Hello everyone. I am an engineering student and have a senior project where we have to invent something. My group and I have been designing a learning and safety system for a certain application. Without giving too much information since it is a potentially patent-able idea, I have a few questions. We are planning on using a ratchet and pawl mechanism that with each click of a tooth on the ratchet, an axle with rotate and raise a component. The component will begin at "level 0". The number of teeth on the ratchet will be the number of "levels" the component can be raised. As for the safety feature, when a variable is detected, the pawl will be released via a solenoid and the component mentioned will need to drop down to "level 0" and lock in. We are having a difficult time figuring out a mechanism which can, in one motion, release that "lock" at level 0 and proceed to raise the component, drop down and lock AND be repeated without any other steps. Does anyone have any ideas for us? Even something different than a ratchet and pawl mechanism? Thank you!