Hole saw

• US 6,588,992 B2
• Filed: 02/06/2001
• Issued: 07/08/2003
• Est. Priority Date: 02/06/2001
• Status: Expired due to Fees

• Current Assignee: Black & Decker Incorporated (Stanley Black & Decker, Inc.)
• Original Assignee: Black & Decker Incorporated (Stanley Black & Decker, Inc.)
• Inventors: Rudolph, Scott
• Primary Examiner(s): TSAI, HENRY
• Application Number:
  US09/777,305
• Publication Number:
  US 20020106254A1
• Time in Patent Office: 882 Days
• Field of Search: 408/204, 408/206, 408/207, 408/209, 408/703, 408/223
• US Class Current: 408/204
• CPC Class Codes: B23B 2251/14 Configuration of the cutting part, i.e. the main cutting edges
• CPC Class Codes: B23B 2251/285 Cutting teeth arranged at different heights
• CPC Class Codes: B23B 51/04 Drills for trepanning
• CPC Class Codes: B23B 51/0411 with stepped tubular cutting bodies
• CPC Class Codes: B23B 51/0426 with centering devices
• CPC Class Codes: Y10T 408/895 Having axial, core-receiving central portion
• CPC Class Codes: Y10T 408/8957 and having stepped cutting edges

Abstract

A hole saw having a cylindrical shape includes a plurality of repetitive groups of saw teeth. The repetitive groups include a first inboard set tooth and a first outboard set tooth. The inboard set tooth is displaced a distance greater than the outboard set tooth. Each repetitive group further includes taller straight teeth. The set teeth have a smaller back angle and a longer shoulder than the straight teeth.

Claims

1. A cutting tool comprising:

a cylindrical body;

a plurality of identical repetitive tooth groups disposed sequentially along an edge of said cylindrical body, each tooth group having fewer than six teeth including a plurality of straight teeth and a plurality of set teeth;

one of said plurality of set teeth having a radial offset at a predetermined distance in an outboard direction; and

a second of said plurality of set teeth having a radial offset at a predetermined distance in an inboard direction;

wherein the predetermined inboard distance is greater than the predetermined outboard distance.

2. The cutting tool of claim 1, wherein said plurality of straight teeth of each tooth group are of equivalent height.

3. The cutting tool of claim 1, wherein said plurality of set teeth are of equivalent height.

4. The cutting tool of claim 1, wherein said plurality of straight teeth includes three straight teeth.

5. The cutting tool of claim 1, wherein said plurality of set teeth have a smaller back angle than said plurality of straight teeth.

6. The cutting tool of claim 1, wherein said plurality of set teeth have a longer shoulder than said plurality of straight teeth.

7. The cutting tool of claim 1, wherein said plurality of straight teeth are taller than said plurality of set teeth.

8. The cutting tool of claim 1, wherein said plurality of straight teeth are spaced further apart than said plurality of set teeth.

9. The cutting tool of claim 1, wherein said plurality of set teeth have an upper back angle and a lower back angle which are lower than an upper back angle and a lower back angle, respectively, of said plurality of straight teeth.

10. The cutting tool of claim 1, wherein said plurality of set teeth have an upper back angle of approximately 20°

and a lower straight section having a lower back angle of approximately 45°

.

11. The cutting tool of claim 10, wherein said plurality of straight teeth have a back shoulder having an upper straight section having an upper back angle of approximately 25°

and a lower straight section having a lower back angle of approximately 50°

.

12. A culling tool, comprising:

a cylindrical body;

a plurality of identical repetitive tooth groups disposed sequentially along an edge of said cylindrical body, each tooth group having fewer than six teeth including a plurality of straight teeth and a plurality of set teeth, one of said plurality of set teeth having a radial offset in an outboard direction and a second of said plurality of set teeth having a radial offset in an inboard direction, said plurality of set teeth having a back angle that is smaller than a back angle of said plurality of straight teeth.

13. The cutting tool of claim 12, wherein said one of said plurality of set teeth offset in an outboard direction is offset further than said second of said plurality of set teeth offset in said inboard direction.

14. The cutting tool of claim 12, wherein said plurality of straight teeth include at least three straight teeth.

15. The cutting tool of claim 12, wherein said plurality of straight teeth are taller than said plurality of set teeth.

16. The cutting tool of claim 12 wherein said plurality of set teeth have a longer shoulder than said plurality of straight teeth.

17. The cutting tool of claim 12, wherein said plurality of set teeth are of equivalent height.

18. The cutting tool of claim 12, wherein said plurality of straight teeth are of equivalent height.

19. The cutting tool according to claim 12, wherein said plurality of set teeth have a back shoulder having an upper straight section having an upper back angle of approximately 20°

and a lower straight section having a lower back angle of approximately 45°

.

20. The cutting tool according to claim 19, wherein said plurality of straight teeth have a back shoulder having an upper straight section having an upper back angle of approximately 25°

and a lower straight section having a lower back angle of approximately 50°

.

21. A culling tool comprising:

a cylindrical body;

a plurality of identical repetitive tooth groups disposed sequentially along an edge of said cylindrical body, each tooth group having fewer than six teeth including at least one straight tooth and a plurality of set teeth, one of said plurality of set teeth having a radial offset in an outboard direction and a second of said plurality of set teeth having a radial offset in an inboard direction, said plurality of set teeth having a back shoulder having an upper straight section having an upper back angle and a lower straight section having a lower back angle greater than said upper back angle, said upper back angle being smaller than a back angle of said at least one straight tooth.

22. The cutting tool of claim 21, wherein each tooth group includes a plurality of straight teeth.

23. The cutting tool of claim 21, wherein said at least one straight tooth is taller than said plurality of set teeth.

24. The cutting tool of claim 21, wherein said plurality of set teeth have a longer shoulder than said at least one straight tooth.

25. The cutting tool according to claim 21, wherein said upper back angle of said set teeth is approximately 20°

and said lower back angle of said set teeth is approximately 45°

.

26. The culling tool according to claim 25, wherein said at least one straight tooth has a back shoulder having an upper straight section having an upper back angle of approximately 25°

and a lower straight section having a lower back angle of approximately 50°

.

27. A culling tool, comprising:

a cylindrical body;

a plurality of identical repetitive tooth groups disposed sequentially along an edge of said cylindrical body, each tooth group having fewer than six teeth including a plurality of straight teeth each having an equivalent height and a plurality of set teeth each having an equivalent height and being shorter than said straight teeth, wherein said plurality of straight teeth are spaced further apart than said plurality of set teeth.

28. The cutting tool of claim 27, wherein said plurality of set teeth have a longer shoulder than said plurality of straight teeth.

29. The cutting tool of claim 27, wherein said plurality of set teeth have a smaller back angle than said plurality of straight teeth.

30. The cutting tool according to claim 27, wherein said plurality of set teeth have a back shoulder having an upper straight section having an upper back angle of approximately 20°

and a lower straight section having a lower back angle of approximately 45°

.

31. The culling tool according to claim 30, wherein said plurality of straight teeth have a back shoulder having an upper straight section having an upper back angle of approximately 25°

and a lower straight section having a lower back angle of approximately 50°

.