Patent ID: 7445613

Claim:
A product delivery device with rapid piston rod resetting, said device comprising: a) a casing comprising a first casing portion for a reservoir which is filled with product and from which the product can be delivered by means of a piston; b) a piston rod which can be moved in an advancing direction in order to move the piston towards an outlet of the reservoir in order to deliver the product; c) a dosing and activating means which performs a dosing movement relative to the casing and, together with the piston rod performs a delivery movement in the advancing direction, relative to the casing; d) a dosing member coupled to the dosing and activating means such that it is slaved in the delivery movement and during dosing performs a dosing movement, and which is in engagement with the piston rod which permits the dosing movement of the dosing member relative to the piston rod, and which slaves the piston rod during the delivery movement; e) wherein the dosing member can be moved transversely with respect to the piston rod, in order to release the engagement with the piston rod for resetting the piston rod counter to the advancing direction; f) a resetting and activating element movably coupled to the casing in order to perform a disengaging movement and an engaging movement; g) and a cam gear which couples the resetting and activating element to the dosing member, such that the dosing member is moved out of engagement with the piston rod by the disengaging movement and into engagement with the piston rod by the engaging movement, the cam gear comprising a gear input member coupled to the resetting and activating element and a gear output member coupled to the dosing member, wherein the gear input member and the gear output member are in an engagement which converts a movement caused by the engaging movement and the disengaging movement of the resetting and activating element, which the gear input member performs relative to the gear output member, into a movement of the gear output member transversely with respect to the piston rod; h) wherein the cam gear forms a transverse guiding rail which points transversely with respect to the advancing direction and on which the dosing member is guided when moving into and out of engagement.