US Patent 7281738 Interchangeable handle assembly for lock

An interchangeable handle assembly includes a spindle, a coupling member removably coupled to the spindle, and a handle. Two grooves are defined in an outer circumferential face of the spindle. The coupling member includes two arms and an intermediate section between the arms. The arms are engaged in the grooves of the spindle. Each arm includes a coupling section on a distal end thereof. The handle includes a shank having a hole for removably coupling with the spindle. A circumferential wall delimiting the hole of the shank includes two coupling sections for respectively coupling with the coupling sections of the coupling member when the handle is coupled with the coupling member.