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| Re: [GMCnet] What's a slick shoulder /seat belt for a GMC [message #241684 is a reply to message #241658] |
Thu, 27 February 2014 17:25   |
1275gtsport
Messages: 272
Registered: September 2009
Location: Rothesay NB
Karma: 0
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Yep Mine are nice leather seats from a yukon or something all power and stuff. for me the shoulder belt is just for show. makes the LEO think all is well. I also don't see the need to reinforce the floor. If you are traveling fast enough that you rip the seat support out of the 3/4 plywood then you should have been in a race car anyway.
besides people have survived in these things for many many years with only lap belts.
Adam Raeburn
Rothesay, NB
1976 Austin Mini
1977 GMC Palm Beach
---------------------------------------------------
Once you replace everything that is attached to something else. It will all be fixed.
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| Re: [GMCnet] What's a slick shoulder /seat belt for a GMC [message #241723 is a reply to message #241658] |
Thu, 27 February 2014 22:17 |
zhagrieb
Messages: 676
Registered: August 2009
Location: Portland Oregon
Karma: 0
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Mine are from a Ford E-150 van. I took all hardware including the retaining nut for the shoulder bracket (which had to be torched out of the van). Belt length is just right using the original GMC mounting points for the ends and a fabricated bracket for the shoulder mounting nut. The bracket is "L" shaped and bent around the third former (hidden in the pix by the window trim). It is held against three formers with eight 1/8" stainless rivets and four 10/32 SS aircraft screws. If you're going through the windshield you'll need to take a lot of coach with you.
Here's a pix of the bracket.
http://www.gmcmhphotos.com/photos/uploads/4444/Moby_shoulder_belt_bracket.jpg
Glenn
Glenn Giere, Portland OR, K7GAG
'73 "Moby the Motorhome" 26'
[Updated on: Thu, 27 February 2014 22:28] Report message to a moderator |
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| Re: [GMCnet] What's a slick shoulder /seat belt for a GMC [message #241744 is a reply to message #241696] |
Fri, 28 February 2014 07:57 |
1275gtsport
Messages: 272
Registered: September 2009
Location: Rothesay NB
Karma: 0
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| USAussie wrote on Thu, 27 February 2014 21:20 |
Adam,
Don't know how your seats are mounted, however, if I am not mistaken the bolts for the OEM seat bases go through the aluminum floor
supports as well as the plywood.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
|
Hey Rob
I would have to go look because I simply bolted the new seat to the OEM bases that were there. So if the 1977 base mounted thru the floor supports then that is how it is now.
I am not saying this is the be all end all way to change the seats in the GMC. as I am not an engineer and have never met one. I do feel that what I have done to MY seat in MY gmc is safe enough for ME. If anybody wants to do the same thing to theirs then have at it. but don't blame me if the thing flies off thru the window when you run into something.
I personally would also not want a shoulder belt attached to the wall if it was never attached there before.
I Drive an Austin Mini and it has a shoulder belt. the 1969 version did not and the "B" pillar on it was NOT designed to take the forces of an impact.
Now if GMC had of continued to build these and had of then changed to a shoulder belt and the only thing they did was install a bracket to the existing frame (and not make said points stronger) then fine retro fit away. I would assume they would be required to do more crash testing thus having proof that the mount point is a good spot.
If not then ANY change from what was in the coach when built is just one persons opinion. As educated as they maybe. without testing your just guessing.
Adam Raeburn
Rothesay, NB
1976 Austin Mini
1977 GMC Palm Beach
---------------------------------------------------
Once you replace everything that is attached to something else. It will all be fixed.
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| Re: [GMCnet] What's a slick shoulder /seat belt for a GMC [message #241766 is a reply to message #241762] |
Fri, 28 February 2014 11:37 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Kelvin,
I tend to agree with you about the likelihood of losing the top half vs more
common accidents. But then I remember that there have been, during my GMC
ownership, at least 3 incidents where the top half went away. So, I won't
tie to that half and think everyone should have the chance to make an
informed decision.
