Abstract: A suction cleaner includes a suction unit for creating a flow of air and a flexible suction hose having a hose inlet at which air may be drawn into the suction hose. The suction hose leads from the suction unit and includes a first hose portion and a second hose portion having a connection to the first hose portion. The second hose portion includes the hose inlet. The suction unit includes a body that at least partially defines a storage volume in which the first hose portion can be accommodated when the first hose portion is in a contracted condition, and from which the first hose portion can be deployed when required. A first roller is positioned within the body and is supported on a first axis that is fixed with respect to the body. A second roller is positioned within the body and is supported on a second axis. The second axis is movable along an arc. A portion of the arc has a focus point positioned on the same side of the arc as the first axis.

Abstract: An apparatus and method to substantially cancel out the opposing torsional forces of the torsion spring of a spiral rod subassembly and the extension spring of a compound spiral rod balance on the carrier element. The extension spring and the rod spiral balance subassembly are parallel, connected at their lower ends to a carrier element and at their top ends either to an upper mounting cap or separately to the wall of the jamb channel. The spiral rod is turned a pre-determined number of times in a direction opposite from that in which the extension spring is turned so that the torsional forces acting on the carrier element from the torsion spring and the extension spring substantially cancel out each other. The balancing out of the counteracting torsional forces eliminates or substantially reduces the friction between the carrier element and the jamb channel.

Abstract: An adjustable hinge block includes first and second complementary members, each defining therein a first and a second slit respectively. The members are adapted to mate with each other such that the first and second slits at least partially align with each other to define a third slit. First and second wing members protrude from the members respectively such that the wing members lie on opposite sides of the third slit when the members mate with each other. The wing members each define therein a first and a second aperture respectively, which first and second apertures are adapted to receive a fastener. First and second side members, each define therein a third and a fourth aperture respectively, such that the third and fourth apertures is adapted to align with the first and second apertures respectively.

Abstract: Hinge pin or part of hinge pin for use when connecting two adjacent modular conveyor belt links of the type where the belt links are provided with projecting eye parts, where the eye parts are provided with a transverse aperture, such that a hinge pin may be inserted through overlapping eye parts through the apertures hingely connecting two adjacent modules, wherein the hinge pin is shorter than the width of the belt links perpendicular to the intended travelling direction, and that the hinge pin has a central section having a cylindrical shape in the axial direction and where the ends of the hinge pin comprises a conical section, said conical section having an outer circumference larger than the axial section of the pin, where the conical section is provided with three or more radially extending slots, where each slot has a depth in the axial direction of the hinge pin being equal to or less than the extent in the axial direction of the conical section, where the width of each slot is such that when the thre

Abstract: A portable electronic device includes a main portion, a display portion and a hinge module. The display portion is pivotally connected with the main portion by the hinge module. A first hinge member has one end secured to the main portion. A second hinge member has one end, pivotally connected with the other end of the first hinge member, and the other end secured to the display portion, wherein the second hinge member comprises a guide slot. A resilient member is disposed around the other end of the first hinge member. The resilient member includes a fastening end and an actuation end. The fastening end is secured to the first hinge member. The actuation end is disposed within the guide slot of the second hinge member. The guide slot is operable to drive the actuation end so as to deform the resilient member.

Abstract: A lamp has multiple arms and multiple hinges mounted between two adjacent arms. The hinge has a stationary leaf, multiple pivot assemblies being mounted in the stationary leaf and multiple brackets being respectively connected to the pivot assemblies and two corresponding brackets are attached to each arm. Each pivot assembly has a shaft and a locking nut being mounted on the shaft and selectively engaging a locking hole of each bracket. Since the locking nuts selectively engage the locking holes of the brackets, an angle between the adjacent arms can be adjusted and fixed. Further, two adjacent arms do not influence each other's position, which is convenient for adjusting.

Abstract: The present invention relates to various embodiments of a reusable handle with a cable tie for carrying a bag. A handle can be connected to an open end of a bag by means of a cable tie to provide a bag carrying system. The present handle generally comprises a body having a hand-grip portion and a strap receiving channel defined therein; and a mounting section attached to the body, the mounting section including a socket defined therein and adapted for receiving a cable tie such that a locking head of the cable tie is held in place within the socket. A distal end of the strap is inserted through the socket, through the strap receiving channel and through the strap receiving opening of the cable tie to form a loop such that the strap is locked within the locking head.

