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csor77
2 years ago

Looks like this in the door:

On the crank you turn and the “table” lifts and lowers the disk in the door.

Edit:

Catfish1980
2 years ago

Alternatively to this variant also gives the possibility of a cable pull. The disc is pulled up and down by means of a wire rope on a shaft.

Minijobopa
2 years ago

There are many different mechanisms depending on the manufacturer. wickipedia gives information.

Grantchester
2 years ago

The crank rotates a gear that acts on a rack. This is attached to the lower edge of the disc and lifts and lowers the leg.