Various embodiments disclosed herein related to a hand operated cutting tool. The hand operated cutting tool may include a first cutting member; a first handle coupled to the first cutting member; a second handle having a second cutting member; and a pivot connection pivotably coupling the first handle to the second handle. The first cutting member may include a cutting device that defines a bow-shaped cutting profile, wherein the bow-shaped cutting profile facilitates an acceleration of a cut-point position defined by an interaction of the first and second cutting members as the first and second handles move from a fully open position to a fully closed position.

The present invention relates to a shearing tool such as scissors, comprising first and second cutting members pivotally coupled with each other, and a linkage pivotally coupled to the first and second cutting members, whereby the linkage and one of the first and second cutting members form together a compound lever mechanism. A force applied by an operator onto the shearing tool increases as an output by the linkage, and the increasing force is conveyed to that cutting member so that the cutting power of the shearing tool increase to allow hard-to-cut materials to be cut manually and easily with less effort from the operator.

The present invention relates to a shearing tool such as scissors, comprising first and second cutting members pivotally coupled with each other, and a linkage pivotally coupled to the first and second cutting members, whereby the linkage and one of the first and second cutting members form together a compound lever mechanism. A force applied by an operator onto the shearing tool increases as an output by the linkage, and the increasing force is conveyed to that cutting member so that the cutting power of the shearing tool increase to allow hard-to-cut materials to be cut manually and easily with less effort from the operator.

Hairdressing scissors include a pair of blade bodies each having a blade portion, a middle portion, and a handle portion in turn from a tip side. The handle portion includes first and second press-formed bodies each in the shape of a flat plate and facing each other along an axial center of a pivot to extend parallel to each other along a longitudinal direction of the blade body; and cylindrical collars and first and second resin materials configured to bridge the first and second press-formed bodies. The first press-formed body includes an extension portion extending toward an associated middle portion further than the second press-formed body to be connected to the associated middle portion, and the second press-formed body is spaced apart from the associated middle portion.

Hairdressing scissors include a pair of blade bodies each having a blade portion, a middle portion, and a handle portion in turn from a tip side. The handle portion includes first and second press-formed bodies each in the shape of a flat plate and facing each other along an axial center of a pivot to extend parallel to each other along a longitudinal direction of the blade body; and cylindrical collars and first and second resin materials configured to bridge the first and second press-formed bodies. The first press-formed body includes an extension portion extending toward an associated middle portion further than the second press-formed body to be connected to the associated middle portion, and the second press-formed body is spaced apart from the associated middle portion.

A composite coating is provided for a tool. The tool can be a pair of scissors or a screwdriver for example. The tool is made with at least one contact face. The composite coating includes diamond grains and layer of metal oxidant. The metal oxidant is used as catalyst to secure the diamond grains to the contact face.

Shears configured with blade pieces having pin holes, at least one of which is polygonal, along basal ends of the blade pieces, and a pin-hole swivel pin, and provided with grooves on either of opposing inner-side faces of the blade pieces. When the shears are in a predetermined open/close state, the grooves lead from the pin holes to the blade pieces' exterior. The pin is constituted by a columnar pin shank ending in cap portions. Rotatable, the pin shank interiorly contacts the polygonal pin hole's sides. The cap portion along the at least one blade piece having the polygonal pin hole has an opening interconnecting a gap between the pin hole and the pin shank with the cap portion's outer side. The grooves, the pin-hole/pin-shank gap, and the opening secure washing-fluid or air channels for cleaning out the pin holes, and realize a light, jiggle-free operational feel.

Shears configured with blade pieces having pin holes, at least one of which is polygonal, along basal ends of the blade pieces, and a pin-hole swivel pin, and provided with grooves on either of opposing inner-side faces of the blade pieces. When the shears are in a predetermined open/close state, the grooves lead from the pin holes to the blade pieces' exterior. The pin is constituted by a columnar pin shank ending in cap portions. Rotatable, the pin shank interiorly contacts the polygonal pin hole's sides. The cap portion along the at least one blade piece having the polygonal pin hole has an opening interconnecting a gap between the pin hole and the pin shank with the cap portion's outer side. The grooves, the pin-hole/pin-shank gap, and the opening secure washing-fluid or air channels for cleaning out the pin holes, and realize a light, jiggle-free operational feel.

Adjustment device for automatic adjustment of a spacing between a first and a second cutting blade. The adjustment device includes a connector extending through a recess in the respective first and second cutting blades at right angles to the first and second contact surfaces and arranged to guide the movement of the displaceable cutting blades relative to the other cutting blade. The adjustment device further includes a first stop fixed to one end of the connector and arranged in contact with the outer surface of the second cutting blade, and an adjustment means located at the opposite end of the connector and arranged to apply a pre-tensioning force on the outer surface of the first cutting blade and maintain first and second contact surfaces of the first and second cutting blades in contact.

Adjustment device for automatic adjustment of a spacing between a first and a second cutting blade. The adjustment device includes a connector extending through a recess in the respective first and second cutting blades at right angles to the first and second contact surfaces and arranged to guide the movement of the displaceable cutting blades relative to the other cutting blade. The adjustment device further includes a first stop fixed to one end of the connector and arranged in contact with the outer surface of the second cutting blade, and an adjustment means located at the opposite end of the connector and arranged to apply a pre-tensioning force on the outer surface of the first cutting blade and maintain first and second contact surfaces of the first and second cutting blades in contact.