An electric seat assist device having a seat pivotally secured to a base. One or more cam members extend in generally opposing relationship from the seat and base and are seated on one or more sets of rollers which are linearly adjusted to raise and lower the seat by a drive member which is pivotally...http://www.google.sh/patents/US6702383?utm_source=gb-gplus-sharePatent US6702383 - Electric lifting cushion
