Rack assembly

A rack assembly comprising:

• a vertically extending support post;
• a member to be mounted to said support post;
• said support post consisting of an outer plate portion and a pair of side plate portions so as to be in a shape of a profile, said outer plate portion and each of said side plate portions having at least one vertically elongated engagement hole;
• said member having a front plate portion adapted to abut on said outer plate portion of said support post and a side plate portion adapted to abut on one of said side plate portions of said support post;
• at least one first engaging projection formed integrally with said front plate portion, bent perpendicularly to said front plate portion and adapted to be inserted into said engagement hole formed in said outer plate portion of said support post;
• at least one second engaging projection formed integrally with said side plate portion of said member, bent obliquely in alignment with said front plate portion and adapted to be inserted into said engagement hole formed in said side plate portion of said support post;
• said first engaging projection inserted into said engagement hole formed in said outer plate portion when said member is brought close to said support post from the front side slantwise;
• said second engaging projection inserted into said engagement hole formed in said side plate portion of said support post when said member is moved pivotally after inserting said first engaging projection into said engagement hole formed in said outer plate portion in order to abut said front and side plate portions of said member on said outer and side plate portions of said support post respectively;
• first and second locking pawls formed integrally with and extending downwardly from lower portions of said first and second engaging projections respectively in such a manner that, when said member is lowered after inserting said first and second engaging projections into said engagement holes in said outer plate portion and said side plate portion of said support post respectively, said first and second locking pawls engage with a lower edge of said engagement holes;
• and
• a third locking pawl which is plastically deformable so as to be incapable after being bent of returning to its original form, said third locking pawl being formed integrally with said member at a location above said second engaging projection in such a manner that, when said first and second locking pawls have been engaged with said lower edge of said engagement holes after inserting said first and second engaging projections into said engagement holes respectively, said third locking pawl is in the state of the same plane as said side plate portion of said member and then said third locking pawl is subjected to plastic deformation and is inserted into said engagement hole partially occupied by said second engaging projection and disposed above said second engaging projection.