Rosenberg, Klein & Lee
Keyboard support device on a desk
 A keyboard support device for a desk includes two posts each having a catching member so as to slidably engage with a beam connected below a top of the desk. Two rails each have a socket connected to a first end thereof so that the two sockets are respectively pivotally connected to the two posts. Each rail has a member slidably received in a second end thereof and a bar is connected between the two rails so as to maintain the two rails in parallel with each other. A tray is connected to the two members so that a keyboard is put on the tray. The tray can be pivoted and moved relative to the top of the desk. 
A A Y A A
A47B A47B Y10S A47B A47B
inventional inventional additional inventional additional
Chien-Kuo
Chang