Gas canister retaining structure for gas-engine-mounted working machine

A gas canister retaining structure for a gas-engine-mounted working machine provided with a gas engine that is supplied with fuel from a cassette gas canister, said gas canister retaining structure comprising:

• a gas canister cover pivotable between an opened position for attaching/detaching the cassette gas canister to/from said gas canister retaining structure and a closed position for accommodating and holding the cassette gas canister in place within said gas canister cover;
• a mouthpiece support section provided inside said gas canister cover for supporting a mouthpiece portion of the cassette gas canister with a jet nozzle of the cassette gas canister received in a nozzle receiving port provided in said mouthpiece support section;
• a shutter member pivotable between an opened position for opening the nozzle receiving port and a closed position, wherein the shutter member is configured to sealingly engage and close the nozzle receiving port;
• and
• an interlocking means that causes said shutter member to be opened/closed in interlocked relation to opening/closing of said gas canister cover,
• wherein the interlocking means allows the shutter member to pivot to the closed position and prevents entry of foreign matter into the nozzle receiving port when the gas canister cover pivots to the closed position, and
• wherein the interlocking means allows the shutter member to pivot to the opened position when the gas canister cover pivots to the opened position;
• and
• wherein said interlocking means includes first and second links that interconnect said gas canister cover and said shutter member, and in which, as said gas canister cover is closed, said first and second links are collapsed so that said shutter member is closed, while, as said gas canister cover is opened, said first and second links are expanded so that said shutter member is opened;
• wherein the first link is pivotably provided on said gas canister cover and the second link is pivotably provided on said shutter member, and
• wherein, as said gas canister cover is opened, a guide claw provided on the second link abuts against a driven pin, provided on said shutter member, so that said shutter member is opened, while, as said gas canister cover is closed, the guide claw moves away from the driven pin so that said shutter member is closed by a biasing force of a return spring.