Here's another of the incidents:
http://www.gmcmhphotos.com/photos/gmc-wrecks/p25811-lawhorn-wreck-in-fl.html
I have no details about this one except that where it occurred in FL it's
very unlikely to have rolled down an embankment.
Don't have any photos of the third one.
Be safe!
Ken H.
On Fri, Feb 28, 2014 at 11:45 AM, Kelvin Dietz <kelvin@datsuns.com> wrote:
> On 2/28/2014 7:01 AM, Bob Dunahugh wrote:
> > A close friend of mine that has a GMC Motor Home was in a very bad crash
> a year ago when some drunk pulled out onto the highway in front of him and
> his friend that was driving the 73 Chevy pickup that he was in. His friend
> that was driving was using the seat belt only. And was killed from internal
> injuries from the seat belt. As the passenger. He had the seat, and
> shoulder belts both in place. And had only minor injuries. I understand
> his desire to have a shoulder strap.
>
> This is the scenario that made me install three-point belts in my GMC.
> Much more likely to be hitting something hard and bouncing your face off
> the steering wheel than to be rolling the coach and miraculously survive
> while sitting in your intact seat. I'm playing the odds that my
> shoulder belts will be more useful and less homicidal in any future
> accident - which I intend to avoid in the first place.
>
> I had no intention of posting my pictures but Gene did it. And Ken was
> waiting with his "Miracle by the Highway"picture. That's his job when
> someone suggests shoulder belts. :-)
>
> Cheers!
> Kelvin
> '73 23' in Eugene, OR
>
>
>
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] What's a slick shoulder /seat belt for a GMC [message #241833 is a reply to message #241766] |
Fri, 28 February 2014 20:55 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Ken,
Agree re: "everyone should have the chance to make an informed decision."
This is one of the subjects that comes up repeatedly so I reckon we should put together a list OPINIONS regarding installing over
the shoulder seat belts in a GMC so when it does we can direct the person that brings it up to one place.
I suggest we brainstorm and list them; I'll start out
An over the shoulder belt would provide better restraint in case of a collision.
An over the shoulder belt if attached to the upper body could result in injury if the GMC rolls over and the body separates
An over the shoulder belt in the seat requires attachment to the floor taking the weight of the seat and occupant into consideration
Feel free to modify my opinions as you see fit.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: Ken Henderson
Kelvin,
I tend to agree with you about the likelihood of losing the top half vs more
common accidents. But then I remember that there have been, during my GMC
ownership, at least 3 incidents where the top half went away. So, I won't
tie to that half and think everyone should have the chance to make an
informed decision.
Here's another of the incidents:
http://www.gmcmhphotos.com/photos/gmc-wrecks/p25811-lawhorn-wreck-in-fl.html
I have no details about this one except that where it occurred in FL it's
very unlikely to have rolled down an embankment.
Don't have any photos of the third one.
Be safe!
Ken H.
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] What's a slick shoulder /seat belt for a GMC [message #241845 is a reply to message #241833] |
Sat, 01 March 2014 05:49 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Rob,
I'm not sure how you can give a balanced evaluation. The downside can only
be presented with the photos, yet there are no countervailing equivalents.
That makes me think perhaps the open active dialog is needed. But I'm not
hard over either way.
One suggestion for your statements so far: In the second one, eliminate
"the GMC rolls over and", or otherwise imply that rollover may not be the
only way to lose the structure -- in one incident the coach leaned against
a bank, ripping off a large section of the top half. Marty Laird, IIRC.
Another opinion:
The best option is the installation of seats with integrated shoulder
harnesses, using bases adequately reinforced and secured to the floor
substructure. Any swivels should receive especially careful attention.
Ken
On Fri, Feb 28, 2014 at 9:55 PM, Robert Mueller <robmueller@iinet.net.au>wrote:
> Ken,
>
> Agree re: "everyone should have the chance to make an informed decision."
