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Shear magnetic locks
Shear magnetic locks work in shear (armature plate slides into place across the magnet - without touching), rather than direct pull. Magnetic locks do not work well in shear, therefore the locking is achieved using pins in the armature plate locating in holes in the magnet.
Accurate alignment is essential.The advantages of using shear magnetic locks over other magnetic locks.
- Door can be a swing through type. No door stop is required.
- A word of warning. Although the door can be allowed to swing through, in practise most shear-locks (as they are known) require accurate alignment. Most swing through doors rely on a door closer which does not always stop the door in the same place. Hence a failure to lock.
- Shear magnetic locks use a sensor to detect correct alaignment of the magnet and armature plate before allowing the magnet to 'pull' the plate in.
All magnetic locks are fail safe devices. That mean that if power is removed the lock will open. You will always need a method of opening the door from the outside (eg keyswitch, keypad, or access control), as there is no key override.
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