US Patent 10239342 Application pen

The invention relates to an application pen for dispensing a liquid onto a surface, such as for applying a protection layer onto adhesion surfaces of a vehicle; for example, for improving adhesion in the case of adhesive applications, the application pen including a hollow body and an ampoule which is received in the hollow body, including a circumferential face, for receiving the liquid, wherein the ampoule can be broken for discharging the liquid, wherein a breaking device with an axially movable portion is provided and is realized in such a manner that a movement of the movable portion in the axial direction results in the breaking of the ampoule.