Patent ID: 6890287

Claim:
A collapsible treadmill capable of being automatically secured to a collapsed position, said treadmill comprising: a base; a treadbase pivotably mounted on said base to pivot relatively to said base between an operative position and the collapsed position; a damper having a cylinder and a bar, said cylinder defining a first pivot end and a distal end at two ends thereof and provided with a cylindrical hole inside, said cylindrical hole defining an opening at a free end thereof, said bar defining an interior end for inserted into said cylindrical hole and an exterior end for extending out of said opening of said cylinder at two ends thereof, whereby said bar reciprocates along said cylindrical hole, said cylinder being pivotably mounted to said base at the first pivot end thereof, said bar being pivotably mounted to said treadbase at the exterior end thereof; a sleeve fitted onto said cylinder to reciprocate along the cylinder, an end of said sleeve and the exterior end of said bar being coaxially pivotably mounted to said treadbase respectively, whereby said treadbase drives said sleeve to reciprocate relatively to said cylinder while said treadbase pivots relatively to said base, said sleeve having a stop slot thereon coinciding with a position corresponding to the distal end of said cylinder while said treadbase is at the collapsed position; a locking member pivotably mounted on said sleeve and having a stop lug to be inserted into said stop slot; and a biasing member for providing a resilience to keep said stop lug of said locking member inserted into said stop slot and engaging against an outer periphery of said cylinder while said treadbase is not at the collapsed position and to push said locking member to enable said stop lug to engage against the distal end of said cylinder while said treadbase is at the collapsed position.