Patent ID: 8610666

Claim:
A wheel module for an input device, said wheel module comprising: a circuit board, wherein at least one switch element is installed on said circuit board; a wheel swinging member disposed over said circuit board, so that said at least one switch element is arranged between said circuit board and said wheel swinging member; a wheel disposed on said wheel swinging member and rotatable relative to said wheel swinging member, wherein said wheel has a vacant structure, and a plurality of indentations are formed in an inner surface of said vacant structure; and a stopping arm comprising a contacting part and a poking part, wherein when said poking part is moved to allow said contacting part to be accommodated within one of said indentations, said wheel is non-rotatable, wherein by titling said wheel in a specified direction, said wheel swinging member is swung relative to said circuit board to trigger said at least one switch element, wherein said at least one switch element comprises a first switch element, a second switch element, a third switch element and a fourth switch element, which are respectively located at a front side, a rear side, a left side and a right side of said circuit board, wherein a first triggering part, a second triggering part, a third triggering part and a fourth triggering part are disposed on a bottom surface of said wheel swinging member at positions corresponding to said first switch element, said second switch element, said third switch element and said fourth switch element, respectively.