WO2022258164A1 - A saw blade - Google Patents

A saw blade Download PDF

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Publication number
WO2022258164A1
WO2022258164A1 PCT/EP2021/065404 EP2021065404W WO2022258164A1 WO 2022258164 A1 WO2022258164 A1 WO 2022258164A1 EP 2021065404 W EP2021065404 W EP 2021065404W WO 2022258164 A1 WO2022258164 A1 WO 2022258164A1
Authority
WO
WIPO (PCT)
Prior art keywords
teeth
saw blade
metal plate
attached
piece
Prior art date
Application number
PCT/EP2021/065404
Other languages
French (fr)
Inventor
Ronald Arthur Maine ROBINS
Original Assignee
ROBINS, Alanah
ROBINS, Elva
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 ROBINS, Alanah, ROBINS, Elva filed Critical ROBINS, Alanah
Priority to PCT/EP2021/065404 priority Critical patent/WO2022258164A1/en
Publication of WO2022258164A1 publication Critical patent/WO2022258164A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B33/00—Sawing tools for saw mills, sawing machines, or sawing devices
    • B27B33/20—Edge trimming saw blades or tools combined with means to disintegrate waste
    • 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
    • B23D61/026—Composite body, e.g. laminated, body of diverse material
    • 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
    • B23D61/12—Straight saw blades; Strap saw blades
    • B23D61/123—Details of saw blade body
    • B23D61/125—Composite body, e.g. laminated, body of diverse material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B33/00—Sawing tools for saw mills, sawing machines, or sawing devices
    • B27B33/02—Structural design of saw blades or saw teeth