Abstract: A microphone holder includes a rotational shaft capable of fitting into a clamping unit of a holder base through pushing and opening tip ends of bent arms of the clamping unit. The rotational shaft of the microphone holder has, at an outer periphery of the rotational shaft, a plurality of smooth concave portions at different angular positions. The rotational shaft is stably fit into the clamping unit as convex portions of the clamping unit fit into the concave portions of the rotational shaft. An angle of the microphone holder can be adjusted through smooth rotation of the microphone holder accompanied by sliding between the convex portions of the holding unit and the concave portions of the rotational shaft. Thus, noise generated upon the adjusting can be substantially reduced. A user can easily adjust the direction of the microphone only through the rotation of the microphone holder.

Abstract: fastener assemblies, elements for fastener assemblies and methods of making and assembling elements for fastener assemblies, for example for insulation blanket fasteners such as those used on aircraft, may include a formed monolithic metal configuration having first and second side portions with a plurality of panel retaining elements arranged linearly along the side portions. A planar retaining element, for example a disc, may be assembled with the metal portion to form a fastener assembly, such as may be used to retain and insulation blanket. The planar retaining element may include a rolled edge, and if a coated part, may include surface projections to keep adjacent parts from sticking together during the coating process.

Abstract: A hose clamp has a clamp body, operation pieces, an engaging claw, a receiving portion, an arch shaped opening and a slide guide portion. The clamp body is composed of a plate spring member bent into a ring shape. The operation piece has two legs at one end of the clamp body, and has an operation portion at ends of the legs. The operation piece has a leg at the other end of the clamp body, and has an operation portion at an end portion of the leg. The receiving portion is formed on the operation portion and can engage with the engaging claw. The arch shaped opening is formed on the operation portion, and allows the engaging claw to pass therethrough. The engaging claw and the slide guide portion are disposed on one side of the leg of the operation piece. The slide guide portion contacts with the leg in order to make the engaging claw be opposed to the arch shaped opening.

Abstract: A pipe repair clamp which allows a locking plate to slide over a plurality of lugs into position making it easier to close the clamp around a pipe. The pipe repair clamp includes a flexible strap formed into a substantially cylindrical body defining a hollow bore. The strap has a first and second ends which are brought together when the clamp is closed. A thrust plate is secured near the first end of the flexible strap. At least one lug is secured to the thrust plate and extends perpendicular to the thrust plate. The lug plate is secured near the second end of said strap. At least one threaded stud is secured to the lug plate and is used to tighten the clamp closed. A lug cover plate is perpendicularly secured to the lug and the thrust plate and has at least one opening to receive the threaded stud. The lug cover plate also includes a curved end portion covering at least a portion of the lug. A locking plate has at least one opening and is adapted to receive the threaded stud.

Abstract: A piezoelectric element includes a piezoelectric ceramic body containing an internal electrode. The piezoelectric ceramic body is mainly made of a perovskite complex oxide containing an alkali metal niobate-based compound containing at least one element selected from among K, Li, and Na. The internal electrode is made of a base metal material, such as Ni or Cu. The piezoelectric element is produced by co-sintering the internal electrode and the piezoelectric ceramic body. Thus, there is provided an inexpensive piezoelectric element that can be properly used in practice even though it has been fired in a reducing atmosphere.

Abstract: In a strip pack apparatus in which an end portion of a bag being grasped is attached to a tape, a grasper device for grasping the bag holds the end portion from a direction substantially perpendicular to the end portion to be attached to the tape. The grasper device holds the end portion at both sides of an attachment region. In addition, the strip pack apparatus also includes a dewrinkler device for dewrinkling the end portion, and the grasper device grasps the end portion at both sides of the dewrinkler device.

Abstract: A machine for assembling modular markers, in particular markers for identifying electric cables or the like, includes tags and supporting elements. The supporting elements have respective housings designed to accommodate the labeled elements. The machine comprises a mechanism for inserting the tags into the housings.

Abstract: Methods for removing a belt from a telescoping conveyor having a plurality of spaced apart idler rollers in communication with the belt include: (a) translating an idler associated with a telescoping conveyor downward from an operative position to a belt removal and/or belt load configuration while one end portion thereof remains attached to the conveyor frame to thereby allow a conveyor belt to at least partially collapse from an operative configuration; and (b) removing the conveyor belt from the telescoping conveyor after the translating step. Methods of mounting a conveyor belt to a telescoping conveyor include: (a) providing a conveyor belt configured to mount to a telescoping conveyor mechanism; (b) pivoting a first idler roller to an operative fixed position; and (c) translating an idler residing below the first idler roller upward and rearward into its respective operative fixed position to thereby mount a telescoping conveyor belt.

