An improved quick disengagement apparatus is provided for selectively altering the positioning of an axially translatable member between an axially biased first position and a second position in opposition to said axial bias, and for releasably locking said translatable member in at least said second...http://www.google.ca/patents/US4692049?utm_source=gb-gplus-sharePatent US4692049 - Quick disengagement apparatus for power wheel mechanisms