Definitions

  • This invention relates to a saw blade and, in particular, to the arrangement of teeth on a saw blade.
  • Saws and saw blades come in all shapes and sizes. However, as used herein, a saw blade refers to a blade for a bow saw and circular saw blades for use with power drills and the like.
  • a bow saw in this context, refers to a metal-framed crosscut saw in the shape of a bow, which can be used for cross-cutting branches or firewood, up to 150 mm in diameter. It may also be used for ripping suitable timber. This type of saw is also known as a Swede saw, a Finn saw or a bucksaw.
  • the saw blade is a thin, narrow, metal strip with a coarse set of teeth running along one edge, and is held under tension between the ends of the bow-shaped metal frame. A worn saw blade may be easily replaced by a new blade, if required.
  • a bow saw will cut through dry, low density timber, such as deal, with ease.
  • the saw blade can jam in green timber and can be difficult to release.
  • Circular saw blades are available in a variety of designs, to suit a particular application. They are used in a professional setting and also by the Do It Yourself (DIY) user. In this latter setting, use of a power drill, with insufficient power for a particular application may result in jamming of the blade. Also, an underpowered drill can cause the saw to slow down causing excessive friction. This can result in over heating of the blade, which can become distorted or bum the cut surface.
  • the width of the kerf i.e., the slot the blade cuts in the material is an important consideration.
  • the size of the kerf is determined in part by the thickness of the blade, and a solid, reliable blade is one of the features of a good blade. However, the thicker the blade the more power that is required and this is where the DIY user can encounter problems.
  • the invention provides a saw blade comprising a metal plate, a primary set of teeth located on one edge thereof, a first and a second secondary set of teeth attached on opposite sides of the plate and stepped back from the primary set of teeth, such that, in use, the primary set of teeth is first engaged with a piece of material to be sawed followed by engagement of the piece of material with both the first and the second secondary sets of teeth, once the primary set of teeth has made an initial cut in the piece of material.
  • An advantage of the saw blade in accordance with the invention is that, in use, once the first and second secondary sets of teeth engage with the piece of material, the width of the kerf is increased from the initial width of the kerf cut by the primary set of teeth. This increased kerf width, coupled with the fact that three sets of teeth are now cutting into the piece of material, results in a more rapid cutting time with less chance of the saw blade sticking in the piece of material.
  • the first and the second secondary sets of teeth are each attached to the plate by welding means.
  • An advantage of welding as an attachment means for the secondary sets of teeth is that the teeth are securely attached to the metal plate.
  • the welding means is spot welding.
  • the secondary sets of teeth may be fused to the metal plate, and accidental separation of the secondary teeth from the metal plate is minimised.
  • the first and the second secondary sets of teeth are attached to the metal plate by a metal-to-metal adhesive.
  • the width of the metal plate, with the secondary teeth attached can be maintained within a tight tolerance along the length of the saw blade. This results in a balanced saw blade.
  • the plate is a standard bow saw blade.
  • An advantage of the use of secondary sets of teeth on a bow saw blade is that the resultant saw blade is less likely to jam when compared to an unmodified saw blade. Furthermore, by having three sets of teeth the sawing can be completed in less time than when using an unmodified saw blade.
  • plate is a circular saw blade.
  • the first and the second secondary sets of teeth are each respectively attached to a first and second secondary metal plate, which secondary metal plates are concentric with the metal plate.
  • An advantage of the use of secondary metal plates is that the resultant sandwich created by the secondary plates and the metal plate therebetween results in a balanced, modified circular saw blade. Further, preferably, the metal plate and the first and second secondary metal plates are attached together by spot welding. An advantage of spot welding the secondary metal plates to the metal plate is that the resultant modified circular saw blade, is strong and so is unlikely to fail in use.
  • the metal plate and the first and second secondary metal plates are attached together by adhesive means.
  • An advantage of the use of adhesive means to attach the secondary plates to the metal plate is that a uniform thickness of the resultant modified blade can be assured.
  • a surface of the first and second secondary metal plates has an abrasive band on the surface thereof inside the location of the first and the second, secondary set of teeth.
  • Fig. 1 is a view from one side of a saw blade for a bow saw in accordance with the invention
  • Fig. 2 is a view from one side of a saw blade for a circular saw in accordance with the invention.
  • a saw blade in accordance with the invention which saw blade 10 is for use in a bow saw (not shown).
  • the saw blade 10 comprises a metal plate 11 with a primary set of teeth 12 located on one edge 13 thereof.
  • a first secondary set of teeth 14 is attached to one side 15 of the metal plate 11, with the first secondary set of teeth 14 being stepped back from the primary set of teeth 12.
  • a second secondary set of teeth (not shown) is attached to the opposite side 16 of the metal plate 11, with the second secondary set of teeth being similarly positioned on the opposite side 16 as in the case of the positioning of the first secondary set of teeth 14 on side 15 of the metal plate 11.
  • the first 14 and a second (not shown), secondary sets of teeth are attached to the respective sides 15, 16 of the metal plate 11 by spot welding.
  • the primary set of teeth 12 is first engaged with a piece of material (not shown) to be sawed followed by engagement of the piece of material with both the first 14 and the second (not shown), secondary set of teeth, once the primary set of teeth 12 have made an initial cut in the piece of material.
  • a saw blade 29 in accordance with the invention, which saw blade 20 is for use as a circular saw.
  • the saw blade 20 comprises a circular metal plate 21 with a primary set of teeth 22 located on the periphery 23 thereof.
  • a first secondary set of teeth 24 is attached to a first secondary metal plate 25, at the periphery 26 thereof, which first secondary set of teeth 24 is stepped back from the primary set of teeth 22.
  • the metal plate 21 and the first secondary metal plate 25 are attached together by spot welding.
  • An abrasive band 27 is located on side 29 of the first secondary metal plate 25.
  • a second secondary metal plate (not shown) is attached to the opposite side 30 of the metal plate 21 by spot welding.
  • the second secondary metal plate has a second secondary set of teeth (not shown) attached at the periphery thereof, together with an abrasive band located on the second secondary metal plate at an equivalent position to band 27 on the first secondary metal plate 25.
  • the saw blade 20 has three sets of teeth, with the primary set of teeth 22 sandwiched between the first 24 and second secondary sets of teeth.
  • the primary set of teeth 22 is first engaged with a piece of material (not shown) to be sawed followed by engagement of the piece of material with both the first 24 and the second (not shown), secondary set of teeth, once the primary set of teeth 22 has made an initial cut in the piece of material.
  • the abrasive bands to each side of the saw blade 20 smoothen down the edges of the cut.

Abstract

A saw blade (10), for use in a bow saw (not shown), comprises a metal plate (11) with a primary set of teeth (12) located on one edge (13) thereof. A first secondary set of teeth (14) is attached to one side 15 of the metal plate (11), with the first secondary set of teeth (14) being stepped back from the primary set of teeth (12). A second secondary set of teeth (not shown) is attached to the opposite side (16) of the metal plate (11), with the second secondary set of teeth being similarly positioned on the opposite side (16) as in the case of the positioning of the first secondary set of teeth (14) on side (15) of the metal plate (11). In use, the primary set of teeth (12) is first engaged with a piece of material (not shown) to be sawed followed by engagement of the piece of material with both the first (14) and the second (not shown), secondary set of teeth, once the primary set of teeth (12) have made an initial cut in the piece of material.

