Simrad EC150-3C, Руководство по установке

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74
438371/A
Using self-locking taps
The mounting rings delivered by Kongsberg Maritime are fitted with self-locking
threads. Normal screws are designed to be loosened. It is however important to avoid
accidental loosening, especially when the installation is subjected to dynamic stress. For
this reason, additional locking devices are required. These are often expensive, they can
only be used once, or react critically to temperature changes.
Introduction to Emuge self-locking threads
Emuge self-lock is a tap design with an integrated locking feature. Standard metric
bolts are used. The internal thread provides a self-locking connection, which can be
used repeatedly. It is not necessary to involve a secondary locking device (for example
chemical, nylon or mechanical). The Emuge self-lock bolts withstand the vibrations
better than standard (metric) threads, because the thread contact stops the sideway
movement. The special design of the internal thread profile also provides a more even
distribution of the tightening stress over the whole thread length. The assembly is just as
easy as with a normal (metric) thread. There is no general applicable standard (e.g. DIN
standard) for the
Emuge self-lock thread.
A
Emuge’s saw-tooth profile up to pitch P ≤ 0.7 mm
B Emuge’s saw-tooth profile up to pitch P >0.7 mm
C
Standard thread
D
External thread
E
Internal thread
The advantages of using Emuge self-lock thread include:
• The thread locking feature if integrated in the internal thread
• Modified profile with ramp surface in the direction of stress
• 30° ramp surface provides self-locking effect
• Easy assembly
• No assembly errors (forgetting the locking device) possible
• Use the standard external threads (screws) with tolerance class "medium"
Simrad EC150-3C Installation Manual