Sandwich panel

Abstract

A sandwich panel includes a first plate member and a second plate member, each of which is metallic, a spacer unit which is metallic and formed in the shape of a rectangular frame, and a core member. The core member is arranged in a region surrounded with the spacer unit between the first plate member and the second plate member. The spacer unit is made up of a plurality of spacers that are formed as separate members. The first plate member and the second plate member are bonded to the core member and each of the plurality of spacers.

1 . A sandwich panel comprising:
 a first plate member which is metallic;   a second plate member which is arranged to face the first plate member and metallic;   a spacer unit which is metallic and formed in a shape of a rectangular frame and interposed between the first plate member and the second plate member; and   a core member arranged in a region surrounded with the spacer unit between the first plate member and the second plate member,   the spacer unit being made up of a plurality of spacers that are formed as separate members,   the plurality of spacers not being jointed to each other,   the first plate member being bonded to a surface, facing toward the first plate member, of the core member,   the second plate member being bonded to another surface, facing toward the second plate member, of the core member,   the first plate member being bonded to a surface, facing toward the first plate member, of each of the plurality of the spacers,   the second plate member being bonded to another surface, facing toward the second plate member, of each of the plurality of the spacers,   the plurality of the spacers including at least one straight tubular spacer,   the at least one straight tubular spacer having an opening at a longitudinal end thereof,   the opening being open.   
     
     
         2 . The sandwich panel of  claim 1 , wherein
 the at least one straight tubular spacer includes a pair of straight tubular, longer-side spacers forming a pair of longer sides of the spacer unit in the shape of the rectangular frame,   each of the pair of the longer-side spacers has an opening at each longitudinal end thereof, and   the opening is open.   
     
     
         3 . The sandwich panel of  claim 2 , wherein
 the first plate member includes a side surface portion protruding from a side edge of the first plate member toward the second plate member over an entire length of the first plate member,   the second plate member includes a side surface portion protruding from a side edge of the second plate member toward the first plate member over an entire length of the second plate member, and   
       the pair of the longer-side spacers includes a groove portion to accommodate the side surface portion of the first plate member and another groove portion to accommodate the side surface portion of the second plate member. 
     
     
         4 . The sandwich panel of  claim 2 , wherein
 the plurality of the spacers includes a pair of straight tubular, shorter-side spacers forming a pair of shorter sides of the spacer unit in the shape of the rectangular frame,   each of the pair of the shorter-side spacers has an opening at each longitudinal end thereof, and   the opening is closed by the pair of longer-side spacers.   
     
     
         5 . The sandwich panel of  claim 1 , wherein
 the core is formed from some fibrous inorganic material, and
 the first plate member and the second plate member are bonded to the core member with adhesive.