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Locking of two tubes is an easy engineering problem to solve.

I have a set of small hole diameter measuring devices by Moore and Wright they 
use the pinciple which is, I am sure, likeley to be used in the German 
version; or will serve well anyway.

Consider a threaded rod in a tube with a wheel on the threaded portion at one 
end such that turning the wheel pulls the threaded rod in the tube.  At the 
other end of the tube you have two holes in the side of the tube with two 
hardened balls (for Ball bearings)inside the tube but poking out partially.  
The threaded rod is made into an inverted conical taper where the balls are,  
thus when the rod is pulled down the tube the balls are pushed outwards.

This principle is how the inner tube of a Bygrave device can be locked.  The 
tapered rod can push two rods or balls or any shaped form of side pieces 
outwards against the inner tube, thus slightly bending it into an elipse 
which will bind with the outer tube in which it rotates/slides and hence 
locking it.

Douglas Denny.
Chichester. England.
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[Sent from archive by: douglas.denny-AT-btopenworld.com]


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