Patent ID: 7520361

Claim:
An adjustable wheel support for a vehicle, the vehicle comprising: a power unit; a drive wheel having a drive sprocket attached thereto and having an axle disposed centrally therein; an endless drive loop member connecting the power unit and the drive sprocket of the drive wheel, a wheel support arm supporting the drive wheel on the vehicle and having an adjustment slot formed therein and extending in a front-rear direction of the vehicle; and wherein said axle of said drive wheel is inserted through said adjustment slot; the adjustable wheel support comprising: a tension-adjusting bolt connecting said wheel support arm to said axle, said axle being adjustably movable in a front-rear direction of said vehicle by rotating said tension-adjusting bolt to thereby adjust the tension of said drive loop member; wherein said tension-adjusting bolt is provided with an anti-turn recessed portion, and a lock member elastically engageable with and disengageable from said anti-turn recessed portion, and wherein turning of said tension-adjusting bolt is resisted by engagement of said lock member with said anti-turn recessed portion.