Load and direction-dependent speed // (Electric) chain hoists

In this video, we take a closer look at open-loop (electric) chain hoists:
Where did chain hoists come from? What are the challenges of using chain hoists in event technology? And how do chain hoists actually behave under load? What does this mean for the lifted truss or a rig?
0:00 Intro
0:17 Chain hoist history
1:02 Chain hoists in the event industry
2:04 How a chain hoist with asynchronous motor works
3:55 Example
4:46 Competition
6:44 Scenario 1
7:48 Scenario 2
8:21 Scenario 3
9:30 Conclusion
10:04 Tips