US 12,071,806 B2
Modular hold-open device for door closers
Yong K. Lacy, Carmel, IN (US); Akhil Ramesh Hamsagar, Bangalore (IN); Adithya Gangadhar Shetty, Bangalore (IN); Vijayakumar Mani, Bangalore (IN); Sundar Raj Dore Vasudevan, Bangalore (IN); David V. Toloday, Martinsville, IN (US); and Kanagaraj Shanmugam, Tamilnadu (IN)
Assigned to Schlage Lock Company LLC, Carmel, IN (US)
Filed by Schlage Lock Company LLC, Carmel, IN (US)
Filed on Dec. 6, 2022, as Appl. No. 18/075,966.
Application 18/075,966 is a continuation of application No. 17/184,040, filed on Feb. 24, 2021, granted, now 11,519,212.
Prior Publication US 2023/0313585 A1, Oct. 5, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. E05F 3/00 (2006.01); E05F 1/10 (2006.01); E05F 3/22 (2006.01)
CPC E05F 3/221 (2013.01) [E05F 1/10 (2013.01); E05Y 2201/41 (2013.01); E05Y 2201/418 (2013.01); E05Y 2201/716 (2013.01); E05Y 2201/722 (2013.01); E05Y 2900/132 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A hold-open device configured for use with a door closer comprising a pinion operable to rotate each of a door-closing direction and a door-opening direction opposite the door-closing direction, the hold-open device comprising:
a shaft configured for rotational coupling with the pinion;
a ratchet wheel engaged with the shaft such that rotation of the shaft in the door-closing direction causes rotation of the ratchet wheel in a first rotational direction; and
a pawl operable to engage the ratchet wheel, the pawl having a holding position in which the pawl prevents rotation of the ratchet wheel in the first rotational direction to thereby prevent rotation of the shaft in the door-closing direction, the pawl having a release position in which the pawl permits movement of the ratchet wheel in the first rotational direction to thereby permit rotation of the shaft in the door-closing direction; and
wherein the ratchet wheel is configured to drive the pawl from the holding position which prevents rotation of the shaft in the door-closing direction to the release position in response to application of a threshold torque to the shaft to thereby permit rotation of the shaft in the door-closing direction.