Patent ID: 7387284

Claim:
A fastening mechanism mounted on a suction cup including a receptacle, a pivotal ball provided in the receptacle, the ball having a plurality of recesses formed thereon, a support leg fixedly secured to the ball, and an inclined channel having one end open to the external and the other end in communication with the receptacle, the fastening mechanism comprising: a shank disposed in the inclined channel and having an exposed one end and an other end of the shank inserted in one of the recesses of the ball; and a resilient member disposed in the channel to serve the shank being compressively inserted into one of the recesses of the ball; and the suction cup comprising: a resilient circular plate having a middle projecting post and having an outer threads thereon, a central concave portion on a bottom of the projecting post, an annular flat portion on an outer circumferential portion of the concave portion; a disc including a main body, a spherical receptacle on an upper end of the body, a disc member on a lower portion of the body, an internal space open to both lateral sides of the body, a nut provided in the space, and a central opening on the top of the disc in communication with the space wherein the projecting post passes the opening to threadedly engage with the nut; and an annular pressing member put on the annular flat portion of the resilient circular plate, the pressing member being disposed inside a concave bottom of the disc, the pressing member including an annular member and a plurality of pressing elements on the bottom of annular member, whereby pulling the shank to clear the recess and to compress the resilient member, pivoting the ball by rotating the support leg until a predetermined angle thereof relative to the suction cup is obtained, and releasing the shank to cause the compressed resilient member to expand to push the shank inward to insert in the recess and to fasten the ball.