Walking axle skateboard

[boreality]

Whenever the brush/log cart has been discussed I've thought they needed a walking axle for an almost mechanical advantage over rough terrain. Check out this guy's skateboard "invention" smoothing out stairs. I've built a couple for lighter loads out of mountain bike rear ends welded together and I could approach a 3' fallen log and lift one wheel at a time over it with a 400lb load feeling like nothing as all the weight is transfered to the lower wheel and you have leverage over the axle.

http://www.youtube.com/watch?v=ukW6cQ-TddI

 

[RopeShield]

Good stuff.
I think another solution is to ski/surf it. Flip it for real dude!
That surely wins it with speed and frictionless though.
Chuck Norris approved.Bro!

 

[boreality]

How about the angled trampoline at the base of the tree to bounce the blocks to the truck. Why waste gravity?

 

[SumoClimber]

here's an atv trailer with the floating tandem axle. http://www.northerntool.com/shop/tools/product_200311375_200311375

I've also see them from time to time at the local Fleet Farm. Can't vouch for capability yet, but once I'm needing a cart for behind the atv (soon-ish, projects in the works), I'll probably pick one up to test out.

 

[boreality]

That's the application where I saw the design. A welder from a small logging town near here claims to have came up with the idea for atv trailers and we used them for tree planting. They work great.
There may of been a lunar lander or a Mars robot with the design so I can't say it's not rocket science, pretty simple idea though. I bet some Roman chariot builder thought he had a cool idea too.

 

[grappleyarder]

Lots of examples in the woods of trailers with walking beam suspension. Heavy haulers (150t) with unsuspended axles always had tire trouble, walking beam float same old tires just kept a going.

Nice little vid for those who like a day in the woods...

http://www.youtube.com/watch?v=gxWUz1Qc51g&feature=g-vrec

 

[jim454]

[ QUOTE ]
Lots of examples in the woods of trailers with walking beam suspension. Heavy haulers (150t) with unsuspended axles always had tire trouble, walking beam float same old tires just kept a going.

Nice little vid for those who like a day in the woods...

http://www.youtube.com/watch?v=gxWUz1Qc51g&feature=g-vrec

[/ QUOTE ]

That looked like fun.