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 Post subject: What is the name of...
PostPosted: Mon Mar 29, 2010 4:43 pm 
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...a patent double-screw that operates the frame of an expanding table?

Ralph :wink:

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PostPosted: Mon Mar 29, 2010 4:51 pm 
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Twin Drive Screw

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PostPosted: Mon Mar 29, 2010 10:15 pm 
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Not what I am looking for, it has a patented name...

... I think I could get to keep the points again 8)

Ralph :wink:

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PostPosted: Mon Mar 29, 2010 10:37 pm 
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Acme screw.

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 Post subject:
PostPosted: Mon Mar 29, 2010 10:39 pm 
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Keep trying...

Ralph :wink:

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PostPosted: Tue Mar 30, 2010 6:43 am 
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I found only one website on the net that explains this screw by
a cabinet maker in West Virginia, after refining my Google search a few times.

I did learn something today. :-D

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PostPosted: Tue Mar 30, 2010 8:57 am 
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A bipolar screw? :D

How about a turnbuckle screw??

I'm really not sure what you are talking about unless it is a screw that has both right hand and left hand threads.

Rog

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PostPosted: Tue Mar 30, 2010 12:53 pm 
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Hey Ralph,

I'm assuming that it's like the jack screw used in a scissor jack, but I haven't the foggiest idea of what it's called.

Tom

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PostPosted: Tue Mar 30, 2010 2:02 pm 
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Acme Threaded Drive Screw

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 Post subject:
PostPosted: Tue Mar 30, 2010 4:26 pm 
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Well, well. I got you again. I was looking for 'Fitter's screw'

This is a patented device for expanding a table frame - see below for a contemporary 1891 advertisement for the device.

Image

A this might be construed as an 'Over the pond' question I will refrain from keeping the very soggy point myself and donate it to charity :D

I'll give you an easier one next time...

Ralph :wink:

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 Post subject:
PostPosted: Tue Mar 30, 2010 5:49 pm 
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Obviously it's called....a patent double-screw that operates the frame of an expanding table.


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 Post subject:
PostPosted: Wed Mar 31, 2010 5:15 am 
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Yep! that's what I found.

http://johnmarkpower.blogspot.com/2009/ ... oseph.html

Good reading, history and a couple of pictures.

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PostPosted: Thu Apr 01, 2010 8:16 pm 
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I've not heard of a "double acting screw" I do know about "double helix screw". Would these be the same. ??????

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