| 摘要 |
This invention provides a dental chair having a seat, toeboard, and back, the toeboard and back being pivotal relative to the seat. A bladder unit fits on the seat and toeboard, defining a plurality of chambers containing opencelled foam plastic and air at atmospheric pressure, interconnected by narrow passageways. This provides for displacement of the air to the location of low weight when the seat is occupied to provide support behind the knees irrespective of the height of the occupant. At the bottom of the seat back is a pad that includes a bladder which is compressed as the seat back is lowered to be displaced outwardly so that it acts as a lumbar support. At the upper end of the seat back is a pivotal plate beneath which is a bladder which can be inflated to raise the shoulders of the occupant. On the headrest is a head support with a recess complementary to the back of a human head, pivotally connected to a base which in turn rests on three bellows. Selective inflation of the bellows can tilt the head to either side or raise it to move the oral cavity downwardly.
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