An electromagnetic coil is an electrical conductor such as a wire in the shape of a coil. Electromagnetic coils are used in electrical engineering, in applications where electric currents interact with magnetic fields, in devices such as electric motors, generators, inductors, electromagnets, transformers, sensor coils such as in medical MRI imaging machines. Either an electric current is passed through the wire of the coil to generate a magnetic field, or conversely, an external time-varying magnetic field through the interior of the coil generates an EMF (voltage) in the conductor.
An inductor, also called a coil, choke, or reactor, is a passive two-terminal electrical component that stores energy in a magnetic field when an electric current flows through it. An inductor typically consists of an insulated wire wound into a coil.
A wire is a flexible, round, bar of metal. Wires are commonly formed by drawing the metal through a hole in a die or draw plate. Wire gauges come in various standard sizes, as expressed in terms of a gauge number or cross-sectional area.
A Rogowski coil, named after Walter Rogowski, is an electrical device for measuring alternating current (AC) or high-speed current pulses. It sometimes consists of a helical coil of wire with the lead from one end returning through the centre of the coil to the other end so that both terminals are at the same end of the coil. This approach is sometimes referred to as a counter-wound Rogowski.
A spring is a device consisting of an elastic but largely rigid material bent or molded into a form that can return into shape after being compressed or extended. Springs can store energy when compressed. In everyday use, the term most often refers to coil springs, but there are many different spring designs. Modern springs are typically manufactured from spring steel. An example of a non-metallic spring is the bow, made traditionally of flexible yew wood, which when drawn stores energy to propel an arrow.
A coil spring is a mechanical device that is typically used to store energy and subsequently release it, to absorb shock, or to maintain a force between contacting surfaces. They are made of an elastic material formed into the shape of a helix that returns to its natural length when unloaded.
A bedroom or bedchamber is a room situated within a residential or accommodation unit characterized by its usage for sleeping. A typical western bedroom contains as bedroom furniture one or two beds, a clothes closet, and bedside table and dressing table, both of which usually contain drawers. Except in bungalows, ranch style homes, ground floor apartments, or one-storey motels, bedrooms are usually on one of the floors of a dwelling that is above ground level. Beds range from a crib for an infant; a single or twin bed for a toddler, child, teenager or single adult; to bigger sizes like a full, double, queen, king or California king). Beds and bedrooms are often devised to create barriers to insects and vermin, especially mosquitoes, and to dampen or contain light or noise to aid sleep and privacy.
Upholstery is the work of providing furniture, especially seats, with padding, springs, webbing, and fabric or leather covers. The word also refers to the materials used to upholster something.
A mattress is a large, usually rectangular pad for supporting a person lying down, especially for sleeping. It is designed to be used as a bed, or on a bed frame as part of a bed. Mattresses may consist of a quilted or similarly fastened case, usually of heavy cloth, containing materials such as hair, straw, cotton, foam rubber, or a framework of metal springs. Mattresses may also be filled with air or water.
A box-spring is a type of bed base typically consisting of a sturdy wooden frame covered in cloth and containing springs. Usually, the box-spring is placed on top of a wooden or metal bedframe that sits on the floor and acts as a brace, except in the UK where the divan is more often fitted with small casters. The box-spring is usually the same size as the much softer mattress placed on it. Working together, the box-spring and mattress make up a bed. It is common to find a box-spring and mattress being used together without the support of a frame underneath, the box spring being mounted directly on casters standing on the floor.
Upholstery coil springs are an important part of most modern upholstery. The consumer usually never sees the construction features of an upholstered piece. The overall quality of the materials and construction dictate the comfort level of an upholstered piece and its ability to satisfy the consumer over the long term. A basic upholstered piece may be composed of a frame, springs, foam, cushioning, padding, and textiles.
A sofa bed or sofa-bed is a multifunctional furniture typically consisting of a sofa or couch that, underneath its seating cushions, hides a metal frame and thin mattress that can be unfolded or opened up to make a bed. A western-style futon differs from a sofa bed, although sofa beds using futon mattresses are common.
The Simmons Bedding Company is an American major manufacturer of mattresses and related bedding products, based in Atlanta, Georgia. The company was founded in 1870. Simmons' flagship brand is Beautyrest. In addition to operating 18 manufacturing facilities in the United States and Puerto Rico, the company licenses its products internationally. According to a Simmons press release, net sales for 2005 were $855 million, and its revenue was $1.13 billion in 2007 and $1.228 billion in 2013. In 2011, Simmons ranked in third place among U.S. mattress manufacturers, with a 15.7 percent market share. In 2012, Simmons and its sister company Serta International were acquired by American private equity company Advent International. As of 2022, Simmons is a subsidiary of the American company Serta Simmons Bedding, LLC of Doraville, Georgia. On January 23, 2023, Serta Simmons Bedding filed for Chapter 11 bankruptcy.
An electric blanket is a blanket that contains integrated electrical heating wires. Types include underblankets, overblankets, throws, and duvets. An electric underblanket is placed above the mattress and below the bottom bed sheet. This is the most common type in the UK and Commonwealth countries, where it is known by default as an "electric blanket"; in the U.S. and Canada, where it is less common, it is called an electric heated mattress pad. An electric overblanket is placed above the top bed sheet, and is the most common type in the U.S. and Canada, where it is called an "electric blanket".
Leggett & Platt (L&P), based in Carthage, Missouri, is an American diversified manufacturer that designs and produces various engineered components and products that can be found in homes and automobiles. The firm was founded in 1883, and consists of 15 business units, 20,000 employee-partners, and 135 manufacturing facilities located in 18 countries.
A bed base, sometimes called a foundation, is the part of a bed that supports the mattress. The bed base can itself be held in place and framed by the bedstead. In the United States, box-spring bed bases are very common. In Europe, sprung slats are much more common.
Marshall coils, also known as encased coils or encased springs, are component parts of a mattress in which each coil is separately wrapped in a textile material.
Vispring, formerly known as Vi-Spring, is a bed company founded in 1901 in Eagle Street, Holborn, London. Manufacturing mattresses and beds made of natural materials. Part of Vispring's notability comes from being the first English bed makers to use the patent of Canadian-born engineer, James Marshall pocketed spring coil now commonly referred to as the Marshall coil. By 1914 Marshall Mattress' mattress collections were found in luxurious hotels, clubs and ocean liners, including The Queen Mary & The Titanic.
Shifman Mattress Company is a manufacturer and distributor of handcrafted sleeping mattresses. The mattresses are made using hand-tufting techniques, eight-way hand-tied boxsprings, natural materials, and are two-sided. The company's headquarters are located in Newark, New Jersey.
Zalmon Gilbert Simmons II was an American businessman, manufacturer, philanthropist and innovator. He was the president of The Simmons Company from 1910 to 1932. He inherited the company in 1910 from his father, Simmons Company founder Zalmon G. Simmons. Z.G. II was commonly referred to as "the Chief" for his ability to recognize possibilities and make decisions that many felt were foolish but would prove to be extremely profitable. It is reported that Simmons once wagered an automobile a hole in a game of golf. His unshakable character increased the company's profits from less than $5,000,000, when he became president, to over $40,000,000 at the peak of his incumbency and revolutionized the bedding industry.