Abstract: Netting chutes suitable for use with manual, automatic and semi-automatic packaging operations to enclose product in netting packaging include chutes with embossed floors.

Abstract: In a flame arrester arrangement which is formed from two metal strips (8, 9) which are wound together to form a disk having an approximately circular outer circumference and of which a first metal strip (8) is a smooth strip and the second metal strip (9) is a fluted strip having defined fluting, the two strips (8, 9), by bearing against one another, forming defined gaps (11) for passage of a fluid and being held in position relative to one another by fixing pins inserted into radial bores (6), the radial bores (6) can be incorporated without deforming the gaps (11) even in the region of the bores (6) by virtue of the fact that bores (6) are incorporated by spark erosion without deforming the fluting formed in the second metal strip, such that the gaps (11) are also present in the region of the bores (6) in the manner defined by the fluting.

Abstract: A method of clinching includes contacting a punch to stacked workpieces and rotating the punch to generate frictional heat in the workpieces, and advancing the punch into the workpieces to form a mechanically-interlocking joint. Rotation of the punch may be stopped prior to advancing the punch into the stacked workpieces. The first workpiece may be formed from a first material and the second workpiece formed from a different, second material. One of the first and second materials may be magnesium or a magnesium alloy. The mechanically-interlocking joint is characterized by the absence of intermetallic compounds, and may be substantially hermetically sealed against passage of fluids and gasses. A hole may be formed in one of the workpieces and, prior to contacting the punch to the workpieces, the hole aligned substantially coaxially with the punch. Forming the mechanically-interlocking joint may include deforming both the first and second workpieces.

Abstract: A method for attaching an aluminum panel to a magnesium panel via a self-piercing rivet. The method includes positioning the aluminum panel and the magnesium panel together with the magnesium panel supported on an anvil having a cavity therein. The magnesium panel is spot heated at the locale of the anvil, and then the self-piercing steel rivet is punched through the steel panel and only partway into the magnesium panel, to displace the magnesium panel into the cavity. The heating of the magnesium improves the ductility so that the self-piercing rivet is accepted without undue strain on the magnesium material. The interface between the steel rivet and the magnesium panel is concealed between the aluminum panel and the magnesium panel to thereby protect the interface between the steel material of the rivet and the magnesium panel from exposure to the environment.

Abstract: A method for joining two components, of which at least one is tubular in shape, more preferably of an exhaust system of an internal combustion engine. The joint can be produced in an easier manner with high quality if a ring-shaped joining element having an outer cone on at least one axial side with its outer cone is axially pressed into an axial end section of the one tubular component, as a result of which the end section of the one component widens along the outer cone when on its axial end of the widened end section and on the joining element a circumferential weld seam is produced and when the other component on an axial end section is joined with the joining element.

Abstract: Double-action clinching includes establishing a first layer on a second layer, and securing the layers between a tool's punch and clinching punch. First layer has less ductility than second layer, and clinching punch diameter is smaller than punch diameter. Layers are secured so: a tool support receives a portion of a second layer surface; clinching punch, slidably positioned in the support, is adjacent another portion of the second layer surface; and punch, positioned opposed to clinching punch, is adjacent a portion of a first layer surface. Pressing the punch into the first layer surface portion forms an aperture through the first layer. Pressing the clinching punch, in a direction opposite to the punch pressing, into the other portion of the second layer surface forces portion(s) of the second layer into the aperture, and forms a micro-interlocking flush-back joint between an aperture side wall and the second layer portion(s).

Abstract: A method of making a catalytic converter includes providing a catalyst substrate having a substrate periphery and a mat support disposed thereon. The method also includes providing a metal shell having a shell wall having a shell periphery and a bore that is configured to receive the catalyst substrate and mat support. It further includes inserting the catalyst substrate and mat support into the bore of the metal shell in slidable engagement therewith. Still further it includes reducing the shell periphery while applying an axial force sufficient to cause translation of the catalyst substrate and mat support relative to the bore until the force reaches a predetermined retention force threshold, whereupon the reducing of the shell periphery and translation of the catalyst substrate is stopped.

Abstract: A method for producing a security layered construction as well as a security layered construction for an identification document (61), particularly for personal identification, having a transponder layer (20) and at least one cover layer (38, 39), the transponder layer being covered using the at least one cover layer to form a seal with the wire conductor positioned interposed, and at least one viewing side (62) of the at least one cover layer or transponder layer being provided with security printing (63).

