Both bends are not symmetric - the first ( second picture ) does not work ( it "opens up" very easily, when the Standing Ends are not crossed, as now ), but the second does, even in this form.
However, with a little tinkering, they can be transformed and made symmetric, and then both work fine.
They do not have a n y relation with the Gleipnir. If we need to find something to which they "resemble" structurally, we can say that they are Fisherman-like "sliding" bends, where the two halves do not slide on their Standings Ends, but on the toggle which runs parallel to them.