A rack and pinion pull-up latch comprises a housing containing a reciprocating push-button which alternates between two positions. Means are provided to secure the push-button in these two positions. Supported by the push-button is a stepped pinion which engages two stationary racks within the housing...http://www.google.co.uk/patents/US5346266?utm_source=gb-gplus-sharePatent US5346266 - Rack and pinion pull-up latch
