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Mystery forging

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ega24/02/2020 15:30:42
1512 forum posts
123 photos

Can anyone identify the item in my photos?

The object, believed to be a steel forging rather than a casting, came into my possession during a recent factory tour in west London; overall dimensions are about 2" x 2.75".

dscn1771.jpg

dscn1772.jpg

Derek Lane24/02/2020 16:03:25
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307 forum posts
70 photos

No idea but could it be converted to use as a bottle openerdevil

pgk pgk24/02/2020 16:10:05
1668 forum posts
287 photos

door knocker?

John Paton 124/02/2020 17:17:47
236 forum posts
6 photos
Posted by pgk pgk on 24/02/2020 16:10:05:

door knocker?

Only if they are bad at spelling - it is marked DN not DK

(I'm now hiding behind the settee!)

Daniel24/02/2020 19:52:30
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260 forum posts
39 photos
Posted by Derek Lane on 24/02/2020 16:03:25:

No idea but could it be converted to use as a bottle openerdevil

+1

Derek Lane24/02/2020 20:04:21
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307 forum posts
70 photos
Posted by John Paton 1 on 24/02/2020 17:17:47:
Posted by pgk pgk on 24/02/2020 16:10:05:

door knocker?

Only if they are bad at spelling - it is marked DN not DK

(I'm now hiding behind the settee!)

It could be a Chinese made piece therefore Door Nockerwink

OK I have my coat and hat ready

Bazyle24/02/2020 20:13:56
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5013 forum posts
198 photos

steam punk mobile phone holder (EE)

Michael Gilligan24/02/2020 20:22:41
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15032 forum posts
645 photos

I don’t know what it is ... but I can guess who probably made it.

MichaelG.

.

https://www.indiamart.com/dnforge/profile.html

Edited By Michael Gilligan on 24/02/2020 20:23:04

ega24/02/2020 23:42:46
1512 forum posts
123 photos

Thank you all for your interest - and interesting suggestions. Unfortunately, I don't know whether the dnforge idea is correct but I can say that early versions of this component came from France.

As a hint, the gold-coloured ring is brazing metal.

Roderick Jenkins25/02/2020 07:42:09
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1824 forum posts
463 photos

West London factory, brazing, steel. Brompton bike hinge?

Rod

not done it yet25/02/2020 08:14:41
4170 forum posts
15 photos

Looks, to me, like an automatic feeder of some kind where the pipe attached (by brazing) only allows the device to actuate a valve when moved from its rest position, hence the hook-on/easy-detach hinge on the end.

At nearly two inches, it looks too big for a pheasant feeder.

Mike Poole25/02/2020 08:19:50
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2446 forum posts
53 photos
Posted by Roderick Jenkins on 25/02/2020 07:42:09:

West London factory, brazing, steel. Brompton bike hinge?

Rod

I think you might be the winner Rod, we will wait and see.

Mike

JasonB25/02/2020 08:32:27
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Moderator
17323 forum posts
1865 photos
1 articles

Thought they were cast steel and this puts doubt on Michael's theory

Edited By JasonB on 25/02/2020 08:36:12

Michael Gilligan25/02/2020 09:08:21
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15032 forum posts
645 photos
Posted by JasonB on 25/02/2020 08:32:27:

[…]

and this puts doubt on Michael's theory

.

< pedant alert >

... not a theory : at best an hypothesis

MichaelG.

.

P.S. ... I note that the Brompton hinge components, illustrated in the link, are marked C U

...  do those letters identify the part, or is it perhaps just plausible that identify the manufacturer ?

Edited By Michael Gilligan on 25/02/2020 09:15:38

Mike Poole25/02/2020 10:22:44
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2446 forum posts
53 photos

It looks quite complex to be a forging but I am not an expert on forging, far from it. Would it be a malleable iron casting? having a bit of a google it appears there are a few letter combinations on similar items.

Mike

John MC25/02/2020 10:42:52
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245 forum posts
36 photos

Looks like an investment casting to me. Also looks like a Brompton hinge but looking at the picture of the unmachined hinge, they look like sand castings. As for material, my money is on malleable iron.

John

SillyOldDuffer25/02/2020 10:46:05
5370 forum posts
1090 photos
Posted by Michael Gilligan on 25/02/2020 09:08:21:
Posted by JasonB on 25/02/2020 08:32:27:

[…]

and this puts doubt on Michael's theory

.

< pedant alert >

... not a theory : at best an hypothesis

MichaelG.

.

P.S. ... I note that the Brompton hinge components, illustrated in the link, are marked C U

... do those letters identify the part, or is it perhaps just plausible that identify the manufacturer ?

Edited By Michael Gilligan on 25/02/2020 09:15:38

Both right, I suspect. I doubt a cycle-maker would make a specialised forging like that himself. They're probably bought in from any of several sources. Maybe the DN number is a coincidence, maybe not. DNForge make that kind of object. If Michael can find another Forge maker using CU identifiers, I'd be convinced.

Dave

ega25/02/2020 11:10:13
1512 forum posts
123 photos
Posted by Roderick Jenkins on 25/02/2020 07:42:09:

West London factory, brazing, steel. Brompton bike hinge?

Rod

Got it in one sir!

PS I will try to find out whether it's a casting or a forging.

Edited By ega on 25/02/2020 11:12:27

ega25/02/2020 12:22:23
1512 forum posts
123 photos

I have now photographed the corresponding item in situ:

dscn1773.jpg

The letters are, again, different.

Thinking about the traditional cycle frame lug, I was struck by the short length of engagement of the tube at this vital juncture. Brompton used to warrant their frames for life although I understand this is now a nominal five years.

lfoggy25/02/2020 19:00:16
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111 forum posts
16 photos

I've had two Brompton frames fail in normal use. Both at brazed joints. To be fair to them they did replace them without any question. Given up on Bromptons now, but not becuase fo frame failure - I just no longer need the folding feature. Odd bikes to ride. Very wobbly, fast steering and hard work, particluarly up hills. And their small wheels don't like potholes !

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