Chain guide mechanism

In a chain transmission comprising a driving sprocket, at least one driven sprocket, and an endless traveling transmission chain engaged respectively in driven and driving relationship with said sprockets, a chain guide mechanism, comprising:

• two chain guides in sliding relationship with said endless traveling transmission chain;
• and
• a guide bridge for integrally holding the chain guides;
• wherein each said chain guide has:
• a pair of coaxial cylindrical mounting bosses extending in opposite directions from a mounting portion of the chain guide;
• a chain-engaging guiding surface extending in a first direction from a location adjacent said mounting bosses;
• and
• a chain pressing portion extending in a second direction, opposite said first direction, from said location adjacent the mounting bosses, and positioned in spaced relationship to the chain whereby a gap is maintained between the pressing portion and the chain when the chain transmission is in operation;
• and
• wherein:
• said guide bridge has a base portion, and a pair of arms extending from the base portion;
• each of said arms comprises two opposed, spaced parts extending on opposite sides of the mounting portion of one of the chain guides whereby the mounting portion is disposed between said opposed, spaced parts;
• each of said opposed, spaced parts is formed with a guide mounting hole for receiving a mounting boss on the mounting portion therebetween;
• and
• said base portion of said guide bridge extends from the portion between said arms at a location such that the guide bridge is substantially in the shape of T, and includes a sprocket pressing portion in sliding contact with one of said driving sprocket and said at least one driven sprocket.