Commercial door closers and hardware
I recently had the pleasure of trying to adjust a commercial door closer, and I had a flood of memories come back of all the Rixson hardware I used to maintain at Nordstrom. It doesn’t seem like much, but door closers can be somewhat complicated. To get started, there are basically three components to the action of a commercial door.
1. back ckeck. this is what provides force against you when you try to open a door, basically if there was no back check, you could just as easily break a door opening it, as you could slamming it shut.
2. Sweep. This refers to the speed with which the door actually closes when you let go of the door. The sweep needs to be controlled, so that the door doesn’t slam shut.
3. Latch refers to how the door actually closes. If a door is working properly, you can actually observe the door close slowly, and then at the last minute the sweep control will let go to let the door accelerate slightly just enough to let the locking mechanism catch.
I remember spending hours trying to adjust glass doors so that they have the same backcheck, the same sweep, and the same catch speed, and how seasonal changes would wreak havoc on the hydraulics, and cause the doors to open and close at different rates.
Because doors have a tendency to be easily forgotten, I suggest that you include in your regular PM program, a provision to check your doors. things that you want to include may be;
1 Open door to check proper back check, and that door does not swing fully open freely
2. allow door to close, verify that door closes gently
3. observe latch speed to ensure that door and latch mechanism are working properly
4. check closer for visible signs of wear or hydraulic fluid
Every door closer is different, but they all have a way to adjust each element of the function of the door, and you can usually find set screws in the closer for changing these settings.For more information about adjusting and installing door closer hardware, consult your manufacturer, or check out http://hubpages.com/hub/Door-Closer-Adjustment for a pretty good overview of how they work