bar in a second opposite direction a shuttle assembly including a tensioning wheel is interconnected to the stop bar such that the shuttle assembly is axially moveable relative to the stop bar over a limited range of motion a biasing member is configured to bias the shuttle assembly in the second direction application_number US 5607105 A description the present invention will be described with reference to the accompanying drawing figures wherein like numbers represent like elements throughout certain terminology for example u201c top u201d u201c bottom u201d u201c right u201d u201c left u201d u201c front u201d u201c frontward u201d u201c forward u201d u201c back u201d u201c rear u201d and u201c rearward u201d is used in the following description for relative descriptive clarity only and is not intended to be limiting referring to fig1 an illustrative drive chain assembly 10 is shown the drive chain assembly 10 includes a housing 12 in which a pair of sprockets 14 and 16 are positioned a drive chain 18 is looped around the sprockets 14 16 to transfer power from one of the sprockets to the other sprocket to maintain a desired range of slack on the drive chain 18 a chain tensioner 50 is positioned in the housing 12 with a tensioning wheel 110 in contact with the drive chain 18 referring to fig2 and 3 the chain tensioner 50 includes a support body 52 configured to be fixed in the housing 12 in the current embodiment the support body 52 has a plurality of ribs 54 configured to mate with a complementary set of ribs 32 in a retaining block 30 in the housing 12 other means of securing the chain tensioner 50 within.