> On 26 Feb 2009, at 14:16, Bru wrote: > > > The trolley lock device, or at least the type of which I know, is > > indeed an > > inductive loop which releases a brake on one or more of the trolley > > wheels. > > The brake can only be released with the right key. AFAIK, there are > no > > 'gizmos' involved in releasing the brake, it's an electro-magnetic > > release > > of a sprung loaded brake which is then reset mechanically. > > > That's what I expected to see when we had one unlocked at Rugby, but > no, it didn't involve any kind of mechanical, special spanner type > jobby, it was a flat plastic box he held next to the wheel, and > pushed a button whilst shoving the brake block back into the wheel > housing. Presumably another induction system to hold a detent out of > the way whilst the brake was reset.
Interesting! Bru
