CMC CLUTCH BY HARKEN INDUSTRIAL

[Rg2034]

I am wondering if anyone had used the Clutch while they were working in a tree. I have used CMC MPD for the fire department, but not in tree work. I know it is similar to the petzl maestro and curious how it was and how did it handle with wood shavings.


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[Bart_]

Looks like a GriGri with teeth on the cam (?) In rough equivalence.

edit - I stand corrected. Looks like someone finally had the cajones to use a ratcheted gentle toothed pulley/sheave for life support. Work of art. Not quite like a grigri in rappel, more like a morgan block.

 

[Stumpsprouts]

It’s an amazing piece of hardware. A contract climber I know has one, I sent him the thread and hoping he will chime in. We used it to tension up a system for hanging lights. There’s a lot of uses I could see for it in tree care, and probably just as many ways to break it.

 

[southsoundtree]

I can't imagine using that.

Hitchhiker or Rope Wrench.

Proven, lightweight enough, compact, tree debris- compatible.

Different strokes, different folks.

 

[Stumpsprouts]

I can't imagine using that.

Hitchhiker or Rope Wrench.

Proven, lightweight enough, compact, tree debris- compatible.

Different strokes, different folks.

Not an ascension device. Tensioning, light rigging perhaps, mech advantage on pulls, probably a lot of things I don’t have the imagination to think of...

 

[Bart_]

I found some rope tech videos and apparently there's also a second unit by another company with a ratcheted sheave.

I'll chime in that wood shavings and precision mechanisms don't like each other. It would depend if they use simple mechanical clearance seals, labyrinth seals or polymer seals. I'd bet on the first option. Fine dust might eventually affect it.

The tech videos actually test the device in tensioning/hauling. There's a translation issue for me understanding the rope rescue train of thought comprehensively. I'll bet the textured grip sheave adds friction/drag because I know my Arbscender sheave adds friction gripping/ungripping the rope when I descend, even when under only the load of rope tail weight.