A shutter retention catch is a simple weighted mechanism designed to hold a roller shutter securely in the raised position once lifted. It provides a predictable method of restraint when working around open shutter apertures.
Over time, and between routine services, the tension in a shutter spring can reduce depending on usage, shutter size and shutter type. A reduction in spring counterbalance can increase the likelihood of the shutter descending under its own weight.
This mechanism locks the raised shutter in place to help prevent unintended lowering during loading or unloading. This adds a basic but important layer of operational safety where shutter stability is required.
To lower the shutter, an attached strap is used to disengage the catch, allowing the shutter to descend in a controlled manner.
FAQs
What does a shutter retention catch do?
It holds a raised roller shutter in position so it cannot drop unexpectedly while loading or unloading.
Why can a shutter drop if it is not restrained?
Shutter springs gradually lose tension through normal use. As the counterbalance weakens, the shutter may no longer stay fully raised without mechanical assistance.
How is the shutter released?
An integrated strap is used to release the retention mechanism so the shutter can be lowered safely.
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