Tri-wing
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Tri-Wing , also TriWing , abbreviated TW, is a screw head drive developed by the Phillips Screw Company . The shape is reminiscent of a propeller , the wide blades of which do not point to the center , like a three-bladed toy wind turbine .
The planned areas of application are aircraft and military equipment . The screw drive can also be found on small electrical appliances , where it makes it more difficult for unauthorized persons to open it in the form of a security screw , e.g. B. with plug- in power supplies . Since suitable screwdrivers have been commercially available in Europe since the mid-1990s, the screw head only partially fulfills this purpose.
In the meantime, other three-blade screw drives predominate, which come to Europe through products from Southeast Asia, see section 'Y-Type'.
The corresponding variant of the Tri-Wing with four wings is called the Torq-Set .
Y-type
This screw head drive is called Y-Type (English, Chinese: Y 型), also Y 形 (Chinese, translated: Y-shaped), Tri-Point (designation by US tool manufacturers) or Trigram . In North America and Europe, however, it is often named after the aforementioned Tri-Wing screw drive .
These names include at least two different, but only slightly different, variants. What they all have in common is that the center lines of the three blades meet in the center like a three-bladed propeller . One variant has rounded corners at the point where the wings meet. This makes it similar in design to the Phillips screw drive , but has only three blades.
The screw drive is available in different sizes for different screw diameters. The sizes Y 2.0, Y 2.5, Y 3.0, Y 4, Y 5 and Y 6 are common.
Y-type screw drives are often used in electrical devices from Southeast Asia that are operated with 230 V mains voltage, e.g. B. timers or plug-in power supplies. But they are also used in laptops and their accessories, e.g. B. with Microdrive drives or inside the Apple MacBook Pro . They take on the function of a security screw to make it difficult to open devices. The use by Nintendo in their game consoles, z. B. DS / DS lite , Game Boy Advance / Advance SP , Wii , and by Fujifilm on their cameras, e.g. B. in the FinePix series made the tri-point screw drive better known because the original tri-wing screwdrivers do not fit into the small slots.
Larger screws require larger Y-type screwdrivers, which have rarely been available until now (as of 2014). Thus, the effect as a security screw still appears. The smaller sizes of the Tri-Wing can be used as a substitute, but screwdrivers or the screw head can be damaged when loosening the screw.
See also
Individual evidence
- ↑ a b Tri-Wing, areas of application for the screw head drive . Accessed February 2, 2014
- ↑ Guide screw profiles. In Wiha (ed.), Online information . Accessed August 8, 2014