E250 Vertical Seat Adjustment?
Fleet Owner
Joined: Aug 2010
Posts: 21,255
Likes: 1,657
From: Reynoldsburg, Ohio
Just some friendly advice for you tinkering with seat mounting.
Because a seat PROPERLY mounted is vital to occupant safety using materials NOT suited for the purposes shown here so far you're jeopardizing the crash worthiness (such as it is) in the front seats. Keep in mind tubing or pipe nipples used along with the wrong grade fastener are not strong enough.
Its easy to wish Ford would have built vehicles to fit our bodies perfectly but they didn't. Some modification to the front seat belt restraint system can be done with only a minor reduction in occupant safety but the word PROPERLY figures highly into that big "if". What we've seen so far is NOT something I'd want to stake my safety on. Not being a bit facetious but that "add a cushion" idea is the best suggestion so far.
Because a seat PROPERLY mounted is vital to occupant safety using materials NOT suited for the purposes shown here so far you're jeopardizing the crash worthiness (such as it is) in the front seats. Keep in mind tubing or pipe nipples used along with the wrong grade fastener are not strong enough.
Its easy to wish Ford would have built vehicles to fit our bodies perfectly but they didn't. Some modification to the front seat belt restraint system can be done with only a minor reduction in occupant safety but the word PROPERLY figures highly into that big "if". What we've seen so far is NOT something I'd want to stake my safety on. Not being a bit facetious but that "add a cushion" idea is the best suggestion so far.
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Mountain Pass
Joined: Dec 2020
Posts: 170
Likes: 45
Just some friendly advice for you tinkering with seat mounting.
Because a seat PROPERLY mounted is vital to occupant safety using materials NOT suited for the purposes shown here so far you're jeopardizing the crash worthiness (such as it is) in the front seats. Keep in mind tubing or pipe nipples used along with the wrong grade fastener are not strong enough.
Its easy to wish Ford would have built vehicles to fit our bodies perfectly but they didn't. Some modification to the front seat belt restraint system can be done with only a minor reduction in occupant safety but the word PROPERLY figures highly into that big "if". What we've seen so far is NOT something I'd want to stake my safety on. Not being a bit facetious but that "add a cushion" idea is the best suggestion so far.
Because a seat PROPERLY mounted is vital to occupant safety using materials NOT suited for the purposes shown here so far you're jeopardizing the crash worthiness (such as it is) in the front seats. Keep in mind tubing or pipe nipples used along with the wrong grade fastener are not strong enough.
Its easy to wish Ford would have built vehicles to fit our bodies perfectly but they didn't. Some modification to the front seat belt restraint system can be done with only a minor reduction in occupant safety but the word PROPERLY figures highly into that big "if". What we've seen so far is NOT something I'd want to stake my safety on. Not being a bit facetious but that "add a cushion" idea is the best suggestion so far.
In this case, the idea would be to raise the seat itself, not the seat base. I believe (need to check this) that the safety belts are anchored to the base, so that whole assembly is left untouched.
Senior User
Joined: Dec 2020
Posts: 182
Likes: 27
From: Lake Camanche, CA
So noted; however,the tensile strength of a grade8 3/8' bolt is 150,000 pounds per square inch. Square tube tensile strength of at least 42,000 psi, yield strength of at least 35,000 psi and ultimate shear strength of 27,000 psi. Therefore that modification would be the least of my worries if involved in an accident.
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Mountain Pass
Joined: Dec 2020
Posts: 170
Likes: 45
My concern would not be with it holding, but with insurance coverage. After an accident, if they found the seat mount altered, I can just see the insurance companies using that as an excuse to wiggle out of paying. On the other hand, people remove and install non-OEM seats in their vehicles all the time, so I don't know if this problem ever actually comes up.
Elder User
Joined: Feb 2015
Posts: 699
Likes: 5
From: S. Illinois
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Mountain Pass
Joined: Dec 2020
Posts: 170
Likes: 45
What size (diameter) pipe do you use?
Mountain Pass
Joined: Nov 2016
Posts: 162
Likes: 5
From: Bremen, Germany
One could use a quick and dirty paper based calculation or FEA software for these adapters.
Basically all you need to do is to check if the required forces and momentums from the FMVSS207 see https://www.law.cornell.edu/cfr/text/49/571.207
routed through the specific parts you use create tensions (bending and twisting) are lower than the permissible strength (or yield ) of the hardware.
I am a mechanical engineer and might be able to create a quick analysis next week.
Basically all you need to do is to check if the required forces and momentums from the FMVSS207 see https://www.law.cornell.edu/cfr/text/49/571.207
routed through the specific parts you use create tensions (bending and twisting) are lower than the permissible strength (or yield ) of the hardware.
I am a mechanical engineer and might be able to create a quick analysis next week.
Thread Starter
|
Mountain Pass
Joined: Dec 2020
Posts: 170
Likes: 45
One could use a quick and dirty paper based calculation or FEA software for these adapters.
Basically all you need to do is to check if the required forces and momentums from the FMVSS207 see https://www.law.cornell.edu/cfr/text/49/571.207
routed through the specific parts you use create tensions (bending and twisting) are lower than the permissible strength (or yield ) of the hardware.
I am a mechanical engineer and might be able to create a quick analysis next week.
Basically all you need to do is to check if the required forces and momentums from the FMVSS207 see https://www.law.cornell.edu/cfr/text/49/571.207
routed through the specific parts you use create tensions (bending and twisting) are lower than the permissible strength (or yield ) of the hardware.
I am a mechanical engineer and might be able to create a quick analysis next week.
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Lead Driver
Joined: May 2004
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From: Maryville
Just some friendly advice for you tinkering with seat mounting.
Because a seat PROPERLY mounted is vital to occupant safety using materials NOT suited for the purposes shown here so far you're jeopardizing the crash worthiness (such as it is) in the front seats. Keep in mind tubing or pipe nipples used along with the wrong grade fastener are not strong enough.
Its easy to wish Ford would have built vehicles to fit our bodies perfectly but they didn't. Some modification to the front seat belt restraint system can be done with only a minor reduction in occupant safety but the word PROPERLY figures highly into that big "if". What we've seen so far is NOT something I'd want to stake my safety on. Not being a bit facetious but that "add a cushion" idea is the best suggestion so far.
Because a seat PROPERLY mounted is vital to occupant safety using materials NOT suited for the purposes shown here so far you're jeopardizing the crash worthiness (such as it is) in the front seats. Keep in mind tubing or pipe nipples used along with the wrong grade fastener are not strong enough.
Its easy to wish Ford would have built vehicles to fit our bodies perfectly but they didn't. Some modification to the front seat belt restraint system can be done with only a minor reduction in occupant safety but the word PROPERLY figures highly into that big "if". What we've seen so far is NOT something I'd want to stake my safety on. Not being a bit facetious but that "add a cushion" idea is the best suggestion so far.
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