US 11,679,479 B2
Abnormal torque protection mechanism 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 GmbH, Stuttgart (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. 17/475,511.
Prior Publication US 2023/0088831 A1, Mar. 23, 2023
Int. Cl. B25C 1/04 (2006.01); B25C 1/06 (2006.01)
CPC B25C 1/047 (2013.01) [B25C 1/06 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A power tool, comprising:
an air spring cylinder;
a piston movably positioned within the air spring cylinder;
a driver blade fixedly attached to the piston;
a rack fixedly attached to the piston;
a lifter gear including a lifter gear wheel portion, and a plurality of teeth extending radially from the lifter gear wheel portion and configured to engage the rack;
a motor including a motor output;
a hub including a first end operably connected to the motor output and a second end including a hub wheel portion;
a first receptacle in one of the lifter gear and the hub;
a first bearing element extending from the other of the lifter gear and the hub and into the first receptacle; and
a first elastomeric damper positioned within the first receptacle between the first bearing element and a bearing element defined portion of the first receptacle.