# US 2022/0274191 A1 · Saw Tool

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- Number: US 2022/0274191 A1
- Document ID: US20220274191A1
- Status: Published application
- Kind: A1
- Application number: 17/638,262
- Filed: 2020-09-03
- Published: 2022-09-01
- Earliest claimed: 2019-09-04
- Assignees: Robert Bosch GmbH
- Applicants: Robert Bosch GmbH
- Inventors: Heinrich Lauber; Gerald Ducrey Nendaz; Fabian Mooser; Sebastian Burgener; Martin Anthamatten; Martin Imboden
- Web page: https://patentgrep.com/patent/US20220274191A1

## CPC

- B23D 61/006: {Oscillating saw blades}
- B23D 61/127: {of special material}
- B23D: PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR (making toothed gears or the like B23F; cutting metal by applying heat locally B23K; arrangements for copying or controlling B23Q)

## Abstract

The disclosure relates to a saw tool, in particular a saw blade, for a machine tool, in particular an oscillating multifunctional machine tool, comprising at least one iron-containing support and at least one tungsten-containing hard metal strip which has a strip connection edge, wherein the at least one hard metal strip is bonded to the support at the strip connection edge via a diffusion connection which has at least one diffusion zone. The strip connection edge is designed to be at least substantially curved, in particular along a circular arc.

## Claims

### Claim 1

A saw blade, for a multifunctional power tool configured to be driven in oscillation, comprising:
at least one iron-containing carrier; and
at least one tungsten-containing hard metal strip that has a strip connection edge, wherein
the at least one tungsten-containing hard metal strip is connected to the at least one iron-containing carrier at the strip connection edge in a materially bonded manner via a diffusion joint that has at least one diffusion zone, and
the strip connection edge is at least substantially curved along a circular arc.

### Claim 2 (depends on 1)

The saw blade as claimed in claim 1, wherein the strip connection edge extends over a segment angle of at least 15°.

### Claim 3 (depends on 1)

The saw tool as claimed in claim 1, wherein:
the at least one diffusion zone has two end edges that are located at the end regions of the maximum extent of the strip connection edge; and
the end edges are of at least substantially equal lengths.

### Claim 4 (depends on 1)

The saw tool as claimed in claim 1, wherein the at least one tungsten-containing hard metal strip has, opposite the strip connection edge, at least one cutting edge on which cutting teeth are arranged and which extends over a circular segment having a segment angle of at least 15°.

### Claim 5 (depends on 1)

The saw tool as claimed in claim 1, wherein the strip connection edge is at least substantially undulated.

### Claim 6 (depends on 1)

The saw tool as claimed in claim 1, wherein:
the at least one tungsten-containing hard metal strip has at least one cutting edge opposite the strip connection edge;
the at least one cutting edge and the strip connection edge are on average at least substantially parallel to each other; and
the strip connection edge has a lesser maximum extent than the at least one cutting edge.

### Claim 7 (depends on 1)

The saw tool as claimed in claim 1, wherein:
the at least one tungsten-containing hard metal strip has at least one cutting edge opposite the strip connection edge;
the at least one cutting edge has a continuous, curved shape that is at least substantially parallel to the strip connection edge; and
the strip connection edge and the at least one cutting edge each extend over a circular segment having a segment angle of at least 15°.

### Claim 8 (depends on 1)

The saw tool as claimed in claim 1, wherein:
the at least one iron-containing carrier has at least one carrier connection edge by which the at least one iron-containing carrier is connected to the at least one tungsten-containing hard metal strip; and
the at least one iron-containing carrier connection edge has a continuous, curved shape that extends over a circular segment having a segment angle of at least 15°.

### Claim 9 (depends on 1)

A power tool system comprising:
at least one multifunctional power tool that can be driven in oscillation;
at least one saw blade as claimed in claim 1.

### Claim 10 (depends on 1)

A method for producing a saw blade as claimed in claim 1, comprising:
connecting the at least one tungsten-containing hard metal strip to the at least one iron-containing carrier.

### Claim 11 (depends on 10)

The method as claimed in claim 10, further comprising:
effecting a spatially inhomogeneous depletion of alloy particles in the at least one tungsten-containing hard metal strip to achieve the diffusion joint.