Patent ID: 8020826

Claim:
A supporting mechanism, comprising: a supporting module and two rotatable modules rotatably positioned on the supporting module, each rotatable module comprising: a pivotal shaft; a rotating washer rotatably sleeved on the pivotal shaft, and having an engaging surface, the engaging surface forming a plurality of protrusions; a stationary washer non-rotatably sleeved on the pivotal shaft, and having a resisting surface facing the engaging surface, the resisting surface defining a plurality of grooves engaging with the protrusions and a plurality of buffering portions adjacent to or in the grooves to receive material flowing from other portions adjacent to the grooves; a resilient member rotatably sleeved on the pivotal shaft and configured to push the rotating washer to resist the stationary washer; and a fixing member preventing the rotating washer, the stationary washer, and the resilient member from detaching from the pivotal shaft; wherein the supporting module comprises a base, a first link bracket, a second link bracket, and two supporting blocks; one end of the first link bracket and the second link bracket are rotatably connected with the base, and the other end of the first link bracket and the second link bracket are connected by the supporting blocks; the shaft is non-rotatably positioned on the supporting blocks; wherein the pivotal shaft comprises a flange, a holding portion, and a shaft portion, the holding portion and the shaft portion are on opposite sides of the flange; each supporting block defines a deformed through hole corresponding to the shaft portion and two pivot holes adjacent to the through hole, the shaft portion is passed through the deformed through hole of one supporting block, a first screw is passed through the through hole of the first link bracket and one of the two pivot holes of one of the two supporting blocks, a second screw is passed through the through hole of the second link bracket and the other one of the two pivot holes of the one of the two supporting blocks, so that the first link bracket and the second link bracket are connected by one of the two supporting blocks.