Abstract: A method comprising: a first process of placing a laminated rotor core in a preheating device to preheat the laminated core; a second process of removing the preheated laminated core from the preheating device and disposing the laminated core between upper and lower dies of a resin sealing apparatus; a third process of pressing the laminated core by the upper and lower dies and liquefying resin material in resin reservoir pots by heating; and a fourth process of ejecting the liquefied resin material from the pots into the magnet insertion holes by plungers inserted and moving vertically in the pots and thermally curing the resin material. The method improves efficiency of resin sealing the permanent magnets in the laminated core.

Abstract: In a resistance change memory (ReRAM) storing data by utilizing change in resistance of a resistance change element, a transistor T, interlayer insulating films, W plugs and the like are formed on a semiconductor substrate. Thereafter, a Pt film serving as a lower electrode of the resist change element is formed and a transition metal film (Ni film) is formed on the Pt film. After that, the surface of the transition metal film is oxidized to form a transition metal oxide film and a Pt film serving as an upper electrode is formed on the transition metal oxide film.

Abstract: A plurality of reference electronic components (M1, M2) marked in advance are identified and recognized, and the positions of the plurality of the reference electronic components (M1, M2) positioned in the vicinity of an electronic component to be taken out (2a) and component arrangement information in a wafer mapping file (MF) stored in a storage device (11f) are used to calculate the position of the electronic component to be taken out (2a).

Abstract: Carbon nanotube columns each comprising carbon nanotubes can be utilized as electrically conductive contact probes. The columns can be grown, and parameters of a process for growing the columns can be varied while the columns grow to vary mechanical characteristics of the columns along the growth length of the columns. Metal can then be deposited inside and/or on the outside of the columns, which can enhance the electrical conductivity of the columns. The metalized columns can be coupled to terminals of a wiring substrate. Contact tips can be formed at or attached to ends of the columns. The wiring substrate can be combined with other electronic components to form an electrical apparatus in which the carbon nanotube columns can function as contact probes.

Abstract: A multilayer circuit board comprises core layers 101 and 102 made of a core material impregnated with resin, resin layers 111 and 112 interposed between the core layers 101 and 102, a wiring pattern 140 embedded in the resin layers 111 and 112. The core layers 101 and 102 have a thickness of 100 ?m or smaller, whereby the entire board can significantly be thinned. Furthermore, the less strong resin layers 111 and 112 are interposed between the hard core layers 101 and 102, whereby the entire board has increased strength.

Abstract: A paste storage portion 10 is made up of a first storage portion 24 and a second storage portion 25 which are arranged concentrically, and a first transfer position 31 where a transfer head 11 transfers a paste adhesive stored in the first storage portion, a second transfer position 32 where the transfer head 11 transfers a paste adhesive stored in the second storage portion 25 and a substrate transfer position 33 where the transfer head 11 transfers the paste adhesives on to a substrate 8 are made to be situated on the same straight line in a first direction.

Abstract: A suspension board with circuit includes a circuit board containing a metal supporting board, an insulating pattern formed on the metal supporting board, and a conductive pattern formed on the insulating pattern; an optical waveguide disposed on the circuit board; and a positioning portion provided on the circuit board in order to position the optical waveguide with respect to the circuit board.

Abstract: A method for efficiently producing a plurality of EAS or RFID tags or inlays that form a label ready for use. The process utilizes a first web of RFID chip straps or capacitor straps that are releasably secured to a liner using only a low tack adhesive and utilizes a second web of coils or antennas which are secured to a second liner. After indexing these two webs, selective heat and pressure are applied to the chips straps or to the capacitor straps to transfer them and electrically couple them to a corresponding coil or antenna. Where both chip straps and capacitor straps are applied to a common antenna, a third web of the additional strap is used in the process.

Abstract: A vacuum bonding tool for pick-and-place and bonding semiconductor chips onto a substrate or onto a previously mounted die to form a die stack includes a shank and a suction part. The shank has a vacuum conduit extending from a first end to a second end of the shank. The shank is adapted for cooperative engagement with the suction part at the second end, and the shank has a plate at the second end to support the suction part. The suction part has a surface for contacting a semiconductor chip during pick-and place operation. According to the invention, the suction part is made of an elastically deformable conductive or non-conductive material. In various embodiments, the chip contacting surface of the elastically deformable suction part flat overall, or is concave, of has a flat central region and concave regions.

