FEATURES
Features
Aluminum Alloy Shell: Norton closer shells
are constructed of a special aluminum alloy, carefully selected to accommodate individual
closer characteristics and operating conditions.
Adjustable Spring Power: Clock-type coil
spring affords a wide range of closer power. Permits a fine adjustment of the closer to
the environment.
Rack & Pinion Operation: Provides a
smooth transmission of power for control of the door through its full opening and closing
cycle.
Adjustable Sweep/Latch Speed: A dual
purpose regulating valve, hex-key-operated, permits independent adjustment of both sweep
and latch speed.
Adjustable Backcheck Cushioning: An
independent regulating valve, hex-key-operated, provides an adjustable hydraulic cushion
to the door opening speed toward the end of the opening cycle. This feature is standard
with all but Delayed-Action closers. Backcheck is not available with Delayed-Action
closers.
Non-Hold-Open Arm: Standard closer will be
supplied with a Non-Hold-Open Arm. This arm is non-handed.
Adjusta-Power Shoe: Supplied as standard
for a 15% (± 7-1/2%) power adjustment by relocating the forearm at the shoe, for regular
arm non-hold-open closers, only.
Hold-Open Arm: Closer arm has adjustable
hold-open feature (90° to 180°). This arm is non-handed for regular arm application
only. It is handed for all parallel arm installations. Order by suffixing
"HA" to the Catalog Number.
Fusible-Link Hold-Open Arm: Adjustable
hold-open arm (90° to 180°) available for fire door application. The heat of a fire
causes the fusible link to melt, and releases the door from Hold-Open. Fusible link has a
melting point: 125°F (52°C). This arm is handed, specify hand of door on the order. Order
by suffixing "HFL" to the Catolog Number.
Field Reversible: Closer spring can be
field-reversed to accommodate the hand of the door. It is recommended that wherever
possible the closer be ordered handed. Parallel Hold-Open arms, all Fusible-link Hold-Open
arms and Delayed-Action closers are not reversible.
Parallel Rigid Arm: Norton Traditional
Surface Closers are available with a heavy-duty forearm for parallel arm applications
where heavy traffic and heavy use are anticipated. Order by suffixing
"PRA" to the Catalog Number for Non-Hold-Open arm (Non-handed), also
available in Hold-Open and Fusible-Link Hold-Open. Order by suffixing
"PRH" or "PRHFL" to the Catalog Number. Hold-Open and
Fusible-Link Hold-Open arms are handed.
Brackets/Accessories: A wide choice of
brackets and accessories permit installation in most door and frame configurations.
Special Feature Closers
Delayed-Action Closing: This feature slows
the speed of the door at the beginning of the door's closing cycle, to enable slow-moving
traffic such as hospital carts, persons confined to wheelchairs or other handicapped
individuals to pass through the opening before the closer begins its normal closing cycle.
Available for regular arm applications only. Order by suffixing "DA" to
the Catalog Number.
Unitrol® Door
Controls: The Traditional Surface Closer is the basic control component
for the Norton Series UNI-78-B/F Unitrol® Door Controls. For catalog
information on these specialized shock-absorbing controls, refer to Section Unitrol®. |
