Patent ID: 7842016

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 moving a piston and a second casing portion movably connected to the first casing portion; b) a piston rod which can be moved in an advancing direction to move the piston towards an outlet of the reservoir 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; d) a dosing member connected to the dosing and activating means such that it is slaved in the delivery movement and, during the dosing movement of the dosing and activating means, the dosing member also performs a dosing movement, said dosing member in an 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, wherein the dosing member can be moved transversely with respect to the piston rod to release the engagement with the piston rod for resetting the piston rod counter to the advancing direction; e) a resetting and activating element movably connected to the first casing portion for performing a disengaging movement and an engaging movement, wherein the resetting and activating element is formed by the second casing portion; and f) a cam gear operably coupling 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, wherein the cam gear forms a guiding rail which extends transversely with respect to the advancing direction and by which the dosing member is guided when moving into and out of engagement.