EP1741508A1 - Kreissägeblatt - Google Patents

Kreissägeblatt Download PDF

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Publication number
EP1741508A1
EP1741508A1 EP05425160A EP05425160A EP1741508A1 EP 1741508 A1 EP1741508 A1 EP 1741508A1 EP 05425160 A EP05425160 A EP 05425160A EP 05425160 A EP05425160 A EP 05425160A EP 1741508 A1 EP1741508 A1 EP 1741508A1
Authority
EP
European Patent Office
Prior art keywords
disc according
disc
teeth
outer circumference
circumference
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Withdrawn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
EP05425160A
Other languages
English (en)
French (fr)
Inventor
Antonio Pallotta
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.)
Speedy Cut Srl
Original Assignee
Speedy Cut Srl
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 Speedy Cut Srl filed Critical Speedy Cut Srl
Priority to EP05425160A priority Critical patent/EP1741508A1/de
Publication of EP1741508A1 publication Critical patent/EP1741508A1/de
Withdrawn legal-status Critical Current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
    • 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
    • B23D61/025—Details of saw blade body

Definitions

  • the present invention relates to a disc for a circular sawing machine, in particular for cutting materials such as wood, plywood, plastic and PVC.
  • a disc of the type specified according to the known art is affected by certain problems.
  • discs having teeth alternately inclined with respect to their side faces are known, but this arrangement causes vibrations and "wobbling" of the disc, making it less controllable and resulting in a less precise cutting action.
  • these discs must have an absolutely equal number of teeth in order for them to function correctly and are also likely to seize during cutting of the material.
  • An object of the invention is to overcome the abovementioned problems and drawbacks of the known art by providing a disc having a reduced frictional contact with the material to be cut, a low degree of overheating and a high cutting precision.
  • the invention relates furthermore to a circular sawing machine according to the accompanying Claim 22.
  • 10 denotes in general a steel disc able to be connected to a circular sawing machine, in particular of the portable type (not shown) and suitable for the cutting of materials such as wood, plywood, plastic and PVC.
  • the disc 10 comprises an inner portion 12 having a central hole 14 intended to be connected to a motor of the sawing machine by means of coupling and transmission means of the type known per se.
  • This disc 10 has along its perimetral portion a peripheral ring 16 provided with six teeth 18a-f having respective cutting edges 20a-f.
  • This peripheral ring 16 is delimited by an outer circumference C1 passing through the cutting edges 20a-f produced by means of incisions 21a-f of substantially circular shape formed between pairs of consecutive teeth 18a-f.
  • the teeth 18a-f need not necessarily be six in number, but their number may preferably range between two and twenty.
  • the outer circumference C1 conveniently has its centre 01 at the centre of rotation O of the disc 10, in this case coinciding with the centre of the hole 14.
  • An intermediate ring 22 is situated between the peripheral ring 16 and the inner portion 12 of the disc 10, and defines an intermediate circumference C2, bordering with the peripheral ring 16, and an inner circumference C3, bordering with the inner portion 12.
  • the outer, intermediate and inner circumferences C1, C2, C3 have their respective centres 01, 02, 03 coinciding with the centre of rotation O of the disc 10, but the abovementioned centres may also be located in positions different from each other in the region defined by the inner portion 12.
  • the intermediate ring 22 has on its surface three openings conveniently in the form of slots 24a-c passing through the side faces of the disc 10 and shaped in the form of circular ring segments having a respective outer edge 26a-c defined by an arc of the intermediate circumference C2 and a respective inner edge 28a-c defined by an arc of the inner circumference C3.
  • These slots are situated around the inner portion 12, advantageously but not necessarily are angularly equidistant on the intermediate ring 22, are substantially equidistant from the centre 01 of the outer circumference C1 and may be of any number and have forms different from those of the slots 24a-c, for example circular or generally polygonal holes.
  • the number of openings or slots may advantageously coincide with the number of teeth.
  • the teeth 18a-f comprise respective tangential flanks 30a-f, which have profiles delimited externally by respective circumferential arcs, of which in Fig. 2 only the circumferential arc A relating to the tangential flank 30b of the tooth 18b is shown.
  • the embodiment shown in Figures 1 and 2 shows the tangential flank 30b with a profile coinciding with the circumferential arc A
  • Figure 3 shows the abovementioned profile formed by two chords subtending said circumferential arc A.
  • the centre K of the circumferential arc A is situated in a region lying between the outer circumference C1 and the diametral axes D1, D2 of the latter passing respectively through the two cutting edges 20a, 20b between which said circumferential arc A is situated.
  • the abovementioned region has been highlighted in Figure 2 by means of oblique lines. This positioning of the centre K results in a form of the tooth 18b which is particularly advantageous in terms of the cutting performance of the disc 10.
  • the tangential flanks 30a-f are shaped as portions of curved sides (interrupted by the incisions 21a-f) of a regular polygon, which in this case is a hexagon, inscribed inside the outer circumference C1 and having the vertices at the angular points consisting of the cutting edges 20a-f of the teeth 18a-f.
  • This configuration makes it possible to perform a particularly precise and efficient cut since the free space lying between the outer circumference C1 and the curvilinear polygonal form generated by the tangential flanks 30a-f reduces friction phenomena, preventing undesirable wobbling of the disc 10.
  • Figure 3 shows an alternative variation of embodiment of the tangential flanks 30a-f of the disc 10.
  • the same reference numbers and letters are associated with elements similar to those described and illustrated in the embodiment previously illustrated in Figures 1 and 2.
  • the tangential flank 30b comprises a leading portion or working chord 32 adjacent to the respective cutting edge 20b of the tooth 18b, and a terminal portion or clearance chord 34 adjacent to the following tooth 18a.
  • the working and clearance chords 32, 24 are consecutive, subtending the arc A, and intersect themselves at an edge 36.
  • the working and clearance portions 32, 34 need not necessarily be straight chords or segments subtending the arc A, but may also have different forms, for example curvilinear forms.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mechanical Operated Clutches (AREA)
EP05425160A 2005-03-18 2005-03-18 Kreissägeblatt Withdrawn EP1741508A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05425160A EP1741508A1 (de) 2005-03-18 2005-03-18 Kreissägeblatt

