quick release rope joining? 3

[subsearobot]

Hey there. I am looking for a piece of hardware that functions like a seatbelt buckle. It must, however, function with cordage instead of webbing. hopefully it will be cylindrical in shape. It must be "somewhat" sturdy and light weight - rated to ~200#.

I need to join two cords (1/8" spectra) under a tension. what this means is that the latch must engage without much relaxation in the line. The cords are fixed length, as is the spanned distance. I tried to use caribeaner- type joiner, but once the reciever settled onto the loop, the line was slack. or it woudl be too difficult to join in the first place.

something like this:

http://www.amazon.com/gp/product/B0...ue&ref_=ox_sc_sfl_title_2&smid=A2VPI5RFYNE0AS

but intended for load holding would be sweet.

any ideas?

 

[ornerynorsk]

Ball and groove coupler modified to crimp or glue cord in place. Just a thought.

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

 

[RolMec]

Perhaps you look for sthg the like of a bike lock, where the latch catches the groove within the body of the lock under spring tension and is released by turning the key.

 

[zeusfaber]

Spectra - a bit like steel wire rope - doesn't really stretch, so I appreciate your problem.

If you can relax on the "cylindrical" bit of the requirement, you might find that a snap shackle does the trick.

A.

 

[LittleInch]

If you're able to incorporate some sort of flexible element or spring rated at your load then you have lots of choices,

Otherwise its something like this.

http://www.lankhorstropes.com/offsh...mooringropes/LANKOFIRSTDEEPWATERROPECONNECTOR

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[MintJulep]

Ropes join nicely with knots.

Use a Taught Line Hitch.

https://en.wikipedia.org/wiki/Rolling_hitch

 

[dvd]

I'm thinking about wrapping the end of the rope with something akin to that on the end of a shoelace and plugging it into a Legris coupling. Or cement cord into a short section of tubing and plug into same fitting. Strictly unwarranted.

 

[GregLocock]

What proportion of the UTS of the cord do you wish to maintain?

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

http://eng-tips.com/market.cfm?

 

[chicopee]

MintJulep, knots in ropes reduce strength of rope by 50% as a rule of thumb.

 

[cowski]

...something akin to that on the end of a shoelace...

aglet

 

[monkeydog]

Quick Release, or will something like a turnbuckle work?

 

[MintJulep]

1/8" Spectra is good for 1,600 pounds. OP needs 120 pounds.

 

[77JQX]

Have you considered a garda hitch?

 

[hendersdc]

You could use something like these quick release hooks from Mcmaster, there should be minimal loosening of the wire after mating because of the location of the pivot.

 

[zeusfaber]

So that's two votes for the snap shackle so far.

A.

 

[SnTMan]

Will some kind of cleat work? Maybe with a single line?

Regards,

Mike


The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[THT]

One simple cheap solution is just nut and bolt, if the release doesn't need to be instant. Attach the cords just slack enough to get a few easy turns for a hold, then turn the rest of the way to tighten the cords.

For example these with suitable holes ready:
Eye Nut Hanger
Machine Bolt Hanger

But yeah, not quick release...

 

[Sparweb]

Many of the swivels at this page are similar to the general idea is similar to the snap-catch swivel that the OP started with:

http://www.mcmaster.com/#wire-rope-swivels/=107n5fz

Some are too heavy, some are too light... Maybe with a little more searching a more suitable fastener can be found.
Replace the clevis/cotter pin with a quick-release pin like these:

http://www.mcmaster.com/#standard-quick-release-pins/=107n8aa

STF

 

[subsearobot]

some great answers here! thanks all!
A bit more info for the curious:
it is part of a consumer based portable folding structure, so needs to be made/unmade easily and repeatably. It may be good if the user can modify the final tension, so I really like the cleat idea. But the snap shackles are exactly what I was trying to avoid designing myself before I decided to look at the concentric cylinder avenue! I've never seen them before in reality.

thanks all!

 

[IFRs]

Perhaps looking at window shade pull hardware?