Metal fixings in mortar between bricks

Hi, I'm currently changing an old post and the fixings that were on the wood are in between the bricks and I'm struggling to get them out.
I've knocked them to the sides and they move when hit but don't seem to be loosening.
Ive picked away at the mortar either side and still no luck.
Any ideas how best to get them out? Do I need to keep going with chipping away either side? I don't know whether there's a depth I should/shouldn't reach.
Thanks in advance

 

what happens if you tap it inwards?

 

Nothing, it doesn't go in deeper than it already is

 

Surely they had lag bolts and rawl plugs back in the day... and it definitely won't slide along left or right?

 

I pulled one of them out the other day- had to drill into the (lime) mortar around it to get it to move. But that was in a 200 year old house, that brickwork looks much more recent

 

Thanks I'll keep at it and see whether I have any luck. Any idea what they're called?

 

Thanks for the replies, managed the finally get them out after drilling and chiselling!

 

what did it look like, the fixing, and how did you get it out.

 

I've attached a picture. The bit at the bottom of the picture went alongside the piece of wood and a screw then went in there.
I just kept chipping away and drilling at the mortar and using a mallet to knock them from side to side where I could and eventually they came out - I hope I don't run in to any more any time soon!

 

Woah, that's some old school ironmongery.

 

I've got an old rusty, hooked one in my back garden wall, probably been there since the house was built in 1873, but as it is well above head height I'm leaving it in situ.

 

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