Norton 8501 Series
Multi-Size Door Closers
- Multi-size power - the closer spring assembly can be adjusted through a wide power range
- Two power ranges - adjusted through a range of sizes, 2 through 6
- Non-handed
- Aluminum alloy shell - closer bodies are constructed of a special aluminum alloy
- Adjustable back check cushioning
- Adjustable delayed action closing
- Non-critical valves
- Molded full cover
Adjustable sweep speed - an independent regulating valve, hex-keyed-operated, permits adjustment of the general closing speed
Latch speed - an independent regualting valve, hex-key-operated, permits adjustment of the door's speed for approximately the last 5 degrees of the closing cycle
Regular Arm
This is the only pull-side application where a double lever arm is used. It is the most power-efficient application for a door closer. Sufficient frame, door and/or ceiling clearance must be considered.
Top Jamb
For efficiency reasons this application provides the best alternative to the regular arm application. There must be sufficient frame face and/or ceiling clearance for this application. It requires a top rail on the door of just 2-1/4" (57mm). This application provides the best door control
for doors in exterior walls that swing out of a building.
Parallel Arm
This application provides the most appealing design appearance for a surface-mounted door closer having a double lever arm. This also makes it beneficial in vandalism-prone areas. It is on the push side of the door and the arm assembly extends almost parallel to the door. In the closed position, there is very little or no hardware projecting beyond the frame face in most situations.
Hold Open
Achieved by means of friction or ball and detent/ roller. Friction hold open has a range of 90° to 180° using template location and mechanical adjustment. Ball and detent or roller hold open is effective in a range of 85° to 110°. Hold open arm door closers are not permitted to be used on fire door assemblies.
CloserPlus® Arm
This arm incorporates a stop at the arm’s soffit plate to dead stop the door at a predetermined degree of door swing between 85° and 110°, in 5° increments. Prior to dead stop the door closer’s backcheck feature slows the door speed to reduce the impact of the stop action.
Parallel Rigid Arm
An enhanced variation of the standard parallel arm assembly that is intended for use in heavy traffic areas where auxiliary door stops are installed.
