Nut with key for attachment to wheel axle or saddle pillar

摘要

Wheel axle and/or saddle pillar is retained on a bicycle and/or a saddle is held on a saddle pillar by a nut (1) with holes (5) in which the pins (6) of a key (2) engage to screw the nut onto a thread (4) or to unscrew it. A cap (3) is provided between the nut and the bicycle frame, surrounding the nut when it is tightened and leaving only the end face exposed. The cap fits loosely on the thread and has a lug (7) which limits its movement. Pref. there is a teflon sheet or cap between the cap and the nut. The surface is coated with teflon.