Description

A saw blade
Technical Field
This invention relates to a saw blade and, in particular, to the arrangement of teeth on a saw blade. Background Art
Saws and saw blades come in all shapes and sizes. However, as used herein, a saw blade refers to a blade for a bow saw and circular saw blades for use with power drills and the like.
A bow saw, in this context, refers to a metal-framed crosscut saw in the shape of a bow, which can be used for cross-cutting branches or firewood, up to 150 mm in diameter. It may also be used for ripping suitable timber. This type of saw is also known as a Swede saw, a Finn saw or a bucksaw. The saw blade is a thin, narrow, metal strip with a coarse set of teeth running along one edge, and is held under tension between the ends of the bow-shaped metal frame. A worn saw blade may be easily replaced by a new blade, if required.
A bow saw will cut through dry, low density timber, such as deal, with ease. However, the saw blade can jam in green timber and can be difficult to release. Circular saw blades are available in a variety of designs, to suit a particular application. They are used in a professional setting and also by the Do It Yourself (DIY) user. In this latter setting, use of a power drill, with insufficient power for a particular application may result in jamming of the blade. Also, an underpowered drill can cause the saw to slow down causing excessive friction. This can result in over heating of the blade, which can become distorted or bum the cut surface.
The width of the kerf i.e., the slot the blade cuts in the material is an important consideration. The size of the kerf is determined in part by the thickness of the blade, and a solid, reliable blade is one of the features of a good blade. However, the thicker the blade the more power that is required and this is where the DIY user can encounter problems.
It is an object of the present invention to overcome the disadvantages of the saw blades hereinbefore described.
Disclosure of Invention
Thus, the invention provides a saw blade comprising a metal plate, a primary set of teeth located on one edge thereof, a first and a second secondary set of teeth attached on opposite sides of the plate and stepped back from the primary set of teeth, such that, in use, the primary set of teeth is first engaged with a piece of material to be sawed followed by engagement of the piece of material with both the first and the second secondary sets of teeth, once the primary set of teeth has made an initial cut in the piece of material.
An advantage of the saw blade in accordance with the invention is that, in use, once the first and second secondary sets of teeth engage with the piece of material, the width of the kerf is increased from the initial width of the kerf cut by the primary set of teeth. This increased kerf width, coupled with the fact that three sets of teeth are now cutting into the piece of material, results in a more rapid cutting time with less chance of the saw blade sticking in the piece of material.
Preferably, the first and the second secondary sets of teeth are each attached to the plate by welding means.
An advantage of welding as an attachment means for the secondary sets of teeth is that the teeth are securely attached to the metal plate.
Further, preferably, the welding means is spot welding.
An advantage of using spot welding is that the secondary sets of teeth may be fused to the metal plate, and accidental separation of the secondary teeth from the metal plate is minimised. Alternatively, the first and the second secondary sets of teeth are attached to the metal plate by a metal-to-metal adhesive.
An advantage of the use of a suitable metal-to-metal adhesive is that the width of the metal plate, with the secondary teeth attached, can be maintained within a tight tolerance along the length of the saw blade. This results in a balanced saw blade. In one embodiment of the saw blade in accordance with the invention, the plate is a standard bow saw blade.
An advantage of the use of secondary sets of teeth on a bow saw blade is that the resultant saw blade is less likely to jam when compared to an unmodified saw blade. Furthermore, by having three sets of teeth the sawing can be completed in less time than when using an unmodified saw blade.
In a further embodiment of the saw blade in accordance with the invention, plate is a circular saw blade. An advantage of adding secondary sets of teeth to a circular saw blade is that the saw blade will cut through a piece of material in less time than when using an unmodified circular saw blade and there is less tendency for the blade to slow down due to the increase kerf width.
Preferably, the first and the second secondary sets of teeth are each respectively attached to a first and second secondary metal plate, which secondary metal plates are concentric with the metal plate.
An advantage of the use of secondary metal plates is that the resultant sandwich created by the secondary plates and the metal plate therebetween results in a balanced, modified circular saw blade. Further, preferably, the metal plate and the first and second secondary metal plates are attached together by spot welding. An advantage of spot welding the secondary metal plates to the metal plate is that the resultant modified circular saw blade, is strong and so is unlikely to fail in use.
Alternatively, the metal plate and the first and second secondary metal plates are attached together by adhesive means.
An advantage of the use of adhesive means to attach the secondary plates to the metal plate is that a uniform thickness of the resultant modified blade can be assured.
Suitably, a surface of the first and second secondary metal plates has an abrasive band on the surface thereof inside the location of the first and the second, secondary set of teeth.
An advantage of the inclusion of an abrasive band on the secondary plates is that the abrasive action will tend to smoothen the edges of the cut as the saw blade passes through a material piece. The invention will be further illustrated by the following description of embodiments thereof, given by way of example only with reference to the accompanying drawings in which:
Brief Description of Drawings
Fig. 1 is a view from one side of a saw blade for a bow saw in accordance with the invention; and Fig. 2 is a view from one side of a saw blade for a circular saw in accordance with the invention.
Best Mode for Carrying out the Invention
Referring to Fig.l, there is illustrated generally at 10, a saw blade in accordance with the invention, which saw blade 10 is for use in a bow saw (not shown). The saw blade 10 comprises a metal plate 11 with a primary set of teeth 12 located on one edge 13 thereof. A first secondary set of teeth 14 is attached to one side 15 of the metal plate 11, with the first secondary set of teeth 14 being stepped back from the primary set of teeth 12.
A second secondary set of teeth (not shown) is attached to the opposite side 16 of the metal plate 11, with the second secondary set of teeth being similarly positioned on the opposite side 16 as in the case of the positioning of the first secondary set of teeth 14 on side 15 of the metal plate 11.
The first 14 and a second (not shown), secondary sets of teeth are attached to the respective sides 15, 16 of the metal plate 11 by spot welding.
In use, the primary set of teeth 12 is first engaged with a piece of material (not shown) to be sawed followed by engagement of the piece of material with both the first 14 and the second (not shown), secondary set of teeth, once the primary set of teeth 12 have made an initial cut in the piece of material. Referring to Fig. 2, there is illustrated generally at 20, a further embodiment of a saw blade 29 in accordance with the invention, which saw blade 20 is for use as a circular saw. The saw blade 20 comprises a circular metal plate 21 with a primary set of teeth 22 located on the periphery 23 thereof. A first secondary set of teeth 24 is attached to a first secondary metal plate 25, at the periphery 26 thereof, which first secondary set of teeth 24 is stepped back from the primary set of teeth 22. The metal plate 21 and the first secondary metal plate 25 are attached together by spot welding. An abrasive band 27 is located on side 29 of the first secondary metal plate 25.
In a similar fashion, a second secondary metal plate (not shown) is attached to the opposite side 30 of the metal plate 21 by spot welding. The second secondary metal plate has a second secondary set of teeth (not shown) attached at the periphery thereof, together with an abrasive band located on the second secondary metal plate at an equivalent position to band 27 on the first secondary metal plate 25.
Thus, the saw blade 20 has three sets of teeth, with the primary set of teeth 22 sandwiched between the first 24 and second secondary sets of teeth. In use, the primary set of teeth 22 is first engaged with a piece of material (not shown) to be sawed followed by engagement of the piece of material with both the first 24 and the second (not shown), secondary set of teeth, once the primary set of teeth 22 has made an initial cut in the piece of material. As the saw blade 20 cuts further into the piece of material, the abrasive bands to each side of the saw blade 20 smoothen down the edges of the cut.

