Double gear hedge shears
AssigneeFiskars Consumer Oy OB
InventorsOlavi Lindèn, Markus Paloheimo
Life of this patent
Estimating the term…
Abstract
A hedge having two opposing cutting blades connected to handles. Both of the cutting blades and both of the handles have gear elements formed as part of the blade or handle. The gear element of one handle engages the gear element of one of the cutting blades, while the gear element of the other handle engages the gear element of the other cutting blade so that a variable force is provided throughout the cutting stroke.
Claims20
A cutting tool having two sets of meshing gears for generating increased output force, the cutting tool comprising:
- first and second handles, the first handle including a first handle gear and the second handle including a second handle gear, wherein the first and second handle gears are symmetrical;
- first and second blades, the first blade including a first blade gear and the second blade including a second blade gear, wherein the first and second blade gears are symmetrical;
- means for attaching the first handle to the first blade and the second handle to the second blade;
- and
- means for pivotably connecting the first blade to the second blade;
- wherein the first handle gear meshes with the second blade gear and the second handle gear meshes with the first blade gear such that the cutting force increases as the first and second blades are moved to a closed position;
- wherein the first and second handle gears include a plurality of teeth and the outermost tooth is longer than the innermost tooth.
A cutting tool, comprising:
- a first handle having a first gear element;
- a second handle having a second gear element;
- a first cutting blade having a third gear element and connected to the first handle;
- and
- a second cutting blade having a fourth gear element and connected to the second handle;
- wherein the first gear element engages the fourth gear element and the second gear element engages the third gear element.
- wherein at least one of the gear elements includes a plurality of teeth that vary in length to provide a cutting force ratio that varies during a cutting stroke.
A hedge shear having improved cutting ability, comprising:
- a first cutting element including a first handle, a first blade, a first handle gear, and a first blade gear;
- a second cutting element including a second handle, a second blade, a second handle gear, and a second blade gear;
- a connector for pivotably connecting the first and second cutting elements, such that the first handle gear engages the second blade gear and the second handle gear engages the first blade gear.
- wherein a plurality of the gears each include a plurality of teeth that differ in shape to provide a varying cutting force ratio as the first blade and second blade are moved toward each other.
A cutting tool having two sets of meshing gears for generating increased output force, the cutting tool comprising:
- first and second handles, the first handle including a first handle gear and the second handle including a second handle gear, wherein the first and second handle gears are symmetrical and wherein the first handle gear and the second handle gear each include a plurality of teeth, at least one of the plurality of teeth having a first shape and at least one of the plurality of teeth having a second shape different from the first shape;
- first and second blades, the first blade including a first blade gear and the second blade including a second blade gear, wherein the first and second blade gears are symmetrical;
- means for attaching the first handle to the first blade and the second handle to the second blade;
- and
- means for pivotably connecting the first blade to the second blade;
- wherein the first handle gear meshes with the second blade gear and the second handle gear meshes with the first blade gear such that the cutting force increases as the first and second blades are moved to a closed position.
Dependencies are inferred from the claim text.