Abstract: A medicament delivery device is provided that has a body, a medicament container provided with a medicament delivery member arranged in the body, and a drive unit having a plunger rod and a drive spring. The drive unit is operatively connected to the medicament container. An activator is operatively connected to the drive unit. A safety mechanism is operatively connected to the plunger rod. In an initial state of the device, the plunger rod is held with the drive spring in a tensioned state and a safety mechanism is in contact with, and prevents release of, the plunger rod. When the device is pressed against an injection site, the activator acts on the safety mechanism for moving the safety mechanism out of contact with the plunger rod. The activator releases the plunger rod, causing the plunger rod to act on the medicament container for delivery of medicament.

Abstract: In a dose setting mode of a dose delivery device, a dose selector is rotated to turn a nut, which thereby moves backward along a thread of a piston rod through a first axial distance. A gearing mechanism transmits the axial movement of the nut to a connector that moves backward, without rotation, through a second axial distance. In a dose delivery mode of the device, the dose selector is pushed forward and drives the connector to move forward through the second axial distance. The gearing mechanism transmits the axial movement of the connector to the nut, which pushes the piston rod forward, without rotation, through the first axial distance. The gearing mechanism includes a first gear that rotates without axial movement relative to the housing, and a second gear that rotates without axial movement relative to the nut.