Upvc sash window stuck

dk3

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Hi, anyone have an idea of how to get this window open. It only opens a small bit and not as far as the sash restrictors. There are 2 knobs, pic shows one in place and one screwed out. The hole left of the one screwed out doesn't look as if it was done at manufacture, seems a bit untidy. These 2 knobs slide across a small bit to the inside, could they be some kind of lock?
Many thanks for any help, want to get this window open fully in this heat!
 

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Have you tried sliding them both towards the inside , holding them there , then trying to open the window?
 
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As sircerebus666 says, slide both knobs towards the centre of the window, the sash should then tilt in ( its to enable easy cleaning ) , beware , it may not have anything to stop it slamming straight done .. ideally it should have a tilt restrictor arm but some don't.

If how ever it is just the sliding up and down that is the issue , my guess would be that the ' pivot shoe ' that the spiral spring is located in has broken, I've seen it a few times and it can be a right pig to change. If you can get it to tilt inwards , look down each edge and you will see the spring, follow the spring down and you should see the plastic ' pivot shoe ' give it a good inspection and see if any of the retaining lugs for the spring have broken off
 

dk3

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Many thanks for replies. It does tilt inwards, I did it with a bit more force than I had been. I have wooden shutters and the frame for those doesn't allow it to tilt in so far that I could see inspect the edge fully. It does sound like that is the issue though as there in a problem getting it up and down. Thanks again and will just live with it for now.
 
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