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Discussion in 'Search, Rescue and Technical Skills' started by Jeff Randall, Dec 11, 2019.

  1. Jeff Randall

    Jeff Randall ESEE Knives / Randall's Adventure & Training Staff Member

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    Rescue instructor Shawn Haynes sent me a box of bearings and a picture of Richard Delaney’s friction reducing micro-rollers wanting one built for evaluation during rope rescue training. Quick to build and turned out pretty nice. 8 ¾” overall length, 3 ½” wide and 2” high. Total weight is 1 pound 14 ounces. Sending it out today so he can put it to the test this weekend during some training to see if we need to modify anything.

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  2. RocketmanDane

    RocketmanDane Member

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    I would be concerned about the device flexing because of it using only 2 rods across.

    If you run into this problem and the device is designed to be only used on 1 side. I would consider placing at least 1 flush mounted rod in the center on the bottom edge for stability ( rods would form a V shape) or 2 flush mounted rods on the bottom almost below the other 2.
     
    Last edited: Dec 12, 2019
  3. Jeff Randall

    Jeff Randall ESEE Knives / Randall's Adventure & Training Staff Member

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    No issues with the way it is built. The design comes from one Delaney built and has used extensively doing 2-person load rescues in industrial settings, so you can throw this over a stairwell, elevator entrance, etc. and the haul ropes have almost no friction due to the edge.
     
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  4. RocketmanDane

    RocketmanDane Member

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    @Jeff Randall
    That’s a cool little gadget :)
    I worked on robotic arm designs a few years back that used a pivot pin design similarly to that and it was a problem we kept having... Imagine If you held both end pins in your hand and twisted opposite directions, that was the force we kept fighting with.
    JIK you run into a problem you have a possible solution :)
     
    Last edited: Dec 11, 2019
  5. Mudman

    Mudman Member

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    Looks sweet Jeff! Would a contraption like this, benefit at all from the addition of thrust bearings?
     
  6. Jeff Randall

    Jeff Randall ESEE Knives / Randall's Adventure & Training Staff Member

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    I don't think so. I actually thoughts about putting thrust bearings on the end of each axle, but after assembling it and getting everything tightened down, it really doesn't need them. There's a washer between the race and outside frame, as well as a washer between every bearing, so each bearing turns as an independent unit. Not to mention there's no real side to side weight on this once it's working.
     
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  7. Mudman

    Mudman Member

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    Ah that makes perfect sense, although I was curious.
     

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