NORTON Door Closers - 7500 Series
Door Closers
- Non-handed
- Rack-and-pinion design
- Cast aluminum body
- 2⅛" projection
- 1½" diameter piston
- ⅝" diameter pinion journals
- Standard, separate and independent, latch, sweep and backcheck intensity valves
- Backcheck positioning valve
- Molded plastic cover
- All standard arm applications allow doors to swing 180 degrees, conditions permitting
- Sex nuts included
Closer bodies
are constructed of a special aluminum alloy, carefully selected to
accommodate interactive steel components and operating conditions.
Rack & pinion operation provides a smooth constant control of the
door through its full opening and closing cycle. 180° door swing can be
achieved when door, frame, hardware and arm function do not interfere.
Adjustable Delayed Action Closing (Optional)
An optional hydraulic feature, available in lieu of backcheck, adds a
third speed range to the closing cycle. This feature becomes effective
when the door is opened and released at any point beyond 70°. The
amount of time delay depends upon the combination of the angle of door
release and valve adjustment. The valve can be adjusted with a 1/8"
(3mm) hex key from no delay time up to maximum delay times of:
Door Opened
and Released at
|
Approximate Time
of Delay Cycle
|
180°
|
4-5 minutes
|
120°
|
2-3 minutes
|
90°
|
25-30 seconds
|
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.
