Abstract: An engine air intake system for an engine-powered working machine includes a lever cover which covers at least a base portion of an operation control lever mounted on an operation handle for operation by a human operator to control operation of at least one of the working machine and an engine of the working machine, a lower cover disposed inside the lever cover so as to define jointly with the lever cover a hollow space, an air intake portion having an air inlet opening and disposed in the lever cover such that at least the air inlet opening is disposed within the hollow space, and a fresh air guide hose interconnecting the air intake portion and the interior of an air-cleaner case.

Abstract: A riding lawn mower having covers for covering the side part of a cutter deck and the side part of a transmission section. The covers have a plurality of small holes formed in a portion facing the side part of the cutter deck. The accumulation of grass clippings on the upper surface of the cutter deck and the transmission section is reduced, and the state of accumulation of grass clippings is confirmed via the small holes.

Abstract: An engine air intake system for an engine-powered working machine includes a lever cover which covers at least a base portion of an operation control lever mounted on an operation handle for operation by a human operator to control operation of at least one of the working machine and an engine of the working machine, a lower cover disposed inside the lever cover so as to define jointly with the lever cover a hollow space, an air intake portion having an air inlet opening and disposed in the lever cover such that at least the air inlet opening is disposed within the hollow space, and a fresh air guide hose interconnecting the air intake portion and the interior of an air-cleaner case.

Abstract: A riding lawn mower having covers for covering the side part of a cutter deck and the side part of a transmission section. The covers have a plurality of small holes formed in a portion facing the side part of the cutter deck. The accumulation of grass clippings on the upper surface of the cutter deck and the transmission section is reduced, and the state of accumulation of grass clippings is confirmed via the small holes.

Abstract: A lawn mower has a machine body, a grass bag detachably attached to the machine body for collecting therein grass clippings, a driving power source mounted on the machine body, a cutter blade driven by the driving power source for rotation to cut grass, and a cutter housing covering the cutter blade. The cutter blade has air lifting sections disposed at opposite end portions thereof for producing carrier air during rotation of the cutter blade. The cutter housing has a grass clipping delivery passage for directing grass clippings to the grass bag with the carrier air produced by the air lifting sections of the cutter blade, and an exhaust air return passage for returning only the carrier air, as exhaust air, from the grass bag to the cutter housing. The grass clipping delivery passage extends in a front-and-rear direction of the cutter housing. The exhaust air return passage is disposed adjacent to and extends substantially perpendicular to the grass clipping delivery passage.

Abstract: Lawn mower includes a cutter housing covering a grass-cutting cutter blade, and a grass bag, detachably attachable to a rear portion of the cutter housing, for collecting therein grass clippings. The cutter housing includes a grass clipping delivery passage for directing grass clippings to the grass bag with carrier air produced by rotation of the cutter blade, and an exhaust air return passage for returning only the carrier air, as exhaust air, from the grass bag to the cutter housing. The exhaust air is caused to flow, through a netted member provided on an upper surface of the grass bag, back into the cutter housing via the exhaust air return passage provided adjacent to, and extending substantially perpendicularly to, the grass clipping delivery passage.

Abstract: A composite material having a carbon matrix, and a titanium-copper alloy dispersed in the carbon matrix and containing 1-80% by weight of titanium and 15.4-99% by weight of copper. The titanium-copper alloy is present in an amount of 2-85% based on a total weight of the carbon matrix and the titanium-copper alloy. The composite material may additionally contain carbon fibers dispersed in the carbon matrix. The composite material is produced by incorporating powder or melt of titanium and copper or copper alloy into a shaped body of carbon.