Where to buy? (Shackle for crane tie-in)

[John Paul Sanborn]

He bought one from United Rental that supposedly was OSHA approved.

There is a big difference between OSHA and ANSI approval. If I understand it right this is one of the areas where Gerstenberger and associates is still haggling with the OSHA. If you are going to use these methods, know the standards you are going by to the letter. My recollection of the Z133 there is no prescribed method of attachment of climber positioning systems; other then not interfering with the crane's functionality.

To answer the question in the OP I got mine from American Arborist. It was under 100 bucks but not by much if I recall.
I tell you from experinence you don't want to be on that hook. I mean you can ( but not really) but you have to really be careful. I was on a hook years ago, the operator was swinging it into the canopy, I was hollering for him to stop but he didn't. The clasp was opened by the little twigs and my rope popped out just as I got onto a limb but still did not have my lanyard on the tree. It could have been nasty.In fact I am still pissed off about the whole thing.

Don't know if it has been tested to this effect but if the disengaging device does not work or if the crane does not have one it seems to me that the clevis, if fed up into the sheave by an unalert op would likely break when under pressure.

People been riding the hook for decades. If the sub op says I have to use the clevis (on rare occasion) I will but if it is not there....no biggie. I ride my own without one. Been doing it for, again, decades...and I am still here.

Lots of these rules are being made by white skinned, soft handed, office type, wannabe's that haven't got a clue. (kinda like Jomoco )

 

[John Paul Sanborn]

Another caveat with the clevis use - the pin should go against the cable and the climber on the clevis it's self.

A moment for the nomenclature;

A clevis is a type of shackle that is U-shaped and holed for a pin to pass through, not all shackles are clevis. I just feel a need for common nomenclature with critical components.

The conversation dredged this up from my military days. In Helo Op's they use this clevis with a bushing on the pin (the only place I've seen the pin called an apex). This is from an Army FM on rigging helo's (HEE-lows)

FWIW the Navy calls it mousing when you put the safety wire in the end of a threaded/nutted pin.

 

[treemandan]

This seems to work real nice. It comes as a complete unit so no trying to fit square pegs in round holes and takes the guesswork out.

 

[treemandan]

Sigh. See I was feeling good abvout you having chipper envy and then you had to go and post this. You know we can't ride the hook over here right? So just stop all this cool talk about crane picks before I break down and

I am only posting an example of what can happen. Now in most cases I don't see a problem with riding the hook. A lot of times people are working under what is on the crane ( steel, trees, roof trusses, etc) so one must trust that the thing is not going to break and this devise still does not negate the fact that it still may.
I think the reason why you are supposed to ride the hook is for the example I posted, otherwise; Why not?
It just so happens that the crane operator wasn't paying attention. After I landed and got secure he kept swinging the boom around and managed to break a limb out over my head. The limb didn't fall but stayed attached by a thin strip of bark which I had to go get before anything else. People ask me why I have so many beeners and I tell them " do something stupid below me and you will find out".
You think you want to cry? Well on the way to the job I was sitting next to some new kid who kept telling me stories of people getting ####ed up doing trees.

 

[lego1970]

There is a big difference between OSHA and ANSI approval. If I understand it right this is one of the areas where Gerstenberger and associates is still haggling with the OSHA. If you are going to use these methods, know the standards you are going by to the letter. My recollection of the Z133 there is no prescribed method of attachment of climber positioning systems; other then not interfering with the crane's functionality.

Yea, I'll be honest I don't know much about the rules, but thanks for the response. When and if I ever fly by a crane again I'll look into it more.

 

[oldirty]

here you go boys. (if someone wants to put this pic up so it comes up in a post go ahead)

 

[Hoister]

I see ..Old Dirty ..we call it a "D" ring..or a lifting ring ..Master link works to now that Im up to speed ..

Nothing wrong with that.....

However ..replace the shackle ..looks like theres a notch worn on the saddle ..Use that one to get you out of the mud ..

 

[Hoister]

Don't know if it has been tested to this effect but if the disengaging device does not work or if the crane does not have one it seems to me that the clevis, if fed up into the sheave by an unalert op would likely break when under pressure.
People been riding the hook for decades. If the sub op says I have to use the clevis (on rare occasion) I will but if it is not there....no biggie. I ride my own without one. Been doing it for, again, decades...and I am still here.

Lots of these rules are being made by white skinned, soft handed, office type, wannabe's that haven't got a clue. (kinda like Jomoco )

Treevet ...what you describe is known as "2-blocking" every crane new or old must have a "A2B" or "Anti-2-blocking" alarm ..This will do one or 3 of the following and is required to be operational 100% of the time

1 - it well signal a audible alarm loud enough for the operator the hear
2- it will produce a flashing light with the audible alarm
3 - it will disengage the winch up/scope out /or boom down function of the crane ..all the while Either producing an audible alarm / flashing light or both

This is generally what that weight looks like

To test the system ..all a guy has to do is lift up on the weight ,, and ask the operator to hoist up ..on newer units he shouldn't be able to with out putting the crane in rigging mode or over-riding the system.. on an older unit a light should flash and an audible signal heard in the operator's station ..

By the letter of the law ..if its not there or not working .the crane shouldn't be put into service ..


