Patent ID: 7381155

Claim:
A wrist exerciser, comprising: upper and lower casing members, which are hollow members and are releasably mounted to each other to define a receiving space therebetween, the upper casing member forming an opening; a rotor rotatably received in the receiving space between the upper and lower casing members and having opposites sides from which axles extending in opposite directions, the rotor being sized and arranged to have a portion thereof selectively exposed out of the upper casing member through the opening; an outer ring arranged along a circular flange of the lower casing member and defining two holes to rotatably receive the axles of the rotor respectively; a resiliency device coupled to the ring at a location corresponding to one of the holes of the ring to selectively build up and release a spring force; and a movable catching mechanism coupled to one side of the rotor and in operative coupling with the resiliency device whereby by applying a contact force to rotate the rotor, the resiliency device builds up the spring force and whereby by releasing the contact force that rotates the rotor, the resiliency device releases the spring force that acts upon the rotor to provide the rotor with an initial auxiliary starting force.