Abstract: A method for the production of a reamer, such as a burr for milling a patient's acetabular cavity, including a substantially hemispherical, hollow cutting body with a perforated wall. The method includes a step of forming at least one tooth by stamping the wall, during which an area of the thinned portion of the wall, adjacent to a hole, is pressed between a punch and an anvil.

Abstract: A method of manufacturing an outer cutter of a rotary electric shaver that includes the outer cutter and an inner cutter which is slidingly in contact with a bottom surface of the outer cutter and rotates, in which a plurality of the circular shaving surfaces are integrally formed in the outer cutter in a concentric manner, and round hole-shaped hair introduction openings are formed in at least one of the circular shaving surfaces includes (a) a step of grinding or polishing a predetermined position where the round hole-shaped hair introduction openings are formed in the circular shaving surface to obtain a thickness size smaller than an inner diameter size of the round hole; and (b) a step of forming the round hole-shaped hair introduction openings in the position where the grinding or the polishing is performed by pressing, after the step (a).

Abstract: A method of manufacturing razor blades from a strip material including reducing the thickness of the strip material by at least 10% and converting the strip material into razor blades.

Abstract: Provided is a movable blade including, at a part including a movable blade leading edge which engages with a stationary blade, a blade edge portion which is thinned toward the movable blade leading edge. The blade edge portion is formed by shaving.

Abstract: Rolling mill shear provided with at least one blade having characteristics of toughness and resistance to thermal shock typical of the family of tool steels for hot shearing and at the same time having sufficiently high characteristics of surface hardness and wear resistance, typical of tool steels for cold shearing. This shear is particularly suitable for carrying out, with greater efficiency and for a longer time, relative to the known shears, the shearing of sections or bars at a temperature between 150 and 800° C., downstream of the Quenching & Tempering heat treatment thereof.

Abstract: A method for making a razor blade having a bent portion is disclosed. The method includes: providing an elongated strip of stainless steel that can be 0.076 mm thick; hardening the strip; providing a cutting edge along an edge of the strip and providing coating(s) on the cutting edge. The stainless steel has a carbon content preferably between 0.45% and 0.55% by weight. The strip is separated lengthwise into discrete razor blades. The bent portion of the razor blade is then formed using a swivel bending process. When the razor blade is bent to define an included angle of 90 degrees between planar regions adjacent the bent portion and an inner surface having a radius about 0.3-0.35 mm, the outer surface of the bent portion is free from macro-cracks.

Abstract: Provided are an outer blade for a reciprocation-type electric shaver and a method of producing the outer blade, the outer blade being capable of suppressing a deformation such as wrinkles or an undulation, without adding a new component, to thereby keep a good appearance thereof. A sheet material for forming the outer blade is bent into a shape projecting upward when viewed in the lateral directions. The sheet material has hair introduction holes, the peripheral edge of each hair introduction hole forming a projection section projecting inward beyond the other portion of the sheet material, the end surfaces of a part of the projection sections make contact with a reciprocating inner blade. The sheet material is formed with a deformation suppression section in a specific region not including the projection sections which make contact with the inner blade but including the projection sections which make no contact with the inner blade.

Abstract: A method of making razor blades from a strip material includes offsetting and flattening steps.

Abstract: A biopsy device having a cannula with a distal tip is disclosed. The distal tip includes a blade, and can be a unitary metal injection molded component including a base and a blade. The blade can have a hardness of at least 40 HRC. The blade can be hardened, polished, and then honed to provide a sharp leading edge.

Abstract: An object of the invention is to provide a blade for cutting a copper foil being capable of further decreasing the amount of slivers generated at the time of processing, e.g., cutting, punching, and perforating a copper foil and also capable of making the size of the slivers smaller. To achieve the purpose, a disk-like blade to be employed for a copper foil-slitting apparatus is coated with diamond-like carbon (DLC) or diamond-like carbon soft (DLC-soft) on at least a part to be brought into contact with a copper foil at the time of cutting. The coating reduces the unevenness of a blade surface, thereby providing a face being scarcely scratched with the copper foil. Subsequently, the amount of the slivers generated is remarkably decreased and the cutting property is improved.

Abstract: In accordance with the present invention, a plurality of circular shaped, slotted foils or cutting heads are simultaneously produced using electroforming production techniques followed by passage of each slotted foil or cutting head through either a single die or a progressive die to form the slotted foil or cutting head into the desired three-dimensional circular or annular shape required for a rotary shaver. Furthermore, in order to produce a slotted foil or cutting head which is extremely thin, to attain a close, comfortable shave, each of the fully formed slotted foils or cutting heads is passed through an insert molding operation, wherein a supporting rim or ring is affixed to the outer edge of the slotted foil or cutting head, thereby imparting rigidity or stiffness thereto. As a result, slotted foils or cutting head are able to be manufactured at a substantially reduced cost, and with precisely desired and controlled configurations.