Abstract: A method for manufacturing a substrate having built-in components prevents a short circuit caused by the spread of solder or conductive adhesive. Land regions to connect a circuit component and a wetting prevention region surrounding the land regions are formed on one primary surface of a metal foil. Terminal electrodes of the circuit component are electrically connected to the land regions using solder, and an uncured resin is disposed on and pressure bonded to the metal foil and the circuit component, so that a resin layer in which the circuit component is embedded is formed. Subsequently, a wiring pattern is formed by processing the metal foil. The wetting prevention region is a region obtained by roughening or oxidizing one primary surface of the metal foil so as to reduce solder wettability.

Abstract: A method for fabricating a compliant membrane probe for communication with an integrated circuit includes installing an array of conductive structures within a flexible membrane, the conductors comprising a beam structure having a first end and a second end, with each one of the conductors further comprising a probe tip extending from the first end, the probe tip having a throat generally surrounded by material of the flexible membrane and a head at an end of the throat such that the head is disposed at an opposite side of the flexible membrane with respect to the beam structure; and configuring the second end of the beam structure so as to be supported by a first end of the beam structure of an adjacent conductor thereto.

Abstract: A method for coupling a battery within an embedded system is described. The method includes creating a hole extending through a printed circuit board (PCB), inserting a portion of the battery into the hole, and electrically coupling the battery to at least one contact.

Abstract: An automotive engine component and method of producing the same. The method uses dynamic magnetic compaction to form components with non-axisymmetric and related irregular shapes. A die is used that has an interior profile that is substantially similar to the non-axisymmetric exterior of the component to be formed such that first and second materials can be placed into the die prior to compaction. The first material is in powder form and can be placed in the die to make up a first portion of the component being formed, while a second material can be placed in the die to make up a second portion of the component. The second material, which may possess different tribological properties from those of the first material, can be arranged in the die so that upon formation, at least a portion of the component's non-axisymmetric exterior profile is shaped by or includes the second material.

Abstract: There are provided a method for removing a blade ring by pulling out the blade ring smoothly and surely while preventing damage to other components, and a member for removing a blade ring. By using a dummy blade ring, connection plates, and connecting bolts, work for removing and mounting a lower half section of the blade ring is performed. Thereby, work of rotation and the like can be performed while the lower half section of the blade ring and the dummy blade ring are connected to each other in both end portions. Therefore, during the work, the lower half section of the blade ring and the dummy blade ring are prevented from shifting from each other and therefore from interfering with the opposed rotor blade tip, a lower half section of a casing, and the like, thus preventing damage to the tip, distortion of the lower half section of the blade ring and the dummy blade ring, and the like. Consequently, a stator blade ring can be pulled out smoothly and surely.

Abstract: A leveling method for burying an evaporating section of a heat pipe into a thermally conductive seat is provided for an assembly of heat pipe and heat-conducting seat by simultaneously making the evaporating section of heat pipe partially formed into a flat surface when the evaporating section of heat pipe is being burying into the thermally conductive seat. Furthermore, in cooperation with a stamping machine, the leveling method is to make a multiple steps of press-fitting process to an evaporating section of heat pipe under a condition that there is no need to change the stamping die.

Abstract: The invention is a method for producing a heat exchanger assembly including the steps of extruding a plastic and an adhesive from a co-extrusion die into a plurality of tubes spaced from each other with each tube having an adhesive disposed on its exterior surface. A plurality of corrugated air fins are serially fed into the co-extrusion die and spaced from each other by a predetermined space and ejected between adjacent tubes with the corrugations extending transversely between the tubes. The adhesive is then cured to secure the tubes to the air fins. The method proceeds by cutting the tubes at each predetermined space with a guillotine shear to produce a plurality of unified heat exchanger cores. The ends of the tubes of each core are inserted into tube slots in manifolds, and the tubes and manifolds are adhesively secured together to define a heat exchanger assembly.

Abstract: A method for forming a component that transmits torque in an automatic transmission includes forming a workpiece with a hub concentric with and extending along an axis and forming the workpiece with a disc that is integral with the hub and extends radially outward from the hub. A hollow perform cylinder is formed integrally with the disc, located at a radial end of the disc distant from the hub, concentric with the axis, and includes an inner surface and an outer surface. A hollow perform cylinder is flow-formed using a flow-forming mandrel located within the cylinder and having an outer surface formed with gear teeth such that the inner surface of the cylinder conforms to at least a portion of the gear teeth on the flow-forming mandrel.

