Little dictionary of technical terms for Schwepper lock products

Essential functional components of mortises

 
What is a 'handle hub' or 'follower'?

The handle hub takes the square spindle of the handle in order to retract the latch inside the lock through the turning motion of the same. This process allows the opening of the door.

The shipbuilding norm prescribes a 9mm square. Schwepper supplies also with 8mm square on request.
What is a 'lock latch'?

The lock latch keeps the door shut. In order to open the door, it must be retracted. There are several designs for the lock latch:

  • single piece latch
  • anti-vibration latch
  • rolling latch
The latch protrusion describes the length, that the latch sticks out. For further information please see further below.
 
What is a 'deadbolt' ?

The deadbolt prevents the opening of the door and regulates the access rights through the turning motion of the cylinder by key. The deadbolt is being driven out or retracted through the turning motion.
What is a 'faceplate' or 'front plate' ?

The faceplate is the visible part of the lockcase. The faceplate, the latch and the deadbolt are the only visble parts of a mortise
 
What is a 'WC hub' ?

The WC hub takes the square spindle of the olive or thumbturn, that retracts or drives out the deadbolt from the inside - analogue to the turning motion of the cylinder.

The shipbuilding norm prescribes a 7mm square. Schwepper supplies also with 8mm square on request.

 

Essential dimensions of mortises

What is the 'backset'' ?

The backset is the distance from the top edge of the faceplate to the center of the cylinder hole respectively handle hub square.
What is the 'distancing' ?

The distancing renders the dimension from the center of the handle hub to the center of the profile cylinder hole / WC-hub hole / key hole.

The standard dimension in shipbuilding is 75mm.
 

 
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