Pulley system with equal spacing

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  • #1
youp tulpin
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Dear readers,

I want to design a pulley system like in the schematic below, a system where the distance between certain attachment points are equally spaced along a vertical bar. The main feature of these pulleys is that when a force (F) is applied on one end of the cable, the attachment points (A, B, C) move upwards and the distance between them closes and stays the same between point A and B but also between B and C, much like the crossing joints of a scissor mechanism.

Any ideas?

Kind regards.
 
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  • #2
youp tulpin said:
Dear readers,

I want to design a pulley system like in the schematic below, a system where the distance between certain attachment points are equally spaced along a vertical bar. The main feature of these pulleys is that when a force (F) is applied on one end of the cable, the attachment points (A, B, C) move upwards and the distance between them closes and stays the same between point A and B but also between B and C, much like the crossing joints of a scissor mechanism.

Any ideas?

Kind regards.
IMG_5968.jpeg
 
  • #3
Welcome to PF.

So you want;
A to rise at a speed of 1.
B to rise at a speed of 2, and
C to rise at a speed of 3.
They will all reach the top at the same time.
 
  • #4
Welcome? :cool:
Besides the pulleys, what type of mechanism do you have in mind?
Can you provide a diagram of your general idea, please?



 
  • #5
Here, the three systems are shown separated. There may be duplicated pulleys when all three are combined. Notice that the top pulleys are anchored, but the lower pulley blocks are moved by a distance of T.

The movement of length T, results in a movement determined by the number of falls to T.
1T for point A; 2T for point B; 3T for point C.

1,2,3_Pulleys.jpg
 
  • #6
Baluncore said:
Here, the three systems are shown separated. There may be duplicated pulleys when all three are combined. Notice that the top pulleys are anchored, but the lower pulley blocks are moved by a distance of T.

The movement of length T, results in a movement determined by the number of falls to T.
1T for point A; 2T for point B; 3T for point C.

View attachment 341297
Sorry for the late reply, I understand how to progress my idea with these sketches, thank you!

I will also look into the telescopic sliders recommended by @Lnewqban, it might even be what I needed in the first place.

Cheers!
 
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Likes berkeman and Lnewqban

FAQ: Pulley system with equal spacing

What is a pulley system with equal spacing?

A pulley system with equal spacing refers to a mechanical setup where multiple pulleys are arranged at regular intervals. This configuration is often used to distribute weight evenly and reduce the effort needed to lift or move heavy objects.

How does a pulley system with equal spacing work?

In a pulley system with equal spacing, ropes or cables run through the pulleys, creating a mechanical advantage. The equal spacing ensures that the load is evenly distributed across all pulleys, which minimizes the strain on any single pulley and makes it easier to lift or move the load.

What are the benefits of using a pulley system with equal spacing?

The primary benefits include reduced effort to lift heavy loads, even distribution of weight, and increased efficiency in mechanical operations. This setup also helps in minimizing wear and tear on individual pulleys and ropes, thereby extending the lifespan of the system.

Where are pulley systems with equal spacing commonly used?

These systems are commonly used in industrial settings, construction sites, and in various types of machinery. They are also utilized in theatrical rigging, sailing, and in some fitness equipment to provide consistent and balanced resistance.

How do you calculate the mechanical advantage of a pulley system with equal spacing?

The mechanical advantage (MA) of a pulley system is calculated by counting the number of rope segments supporting the load. In a system with equal spacing, this can be easily determined by the number of pulleys used. For example, if there are 4 pulleys, the mechanical advantage is 4, meaning the effort needed to lift the load is reduced by a factor of 4.

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