Universal dogging and electronic latch retraction

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 first linkage coupled to the electromechanical actuator, wherein the first linkage is configured to move in a linear direction between a first linear position and a second linear position;
• a cam wheel coupled to the first linkage, wherein the cam wheel is configured to rotate between a first rotational position and a second rotational position when the first linkage moves between the first position and the second linear position;
• and
• a second linkage coupled to the cam wheel and configured to be coupled to a lever of the exit device, wherein the second linkage is configured to actuate the lever when the cam wheel rotates from the first rotational position to the second rotational position.

An exit device comprising:

• a push bar including a lever, wherein the lever is configured to move the push bar between an extended position and a retracted position;
• a latch retraction device comprising:
• a first actuator,
• a first linkage coupled to the first actuator, wherein the first linkage is configured to move in a linear direction between a first linear position and a second linear position,
• a cam wheel coupled to the first linkage, wherein the cam wheel is configured to rotate between a first rotational position and a second rotational position when the first linkage moves between the first position and the second linear position, and
• a second linkage coupled to the cam wheel and configured to be coupled to the lever, wherein the second linkage is configured to actuate the lever when the cam wheel rotates from the first rotational position to the second rotational position;
• and
• a dogging mechanism comprising:
• a blocking element configured to move between a first blocking position and a second unblocking position, wherein the blocking element is configured to block motion of the push bar from the retracted position toward the extended position when the blocking element is in the second position, and wherein the blocking element is configured to allow motion of the push bar from the retracted position toward the extended position,
• a ratchet and pawl configured to prevent movement of the blocking element towards the second unblocking position, wherein the ratchet includes a plurality of locking regions, and a second actuator configured to move the blocking element from the first blocking position and the second unblocking position.