Author Topic: Constrictor type knot around large flat objects?  (Read 1445 times)

l2oBiN

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Constrictor type knot around large flat objects?
« on: April 12, 2019, 12:49:10 PM »
I am probably using the wrong knot, but I was wondering whether there is a solid binding knot for large flat objects like books? I tried the constrictor but the cordage just does not seem to friction/tie down...

roo

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Re: Constrictor type knot around large flat objects?
« Reply #1 on: April 12, 2019, 03:19:57 PM »
I am probably using the wrong knot, but I was wondering whether there is a solid binding knot for large flat objects like books? I tried the constrictor but the cordage just does not seem to friction/tie down...
If you are set on using a Constrictor-type knot, you may have more luck if you put the crossings over a convex region (if it exists), perhaps near the book's binding.  Those crossings need a slight change of direction to engage.

Otherwise you can try a Versatackle:

https://notableknotindex.webs.com/Versatackle.html

Or use multiple wraps, holding as much tension as you can, finished with a binder-type knot like a Reef Knot or Surgeon's Knot:

https://notableknotindex.webs.com/reefknot.html

« Last Edit: April 12, 2019, 05:07:44 PM by roo »
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Dan_Lehman

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Re: Constrictor type knot around large flat objects?
« Reply #2 on: April 16, 2019, 01:06:23 AM »
... whether there is a solid binding knot for large flat objects like books?
Yes, there are variations on a theme we might
call "Dahm's Floating Binders".  Andrew? Dahm
introduced the Gleipnir binder to this forum a few
years ago, and it became a big hit.  I found some
like structures.

Here's a quick verbal presentation, which I've used
with the now ubiquitous cable-pulling webbing (a
soft, highly flexible, solid polyester lubricated tape
in sizes from 400# (!) - 900 - 1000 - 1130 -1250 -1850
- & 2,500 # strengths, varying mostly by width.

This structure I'm about to describe will put TWO
strands of material around its bound dimension.

Simply envisioned, it's a shopping-tag hitch (aka
"larkshead", "girth hitch"),
with its ends run around the bound dimension,
back up to pass through the hitch --which
might've been preformed on your finger, e.g.--
in opposite directions.
Pulling on these inserted ends,
perpendicularly to the bound dimension,
draws the larkshead towards the hauled-on ends' side
and thus ever more tightens the hitch,
which grips these hauled-on ends.
(Still, when done, it might be advisable to further
knot the ends, into a handle to carry the bound
books, perhaps.)

You can search this site for the original,
and I think the above variation.

(The original can be seen as a simple version
of the clove hitch in which the crossing part
makes a full turn over-around the two ends,
like a bowline's nipping loop holds the tail's
tucks through it.)

Effectiveness depends on circumstances of materials
and so on; but these can be effective structures!
One can increase the number of nipping turns,
or the binding wraps.

Cheers,
--dl*
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Andreas

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Re: Constrictor type knot around large flat objects?
« Reply #3 on: May 06, 2019, 07:24:49 AM »
Please post a photo Dan... or the link to one I couldn't follow the description.

Groundline

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Re: Constrictor type knot around large flat objects?
« Reply #4 on: May 06, 2019, 03:49:47 PM »
    I found this post in a General search for "Gleipnir Binding"  from X1: Jan 08, 2013. It shows two photos of the bight clinching the running ends that come in from opposite directions.
   The line drawing at the bottom looks incorrect as the bight is not twisted but only a crossing.

MkT

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Re: Constrictor type knot around large flat objects?
« Reply #5 on: June 24, 2019, 05:24:15 PM »
Please see my photos that follow.  I transferred these from my post in a different thread dealing with a question about Carrick loops because it seems more relevant here. Might try this constrictor-based variation for your use. With all of my added twists , it gripped the slick plastic surface of the rectangular TI-84 calculator case (shown) pretty well without the need to place the ?cross-cross? part of the constrictor at the calculator?s convex edge.  No guarantees though.

MkT

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Re: Constrictor type knot around large flat objects?
« Reply #6 on: June 24, 2019, 05:42:10 PM »
photos

jmlucassen

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Re: Constrictor type knot around large flat objects?
« Reply #7 on: June 25, 2019, 12:06:03 AM »
There was a binding knot (described on this forum I think, but I can't find it now) that involves making two turns with the string around the object, bringing the two free ends somehwat past each other; then grabbing the turn in the middle, pinching it and twisting it 270 degrees (or perhaps 450 degrees) to create a loop, and passing the two free ends through the loop in opposite directions.  The knot is tightened by pulling the ends in opposite directions.
The interesting thing about this knot is that if it is used to bind together a bundle of items, and some items are removed from the bundle, the knot can be tightened simply by pulling the ends in opposite directions again.