Abstract: A cutting edge is formed by build-up welding on a die of a die assembly made of a base material of an aluminum/copper-based zinc alloy. The cutting edge comprises an underlying layer and an overlying layer. The underlying layer is made of a copper alloy that can be welded to both a zinc alloy and a nickel alloy, and the overlying layer is made of a nickel alloy. The cutting edge is of high machinability, high durability, and high hardness.

Abstract: A method for forming a blade having circular apertures with sharpened edges. As opposed to the traditional grinding and deburring method, the present invention utilizes electrochemical machining, electrical discharge machining, electrolytic machining, laser-beam machining, electron-beam machining, photochemical machining, ultrasonic machining, and other non-traditional methods to sharpen and form the blade edges. These manufacturing methods lend themselves to produce unlimited razor blade designs and structures.

Abstract: A process for producing a cutting die having a metal base which carries a sharpened ridge extending along a predetermined path thereon, in which a supply of powdered metal and a laser beam are moved along the path so as to surface melt a thin layer of the metal base with the metal powder and thus form a band of fused metal powder along the path, this step being repeated to form additional layers metallurgically bonded to the base and to each other, until a ridge of metal is formed. The ridge is then sharpened to suit it for use in cutting. The ridge may have a top surface of harder material than the inner part of the ridge. The laser and powder delivery movements may be controlled by a CNC (computer numerical control) motion system. The invention includes novel dies produced by this process.

Abstract: A hair-cutting apparatus has a toothed cutting device comprising a stationary cutter with a row of cutter teeth and a reciprocable cutter with a row of cutter teeth, the cutter teeth of at least one of the two cutters are rounded at their distal ends except for the area of their shearing faces and in addition are wholly rounded over their entire tooth depth into the proximal tooth area except for the area of their shearing faces.

Abstract: A shaving system of the wet shave type includes support structure and blade structure secured to the support structure. The blade structure has an aperture with an annular sharpened shaving edge that is defined by main facet portions that converge at an angle of less than 40.degree., and supplemental facet portions that are extensions of the main facet portions and converge at an included angle of less than 60.degree. to define an annular ultimate tip portion. The annular ultimate tip of the sharpened edge defines a shaving plane and the bisector of the included angle defined by the supplemental facets is disposed at an angle (shaving angle) in the range of 15.degree.-35.degree. to the shaving plane.

Abstract: A cutting element, cutting edge and method of making cutting edges is disclosed. A compound material, preferably containing 30-70 vol % of carbides, nitrides and/or carbonitfides, is co-extruded with a steel cover. The co-extended product is cut into tip blanks whose outer surface corresponds to surfaces of a cutting element body. The steel cover is brazed to corresponding contact surfaces on bodies of a cutting element, e.g., a saw blade, and the cutting edges are ground by removing portions of the steel cover and the compound material.

Abstract: Method and apparatus for opening slits of uneven lengths in the concentric circular shaving sections of an external cutting member that is used in an electric razor using a rotary cutter that cuts the shaving sections of the external cutting member in radial directions as the external cutting member is rotated around its axis by a predetermined angle with a use of an index device. The differences in the length of the slit are obtained by changing the cutting angle of the rotary cutter relative to the external cutting member.

Abstract: A invention relates to tool having working surfaces (5) which transmit torque by application against a workpiece and are provided with particles of friction material (8) consisting of metallic or mineral material, such as quartz and/or diamond chips, attached by metallic embedment, and for optimal development of the working surface for the transmission of torque there is an electroplated metallic base layer (7) for solely surface application of the particles of friction material (8) of an embedment layer (9) for the particles of friction material which is then also electroplated, the thickness (x) of the base layer (7) being less than that of the embedment layer (9) and the thickness (y) of the latter being less than the particle size of the particles of friction material (8).

Abstract: A shaving system that includes a holder and a blade meber secured to the holder. The blade member has an aperture that defines an annular sharpened edge with main facet portions that converge at an angle of less than 30.degree. and supplemental facet portions that are extensions of the main facet portions and define an ultimate tip defining portion that has an included angle of less than 30.degree.. The supplemental facet portions are offset in the same direction from the main facet portions each at an angle of less than 175.degree., the outer main facet portion defines a shaving plane, the ultimate tip is disposed above the shaving plane less than 0.1 millimeter, and the bisector of the included angle defined by the supplementary facets is disposed at an angle to the shaving plane in the range of 15.degree.-35.degree..