US 11,654,585 B2
Hand operated shearing tool
Erkki Olavi Lindén, Billnas (FI)
Assigned to Fiskars Finland Oy Ab, Espoo (FI)
Appl. No. 17/263,028
Filed by Fiskars Finland Oy Ab, Helsinki (FI)
PCT Filed Jun. 11, 2019, PCT No. PCT/FI2019/050449
§ 371(c)(1), (2) Date Jan. 25, 2021,
PCT Pub. No. WO2020/021159, PCT Pub. Date Jan. 30, 2020.
Claims priority of application No. 20185661 (FI), filed on Jul. 27, 2018.
Prior Publication US 2021/0308883 A1, Oct. 7, 2021
Int. Cl. B26B 13/28 (2006.01); A01G 3/02 (2006.01); A01G 3/047 (2006.01)
CPC B26B 13/285 (2013.01) [A01G 3/021 (2013.01); A01G 3/0475 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A hand operated shearing tool, comprising:
a first unit comprising a first blade, the first blade comprising a first cutting edge; and
a second unit comprising a second blade and a handle engaged with the second blade at a proximal end of the second blade, the second blade comprising a second cutting edge, wherein:
the second unit is connected rotatably to the first unit about a first rotational axis defined by a first pivot, the first pivot comprising a first pin penetrating the first blade and the second blade;
the first pin is connected to the first blade so that displacement of the first blade in relation to the first pin in a direction parallel with the first rotational axis is prevented;
the second unit is arranged to be rotated in relation to the first unit about the first rotational axis between an open position of the shearing tool and a closed position of the shearing tool;
at least one of the first blade and the second blade is curved and the first blade and the second blade are biased against each other so that the first cutting edge and the second cutting edge are in constant contact at a cutting edge contact point when the hand operated shearing tool is moved between the open position and the closed position,
the handle is connected to the second blade so that rotational movement of the handle in relation to the second blade about a second rotational axis is allowed;
the second rotational axis is defined by a second pivot interacting with the second blade and the handle and being arranged at a distance from the first rotational axis in a direction away from the cutting edge contact point;
the first pin is arranged to penetrate the handle through a through hole arranged in the handle;
a diameter of the through hole is greater than a diameter of the first pin for allowing movement of the handle in relation to the second blade in a direction transversal to the first rotational axis;
the through hole has a frusto-conical shape at the end of the through hole opening in a direction away from the second blade;
the first pivot comprises a frusto-conical shape arranged coaxially with the first pin for interacting with the frusto-conical shape of the through hole;
as a result, the handle is arranged to exert a compressive force to the second blade due to a shearing force between the handle and the second blade when the shearing tool is moved from the open position towards the closed position; and
due to the compressive force, the second blade is driven towards the first blade at the cutting edge contact point for increasing the cutting capacity of the shearing tool.