Hold-open device for door closers

A modular hold-open device configured for use with a door closer comprising a closer body and a pinion rotatably mounted to the closer body, the modular hold-open device comprising:

• a case configured for mounting to the closer body;
• a reduction gear set mounted in the case, the reduction gear set comprising an input gear operable to engage the pinion such that rotation of the pinion in a door closing direction causes a door closing rotation of the input gear;
• a ratchet mechanism movably mounted in the case and engaged with an output gear of the reduction gear set such that the door closing rotation of the input gear is correlated with movement of the ratchet mechanism in a first direction;
• a pawl mounted in the case for movement between a hold position and a release position;
• an electric driver mounted in the case and operable to move the pawl between the hold position and the release position;
• and
• an onboard power supply mounted in the case and operable to supply power to the electric driver;
• wherein the pawl in the hold position mechanically engages the ratchet mechanism and selectively prevents movement of the ratchet mechanism in the first direction, thereby inhibiting the door closing rotation of the input gear and the rotation of the pinion in the door closing direction;
• and
• wherein the pawl in the release position permits movement of the ratchet mechanism in the first direction, thereby permitting the door closing rotation of the input gear and the rotation of the pinion in the door closing direction.

A modular hold-open device configured for use with a door closer comprising a closer body and a pinion rotatably mounted to the closer body, the modular hold-open device comprising:

• a case configured for mounting to the closer body;
• a first component movably mounted in the case and operable to engage the pinion such that rotation of the pinion in a door-closing direction is correlated with movement of the first component in a first direction;
• a second component mounted in the case for movement between a hold position and a release position, wherein the second component in the hold position mechanically engages the first component and selectively prevents movement of the first component in the first direction to thereby inhibit rotation of the pinion in the door-closing direction, and wherein the second component in the release position permits movement of the first component in the first direction to thereby permit rotation of the pinion in the door-closing direction;
• an electric driver mounted in the case and operable to move the second component between the hold position and the release position;
• and
• an onboard power supply mounted in the case and operable to supply power to the electric driver.