A simple, weighted mechanism to retain a shutter in the raised position once lifted.
Between services, the tension in a shutter spring can relax according to useage, size and type of shutter.
To ensure that the shutter doesn't lower during loading/unloading, this feature locks the shutter in place and prevents it from lowering.
To lower the shutter, a strap is provided which releases the mechanism and allows the shutter to lower again.
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Published: Wed 03 Oct 2018
Updated: Tue 09 Jan 2024
Author: Richard Owens
Published by: Don-Bur