Central locking mechanism for web disk wheels

Claim 1

In a central locking assembly for web disk wheels of the type wherein the wheel has a central guide bushing with a central bore for receiving a wheel carrier pin, means internally of said bore for radially centering the wheel with respect to the carrier pin, and a nut threadably engageable on said carrier pin and captively retained by a radially inwardly extending flange of said guide bushing, the improvement comprising: said nut being provided with a radial centering and bracing shoulder that is engageable with a corresponding annular zone on one side of said radially extending flange, a guide collar on said nut extending into said guide bushing and being provided with a funnel-like radially flaring section that is engageable with an opposite side of said radially extending flange, said guide collar having a length extending into said guide bushing corresponding to an axial displacement path of said nut with respect to said wheel carrier pin during threaded engagement, said flaring section reaching said opposite side of said annular flange when said nut is at a position corresponding to a disengagement end of said threaded engagement axial displacement path, and wherein said funnel-like section has a free rim of an outer diameter which corresponds approximately to an inner diameter of said guide bushing so as to provide a relatively large supporting base always approximately axially aligning and guiding said nut relative to the wheel.