US 12,263,568 B2
Head valve system for air spring power tool
Ramon Tam, Buffalo Grove, IL (US); Peter Wierzchon, Morton Grove, IL (US); and Chien-Kuo Po, Taichung (TW)
Assigned to Robert Bosch Power Tools GmbH, Leinfelden-Echterdingen (DE); and Basso Industry Corp., Taichung (TW)
Filed by Robert Bosch GmbH, Stuttgart (DE); and Basso Industry Corp., Taichung (TW)
Filed on Sep. 15, 2021, as Appl. No. 17/475,560.
Prior Publication US 2023/0081812 A1, Mar. 16, 2023
Int. Cl. B25C 1/04 (2006.01); B25C 5/13 (2006.01); B25D 9/24 (2006.01)
CPC B25C 1/042 (2013.01) [B25C 5/13 (2013.01); B25D 9/24 (2013.01); B25D 2209/002 (2013.01); B25D 2250/181 (2013.01); B25D 2250/375 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A power tool, comprising:
an air spring cylinder;
a piston located within the air spring cylinder;
an air accumulator; and
a head valve assembly including a flapper valve configured to seal the air spring cylinder from the air accumulator when the flapper valve is in a non-firing position.