Escalator

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early 20th century (originally US, as a trade name): from escalade ‘climb a wall by ladder’ (from escalade), on the pattern of elevator .

wiktionary

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From the former trademark Escalator, created by American inventor Charles Seeberger in 1900, from Latin e(“from, out of”) + scala(“ladder”) + -tor, which forms nouns of agency. See the appendix. Broader usage may be influenced by escalate. For an alternative etymology, see Online Etymology Dictionary. [1].

etymonline

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escalator (n.)

1900, American English, trade name of an Otis Elevator Co. moving staircase, coined from escalade + -ator in elevator. Figurative use is from 1927 (in advertising).