of groups of teeth, where great merit has been claimed for circular saws with even numbers of tooth groups (or alternatively for odd numbers of groups! as well as for all possible variations of numbers of teeth in a group. Thus the alternating teeth of US 105261 (Shailer) can be compared with the alternating groups of teeth of US 352867 (Greist).
  • One principal aim of vari-toothed saw arrangement is to optimise the compromise between cutting effectiveness and energy efficiency, and this is one object of the present invention.
  • the so-called combination saw for woodwork is an attempt to combine the performance of rip-saw and cross-cut-saw in a single tool.
  • a circular saw blade with cutting teeth provided in a plurality of circumferential groups is characterised in that the pitch of successive teeth first reduces and then increases in each group.
  • each group comprises at least four teeth so that the pitch of the second tooth is less than that of the first, the pitch of the third tooth is less than that of the second, and the pitch of the fourth tooth is greater than that of the third.
  • the pitch of the second tooth may be equal to that of the fourth.
  • Each tooth is associated with a gullet which precedes the tooth in the direction of cut and serves to provide the space required for the operation of the tooth, including the egress of cutting debris from the cut.
  • a gullet which precedes the tooth in the direction of cut and serves to provide the space required for the operation of the tooth, including the egress of cutting debris from the cut.
  • the performance of saw blades in accordance with the present invention is enhanced by the provision of hard-material reinforcement to each tooth, preferably by the use of tungsten carbide tips.
  • the figure shows a combination saw blade in accordance with the invention.
  • Saw blade 1 has an overall diameter of 190.5 mm and is provided with a bore 2 30.02 mm in diameter. 20 teeth 3 are spaced round blade 1 in five identical groups, each of four teeth. A tungsten carbide tip 4 is brazed to each tooth 3. In each group, the second tooth 6 is 21° from first tooth 5, the third tooth 7 is 18° from second tooth 6, the fourth tooth 8 is 15° from third tooth 7 and the first tooth 5 of the succeeding group 18° from fourth tooth 8.
  • each tooth is directly related to the pitch of the respective tooth so that the bottom of gullet 9 is at a radius of 78.0 mm from the centre, the bottom of gullet 10 at a radius of 80.5 mm, the bottom of gullet 11 at a radius of 83.0 mm and the bottom of gullet 12 at a radius of 80.5 mm.
  • Each group of teeth is separated by a clearance slot 13 2 mm wide and extending to a radius of 70.4 mm. All the teeth 3 are on the same radius, have a rake angle of 20° and a clearance angle of 10°.
  • the illustrated embodiment of the present invention is devised as a combination cross-cut/rip saw for wood but such a saw can be effectively used on non-ferrous metals such as extrusions and castings of aluminium or copper or alloys of these and similar metals.
  • the variation of pitch between teeth in each group gives corresponding variation of chip size (amount of material taken by the relevant tooth) and thus to the extent of swarf removal and cleanness of the cut.
  • This variation eases the load on the saw blade and reduces noise and vibration and leads to a lower power requirement.
  • This provides a greater flexibility of feed rate, readily accommodating different materials.
  • a cleaner cut than is found with conventional combination saws is obtained which leads to an improved finish.
  • Operational speeds up to 15% higher than with conventional combination saws can readily be achieved using the saw of the invention.
  • the present invention is especially suitable for saws of 180-400 mm diameter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sawing (AREA)
  • Scissors And Nippers (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Toilet Supplies (AREA)
  • Road Repair (AREA)
  • Harvester Elements (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP91308590A 1990-09-28 1991-09-20 Sägeblätter mit unterschiedlichen Zähnen Expired - Lifetime EP0478237B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT9191308590T ATE104887T1 (de) 1990-09-28 1991-09-20 Saegeblaetter mit unterschiedlichen zaehnen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB909021131A GB9021131D0 (en) 1990-09-28 1990-09-28 Variable-tooth saw blades
GB9021131 1990-09-28

