Pros & cons greenmech blades

[Eddie Eco]

Yes why so many bearings? Ours has 1140 hours - no bearing change yet, no play either?

[dan494]

It's called a patent!

 

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All chippers use blades, can't see how you'd patent that

 

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[Ian C]

All chippers use blades, can't see how you'd patent that

 

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Best ask pete B. A lot of chippers use tracks but gm just won a case against jensen for the safetrac system.

 

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[dan494]

Maybe jensen will be suing forst in turn for some borrowed design ideas 😉

 

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[PeteB]

Tony Turner developed the disc blade and put a patent on it and each batch is made under copyright. Blades that appear from other sources are in breach of this and we monitor that situation. Copyright and Patent laws are very expensive to maintain and police and murderously expensive in trying to win a battle!

 

Each chipper manufacturer has its "USP", and one of ours is the disc blades. Some people love them and some don't, some people can understand them while others prefer the conventional blade. Choice is a personal privilege. For me, I chose to run GreenMech machines in my business in the early/mid 1990's, had a road tow and one on a Unimog and I didn't have any problems, and never had to buy any blades in five years of total usage! They chipped material up and blew it out the spout!

[PeteB]

All chippers use blades, can't see how you'd patent that

 

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That is a good observation, the patent relates to the fact that it is a blade, does the same as every other blade, yet when it looses its edge, it can be rotated to reveal another edge. Whereas, a flat edged blade has to be removed and resharpened once the edge goes off it.

 

If we put a full width flat blade in an AT200, it would have to be over 11" long to cover to opening. Each Disc blade is about 9" round so in effect, you have 18" cutting surface available to use per bank.

[PeteB]

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This is the video we did with the blade grinder. The finish they get is a little rough compared with those blades that get done in the factory but it is perfectly adequate to chip wood! We sell machines to all kinds of destinations and markets and some people buy blades, use the full rotation and then throw them, others prefer to resharpen them a few times with an appropriate supplier and some do them this way!

 

The grinder is available from your local GreenMech Dealer as a spare part and could be set up with a frame on the other stone to do flat blades too or maybe dress out chainsaw blades even?

[dan494]

What's the story with Saturn knives copies then? Do they have to pay a licence?

 

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[PeteB]

We have, in the past, sent them the solicitors letter advising them that they are in breach and advise people that we do not sanction the use of these blades. If anything was to go wrong and copy blades were at fault, all warranty would be void and no liability would be coming our way.

 

As said, Patent and Copyright is murderously expensive to enforce. Jensen copied the SafeTrac and many years later and many tens of thousands of pounds later we won and have got a "cease and desist", but we were able to prove that the design was ours which proved that we weren't lying or dishonest in the marketplace.

[Ty Korrigan]

Why so many bearings?

 

1. Burst grease pipe

2. Faulty bearing as far as we could tell

3. Grease pipe again.

4. Flywheel axle loose on bearing causing vibration.

5. Needs new flywheel and bearing as a result.

 

Ty