| Norton® Door
Controls General Information
Non-Handed: Products are said to be
non-handed when they can be installed, without modification, on either a right hand or
left hand door.
Field Reversible: Handed products
are said to be field reversible when the arrangement of their component parts can be
changed to permit their operation on a door of the opposite hand. Often, the labor cost
necessary to reverse the hand of a closer makes it desirable to order a closer of the
correct hand.
Hold-Open: Any means which is
employed to maintain a door in an open position. Norton door controls employ four basic
types of hold-open: Friction, Mechanical, Hydraulic and Magnetic.
Friction Hold-Open: This type of
holdopen consists of two friction surfaces connected by a threaded stud. As the closer arm
rotates, the two friction surfaces bind against each other. The amount of friction can be
adjusted by means of a nut at the friction point.
Fusible-Link Friction Hold-Open: This
is a form of friction hold-open that employs a fusible-link and spring-loaded clamp
assembly at the hold-open friction joint. The heat from a fire will melt the fusiblelink,
which releases the spring-loaded clamp assembly, relieving pressure on the friction joint
and permitting the door closer to close the door.
Mechanical Hold-Open: Norton uses
two types of mechanical hold-open. One is a plunger type, whereby a spring-loaded plunger
assembly engages either a ball rivet or a detent in a mating part. The other is a
spring-loaded roller catch within a slide track.
Hydraulic Hold-Open: This is the
type of hold-open employed in Norton Electromechanical closer-holders. An
electrically-controlled plunger assembly seals a chamber within the door closer to permit
hydraulic fluid to flow in only one direction. Since the fluid is trapped in this chamber,
the closer spring is prevented from closing the door. When power to the unit is
interrupted, the plunger valve opens and releases the door from hold-open. The door can
also be released from hold-open by pushing the door toward the closed position with enough
force (approximately 15 to 20 lbs.) to overcome the holding force on the plunger valve.
Magnetic Hold-Open: This is the
type of hold-open employed in our Electromagnetic door holders. An electromagnet is
mounted on either the wall or floor adjacent to the door and an armature is fastened to
the door. Hold-open is achieved when the door is opened and the electro-magnet and
armature make contact. Interrupting power to the electro-magnet will release the door from
hold-open. The door can also be released from hold-open by pushing the door toward the
closed position with enough force (approximately 30 lbs.) to overcome the force of the
electro-magnet.
Telephone Booth Door Closer: This
Special-feature door control holds the door open approximately 5° when the booth is not
in use. When the booth is being used, the door can be closed by the user.
Coupon Booth Hold-Open: This
Special-feature door control will hold a door open at approximately 15°. When the door is
opened more than 80° the closer will then close and latch the door. This Special-feature
closer is generally used on safe deposit box inspection cubicles in banks.
Hospital Hold-Open: This
Special-feature door control can hold a door open at any one of three points:
approximately 15°, 45° and 90° or beyond. This Special-feature closer is generally used
where ventilation and privacy are required without having the door fully closed.
Individually Sized Closers: These
ctosers are sized 2, 3, 4, 5 or 6 with each size having a different spring assembly. Each
spring assembly provides a minimum closing force that determines its size.
Multi-Size Power Adjustment Closers: These
closers have a spring assembly that can be adjusted thru a wide power range. Closers with
this feature are not individually sized but can be adjusted thru a range of sizes to meet
the power needs of the door.
50% Power Adjustment: The closer
has an external adjustment that allows preloading of the spring. Depending on the needs of
the specific installation, closer power can be increased 50% over the minimum closing
force for any size closer.
Adjusta-Power Shoe: This standard
non-hold-open regular arm or top jamb shoe has three mounting holes. By relocating the
closer arm, the closer's power can - in effect - be adjusted 15% (7-1/2% increase or
decrease). It provides a simple method of adjusting closer power to meet the need of the
specific installation. See "How Closers are Sized" for more details.
Low Profile Arm: A term used to
describe an arm which has a minimum space requirement in the vertical distance between the
closer pinion and the arm bracket. It requires less mounting space than closers with
standard arms.
Non-Critical Valves: These are
control valves used to regulate the flow of fluid - in contrast to valves that are either
fully open or fully closed. All control valves have a point of critical position i.e. a
very small adjustment of the valve results in a significant change in fluid flow.
Norton Door Closer control valves have been designed to
avoid operation at this critical point.
Parallel Rigid Arm: This is a
heavy-duty, non-telescoping forearm used in conjunction with a heavy-duty soffit plate.
Reveal: The distance measured from
the surface of the frame face to the surface of the door.
Tri-Style Packaging: The closer is
packed with all necessary hardware for mounting in any of the three traditional mounting
styles: Regular Arm, Parallel Arm or Top Jamb. Non-Hold-Open closers have an Adjusta-Power
shoe for regular arm and top jamb mounting and a soffit plate for parallel arm mounting.
Hold-Open Closers have the Hold-Open arm for regular arm and top jamb mounting and a
soffit adapter plate for parallel arm mounting.
Unitrol Door Control: This is a
proprietary Norton combination of a door closer, door holder and shock absorbing door
stop.
CloserPlus: This is a combination
of a door closer with an arm having a built-in positive stop and a hold-open feature which
may be engaged or disengaged as necessary.
Electromechanical Closer-Holder: This
is a door closer equipped with an electromechanical device which permits the door to be
held-open. When the door is manually pushed toward "Closed", the holding
mechanism releases and the door closes normally. The holding mechanism can also be
released by means of fire/smoke detectors. Norton Closer-Holders are available with or
without a built-in/ integral fire/smoke detector.
Power Track Closer-Holders: This is
a slide track equipped with an electrically operated hold-open mechanism. When the door is
pushed toward "closed" the hold-open mechanism will disengage and allow the door
to close. The holding mechanism can be released by either a self-contained fire/smoke
detector or by any compatible remote fire/smoke detection system.
Executive™ Door Holder/Release: Garage
Door Operator radio frequency technology applied to the hold-open of executive office
doors. R.F. receiver with switch contacts in the hold-open circuit of either a Norton
Electromechanical or Power Track Closer-Holder. During normal office business the door is
held~pen. When the executive requires security or privacy he pushes the button on the
remote hand-held transmitter. The switch in the receiver operates and interrupts the
hold-open circuit. The door closes.
Positive Stop: A physical limit to
the opening of a door. It may be provided by means of floor or wall - mounted stops -
usually with resilient bumpers-or by means of a limit imposed by the arm of the door
closer. Norton's CloserPlus is an example of the latter. |