In your last statement ..Yeah ..anybody who's been at it for a spell knows this is true ..

 

[BigUglySquirrel]

clevis, shackle, u-bolt

Hey all.

In this neck of the woods, the rigging industry calls this piece a clevis or shackle. Clevis is most popular. They come in different ratings so BE CAREFUL. Industrial rigging use capacity @ 3/4" pin (or apex) is 6.5 TONS. (13,000 lbs. for those playing along at home)

Now, for tree work--namely riding the ball of a crane-- we have the hook which is pinned to the headache ball which is pinned to the beckett that terminates the cable. When using the beckett, the tail is redirected back toward the upper sheave assembly at the tip of the boom of the crane. (ya dig so far?)

Ok.. from there, we take 2 cable clamps and clamp the dead end (tail) to the standing end, leaving a slight gap between the two segments. (Just a reminder, when working with cable, it's good rigging practice to "never saddle a dead horse." In other words, the "dead" end (tail) should be captured on the U-bolt side of the cable clamp assembly. Also, it's important to pay attention to the torque specifications that accompany your cable clamps. Thirdly, make CERTAIN that you are using the appropriate sized cable clamp for your cable.)

Now we place a 3/4" clevis in between the cables and tighten the apex into the body using a 12" adjustable wrench. It's also important to note that the APEX goes between the cables so that your Tie-in-point is the BODY of the clevis. NO. We don't use the "pinned" variety because they aren't rated as strong and there's no need for it. Tightening the axis with a wrench will hold it in place with no issue. If you're still concerned with it, use low-grade locktite.

From there we tie into the body of the clevis with your preferred hitch. It's nice because you can ride without bonking your melon on the headache ball or having to worry about your line getting tangled with the rigging sling/cable when you attach the load to the hook. It's also waaay better than tying into the hook because you can get up closer to the hook when attaching your rigging sling/cable.

If there's any questions I'll try to draw something up or elaborate. BTW--the only reason we use a clevis that large is because it's a sure-fire bet that your line won't get tangled on retrieval and you can feed a clevis or ropesnap through it pretty easily. Remember, tie-in points are part of a life support system so they MUST be rated at a minimum of 5,000 lbs. PER CLIMBER ATTACHED. As a sidenote....Friction savers are pretty redundant in this case because the clevis is a smooth steel surface. Friction savers just get in the way and add length. If you need additional length, just let out some line on your climbing line. You can always take it back in if you need to. Just my two cents there.

Hope this helps!

Chris

 

[BigUglySquirrel]

oops... meant to mention that I have clevises if you're in need. Just email me @ [email protected]

Chris

 

[treemandan]

I see ..Old Dirty ..we call it a "D" ring..or a lifting ring ..Master link works to now that Im up to speed ..

Nothing wrong with that.....

However ..replace the shackle ..looks like theres a notch worn on the saddle ..Use that one to get you out of the mud ..

I don't think there is anything wear that would negate the safety of that set up. I don't like the fact that the climbing line contacts the crane hardware though.

 

[BigUglySquirrel]

I don't think there is anything wear that would negate the safety of that set up. I don't like the fact that the climbing line contacts the crane hardware though.

personally not a fan of the ring interfering with the swivel actions of the headache ball. just MO tho..looks plenty beefy.

 

[treemandan]

personally not a fan of the ring interfering with the swivel actions of the headache ball. just MO tho..looks plenty beefy.

That is what I was referring to as well. But it looks like its working.

 

[oldirty]

i can take that shackle and throw it around the "beckett" like it was a spinwheel. no interference at all.

and when you hang your weight on it the climb line does not touch the ball at all. i moved the shackle for the pic so you would be able to read the WLL. which is 8.5ton i think. and that masterlink is good for 10ton as well....i think. lol.


anyway she a lovely set up with no spin or rope rub'n interference. highly recommend it. mr treevet, sir. all my previous crane climbing was off da hook too before i joined where i am now. it'd be mighty white of ya to make this switch. painless even!

stay safe boys!

 

[treemandan]

i can take that shackle and throw it around the "beckett" like it was a spinwheel. no interference at all.

and when you hang your weight on it the climb line does not touch the ball at all. i moved the shackle for the pic so you would be able to read the WLL. which is 8.5ton i think. and that masterlink is good for 10ton as well....i think. lol.


anyway she a lovely set up with no spin or rope rub'n interference. highly recommend it. mr treevet, sir. all my previous crane climbing was off da hook too before i joined where i am now. it'd be mighty white of ya to make this switch. painless even!

stay safe boys!

did you say " don't fear the becket" ?

 

[Hoister]

I don't think there is anything wear that would negate the safety of that set up. I don't like the fact that the climbing line contacts the crane hardware though.

I can see noticeable wear on that saddle ..If an Inspector saw it ..it would get replaced before work resumed ....And thats pretty much how they play ...

Ive thrown shackles out for less ..

 

[treevet]

Looks like both of those cotter pins are subject to some abrasion as well. If either one fails remember don't worry about the fall.....it is the landing that may be of concern...:biggrinbounce2:

 

[oldirty]

Looks like both of those cotter pins are subject to some abrasion as well. If either one fails remember don't worry about the fall.....it is the landing that may be of concern...:biggrinbounce2:

lol.

go look at that other thread i started. see some crane action.