... the Chowpaul is the most ancient, and, as it were, the original from which all the other forms of palanquin may be traced; on this account it is used in all great ceremonies, marriages, processions, etc. The Chowpaul is simply a very light bed or sofa, over which a large bambou forms an arch. But as this is not a sufficient defence against the sun, it is always attended by a servant carrying a chata or parasol.
Source: wiktionary