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Rigging advice - 3/16/2008 3:16:29 PM   
Amadan


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Joined: 7/13/2007
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I've been working on an idea, but am finding myself stumbling against a few limitations, both in my knowledge base and in my supply lines, tho I thought I might throw out a question here and see what sticks to the wall, so to speak...

I'm trying to work out a straight pull (as opposed to something involving a lever, like a come along) lifting rig that will act as a force multiplier to allow an exertion of 30 pounds of force (or so) at a time to be applied to lift a trapeze bearing a rider from a single central pulley. I can put together a block & tackle style rig without too many problems (I've done rigging for stage professionally, and a bit on my own time for pleasure, natch), but I'm trying to determine the best way to make a doubled safety system to reduce the chance of accidentally shock loading the system back to the lifter, because the intent is to have the system hooked up to some potentially delicate body parts.

I was thinking using ratcheting pulleys in at least 2 positions in the block & tackle rig, but haven't worked with them in a bdsm context before and don't know much about them, and the only ones I've found with an idle eyeball search have a 150 pound weight limit, which is perilously close to the weight limit I'm aiming to be able to lift.
I'm reasonably sure that there has to be some good equipment along these lines in either nautical or rock/mountain climbing applications, but neither is a field I really have any experience with.

Any suggestions anyone?

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RE: Rigging advice - 3/16/2008 8:54:45 PM   
SirMIkeSD


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Joined: 3/16/2007
From: San Diego, Ca
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Take a look at the harkin ratching blocks at west marine or boatUS or anything other marine store.  I have them on my boat and they have served very well else where.

Mike


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RE: Rigging advice - 3/16/2008 9:44:54 PM   
DelilahDeb


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I know less than most about the specific tackle and equipment you speak of...
I do know that at a rope bondage group I attended in the past month, one of the suspension experts recommended using a safety factor of a power of 10 when planning rope strength. (For example, someone wanted to arrange a double suspension and figured 600 pounds was a reasonable breaking-strength for the rope being planned to use...and the expert recommended more like 4,000 - 5,000 pounds breaking factor!)

Delilah Deb

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RE: Rigging advice - 3/17/2008 3:19:40 AM   
Irishm57


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When i modified my bondage frame to do suspension, the first version i did was use a boat trailer type winch , which doubled back once through an industrial pulley(420 lb rating)  back to the winches base. On the other end of the that pulley were 2 more with a single line going to the suspension spreader bar. Not sure if it helps but the pullies were made by "National" , i found industrial ones were cheaper and had a higher weight limit than the marine ones. There was little to no "shock" in the lift when using the boat trailer winch in this configuration. When i changed it to a motorized winch the jerking motion went up 100 fold.
The Boat winch came from walmart and cost 19 bucks.  I noticed you are in the USA , so i thought i would mention they are cheaper there than at a boating store.

Not sure if this helps but here is a link to a pic of the set up i use. It shows the motorized winch, but that is where the boat trailer winch was. And the cable that doubles back to the winch to give a 2 to 1, was nylon rope when i had a boat winch there.
http://www.slavechris.com/Playroom/DCP_1127.JPG



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RE: Rigging advice - 3/17/2008 10:19:07 AM   
Guilty1974


Posts: 467
Joined: 11/2/2005
From: Den Haag
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quote:

ORIGINAL: DelilahDeb

I know less than most about the specific tackle and equipment you speak of...
I do know that at a rope bondage group I attended in the past month, one of the suspension experts recommended using a safety factor of a power of 10 when planning rope strength.


Most rope bondage riggers indeed recommend a 5 to 10 safety factor for rope and other materials used. But for rope bondage suspensions you do not need blocks, tackles, etc. You only need a hard point. Unless, of course, you really need to hang someone just below the ceiling.



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RE: Rigging advice - 3/17/2008 10:24:38 AM   
FRSguy


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Joined: 9/4/2007
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Look into sail boat rigging more specifically clutches. They can take a lot of weight and are a quick release design so you can have the line go through a stop where the rope can only be moved in a single direction (tightened) however if pull up on the rope it compleatly releases instantly.  This system will allow you add a seconday mounting point to your rig so when you raise the sub using a block and tackle system you then manually pull the seconday lines tight and lock them down on the clutch.  If the primary system gives way the secondary system will catch them so to speak. This is based on the seconday system not having a load on it unless the primary system fails.  The downside of it is that if the primary does fail you will have to deal with full body weight when lowering the sub.

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