A few weeks ago someone asked me this question and I answered him directly rather than posting about it on the blog, but then yesterday I saw someone arrive at the site searching for the very same information. So, in case you too have been wondering what “CUSH” means in relation to door hardware, here you go…
CUSH is short for Cush-N-Stop, and it’s used in conjunction with LCN closers. You may also see it abbreviated as “CNS.” Other closer manufacturers offer the same feature but use different terminology to describe it. A CUSH arm has a door stop built into it, so when the arm reaches a certain point in the opening cycle of the door, the arm hits the stop on the shoe and stops the door.
There are several variations…the application-specific 4111-CUSH has the stop cast into the shoe. The universal 4041-CUSH has a stop that attaches in one of two positions on the shoe so it can be used for either hand. The Spring-CUSH or S-CUSH feature has a spring-loaded stop, to cushion the stop-effect. CUSH arms are also available with the hold-open feature, which would incorporate a t-handle to engage/disengage the hold-open.
With LCN products, the built-in stop is available for parallel-arm mounted closers only, because of the physics of the arm movement. It’s very handy for doors where a wall- or floor-stop can’t be used, but in abusive situations I recommend using a closer with a separate overhead stop. There are special templates available to help coordinate the installation of both products on the same real estate.
Here are some arm diagrams to help illustrate the various types: