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WO2008143609A1 - Appareil de coupe circulaire - Google Patents

Appareil de coupe circulaire Download PDF

Info

Publication number
WO2008143609A1
WO2008143609A1 PCT/US2007/011739 US2007011739W WO2008143609A1 WO 2008143609 A1 WO2008143609 A1 WO 2008143609A1 US 2007011739 W US2007011739 W US 2007011739W WO 2008143609 A1 WO2008143609 A1 WO 2008143609A1
Authority
WO
WIPO (PCT)
Prior art keywords
circular saw
saw blade
blade
central portion
angle
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.)
Ceased
Application number
PCT/US2007/011739
Other languages
English (en)
Inventor
Barbara Cotten Robinson
Jeffrey S. Robinson
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to PCT/US2007/011739 priority Critical patent/WO2008143609A1/fr
Publication of WO2008143609A1 publication Critical patent/WO2008143609A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B23D61/025—Details of saw blade body

Definitions

  • the present invention relates generally to a circular cutting blade and more specifically to a circular saw blade suitable for use in conjunction with a wide variety of conventional circular power saws, such as a handheld circular saw or table saw.
  • the invention facilitates the cutting of arcuate shapes in generally planar material while minimizing blade rubbing and binding against the material as well as minimizing sanding or filing of the remaining material edges once the cut has been completed. DESCRIPTION OF THE RELATED ART
  • U.S. Patent No. 4,602,434 to Stradling discloses a circular cutting device that provides a circular saw blade that is concave in cross-section that permits an operator to cut arcuate or circular holes in materials.
  • the invention disclosed in the '434 patent provides for circular saw blades having differing degrees of concavity for cutting circles or arcs of differing diameters.
  • prior art concave blades are incapable of making circular cuts in more than one direction since the overall concave shape of the blade forces the rotating saw blade either to the left or right through the material, depending upon the direction of the concavity and the directional arrangement of the cutting blade tips disposed on the periphery of the blade.
  • This inherent limitation of prior art blades requires the manufacture of both a left hand and right hand cutting blade in order to cut right and left arcs in a surface, along with the necessity to either change out blades on the saw, or to have two saws available for circular cutting tasks at all times.
  • the present invention obviates the aforementioned problems by providing a generally circular cutting blade suitable for use in a conventional circular saws or equivalent power tools such as table saws and the like.
  • the circular blade of the invention is readily secured to a conventional arbor shaft capable of rotation, as is the common mechanical method for securing a circular saw blade to a conventional circular saw.
  • the cutting blade of the present invention utilizes a pair of angled or concave portions or segments (as viewed from one side of the blade). A first portion is located at the radially outward periphery of the blade and a second portion is disposed radially inwardly therefrom. These first and second angled or concave portions are connected by a relatively flat blade portion that permits the radially outward surface to flex slightly from side to side as the blade is rotated through a work piece.
  • the invention further incorporates a plurality of conventional shaped blade cutting tips arranged around the perimeter of the blade, in order to facilitate the rotation of the blade through the material being cut. The cutting tips are designed to cut a kerf in the work piece that is sufficiently wide to enable the blade to rotate freely through the kerf, even as it is being turned by an operator to cut an arcuate shape.
  • the present invention provides a circular cutting blade that permits an operator to cut right or left arcs in a planar material as the outer portion of the blade rotates through the material and flexes as the blade is directed in a leftward or rightward arc.
  • Fig. 1 is a side view of a cutting blade in accordance with one embodiment of the present invention.
  • Fig. 2 is a cross-sectional view of the cutting blade of Fig. 1 taken along the line 2-2 in accordance with one embodiment of the present invention.
  • FIG. 3 is an exaggerated scale cross sectional view of a cutting blade in accordance with one embodiment of the present invention.
  • FIG. 4 is an exaggerated scale cross sectional view of a cutting blade in accordance with one embodiment of the present invention.
  • FIG. 5 is an exaggerated scale cross-section view of a cutting blade in accordance with one embodiment of the present invention.
  • a generally circular cutting blade 10 suitable for use in a conventional circular saw or like power tool to cut arcuate kerfs therein comprises a central aperture 12 located at the center of blade 10 capable of receiving an arbor of a circular saw to secure the saw blade to an arbor shaft, which provides a means of rotation for the blade 10.
  • FIG. 10 comprises an outer concave or angled portion 20 that includes cutting teeth 14 spaced at regular intervals along a radially outer edge 22 thereof.
  • Fig. 3 depicts an exaggerated scale cross-sectional view of blade 10 including geometric markings, wherein the shapes of the various portions of blade 10 are exaggerated for purposes of clarity, and wherein the concavity or angle of portion 20 is more readily seen.
  • Outer portion 20 terminates into and is connected to central portion 30, which is generally circular and disposed radially inwardly of outer portion 20 on blade 10.
  • central portion 30 is generally fiat across its diameter, denoted as dimension B in Fig. 3.
  • Central portion 30 may be oriented to be substantially perpendicular to an axis running through central aperture 12. As best seen in Fig. 2, when blade 10 is laid flat against a generally planar surface 1, such as a table top, and is oriented such that cutting teeth 14 are not in contact with surface 1, central portion 30 is in contact with surface 1 along a substantial portion of its width B.
  • blade 10 includes a blade center section 50 that extends from a radially inward edge 42 of inner portion 40 inwardly towards central aperture 12.
  • outer portion 20 and inner portion 40 may be alternatively concave or relatively flat but oriented at an angle with respect to central portion 30 without departing from the scope of the present invention.
  • a cross-sectional profile of portion 20 and portion 40 may be arcuate or parabolic, as best seen in Figs. 2 and 5.
  • the improved cutting blade 10 of the present invention comprises at least three portions: an outer portion 20 that is radially located outermost from aperture 12 and is either concave in shape or oriented at an angle with respect to central portion 30, a central portion 30 that is disposed radially inwardly of outer portion 20, and an inner portion 40 that is disposed radially inwardly of central portion 30 and is either concave in shape or oriented at an angle with respect to central portion 30.
  • the innermost portion of blade 10 may include center section 50, through which aperture 12 is disposed for affixing blade 10 to a saw.
  • cutting tips 16 may have a width slightly wider than conventional tips to provide for enhanced kerf width. This feature of the present invention permits the outer and inner portions, 20 and 40, of the cutting blade to rotate through the kerf produced by the rotating blade relatively unimpeded, which reduces the binding and overheating common in conventional saw blades when cutting circular kerfs. It also facilitates the cutting of right or left arcuate shapes.
  • FIG. 3 depicts an exaggerated scale cross-sectional view of blade 10 in order to more accurately display the various shapes of the portions of blade 10 and their relationships to each other.
  • outer concave surface 20 extends from its radially outward point a to radially inward point b.
  • central portion 30 extends from its radially outward point b to its radially inward point c
  • inner concave portion 40 extends from its radially outward point c to its radially inward point d.
  • the line segment A denotes the hypotenuse of a triangle made by the vertical distance X between surface 1 and point a, line segment A, and the horizontal distance between points a and b along surface 1.
  • the line segment B simply denotes the length or width of central portion 30.
  • the line segment C denotes the hypotenuse of a triangle made by the vertical distance Y between surface 1 and point d, line segment C, and the horizontal distance between points c and d along surface 1.
  • the angle ⁇ denotes the angle made by line A and surface 1.
  • the angle ⁇ denotes the angle made by line C and surface 1.
  • blades 10 may be manufactured having an angle ⁇ that may be in a range from about 11.9 degrees to about 2.75 degrees. Additionally, the angle ⁇ may be in a range from about 20 degrees to about 7 degrees.
  • X which is the distance from the surface on which the blade is laid (or the distance from one side of the width of the blade) to the cutting teeth 14 is less than dimension Y, which is the distance from one side of the width of the blade to center section 50 through which aperture 12 is disposed.
  • Y which is the distance from one side of the width of the blade to center section 50 through which aperture 12 is disposed.
  • the dimension X which is the distance from the surface on which the blade is laid (or the distance from one side of the width of the blade) to the cutting teeth 14 is greater than dimension Y, which is the distance from one side of the width of the blade to the surface through which aperture 12 is disposed.
  • the cutting teeth 14 are more elevated from surface 1 when blade 10 is laid thereon than center section 50 of blade 10 in which aperture 12 is disposed.
  • the vertical distance between the radially outermost point a of said outer section and said central section is greater than the vertical distance between the radially innermost point d of said inner section and said central section.
  • Fig. 5 depicts a cross-sectional exaggerated scale view of a blade in accordance with another embodiment of the invention wherein outer portion 20 and inner portion 40 are both shown as concave in shape and connected by a relatively flat central portion 30.
  • outer portion 20 readily cuts an arcuate kerf in the work piece, depending upon its degree and direction of concavity or its angle relative to central portion 30. Additionally, the arrangement of inner and outer concave portions 20 and 40 respectively, connected by flat portion 30, permits outer section 20 to cut away from the direction of concavity (or surface angle) so that blade 10 is capable of cutting left or right arcuate shapes in material without changing cutting directions or blades.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sawing (AREA)

