Abstract: A vacuum appliance is disclosed, comprising a collection canister and a powerhead housing a motor and impeller assembly for establishing vacuum pressure within said canister. In one embodiment, the appliance is of the wet/dry variety. A filter assembly comprising a rigid filter cage around which a filter is disposed. The filter cage is supported on an underside of the powerhead and extends into the collection canister such that the bottom of the filter assembly is at or substantially near the bottom of the collection canister. As a result, deflection of the collection canister as a result of vacuum pressure built up in the canister is resisted by the rigidity of the filter cage. In one embodiment, a frame within the powerhead serves the dual functions of supporting the motor and defining one wall or surface of an impeller chamber in which an impeller rotates to create the vacuum pressure.

Abstract: A dust collection tester of a vacuum cleaner for conveniently cleaning by vacuum absorption floors, carpets, sofas, etc.

Abstract: The present invention relates to a suction cleaning device which provides liquid dispensing, scrubbing, squeegeeing, and suction drying in a single, compact, self contained device. The suction cleaning device includes a cleaning device housing, a handle connected to the housing, an absorbent cleaning member mounted on the housing and movable between an extended and a retracted position, and a pair of squeegee blades. The squeegee blades are mounted in a squeegee tray, and at least one of the squeegee blades is movable between an extended and a retracted position in response to changes in the relative angle between the housing and the surface being cleaned. The movable squeegee blade is spring-biased into the extended position by one or more springs such as leaf springs. The device includes a suction system which draws the water from the floor surface which has been cleaned into a tank mounted on the housing which collects the liquid from the floor surface.

Abstract: A vacuum cleaner handle is provided which offers improved ergonomic characteristics by providing a grip portion which is rotatably mounted and may be offset from the center line axis of the cleaner head.

Abstract: A tube shaft (14) for a vacuum cleaner having an upper end and a lower end. The upper end is connected to a tube handle (15) or the like communicating with a vacuum source and a particle separating means. The lower end is connected to a nozzle (13). The tube shaft (14) includes at least two sections (17,18) arranged telescopically with respect to one another and the parts of the sections which are telescopically arranged with respect to one another are curved.

Abstract: In a conventional grommet, that portion of a tapering, reduced-diameter portion, extending from an insertion hole of a minimum diameter to an insertion hole of a maximum diameter, is linearly varying. Therefore, when enlarging the diameter of the reduced-diameter portion, a large diameter-enlarging force is required, and the efficiency of the operation is low. A grommet 21 of the invention includes a mounting base portion 27 of a different-diameter tubular shape having a larger outer-diameter portion 23 at one end thereof and a smaller outer-diameter portion 25 at the other end thereof, and an annular groove 31 for fitting on a peripheral edge of a hole, formed through a panel of a vehicle, is formed in an outer peripheral surface of the larger outer-diameter portion 23, and the interior of the mounting base portion 27 defines a passage space 29 for a wire harness.

Abstract: A wall-mountable curtain rod bracket has two holders for supporting the ends of two respective curtain rods over two adjacent panels of a bay window. Each holder is pivotally mounted on the end of sleeve which is telescopically and rotatably mounted on a segment of an L-shaped rod, which is pivotally mounted on a wall anchor. Set screws are provided for locking all parts after they are pivoted and telescoped to their desired positions.

Abstract: The adjustable clutch hinge assembly includes a shaft, an adjustment member connected to one end of the shaft, a metal inner cone member, and a metal outer cone member. The end of the shaft to which the adjustment member is connected is inserted into an aperture in the inner cone member, which is split, to allow a decrease of the internal diameter thereof, and has protruding key features, such that a threaded portion of the adjustment member protrudes out the opposite end of the inner cone member. The inner cone member resides within the outer cone member, which has receptive features for the inner cone member and its protruding key features to prevent rotation of the inner cone member within the outer cone member. When the threaded portion of the adjustment member protruding out the end of the inner cone member is drawn through the outer cone member, an outer surface of the inner cone member is forced against an inner surface of the outer cone.

Abstract: Disclosed is a carrying handle mechanism for a portable equipment which has a shaft disposed on a body of the portable equipment and having a first engageable portion and a second engageable portion, the shaft arranged to be forwardly/backwardly slidable with respect to the body; a carrying handle fixed to the shaft; and a lock mechanism which includes a control member which is arranged that the control member may be engageable with the shaft under a predetermined pressing force at all times and the control member is engageable with the first engageable portion when the carrying handle is in an accommodated position, and the control member is engageable with the second engageable portion when the carrying handle is in a pulled-out use position.

