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Ben · 07-26-2006, 01:06 PM

A problem with current rubber CPS systems is that stacking rubber over rubber is difficult. I have designed a device to remedy this problem.

After noting that the power of my new pressure chamber was slightly lower than the original without additional layers (given ~2 - 3 feet less of range), I do believe that the amount of clearance is important. Indeed, with less clearance the inner tube receives less contact when it contracts to smaller than the larger tube's diameter. So, having a tube to layer over another tube that has the same or a similar diameter is ideal.

This device I speak of will essentially be like the shoe-stretchers except different. It will use 4 metal rods pulled slowly outward by a rope and hand-crank system (for torque) to expand the tubing. The ropes from the metal rods obviously will be attached to some sort of structure. I'm still working on the locking mechanism in my head. A device like this to expand the tubing should make applying additional layers easy! Just load the tubing into the device, turn the crank until it is wide enough, lock it, and then insert the smaller tube to be layered over.

If someone couldn't make a good drawing of what I am detailing, I'll make a notebook paper drawing.

Silence · 07-26-2006, 02:39 PM

Sounds good, but with all that force, perhaps there should be something on the other end of the tub to make sure the four rods don't come together on that side. It would be hard to do, but it might be more practical than an incredibly strong device.

EDIT: I suppose the edges of the rods on the opposite side of the expander from the rubber can be connected, allowing for a "conical" expansion. It wouldn't be even, but maybe the larger mouth would actually make accessing the inside of the easier.

You could use four strings that go through the outer inner (no pun intended

) tube or LRT and pull out on both sides of each string. Also, a pulley system would make pulling equally on all the string ends a bit easier. However, no matter what method you use and unless you've found a workaround, it will be just as hard getting the rods or string out as pushing in the smaller tube the traditional way would be. Perhaps it would be easier to collapse the inner inner (no pun intended this time, either

) and make it easier to slide more tubing on top of...

And remember, as somebody said in the Colossus thread, you can coat the tubing with talcum powder or something else to make it smoother. It does sound like it would work wonders...

Ben · 07-26-2006, 04:34 PM

I don't think you understand how I will make this. The tubing expands like a square getting larger, evenly on both ends of the tube. The pipe remains parallel. Easy to do and would work perfectly. The only trouble is finding small and strong pipe.

A picture probably was necessary, but I think I'll let the finished product be the picture.

joannaardway · 07-27-2006, 12:15 PM

Sounds a bit complex to me, but after you've done it, I imagine you could sell layered LRT like spudtech does rifled PVC.

I have no objection to this idea.

07-26-2006, 01:06 PM	#1
Ben Founder Join Date: Mar 2003 Location: Maryland Posts: 5,955 UserID: 1	Device to expand rubber tubing A problem with current rubber CPS systems is that stacking rubber over rubber is difficult. I have designed a device to remedy this problem. After noting that the power of my new pressure chamber was slightly lower than the original without additional layers (given ~2 - 3 feet less of range), I do believe that the amount of clearance is important. Indeed, with less clearance the inner tube receives less contact when it contracts to smaller than the larger tube's diameter. So, having a tube to layer over another tube that has the same or a similar diameter is ideal. This device I speak of will essentially be like the shoe-stretchers except different. It will use 4 metal rods pulled slowly outward by a rope and hand-crank system (for torque) to expand the tubing. The ropes from the metal rods obviously will be attached to some sort of structure. I'm still working on the locking mechanism in my head. A device like this to expand the tubing should make applying additional layers easy! Just load the tubing into the device, turn the crank until it is wide enough, lock it, and then insert the smaller tube to be layered over. If someone couldn't make a good drawing of what I am detailing, I'll make a notebook paper drawing. __________________ email: ben at sscentral dot org / Forum rules Read this page before emailing me. Do not send me a PM or email with a question if someone else could answer the question. Post at the forums so others could offer their take. Do not send me a PM or email about reading a certain post unless it's been a few days since you've posted. I try to read every post.

07-26-2006, 02:39 PM	#2
Silence Administrator Join Date: Apr 2006 Location: Virginia Posts: 3,244 UserID: 576	Sounds good, but with all that force, perhaps there should be something on the other end of the tub to make sure the four rods don't come together on that side. It would be hard to do, but it might be more practical than an incredibly strong device. EDIT: I suppose the edges of the rods on the opposite side of the expander from the rubber can be connected, allowing for a "conical" expansion. It wouldn't be even, but maybe the larger mouth would actually make accessing the inside of the easier. You could use four strings that go through the outer inner (no pun intended ) tube or LRT and pull out on both sides of each string. Also, a pulley system would make pulling equally on all the string ends a bit easier. However, no matter what method you use and unless you've found a workaround, it will be just as hard getting the rods or string out as pushing in the smaller tube the traditional way would be. Perhaps it would be easier to collapse the inner inner (no pun intended this time, either ) and make it easier to slide more tubing on top of... And remember, as somebody said in the Colossus thread, you can coat the tubing with talcum powder or something else to make it smoother. It does sound like it would work wonders... __________________ Forum Rules Last edited by Silence : 07-26-2006 at 03:14 PM.

07-26-2006, 04:34 PM	#3
Ben Founder Join Date: Mar 2003 Location: Maryland Posts: 5,955 UserID: 1	I don't think you understand how I will make this. The tubing expands like a square getting larger, evenly on both ends of the tube. The pipe remains parallel. Easy to do and would work perfectly. The only trouble is finding small and strong pipe. A picture probably was necessary, but I think I'll let the finished product be the picture. __________________ email: ben at sscentral dot org / Forum rules Read this page before emailing me. Do not send me a PM or email with a question if someone else could answer the question. Post at the forums so others could offer their take. Do not send me a PM or email about reading a certain post unless it's been a few days since you've posted. I try to read every post.

07-27-2006, 12:15 PM	#4
joannaardway Do not adjust your TV set Join Date: Feb 2006 Location: SW Hertfordshire, England Posts: 875 UserID: 549	Sounds a bit complex to me, but after you've done it, I imagine you could sell layered LRT like spudtech does rifled PVC. I have no objection to this idea. __________________ "Over the hills and far away, she prays he will return one day. As sure as the rivers reach the seas, back in his arms again she'll be." - Over the Hills and far away, Gary Moore "So many people have come and gone, their faces fade as the years go by. Yet I still recall as I wander on, as clear as the sun in the summer sky" - More than a feeling, Boston

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