June 1, 2021
by Betty Chen, CSI, and Michael Chusid, RA, FCSI
A closer hinge, an advanced type of spring hinge, incorporates the door control mechanisms into the barrel of a hinge. Innovative engineering has made closer hinges more compact and functional; the new generation of products provides unique combinations of features and benefits to address door closing challenges that are not satisfactorily met by overhead surface-mounted door closers. In addition to being used on doors with special needs, closer hinges are increasingly being employed on many types of ordinary doors due to economic, aesthetic, practical, and other reasons.
The high performance of contemporary closers can be appreciated by considering the limitations of primitive types incorporating a cord running from a door via a pulley to a counterweight mounted adjacent to the door frame. While this contraption is as dependable as gravity, its closing speed varies as the falling counterweight gains momentum. If, however, the door is released in a partially open position, the closing speed generated by the counterweight may be insufficient to cause the door to fully close. If the door is released while fully open, acceleration can cause the door to slam shut, producing objectionable noise and the potential for injury. It can be difficult to balance the force required to open the door with the force needed to close the door. Simple springs can also be used to close doors, yet have similar drawbacks, as can be attested by anyone who has heard a spring-loaded screen door slam shut.
To overcome these limitations, the springs in high-performance closer hinges are adjustable and regulated by various types of mechanical and hydraulic devices. As a result, some manufacturers of closer hinges exceed the Builders Hardware Manufacturers Association (BHMA) A156.17, Self-closing Hinges & Pivots, and are able to meet some or all of the following characteristics.
This is the de-facto criteria for accessible doors as stipulated in the Americans with Disabilities Act (ADA)(See, also, similar requirements in the Architectural Barriers Act (ABA), Uniform Federal Accessibility Standards (UFAS), and ICC A117.1, Accessible and Usable Buildings and Facilities):
307.2 Protrusion Limits. Objects with leading edges more than 27 inches (685 mm) and not more than 80 inches (2030 mm) above the finish floor or ground shall protrude 4 inches (100 mm) maximum horizontally into the circulation path (One of the authors of this paper is approximately 1956 mm (6 ft 5 in.) tall and can attest to hazard of overhead closers protruding into doorways).
404.2.8.1 Door Closers and Gate Closers. Door closers and gate closers shall be adjusted so that from an open position of 90 degrees, the time required to move the door to a position of 12 degrees from the latch is 5 seconds minimum.
404.2.8.2 Spring Hinges. Door and gate spring hinges shall be adjusted so that from the open position of 70 degrees, the door or gate shall move to the closed position in 1.5 seconds minimum.
In addition to accessibility, limits on closing speed are a safety issue that can reduce door-related injuries.
404.2.9 Door and Gate Opening Force. Fire doors shall have a minimum opening force allowable by the appropriate administrative authority. The force for pushing or pulling open a door or gate other than fire doors shall be as follows: 1. Interior hinged doors and gates: 5 pounds (22.2 N) maximum.
While opening force for exterior doors is not specified in ADA, project specifications should require the minimum force practical.
Listed for fire-rated construction
To be used in an opening in a fire-resistance-rated wall or partition, closer hinges should be labeled by a recognized product certification service for use with fire-resistant doors. Up to three-hour ratings are available. Steel or stainless steel products are typically used for listed hardware.
Durability and strength
According to BHMA A156.17, Grade 1 closer hinges must pass rigorous testing for one million cycles of opening and closing on a door of a specified size and weight. They must also survive a static load test to ensure spring hinges have adequate strength to withstand anticipated loads.
Conditions of use
Closer hinges should be selected with regard for manufacturer’s recommendations for maximum operating range (degree of opening) and ambient temperature. Closer hinges that install like full mortise butt hinges are less exposed to vandalism and abuse than surface-mounted types. Some products have built in hold-open capability and door stops, eliminating the cost and clutter of using separate hardware devices.
In other cases, a swing clear type of hinge, also known as an offset door hinge, can maximize the effective width of a door opening by swinging the door out of the path of travel and is useful for wheelchair-accessible doorways. Closer hinges are also convenient in pairs of communicating doors where space between the two doors is inadequate for surface-mounted closers. Weather-resistant products should be used in wet areas.
Closer hinges conforming to BHMA A156.7, Template Hinge Dimensions, can be used interchangeably with ordinary door hinges. Using a familiar template simplifies door and frame preparation and allows closer hinges to be retrofit to existing doors.
