From: Douglas B Rupp (rupp@gnat.com)
Date: Fri Aug 19 2005 - 22:50:06 PDT
Bolts are threaded into steel anchor and bear on steel anchor, so no jacking
possible. The only thing the bolts appear to do is prevent the aluminum
thing from twisting.
Forklift loaded it on a dump truck and I dumped it out at my place, then
used a medium sized excavator to roll, push, pull it into place.
-----Original Message-----
From: MV [mailto:MV@dc9.tzo.com]
Sent: Friday, August 19, 2005 10:23 PM
To: Douglas B Rupp
Cc: Military Vehicles Mailing List
Subject: Re: [MV] How do you unscrew an Army anchor?
OK,
I'll take a wing at this. If the bolts go through the aluminum and are
threaded in the aluminum and the end of the bolts bear on the steel, and do
not thread into it, then those bolts are probably used to remove the
aluminum cones that clamp the cable. If they are used in that manner, they
would be considered jack screws.
Consider this and see if it makes any sense?
I don't know how big this tapered cone is, but I doubt that they would use
something like that as a giant screwed in plug.
Also, if they are using a tapered fitting to grab a cable, then the normal
way to do that would be to have the pull on the cable attempt to pull the
wedges deeper into the tapered hole. Hence the harder the pull, the more
clamping action on the cable.
How did you manage to move that anchor? Load it on a trailer, etc?
Dave
Douglas B Rupp wrote:
>
>
> -----Original Message-----
> From: Douglas B Rupp [mailto:rupp@gnat.com]
> Sent: Wednesday, August 17, 2005 11:26 AM
> To: 'Military Vehicles Mailing List'
> Subject: How do you unscrew an Army anchor?
>
> I bought a 25000 lb anchor at a Government Liquidation auction a while
back.
> I thought at first it was Navy but a) the color is wrong, b) it
> doesn't appear to have ever been in sea water, c) the shape is unusual.
>
> A friend (who was very persuasive) claims it's an Army "dead head"
> used on (for example) a Ranger training course to counterbalance an
> suspended cableway or something similar.
>
> I want to use it for a similar purpose (couterbalance) but I can't get
> the top off. The anchor is made of steel filled with cast iron with a
> hemispherical bottom and a 6' tall 10" diameter post sticking up. In
> the top of the post there's a 2 piece funnel shaped *aluminum*
> clamshell with 6 recessed allen headed bolts in a circle around the
> edge of the clamshell top. There's a 1-3/8" hole at the bottom of the
> "funnel" and wire rope marks on the tapered sides, so it seems clear
> that the clamshell is supposed to come out and apart so that a wire
> rope with a knob on the end can be inserted.
>
> I got the bolts out and the funny thing is that the bolt heads are
> resting on steel anchor, not aluminum, so the bolts aren't holding anthing
*down*.
> The only other purpose they could serve is to prevent the aluminum top
> from rotating. So the only conclusion I can come to is that the
> aluminum top is like a gigantic bolt that unscrews from the anchor
> once 6 smaller bolts are removed. I made an unscrewing tool and put
> about 600 ft-lbs of torque on the top but it didn't budge. The next
> step would be lubrication, heat and more torque.
>
> I'd appreciate hearing from anyone who has seen one of these things
> and knows how they work.
>
> --Douglas Rupp
>
>
>
>
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