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Bayonet mount
From Wikipedia, the free encyclopedia
A bayonet mount or bayonet connector is a fastening mechanism that relies on mated surfaces; a male side with one or more pins or slots, and a female receptor with matching slots and a spring that maintains a clamping force. To couple the two surfaces, users are expected to align the pin(s) on the male with the slot(s) on the female and push the two together. Once the pins reach the end of the slot, the two surfaces are turned in opposite directions to guide the pin into a perpendicular slot that prevents it from being removed. The spring then holds the pin in this position to prevent it from backing out. To disconnect the two surfaces the user pushes the two surfaces together to overcome the spring and reverse the locking turn.
The strength of the joint relies solely on the shear strength of the pins used and can be less effective than other fastening mechanisms. It makes up for this deficiency by the speed with which practiced users can connect them and the fact that it cannot be cross-threaded.
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This style of connector was named after its initial implementation for soldiers who need to mount bayonets to the ends of their rifles in a hurry. The same need also applies to photographers who may need to change lenses quickly.
Several classes of electrical cable connectors,including audio, video, and data cables uses bayonet connectors. Examples include BNC, C, and ST connectors.
Home light bulbs (230/240V mains voltage) in Australia, Ireland, New Zealand and the UK also have this type of "B" base, as well as the Edison screw "E" base used in the United States, Japan and other countries. It is also very common worldwide in automotive lighting and other small indicators, and in many flashlights.
| Type | IEC | DIN |
|---|---|---|
| B15d | IEC 60061-1 (7004-11) | DIN 49721 |
| BA15d | IEC 7004-11 A | DIN 49720 |
| BA15s | IEC 7004-11 A | DIN 49720 |
| BA20d | IEC 7004-12 | DIN 49730 |
| B21s-4 | ||
| B22d | IEC 60061-1 (7004-10) | |
| B24s-3 | ||
| GU10 | IEC 60061-1 (7004-121) | |
| GZ10 | IEC 60061-1 (7004-120) |
- IEC 61184: Bayonet lampholders, International Electrotechnical Commission, 1997. (also: BS EN 61184) – specifies requirements and tests for the B15 and B22 bayonet holders for light bulbs used in some Commonwealth countries