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#1
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CMP seat back coil spring dimensions
Who can supply the basic dimensions of these coil springs? Overall length, diameter and wire gauge.
Also the size of the washers, please. I'm sure these, or ones very similiar, can be bought off the shelf somewhere? Thanks in advance, Hanno Quote from nos bag of cmp seat springs: Quote:
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Regards, Hanno -------------------------- |
#2
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Here are the measurements of the spring on my C8 1940 front seats.
Rings (9 per seat) Wire thickness 3mm Overall diameter 25mm Centre springs (18 per seat) wire thickness 1,5mm 40 coils Outside diameter 9,5mm about 85mm overall length including the hooks top and lower springs (6 per seat) wire thickness 1,5mm 48 coils Outside diameter 9,5mm about 94mm overall length including the hooks The top 3 springs and lower 3 springs are longer than the ones in the centre. Rings seem to be welded at the end....it's not solder as I heated one and nothing melted....except the skin of my finger My seats don't have the springs as shown in Peter's picture (with one long hook)....maybe a difference in supplier at the time?? or Ford vs Chev? early vs late? Alex
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Chevrolet C8 cab 11 FFW BSA Folding Bicycle |
#3
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Seat back springs
Hanno,
I never did find a source for new springs. I did acquire several rough seats and salvaged enough springs for my driver's seat, and a healthy reserve. Alex, Thanks for stepping in and correcting my post about the seat back springs. When I posted that picture, I was at the start of my learning curve. Your measurements and comments mirror what I have learnt. Peter 2017-08-16 16.12.39.jpg 2017-08-16 16.20.32.jpg |
#4
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Thanks Alex and Peter!
I will start searching.
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Regards, Hanno -------------------------- |
#5
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Been there ....found source for springs.
I am surprised Grant did not write on this topic....... just came back from a week of vacation and catching up with old emails.
We have found suppliers who will sell suitable size/tension springs by the yard but also got a bunch from a flea market already near size..... we used them with key rings which can be bought bulk. We have found that some seats have flat 3/4 washers with four little holes drilled for the springs.... no idead if they are Chev or Ford. will look up our information and post in a few days. Bob C
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Bob Carriere....B.T.B C15a Cab 11 Hammond, Ontario Canada |
#6
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The "by the yard" springs we found that were closest to the springs we were finding in seat frames for OD and wire size (and thus stiffness) were listed at McMaster-Carr, their product 9664K52 https://www.mcmaster.com/#catalog/123/1277/=193uptc
Oddly enough the springs were labeled as made in Australia so Australians may be able to more easily track down the source and not worry about McMaster's policy of not selling to those requesting international shipping or likely to take the parts out of the US. (so much for their argument about protecting US technology from intellectual theft). To re-bend the ends for attachment to the frames and rings/washers, hand tools were adequate. The original(?) springs we found in the frames had similar (the short style in the photo posted by Hanno) hooks on each end (differences due to age and abuse?). Last edited by Grant Bowker; 21-11-17 at 18:07. |
#7
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As follow-up----->. The flea-market find had the end flap of the box marked:
DURO DYNE Fire Damper Hardware FBBKP-39 Coil Spring Quantity 50 Duro Dyne of Canada Ltd. Montreal The spring was wound form 0.0495 or 0.050" wire (depends on where I measured) to make a 0.50" outside diameter coil, 2-7/8" between insides of the hooks, length of the coiled portion 2-5/32" Durodyne still exists, still has a location in Lachine (part of Montreal) http://www.durodyne.com/ A quick check didn't find the springs on their website but I'd be happy to be shown the link. |
#8
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Quote:
Although their site shows an eye on the spring I would be surprised if the long length springs actually have eyes. Unlike McMaster, Century will sell to Canadians (although I had the springs I bought shipped to the UPS store across the line). Century's instructions for forming eyes on the end of springs cut from long lengths are attached. Century's spring #576 is similar in length to some CMP seat springs I have. |
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