A mattress is a mat or pad, usually placed atop a
bed, upon which to sleep or lie.
Though a mattress may be placed directly on the floor, it is usually
placed atop a platform (such as a bed or a metal spring foundation) to
be further from the ground. Historically, mattresses have been filled
with a variety of natural materials, including straw and feathers.
Modern mattresses usually contain either an innerspring core or
materials such as latex, viscoelastic, or other polyurethane-type foams.
Mattresses may also be filled with air or water.
Spring mattress core
The core of the mattress supports the sleeper’s body. Modern spring
mattress cores, often called "innersprings," are made up of steel coil
springs, or "coils."
The gauge of the coils is another factor which determines firmness and
support. Coils are measured in quarter increments. The lower the number,
the thicker the spring. In general, higher-quality mattress coils have a
14-gauge (1.63 mm) diameter. Coils of 14 to 15.5-gauge (1.63 to 1.37 mm)
give more easily under pressure, while a 12.5-gauge (1.94 mm) coil, the
thickest typically available, feels quite firm.
Connections between the coils help the mattress retain its shape. Most
coils are connected by interconnecting wires; pocketed coils are not
connected, but the pockets preserve the mattress shape.
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Alphabetical Listings
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All American Adjustable Beds
PO Box 3846, San Rafael, CA 415 499-0901
Back Shop & Sleep Ctr
917 C St, San Rafael, CA 415 459-0499
Duxiana-The Dux Bed
901 A St # A, San Rafael, CA 415 459-0365
Eric Frey-Tempur-Pedic
1618 4th St, San Rafael, CA 415 459-6666
Green Fusion Design Ctr
14 Greenfield Ave, San Anselmo, CA 415 454-0174
Mancini's Sleep World
28 Bellam Blvd, San Rafael, CA 415 256-9800
Mary's Futon & Wallbeds
4100 Redwood Hwy, San Rafael, CA 415 472-2919
Mattress Discounters
733 Francisco Blvd E, San Rafael, CA 415 451-1806
P M Sleep Ctr
115 Bellam Blvd, San Rafael, CA 415 457-9900
Tempurpedic Showroom
1559 S Novato Blvd, Novato, CA 415 892-9299
Sleep Train
232 Vintage Way, Novato, CA 415 897-9266
Sleep Train
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530 Francisco Blvd W # D, San Rafael, CA 415 256-2538 |
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Types of coils
There are four different types of mattress coils:
Bonnell coils are the oldest and most common. First adapted from buggy
seat springs of the 19th century, they are still prevalent in less
expensive mattresses. Bonnell coils are hourglass-shaped, and the ends
of the wire are knotted or wrapped around the top and bottom circular
portion of the coil and self-tied.
Marshall coils, also called "pocketed coils," are each wrapped in a
fabric encasement and usually are tempered, or in the case of the
Simmons Beautyrest carbon magnesium is added. Some manufacturers
pre-compress these coils, which makes the mattress firmer and allows
for motion separation between the sides of the bed.
Offset coils are designed to hinge, thus conforming to body shape.
They are very sturdy, stable innersprings that provide great support.
Continuous coils Or Mira-coils, Work by a hinging effect, similar to
that of offset coils. In a basic sense a continuous coil is simply
that, one continuous coil in and up and down fashion forming one row
(usually from head to toe) of what appear to be individual coils. The
advantages of how firm a support the continuous coil provides it is
somewhat tempered with the 'noise' associated from a typical mira coil
unit. |
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