Abstract: An apparatus for extruding helical teeth in a gear blank includes a press including a die plate and a die base, the die plate being movable along an axis relative to the die base, the die base supporting the gear blank. A mandrel, aligned with the axis and moveable with the die plate along the axis, includes a surface that includes helical die teeth. A servo motor drives the mandrel in rotation about the axis to the required helix angle as the mandrel moves axially relative to the gear blank.

Abstract: Structural panels for use in manufacturing aircraft fuselages and other structures are disclosed herein. In one embodiment, a structural panel configured in accordance with the invention includes a skin and at least first and second stiffeners. The first stiffener can have a first flange portion mated to the skin and a first raised portion projecting away from the skin. The second stiffener can have a second flange portion mated to the skin and a second raised portion projecting away from the skin. At least one of the first flange portion of the first stiffener and the second flange portion of the second stiffener can extend toward the other of the first flange portion and the second flange portion to form an at least approximately continuous support surface to which a frame can be attached.

Abstract: A safety razor blade unit mounted for pivotal movement relative to a razor handle about a pivot axis substantially perpendicular to a blade mounted in the blade unit. The blade unit is biased to a rest position by a magnetic return force generated by a set of magnetic elements. The set of magnetic elements are so disposed that the return force increases as the pivotal displacement of the blade unit from the rest position increases.

Abstract: A head section for a rotary cutting device includes a body portion, a plurality of cutting lines, and a plurality of blades, wherein the plurality of cutting lines are selectively mounted to the body portion without any disassembly of the head section, and the plurality of blades are selectively mounted to the body portion without any disassembly of the head section. Thus, the head section is selectively configurable, without any disassembly of the head section, to hold only cutting blades in a cutting blade configuration and to hold only cutting lines in a cutting line configuration.

Abstract: A folding knife locking mechanism is provided which maintains the open and closed positions associated with the folding knife. A carrier assembly for the locking mechanism for changing the folding knife from the closed to the open position is also disclosed. In one embodiment, the folding knife comprises a carrier assembly for positioning a spherical locking mechanism against the tang of the knife, without the need for scales or other retaining elements typical in prior art knives.

Abstract: A manually-operated hair clipper, comprising a substantially elongated enclosure, which defines at one end a handle and is provided, at the opposite end, with a working head, which comprises a body for supporting a cutting blade assembly and a motor assembly, elements being provided for transmitting motion from the motor assembly to the cutting blade assembly, at least one comb element, which is associated with the supporting body so that it can slide along a direction for approach and spacing with respect to the cutting blade assembly in order to adjust the cutting length, and at least first teeth for stopping the comb element with respect to the supporting body.

Abstract: A pair of scissors which has ring portions foldable from a position 180° with respect to one another to a position where the ring portions are rotated between 90° each and are substantially parallel and adjacent with one another.

Abstract: A shaving cartridge has a housing with at least one blade having a blade edge. The housing has a first guard in front of the blade with a plurality of projections defining a plurality of open slots extending generally transverse to the blade edge. The open slots have a width of about 0.20 mm to about 0.49 mm and a pitch of about 0.40 mm to about 0.85 mm for allowing the free passage of hair during shaving.

Abstract: A cooling fan includes: a hub; a plurality of cooling vanes provided along an outer circumference of the hub; and an annular connector for connecting the cooling vanes. The hub is provided with a through hole that axially penetrates the hub. A first cover on a case for covering an outward side of the cooling fan is provided with a first outer-air intake. A second cover for partitioning between the cooling fan and a crankcase and for covering an inward side of the cooling fan is provided with a second outer-air intake. With this arrangement, even when one outer-air intake (for instance, the first outer-air intake) adjacent to where the cooling vanes are provided is clogged by a large amount of dust generated during operations, the cooling vanes can breathe from the non-clogged other outer-air intake (for instance, the second outer-air intake) through the through hole, thereby restraining reduction in air flow.

Abstract: A muffler includes a muffler body disposed on a lower portion of an engine and a passage that extends upward from the muffler body and is opened in an upper front portion of a chain saw body. Thus, exhaust gas can be discharged forward from the chain saw body, so that exhaust sounds can be dispersed forward. Consequently, the exhaust sounds propagated to an operator can be reduced and therefore a work environment can be improved. Also, since exhaust gas is discharged after the exhaust gas passes through a long passage extending upward from the muffler body, the exhaust gas can be cooled down. Accordingly, in the chain saw body typically covered with a synthetic-resin case in which exhaust outlets are formed on positions corresponding to outlets of the passage, peripheries of the exhaust outlets can be prevented from being discolored by heat of exhaust gas.