surveyor
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Everything posted by surveyor
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Or how about a thimble built right in to the tether end of the rope wrench, that way the tether to the hitch climber could be fastened around the thimble, and a carabiner could be clipped through the thimble to pull the RW along as normal.
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Yes, the handled OAR is an 8" long by 1/2" carriage bolt, with about 4" sticking out both sides, with 4" by 1/2" PVC slip covers treaded on with a nut. I sent it out today for another rec climber to try out on his tachyon rope.
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Bing I took your advice and made the attach points from a larger link with a bored out hole, so that the biner will attach directly to the OAR. The ANSI size 80 roller links are some tough steel as my cobalt drill bit will hardly touch them, and a chain saw file just barely grates. Notice also that the master chain links have been treated with black oxide for corrosion resistance.
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Here is a video of the OAR being used with a 265 lb. weigh suspended on Imori line.
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Sirnick, with 250 lbs + gear it is likely you will need a fourth rack arm on the OAR. I have the OAR working with an even narrower rope (KM III), but it requires 4 rack arms. I plan on doing testing with your Imori and an inline scale to determine if it will release smoothly with your weight.
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Paul I would tend to agree, however it may have certain advantages, one being that the weight of the tail rope would not cause it to continue to descend.
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Do you have the wrap in place and then squeeze the handles together? If so, do you hold tension on the tail of the rope also? Gordon
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I found the patent which is dated Dec 2011, and while it is functionally very much the same as my Pulley Rack design, It has not been influenced by mine, because I did not show my design publically until March of 2012. Their patent does not explicitly state that it can be used SRT, but my design definatly can be. IMO the OAR I have shown is more versitle (midline) and has very minimal sitback. Time will tell. Petzl if you are watching, I have another idea kicking around concerning rope devices : )
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Experimenting I see, cheeky lad. : ) One of the nice features of the OAR is its almost instant grip when weighted. Does it release nicely with the smaller roller, no creeping? Do you have pics or video of your setup? The OAR works very well for me on Tachyon (This was the first arborist rope I had, Thanks Tom D.)
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The OAR is rope specific, and you can install different size rollers for different size ropes. I have tested it so far now on Imori and Rocket line with the larger rollers. Also I find that a DMM spacer from the small pinto pulley is perfect for use as a cam/roller for the bottom rack arm. As the rack arm swings up when weighted the sheave spacer functions as a rolling cam and clamps on the rope. When pulling down on the bottom arm, the roller/cam/sheave rolls back to release. As for the pin on the Dogbone, it is very stout, and the stops on the aluminum side plates give even more support. My goal was to keep it simple, compact, snag proof as possible, and light (5 oz. with tether).
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Here you go Paul. A short video of the setup.
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I will post pictures of it set up, as soon as my camera batteries are re-charged. : ) I have posted a picture of this Dogbone before, but it did not show how the rope was inserted. The purple one was from an earlier trial. Here they are pre-anodized
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Here is the Dogbone Rope Wrench that I use, notice how the swivel link allows the installation of the rope on line.
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Coming soon?
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I have a few out there given as gifts or favors, with very good feedback to date. Here is one user who tells me he loves his Dogbone RW. You can see it briefly in action about the 2:40 mark and then later towards the end of the video. [ame=http://www.youtube.com/watch?v=P0MfhNlEC18&feature=g-user-u]Maple Prune-Deadwood - YouTube[/ame]
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Do those who may be interested, I am now able to sell my Dogbone Rope Wrench design outside of the United States!
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Thanks Paul, for that report on your various ropes. How did you like the way it captures the rope once installed? How about its slack tending? I am surprised by the reported tightness on the Ivy as that is a very supple rope. If you require pulling two arms to descend, then try pulling and holding the first arm down, while then reaching up with a finger and gently pulling the middle arm downwards also, that should give you a smoother descent (use this technique on a doubled rope also). Gordon
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Paul see your private messages. I have not tested the OAR on 11mm line as of yet. Let me know what manufacture rope you climb on and, if I can obtain some to test with, I could try to make a custom OAR for that size and manufacture. I have no long term tests for wear as this is a new prototype device, however the high grade steel friction surfaces should last well.
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The rollers and link pins are all easily replaceable.
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You should see the way the brass reflects off the shiny chain link pins : )
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I am currently experimenting with both the full size OAR and the 3/4 size for use on smaller dia. rope. One of the unique features of the OAR is the ability to interchange roller sizes for use on different size ropes, and to add rack arms as required. It is my hope that it will descend on rope as small as 9mm, but that remains to be seen, as the smallest rope I currently have is a short piece of Poison Ivy and a short piece of Rocket line. I am testing now with the short piece of Rocket Line that was sent to me for a custom made OAR.
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3/4 size OAR
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Banks, check your messages. I have not been selling the Dogbone RW because I do not want to infringe on Kevins sales, and anyway the round end of the Dogbone does not work well with the hitch on ascent. This is a better design.
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No, if I was teasing, I would tell you I had a 3/4 size OAR in the works soon for smaller dia. rope, made of all steel and brass.
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The Dogbone rope wrench is my attempt to make a midline rope wrench with no parts to remove or drop, Kevin was interested and had this one in his possession, but it was all natural metal when he obtained it. When I asked if he could return it, he was kind enough to send it back with the anodization and logo that you see pictured. Thanks again Kevin.
