US 12,303,989 B2
Actuators for power tool safety systems
Stephen F. Gass, West Linn, OR (US)
Assigned to SawStop Holding LLC, Tualatin, OR (US)
Filed by SawStop Holding LLC, Tualatin, OR (US)
Filed on Jan. 4, 2024, as Appl. No. 18/404,142.
Application 18/404,142 is a continuation of application No. 17/228,008, filed on Apr. 12, 2021, granted, now 11,865,631.
Application 17/228,008 is a continuation of application No. 16/544,608, filed on Aug. 19, 2019, granted, now 10,981,238, issued on Apr. 20, 2021.
Application 16/544,608 is a continuation of application No. 13/393,919, filed on Mar. 2, 2012, granted, now 10,384,281, issued on Aug. 20, 2019.
Application 13/393,919 is a continuation of application No. PCT/US2010/002634, filed on Sep. 29, 2010.
Claims priority of provisional application 61/464,940, filed on Mar. 11, 2011.
Claims priority of provisional application 61/278,111, filed on Oct. 2, 2009.
Prior Publication US 2024/0139838 A1, May 2, 2024
Int. Cl. B23D 47/10 (2006.01); B23D 59/00 (2006.01); B27B 5/38 (2006.01); B27G 19/02 (2006.01); F15B 15/19 (2006.01)
CPC B23D 47/10 (2013.01) [B23D 59/001 (2013.01); B27G 19/02 (2013.01); F15B 15/19 (2013.01); B27B 5/38 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A power tool comprising:
a blade for cutting workpieces;
a motor configured to drive the blade;
a structure supporting the blade and configured to allow the blade to retract;
an electromagnet to trigger a retraction of the blade; and
a circuit to control the first electromagnet,
where the electromagnet has a first metal part, a second metal part, a gap between the first metal part and the second metal part, and a coil of wire around the first metal part and within the gap between the first metal part and the second metal part;
where the coil of wire is connected to the circuit;
where the first metal part has a first surface, and the second metal part has a second surface;
and further comprising a third metal part contacting at least one of the first surface and the second surface;
where the third metal part moves out of contact with at least one of the first surface and the second surface to retract the blade; and
where the electromagnet controls whether the third metal part moves out of contact with at least one of the first surface and the second surface.