Patent ID: 6058533
Filing Date: 2000-05-09
Classification: A61G

Abstract:
A bed apparatus comprising:a base;a frame supported on the base for relative movement about a horizontal pivot axis between raised and lowered positions;a drive box supported on the base for pivotal movement about a horizontal axis that is parallel to the pivot axis of the frame;a single bi-directional motor supported in the drive box and presenting an output shaft;a pair of laterally spaced sleeves supported in the drive box for rotation about horizontal axes that are perpendicular to the pivot axis of the frame;at least one transmission element connected between the output shaft of the motor and the sleeves for rotating the sleeves in unison with one another when the motor is operated;a pair of screws supported in the sleeves for relative rotational movement, the screws each including a distal end that is secured to the frame for pivotal movement about an axis parallel to the pivot axis of the frame such that rotation of the sleeves in a first direction extends the screws, moving the frame toward the lowered position, and rotation of the sleeves in the opposite direction retracts the screws, moving the frame toward the raised position.