Glad you like it Grover!
I think I've covered most of the aspects why TreeFlex was developed in other threads. Take a look in the training and health section for arborist ergonomics. And the other TreeFlex thread in Rant and Rave.
To help answer your question, TreeFlex is designed differently to any other harness; the fit is to the fused bones of the pelvis rather than the waist. Here are some points I copied from another post of mine:
After analising likely MSD issues with Dee 3 years ago, we looked at ways in which arborists could greatly reduce their risk of MSDs, with the least amount of change. These were the priorities:
No.1 was arborist awareness
No.2 was the harness, to hold the body as best possible in a practicable way.
No.3 was the use of powerful legs and buttocks in ascent (their natural function) rather than hands, arms, shoulders and back.
No.4 was correct alignment of all component parts of the Muscular-skeletal system during ascent.
No.5 was efficient work positioning, posture, stance, use of spurs and chainsaws in the tree.
The list goes on.
A suitable harness could not be found that was suitable for improving all the above points. The TreeFlex addresses all of the above, not least No.1, which is why we are discussing this!
The TreeFlex is the only harness on the market, that meets all of the following requirements:
1. A sit harness designed to fit the human system in the most ergonomically efficient way.
2. Independant leg loops.
3. A front sliding bridge.
4. A waist attachment point designed to take a chest ascender.
5. A rear loop designed to hold a simple chest sling to hold the chest ascender (For The 'Frog' system of ascent, which is widely recognised as the most versatile and effective SRT ascent system).
6. A modular design to enable replacement of worn parts.
7. An effective adjustment system to gain the correct seated position for any size of climber.
8. A back pad that works at supporting the climber properly, whether sitting or standing on spurs.
9. A design than prevents the harness waist belt from riding up into the ribs.
10. A design that maintains a low centre of gravity with the sliding bridge.
11. Ergonmically designed gear loops that do not require too much twisting of the back and wrist to clip or unclip gear.
12. A centre back attachment point for easy clipping of the chainsaw, to ensure the weight is centrally loaded.
13. Karabiner slots for easy racking of gear/clipping the chainsaw high, including one at centre back.
14. active lining that stimulates blood circulation to the skin avoiding soreness, with high breathability for hot weather.
15. Strategically placed padding to seat the harness correctly and avoid discomfort.
A suitable harness that met these 15 points was a tall order, and unfortunately I couldn't find one. Which meant we had to design one and find someone to patent and manufacture it. It will also be available in three sizes.
Paolo.
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CAVEAT: This post is the opinion of the author, without prejudice...So help me God.
Edited by Lazarus2 (07/20/06 03:22 AM)