General Information Guide - ASSA ABLOY Door Security Solutions ...

Door Closer General Information
Surface mounted Door Closers/Concealed Door Closers
Norton ® closers can be surface-mounted or concealed in the frame. Each type has its advantages and disadvantages.
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CONTrOLS
Surface-mounted Closers
This type of door control is easiest to install, with four drilled and/or tapped holes for the body, and two, four or five holes for the arm
bracket. They require a minimum amount of preparation of the door and frame. The surface-mounted closer is also more accessible
to the occasional adjustment that may be necessary with changes in usage or environmental conditions. Although surface-mounted
closers, by definition, are never truly concealed, most Norton closers can be ordered with covers in a variety of painted or plated
finishes to soften the closer's effect on the building design.
Concealed Closers
On the occasions where the architect's design calls for a door closer that is not visually obvious, a concealed closer is recommended.
This installation requires considerably more door and frame preparation than a similar surface-mounted closer.
Overhead Concealed Closers
This type of door control is normally mortised into the transom of the frame above the door. A slide track is mortised into the
top rail of the door. All elements — closer, arm and slide track — are totally concealed when the door is closed. Norton overhead
concealed closers provide sweep and latch speed adjustments, backcheck cushioning and shock absorption. The Series 7900 closers
also provide a 50% power adjustment feature. They are available with or without the hold open feature.
regular Arm, Top Jamb and Parallel Arm
There are three basic methods of mounting surface door closers to the door and frame. The method the architect chooses is
influenced by some combination of these five factors:
• Closer position, relative to the locations of door, frame and hinges
• Space limitations on the top rail of the door
• Space limitations on the frame face above the door
• Appearance
• Accessibility of the closer arm (especially in schools)
The three basic mounting methods which follow are illustrated with a double lever arm.
regular Arm
The closer body is mounted on the top rail , hinge
side of the door. The forearm is mounted to the frame
face by means of a mounting shoe. The closer body
requires less space on the door's top rail than a parallel
arm installation. The arm projects from the door at
approximately a right angle. Finally, the geometry of the
assembly makes a regular arm closer somewhat more
power-efficient than a parallel arm closer.
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