Cutting attachment with a removable cover for rotary hand tools

• US 7,596,872 B2
• Filed: 07/27/2006
• Issued: 10/06/2009
• Est. Priority Date: 07/27/2006
• Status: Active Grant

• Current Assignee: Credo Technology Corporation
• Original Assignee: Robert Bosch GmbH
• Inventors: Clarke, David A., Prince, Garth W.
• Primary Examiner(s): PAYER, HWEI SIU CHOU
• Application Number:
  US11/494,117
• Publication Number:
  US 20080022537A1
• Time in Patent Office: 1,167 Days
• Field of Search: 303/73, 303/88, 303/90, 303/91, 144/136.95, 144/154.5, 411/353, 451/358
• US Class Current: 30/391
• CPC Class Codes: B23D 45/16 Hand-held sawing devices with circular saw blades
• CPC Class Codes: B23D 57/0076 Devices for converting any machine for sawing purposes
• CPC Class Codes: B25F 3/00 Associations of tools for different working operations with one portable power-drive means; Adapters therefor
• CPC Class Codes: B25H 1/0078 Guiding devices for hand tools

Abstract

Embodiments of an accessory attachment for a rotary power hand tool are disclosed wherein the hand tool is of the type which has a tool housing with a preferably cylindrical nose portion, a motor having a motor drive shaft with a mounting coupling extending forwardly from the nose portion for receiving a drive shaft, the attachment including a housing having a first end portion configured to be mounted to the tool housing nose portion and an input shaft for coupling to the motor drive shaft, and having an enlarged second end portion oriented at a right angle relative to the first end portion and also having an output shaft coupled to the input shaft at a preferably right angle relative thereto, a rotary cutting wheel mounted to the output shaft and substantially disposed within the enlarged second end portion, excepting an exposed portion of the rotary cutting wheel for engaging a work surface, and a removable cover configured to engage said enlarged second end portion to at least partially enclose said rotary cutting wheel therebetween.

Claims

1. An accessory attachment for a rotary power hand tool of the type which has a tool housing with a nose portion, a motor having a motor drive shaft with a mounting coupling extending forwardly from the nose portion for receiving a drive shaft, said attachment comprising:

a housing having first and second end portions, said first end portion configured to be mounted to the tool housing nose portion and an input shaft for coupling to the motor drive shaft, said second end portion oriented at an angle relative to said first end portion and having an output shaft coupled to said input shaft at an angle relative thereto;

a rotary cutting wheel mounted to said output shaft and substantially disposed within said second end portion, excepting an exposed portion of said rotary cutting wheel for engaging a work surface;

a mounting flange for clamping said rotary cutting wheel to said output shaft of said accessory attachment, said mounting flange having a hexagonal mounting portion, an enlarged flange portion having a contacting surface, a threaded extension with a threaded end portion, said flange portion being integrally formed with the hexagonal mounting portion and

a removable cover configured to engage said second end portion to at least partially enclose said rotary cutting wheel therebetween.

2. The accessory attachment of claim 1 wherein said removable cover and said second end portion being configured to releasably and lockingly engage one another.

3. The accessory attachment of claim 1 wherein said rotary cutting wheel further comprises a dome-shaped wheel having an annular cutting flange and a recessed hub.

4. The accessory attachment of claim 3 wherein said second end portion further comprises a correspondingly dome-shaped outer configuration and encloses a substantial portion of said rotary cutting wheel therein.

5. The accessory attachment of claim 1 wherein said cover has at least two hooks located on opposite sides of the wheel, each of which engage a recess in said second end portion, and a locking member for engaging a third recess in said second end portion.

6. The accessory attachment of claim 5 further comprising a release button operatively connected to said locking member, said release button releasing the clamping force of the locking member when said release button is pressed.

7. The accessory attachment of claim 1 wherein said rotary cutting wheel comprises a dome-shaped cutting wheel having a recessed hub portion with a flat center hub portion in which a mounting opening is located and an annular outer flange, said annular flange having side faces and an outer peripheral cutting surface.

8. The accessory attachment of claim 7 wherein said outer peripheral surface has tungsten carbide grit bonded thereto.

9. The accessory attachment of claim 7 wherein said annular flange has a first predetermined diameter, said center hub portion has a second predetermined diameter, said mounting opening has a third predetermined diameter, said annular outer flange has a predetermined thickness and the plane of said center hub portion is displaced from the plane of said outer flange by a predetermined height.

10. The accessory attachment of claim 9 wherein said predetermined height is within the range of about 7 to about 13% of said first predetermined diameter.

11. The accessory attachment of claim 9 wherein said second predetermined diameter is within the range of about 20 to about 35% of said first predetermined diameter.

12. The accessory attachment of claim 9 wherein said third predetermined diameter is within the range of about 10 to about 15% of said first predetermined diameter.

13. The accessory attachment of claim 9 wherein said first predetermined diameter is about 98 millimeters.

14. The accessory attachment of claim 9 wherein the predetermined thickness of said outer flange is about 0.91 millimeters and said wheel is made from steel.

15. An accessory attachment for a rotary power hand tool of the type which has a tool housing with a nose portion, a motor having a motor drive shaft with a mounting coupling extending forwardly from the nose portion for receiving a drive shaft, said attachment comprising:

a housing having first and second end portions, said first end portion configured to be mounted to the tool housing nose portion and an input shaft for coupling to the motor drive shaft, said second end portion oriented at an angle relative to said first end portion and having an output shaft coupled to said input shaft at an angle relative thereto;

a rotary cutting wheel mounted to said output shaft and substantially disposed within said second end portion, excepting an exposed portion of said rotary cutting wheel for engaging a work surface;

wherein said rotary cutting wheel comprises a dome-shaped cutting wheel having a recessed hub portion with a flat center hub portion in which a mounting opening is located and an annular outer flange, said annular flange having side faces and an outer peripheral cutting surface;

a removable cover configured to engage said second end portion to at least partially enclose said rotary cutting wheel therebetween; and

a mounting flange for clamping said rotary cutting wheel to said output shaft of said accessory attachment, said mounting flange having a hexagonal mounting portion, an enlarged flange portion having a contacting surface, a threaded extension with a threaded end portion, said flange portion being integrally formed with the hexagonal mounting portion.

16. The accessory attachment of claim 15 further comprising an annular cavity in said flange portion which causes said contacting surface to be ring shaped.

17. The accessory attachment of claim 15 further comprising a reduced diameter portion between said threaded end portion and said flange portion.

18. The accessory attachment of claim 15 further comprising a hexagonal recess formed in said hexagonal mounting portion.

19. The accessory attachment of claim 15 wherein the outer diameter of said flange portion is substantially the size of said center hub portion of said wheel.

20. A mounting flange for clamping a rotary cutting wheel to an output shaft of an accessory attachment, said mounting flange comprising:

a hexagonal mounting portion,

an enlarged flange portion having a planar contacting surface,

an annular cavity in said flange portion wherein the flange portion defines a wide ring shaped contacting surface that is configured to contact a cutting wheel,

a threaded extension with a threaded end portion extending outwardly with respect to the flange portion and opposite the hexagonal mounting portion, said flange portion being integrally formed with the hexagonal mounting portion,

a reduced diameter portion between said threaded end portion and said flange portion.

21. The mounting flange of claim 20 further comprising a hexagonal recess formed in said hexagonal mounting portion.