Shackle

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Check the ANSI Z133.1-2006 standard under 5.7.9.

A screw pin shackle on top of the ball, with a ring & ring on the pin and the pin secured with a steel "ANSI Z" rated, for life support, krab going through the pin hole, capturing the ring & ring, preventing the pin from unthreading, is what The Care of Trees uses in IL, VA, MD, PA, NY, CT and CA. I've also put on a presentation for the WAA (Wisconsin Arb. Assoc.) showing this technique. There are picks earlier in this thread.

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1. I've never seen this technique, is it actually what the ANSI standard is?

2. What about a couple of steel locking carabiners on the load line above a ball like this where there is no other place for a strap or cambium saver?


3. I've never done this, but does anyone use a haven style grip on the load line above the ball for a tie in?

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1. This technique was actually approved by an OHSA inspector from IL. As long as the steel krab is through the pin eye and the ring & ring is captured in the steel rated krab, preventing the pin from unthreading, it's OK to use.

2. I'd have to see a picture of this to give comments. It would depend on how the krabs are orientated and loaded.

3. A Havens grip can cut through wire strands when excessively loaded and is not "positively" gripping the wire rope. I don't think it would be acceptable.
 
I have always used Norm's method for attaching on the line above the ball. I've used shackles provided by other crane companies, but then I purchased one and prefer to have my own gear for that application. It is very simple, but also flawless and easy to monitor. I keep a triple or quad action carabiner with the gate facing outward to capture the friction saver. There is nothing hidden or unduly loaded with this method. And the bend radius is nice for the rope.

Thanks, Norm for having shared this technique with us!
 
Hey can one of you guys throw up a picture of what you are talking about. I remember seeing it once but can't remember exactly. Thanks.
 
Instead of using that big honking shackle why not use a short length of chain? it could be choked around the cable and secured using a small shackle or screwlink. Make it long enough so that the false crotch end for the climber's rope is down below the ball. A pulley could be slung using a screwlink or biner. There would be fewer pieces and it would use off the shelf parts. Cheaper and lighter too!
 
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Instead of using that big honking shackle why not use a short length of chain? it could be choked around the cable and secured using a small shackle or screwlink. Make it long enough so that the false crotch end for the climber's rope is down below the ball. A pulley could be slung using a screwlink or biner. There would be fewer pieces and it would use off the shelf parts. Cheaper and lighter too!

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Tom, why not present that to OHSA? They're the one's that have to approve it.
 
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Tom, why not present that to OHSA? They're the one's that have to approve it.

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I don't have a dog in the race. There is a better chance of me skiing to the North Pole than working off the ball of a chain
grin.gif


The days of me using a crane for treework have likely passed. If the University needs work done that requires this setup they would have me contract a company to do the work.

Let's just say...if this didn't need any sort of approval, would you use it? Is there anything wrong with the idea?

I see a webbing FC that hangs near the ball. A burr on any piece of the iron could degrade the webbing. Using proof chain seems to solve this.
 
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Instead of using that big honking shackle why not use a short length of chain? it could be choked around the cable and secured using a small shackle or screwlink. Make it long enough so that the false crotch end for the climber's rope is down below the ball. A pulley could be slung using a screwlink or biner. There would be fewer pieces and it would use off the shelf parts. Cheaper and lighter too!

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Do you mean attatch the chain back to itself abobe the ball and let a single part of chain hang ovr the side. Then attatch FS or pulley or what ever.

Or do you mean make like an endless loop with the chain that is smaller than the ball that would sit similar to the shackle?
 
Here is a good pic from classictruckman

250079-220731-Tieinpoint.jpg



The only thing I'm not sure about here is the aluminum Am'D because of:

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and the pin secured with a steel "ANSI Z" rated, for life support, krab going through the pin hole, capturing the ring & ring, preventing the pin from unthreading,

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I'm pretty sure when I use this setup I'll pass the friction saver through some cobra anti-abrasion hose.
 

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I understood the minimum rating on the shackle should be 9.5 ton

I have a 4.75 ton I bought for this purpose but haven't used yet. Unless my math is off this converts to 47.3 kN ?

Shouldn't that be adequate?
 
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Instead of using that big honking shackle why not use a short length of chain? it could be choked around the cable and secured using a small shackle or screwlink. Make it long enough so that the false crotch end for the climber's rope is down below the ball. A pulley could be slung using a screwlink or biner. There would be fewer pieces and it would use off the shelf parts. Cheaper and lighter too!

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Do you mean attatch the chain back to itself abobe the ball and let a single part of chain hang ovr the side. Then attatch FS or pulley or what ever.

Or do you mean make like an endless loop with the chain that is smaller than the ball that would sit similar to the shackle?

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Make sure that the chain is Grade 8 minimum everything less is make for road equipment.
 
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Here is a good pic from classictruckman

250079-220731-Tieinpoint.jpg



The only thing I'm not sure about here is the aluminum Am'D because of:

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and the pin secured with a steel "ANSI Z" rated, for life support, krab going through the pin hole, capturing the ring & ring, preventing the pin from unthreading,

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I'm pretty sure when I use this setup I'll pass the friction saver through some cobra anti-abrasion hose.

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The nice thing about the larger shackle is it fits over the becket an lays on top of the downhaul weight instead of rubbing on the loadline like in the picture,even though it appears to be on the dead end.
 
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The only thing I'm not sure about here is the aluminum Am'D because of:

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and the pin secured with a steel "ANSI Z" rated, for life support, krab going through the pin hole, capturing the ring & ring, preventing the pin from unthreading,

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I'm pretty sure when I use this setup I'll pass the friction saver through some cobra anti-abrasion hose.

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You're right robinia, I hadn't seen that Steel reqirement before, maybe I didn't look close enough, I'll be ordering a new steel one in the morning.

I don't see any need for the anti-abrasion hose(not that its a bad idea), there aren't any sharp edges near the FS.
 
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The nice thing about the larger shackle is it fits over the becket an lays on top of the downhaul weight instead of rubbing on the loadline like in the picture,even though it appears to be on the dead end.

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usually I move it just a little lower so the horseshoe end is between the wire rope clamp and the becket.
 
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Do you mean attach the chain back to itself above the ball and let a single part of chain hang over the side. Then attach FS or pulley or what ever.



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This one.
 
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Hey can one of you guys throw up a picture of what you are talking about. I remember seeing it once but can't remember exactly. Thanks.

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I like this one the best.
17 ton shackle
2 foot ring & ring
Petzl Kador 40kN(steel double auto locking krab)
 

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I don't mean to be a pest but are there any thoughts on this one?

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I understood the minimum rating on the shackle should be 9.5 ton

I have a 4.75 ton I bought for this purpose but haven't used yet. Unless my math is off this converts to 47.3 kN ?

Shouldn't that be adequate?

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I think that one would be adequate, I like it when the shackle stays above the becket, the biggest concern that the Ministry of Labour has here in Ontario is that most crane operators hammer in the pin that connects the ball to the becket, they are worried that years of hammering will crack the eye in the becket and possibly drop the ball.
 
Norm showed me his set up many years ago. It has been a perfect fit on every crane job since. Why renvent the wheel (plus it has been approved). If the weight of the shackle is a problem all I can say is Man Up!
 
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