Abstract: This invention relates to a showcase for displaying the commodities used in shops, department stores, etc. More particularly, it relates to a showcase comprising: tube shaped shelf pillars having a plurality of bored holes in a longitudinal direction of an inner wall surface; corner sashes for receiving the shelf pillars, to which glass plates are attached at their sides, the corner sashes respectively covering the circumferences of the shelf pillars; horizontal tubes; joint mechanisms connecting each shelf pillar to each horizontal tube; and shelf assemblies structured with a hook at each end engageable with a hole of the shelf pillar.

Abstract: This device relates to a structural material or joint comprising the combination of: a connector capable of connecting a rectangular pipe in an arbitrary direction, a spacer possible to insert into a penetrating hole perforated in the connector, a rectangular pipe which can be connected with a joint rod of the connector, and a pipe which is possible to install to the spacer.Especially, the structural material or joint according to this device relates to those capable of assembling the structures such as wall face in the shop and inside and outside the house, shelf of the ceiling etc., ornamental materials and the skeleton for the wall face and the like briefly and solidly.

Abstract: A tube joint made of metal such as zinc and the like having a plurality of protruding longitudinal knurling tools. Each of the knurling tools has a wide root end and a narrow pointed end at the central part of the upper and the lower surfaces and of the right and the left sides of a square prism which has each corner cut off to form a fixed groove from the pointed end to the root end. A slight arcuate-shaped protuberance is provided at the central part of each of the longitudinal knurling tools. The knurling tool with its protuberance forms a joint rod having an outer diameter equal to, or slightly larger than the inner diameter of a square pipe into which the outer diameter of the diagonal in the protuberant part of the knurling tool corresponding to the square prism is inserted, in arbitary directions at the connecting part thereof. A plurality of joint rods are connected at their root ends to form the tube joint.