Patent ID: 8480258

Claim:
A rotation angle regulating device, comprising: a fixing element having a first axis hole with a positioning flange disposed around the periphery of the first axis hole; an active rotating element having a second axis hole with a bump disposed around the periphery of the second axis hole; and N passive rotating elements located between the fixing element and the active rotating element, wherein N is a positive integral equal to or more than 1, each passive rotating element has a through hole, a first stopper and a second stopper are respectively disposed around the periphery on two opposite sides of the through hole, the positioning flange is located on a rotation path of the first stopper of the first passive rotating element, the bump is located on a rotation path of the second stopper of the N-th passive rotating element, the first and the second stoppers of the j-th passive rotating element respectively press against the second and the first stoppers which are located on the i-th and the k-th passive rotating elements adjacent to the j-th passive rotating element, and 1≦i<j<k≦N, i, j, and k are positive integrals; wherein, the passive rotating elements respectively press against the fixing element and the active rotating element through the first passive rotating element and the N-th passive rotating element, and the active rotating element, when rotating, drives and makes the passive rotating elements rotating on the fixing element, such that a rotation angle of the active rotating element relative to the fixing element is increased, and the rotation is stopped at any designated angle through the operations of the first and the second stoppers of each passive rotating element.