Collapsible keyboard

Abstract

A collapsible keyboard comprises a first key assembly, a second key assembly rotatably connected to the first key assembly and a third key assembly rotatably connected to the second key assembly. The first key assembly is located between the second and third key assemblies when the collapsible keyboard is in a collapsed mode, and the first key assembly, the second and third key assemblies are substantially located on the same level when the collapsible keyboard is in an operating mode.

1 - 21 . (canceled) 
   
   
       22 . A collapsible keyboard, comprising:
 a first key assembly comprising a first protrusion and a first recess; and   a second key assembly rotatably connected to the first key assembly and comprising a second protrusion and a second recess;   when the collapsible keyboard is in an operating mode, the first key assembly and the second key assembly are substantially located on the same level, and the first protrusion is fitted in the second recess and the second protrusion is fitted in the first recess.   
   
   
       23 . A collapsible keyboard, comprising:
 a second key assembly;   a third key assembly rotatably connected to the second key assembly;   a linkage respectively pivoted to the second and third key assemblies;   a first side plate pivoted to the second key assembly; and   a second side plate respectively pivoted to the third key assembly and the first side plate.   
   
   
       24 . The collapsible keyboard as claimed in  claim 23 , wherein the second key assembly comprises a third shaft pivoted to an end of the linkage and a fourth shaft pivoted to the first side plate. 
   
   
       25 . The collapsible keyboard as claimed in  claim 23 , wherein the third key assembly comprises a fifth shaft pivoted to an end of the linkage and a sixth shaft pivoted to the second side plate. 
   
   
       26 . The collapsible keyboard as claimed in  claim 23 , wherein the first side plate and the second side plate are substantially parallel when the collapsible keyboard is in the operating mode, and the second side plate is enclosed by the third key assembly and the first side plate. 
   
   
       27 . The collapsible keyboard as claimed in  claim 23 , wherein the first side plate is substantially perpendicular to the second side plate when the collapsible keyboard is in the collapsed mode.