On 29/11/2012 13:27, Dave Liquorice wrote:
On Wed, 28 Nov 2012 16:35:40 +0000, usenet2012 wrote:

Our Tesco locks the wheels as you go up/down their travelators. Damned
annoying when in a hurry though the alternative is probably too amusing
a prospect to be allowed.

Normally defeatable by lifting the rear wheels but trollies are damn
heavy empty and as you say it could be ammusing.

I'd like to know how the "trollies won't go past this point" thing works.
I know some have bits of "travelator grid" the the wheels bind in but the
Hexham Tesco between it and Aldi is just an ordinary mix of paving slabs,
concrete or tarmac. Bit of steel buried and magnet in the hub?


The lidl and asda ones by me have an iduction coil under the path.
It probably activates a motor in the wheels that winds the pins out of
the hub that stop the wheels going.