Patent ID: 8308098

Claim:
A stepless fastening device comprising: a cap having a driving gear connected to an underside thereof and multiple one-direction teeth located around the driving gear, the cap including multiple arms extending from an outer periphery thereof; an operation unit located beneath the cap and including an operation ring an activation ring and an engaging member; the operation ring of the operation unit including multiple pressing blocks located on an underside thereof and each pressing block including an inclined surface, the operation ring mounted to the arms, the operation ring connected to the underside of the cap and pushing the activation ring away from the cap when the operation ring is rotated in the second direction; the activation ring including a skirt, multiple notches and multiple protrusions, the skirt extended from an underside of the activation ring and the multiple notches defined in an outer periphery of the activation ring, the protrusions extended from a top of the activation ring and contacting the pressing blocks, the activation ring located in the operation ring and the arms of the cap extend through the notches; the engaging member including inclined teeth and pushed by the activation ring so that the inclined teeth are disengaged from the one-direction teeth of the cap, the engaging member including multiple posts and each post having an inclined tooth on a top thereof, the inclined teeth engaged with the one-direction teeth of the cap, each of the posts including a snap piece which extends perpendicularly from the post, the skirt of the activation ring engaged with the snap pieces; a base having a spool which has teeth engaged with the driving gear of the cap, and the operation unit being rotatable in a first direction to rotate the spool in the first direction, the operation unit being rotatable in a second direction to rotate the spool in the second direction.