# US 8,771,837 B2 · Metal fiber with chamfered longitudinal corners

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- Number: US 8,771,837 B2
- Document ID: US8771837B2
- Status: Granted
- Kind: B2
- Application number: 13/389,960
- Filed: 2010-07-07
- Published: 2012-09-13
- Granted: 2014-07-08
- Earliest claimed: 2009-10-08
- Assignees: Cent & Cent GmbH & Co. KG
- Applicants: Karl-Hermann Stahl
- Inventors: Karl-Hermann Stahl
- Web page: https://patentgrep.com/patent/US8771837B2

## CPC

- E04C 5/012: {Discrete reinforcing elements, e.g. fibres}
- E04C 5/01: Reinforcing elements of metal, e.g. with non-structural coatings {(E04C5/08 takes precedence)}
- E04C 5/03: with indentations, projections, ribs, or the like, for augmenting the adherence to the concrete
- E04C 5/073: {Discrete reinforcing elements, e.g. fibres}
- C04B 14/48: Metal
- Y10T 428/12389: having variation in thickness
- Y10T 428/12431: Foil or filament smaller than 6 mils
- E04C: STRUCTURAL ELEMENTS; BUILDING MATERIALS (for bridges E01D; specially designed for insulation or other protection E04B; elements used as building aids E04G; for mining E21; for tunnels E21D; structural elements with broader range of application than for building engineering F16, particularly F16S)
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The metal fiber has fiber outer surfaces (1) oriented substantially at right angles to each other and can also be provided with bent ends in the shape of a clip. The metal fiber is used to stabilize, strengthen, or fasten materials such as concrete, wood and the like. The fiber edges (2) formed by the fiber outer surfaces (1) of the metal fiber and extending in the longitudinal direction of the fiber are designed as edge surfaces (4) oriented at an angle to the fiber outer surfaces (1) in the manner of a chamfer. Said edge surfaces (4) have projections, which form anchoring heads (3) that are anchored in the materials to be stabilized, strengthened, or fastened.

## Claims

### Claim 1

In a metal fiber having outer faces oriented substantially at right angles to one another, and also having bent ends in the shape of a fastener, for stabilizing, strengthening, or fastening materials and wherein corners formed by outer faces of the metal fiber and extending longitudinally of the fiber are chamfered to form edge faces oriented at an angle to the outer faces, the improvement wherein:
the edge faces have projections that form anchor heads for the materials to be stabilized, strengthened, or fastened,
the anchor heads form beveled anchor faces that enlarge the cross-section of the fiber in the area of the edge faces, and
a cross-section of the fiber has a substantially square shape in centers of the anchor heads.

### Claim 2 (depends on 1)

The metal fiber in accordance with claim 1, wherein the beveled anchor faces are oriented at an angle of 10° to 60° relative to a longitudinal axis of the fiber.

### Claim 3 (depends on 1)

The metal fiber in accordance with claim 1, wherein the beveled anchor faces are oriented at an angle of 15° to 30° to a longitudinal axis of the fiber.

### Claim 4

In a metal fiber having outer faces oriented substantially at right angles to one another, and also having bent ends in the shape of a fastener, for stabilizing, strengthening, or fastening materials and wherein corners formed by outer faces of the metal fiber and extending longitudinally of the fiber are chamfered to form edge faces oriented at an angle to the outer faces, the improvement wherein:
the edge faces have projections that form anchor heads for the materials to be stabilized, strengthened, or fastened,
the anchor heads form beveled anchor faces that enlarge the cross-section of the fiber in the area of the edge faces, and
the beveled anchor faces of each anchor head are axially symmetrical and, relative to the center of the respective anchor head, symmetrical at the same angle.

### Claim 5

In a metal fiber having outer faces oriented substantially at right angles to one another, and also having bent ends in the shape of a fastener, for stabilizing, strengthening, or fastening materials and wherein corners formed by outer faces of the metal fiber and extending longitudinally of the fiber are chamfered to form edge faces oriented at an angle to the outer faces, the improvement wherein:
the edge faces have projections that form anchor heads for the materials to be stabilized, strengthened, or fastened,
the anchor heads form beveled anchor faces that enlarge the cross-section of the fiber in the area of the edge faces,
the beveled anchor faces of each anchor head are asymmetrical at unequal angles, and
the beveled anchor face closer to the end of the metal fiber has a smaller angle.

### Claim 6 (depends on 1)

The metal fiber in accordance with claim 1, wherein the edge faces meet the outer face at an angle of 30° to 60°.

### Claim 7 (depends on 1)

The metal fiber in accordance with claim 1, wherein the edge faces meet the outer face at an angle of 45°.

### Claim 8 (depends on 1)

The metal fiber in accordance with claim 1, wherein a transverse width of the outer face between the anchor heads is about 33% of a thickness or width of the fiber.

### Claim 9 (depends on 1)

The metal fiber in accordance with claim 1, wherein the fiber is produced from strip material using a notching roll process and separating process, with a flexing process preceding the separating process.

### Claim 10 (depends on 1)

The metal fiber in accordance with claim 1, wherein the anchor heads are provided only in pairs and not on all of the edge faces.

### Claim 11 (depends on 1)

The metal fiber in accordance with claim 1, wherein the anchor heads are provided only on the two edge faces meeting the outer face, the ends being angled relative to the fastener such that the anchor heads are opposite one another on the inside of the fastener.