DRIVE WHEEL

• US 20090106987A1
• Filed: 01/05/2009
• Published: 04/30/2009
• Est. Priority Date: 08/14/2002
• Status: Active Grant

• Current Assignee: Aktiebolaget Electrolux
• Original Assignee: Aktiebolaget Electrolux
• Inventors: Juhojuntti, Stigbjorn
• Granted Patent: US 7,905,024 B2
• Time in Patent Office: Days
• US Class Current: 30/389
• CPC Class Codes: B23D 47/123 acting on the disc of the saw blade
• CPC Class Codes: B27B 5/14 Rim-driven circular saws
• CPC Class Codes: Y10T 83/9403 Disc type

Abstract

A drive wheel for centerless drive of an annular saw blade of a cutting machine. The drive wheel includes a drive ring having concentrically arranged first and second annular elements, each of which has a first beveled side surface located radially outward from a second beveled side surface. The second beveled side surfaces are in contact with one another and the first beveled side surfaces together define a wedge-shaped drive groove for the inner edge of an annular saw blade that is to be driven by the drive ring. Third and fourth annular elements are arranged concentrically with, and outboard to the first and second annular elements located therebetween. The third and fourth annular elements are configured to inwardly compress upon the first and second annular elements. An anti-relative-rotation member interconnects the first and second annular elements to prevent relative rotation therebetween while driving the annular saw blade of a cutting machine.

Claims

1. A method for providing a drive wheel for centerless drive of an annular saw blade of a cutting machine, said method comprising:

providing first and second annular elements, each of said annular elements having a first, beveled side surface located radially outward from a second side surface, said second side surfaces being in contact with one another and said first beveled side surfaces together defining a wedge-shaped drive groove for an inner edge of an annular saw blade to be driven by the drive wheel, said first and second annular elements being formed of a highly wear-resistant material selected from the group consisting of sintered carbide, ceramic material, and cold-forged steel;

providing third and fourth annular elements configured to inwardly compress upon said first and second annular elements;

providing an anti-relative-rotation member; and

assembling the drive wheel by interconnecting said first and second annular elements with the anti-relative rotation member and thereby preventing relative rotation between said first and second annular elements when driving an annular saw blade of a cutting machine with the assembled drive wheel.

2. The method as recited in claim 1, further comprising positioning said third and fourth annular elements concentrically with, and outboard to said first and second annular elements located therebetween.

3. A method for providing a drive wheel for centerless drive of an annular saw blade of a cutting machine, said method comprising:

providing first and second annular elements, each of said annular elements having a first, beveled side surface located radially outward from a second side surface, said second side surfaces being in contact with one another and said first beveled side surfaces together defining a wedge-shaped drive groove for an inner edge of an annular saw blade to be driven by the drive wheel, said first and second annular elements being formed of a highly wear-resistant material selected from the group consisting of sintered carbide, ceramic material, and cold-forged steel;

providing third and fourth annular elements configured to inwardly compress upon said first and second annular elements;

providing an anti-relative-rotation means for preventing relative rotation between said first and second annular elements while driving an annular saw blade of a cutting machine; and

assembling the drive wheel with said anti-relative-rotation means interconnected between said first and second annular elements.

4. The method as recited in claim 3, further comprising positioning said third and fourth annular elements concentrically with, and outboard to said first and second annular elements located therebetween.

5. The method as recited in claim 3, wherein said anti-relative-rotation means is an anti-relative-rotation member interconnecting said first and second annular elements when driving an annular saw blade of a cutting machine with the assembled drive wheel.

6. The method as recited claim 3, wherein said anti-relative-rotation means is an adhesive interconnecting said first and second annular elements.

7. A method for providing a drive wheel for centerless drive of an annular saw blade of a cutting machine, said method comprising:

providing first and second annular elements, each of said annular elements having a first, beveled side surface located radially outward from a second side surface, said second side surfaces being in contact with one another and said first beveled side surfaces together defining a wedge-shaped drive groove for an inner edge of an annular saw blade to be driven by the drive wheel, said first and second annular elements being formed of a highly wear-resistant material selected from the group consisting of sintered carbide, ceramic material, and cold-forged steel;

providing third and fourth annular elements configured to inwardly compress upon said first and second annular elements; and

assembling the drive wheel with said third and fourth annular elements arranged concentrically with and outboard to said first and second annular elements located therebetween.