Abstract: A handle for a manually movable vehicle or other article, such as a stroller, is infinitely adjustable to enable the person or persons imparting motion to the vehicle to achieve the greatest leverage and/or comfort. A height-adjustment assembly is disposed between and interconnects each extension rod and handlebar of the handle. The height-adjustment assembly includes a plurality of clutch plates and a locking lever having a cam end. The locking lever is manually moved between a locked position in which the lever cam end causes abutment of and friction between the clutch plates thereby preventing relative movement of the plates and securing the handlebar at a selected height, and an unlocked position in which the lever cam end reduces friction between the clutch plates so that the plates are movable relative to one another to enable pivotal movement and height adjustment of the handlebar.

Abstract: A device and process for dividing a pneumatic flow of fiber into a plurality of streams of pneumatically-conveyed fiber which aid in distributing the fiber more uniformly across an area such as a fiber bin.

Abstract: A flat of a revolving flat card is provided with a clothing the points of which are subdivided into groups. The flat preferentially presents an area provided with clothing of a length of more than 1000 mm. The groups each may present a "heel", or a clothing plane each respectively, facing the main drum. The groups can be formed by respective clothing strips (flexible clothing) fastened on a support member to extend in the longitudinal direction thereof, or by saw tooth wire strips (metallic card clothing) arranged side by side and extending in transverse direction of the flat.

Abstract: Fixed adjustable carding element for textile fibre carding and opening machines consisting of a support structure which contains and guides in the radial direction a movable element which supports the carding clothing.

Abstract: A training restraint having double loops formed of two separate, flexible straps joined together by an interlocking cover is extremely strong, tamper resistant and more easily molded than single strap devices. The restraint is designed to be folded into a compact storage position which can be easily carried by law enforcement personnel yet is instantly ready for use. The restraint is designed for repeated use and is provided with indicia to identify the device for training purposes.

Abstract: A loop fastener well-suited for attaching tags to articles of commerce. In one embodiment, the loop fastener comprises a flexible filament having a first end and a second end. In addition, the loop fastener comprises a socket, the socket having a top surface, a bottom surface and a side surface, the side surface being generally octagonal in shape and having a front end. The socket is also shaped to include a channel and a circumferential flange, the channel being generally circular in transverse cross-section and extending from the top surface to the bottom surface, the flange extending partially into the channel and being shaped to include an arcuate surface extending convexly downwardly from the top surface. The first end of the flexible filament is joined both to the top surface and the front end of the socket, the flexible filament extending away from the socket generally perpendicularly relative to the channel.

Abstract: A device for handling or storing bundled items such as electrical cords or cables is provided by using a handcuff-like element having jaws that self-sustain an open position while the bundled item is inserted therein and which traverse a fixed path or trajectory to close on the bundled item. The device may also be used handling or storing key rings, belts, fabrics such as napkins, jewelry, shopping bags, and plantings, among other applications.

Abstract: The present invention is a container for storing fine particles such as bakery flour in a sealed packaging, wherein air in the container such as entrapped during filling can be expelled through compression without loss of the fine particles. The container comprises a main body forming a pouch, terminating in a principal opening, fabricated from an imperforate flexible material such as clear plastic film, a sealing mechanism attached to the pouch for sealing the pouch, and a multiplicity of microscopic pores extending through the flexible material having a dimension ranging from 10 to 150 .mu.m) sufficient to permit air to exit through the exit port, but to prevent the fine particles from escaping through the pores.

Abstract: A spring clip has a first and second retention member. The first retention member retains a first part to the spring clip. The second retention member retains the spring clip in a second part. The second retention member provides for retention in a first and second position. In the first position, the first and second parts are in an engagement position and in the second position, the retention member enables servicing of the first part while still connecting the first and second members.

Abstract: The child seatbelt assembly is provided on-site as a single piece and includes two nylon web seatbelt portions which latch to each other by way of a releasable buckle. Both seatbelt portions are permanently affixed to strap retainers by means of sewing or attaching permanently through the seatbelt portions or through a sew-tab included as part of the strap retainers. This provides that the seatbelt portions are affixed to the strap retainers regardless of whether or not the strap retainers are in the open or closed position. This further allows the child seatbelt assembly to be provided to an installation site, such as a grocery store, as a single assembly.

