Found me an old rusty rope grab in the shed, dismantled it and greased the roller bearings and somehow managed to get it back together. That was feat what with the rollers wanting to flop around in the pulley bores. Grease makes a good glue I found out.
Anywho, its together and I have a rope, maybe too fat but just for testing. It wasn’t with rope when I found it.
Is there a right way to string it? I took the tag end and fed through the lock arm over top pulley #1 and down to the traveler pulley #1 , up over pulley 2 and down to traveler to pulley 2 there..then up to the top there is a rope cinch cam, that I snugged the tag end into to keep it affixed to the stationary hook point.
The other end is what ya pull to lift and lock the cam that jams the upper pulleys to lock..yanking outward un locks the cam.
Sound right so far? I didn’t try a load yet, just got wondering if I threaded it all right.
Anyone have one or a picture or a really good description of the threading?
TIA as always.
Spheramid Enterprises Architectural Woodworks
Repairs, Remodeling, Restorations
“If Brains was lard, you couldn’t grease much of a pan”
Jed Clampitt
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I got about 50 of them in a barrel at home.
All SS and anodized Al..... no steel to corrode.
If you have use for 1 in good shape PM me your address and I'll fire one off to ya when I get back home.
I don't think I really "need" this one, it was just hanging ina shed and I figured I'd clean it up and have it handy. I had a much better one , bigger rope size, years ago , but it got stolen from the back of my truck.I might take ya up on that if I find this one either unusable or a sudden need for the like. I know they are handy as heck.Thanks.Spheramid Enterprises Architectural Woodworks
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"If Brains was lard, you couldn't grease much of a pan"Jed Clampitt
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Yeah I thought I could use a bunch of them also... it was some lagniappe thrown in at a Dow chemical auction.
Now I got a pile of em I can't think of one good use for them.
Let me know if ya need one
What the heck, I'll fire off an email w/addy and pay shipping at least.I do kinda miss my old one, and this one seen better days for sure.
THNX.Spheramid Enterprises Architectural Woodworks
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"If Brains was lard, you couldn't grease much of a pan"Jed Clampitt
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Not sure I have even seen one. Got a picture?
"Put your creed in your deed." Emerson
"When asked if you can do something, tell'em "Why certainly I can", then get busy and find a way to do it." T. Roosevelt
Uhhh. I kinda could but it would be an act of gawd to pull it off, I'm on a crummy pooter till I get my LT fixed, it has wrong mem card plugged into the slot and can only barely run FFox , anything else I get all sorts of wierd stuff going on or it crashes.Just picture two double sheaves and a lever that the rope passes thru that can trigger an arm that locks the pulleys.Spheramid Enterprises Architectural Woodworks
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"If Brains was lard, you couldn't grease much of a pan"Jed Clampitt
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Oh, yeah, uh, ok, that's clear as mud."Put your creed in your deed." Emerson
"When asked if you can do something, tell'em "Why certainly I can", then get busy and find a way to do it." T. Roosevelt
Sorry I got a fone call in the middle of that.It's like a block and tackle, you seen them right? Well, side by side upper pulleys and side by side lowers, those are the blocks...a hanging hook on one, and a grab hook on the other. When ya pull the rope it gets more distance/force ratio and can lift stuff, the arm that locks releases so the load can be lifted and held, then released to drop.I can't even get a google pic. Sorry.Spheramid Enterprises Architectural Woodworks
Repairs, Remodeling, Restorations
"If Brains was lard, you couldn't grease much of a pan"
Jed Clampitt
Edited 8/11/2009 4:46 pm ET by Sphere
So it's like a block & tackle with a lock?
'zaxctly. double pulleys on each block, total rope is 4x the length.Spheramid Enterprises Architectural Woodworks
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"If Brains was lard, you couldn't grease much of a pan"Jed Clampitt
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>>>"If Brains was lard, you couldn't grease much of a pan"
Jed ClampittOh man.... just sprayed spit all over the screen....
You must have personal sigs turned off if you just saw that now, been a tagline for awhile now..about time to find a new one.Spheramid Enterprises Architectural Woodworks
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"If Brains was lard, you couldn't grease much of a pan"Jed Clampitt
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I see now....for some reason it appeared as plain black text rather than part of your "fancy" Spheramid blue text display. Goes to show you how much I pay attention to that stuff.Glad I caught it this time though....classic line.
editing in FFox will do that depending on a few things, it won't appear that way on my other pooter...This one is trying patience something awful, but I can't afford to fix my other one yet..baaah.I can USE the other one, but have to use the TV as a monitor and a short video cable..ever sit right in front of a 42" LCD and try to type? Now try it with bifocals..and the wife wanting to watch TV , and four dogs getting tangled in the cable...you get the drift.Spheramid Enterprises Architectural Woodworks
Repairs, Remodeling, Restorations
"If Brains was lard, you couldn't grease much of a pan"Jed Clampitt
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If I understood your post correctly you rigged it the right way.
