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Old 07-28-2018, 05:46 AM
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Door Restrainer Mechanism Model T Coupe

Recently I was inspired by a homemade door strap restrainer mechanism that will retract when the door is closed.

The mechanism I saw was built into a 1926/27 Model T coupe cowl A pillar.
I have posted a picture of it below.

At first I was a little disappointed that my project was much more advanced and painted, so I thought maybe it was too late to consider such an inclusion.

In the meantime I was pondering my options as the restrainer strap I am using is a rubber repro type that does not come with much of a reputation so I am told now that others have seem mine installed.

In fact my rubber restrainer strap had already perished and degraded just by sitting in position before I have completed assembly of my project.

I have decided to try and manufacture a bolt in style unit comprising all the features and principles of the picture but in a manner that I can make it on the bench and just bolt it in with a minimum of fuss.

So here I go...
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Old 07-28-2018, 06:13 AM
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I have stared and stared at that pic and can't see how its supposed to work, can you explain it?
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Old 07-28-2018, 06:47 AM
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Looks like a spring loaded slider that retains tension on the strap.
The strap loops over the slider and back through the jam attaching to the door. As the door opens the strap pulls the slider towards the door, the spring pulls it back keeping the slack out of the belt.
Clever, should work well.
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Old 07-28-2018, 07:25 AM
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Thanks, 36. I finally figured it out. It is slick and simple. I am not sure how well chicks will dig the way it works but it would keep a guy from hurting his car on a windy day!
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Old 07-28-2018, 09:16 AM
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I see how it works. Pretty simple but, I hate rattles so I would be looking to make it rattle free.


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Old 07-28-2018, 09:44 AM
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I sure hope it don't rattle.
I am heading into the wilderness with this mechanism.
I plan to use a similar seat belt style strap.
The beauty of the idea is that when the door is closed all the strap is retracted back under the trim panel and leaves no bunched up strap which looks odd, plus very annoying for RHD cars because that is usually where the drivers foot sits on the gas pedal and in some cars you just want to have as much clear foot space as you can find.
It is a slick idea, not my idea, but I do intent to replicate it mostly as you see it.
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Old 07-28-2018, 10:22 AM
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The local fabric supplier may have some heavy webbing that would work for that. I may steal that idea for my build..

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Old 07-28-2018, 12:28 PM
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Quote:
Originally Posted by fiftyv8 View Post
I sure hope it don't rattle.
Some nylon scrub points and nylon washers at the slide joint would stop any rattles
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Old 07-28-2018, 05:21 PM
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Because mine is something I am considering late in my build, I have chosen to use a piece of RHS tube as my base component.
For simplicity as we are working more and more with metric measurements and this tube is a metric size, I have chosen the size 65mm x 35mm.

Where I am it is not a common size and I have had to settle for a wall thickness of 2.5mm which is way to thick really, but since it is a prototype I am going to run with it for now.
This RHS tube will need to be cut trimmed and shaved according to what gets in my way during the fitting process.
You never know it could also end up in the scrap bin if it ain't going to work for me...

I chose the 65mm dimension as it offers me the option of being able to run seat belt strapping upto 2" or 52mm, which seems to be the most common and easily found.
The strap must be flexible enough to run smooth and not get caught up at the slide pin point where it must double up when the door is closed.
So the 65mm dimension allows me to run the 52mm strap plus still provides enough space inside the tube for the small saddle gizmo to fit that is attached to the spring.
I have found that I have some approx 3mm or 1/8" stainless steel wire that I can use to make them.

With respect to the 35mmm dimension, I chose this because it was slender and looked to be close to being capable of being installed into the cowl panel area without too many issues.

The next concern was a choice of pin/bolt size that should work.
I chose 1/4" diameter because it is about the same size material used in the original door retainer saddles, it is a common and easily sourced size, plus I had some here.
The trick I see is that where the seat belt material is going to run over, you do not want any thread on the shaft.
I fortunately had some long bolts with only thread at the ends which will work out OK I hope.

For those contemplating using this door strap method, the spring seems to be the most important consideration.
I have no idea much about springs, so I am flying blind in this department.
I have determined that the strap will travel a maximum of about 8" from the closed position to the fully open position.
I have also worked out that by doubling over the seat belt strap as shown in the original build that I am copying, that my spring will need to be able to extend in tension about 4".
The type of spring required is a tension spring with hooks at both ends, my guess at this point is that it will be approx 9/16" diameter or 15mm and the wire material diameter should be approx 1.0 to 1.2mm.
I think 1.2mm equates to approx 1/16".

Now don't quote me on these sizes because we are flying blind here, but I did find an old spring that I played with and this is what influenced my conclusions so far.

I previously installed a piece of angle with tapped holes to accept the lower door hinge bolts which also doubled up as my original attachment point for the previous retainer strap that failed dismally.
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Old 07-28-2018, 09:03 PM
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Here is a pic of my first attempt at making the spring saddle.
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Old 07-30-2018, 11:26 PM
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Well, I got the body of the bolt in portion of my mechanism put together.
Its snug but it looks like it will work OK as far as the installing goes.
I also cut the upper and lower slots for the moving pin to slide in.

I've determined that I will use two bolt points.
First bolt point will be in the angle iron bracket that already exists at the lower door hinge and the second will be installed at the seam where the firewall and cowl side panel join, giving me metal of substantial thickness to use and I will not disturb anything else.
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Old 08-01-2018, 11:52 PM
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Well, I got a little more done on the first mechanism.
Obviously if this works out I will be fabricating a 2nd for the other door.

Here is the unit with the tail welded on which will reach forward to the lap point of the firewall and cowl panel seam connection.

I plan to drill a hole thru the seam at the firewall edge and into the tail and put one discrete bolt there and the other up front at the A pillar.
The tail on this side needed some surgery to clear a electrical wire conduit install earlier before I had thought about this mechanism.
I don't expect the opposite side mechanism will require some much fitting and tailoring...

I've also sorted out my slide bolt using a big washer up top to help provide a little extra stability to the bolt as it slides.
I also placed a dab of weld under the washer so that the bolt will not rotate since I need the washer to remain and not rotate as it will also bind against my sound deadening attached to my cowl panel.
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Old 08-02-2018, 05:05 AM
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If I have not previously mentioned it, the seat belt strap I plan to use will run thru the hollow of the RHS tube I am using.
I'm sure most folks have worked that out.
I think I have found a length of useable seat belt strap that is just long enough to do both sides, what a bonus...
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Old 08-04-2018, 09:45 PM
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I scored a seat belt strap that looks to be suitable to work and be long enough to do both sides.

I've done a mock up and it seems to work OK.

I have however decided to acquire some nylon washers to install on the slide pin top and bottom which I feel will encourage a better slide motion during use.

I'm still waiting to receive my springs in the mail as well as my nylon washers, so things may die here for a while until they arrive.

In the meantime here are a couple of pic's of my mock up for now...
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Last edited by fiftyv8; 08-04-2018 at 09:56 PM.
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Old 08-04-2018, 09:52 PM
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More pic's, it seems every once in a while I get a TOKEN issue message that prevents me from posting a reply or adding pic's.

Here we go for the rest of the pic's.

Thanks for your patience.
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