Abstract: A magnetic closure with a casing made of nonferromagnetic material, for bags, items of clothing and the like, comprising a container which can be coupled to one of two mutually opposite flaps to be joined and forms a seat for at least one ring made of magnetic material. The container is thinner at a coupling surface of the ring. There are also provided elements to increase the tearing resistance of the magnetic ring in the container.

Abstract: A double clip is comprised of outer and middle jaws pivoted together about an outer axle and biased to a closed position by a first spring. A pivoted gripping member is pivoted to the distal end of the outer jaw. An inner jaw is pivoted to the middle jaw about an inner axle and biased to a closed position by a second spring. The clip is removably attached to clothing by clipping the clothing between the inner and middle jaws. An item to be carried is removably clipped between the outer and middle jaws. The pivoted gripping member is automatically maintained in a parallel relationship with the middle jaw, regardless of the thickness of the item.

Abstract: The strap retainer includes a relatively rigid post element with one end formed integrally with a relatively flexible strap element. The free end of the post element includes parallel stabilizing channels and a central detent channel which receive parallel stabilizing prongs and a central detent channel on the free end of the strap element. The detent channel includes detent protrusions with forward ramps to deflect the detent prong upon initial insertion, and further includes rearward ramps to detent engage lateral ramped surfaces on the detent prong after the detent prong has ramped over the detent protrusions and returned to an undeflected position.

Abstract: A fabric roll letoff for unrolling and inspecting a fabric roll. The apparatus includes: a continuous belt for supporting the fabric roll. A drive system for rotates the belt to letoff the fabric web. The drive system includes a drive roller; a idle roller; and a tension roller. The continuous belt rotates the fabric roll to unroll the fabric web at a constant velocity for subsequent processing. In the preferred embodiment, a pair of unloader arms is connected to the belt drive for receiving the fabric roll and for positioning the fabric roll onto the belt drive. Also, in the preferred embodiment, a guide frame is positioned downstream from the belt drive for directing the fabric web through an inspection area.

Abstract: A casket includes a casket shell and a handle bar. The casket includes a side wall with a plurality of external hardware bosses formed integrally and contiguously with the side wall and protruding outwardly therefrom. Each hardware boss is generally hollow and formed to define an interior region that is at least partially bounded by a respective protruded wall offset outwardly from the side wall. A respective first transition wall integrally connects the side wall and respective protruded wall, and a respective second transition wall spaced from the first transition wall and integrally connects the side wall and respective protruded wall, each of the first and second transition walls being formed to include a handle-receiving void, and a handle bar extending through the voids.

Abstract: A low-temperature sinterable dielectric composition with a high dielectric constant wherein x=2-4 mol %, y=0.5-3.0 mol % and z=3-5 mol % in [95PMN-5PT]-x(PbO)-y(CaO)-z(CuO).

Abstract: The method for removing used elastomeric covers from rollers is performed by approaching a rotating cutter head having a number of cutting tools mounted on an indexable insert holder from one end of the cover of the rotating roller to close to the roller core, and moving said cutter head along the rotating roller to the other end of the cover, the circumferential velocities of the cutting tools being from 15 to 70 m/s, preferably from 40 to 50 m/s. For elastomers of up to about 90 Shore A, annular cutting tools are used.

Abstract: A wiring harness producing apparatus is provided which has an excellent space efficiency and a simple construction, and is capable of easily and efficiently producing a wiring harness. There are provided a wire feeding unit 21 for feeding a plurality of wires 11, a wire aligning unit 23 for aligning the respective wires 11 in parallel with each other, and a wire arrangement table 24 for linearly arranging the wires 11 aligned in parallel with each other. On the wire arrangement table 24, a connector connecting unit 26 for pressingly connecting a connector 25 with the respective wires 11, a wire lifting unit 28 for lifting the wires 11, circuit length adjusting units 29 each including a wire length adjusting tool 14 formed with steps 15 with a specified inclination which are brought into pressing contact with the wires 11 to set different loosened lengths for the respective wires 11, and a connector fixing unit 27 for fixing the connector 25 are provided along a wire feeding direction P.