Publications (2)

Publication Number Publication Date
EP0478237A1 true EP0478237A1 (de) 1992-04-01
EP0478237B1 EP0478237B1 (de) 1994-04-27

Family

ID=10682902

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91308590A Expired - Lifetime EP0478237B1 (de) 1990-09-28 1991-09-20 Sägeblätter mit unterschiedlichen Zähnen

Country Status (6)

Country Link
EP (1) EP0478237B1 (de)
AT (1) ATE104887T1 (de)
CA (1) CA2052019C (de)
DE (1) DE69101820T2 (de)
GB (1) GB9021131D0 (de)
NZ (1) NZ239919A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1700661A1 (de) * 2005-03-08 2006-09-13 XylaTec GmbH Kreissägeblatt
FR2886194A1 (fr) * 2005-05-24 2006-12-01 Perigord Affutage Sarl Lame de scie
US7225715B2 (en) * 2002-03-19 2007-06-05 Black & Decker Inc. Variable tooth saw blade
WO2012038597A1 (en) * 2010-09-21 2012-03-29 Ttt Technology Oy Ab Canter-edger saw blade, blade element and blade unit
CN106041208A (zh) * 2015-04-02 2016-10-26 莱茨两合公司 具有成组齿部的圆锯片
SE1850095A1 (en) * 2018-01-29 2019-07-30 Husqvarna Ab Differential pitch clearing saw blade and clearing saw

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO45267A (de) *
US2568870A (en) * 1945-10-31 1951-09-25 Lerned F Ronan Saw
EP0009036A1 (de) * 1978-08-28 1980-03-19 Capewell Manufacturing Company Sägeblatt mit unterschiedlichen Zähnen
US4311075A (en) * 1978-01-12 1982-01-19 Sanvik Aktiebolag Cutting tool
GB2214866A (en) * 1988-02-02 1989-09-13 Disston Co Circular saw blade

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO45267A (de) *
US2568870A (en) * 1945-10-31 1951-09-25 Lerned F Ronan Saw
US4311075A (en) * 1978-01-12 1982-01-19 Sanvik Aktiebolag Cutting tool
EP0009036A1 (de) * 1978-08-28 1980-03-19 Capewell Manufacturing Company Sägeblatt mit unterschiedlichen Zähnen
GB2214866A (en) * 1988-02-02 1989-09-13 Disston Co Circular saw blade

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
THE OFFICIAL GAZETTE OF THE UNITED STATES PATENTOFFICE vol. 6, no. 19, 10 November 1874, WASHINGTON (US) page 668; *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7225715B2 (en) * 2002-03-19 2007-06-05 Black & Decker Inc. Variable tooth saw blade
EP1700661A1 (de) * 2005-03-08 2006-09-13 XylaTec GmbH Kreissägeblatt
FR2886194A1 (fr) * 2005-05-24 2006-12-01 Perigord Affutage Sarl Lame de scie
WO2012038597A1 (en) * 2010-09-21 2012-03-29 Ttt Technology Oy Ab Canter-edger saw blade, blade element and blade unit
CN106041208A (zh) * 2015-04-02 2016-10-26 莱茨两合公司 具有成组齿部的圆锯片
CN106041208B (zh) * 2015-04-02 2020-02-07 莱茨两合公司 具有成组齿部的圆锯片
SE1850095A1 (en) * 2018-01-29 2019-07-30 Husqvarna Ab Differential pitch clearing saw blade and clearing saw

Also Published As

Publication number Publication date
CA2052019C (en) 2003-09-16
ATE104887T1 (de) 1994-05-15
NZ239919A (en) 1993-04-28
DE69101820D1 (de) 1994-06-01
DE69101820T2 (de) 1994-08-11
CA2052019A1 (en) 1992-03-29
GB9021131D0 (en) 1990-11-14
EP0478237B1 (de) 1994-04-27

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