Claims

Claims: -
1. A saw blade comprising a metal plate, a primary set of teeth located on one edge thereof, a first and a second secondary set of teeth attached on opposite sides of the plate and stepped back from the primary set of teeth, such that, in use, the primary set of teeth is first engaged with a piece of material to be sawed followed by engagement of the piece of material with both the first and the second secondary sets of teeth, once the primary set of teeth has made an initial cut in the piece of material.
2. A saw blade according to Claim 1, wherein the first and the second secondary sets of teeth are each attached to the plate by welding means.
3. A saw blade according to Claim 2, wherein the welding means is spot welding.
4. A saw blade according to Claim 1 , wherein the first and the second secondary sets of teeth are attached to the metal plate by a metal- to-metal adhesive.
5. A saw blade according to any preceding claim, wherein the metal plate is a standard bow saw blade.
6. A saw blade according to any one of Claims 1 to 4, wherein plate is a circular saw blade.
7. A saw blade according to Claim 6, wherein the first and the second secondary sets of teeth are each respectively attached to a first and second secondary metal plate, which secondary metal plates are concentric with the metal plate.
8. A saw blade according to Claim 7, wherein the metal plate and the first and second secondary metal plates are attached together by spot welding.
9. A saw blade according to Claim 7, wherein the metal plate and the first and second secondary metal plates are attached together by adhesive means.
10. A saw blade according to any one of Claims 6 to 9, wherein a surface of the first and second secondary metal plates has an abrasive band on the surface thereof inside the location of the first and the second, secondary set of teeth.
PCT/EP2021/065404 2021-06-09 2021-06-09 A saw blade WO2022258164A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2021/065404 WO2022258164A1 (en) 2021-06-09 2021-06-09 A saw blade

