Keyboard musical instrument with fallboard located at proper position and rotary connector used for fallboard

摘要

A front fallboard (31), a rear fallboard (32) and a hinge (30) connected between them form in combination a fallboard assembly (UNT) connected between side arms (13) of a piano cabinet (100) by means of a pair of rotary connectors (CON), and each of the rotary connectors (CON) includes a front metal plate (35) connected to the side surface of the front fallboard (31), a rear metal plate (50) connected to the bottom surface of the side art (13) defining a recess (20) and a rotary damper (55); since the recess (20) is wider than the rear metal plate (50) already combined with the rotary damper (55), the rear metal plate (50) is movable on a virtual plane defined by a fore-and-aft direction and an up-and-down direction; while a worker is seeking the optimum position of the rotary connectors (CON), self-tapping screws (59) keep the rear metal plate (50) in the recess (20) so that the worker drives wood-screws into the side arms (13) through main holes (52) or auxiliary holes (53).