The present invention relates to a pair of scissors comprising two scissor halves connected by means of a hinge member, each half comprising a scissor blade of metal, a ceramic material or the like, and a plastic handle portion connected to the blade, said handle portion forming a tongue positioned on the outer surface of the blade and surrounding the scissor hinge, whereby the hinge member extends from the tongue of one scissor half through holes provided in the scissor blades to the tongue of the other scissor half and is surrounded in at least one tongue by a bearing surface which bears against the hinge member. The invention is also concerned with a mould and a method for the manufacture of scissor halves.
In the manufacture of scissors constructed as described above, blades of metal, a ceramic material or the like are manufactured first, whereafter cutting edges are ground in the blades and they are provided with a hole for the scissor hinge. The blade is thereafter positioned in a space provided therefor in a die-casting mould and is fixed in position with respect to the mould by means of a pin or the like which goes through the hole of the blade and which is secured to the mould surfaces. This blade space communicates with a mould cavity for the handle portion, which cavity is filled with a fluid plastic material during the manufacture of the scissor half, whereby the plastic material partially surrounds that end of the blade which is adjacent the hinge so that the blade is fastened to the handle portion. Finally, two scissor halves are connected with each other by means of a screw or a rivet which goes through a boring formed by the mould pin through the scissor blades and the tongues of the handle portion.
Since the mould pin, which forms the boring, equals in diameter with the hole of the scissor blade, the holes of the scissor blades are fixed in the right position with respect to the mould and the plastic loop of the handle portion so that the two parts of the boring will be positioned in alignment, which, of course, is necessary in order that the hinge member could be passed into the boring.
It is generally known that the position of the hole in a scissor blade varies within certain limits. This implies that the distance between the center of the hole and the point of the scissor blade as well as between the center of the hole and the cutting edge of the blade varies from blade to blade. When two scissors halves are connected with each other to form a pair of scissors, it often turns out that the points of the blades protrude to different extent and/or the points do not make contact as required when the scissors are closed. The disadvantages are nowadays eliminated by means of a manual finishing, whereby the longer point can be ground shorter and, correspondingly, the position of the mutual stop faces of the handle portions are adjusted. These steps, however, must be carried out manually, wherefor they greatly affect the price of the scissors.