# How Can I Connect Two Cylinders Coaxially to Transfer Pulling Force?

• verfu
In summary: The adapter sits on top of a hollow cylinder. The lower cylinder has an inner diameter of 22mm and the upper cylinder has an outer diameter of 44mm.The clutch consists of a turnable ring and some elements which slide in and out radially. The ring has three positions: 0°, -60° and 60°. When the ring is in the 0° position the ring and the elements inside the clutch are in contact. When the ring is in the -60° position the elements inside the clutch are sliding outwards. And when the ring is in the 60° position the elements inside the clutch are sliding inwards.When the ring is turned the adapters gets stuck in one of the positions.There
verfu
TL;DR Summary
connecting two cylinders and at the same time strings inside them, with a twist of a ring on one of the cylinders
Hello everyone,

I’m trying to build a coupling system between two cylinders to connect them coaxially and transfer pulling force from a string on the surface of cylinder one to a string inside cylinder two. Please have a look at the sketches attached. Both of the cylinders have an outer diameter of 44mm and the upper one is hollow with an inner diameter of 22mm. On top of the lower cylinder sits a clutch which consists of a turnable ring and some elements which slide in and out radially. By turning the ring 60 degrees either clockwise or counter clockwise an adapter which sits on the upper cylinder gets stuck in the clutch. So there is one open position of the ring/clutch at 0° and two closed positions at -60° and 60°. Until here everything works fine.

Now to my problem. From outside the lower cylinder two strings enter the clutch below the ring. One of them is a loop and passes through the clutch. I want to be able to transfer either a pulling force of approximately 80N from string B to some structure inside the hollow upper cylinder (skipping the structure idea and connecting the strings from lower and upper cylinder directly would be even better but I didn’t find a solution for that) or a similar force from this structure to string A. Which of the strings is connected to this structure depends on in which closed position the ring is. So turning the ring to the left (-60°) should connect the structure to string A and turning it to the right (+60°) should connect the structure with string B. The mechanism should work no matter in which angular orientation I stick the adapter into the clutch. In the end I will 3d-print the whole thing and use dyneema ropes with a diameter of approximately 1mm as strings.

I’ve tried several solutions but none of them worked good enough. I would be really grateful if anyone would come up with an idea how to solve this problem.

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Your explanation is hard to follow, since schematics don't show A or B.

Lnewqban said:
Your explanation is hard to follow, since schematics don't show A or B.

In one of the schematics the two strings which go into the clutch are labeled "string A" and "string B".
I didn't go into detail on how the rest of the clutch works because my intention was to keep it as simple as possible.
There are three jaws in the clutch. When the ring is open they can slide radially outwards a bit. In the open position it is possible to press the adapter into the clutch. When the ring is then turned (60° or - 60°) those jaws slide towards the adapter and fixate it. Now it's not possible to pull the cylinders apart or rotate them against each other.
In this position I should be able to transfer a pulling force from the string in the uper cylinder to one of the strings in the lower.

## 1. What is a tricky coupling mechanism?

A tricky coupling mechanism refers to a complex system or process in which two or more components are connected or interact with each other in a non-obvious or unexpected way. This can make it difficult to understand or predict the behavior of the system.

## 2. How does a tricky coupling mechanism affect scientific research?

A tricky coupling mechanism can complicate scientific research by introducing additional variables and uncertainties that must be accounted for. It may also require specialized techniques or equipment to study and understand.

## 3. Can you provide an example of a tricky coupling mechanism?

One example of a tricky coupling mechanism is the interaction between the Earth's atmosphere and its oceans. The exchange of energy and matter between these two systems is complex and can have a significant impact on climate and weather patterns.

## 4. How do scientists study or address tricky coupling mechanisms?

Scientists use a variety of methods to study and address tricky coupling mechanisms, including mathematical modeling, computer simulations, and experimental techniques. They also collaborate with experts in different fields to gain a more comprehensive understanding of the system.

## 5. Why is it important to understand tricky coupling mechanisms?

Understanding tricky coupling mechanisms is crucial for accurately predicting and managing complex systems, such as climate, ecosystems, and technological networks. It also allows scientists to identify potential problems or vulnerabilities and develop strategies to mitigate or prevent them.

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