Most of the stuff I design is specialized and is not really something that warrants being patented.
A few of the contraptions I have designed at work.
Evaporater coil manipulator
Multi sized filter assembly cell
Scented bead bottle assembly machine
This business used to be fun, now it is too cut-throat and companies demand more whiz bang stuff but want it in shorter time frames and for less money. Every machine is a "new" invention but we typically only might have 6-12 weeks to take it from a concept to a turnkey system with a performance guarantee.