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05425160A EP1741508A1 (de) 2005-03-18 2005-03-18 Kreissägeblatt

Publications (1)

Publication Number Publication Date
EP1741508A1 true EP1741508A1 (de) 2007-01-10

Family

ID=35197994

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05425160A Withdrawn EP1741508A1 (de) 2005-03-18 2005-03-18 Kreissägeblatt

Country Status (1)

Country Link
EP (1) EP1741508A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021116480A1 (de) 2019-12-13 2021-06-17 Festool Gmbh Vorritzwerkzeug für eine sägemaschine

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE333852C (de) * 1919-08-06 1921-03-04 Karl Weiss Saegeblatt
US1811079A (en) * 1930-03-08 1931-06-23 Forsyth I Roy Saw
US2609017A (en) * 1950-03-13 1952-09-02 E C Atkins And Company Inc Circular saw blade with tension stabilizing holes
DE3305113A1 (de) * 1983-02-15 1984-08-23 Dieter 8472 Schwarzenfeld Gröschke Kreissaegenblatt
DE3804400A1 (de) * 1988-02-12 1989-08-24 Fritz Seeber Vorrichtung zum erzeugen einer mehrzahl von parallelen schnittfugen
US5038653A (en) * 1988-02-02 1991-08-13 The Disston Company Circular saw blade
EP0756912A2 (de) * 1995-08-01 1997-02-05 Jozef Gijsbert Haanschoten Hochgeschwindigkeitshandkreissäge und Kreissägeblatt
WO2000045985A1 (de) * 1999-02-01 2000-08-10 Powertools International Gmbh Sägeblatt mit langlochartigen luftdurchtrittsöffnungen

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE333852C (de) * 1919-08-06 1921-03-04 Karl Weiss Saegeblatt
US1811079A (en) * 1930-03-08 1931-06-23 Forsyth I Roy Saw
US2609017A (en) * 1950-03-13 1952-09-02 E C Atkins And Company Inc Circular saw blade with tension stabilizing holes
DE3305113A1 (de) * 1983-02-15 1984-08-23 Dieter 8472 Schwarzenfeld Gröschke Kreissaegenblatt
US5038653A (en) * 1988-02-02 1991-08-13 The Disston Company Circular saw blade
DE3804400A1 (de) * 1988-02-12 1989-08-24 Fritz Seeber Vorrichtung zum erzeugen einer mehrzahl von parallelen schnittfugen
EP0756912A2 (de) * 1995-08-01 1997-02-05 Jozef Gijsbert Haanschoten Hochgeschwindigkeitshandkreissäge und Kreissägeblatt
WO2000045985A1 (de) * 1999-02-01 2000-08-10 Powertools International Gmbh Sägeblatt mit langlochartigen luftdurchtrittsöffnungen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021116480A1 (de) 2019-12-13 2021-06-17 Festool Gmbh Vorritzwerkzeug für eine sägemaschine
DE102019134413A1 (de) * 2019-12-13 2021-06-17 Festool Gmbh Vorritzwerkzeug für eine Sägemaschine

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