US Patent 11628544 Hook spanner

A hook spanner has a spanner body having two opposite side surfaces, a handle segment, and a hooking segment formed on an end of the handle segment. The hooking segment has an abutting end surface located away from the handle segment and having an abutting end surface extending obliquely from one of the two opposite side surfaces of the spanner body to the other side surface. The hook spanner is adapted to turn a nut having multiple grooves arranged around the nut. Each groove has an inclined surface extending obliquely and inwardly from a peripheral surface of the nut. The abutting end surface is aligned with the inclined groove surface of one of the grooves of the nut to stably turn the nut.