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  2. Screwfix - Wikipedia

    en.wikipedia.org/wiki/Screwfix

    Screwfix Direct Limited, trading as Screwfix, is a retailer of trade tools, accessories and hardware products based in the United Kingdom. [6] Founded in 1979 as the Woodscrew Supply Company, the company was acquired in July 1999 by Kingfisher plc , which also owns B&Q , and is listed on the London Stock Exchange .

  3. Rotary combination lock - Wikipedia

    en.wikipedia.org/wiki/Rotary_combination_lock

    Wheels are typically made of a three-layer sandwich. The outer layers, known as the wheel case, contain the gate and surround the externally-toothed wheel center, change key cam, and lever arms. When a change key is inserted into the lock mechanism, it forces apart the lever arms, which then permits the wheel center to rotate freely.

  4. Wheellock - Wikipedia

    en.wikipedia.org/wiki/Wheellock

    The wheellock works by spinning a spring-loaded steel wheel against a piece of pyrite to generate intense sparks, which ignite gunpowder in a pan, which flashes through a small touchhole to ignite the main charge in the firearm's barrel. The pyrite is clamped in vise jaws on a spring-loaded arm (or 'dog'), which rests on the pan cover. When the ...

  5. Wheel clamp - Wikipedia

    en.wikipedia.org/wiki/Wheel_clamp

    A wheel clamp, also known as wheel boot, parking boot, or Denver boot, [1] [2] is a device that is designed to prevent motor vehicles from being moved. In its most common form, it consists of a clamp that surrounds a vehicle wheel, designed to prevent removal of both itself and the wheel.

  6. Electric gate - Wikipedia

    en.wikipedia.org/wiki/Electric_gate

    Most gate kits can be fitted with safety equipment so that these limits are achieved and so cover that part of EN13241-1. In September 2010, following two incidents in Bridgend and Manchester , when children were killed by sliding gates, the UK Health and Safety Executive issued 2 safety notices aimed at gate manufacturers and installers ...

  7. Turnstile - Wikipedia

    en.wikipedia.org/wiki/Turnstile

    A turnstile (also called a gateline, baffle gate, automated gate, turn gate in some regions) is a form of gate which allows one person to pass at a time. A turnstile can be configured to enforce one-way human traffic .

  8. Stackfreed - Wikipedia

    en.wikipedia.org/wiki/Stackfreed

    A stackfreed is a simple spring-loaded cam mechanism used in some of the earliest antique spring-driven clocks and watches to even out the force of the mainspring, to improve timekeeping accuracy. [ 1 ] [ 2 ] [ 3 ] Stackfreeds were used in some German clocks and watches from the 16th to the 17th century, [ 4 ] before they were replaced in later ...

  9. Portcullis - Wikipedia

    en.wikipedia.org/wiki/Portcullis

    Portcullis at Desmond Castle, Adare, County Limerick, Ireland The inner portcullis of the Torre dell'Elefante in Cagliari, Sardinia, Italy A portcullis (from Old French porte coleice ' sliding gate ') is a heavy, vertically closing gate typically found in medieval fortifications. [1]

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