Patent ID: 7810660

Claim:
A model railroad coupler for use between two units of model railroad rolling stock, each unit of rolling stock having a rolling stock longitudinal axis, and a coupler box for receiving a coupler therein, the coupler box being located about the rolling stock longitudinal axis and further having a coupler pivot pin therein, each coupler comprising: (1) a coupler head and a coupler knuckle carried pivotally on said coupler head; (2) an elongate coupler shank having one end thereof fixed to said coupler head; (3) a coupler mounting structure carried at the other end of said coupler shank, said shank having a shank longitudinal axis; wherein said coupler head includes a coupler head side flange, having a flat, inner-facing surface which is parallel to said shank axis, thereon for preventing over rotation of said coupler knuckle and resultant entrapment of a knuckle on a connected unit of rolling stock.