The present invention relates to a metered, mechanically propelled, liquid dispenser. It has a main body cylinder having liquid and liquid advancing mechanism for advancing the liquid into a metered dosage dispensing chamber. There is a cocking mechanism which includes a lock pin, a stressed slot and...http://www.google.fr/patents/US6413246?utm_source=gb-gplus-shareBrevet US6413246 - Metered, mechanically propelled, liquid dispenser
