ear defender

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Ear Defender

 

a means of personal protection from the harmful effects of noise; such devices fall under the classification of protective clothing and equipment. Two types of ear defenders are distinguished: the internal type, which is inserted into the outer ear canal, and the external type, which covers the entire outer ear. Internal ear defenders are plugs made of special fabric, extremely fine glass wool, ordinary cotton wadding and gauze, rubber, or plastic. External ear defenders may be in the form of a helmet liner, used to protect aviators’ hearing, or protective cups, similar in appearance to headphones, consisting of two shells or cups linked to one another. The shells are made of several layers of sound-absorbing materials, such as thick felt, cardboard, rubber, or vinyl chloride, with fillers between them, such as oakum or slag wool.

The use of ear defenders reduces the effective noise level at least 20-30 decibels. The noise spectrum is also less harmful because high-frequency sounds are attenuated.

ear defender

ear defenderclick for a larger image
Any device, such as an earplug or an earmuff, used to protect the human ear from loud noises, like that of jet engines, that may damage hearing. Combined earplugs and earmuffs provide the maximum ear protection. Another combination of helmet and neoprene earplugs is equally effective. The illustration indicates the maximum attenuation level of some of the protection devices.
References in periodicals archive ?
Keep ears warm with these cheeky Piste Off earmuffs, PS8, from Next, model also wears puffa jacket, PS55; scarf, PS18; mittens, PS10; leggings, PS35; tartan bag, PS35 and ankle boots, PS35
In fact, the Animal Rescue Fund of the Hamptons is so concerned about the well-being of its 150 furry "residents" that executive director Sara Davidson is also considering noise-reducing earmuffs for the animals.
Participants wearing 3M earmuffs did a better job hearing 62 unrelated words recorded at a noisy construction site compared with what those wearing Etkes earmuffs did.
Earmuffs that cover the entire ear (30 dB attenuation).
All survey subjects reported wearing a cranial helmet with earmuffs, but 75 percent of the subjects had been issued a questionable size (most wore the largest of four sizes available).
All survey subjects reported wearing a cranial helmet with earmuffs, but 75 percent of subjects were issued a questionable size (most wore the largest of four sizes available), and 41 percent of earcup cushions and foam inserts were deteriorated, hard, creased, or missing.
The Impact[TM] Sport Ultraslim Sound Amplification Earmuffs are designed to amplify ambient noise while also providing NRR 22 protection against hazardous noise.
Participants in the "Just Try It" challenge will don earmuffs and blindfolds to go round the course with a guide.
There is a wide range of HPDs available, designed for specific applications and/or worker preference, ranging from high-visibility, ultraslim and cap-mounted earmuffs to earplugs that adapt to the unique contours of each ear canal and banded earplugs that can be quickly inserted during intermittent noise.
Its glasses connect directly to the earmuffs, which not only eliminates pressure points against the head, but also enhances hearing protection by as must as three to seven decibels, a spokesman says.
Now some bright spark has ruled the noise at these grounds is above 92 decibles, the safe limit, and so earmuffs could become compulsory.