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| Trap door springs https://www.rypn.org/forums/viewtopic.php?f=1&t=32061 |
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| Author: | Jim King [ Wed Sep 14, 2011 11:00 am ] |
| Post subject: | Trap door springs |
I should have stated that we need trap door SPRINGS, not hinges. I've been so focused on getting the doors put together that I forgot about the latest development where the lead guy fabbed hinges from steel tubing and milled steel brackets. The true need is some sort of spring, probably a torsion spring that slides over the tubing spacer between the hinges. Any help/suggestions/sources would be appreciated. Jim King CML |
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| Author: | Dave [ Wed Sep 14, 2011 11:21 am ] |
| Post subject: | Re: Trap door springs |
You'll probably find something in McMaster that will work - but you may have to alter the new hinges to accomodate it. Better to finalize the design before fabricating. dave |
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| Author: | J.David [ Wed Sep 14, 2011 4:35 pm ] |
| Post subject: | Re: Trap door springs |
Greetings: Valley Railroad uses cut up sections of McMaster-Carr 2594K13 "flat rod drain cleaners" with success (Scott Whitney at the Green Mountain told me about this material for a replacement spring). We make custom "hinge pins" to fit. J.David |
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| Author: | filmteknik [ Wed Sep 14, 2011 8:32 pm ] |
| Post subject: | Re: Trap door springs |
Perhaps you can edit or delete the prior post. Steve |
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| Author: | Aarne H. Frobom [ Thu Sep 15, 2011 9:05 am ] |
| Post subject: | Re: Trap door springs |
On some pre-war CN lightweight coaches, we replaced the corroded rubber-faced trap doors with new ones formed from steel step tread, a bit heavier than the originals and much more durable. The coil springs were junk on these traps, but we had new ones made up at a local spring shop. I can't remember how we specified the springs to the shop, but we must have told them how much load they were expected to lift in torsion, and the adjustment available in the hinge design let us fine-tune it to make the trap spring up just right. It was pretty cheap, too. Aarne Frobom Bear Trap Springs, Michigan |
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