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2021/065404 WO2022258164A1 (en) 2021-06-09 2021-06-09 A saw blade

Publications (1)

Publication Number Publication Date
WO2022258164A1 true WO2022258164A1 (en) 2022-12-15

Family

ID=76444402

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2021/065404 WO2022258164A1 (en) 2021-06-09 2021-06-09 A saw blade

Country Status (1)

Country Link
WO (1) WO2022258164A1 (en)

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1269653A (en) * 1915-09-03 1918-06-18 James C Smith Cutting and abrasive implement.
US2524323A (en) * 1947-02-21 1950-10-03 Carysfort F Lloyd-Young Cutting and sanding device
JPS50156784A (en) * 1974-06-11 1975-12-18
DE3039063A1 (en) * 1980-10-16 1982-05-19 Herbert 8951 Baisweil Heintel Wood cutting saw blade - has abrasive sheets attached to sides to eliminate rough edges after sawing
DE29900253U1 (en) * 1999-01-12 1999-10-21 Jansen Herfeld Roettger Circular saw blade with double-sided toothed rings and the same saw thickness within the toothed ring surfaces
DE19900864A1 (en) * 1999-01-12 2000-07-13 Jansen Herfeld Roettger Circular saw blade has additional concentric toothed rings adjoining flush with saw blade and having on outer faces a radial free angle
DE19948518A1 (en) * 1999-10-08 2001-04-12 Holzma Maschb Gmbh Sawing device for simultaneous cutting of several plywood sheets or chip boards, comprising arrangement of two saw blades
DE102005005001A1 (en) * 2005-02-03 2006-08-10 Rick Jansen-Herfeld Circular saw blade has at least one concentric side support ring which is connected to saw blade in such way that installed on at least one contour diameter of support ring is tapering tongue consisting of steel of support ring
DE102005048084A1 (en) * 2005-08-03 2007-03-15 Rick Jansen-Herfeld Circular saw blade, has reinforcement ring provided on side and comprising intermediate and outer rings that are connected with one another using welding spots, where intermediate ring is connected with blade by using other welding spots
JP2007245289A (en) * 2006-03-16 2007-09-27 Shigenari Shirasaki Cutter
GB2436540A (en) * 2006-03-31 2007-10-03 Patrick James Thornton Cutting and chamfering device

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1269653A (en) * 1915-09-03 1918-06-18 James C Smith Cutting and abrasive implement.
US2524323A (en) * 1947-02-21 1950-10-03 Carysfort F Lloyd-Young Cutting and sanding device
JPS50156784A (en) * 1974-06-11 1975-12-18
DE3039063A1 (en) * 1980-10-16 1982-05-19 Herbert 8951 Baisweil Heintel Wood cutting saw blade - has abrasive sheets attached to sides to eliminate rough edges after sawing
DE29900253U1 (en) * 1999-01-12 1999-10-21 Jansen Herfeld Roettger Circular saw blade with double-sided toothed rings and the same saw thickness within the toothed ring surfaces
DE19900864A1 (en) * 1999-01-12 2000-07-13 Jansen Herfeld Roettger Circular saw blade has additional concentric toothed rings adjoining flush with saw blade and having on outer faces a radial free angle
DE19948518A1 (en) * 1999-10-08 2001-04-12 Holzma Maschb Gmbh Sawing device for simultaneous cutting of several plywood sheets or chip boards, comprising arrangement of two saw blades
DE102005005001A1 (en) * 2005-02-03 2006-08-10 Rick Jansen-Herfeld Circular saw blade has at least one concentric side support ring which is connected to saw blade in such way that installed on at least one contour diameter of support ring is tapering tongue consisting of steel of support ring
DE102005048084A1 (en) * 2005-08-03 2007-03-15 Rick Jansen-Herfeld Circular saw blade, has reinforcement ring provided on side and comprising intermediate and outer rings that are connected with one another using welding spots, where intermediate ring is connected with blade by using other welding spots
JP2007245289A (en) * 2006-03-16 2007-09-27 Shigenari Shirasaki Cutter
GB2436540A (en) * 2006-03-31 2007-10-03 Patrick James Thornton Cutting and chamfering device

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