>
> This is one of the subjects that comes up repeatedly so I reckon we should
> put together a list OPINIONS regarding installing over
> the shoulder seat belts in a GMC so when it does we can direct the person
> that brings it up to one place.
>
> I suggest we brainstorm and list them; I'll start out
>
> An over the shoulder belt would provide better restraint in case of a
> collision.
> An over the shoulder belt if attached to the upper body could result in
> injury if the GMC rolls over and the body separates
> An over the shoulder belt in the seat requires attachment to the floor
> taking the weight of the seat and occupant into consideration
>
> Feel free to modify my opinions as you see fit.
>
> Regards,
> Rob M.
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
>
>
> -----Original Message-----
> From: Ken Henderson
>
> Kelvin,
>
> I tend to agree with you about the likelihood of losing the top half vsmore
> common accidents. But then I remember that there have been, during my GMC
> ownership, at least 3 incidents where the top half went away. So, I won't
> tie to that half and think everyone should have the chance to make an
> informed decision.
>
> Here's another of the incidents:
>
>
> http://www.gmcmhphotos.com/photos/gmc-wrecks/p25811-lawhorn-wreck-in-fl.html
>
> I have no details about this one except that where it occurred in FL it's
> very unlikely to have rolled down an embankment.
>
> Don't have any photos of the third one.
>
> Be safe!
>
> Ken H.
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
_______________________________________________
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Unsubscribe or Change List Options:
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] What's a slick shoulder /seat belt for a GMC [message #241970 is a reply to message #241744] |
Sun, 02 March 2014 01:45 |
|
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Adam,
It appears from the tone of your reply you have taken offense at my comments. I merely meant to make you aware that the OEM seat
platforms were bolted through the aluminum floor supports and the OEM seat would have passed the testing required to prove that it
would not get ripped out of the floor in a head on crash and fly through the windshield. The OEM seatbelts are also bolted through
the aluminum floor supports.
After reading your reply I would also like to add that since you have advised that your new seats are mounted on OEM bases raises a
second question, if the bases in your GMC are a truncated pyramid with an offset swivel like this:
http://www.gmcmhphotos.com/photos/late-seat-bases/p27824-late-model-swivel-seat-bases.html
I wonder if they would survive the load created by an over the shoulder belt seat in a crash.
I agree that it's your coach and you can do with it what you like, and if you feel it's safe enough for you that is your business. I
agree if anyone follows your lead and the seat "flies off thru the window" they do so at their own responsibility.
I also agree that what I've noted are in fact guesses and under testing could turn out to be BS. However, if my guesses turn out to
be correct and the seat and test dummy wind up flying through the windshield because the seat was mounted to an OEM swivel base at
least they would have had the benefit of reading my guesses. :-)
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: 1275gtsport@gmail.com
Hey Rob
I would have to go look because I simply bolted the new seat to the OEM bases that were there. So if the 1977 base mounted thru the
floor supports then that is how it is now.
I am not saying this is the be all end all way to change the seats in the GMC. as I am not an engineer and have never met one. I do
feel that what I have done to MY seat in MY gmc is safe enough for ME. If anybody wants to do the same thing to theirs then have at
it. but don't blame me if the thing flies off thru the window when you run into something. I personally would also not want a
shoulder belt attached to the wall if it was never attached there before.
I Drive an Austin Mini and it has a shoulder belt. the 1969 version did not and the "B" pillar on it was NOT designed to take the
forces of an impact.
Now if GMC had of continued to build these and had of then changed to a shoulder belt and the only thing they did was install a
bracket to the existing frame (and not make said points stronger) then fine retro fit away. I would assume they would be required to
do more crash testing thus having proof that the mount point is a good spot.
If not then ANY change from what was in the coach when built is just one persons opinion. As educated as they maybe. without testing
your just guessing.
Adam
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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