Fitting Backflap hinges

[Roach1948]

I am looking to complete a cabin table with leaves that flip over on the top to make a smaller table with fiddle rails; much better than drop down leaves inho.

I think I will use backflap hinges but was wondering how these fit as there is a small knuckle/notch on the middle of each hinge that articulates when the table is folded out. I think this needs needs to be accommodated into the table when folded out - I assume by chiselling out for them. Would anybody that has fitted a backflap hinge offer advice on how to fit?

 

[Scarboroughsloop]

I think the knuckle on my hinges face up so do not need to be chiselled into the wood. I'll have a proper look this weekend.

 

[Peterduck]

The appropriate hinge for this situation is one which has a double knuckle, so that when it is folded up the hinge adopts a square 'U' shape. The knuckles are on the underside so that the top surface is smooth, Each knuckle only has to adopt a 90 degree fold, so the combination makes the 180 degree fold. Look in your Yellow Pages under 'Cabinetmaker's Supplies' and you should be able to find some. If they are just too elusive, try two sets of butt hinges separated by a narrow strip of timber compatible with the rest of the table. The hinges should, of course, be offset from each other on the two sides of the strip. Another alternative is a piano hinge set into the edge of the table top. These gain strength by being continuous, and using many screws to attach them to the top boards. There will still be half of the knuckle diameter exposed, but if a fairly fine hinge is used this should not present a problem.
Peter.

 

[Roach1948]

Well I think it is the type of hinge that I have - called a "counter flap" hinge here. They are dovetail wedge shaped.

The trouble is that knuckle. As far as I can see I need to chisel out a little notch for it to articulate the 90 degrees properly if the hingy bit is to butt-up to the edge of the table flush. I can't seem to find find any instructions online of how to fit these types of hinges online.

Can you explian the offsetting thing again? - the wood is 1inch thick mahog (thanks BurgundyBen!) and I was thinking of making it quite symetrical.

 

[Captain Coochie]

You do need to cut out a notch for the counter flap hinges to work properly .

 

[fergie_mac66]

you dont need back flaps you need counter tops or bar tops ..still need cutting in tho

http://www.handles4doors.co.uk/product/index.aspx?ProductID=15316&CatID=659

 

[Roach1948]

thanks a lot - will get started

 

[nortonmotors]

Flap hinge

When building my chart table, I used two flap hinges so that it would lift over-centre and stay open.
The attached photo shows them inset into the table ; careful chiselling is needed around the dovetails

 

[Amulet]

I used these.

This is my practice attempt at fitting them.