Construction Dictionary Section 10 Specialties Terms

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SECTION 10600

ACCORDIAN : A folding partition with inde—
pendent covers, enclosing a dead air
space, and separated by an internal
mechanism operating laterally across
the face of the opening to a stack or
closed position. DO not confuse ac—
cordian partitions with serpentine
folding partitions which contain no
internal operating mechanism or dead air
space between independent covers.
BOSTWICK: A folding gate designed to main—
tain a constant height whether extended
or collapsed. This is accomplished by
use of lattice bars with free ends ,
operating on verticals .
DEEP CABINET: A cabinet which stores a
folding gate along its axis of exten—
s ion.
DRAW LATCH: A propietary term designat—
ing a type of jamb closure on an accor-
dian partition. It is only one method
of creating an effective closure at the
jamb, an action which might also be
accomplished by other mechanical means
and/or a cremone bolt or a magnetic
closure device.
FLOOR BOLTS : Vertically acting metal
bolts incorporated in portable gates ,
wide gates, double gates, or gates
without bottom track , to anchor the
fully extended gate in position .
HANGER: A device connecting a track
bracket to a structural supporting
member.
HEADER: The structure by which an accor—
dian partition is supported. It may in
turn be supported by the superstructure
and may be recessed or exposed (or
boxed in as a false header) .
INSULATION: May be any material which adds
to the mass weight or seal of an accor—
dian partition as in sound liner or
It may also be a material
sweepstrips .
designed to dampen the basic material
to create limp mass to prevent a drum
head effect and to stop vibration and
consequent sound transmission.
JACK—KNIFE : folding brace, centered ver—
ticaIIy in a gate, that holds the gate
in a fully opened position. Usually used
on wide gates without top track.
LATTICE BARS: Diagonally intersecting mem—
bers of a folding gate .
Also called
"diamond lattice bars " , "scissor bars"
or " shears"
LAZY TONG: A folding gate composed of
lattice bars, without verticals, or with
intermittent support verticals only.
Sometimes called the "diamond lattice"
this gate is used primarily for industrial
applications .
PARTITIONS
LEAD POST: An integral part of the frame df any
accordian partition, houses the latching de—
vices, lead carriers, and effects a closure at
the jamb when supplemented by a jamb molding.
Its counterpart on the opposite end of the par—
tition would be an anchor post used to fasten
the partition to the anchor janü). The lead
post is the action end of the partition and
contains the pulling devices for the operation
of that partition.
MULTIPLE MEETING POST: serves as a false jamb
when doors or partitions must be latched to
one another in a 900 attitude .
It may be
two—way, three-way, or four—way and is usually
equipped with jamb moldings for each partition
which connects to it. Multiple meeting posts
may be free floating or connected to one of
the partitions in any of the combinations .
PANTOGRAPH: A series of rigid links or straight
arms in parallelogram form to duplicate in
same, larger, or smaller form the action of a
given point and its relationship to a fixed
point to insure syrnmetry of folding action or
evenness of fold. Pantographs form the skele—
tal system of the folding partitions and may
be horizontal or vertical in nature .
PARTITIONS : Enclosures or dividers which may be
relocated , opened, or closed with a minimum
of labor. Also includes partitions of an open
nature, such as mesh partitions.
PENDANT PULL: A rod or a pair of rods extending
from the top of the leading edge of an accor—
dian partition and used to pull or push the
partition into place. The force so applied
overcomes a rolling resistance or friction
It is used on
which may exist at the track.
the more ponderous partitiöns to overcome the
extreme weight or to facilitate movement around
It may be supplied as an integral
curves .
part of the partition or furnished as an option—
al extra depending upon the manufacturer' s
Its use is usually indicative
recommendations .
of a difficult operating partition.
ROLLING POST: An optional item on an accordian
partition, if action is desired at both ends
of the partition for latching or movement, the
anchor post is substituted by a rolling post
for remote storage, pivot action, alternative
location use, or dual latching .
SELF-SUPPORTED STRUCTURAL SYSTEM: Overhead truss
or beam with integral track on two end columns .
Convenient for adding folding partitions in
remodeling work .
SEPARATOR; A metal piece that separates the Iat—
tice bars .
SHALLOW CABINET : A cabinet which stores a folding
gate at right angles to its axis of extension .
SLIDING JAMB: For an accordian partition stored in
pocket where it is difficult to anchor at the
rear Of the pocket, a false jamb usually consist—
ing of a vinyl covered plywood board equipped
with carriers and fastened to the anchor post is
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SECTION 10600
fumished. When the partition is pulled out
of the pocket, the sliding jamb board moves
forward until it contacts stops at the face
of the pocket. In the event that an acousti—
cal door or partition is furnished, the
sliding jamb board should be treated with an
equal amount of mass, weight and seal to
equal the acoustical performance of the par—
tition or it will represent a flanking path
for the escape of sound.
