General > Practical Knots
what knot simulates zip tie behavior?
KnotMe:
So, two different friends (who really should know that I only tie decorative knots) have asked me: what loop knot can be tied then tightened by pulling on a free end which then remains tight?
Does there exist such a beast?
Crossposted to khww (it's a race! 8)
SS369:
Hi KnotMe,
the first one that comes to mind is the tautline hitch. I've used it in loop form to adjust tent guylines.
But there are many friction hitches that will do here as used in a loop.
Hope this helps.
SS
KnotMe:
Sounds plausible. It was not that secure in my satin cord, but then I don't imagine they'll be using such things to tie up their tents or whatever. ::)
Dan_Lehman:
--- Quote ---Does there exist such a beast?
--- End quote ---
More information re use is needed in order to well answer
this. There are various things that can give the illusion,
at least, to doing this. (That almost suggests decorative
tying, doesn't it?! ;) )
The versatackle mechanism might come closest to doing
the trick, as when hauling those structures tight, the parts
that will end up doing the binding (and which are wrongly
counted in figuring rough mechanical advantage) can go
pretty slack, out of the way; whereas most other possible
solutions are what I call "Paul Bunyan" structures --they
demand greater force in setting than they deliver (the force
needed to overcome the very friction that will secure them).
E.g., one could form a Prusik structure in the SPart and
run the tail back through this; setting tight would come by
pressing one hand against this knot and hauling the tail
through it, the increasing force ever building resistance
to the tightening. There are simpler such contraptions;
there might be some that "remain tight" in a sufficiently
long enough temporary state to allow one to tie off the
knot securely, which might meet some need (in contrast
to simply letting go and being done). Now, that was for
the "remaining tight" part; anyone want it later to be
untied? Hmmmm, ... !
So, your friends' exact needs ...
.
.
.
might just be to see if you can do any useful knotting.
(Or if whom you associate with are worth much!)
;D
postscript : I should remark about the Subject wording
--re "zip tie". I take this to be those ratcheting plastic
securing bands. In good ol' American buy-&-trash behavior,
these petroleum products are wasted more than they need
be : they usually can be undone, by inserting something
(sufficiently thin, narrow, & strong) to push the locking
tongue back so that the band can be slid undone.
Recently I found some in use at an arts festival for holding
signs that were large enough that one could effect the
release with a thumbnail! Great!
roo:
--- Quote from: KnotMe on June 24, 2012, 03:03:08 AM ---So, two different friends (who really should know that I only tie decorative knots) have asked me: what loop knot can be tied then tightened by pulling on a free end which then remains tight?
Does there exist such a beast?
Crossposted to khww (it's a race! 8)
--- End quote ---
It depends on how similar to a real zip tie it needs to act. I can give a few leads for you to mull over:
http://notableknotindex.webs.com/slippery8.html
http://notableknotindex.webs.com/Versatackle.html
http://notableknotindex.webs.com/blakeshitch.html
http://notableknotindex.webs.com/boaconstrictor.html
The footnote for the Slippery 8 Loop even discusses how it can be difficult to release if tensioned without an easy-release mechanism on the other end of the rope. Happy knotting.
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