Abstract

La présente invention concerne une lame de coupe généralement circulaire (10) qui convient pour une utilisation sur des scies circulaires classiques ou des outils électriques équivalents, tels que des scies circulaires à table et similaires. La lame de coupe (10) de la présente invention utilise une paire de parties ou segments concaves ou inclinés (comme vu depuis un côté de la lame). Une première partie (20) est située à la périphérie radialement extérieure de la lame (10) et une seconde partie (40) est disposée radialement vers l'intérieur de celle-ci. Ces première et seconde parties inclinées ou concaves (20, 40) sont reliées par une partie de lame relativement plate (30) qui permet à la partie radialement vers l'extérieur (20) de fléchir ou dévier légèrement d'un côté à l'autre à mesure que la lame (10) est entraînée en rotation à travers une pièce à travailler.
PCT/US2007/011739 2007-05-16 2007-05-16 Appareil de coupe circulaire Ceased WO2008143609A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US2007/011739 WO2008143609A1 (fr) 2007-05-16 2007-05-16 Appareil de coupe circulaire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2007/011739 WO2008143609A1 (fr) 2007-05-16 2007-05-16 Appareil de coupe circulaire

Publications (1)

Publication Number Publication Date
WO2008143609A1 true WO2008143609A1 (fr) 2008-11-27

Family

ID=39800602

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2007/011739 Ceased WO2008143609A1 (fr) 2007-05-16 2007-05-16 Appareil de coupe circulaire

Country Status (1)

Country Link
WO (1) WO2008143609A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995019872A1 (fr) * 1992-05-27 1995-07-27 Romaneck, Larry Scie circulaire pour realiser des decoupes courbes
WO1995029788A1 (fr) * 1994-05-03 1995-11-09 Norton Company Accessoire de machine a tailler angulairement dans un materiau

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995019872A1 (fr) * 1992-05-27 1995-07-27 Romaneck, Larry Scie circulaire pour realiser des decoupes courbes
WO1995029788A1 (fr) * 1994-05-03 1995-11-09 Norton Company Accessoire de machine a tailler angulairement dans un materiau

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