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 Post subject: Vestibule trap latch springs
PostPosted: Wed Jul 03, 2019 1:03 pm 

Joined: Fri Jul 25, 2008 6:34 pm
Posts: 31
Location: Santa Maria, CA
Does anyone have a source for replacement springs for a vestibule trap latch? As the attached photo shows, one 'leg' of the torsion spring that keeps the latch engaged has rusted and broken off. (In the pic it's below the latch, visibly protruding ) I have tried Grainger, McMaster Carr, etc with no luck. I appreciate any help that you might offer.


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 Post subject: Re: Vestibule trap latch springs
PostPosted: Wed Jul 03, 2019 1:19 pm 

Joined: Thu Feb 27, 2014 10:08 am
Posts: 540
From the photo, it appears that the housing has two torsion springs, one on each side of the latch, that engage the housing and the latch. So, for my own education, how are these springs different from a standard-issue torsion spring? Also, it would seem that both should be replaced at the same time such that the spring force on either side of the latch is equal and to prevent having to open the housing up again when the other spring fails. Thanks.


Last edited by Scranton Yard on Wed Jul 03, 2019 1:42 pm, edited 1 time in total.

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 Post subject: Re: Vestibule trap latch springs
PostPosted: Wed Jul 03, 2019 1:30 pm 

Joined: Sat Sep 04, 2004 10:54 am
Posts: 1164
Location: Tucson, Arizona
You might have to have a specialty spring shop make that up for you.

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 Post subject: Re: Vestibule trap latch springs
PostPosted: Thu Jul 04, 2019 2:37 am 

Joined: Mon Aug 23, 2004 12:59 pm
Posts: 606
Try Century Spring

https://www.centuryspring.com/


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 Post subject: Re: Vestibule trap latch springs
PostPosted: Sat Jul 06, 2019 7:35 pm 

Joined: Sat Sep 04, 2004 10:54 am
Posts: 1164
Location: Tucson, Arizona
They look like regular torsion springs. And yes, both springs should be replaced at the same time.

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"When a man runs on railroads over half of his lifetime he is fit for nothing else-and at times he don't know that."- Conductor Nimrod Bell, 1896


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 Post subject: Re: Vestibule trap latch springs
PostPosted: Sat Jul 06, 2019 8:29 pm 

Joined: Fri Aug 20, 2010 8:25 pm
Posts: 374
One detail that may be obvious, but could be overlooked.

From the Photo it looks like those springs are "mirror images" of each other.

Looks like the "fixed" leg (the spring part that does not move when the shaft rotates) is towards the outside of the main body casting (fixed portion).

That means that there maybe a "left" and a "right" spring which are symmetric about the center of the latch.

It might be a little hard to tell with one of them broken into pieces.

Seems from the photo that you might need two different springs (a left and a right), double check before ordering any custom parts. Might be safest to send them both springs (and/or the remaining pieces of each).

Or it might just be two copies of the same spring, hard to tell from one photo ?

Good Luck, Kevin.


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 Post subject: Re: Vestibule trap latch springs
PostPosted: Sun Jul 07, 2019 12:04 am 

Joined: Mon Aug 23, 2004 12:59 pm
Posts: 606
I had to rebuild a trap latch (different type) a few years ago.

I got stock torsion springs from McMaster-Carr.

I had to buy a package of right-hand-wound springs and a package of left-hand-wound springs of the same dimension in order to do the job. That is not a problem, McMaster requires that you specify the direction of winding for each spring purchase.


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