Open-close structure for a keyed instrument

摘要

An open-close structure of a slide lid of a keyed instrument which guides the sliding motion of the slide lid includes a pair of inside plates each being arranged at each side of a keyboard and extending into the main body of the keyed instrument. The invention includes a slide lid that is adapted to be guided through an engagement of a pair of pinion-shaped members arranged at each side of the slide lid with a pair of rack-shaped members arranged on the inside plates. Each of the inside plates has a guide path arranged near and extending along the rack-shaped member. The slide lid has a roller arranged near each pinion-shaped member which is adapted to roll on one of the guide paths and support the slide lid so that the pinion shaped members mesh with the rack-shaped members in a condition in which no weight is applied to the rack-shaped members through the pinion-shaped members.