US Patent 10046450 Mode change knob assembly

A knob assembly for a power tool comprising: a knob having a slot and knob recess, the slot and knob recess intersecting each other at an intersection within the knob; a latch slideably mounted within the slot; a peg located within the knob recess; wherein the peg and latch engage with each other via the intersection in order for the peg to retain the latch within the slot and for the latch to retain peg within the knob recess.