3-link couplings: prototype dimensions

Martin Kelly
Posts: 112
Joined: Mon Aug 02, 2021 10:03 am

3-link couplings: prototype dimensions

Postby Martin Kelly » Mon Sep 26, 2022 9:20 am

This may be a topic that has come up before (forgive me if I'm retreading old ground).

Does anybody know the dimensions of the links in 3-link couplings in the real world - size of each individual link, diameter of the steel rod, that sort of thing? I'm probably using inappropriate terminology but I hope you get the idea. For avoidance of doubt, I'm interested in couplings used of British Railways wagons in the 1950s and 1960s.

Thank you!

Porcy Mane
Posts: 131
Joined: Wed Apr 11, 2012 4:55 pm

Re: 3-link couplings: prototype dimensions

Postby Porcy Mane » Mon Sep 26, 2022 10:16 am

3 Link coupling measurements could vary.

A read through this thread may help.

viewtopic.php?f=126&t=7068&hilit=3+link+coupling

In the meantime there is this. I'm sure I've seen a better drawing on the forum but a quick search turned nothing up.

3-Link-30¾inches.jpg


I do have a BR official drawing but have no means of scanning it at the moment.

Edit: This might be of some help.

INSTANTER-wearII copy.jpg


P
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Martin Kelly
Posts: 112
Joined: Mon Aug 02, 2021 10:03 am

Re: 3-link couplings: prototype dimensions

Postby Martin Kelly » Mon Sep 26, 2022 10:32 am

Thanks P. As you might have guessed, the motivation is because I'm thinking of home-making my own links. I see you do that too from the other topic you referenced. I want to do it properly and product scale links. Personally, I don't like over-sized ones. Seems "wrong" when we go to the effort of building the rest of a model to a high scale standard.

Porcy Mane
Posts: 131
Joined: Wed Apr 11, 2012 4:55 pm

Re: 3-link couplings: prototype dimensions

Postby Porcy Mane » Mon Sep 26, 2022 11:09 am

Hi,

This is a crop from the RCH drawing RCH1007 of 1923. The RCH drawings can be downloaded in PDF format from this page:

https://www.cs.rhul.ac.uk/~adrian/steam ... index.html

rch1007-CouplingLinksHookEtc.jpg


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Martin Kelly
Posts: 112
Joined: Mon Aug 02, 2021 10:03 am

Re: 3-link couplings: prototype dimensions

Postby Martin Kelly » Mon Sep 26, 2022 11:56 am

Oh, that's perfect. Thank you!


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