F41B 11/681 - Definition 
Definition statement
This subclass covers:
Arrangements for compressing the air in the air storage chamber (pressure accumulation tank), i.e. hand-pumps or electrically powered pumps integrated into the gun or permanently attached thereto for compressing atmospheric air into the pressure accumulation tank.
Hand pump 
Electrically driven pump 
Informative references
Attention is drawn to the following places, which may be of interest for search:
Electronic or electric systems, e.g. electric drive motor aspects | F41B 11/71 |
Arrangements for putting the spring under tension, in airguns with a spring loaded compressor piston | F41B 11/646 |