Patent ID: 7261654

Claim:
An extendable bat comprising a covering member made of foam plastic material, having a front end and a rear end; a tubular core mounted inside the covering member and having a front end, a rear end, an inner wall with a toothed cross section and an annular slot defined in the tubular core near the rear end of the tubular core; a handle adjustably mounted in the tubular core and having a front end inserted into the rear end of the tubular core and a rear end extending out from the rear end of the tubular core; an adjusting device mounted between the handle and the tubular core and having a first locking member and a second locking member, wherein the first locking member has an annular stop formed on and radially extending from the first locking member; a taper head attached to and axially extending from the annular stop; and a stud axially extending from a middle of the taper head and having a thread near the taper head; and the second locking member has a drive loop mounted around the stud and screwed onto the thread on the stud, two semicircular clamps mounted around the drive loop and abutting the tubular core, and each clamp comprising a curved slot defined in a middle of the clamp, a cone-shaped cavity defined in a rear end of the semicircular clamp and corresponding to the taper head; and a toothed outer surface corresponding to and engaging the toothed inner wall of the tubular core, and a resilient ring mounted around the clamps and held inside the curved slots in the clamps to combine the clamps together.