Abstract: The burnishing tool has a shank that is mountable in a hand drill chuck. An end of the shank is received in a bore in an inside member with a conical inside burnishing surface. A transverse shaft passes through a slot through the inside member and a bore through the spindle to connect the inside member to the shank and to permit limited axial movement between the inside member and the shank. A cup member with an outside conical burnishing surface has a hub that receives a post on the inside member. The transverse shaft that connects the inside member to the shank also passes through a bore through the hub to secure the cup member to the shank. The connections between the shank, the inside member and the cup member permit movement of these members relative to each other to align the conical burnishing surfaces with pipe surfaces. The burnishing tool for two pipe diameters has a shank with a first conical burnishing surface on a shank.

Abstract: The apparatus takes coil springs and sequentially forms fabric pockets around the coil springs to form a string of pocket coil springs. It includes a system for forming a length of folded fabric for movement on a frame, a split cylinder which moves to an inclined position to receive a coil spring and then to a generally vertical position to locate the coil spring on a support member and to allow a compressing member to extend through the gap of the split cylinder to compress the coil spring. An inserting device is employed to insert the compressed coil spring between the folded layers of the length of folded fabric which then is moved on the frame to bonding units to allow an edge bond and transverse bonds to be made to form a pocket around each coil spring. The bonding units includes of two stationary ultrasonic bonding devices fixedly located below the length of folded fabric with movable anvils located above the length of folded fabric which are employed for carrying out the bonding operations.

Abstract: This invention relates to an arrangement for sealing a closed chamber in which equipment is to be replaced and especially to a chamber in which equipment is to be replaced while the chamber is to be maintained closed. The arrangement includes a channel filled with a fluid, such as water, and a skirt arranged to extend into the fluid to form the seal. As the skirt extends down into the liquid, a portal space is formed at the opening in the chamber and the opening preferably includes a gate for closing the chamber from the portal space and the outside.

Abstract: A screw with replaceable threads is particularly useful to releasably join the spiders of rotational molding machines. The screw comprises a master bolt that passes through a first spider, and a tip that is removably assembled to the master bolt. The tip is threaded to selectively engage and disengage a receiver on the second spider. When the tip is assembled to the master bolt, the screw is captured in the first spider. When the tip has worn through use, it can be replaced without disturbing the master bolt. Similarly, when the tip seizes to the receiver, the tip and receiver are replaceable as a unit without disturbing the master bolt.

Abstract: An apparatus and method for manufacturing laminated parts from a plurality of laminas, in which the laminas for forming the laminated parts are blanked from strip stock material. The laminas and are then cut and stacked to form the laminated part. The apparatus includes a measuring device placed with the die element of the press, for accurately measuring the thickness of successive sections of the strip stock. A controller, such as a computer or a programmable logic controller, receives the thickness value of the strip stock sections from the measuring device. Means are also included which is activated by the controller to provide a compensation adjustment at selected locations upon the strip stock sections to counteract the measured thickness variations, and to control the stack height.

Abstract: A reinforcement ring (10) for rotating bodies, for example commutators, comprises at least one metal ring (12) having a rectangular cross-section and a fiberglass ring (14) having a rectangular cross-section, the metal ring and the fiberglass ring both being connected at their end faces to form a unit.

Abstract: A windshield lift acting between the floor of a vehicle and the inside surface of the windshield with the aid of suction cups to apply an outward force to place the seal which bonds the windshield to the vehicle frame under tension. The peripheral seal can then be easily cut with a knife.

Abstract: After a number of optical fibers are inserted into a tubular member of a shape memory alloy, the tubular member is returned to its memorized shape by heating to reduce a cross-sectional area of a reception space of the tubular member, thereby uniting the optical fibers received in the tubular member. In a modified form of the invention, a number of optical fibers are inserted into a reception space between two tubular members at least one of which is made of a shape memory alloy, and then the one tubular member is heated to be returned to its memorized shape to reduce a cross-sectional area of the reception space between the two tubular members, thereby uniting the optical fibers.

Abstract: Machining method utilizing an apparatus comprising a major C-frame for carrying an upper tooling head and a rotatable minor C-frame for carrying a lower tooling head cantileverly supported away from a body portion of the minor C-frame to provide a throat for receiving a workpiece edge portion while another workpiece portion is positioned between the heads for machining, the minor C-frame being rotated to provide clearance for the workpiece. As a result, a substantially semi-cylindrical workpiece may be machined over its surface without refixturing thereof.

