Patent ID: 6757978
Filing Date: 2004-07-06
Classification: B26B,B26D

Abstract:
A pair of scissors for angularly cutting a sheet stock comprising:an upper handle unit of U-shape, the upper handle unit comprising a forwardly projecting, channel-shaped arm, forward apertures, and intermediate apertures; a lower handle unit of U-shape, the lower handle unit comprising a channel-shaped forward arm having forward apertures, rivet apertures to the rear of the forward apertures first apertures below the rivet apertures, and oblique slots to the rear of the first and the rivet apertures; a blade comprising a cutting edge, a first aperture, and a rearward rivet aperture; a board of sector-shape comprising a flat top, a lower ridge having a rear projected end, an elongate slot to the rear of the ridge, and an aperture in a forward of the ridge; a pair of fasteners each having an enlarged head and a shank; and an elongate, resilient piece disposed in the upper handle unit; wherein the forward apertures of the upper handle unit are aligned with the aperture of the board after placing the ridge in the arm of the upper handle unit with the flat top supported on the arm of the upper handle unit, the first pins are inserted through the forward apertures of the upper handle unit and the aperture of the board to cause the board to pivot about the upper handle unit, a second pin is through the first apertures of the lower handle unit and the elongate slot with the head of the second pin urged against on of the first apertures of the lower handle unit, a rivet is inserted through the rivet apertures of the lower handle unit and the rivet aperture of the blade for fastening, the first aperture of the blade is aligned with the intermediate apertures of the upper handle unit, after placing the arm of the lower handle unit in the arm of the upper handle unit and placing the blade in the arm of the lower handle unit are inserted third pins through the forward apertures of the lower handle unit, the intermediate apertures of the up per handle unit, and the first aperture of the blade, the shanks of the pair of fasteners are inserted into the oblique slot, and the heads of the pair of fasteners are slidably urged against the oblique slot; the lower and upper handle units are operative to close toward each other by pivoting about the third pins, the board and the cutting edge close on the sheet stock to be cut on top by pivoting about the first pins in response to pivoting the upper handle unit, the flat and the lower handle unit, a rear end of the elongate slot contacts the second pin as the pair of fasteners have slid to a lowest point in the oblique slot so that the ridge is prevented from further rearward movement with energy stored in the resilient piece; the stored energy of the resilient piece is applied on the blade to expand the lower and the upper handle units away from each other, and the cutting edge and the flat top pivot about the first and the third pins respectively to open an opening therebetween, a forward end of the elongate slot contacts the second pin, and thus forms a gap between a forward end of the blade and that of the flat top; wherein a cutting operation presses lower and the upper handle units against each other for causing the board and the blade to close on the sheet stock, the ridge pivots in response to pivoting the lower handle unit, the second pin slides along the elongate slot to move the ridge, a rear portion of the flat top moves upward, and a pointed end of the blade closes on a forward end of the flat top.