8. The method as recited in claim 7, further comprising:

interconnecting an anti-relative-rotation member between said first and second annular elements thereby preventing relative rotation between said first and second annular elements when driving an annular saw blade of a cutting machine with the assembled drive wheel.

9. The method as recited in claim 7, further comprising:

providing an anti-relative-rotation means for preventing relative rotation between said first and second annular elements when driving an annular saw blade of a cutting machine with the assembled drive wheel.

10. The method as recited claim 9, wherein said anti-relative-rotation means is an adhesive interconnecting said first and second annular elements.

11. The method as recited in claim 10, wherein said adhesive interconnecting said first and second annular elements is soldering.

12. The method as recited in claim 10, wherein said anti-relative-rotation means is an interference fit between said first and second annular elements.

13. The method as recited in claim 12, wherein said interference fit between said first and second annular elements comprises a peg-and-hole coupling wherein a hole of said coupling is positioned in said first annular element and a peg of said coupling is positioned on said second annular element, said peg tightly fitting within said hole.

14. The method as recited in claim 12, wherein said interference fit between said first and second annular elements comprises a tongue-in-groove coupling wherein an annular groove of said coupling is recessed into one of said second beveled side surfaces and an annular tongue of said coupling projects outwardly from the other of said second beveled side surfaces, said annular tongue being tightly fit within said annular groove.

15. The method as recited in claim 12, wherein said second side surfaces are planar and radially oriented within said drive wheel.

16. A method for providing a drive wheel that rotates about a center of rotation for centerless drive of an annular saw blade in a cutting machine and which has two first, annular, beveled surfaces that define between themselves a wedge-shaped drive-groove for accepting an inner edge of the saw blade therein, said method comprising:

providing first and second annular elements each having a first annular beveled surface and a second annular surface axially inside of said first beveled surface, said first and second annular elements being formed of a highly wear-resistant material selected from the group consisting of sintered carbide, ceramic material, and cold-forged steel;

arranging said first and second annular elements in a pair in which each is concentric with the other and said second annular surfaces are in snug contact with each other and said first annular beveled surfaces define between themselves the wedge-shaped drive-groove and are respectively positionable on a side of the inner edge of a saw blade for frictional contact therewith; and

arranging a third and a fourth annular element concentrically with the first and second annular elements and one each being located on either side of paired first and second annular elements for compression thereupon in an axial direction.

17. The method as recited in claim 16, wherein said first beveled surfaces are coated with a wear resistant material.

18. The method as recited in claim 17, wherein said wear resistant material is selected from the group consisting of a carbide compound and a nitride compound.

19. The method as recited in claim 17, wherein said wear resistant material is selected from the group consisting of titanium carbide and titanium nitride.

20. The method as recited in claim 16, wherein said first and second annular elements each further comprises a third annular surface axially positioned inside said annular surfaces, said third annular surfaces defining a narrow recess therebetween that extends in a radial direction inward into the drive wheel.

21. The method as recited in claim 20, wherein said narrow recess has substantially flat sidewalls and has a depth between one-half and one and one-half times a radial depth of the wedge-shaped drive-groove.

22. The method as recited in claim 17, further comprising:

providing an anti-relative-rotation means for preventing relative rotation between said first, second, third, and fourth annular elements.

23. The method as recited in claim 22, wherein said anti-relative-rotation means comprises a member that extends in an axial direction through a recess in said first and second annular elements at a location radially inward of the wedge-shaped drive-groove.

24. The method as recited in claim 22, wherein said anti-relative-rotation means comprises a member that extends in an axial direction through apertures in said first and second annular elements at a location radially inward of the wedge-shaped drive-groove.

25. The method as recited in claim 24, wherein said anti-relative-rotation member extends in the axial direction through apertures in said third and fourth annular elements at a location radially inward of the wedge-shaped drive-groove.

26. The method as recited in claim 25, wherein said anti-relative-rotation member is one of a solid pin and a hollow tube.

27. The method as recited in claim 22, wherein said anti-relative-rotation means is one of non-round form locks, splines, and wedge locks.