Cantilever Slide Gates
Cantilever Slide Gate Theory
The term, cantilever slide gate, may refer to any number of
gates, from ornamental picket styles to functional chain link styles, from those that
require cantilever rollers to those requiring gate tracks and trolleys. All cantilever
slide gates will share certain characteristcs which differentiate themselves from other
types of slide gates. Cantilever slide gates are unique from other types of slide gates in
their construction, hardware choices, and design.
Cantilever slide gates are built larger than the gate
opening they are designed to close, often as much as 50% larger than their respective
openings. The idea here is to hang the gate on two or more mounting posts and have the
gate suspend off these mounting posts into the gate opening to close. In general, no part
of the gate comes in contact with the ground directly, or indirectly with any type of
wheel. Instead, these slide gates 'cantilever' to close the opening. Cantilever
construction allows for overhanging structures without external bracing. It is key that
cantilever gate frame be constructed properly to help withstand the forces of gravity and
wind. Intricate diagonal bracing and trusses are usually strategically welded in place to
help prevent gate sag.
Advantages to cantilever slide gates over other styles are
numerous. Since no part of the gate comes in contact directly or indirectly with the
ground, cantilever slide gates are easy to automate with gate operators.
Gates can often very easily be installed perfectly level. Proper design, fabrication, and
installation of a cantilever slide gate will reduce friction during operation and prolong
the life of a gate operator. Gate hardware systems from a quality fence supply source will
provide smooth operation and low maintenance. A cantilever slide gate features the ability
to slide along the fence line without requiring any lateral space as swing type gates
Other types of slide gate systems may have a leading edge
wheel installed on the latch side of the gate. These leading edge type wheels either roll
directly on the ground, or on a track installed across the driveway or gate opening. Care
must be taken to assure the gate opening or driveway is kept perfectly clear of debris or
wheels will meet obstructions. Gates which slide on a track imbedded on the ground are
often referred to as V-Track gates. Essentially a piece of inverted angle iron is bolted
down to concrete and a special v-groove
wheel rides it. Gates which have a rubber or pneumatic wheel to
roll over the ground are simply Rolling
Gates. V-Track gates are popular in southern regions where snow and ice are rare.
V-Track gates are often automated with gate operators. Rolling gates on the other hand are
popular in northern and southern regions. Both these styles can be appealing as they often
will not require a counterbalance which can be as large as 50% more than the gate opening.
Automating a slide gate requires the gate slide perfectly in both directions and be
installed level. Although this is often easiest to accomplish by installing a cantilever
gate, v-track gates and rolling gates can also carefully be automated. Again, automating a
slide gate requires the gate slide perfectly in both directions! Possible obstructions to
leading edge wheels such as snow, ice, and other debris will cause gate operator failure.
Gates which do not stay on their tracks can be extremely dangerous when opened and closed
manually, and especially with a gate opener.
Cantilever Slide Gate Practice
Typically two or more galvanized steel posts are set
to support the weight of the gate and serve as mounting posts. Gate posts may be round or
square. Gates may be built as much as 50% more than the gate opening size to provide a
counterbalance, or cantilever for the gate opening portion. Gate frames may be round or
square. Gates may be constructed of aluminum or steel - both are normally welded
construction. Professional gate construction is highly recommended as gate frames
themselves often serve as the track, providing a smooth even surface for gates to open and
Gates are often stretched with chain link across a portion,
or all of the frame. Gates which are automated should have mesh stretched across the
entire surface for safety reasons and to comply with ASTM and UL-325 standards.
Steel Cantilever Gates -
Steel Cantilever Gates
are typically constructed with galvanized round tubing. Top and bottom horizontals rails
are often 2-1/2" O.D. (2-3/8" actual) tubing in Sch40 or SS40 grades.
2" O.D. (1-7/8" actual) serve as vertical braces, and 1-5/8" O.D. diagonal
bracing is welded in place to help prevent gate sag. Domestically made steel or nylon cantilever gate rollers
are mounted to the mounting posts, normally two at top and two at bottom. Import cantilever rollers are
also plentiful in both steel and nylon and are generally less expensive. Be sure to use
cantilever gate roller covers on all rollers for safety and to protect pinch points. Gate is
'sandwiched' in-between the top and bottom rollers and slides to open and close.
Cantilever gate rollers typically all have a galvanized chassis to prevent rust. Rollers
themselves are available in galvanized steel or nylon. Both are quality rollers which can
provide years of uninterrupted service. An assortment of padlockable cantilever gate latches
are available. Some are designed specifically as automated slide gates latches.
Steel cantilever gates can be made to close gate openings 30' wide plus! 60' wide plus
openings can be closed using a double cantilever gate.
Aluminum Cantilever Gates - Internal
Track Aluminum Slide Gates are often made entirely of aluminum. A heavy duty aluminum gate track is welded
to, or is part of the gate frame itself. Hoover Fence offers aluminum slide gates built to
close 30' wide gate openings made with a single gate track. A 60' wide opening can be
closed using a double gate. We offer double track aluminum slide gates for gate openings
up to 40' wide, 80' wide doubles. Custom box frame gates are available for openings larger
than 40', but less than 60'. Although top track gates are more popular, bottom track and
bottom track gate components are also available. Gate track and gate frame slides to open
and close across two or more fixed gate trucks. Gate trolleys are secured to
galvanized steel mounting posts with galvanized steel truck hanger brackets.
||The Slide Gate Counter Balance should be approximately 1/2 the length of the gate opening.
Minimum counter balance should be 4' long. If an automatic operator is to be
installed, the counter balance may need to be longer so the operator can 'pull' the gate
shut by the rear of the counter balance. Always choose the operator and gate before
|Post sizes are important. Generally steel chain link cantilever slide gates require 3"
O.D. roller posts for widths up to 10' opening size. Use 4" O.D. posts up to 20' and
6-5/8" O.D. posts up to 32'. These specifications are for 6' high gates and shorter.
For taller gates increase post sizes at each step and use 8-5/8" O.D. posts for 32'
gates. We use mostly 4" OD steel posts for our aluminum slide gates.
need to be significant. 18" diameter x 42" deep is recommended for 3-4"
posts, 24" diameter x 42" for 6-5/8" O.D. posts and 30" diameter
x 48" for 8-5/8" O.D. posts. Increase bottom diameters 6"; creating a
bell-shaped hole. The up and down stress with these type gates will 'work' even the
largest posts out of the ground. Poor soil conditions, such as sand, will require larger
footers. Always consult local building codes or practices prior to beginning any
construction project. Call 811 prior
to excavating post hole footers.
Copyright 2010, All
Specifications & Information Subject to Change without Notice
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