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SWING-MOTION TRUCKS

June 30, 2010 07:40AM
This only my speculation, but I think what you have there are known as “swing motion” trucks. The indication is the fact that the elliptical leaf springs are set somewhat to the inside so their centers are inward from the centers of the side frames.

The truck bolster is attached to the tops of each leaf spring by a connecting casting of some kind. The bottom of each leaf spring is attached to the spring plank with a similar casting.

However, the spring plank does not mount solid in each truck side frame. Instead, the spring plank is suspended by spring plank swing hangers that are attached to the solid cross members that connect to the side frames and are positioned on each side of the truck bolster.

The spring plank swing hangers are mounted with a hinge pin that allows them to swing in arcs crosswise to the truck. This allows the spring plank to move side to side. Because of the arc of the swing hangers, when they allow the spring plank to swing to either side, the spring plank lifts slightly. So when the force that is acting to cause the swing dissipates, the hangers naturally settle back into their centered position.

If you look at the photo of the EBT truck, you can see the tops of the spring plank swing hangers on each of the solid cross piece timbers, on each side of the bolster. So, there are four of these swing hangers. They also require special castings to attach them to the bottom of the spring plank. And those attachment castings must have a pivoting connection with a pin so they have a hinged attachment to the bottom of the spring plank just like their attachment to the solid cross members at the top.

So you need four swing hangers, four pivotal swing hanger mounting castings at the upper end of the hangers, and four pivotal swing hanger mounting castings at the lower end of the hangers.

And you also need a mounting casting at the top of each leaf spring that attches it to the bolster, and another mounting casting at the bottom of each leaf spring that attaches it to the floating spring plank. Perhaps these top and bottom spring mounting castings can be identical.
Subject Author Posted

Jackson & Sharpe trucks question

Rich Murray June 29, 2010 02:02PM

Re: Jackson & Sharpe trucks question

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Re: Jackson & Sharpe trucks question

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Re: Jackson & Sharpe trucks question

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Re: Jackson & Sharpe trucks question

Rich Murray June 30, 2010 04:21AM

Re: Jackson & Sharpe trucks question

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Re: Jackson & Sharpe trucks question

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Re: Jackson & Sharpe trucks question

bonefish June 30, 2010 05:12AM

Re: Jackson & Sharpe trucks question

Rich Murray June 30, 2010 05:52AM

Re: Jackson & Sharpe trucks question

Bill Dennehy June 30, 2010 06:00AM

SWING-MOTION TRUCKS

Ron Keagle June 30, 2010 07:40AM

Re: SWING-MOTION TRUCKS

BillD June 30, 2010 08:15AM

Re: SWING-MOTION TRUCKS

William Adams June 30, 2010 09:37AM

Re: SWING-MOTION TRUCKS

Rich Murray June 30, 2010 09:44AM

Re: SWING-MOTION TRUCKS

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Re: SWING-MOTION TRUCKS

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Re: SWING-MOTION TRUCKS (1 detailed & 2 simple dwgs.) Attachments

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Re: SWING-MOTION TRUCKS (1 pic & 2 crude dwgs.)

Rich Murray July 01, 2010 08:35AM

Jackson & Sharp - No "e"

hank June 30, 2010 11:36AM

Re: Jackson & Sharp - No "e"

Rich Murray June 30, 2010 12:25PM

Re: Jackson & Sharpe trucks question Attachments

Paul Dalleska June 30, 2010 01:20PM

Re:Fantastic!

Rich Murray June 30, 2010 01:28PM

Re: Jackson & Sharpe trucks question Attachments

Paul Dalleska June 30, 2010 01:29PM

Re: Jackson & Sharpe trucks question

Rich Murray June 30, 2010 01:32PM

Re: Jackson & Sharp "smiley" question ... eye popping smiley

Russo Loco June 30, 2010 01:59PM

Paul, I'm sorry

Rich Murray June 30, 2010 02:05PM

Re: Rich, I'm NOT sorry ... grinning smiley

Russo Loco June 30, 2010 02:40PM

Re: Rich, I'm NOT sorry ... grinning smiley

Rich Murray July 01, 2010 08:16AM

Re: Adult Ed for Seniors Only

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Re: Adult Ed for Seniors Only

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Re: Jackson & Sharpe trucks question Attachments

ROW Explorer June 30, 2010 07:44PM

Re: Jackson & Sharpe trucks question

Fritz Klinke July 01, 2010 02:28AM

Swing-Motion Details

Ron Keagle July 01, 2010 05:33AM

Re: Swing-Motion Details

Russo Loco July 01, 2010 06:06AM

Re: Swing-Motion Details

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Re: Jackson & Sharpe trucks question

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Re: Jackson & Sharpe trucks question

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Re: Jackson & Sharpe trucks question

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Re: Jackson & Sharpe trucks question

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Re: Jackson & Sharpe trucks question

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Re: Jackson & Sharpe trucks question Attachments

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Re: Jackson & Sharpe trucks question

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Re: Jackson & Sharpe trucks question

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Re: Jackson & Sharpe trucks question

gbrewer July 21, 2010 11:41AM

Re: Jackson & Sharpe trucks question

Rich Murray July 21, 2010 11:46AM

Re: Jackson & Sharpe trucks question

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Re: Jackson & Sharpe trucks question Attachments

Rich Murray July 22, 2010 04:39PM

Swing Motion Thoughts and Observations

Ron Keagle July 22, 2010 05:42PM

Aha! He probably means something like this: Attachments

mikerowe July 21, 2010 05:56PM

Re: Aha! He probably means something like this:

Samart July 22, 2010 06:32AM

Re: Aha! He probably means something like this:

Rich Murray July 22, 2010 07:59AM

Re: Aha! He probably means something like this:

mikerowe July 22, 2010 09:45AM

Re: Aha! He probably means something like this:

mikerowe July 22, 2010 09:44AM

Re: Jackson & Sharpe trucks question

Rich Murray July 23, 2010 02:57AM

Re: Jackson & Sharpe trucks question

Rich Murray July 23, 2010 03:02AM

Re: Jackson & Sharpe trucks question

gbrewer July 23, 2010 06:52AM

Re: Jackson & Sharpe trucks question

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Re: Jackson & Sharpe trucks question

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Re: Jackson & Sharpe trucks question

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