Abstract: Methods of fabricating air-dielectric true-time-delay, continuous transverse stub array antenna. The first method uses conventional machining or molding techniques to fabricate layers of plastic with desired microwave circuit features. The plastic layers are then metalized, assembled (aligned) and joined together, such as by using ultrasonic welding techniques. Readily available metalization and ultrasonic welding techniques exist that may be used. The second method uses sheets of metal, into which microwave circuit features are fabricated, such as by machining. The layers are then assembled (aligned) and joined together, using one of several available processes, such as an inert gas, furnace brazing technique, for example.

Abstract: A pair of hinges can be positioned on an automotive body for assembly fastening purposes, using a manual fixture that includes spaced pegs for locating the fixture in a desired position on the body. Three or more clamps on the fixture can be controlled to automatically clamp the fixture to the auto body after the fixture has been manipulated to a desired position. The process of aligning the spaced pegs with locator holes on the auto body is facilitated by a stabilization pin carried by the fixture. The stabilization pin and the two pegs provide a stable three point support for the fixture while the fixture is being manipulated to align the pegs with the locator holes.

Abstract: There is provided a mounting head for an electronic component-mounting apparatus. A nozzle holder has a plurality of suction nozzles arranged circumferentially about a vertical axis thereof in a manner such that each suction nozzle is capable of projecting from the nozzle holder and retracting in the nozzle holder. A holder support member supports the nozzle holder in a manner such that the nozzle holder can rotate about the vertical axis thereof. Rotation drive means drives the nozzle holder for rotation in normal and reverse directions. The nozzle holder is driven for rotation by the rotation drive means to bring one of the suction nozzles selected for use to a projecting position. The selected one is caused to project from a lower end face of the nozzle holder at the projecting position. A plurality of cam followers are mounted at respective upper portions of the suction nozzles. The cam followers are in contact with an annular end cam in a manner such that the cam flower can move on the annular end cam.

Abstract: A connection terminal portion of a substrate and a terminal portion of an external circuit substrate or a terminal portion of a part are electrically connected together using an anisotropic electrically conducting film. A structure in which a first substrate having a connection terminal portion and a second substrate having a connection terminal portion or a connection terminal portion of a part are connected together with an anisotropic electrically conducting adhesive containing electrically conducting particles, wherein the thickness of the electrically conducting film provided for the connection terminal of the first substrate, the second substrate or the part is smaller than the diameter of the electrically conducting particles. The invention is further concerned with a method of accomplishing the electrical connection.

Abstract: An apparatus for mounting electronic components includes a moving rail for moving a substrate back and forth, a plurality of part feeders disposed along a side of the moving rail, a plurality of transfer head guide rails installed in a direction orthogonal to a moving direction of the substrate along the moving rail, and a plurality of transfer heads fitted to each of the transfer head guide rails for picking up, transferring and mounting onto the substrate the electronic components from the part feeders while moving along the transfer head guide rails. In a method of mounting electronic components, the electronic components are picked up from part feeders disposed along a side of the moving rail by a nozzle of the transfer head which moves along the transfer head guide rail disposed orthogonally to the moving rail, transferred and loaded onto a substrate while the substrate is moved along the moving rail.

Abstract: An anticipation of engineering changes to a multiple-level integrated circuit package, resulting in a significant decrease in the turnaround time required to make engineering changes. After the first pass of the design phase is complete and before manufacture has begun, surplus I/O at different package levels are wired into surplus connections involving all but the highest package level. These surplus connections are reserved for future use when engineering changes become necessary. Once manufacture is complete, the surplus connections can be converted into logical connections by ECing only the highest packaging level with the quickest turnaround time. The surplus connections also provide a means for implementing ongoing incremental engineering changes as they are needed.

Abstract: A method of reducing electromagnetic radiation through an opening for cables for an electronic device and a peripheral employs an electromagnetic radiation shield which is capable of effectively shielding electromagnetic radiation easily regardless of the number of cables and which can easily be attached and removed. A soft, electrically conductive electromagnetic radiation shield cloth is disposed in fully covering relation to an opening defined in a cabinet to allow cables to be connected to terminals of an electronic device unit. The electrically conductive cloth is attached in an electrically conductive fashion to the shielded cabinet so as to be openable and closable with respect to opening. The electrically conductive cloth has a plurality of vertical slits defined therein for passage of the cables therethrough, with a lower side of the electrically conductive cloth being a free end.

