Crane jib and joystick: what they have in common

1. Step 1. Crane jib — is part of — Portal crane. A slewing jib.
2. Step 2. Portal crane — has part — Wire rope. The load hangs on steel cables.
3. Step 3. Wire rope — is part of — Elevator. The car hangs on cables.
4. Step 4. Elevator — has part — Elevator safety brake. Otis’s safety brakes.
5. Step 5. Elevator safety brake — has part — Spring. Springs throw out the catches when the rope goes slack.
6. Step 6. Spring — is part of — Joystick. They return the stick to the centre.

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