Here is how I do it. I hang the top block up temporarily, off a ladder or something. The snatch block ( lower block) sits on the floor for now. Set the coil of rope on the floor and to your left. Pull one end of rope up and over the left pulley,then down to the snatch block. Then thru the left pulley of the lower block.
Now take free end and go up and over the right top pulley.Then down and thru the right lower block pulley. Finally , take the end and tie off to the top pulley purchase, and your done rigging. Raise the top block to where you need it. When you pull on the rope from the coil you will gain an advantage of 2 to 1 when using a block and tackle with two pulleys on each block. If you had 150lbs as the weight, you will be lifting half or 75 lbs. If the blocks had 3 pulleys each then the advantage would be 3 to 1 and then you will lift 50 lbs.
I hope I explained it well, sometimes i confuse myself.
mike
I thought the force reduction was not calculated by the number of pulleys, but by the number of lines. So a 4 pulley setup wopuld have ... 8 lines? "Put your creed in your deed." Emerson
"When asked if you can do something, tell'em "Why certainly I can", then get busy and find a way to do it." T. Roosevelt
Eddie, the line is continous,so actually we are speaking of one line. You probably meant that you see 8 lines with four pulleys top and bottom.That's correct and there is a total of 8 pulleys and the weight described would take 150lbs divided by 4= 37.50 lbs to pull.
The largest I have used is a 4 pulley block. Almost takes a crane to lift the thing .I imagine without the rope the top block must weigh 75 to 100 lbs.When I was a kid I had to haul one of these behomoths up a forty foot ladder and hang it from a steel beam. This block and tackle was set up above a very large lathe (metal ) and was used mostly for changing chucks . Grandpa didn't believe in electric hoists,as long as he had big grandsons.Just kidding, the block and tackle were temporary until the hoist motor was rewound.
mike
fast Eddie,
Yes, but what you want is the number of lines supporting the load, so, if you have two sheaves in the lower block, you might have four lines supporting the load giving you a mechanical advantage of four (less friction losses). You might have five lines supporting the load if the line ends at the lower block.
And, of course, there are exceptions. The Spanish Burton tackle is made up of three single sheave blocks. There are two lines at the load and a mechanical advantage of three, less friction, I think.
Pretty sure I have it right, I had to go thru the lock arm (hollow) before the first pulley. I mean it ain't a rocket ship (G). But ya never know when there is way that makes it work better that isn't obvious.Spheramid Enterprises Architectural Woodworks
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"If Brains was lard, you couldn't grease much of a pan"Jed Clampitt
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Is the attached picture what you're talking about?I've never heard of them being called a "Rope Grab Hoist". We always called it a "fence stretcher". We used to use 'em to stretch barbed wire whan we built fences.
Q: What do barbed wire and bikinis have in common?
A: They both protect the property but don't obstruct the view.
Thats EXACTLY it ( cept for the red paint) right down to the extra hooks and cams on the hooks. I have the rope wrong according to your pic, I went back up to the top hook and got it in the little cam action lever insted of knotted below the pulleys..Thanks for the pic and right name.Spheramid Enterprises Architectural Woodworks
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"If Brains was lard, you couldn't grease much of a pan"Jed Clampitt
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Glad I could help.I didn't really need that one. But I found it at a yard sale and talked the lady down to $5. (She had no clue what it was) It looks like it's never been used.I used Dad's old one a few years back to teach some scouts about mechanical advantage for their engineerign merit badge. I hooked it up to a can and had them pull the car using the fence stretcher. They seemed to think it was pretty cool.
Take as much as you want, put back more than you take.
Mine was hanging in the shed when I bought the place in 03, just now got in far enough to rescue it. It musta been buried in the clay for a long time, it was locked up and ugly. Just started futzing with it and before I knew it I had it apart and greased up.We had fencing here, that could explain it.I know they are handy when they work right. Gotta gp find something to yank around now. (G)Spheramid Enterprises Architectural Woodworks
Repairs, Remodeling, Restorations
"If Brains was lard, you couldn't grease much of a pan"Jed Clampitt
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Nice collection of antique tools. They might be a welcome addition to the farm blog. I see a froe, a sythe, a broad axe, a crosscut saw....Scott.
Edited 8/11/2009 9:23 pm by Scott