Abstract: A connector assembly useful in grounding applications is provided which includes an insulative housing and a conductive ground shell. The insulative housing includes a passage into which a contact and a cable may be inserted, and a passage which provides access to an inserted contact and cable to facilitate electrical and mechanical connection thereof. Passages in the insulative housing are also provided for inserting legs of the conductive ground shell into the insulative housing to electrically engage the ground wire braid of the cable. The insulative housing and conductive ground shell are constructed and arranged so that the various components readily mate with one another.

Abstract: A method of calibrating a component having first and second opposite large surfaces and a peripheral surface which interconnects the large surfaces and which is provided with a recess, includes the steps of placing the component in a calibrating die, thereafter introducing a calibrating slide into the recess, contacting the first large surface by a first die punch and contacting the second large surface by a second die punch for positively positioning the component in the calibrating die by the calibrating slide and the first and second die punches, and then applying a calibrating pressure to the opposite large surfaces of the component by the die punches for deforming the component to effect calibration of the recess to desired dimensions as determined by a thickness of the calibrating slide situated in the recess.

Abstract: A method of manufacturing a catalytic converter for purifying exhaust gases from an internal combustion engine wherein the converter exhibits a monolithic ceramic substrate surrounded by a supporting mat. The method includes the steps of: wrapping the substrate in a sufficient amount of supporting mat material and inserting the wrapped substrate into the metal shell; forming a cylindrical metal shell having an inner surface exhibiting substantially the same curvature as the wrapped substrate; compressively closing the metal shell around the wrapped substrate to an optimized mat density range thereby resulting in the supporting mat exhibiting a substantially uniform and maximum safe compressive stress on the substrate; and, securing together metal shell to provide a gas tight seal and to hold the compressive stress.

Abstract: A microcooling device and a method for its manufacture. The microcooling device has a high heat conductivity, is designed to accommodate electronic components on its exterior surface, and has a channel structure in its interior through which a coolant fluid can flow to carry heat away from the components. The channel structure is formed by a base substrate provided with a plurality of recesses and a cover layer externally covering the recesses, the cover layer being made from an electrically insulating and heat-conducting material, and being such that the electronic components can be mounted directly thereon.

Abstract: A new evaporative cooler solar retrofit kit for taking an evaporative cooler off of an electrical power grid, thus reducing the amount of electrical power supplied by such a grid, and reducing the cost of operating such a cooler. The inventive device includes a solar panel which is mountable on the housing of the evaporative cooler, a dc motor for replacing the existing blower motor, and a dc motor driven pump for replacing the existing pump motor and pump. The solar panel is electrically coupled to the dc motor and to the dc motor driven pump, such that the electricity generated by the solar panel provides the electricity for operating the evaporative cooler. Therefore, the cooler utilizes energy provided by sunlight, which reduces the use of commercially supplied energy. The cooler will operate from sunrise to sunset when air cooling is most required.

Abstract: The invention relates to an improved mattress comprising an inner spring assembly from a used mattress wherein the inner spring assembly has been stripped of its outer covering of ticking and padding material, heat treated to provide stress relief to the components of the inner spring assembly having received only partial stress relief or no stress relief when the assembly was new, and covered with new ticking and padding material. Prior to the heat treatment, the used inner spring assembly has any bent border wires and connecting wires straightened, and displaced components returned to their proper position, and any damaged components replaced with good quality new or used replacement components resulting in the same inner spring assembly structure as when the assembly was new. The resulting mattress has improved load bearing capacity compared to the original mattress when it was new.

Abstract: In manufacturing a rolling bearing, at least one component of an inner ring, an outer ring, and a rolling element is manufactured from an alloy steel comprising 0.05 weight %-0.5 weight % carbon, 0.5 weight %-18 weight % chromium, 1.5 weight % or less silicon, 5 weight % or less molybdenum, 4.0 weight % or less vanadium, 4 weight % or less nickel, and 8 weight % or less tungsten, by subjecting the alloy steel to carburizing, hardening and tempering. The carburizing is carried out by vacuum carburization. In the vacuum carburization, carburizing and diffusion are carried out by introducing an acetylene-based carburizing gas in a hot atmosphere under reduced pressure, followed by hardening and tempering. The use of the vacuum carburization enables carburization with the chromium (Cr) content being 3.0 weight % or more, and even up to 18 weight %, which was difficult to achieve with the conventional gas carburization (pre-oxidation+gas carburizing).