My memory insists I watched Batman and Robin step on a disk at the base of the pole, and some mechanism raises the disk upwards, accompanied by smoke or steam.
But here it's obvious there's a cushion at the base. So I might be wrong.
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There was an original series episode where the Joker is in Wayne Manor and Batman and Robin need to go from the cave back up the Batpoles. They used a compressed steam lift under the pads to push them back up.