US 12,071,789 B2
Universal dogging and electronic latch retraction
Victor Bogdanov, Manchester, CT (US); Liza Alcala Escobar, Avon, CT (US); and Darren C. Eller, Madison, CT (US)
Assigned to Sargent Manufacturing Company, New Haven, CT (US)
Filed by Sargent Manufacturing Company, New Haven, CT (US)
Filed on Sep. 29, 2021, as Appl. No. 17/488,782.
Application 17/488,782 is a continuation of application No. 17/422,963, previously published as PCT/US2020/015339, filed on Jan. 28, 2020.
Claims priority of provisional application 62/797,712, filed on Jan. 28, 2019.
Prior Publication US 2022/0018162 A1, Jan. 20, 2022
Int. Cl. E05B 65/10 (2006.01)
CPC E05B 65/1093 (2013.01) [E05B 65/1053 (2013.01); E05B 65/1073 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An electronic latch retraction device for an exit device, the exit device including a push bar configured to move between an extended position and a retracted position, the electronic latch retraction device comprising:
an electromechanical actuator;
a force input portion configured to receive force from the electromechanical actuator;
a force output portion configured to transmit the force received by the force input portion to the push bar to move the push bar to the retracted position, wherein the force transmitted to the push bar to the move the push bar to the retracted position is between 1.2 and 2 times greater than the force received by the force input portion; and
a cam wheel coupling the force input portion to the force output portion, wherein the cam wheel is coupled to the force input portion with a first pin, wherein the cam wheel is configured to rotate about an axis of a second pin between a first rotational position and a second rotational position in response to movement of the force input portion, wherein the cam wheel is coupled to the force output portion with a third pin configured to move along a slot of the cam wheel, and wherein the force output portion is configured to rotate and move in a linear direction as the cam wheel is rotated.