Drive shaft coupling

A selectively engaging coupling, comprising:

• a drive gear having a drive gear body defining a first central axis, the drive gear having a drive tooth;
• a driven gear having a driven gear body defining a second central axis and having a driven tooth, the drive tooth configured to selectively engage the driven tooth upon substantial alignment of the first and second central axes such that the driven gear is rotated upon rotation of the drive gear;
• and
• a biasing member configured to allow one of the drive gear and the driven gear to move at least axially away from the other of the drive gear and the driven gear upon radially sliding of the drive gear relative to the driven gear between a non-engagement position, wherein the first and second central axes are out of alignment, to an engagement position, wherein the first and second central axes are substantially aligned.

A method, comprising:

• sliding one of a drive gear and a driven gear into substantial axial alignment with the other of the drive gear and the driven gear while moving at least one of the drive gear and the driven gear axially away from the other of the drive gear and the driven gear;
• urging the at least one of the drive gear and the driven gear axially toward the other of the drive gear and the driven gear when the drive gear is in substantial axial alignment with the driven gear;
• and
• engaging a drive tooth of the drive gear with a driven tooth of the driven gear.