A cutter includes a platform, two handles, a blade, a lever, two pawls, a helical spring and a torque spring. The platform is connected to the first handle. The lever includes a ratchet formed at a rear end and a block formed on a side. The blade includes a rear end formed with a slit for receiving the block. The first pawl is pivotally connected to the second handle. The torque spring includes an end in contact with the first pawl and another end in contact with the second handle for keeping a tip of the first pawl engaged with the ratchet of the lever. The second pawl and the handles are pivotally connected to one another. A helical spring includes an end connected to the second pawl and another end connected to the lever. The tips of the pawls are alternately engaged with the ratchet.

A powered shearing mechanism or cutter is disclosed that comprises an asynchronous double class 1 lever and a linear actuator that uses two ganged wheels to pry the effort portion of both levers open and close the jaws. The wheels move linearly—with the distance between them kept constant—and roll along—and exert force against—parts of the levers called “bearing surfaces.” The bearing surfaces are non-planar and reflectively symmetric and their profile is customized to provide any desired ideal mechanical advantage for the cutter. In accordance with the illustrative embodiment, the profile of the bearing surfaces is a circular arc, which provides a bearing surface which is easy to precisely fabricate and that provides a fairly constant ideal mechanical advantage at each point as the cutter's blades cut through the material.

A powered shearing mechanism or cutter is disclosed that comprises an asynchronous double class 1 lever and a linear actuator that uses two ganged wheels to pry the effort portion of both levers open and close the jaws. The wheels move linearly—with the distance between them kept constant—and roll along—and exert force against—parts of the levers called “bearing surfaces.” The bearing surfaces are non-planar and reflectively symmetric and their profile is customized to provide any desired ideal mechanical advantage for the cutter. In accordance with the illustrative embodiment, the profile of the bearing surfaces is a circular arc, which provides a bearing surface which is easy to precisely fabricate and that provides a fairly constant ideal mechanical advantage at each point as the cutter's blades cut through the material.

Scissors including handles and scissors heads. The handles include a first handle and a second handle, and the scissors heads include a first scissors head and a second scissors head. The first scissors head is provided with a first blade and extends from one end of the first handle, and the second scissors head is provided with a second blade and extends from one end of the second handle. The first scissors head is pivotally hinged to the second scissors head via a pivoting structure, and the first scissors head and the second scissors head have a small width to thickness ratio at the connection between the scissors heads and the pivoting structure. The scissors increase the rigidity of the scissors head, enhance the shear-compression intensity of the scissors, facilitate the cutting of thick objects, and meet the requirements of various objects to be operated.

Scissors including handles and scissors heads. The handles include a first handle and a second handle, and the scissors heads include a first scissors head and a second scissors head. The first scissors head is provided with a first blade and extends from one end of the first handle, and the second scissors head is provided with a second blade and extends from one end of the second handle. The first scissors head is pivotally hinged to the second scissors head via a pivoting structure, and the first scissors head and the second scissors head have a small width to thickness ratio at the connection between the scissors heads and the pivoting structure. The scissors increase the rigidity of the scissors head, enhance the shear-compression intensity of the scissors, facilitate the cutting of thick objects, and meet the requirements of various objects to be operated.

A cutter comprises one or more blades, a hinge coupled to the blades, and one or more adjustable handles pivotally coupled to the hinge. When being adjusted, the one or more adjustable handles permit adjusting their positions with respect to the opposing handle without concurrently actuating the blades.

A cutter comprises one or more blades, a hinge coupled to the blades, and one or more adjustable handles pivotally coupled to the hinge. When being adjusted, the one or more adjustable handles permit adjusting their positions with respect to the opposing handle without concurrently actuating the blades.

A shearing tool has a first unit with a first blade, rotatably coupled to a second unit with a second blade, at a first pivot having a first pin, so that displacement of the first blade relative to the first pin in a direction parallel with a first rotational axis is prevented, and the handle is connected to the second blade so that rotational movement of the handle relative 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 at a distance from the first rotational axis in a direction away from a cutting edge contact point. When the shearing tool moves from an open to a closed position, the second blade is driven towards the first blade at the contact point for increasing the cutting capacity of the shearing tool.

A shearing tool has a first unit with a first blade, rotatably coupled to a second unit with a second blade, at a first pivot having a first pin, so that displacement of the first blade relative to the first pin in a direction parallel with a first rotational axis is prevented, and the handle is connected to the second blade so that rotational movement of the handle relative 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 at a distance from the first rotational axis in a direction away from a cutting edge contact point. When the shearing tool moves from an open to a closed position, the second blade is driven towards the first blade at the contact point for increasing the cutting capacity of the shearing tool.

A convertible cutting device (1, 1) comprises a first handle (2, 2) with a first blade (8, 8) and a second handle (5, 5) with a second blade (11, 11), and a conversion device (14, 14) being configured to adapt at least a scissor position and a knife position. The conversion device (14, 14) and the second handle (5, 5) comprise in each case at least one abutment section (15, 15′; 18, 18) being configured to abut against one another when the conversion device (14, 14) is in the knife position and when the first handle (2, 2) and the second handle (5, 5) are in the closed position, whereby the conversion device (14, 14) is retained in the knife position.