Quick Release fire extinguisher mount - Page 5 - Defender Source
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  #81  
Old November 30th, 2012, 08:21 PM
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Charles Joerss
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What about on the roll cage right behind the front seats?
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  #82  
Old November 30th, 2012, 11:20 PM
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Cohbra,

I'm in for two.
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  #83  
Old December 1st, 2012, 12:07 AM
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  #84  
Old December 1st, 2012, 07:12 AM
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Charles Galpin
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Quote:
Originally Posted by Hinckley423 View Post
What about on the roll cage right behind the front seats?
It's a popular spot but you do need suitable mounts. Search the forums for collars and you should find threads showing what I use
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  #85  
Old December 1st, 2012, 07:35 AM
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I'm specifically interested in this for mounting on the roll cage bars behind the front passenger seat.
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  #86  
Old December 1st, 2012, 08:33 AM
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John Lindsay
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Just adding re the mounting place... I've got mine mounted to the front of the seat box in front of the passenger....

My kids find it a real handy step.....
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  #87  
Old December 1st, 2012, 08:34 AM
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Quote:
Originally Posted by Hinckley423 View Post
What about on the roll cage right behind the front seats?
When I get back home I'm going to do some testing on my prototype to determine exactly how much force would be required for the extinguisher to be removed from the clamp. I will need to do it again on the production version once I have them in hand, but the prototype should give us a good idea of how secure it would be. I have had a lot of interest from the racing community on another forum as well, and they have requested that I do whatever I can to make sure that it will pass tech inspection at the race track, so that is my goal.

Just so you know, the standard that I'm shooting for is that the clamp must be able to retain the extinguisher under a 20G acceleration. If I can achieve this, I'm sure it would be fine to mount it anywhere you would like to put it.
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  #88  
Old December 1st, 2012, 02:38 PM
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  #89  
Old December 2nd, 2012, 04:17 PM
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Quote:
Originally Posted by Cohbra11 View Post
When I get back home I'm going to do some testing on my prototype to determine exactly how much force would be required for the extinguisher to be removed from the clamp. I will need to do it again on the production version once I have them in hand, but the prototype should give us a good idea of how secure it would be. I have had a lot of interest from the racing community on another forum as well, and they have requested that I do whatever I can to make sure that it will pass tech inspection at the race track, so that is my goal.

Just so you know, the standard that I'm shooting for is that the clamp must be able to retain the extinguisher under a 20G acceleration. If I can achieve this, I'm sure it would be fine to mount it anywhere you would like to put it.
20G Acceleration? that is ( or close to ) the impact of an Air-Bag Deployment in your chest unbelted, or the impact of you ( unbelted ) hitting a wall at 25 mph ( no hands on the steering )

If you are doing that , you will be able to mount that sucker upside down and use it as a grab bar *LOL*
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  #90  
Old December 2nd, 2012, 05:15 PM
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I'm curious to know how you are performing this 20G test.
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  #91  
Old December 2nd, 2012, 05:19 PM
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Originally Posted by rrc.swb View Post
I'm curious to know how you are performing this 20G test.
You should be the guinea pig as I described above *LMAO*
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  #92  
Old December 2nd, 2012, 05:39 PM
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I've still got some reading up to do so that I can make sure I do it properly, but I think it is just a calculation involving the mass of the extinguisher and the 20G acceleration so that you can determine the effective force exerted on impact. Then simply apply the calculated forced to the extinguisher and see if it comes out of the clamp, or destroys it. The specifications doesn't give a whole lot of detail though. I'm still a little uncertain on whether that applies to all axis, or just the axis relative to the direction of the vehicles travel. I'd be willing to bet that it applies to all axis, and I'm pretty sure it would not pass the test in that case.
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  #93  
Old December 2nd, 2012, 09:37 PM
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It turns out that its a very simple calculation, Fi=WG, where Fi=force of impact, W=weight of object, and G=G-force. Therefore ~3.5lbs (for a full 2.5lb extinguisher) X 20G = ~70lbs of force. I can tell you right now that if it takes 70lbs of force to remove the extinguisher, you're not going to be very happy with me if you're ride is on fire and you're trying to overcome the 70 lbs required to remove the extinguisher. However, I do think I can satisfy that requirement in 2 out of the 3 axis. Anyway, it's all speculation at this point. I'll get some hard data for you guys if I can ever make it home.
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  #94  
Old December 5th, 2012, 05:19 PM
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Bump for more interest
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  #95  
Old December 7th, 2012, 09:50 PM
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I'll finally be headed home tomorrow after being stuck in Moab, UT for 5 straight weeks. I'll be meeting with a few foundries around Denver next week to discuss the project. If all goes well, I'll have a quote or two by the end of next week on the sand casting. None of the companies I emailed last week ever responded back.
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  #96  
Old December 9th, 2012, 01:55 AM
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Cohbra....count me in for 2
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  #97  
Old December 9th, 2012, 09:08 AM
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Cobrah it will be interesting to hear what the foundry says regarding casting vs fabricating vs machining the pieces... Depending on the # you require they may steer you in a different direction. If you were going to make lots and lots you might get a custom extrusion and then chop off the parts you need. I'd love to see some pics of the actual device. . . At least keep us in the manufacturing loop!

~Steve
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  #98  
Old December 12th, 2012, 01:02 PM
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I finally made it home this week so I'm going to try to meet with some of the local foundries on Thursday/Friday. Stay tuned for more updates here soon.

Revtor, I did get a quote back on having the clamp halves made on a CNC and the cost was astronomical. $95 for each half of a clamp, and that was having 100 of them made! Needless to say, I won't be going that route.


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  #99  
Old December 13th, 2012, 07:25 PM
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I spoke with a local foundry today and it's looking pretty promising. I would expect that I'll have a solid quote tomorrow afternoon and we can officially get this ball rolling!
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  #100  
Old December 17th, 2012, 02:20 PM
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Previously I had stated that this was going to be for an extinguisher with a 3" OD but I am strongly considering making it for a 3.25" OD extinguisher now instead of the 3". It looks like the major brands such as H3R and Kidde use a 3.25" OD for their 2.5lb extinguishers. I would appreciate opinions on this and whether or not it would affect your decision to buy.
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