Rotary reciprocating saw blade for a power tool

1. A rotary reciprocating saw blade for a power tool, comprising:

a blade body having an at least four-cornered shape defining:

an at least approximately rectilinear cutting edge;

at least one cavity that extends through the blade body; and

a plurality of linear or strip-shaped impressions in the blade body, the impressions located such that each side of the at least one cavity is delimited by a respective impression, and such that each corner of the blade body is connected to at least one other corner of the blade body by a further respective impression.

2. The rotary reciprocating saw blade as claimed in claim 1 , wherein at least two of the impressions run in respective diagonal directions, such that diagonally situated corners of the blade body are connected by a respective diagonally running impression.

3. The rotary reciprocating saw blade as claimed in claim 1 , wherein:

the blade body further has a first side face and a second side face opposite the first side face; and

each impression includes a depression in the first side face and a corresponding elevation in the second side face.

4. The rotary reciprocating saw blade as claimed in claim 3 , wherein:

the impressions are at least one of:

longitudinally running impressions; and

transversely running impressions.

5. The rotary reciprocating saw blade as claimed in claim 3 , wherein at least one of the impressions is formed by stamping in the first side face of the blade body.

6. The rotary reciprocating saw blade as claimed in claim 3 , wherein a depth of the depression in each of the impressions is at least 0.1 mm.

7. The rotary reciprocating saw blade as claimed in claim 3 , wherein a width of each of the impressions is maximally one-third of a blade height.

8. The rotary reciprocating saw blade as claimed in claim 3 , wherein the rotary reciprocating saw blade has local chemical finishing treatments.

9. The rotary reciprocating saw blade as claimed in claim 3 , wherein the rotary reciprocating saw blade has local thermal finishing treatments.

10. The rotary reciprocating saw blade as claimed in claim 1 , wherein:

the at least one cavity includes a plurality of cavities; and

at least two of the plurality of cavities are separated by one or more of the impressions.

11. A rotary reciprocating saw blade for a power tool, comprising:

a blade body having:

a cutting edge;

a plurality of linear or strip-shaped impressions that includes:

a first impression that is adjacent to and substantially parallel with the cutting edge;

a second impression that is distal to and substantially parallel with the cutting edge;

a pair of third and fourth impressions that each extend from a respective end of the first impression to a corresponding end of the second impression and define a respective lateral side of the blade body;

a fifth impression that extends from a midpoint of the first impression to a midpoint of the second impression along a midline of the blade body; and

at least one sixth impression that extends from the third impression to the fourth impression; and

a plurality of cavities that extend through the blade body, each cavity positioned so that each side of the cavity is delimited by a respective one of the plurality of impressions.

12. The rotary reciprocating saw blade of claim 11 , wherein the third and fourth impressions are substantially rectilinear.

13. The rotary reciprocating saw blade of claim 12 , wherein the at least one sixth impression includes a pair of diagonal impressions that extend from a respective end of the third impression to a corresponding diagonally opposite end of the fourth impression.

14. The rotary reciprocating saw blade of claim 11 , wherein the blade body further has a circular impression located at an intersection of the fifth impression and the at least one sixth impression.

15. The rotary reciprocating saw blade of claim 11 , wherein the third and fourth impressions curve toward each other in a middle portion of the blade body.

16. The rotary reciprocating saw blade of claim 15 , wherein the at least one sixth impression is substantially parallel to the cutting edge.

17. The rotary reciprocating saw blade of claim 11 , wherein the plurality of cavities includes six cavities that are symmetrically disposed along the midline of the blade body.

18. A power tool, comprising:

a rotary reciprocating saw blade including:

a blade body having an at least four-cornered shape defining:

an at least approximately rectilinear cutting edge;

a first side face;

a second side face opposite the first side face;

at least one cavity that extends through the blade body from the first side face to the second side face; and

a plurality of linear or strip-shaped impressions, the impressions located such that each side of the at least one cavity is delimited by a respective impression, and such that each corner of the blade body is connected to at least one other corner of the blade body by a further respective impression, each impression including a depression in the first side face and a corresponding elevation in the second side face.