CUTTING BLADE

• US 20120174414A1
• Filed: 12/06/2011
• Published: 07/12/2012
• Est. Priority Date: 01/10/2011
• Status: Active Grant

• Current Assignee: Fiskars Brands Finland Oy AB (Fiskars Oyj Abp)
• Original Assignee: Fiskars Brands Finland Oy AB (Fiskars Oyj Abp)
• Inventors: Paloheimo, Markus, Magnusson, Fredrik, Masalin, Petteri, Huhtala, Juha
• Granted Patent: US 8,959,780 B2
• Time in Patent Office: Days
• US Class Current: 30/208
• CPC Class Codes: A01G 3/053 motor-driven

Abstract

A cutting blade includes a first and a second elongated frame part, and projections protruding from the first and the second elongated frame part in the cross direction. The first and the second frame part are attached to each other by blades, the blades being individually attached to the first frame part at first pivot points and to the second frame part at second pivot points so that the opposite ends of the blades protrude from the first and second pivot points, respectively, in the cross direction of the frame parts. The first and the second elongated frame part are movable relative to each other to rotate the blades around the first and second pivot points and to generate a cutting movement between each end of the blade and projection approaching each other.

Claims

1. A cutting blade, comprising:

a first and a second elongated frame part; and

projections protruding from the first and the second elongated frame part in the cross direction, wherein

the first and the second frame part are attached to each other by blades, the blades being individually attached to the first frame part at first pivot points and to the second frame part at second pivot points in such a way that the opposite ends of the blades protrude from the first and second pivot points, respectively, in the cross direction of the frame parts; and

the first and the second elongated frame part are movable relative to each other to rotate the blades around the first and second pivot points and to generate a cutting movement between each end of the blade and projection approaching each other.

2. A cutting blade according to claim 1, wherein the cutting blade comprises adjacent projections whose edges positioned opposite to each other are at least partly directed in such a way that the distance between the edges decreases as the distance to the joining points of the projections and the frame part increases.

3. A cutting blade according to claim 1, wherein the first frame part, the first pivot points are positioned between the projections, seen in the longitudinal direction, and in the second frame part, the second pivot points are positioned between the projections, seen in the longitudinal direction.

4. A cutting blade according to claim 1, wherein a first end of the first and the second frame part, respectively, is provided with an operation opening to receive the transmission member of the actuator of the cutting blade.

5. A cutting blade according to claim 1, wherein the first and the second frame part, respectively, are provided with one or more curved grooves between the operation opening and the blade closest to it to receive support pins in the actuator of the cutting blade.

6. A cutting blade according to claim 1, wherein the cutting blade is the cutting blade of a hedge trimmer.

7. A cutting blade according to claim 1, wherein

the first and second elongated frame part are shaped to have a respective blade surface in a common plane, and

the blades are arranged on a same side of the first and second elongated frame part against the respective blade surfaces.

8. A cutting blade according to any one of claims 1, wherein the blades are individually attached to the first frame part at first pivot points and to the second frame part at second pivot points by screws or rivets.

9. A cutting blade according to claim 8, wherein

the blades comprise protrusions protruding into holes in the frame parts at the locations of the first and second pivot points or the frame parts comprise protrusions protruding into holes in the blades at the locations of the first and second pivot points,

the cutting blade comprises en elongated attachment element arranged against a surface of one or more blades such that the blades are located between the elongated attachment element and the frame parts, and

the elongated attachment element is fixed to the cutting blade by screws or rivets attaching the frame parts and the elongated attachment element to each other such that the attachment element presses the blades against the frame parts and the keeps the protrusions in the holes.

10. A cutting blade according to claim 1, wherein the opposite ends of the blades have been sharpened by removing material from only one side of the blades.

11. A cutting blade, comprising:

a first and a second elongated frame part movable relative to each other in a reciprocating manner;

a plurality of projections protruding from the first and the second elongated frame part in the cross direction and defining spaces therebetween;

a plurality of blades individually coupled to the first elongated frame part at first pivot points disposed along a length of the first elongated frame part and to the second elongated frame part at second pivot points disposed along a length of the second elongated frame part, so that the blades rotate about the first and second pivot points and move across the spaces between the projections as the first and a second elongated frame parts move relative to each other in a reciprocating manner.

12. The cutting blade according to claim 11, wherein the spaces between the projections define a shape that forms a closed loop with the blades as the blades move across the spaces.

14. The cutting blade according to claim 11, wherein the increasing width of the projections define a shape between adjacent projections that forms a closed loop with the blades as the blades move across the spaces.

13. A cutting blade, comprising:

a first and a second elongated frame part each having a plurality of laterally extending projections, at least some of the projections having an increasing width proximate their free ends;

a plurality of blades coupled to the first elongated frame part at first pivot points disposed along a length of the first elongated frame part and to the second elongated frame part at second pivot points disposed along a length of the second elongated frame part, so that the blades rotate about the first and second pivot points and move across spaces between the projections as the first and a second elongated frame parts move relative to each other in a reciprocating manner.