Portable housing case for musical instrument

Abstract

A portable housing case particularly for use in receipt of a prescribed musical instrument is basically constituted by a pair of a base board and a top board, which are assembled together using hinges to form a shell, which can be freely closed or opened. The base board has a band-shaped hollow elongated in a longitudinal direction, and the top board has a band-shaped projection elongated in a longitudinal direction, wherein they are formed in prescribed dimensions to be engaged with each other when the case is stacked with the other case. Thus, it is possible to establish a stable stacking relationship between portable housing cases, regardless of sizes and shapes.

What is claimed is:  
     
         1 . A portable housing case comprising: 
 a base board having a frame at a peripheral end portion thereof;    a top board having a frame at a peripheral end portion thereof, which is hinged to the base board to form a shell, which can be freely closed or opened;    a handle that is attached to the frame of the top board or the frame of the base board; and    at least one lock mechanism arranged in connection with the frame of the top board or the frame of the base board,    wherein a band-shaped hollow is formed on an exterior surface of the base board and is extended in a longitudinal direction, and a band-shaped projection is formed on an exterior surface of the top board and is extended in a longitudinal direction.    
     
     
         2 . A portable housing case according to  claim 1 , wherein the band-shaped hollow is formed in prescribed dimensions to substantially match the band-shaped projection when engaged in stacking.  
     
     
         3 . A portable housing case comprising: 
 a pair of boards that are hinged to each other to form a shell, which can be freely closed or opened;    a band-shaped hollow that is formed on an exterior surface of one of the boards and is extended in a longitudinal direction; and    a band-shaped projection that is formed on an exterior surface of the other of the boards and is extended in a longitudinal direction,    wherein the band-shaped hollow is formed in prescribed dimensions to substantially match the band-shaped projection when engaged in stacking.    
     
     
         4 . A portable housing case according to  claim 3 , wherein the band-shaped hollow and the band-shaped projection are arranged at prescribed positions of the boards to establish symmetry with regard to a center axis passing through the center of gravity of the shell.  
     
     
         5 . A portable housing case according to  claim 3  or  4 , wherein the boards are combined together using hinges, and wherein a handle and a lock mechanism are arranged in proximity to frames of the boards, which are arranged opposite to the hinges.  
     
     
         6 . A portable housing case according to  claim 3  or  4 , wherein the band-shaped hollow has open ends in the longitudinal direction.  
     
     
         7 . A portable housing case according to  claim 3  or  4 , wherein the band-shaped hollow has a prescribed width and a prescribed depth, which match a width and a height of the band-shaped projection.  
     
     
         8 . A portable housing case according to  claim 1  or  3 , wherein the shell is shaped to receive a prescribed musical instrument.