SOUND LINER: Generally used to indicate add—
itional material behind the exterior face
material on an accordian acoustical par—
tition, to add additional mass and weight
to the face material for greater sound
retardant qualities .
It may be composed
of Kraft products, mineral or rock wool ,
lead, steel, or other substances, and may
be an independent layer or laminated to the
basic face materials.
Its purpose is to
add greater mass and weight to the fabric
of the partition.
SOUND TRANSMISSION CLASS (STC): A single
rating derived in a prescribed manner from
sound transmission loss values. The rating
provides an estimate of the performance of
the folding partition in sound insulation
problems . An arbitrary score assigned to
a particular material or combination of
materials that make up a partition in com—
parison to other materials, a means for a
numerical comparison of the acoustical per—
formance between one partition and another.
STC is used as the criteria for compari—
son and is determined according to the prov—
isions of ASTM—E90. The score combines the
raw performance scores over a range of sound
frequencies from 125 c. p.s. to 4,000 c. p.s.
as applied to the sound transmission loss
at the varying frequencies and an arbi—
trary sliding scale as provided in the ASTM
requirements .
STACK JAMB: The jamb at the stacking end of
a sliding partition, sometimes equipped with
a lever operator.
SUPPORTED VINYL: The vinyl fabric can be
supported or unsupported. In i ts unsupported
form, it is uncontrollable for expansion and
contraction and may be easily punctured,
ripped, or torn. In order to stabilize
the vinyl, it is preferable to laminate
liquid vinyl to a fabric backing such as
jute, cotton drill oznaburg or other type Of
woven material. The weight of the fabric
is usually stated in ounces per lineal yard
of 54 inch wide material .
This weight fac—
tor is a combination of the amount of liquid
vinyl combined with the weight of the fabric
backing. When this fabric is further Iam—
inated to remain stable, it will usually
resist the tendency to develop wrinkles as
a result of expansion or contraction. Only
supported vinyl is used on quality parti—
tions .
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PARTITIONS
SWITCHES: Are a part Of the track system
and consist generally of three types :
a.
b.
c.
crossover— this switch pivots a small
section of track to allow folding par—
tition traffic to cross a given point
in either direction when such direct—
ions are opposed at a 900 angle.
glides— represent a versatility in the
accordian partition track system and
allow the travel of the partition to be
diverted by means of curves to the
left or to the right from a straight:
section Of track .
a pivot switch— pivots a section of
track and a section of partition at
900 from the straight run allowing for
storage of the partition parallel to
the wall or for use in an alternate pos—
ition adjacent to or remote from the
normal position of the partition.
SWEEPSTRIPS: Resiliant sound sealants used
at the top or bottom of a folding partition
panel Are comprised of resilisant sub—
stances such as rubber, vinyl, or felt, or
corbinations thereof to fill the space be—
tween the accordian partition and the floor
and the top of the partition and the ceil—
ing. Sweepstrips are vitally important
in masking sound of higher frequencies and
to prevent the leaking of sound around Ehe
perimeter of the partition. Sweepstrips
must be resiliant to follow the unevenness
of the floor or ceiling structure and
should be trimmed to fit the irregulari—
ties of the opening to insure against exces—
sive binding and friction .
TIEBACK: A device used to secure the stacked
accordian partition against the anchor jamb.
It may be used to create a "compressed
stack" rather than a free stack .
It may
also be used to lock the partition in the
stacked position when provided with a pad—
lock or other security device. Tiebacks
may be comprised of metal straps, vinyl
straps, or plastic belts.
TIE—BACK BAR: A bar that engages to hold the
gate in a fully collapsed position.
TRACK: A metal housing supporting a parti—
tion trolley. Provides the overhead sup—
port of folding partitions and is structured
of steel or aluminum of varying dimensions
to house the carriers that support the par—
tition .
It may provide dual or a single
rail to accomodate the carrier system. The
track structure is attached to the header to
support, guide, and stabilize the travel of
the partition across the face of the open—
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PARTITIONS
SECTION 10600
TRACK CHANNEL: A metal structure of vary-
ing gages fastened to a header, generally
by other than the manufacturer, with flat
head shingle nails, forming a place in
the ceiling for later reception of the
It may be equipped with a wide lip
track ,
on one or both edges flush with the ceil—
ing to offer a surface for contact of
accordian partition sweepstrips , to
prevent damage to acoustical ceiling sur—
face by friction of the sweepstrips .
It
may be designed to relieve the friction
action of the sweepstrips against the
ceiling for ease of operation. It
guards or preserves the ceiling and may
be referred to as a "ceiling saver" or
ceiling guard" by various manufacturers .
TROLLEY: An apparatus which carries the
weight of a folding partition and en—
ables it to move along a track.
VERTICALS: The vertical members of a
gate. These merbers serve as a slide
track for roller bearings at ends of
They are also called
lattice bars -
"upright", and "pickets .
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