Accessories for oscillating power tools

1. An oscillating accessory comprising:

an attachment portion configured to be coupled to an oscillating power tool to oscillate about an oscillating axis;

an inclined portion integrally attached to the attachment portion at an angle to the attachment portion; and

a working portion extending generally along a longitudinal axis that is transverse to the oscillating axis, the working portion having a rear end portion integrally attached to the inclined portion, a front cutting edge opposite the rear end portion, a first side edge extending from the front cutting edge to the rear end portion, and a second side edge opposite the first side edge and extending from the front cutting edge to the rear end portion, the working portion including an at least partially curved surface that contains and is curved along the longitudinal axis and along substantially an entire length of the working portion from the rear end portion to the front cutting edge, at least a portion of the first side edge including a first side cutting edge portion, wherein the working portion is configured to cut a curved opening in a workpiece.

2. The accessory of claim 1 , wherein the second side edge comprises a second side cutting edge portion.

3. The accessory of claim 1 , wherein the attachment portion includes a planar portion that lies generally in a first plane.

4. The accessory of claim 3 , wherein the at least partially curved surface is tangent at the longitudinal axis to a second plane that is generally parallel to the first plane.

5. The accessory of claim 4 , wherein the at least partially curved surface has a concave face that faces away from the attachment portion.

6. The accessory of claim 4 , wherein the at least partially curved surface has a concave face that faces toward the attachment portion.

7. The accessory of claim 1 , wherein the longitudinal axis is parallel to an oscillating axis about which the attachment portion oscillates when the attachment portion is coupled to the oscillating power tool.

8. The accessory of claim 1 , wherein the at least partially curved surface has a radius of curvature.

9. The accessory of claim 8 , wherein the radius of curvature is centered at the oscillating axis.

10. The accessory of claim 8 , wherein the radius of curvature is between approximately 2 inches and approximately 8 inches.

11. The accessory of claim 1 , wherein the front cutting edge has a first plurality teeth and the first side cutting edge portion has a second plurality of teeth.

12. The accessory of claim 1 , wherein a position of the working portion relative to the attachment portion is user adjustable between a rear position and a forward position, the rear position being closer to the attachment portion than the forward position.

13. The accessory of claim 12 , further comprising an intermediate portion coupled between the attachment portion and the working portion, wherein at least one of the intermediate portion, the working portion, and the attachment portion defines a slot therethrough to facilitate the user adjustment of the position of the working portion between the rear position and the forward position.

14. The accessory of claim 13 , further comprising a fastener receivable in the slot and configured to retain the working portion in a plurality of positions between the rear position and the forward position.

15. The accessory of claim 1 , further comprising an intermediate portion disposed between the attachment portion and the working portion, such that the attachment portion is offset from the working portion.

16. The accessory of claim 1 , wherein the at least partially curved surface defines a cord extending from the first side edge to a second side edge.

17. The accessory of claim 16 , wherein the cord has a cord length between approximately 0.70 inches and approximately 2 inches.

18. The accessory of claim 17 , wherein the at least partially curved surface defines a sagitta extending from the longitudinal axis to the cord perpendicular to the cord.

19. The accessory of claim 18 , wherein the sagitta has a length between approximately 0.015 inches and approximately 0.127 inches.

20. The accessory of claim 1 , wherein the front cutting edge has a front curvature that matches a curvature of the at least partially curved surface of the working portion.