US 12,462,990 B2
Safety switch for a battery pack powered trowel
Brennen M. Gleason, Milwaukee, WI (US); Caleb R. Hendryx, Waukesha, WI (US); Michael C. Reed, Milwaukee, WI (US); and Julio C. Armendariz, Durango (MX)
Assigned to Milwaukee Electric Tool Corporation, Brookfield, WI (US)
Filed by Milwaukee Electric Tool Corporation, Brookfield, WI (US)
Filed on Oct. 9, 2023, as Appl. No. 18/482,988.
Claims priority of provisional application 63/480,120, filed on Jan. 17, 2023.
Claims priority of provisional application 63/414,671, filed on Oct. 10, 2022.
Prior Publication US 2024/0120158 A1, Apr. 11, 2024
Int. Cl. H01H 9/06 (2006.01); E04F 21/24 (2006.01); H01H 21/10 (2006.01); H01M 50/247 (2021.01); H02K 11/33 (2016.01)
CPC H01H 9/06 (2013.01) [E04F 21/248 (2013.01); H01H 21/10 (2013.01); H01M 50/247 (2021.01); H02K 11/33 (2016.01); H01H 2009/065 (2013.01); H01H 2009/068 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A power trowel comprising:
a handle including a speed control input;
a housing;
a shaft connecting the handle and the housing;
a safety mechanism located on the shaft, the safety mechanism including a safety lever configured to move in response to an uncontrolled condition of the power trowel;
a blade assembly positioned below the housing;
a motor located within the housing and coupled to the blade assembly;
a controller connected to the motor and the safety mechanism, the controller configured to:
drive, in response to actuation of the speed control input, the motor,
detect a movement of the safety lever from a first position to a second position, and
perform, in response to the movement of the safety lever to the second position, a safety operation.