Locking plates
Locking plates are manufactured usually from mild steel and fit over hexagonal nuts after these have been tightened on assembly. The locking plate is then secured on the component by a separate screw which may itself be fitted with a shakeproof or spring type of washer.
Locking plates may be used repeatedly, provided they remain a good fit, around the hexagon of the nut or the bolthead. Locking plates may be cranked, as in Fig. 16.28 or flat.
Figure 16.29 shows a selection of locking terminals where a 'Shakeproof' washer and a soldering lug are combined into one unit, thus saving assembly time. The locking teeth anchor the terminal to the base, to
- Fig. 16.28 Typical locking plate for a hexagonal nut
- (a) Flat type
- .. .if (b) Bent type
(c) Flat-wing type Fig. 16.29 Locking terminals prevent shifting of the terminal in handling, while the twisted teeth produce a multiple bite which penetrates an oxidized or painted surface to ensure good conductivity. All three types of locking terminal are generally made from phosphor bronze with a hot-tinned finish.
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