Patent ID: 8091903

Claim:
A retractable wheel assembly for coupling to a mounting on an object, the retractable wheel assembly being moveable between one or more extended position(s) and a retracted position, wherein in the extended position(s) the retractable wheel assembly is configured to expose a wheel and to stow said wheel in the retracted position, the retractable wheel assembly comprising: a first wheel strut rotatably coupled to a first mounting at or proximate a first end of the first wheel strut, a first link arm handle rotatably coupled at or proximate a second end of the first wheel strut, and a first over-centre locking arm rotatably coupled at or proximate a first end of the first over-centre locking arm to the first link arm handle and rotatably coupled to a second mounting at or proximate a second end of the first over-centre locking arm, wherein the retractable wheel assembly is configured to rotatably couple to the wheel at or proximate the coupling between the first wheel strut and the first link arm handle, wherein the retractable wheel assembly is configured such that the first over-centre locking arm must move in both first and second directions about the second mounting as the assembly is moved from any one of the said one or more extended position(s) to the retracted position or from the retracted position to any one of the said one or more extended position(s), wherein the first and second directions are substantially opposing.