Cutting and sanding attachments for a hand drill

• US 4,972,589 A
• Filed: 08/31/1989
• Issued: 11/27/1990
• Est. Priority Date: 08/31/1989
• Status: Expired due to Fees

• Current Assignee: Robert W. Povleski
• Original Assignee: Robert W. Povleski
• Inventors: Povleski, Robert W.
• Primary Examiner(s): Watts, Douglas D.
• Application Number:
  US07/401,622
• Time in Patent Office: 453 Days
• Field of Search: 30/296.1, 30/383, 30/388, 30/390, 30/166.3, 30/122, 30/500
• US Class Current: 30/500
• CPC Class Codes: B23B 45/003 Attachments
• 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: B24B 23/02 with rotating grinding tools; Accessories therefor

Abstract

Attachments for a power source such as a rotary drill. Such attachments can be fixedly secured to the power source. Turning power on to the source drives a shaft which drives a gear mechanism which drives a utility woodworking head such as a circular saw or power sander. The power source may be turned on indirectly by a false trigger mechanism slidably attached to a housing so enclosing the drive shaft and assisting to support the apparatus.

Claims

1. An attachment for a rotary power source which has an integral on/off control, said attachment comprising:

a gear mechanism;

a utility head for performing precision woodworking tasks, said head coupled to and driven to rotate by said gear mechanism;

a rotatable shaft attachable to said power source, said shaft rotating to drive said gear mechanism when said power source is on;

a housing enclosing at least said shaft, said housing including means for supporting said attachment and including an outer surface adapted to be grasped by an user; and

a false trigger mechanism for controlling an operation of said power source, said false trigger mechanism being slidably mounted on said housing and having means for contacting said integral on/off control of said rotary power source to control said power source so as to allow said user to easily control on and off operation of said attachment while grasping said outer surface of said housing, said false trigger mechanism being located closer to said utility head than to said power source, said false trigger mechanism including a false trigger, a trigger extension extending toward said power source, said extension being fixedly connected with said false trigger, and a trigger push for physically contacting said integral on/off switch of said power source, said trigger push fixedly connected to said trigger extension so that when said false trigger slides, said trigger push slides accordingly.

2. Apparatus as in claim 1 wherein said utility head comprises a rotary saw blade.

3. Apparatus as in claim 1 wherein said utility head comprises a drum sander.

4. Apparatus as in claim 1 wherein said gear mechanism comprises:

a shaft gear securely mounted on an end of said shaft; and

other gears driven by said shaft gear, said other gears driving said utility head.

5. Apparatus as in claim 1 wherein said housing is made of a material from the group consisting of high impact plastics and metals.

6. Apparatus as in claim 2 wherein said attachment further includes a saw guide which keeps an incision made by said blade at a even depth.

7. Apparatus as in claim 2 further comprising a three piece blade guard which includes:

a stationary piece mounted to said housing and covering about 25% of the blade and being curved with a first radius;

a first rounded piece for covering a part of the blade and having a second radius less than said first radius; and

a second rounded piece for covering another part of the blade and having a third radius being less than said second radius and designed so that said second rounded piece can be rotated under said first piece and both can be rotated under said stationary piece so that the blade can be uncovered.

8. Apparatus as in claim 3 wherein said drum sander includes a head on which sandpaper can be fastened having interior supports for securely mounting said head to said drum sander attachment.

9. A method of using a woodworking attachment for a power drill comprising the steps of:

attaching a drive shaft, enclosed by a supportive housing, to a drill chuck of a power hand drill;

initiating operation of said power drill by pressing a false trigger mechanism slidably mounted on said housing, thereby pressing a trigger of said power drill and allowing power of the drill to turn said drive shaft;

driving a gear mechanism engaged with said shaft; and

driving a utility woodworking head by the turning of said gear mechanism, said woodworking head located nearer said false trigger than said power source.

10. A method as in claim 9 wherein said utility woodworking head is a circular saw blade.

11. A method as in claim 9 wherein said utility woodworking head is a power sander.

12. The method of claim 9 further comprising the step of tightening said drill chuck to hold said drive shaft.

13. An attachment for a rotary power source, said attachment comprising:

a rotatable drive shaft, including means for attaching to said power source at one end of said drive shaft;

a gear mechanism located at one end of said drive shaft and driven to rotate by a rotation of said drive shaft;

a housing enclosing said drive shaft and a portion of said gear mechanism and including means for supporting said shaft to rotate in a substantially central portion of said housing, said housing including;

(a) a first end housing said one end of said drive shaft;

(b) an inner surface;

(c) means for maintaining said power source, when attached, as spaced from said inner surface, said maintaining means coupled to said inner surface;

(d) an outer surface, coupled to said inner surface, forming a surface by which said attachment can be grasped during operation;

(e) a second end; and

(f) a utility head driven by said gear mechanism, said utility head being adapted to perform woodworking functions.

14. An attachment as in claim 13 wherein said housing is cylindrical.

15. An attachment as in claim 13 wherein said means for attaching is a surface of said drive shaft, and said housing is formed with a hole therein through which tightening between said rotary power source and said means for attaching can be accomplished.

16. An attachment as in claim 13 wherein said means for attaching is a hexagonal outer perimeter of said drive shaft.