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Dzus spiral cam fasteners—named after their inventor William Dzus (pronounced /zuːs/)[1]—are a type of proprietary quarter-turn lock fastener that is often used to secure skin panels on aircraft and other high-performance vehicles. Turnlock fasteners are also referred to as quick-action panel fasteners.[2]
Invented and patented by an American engineer of Ukrainian descent William Dzus (Volodymyr Dzhus) in the early 1930s,[1] Dzus fasteners are also used to secure plates, doors, and panels that require frequent removal for inspection and servicing. These fasteners are notable in that they are of an 'over-centre' design, requiring positive sustained torque to unfasten. Thus, any minor disturbance to the fastener (e.g. vibration) will tend to correct itself rather than proceed to further loosening as it would in threaded fasteners. Turnlock fasteners are available in several different styles and are usually referred to by the manufacturer's trade name. Some of the most common are DZUS, Camloc, and Airloc.[3]
How it works[edit]
Figures 1–4 show the original Dzus fastener holding an aircraft cowling (10) to a fuselage (11).[4]
The cowling (10) and fuselage (11) can be quickly fastened together by bringing the cowling (10) to the fuselage (11), placing the shank (13) of the button (12) into the hole in the fuselage (25). The button (12) is turned by a screwdriver in its slot (21) to a position in which the slots (16) will hold the spring (22). As button (12) turns, the walls of its spiral slots (16) act as cams, and pull the intermediate section of the spring (22) from its relaxed position up into the slot's holes (18) past the slot's projections (17). The projection (17) in the slots (16) will resist reverse rotation of the button (12) and thus prevent unintentional separation of the cowling (10) and fuselage (11) from vibration. Optionally, to prevent noise, strips of felt or rubber (26) may be between the cowling (10) and fuselage (11).
To unfasten the cowling (10) from the fuselage (11) turn the button (12) one-quarter of a turn. This will disengage the button (12) from the spring (22). The holes (18) are large-enough to allow the spring (22) to clear the projection (17) either while engaging the button (12) or disengaging it. The end of the shank (13) that has the slots (16) must be well-rounded so spring (22) can easily enter its slots (16).
The Dzus fastener's removable part is a button (12) that can turn if a screwdriver is placed in the slot (21) of its head (14). The button (12) is held to the cowling (10) by its head (14) and a groove (19). The groove assures that the button (12) does not fall off the cowling (10) when the cowling is unfastened. The hole (25) includes a finish or material so that the button (12) does not bind when turned.
The stationary part of the Dzus fastener has a spring (22) with coils (23) riveted (24) to the fuselage (11). The part of the spring (22) between the rivets is arched.
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The button's shank (13) has a tubular bore (15) opposite the head (14). The shank (13) has spiral bayonet slots (16) opposite each to other to receive the spring (22) of the stationary part of the fastener. When fastened, the slots (16) provide holes (18) that surround and hold the stationary spring (22). A projection (17) in the slots (16) holds the fastener closed by pressing the head (14) against the cowling (10) toward the spring (22) fastened to the fuselage (11).
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One common improvement places the female parts in a small bucket to reduce entry of water. Another is to make it easier to open and close: For example, many modern Dzus fasteners use self-centering screw-drivers. Other improvements reduce the cost. For example, changing the spring so it can be secured to the female hole avoids the cost of rivets. Some manufacturers die-cast the button rather than machining it.
References[edit]
- ^ ab'The History of West Islip: The Dzus Fastner Co. Inc'. WestIslipPatch. Retrieved 2013-09-16.
- ^DFCI Company History
- ^'MIL-F-25173A, Military Specification: Fastener, Control Panel, Aircraft Equipment (16-Feb-1956)'. US Department of Defense. 16 February 1956. Retrieved 2013-09-16.
- ^Dzus, William. 'Fastening device'. U.S. Government. Retrieved 9 September 2015 – via Google Patents.