Finishes and corrosion resistance
BHMA A156.18, Materials and Finishes, spells out tests for corrosion resistance and other factors affecting door finishes. It also has nomenclature for finishes and substrates. Stainless steel is recommended for exterior and harsh environments and heavy-duty doors; aluminum is also available for non-fire-rated and interior doors.
Closer hinges control closing speed to prevent the loud and startling noise of slamming doors. Noise control contributes to the comfort and well-being of building occupants.
For many architectural doors, “form is the function,” and hardware must enhance (or at least not detract from) the appearance of the doorway. Barrels of some closer hinges are only modestly larger than those of standard types and are so discrete they should be considered concealed closers.
Comparing closer types
With many reasons to use a door closer (see “Why Use Closers,” page 14) and an endless variety of building conditions, determining whether to use closer hinges or overhead closers requires professional judgment.
It is difficult to install an overhead closer if the top of a door is arched or constrained by a low ceiling or narrow door frame. Similar problems occur with gates and partial height doors where there is no place to anchor an overhead closer. If a doorway is in a corner, an adjacent wall, cabinets, or other surfaces abutting it may interfere with the arms of an overhead door.
As a general rule, the more parts to be installed, the greater the construction cost. One popular overhead door model requires the installer to handle 47 separate components—many of which are small fasteners—that can be difficult to track in dimly lit construction sites. In comparison, installing closer hinges require no more parts than the ordinary butt hinges used with overhead closers. The number of installation steps goes up when one considers time for drilling holes to install overhead closers and the addition of separate hold-open and door stop devices.
Steel doors and frames require reinforcing to provide secure attachment of overhead closers. Reinforcing installed in the field further increases the number of parts to be handled and complicates inspection of work that will be concealed after installation. Reinforcement installed in the fabricator’s shop requires coordination of shop drawings (Consult section 5.2 of Steel Door Institute (SDI) A250.6, Hardware Reinforcing on Standard Steel Doors and Frames. It says, “Doors and frames shall be prepared by the installer in the field for surface applied hardware such as surface closers…”).
Adding overhead closers to doorways where they were not originally specified may require modifications to existing doors and frames. Closer hinges, on the other hand, can be installed by replacing the original hinges, one at a time, without having to do remedial work to existing doors and frames.
While overhead closers can be dressed up with handsome covers, they are still a visual intrusion. This may of special concern with dramatic entrances, wood doors with matched veneers, the minimalist lines of glass doors, custom-designed doors, and when trying to preserve the appearance of doors with historic or period detailing.
The oil used in hydraulic closers can leak, staining clothing of people using the doorway and making floors extremely slick and dangerous. “More importantly,” writes Matthew T. Orcutt, an authority on overhead closers, “when the oil drains from the [overhead door closer] cylinder, the closer’s ability to control the door is lost. If total leakage were to occur, the door swings freely and could lead to injuries as well as costly damage to the door and frame.”
While the oil can also leak from a closer hinge that has hybrid mechanical and hydraulic action, the result should not be devastating. There is significantly less oil to leak and the spring in the door continues to provide basic door closing functions.
Another maintenance issue originates from the protruding arms of overhead closers, which can be damaged by heavy use, abuse, or vandalism.
Simply put, overhead closers offer many more options and a wider range of performance than is available from closer hinges. For example, some overhead closers can be adjusted to control back check, slowing the door before it opens fully. Others have a reservoir of force to boost latching speed to power through the final few degrees of closing a door. Others can be opened a full 180 degrees, an opening that may accelerate wear on some closer hinges.
BHMA points out door testing typically takes place under laboratory conditions. In actual use, results vary because of installation, maintenance, and environmental conditions. Actual closer performance is affected by fluctuating ambient conditions such as wind and pressure differentials (Consult the Builders Hardware Manufacturers Association (BHMA) A156.4, Door Controls – Closers).
Closer hinges are frequently specified as a set where each of the closer hinges may have different attributes. It is best to consult with the closer hinge manufacturer or a hardware consultant familiar with the proposed product.
It would be a mistake to assume closer hinges will replace overhead closers in all locations. However, closer hinges have proven their utility for many entrance conditions, and may even prove to be the preferred solution for many ordinary doorways.
Betty Chen, CSI, is senior marketing manager for Waterson Group with responsibility for in the United States and internationally. She can be reached via www.watersonusa.com.
Michael Chusid, RA FCSI, is an authority on building products and a frequent contributor to this magazine. He can be reached at www.chusid.com.
Source URL: https://www.constructionspecifier.com/door-closer-hinges-a-new-approach/
Copyright ©2022 Construction Specifier unless otherwise noted.