BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a low-temperature showcase;
FIG. 2 is a schematic vertical side view of the low-temperature showcase of FIG. 1;
FIG. 3 is a perspective view of a lower surface of a shelf to which sockets and an illuminative lamp are attached (Embodiment 1);
FIG. 4 is a partially perspective view of the shelf lower surface (Embodiment 1);
FIG. 5 is a side view of the socket attached to one side of a showroom (Embodiment 1);
FIG. 6 is a partially see-through sectional view of the socket of FIG. 5 (Embodiment 1);
FIG. 7 is a perspective view of a main body side socket member (Embodiment 1);
FIG. 8 is a side view of the main body side socket member (Embodiment 1);
FIG. 9 is a side view of a housing of the main body side socket member (Embodiment 1);
FIG. 10 is a side view of a lid member of the main body side socket member (Embodiment 1);
FIG. 11 is a plan view of FIG. 8 viewed from below (Embodiment 1);
FIG. 12 is a front view of the main body side socket member (Embodiment 1);
FIG. 13 is a diagram showing that a feeder line is attached to FIG. 11 (Embodiment 1);
FIG. 14 is a perspective view of an illuminative lamp side socket member (Embodiment 1);
FIG. 15 is a side view of the illuminative lamp side socket member (Embodiment 1);
FIG. 16 is a diagram of FIG. 15 viewed from the right (Embodiment 1);
FIG. 17 is a diagram of FIG. 15 viewed from the backside (Embodiment 1);
FIG. 18 is a diagram of FIG. 15 viewed from below (Embodiment 1);
FIG. 19 is an enlarged sectional view of a cover portion (Embodiment 1);
FIG. 20 is a schematic diagram showing that the feeder lines and the illuminative lamp are attached to the sockets (Embodiment 1);
FIG. 21 is an electric wiring line diagram of FIG. 20 (Embodiment 1);
FIG. 22 is a partially cut perspective view showing that the socket is attached to the shelf lower surface as viewed from below (Embodiment 1);
FIG. 23 is an enlarged perspective view showing that the socket is attached to the shelf lower surface as viewed from below (Embodiment 1);
FIG. 24 is a partially vertical side view of FIG. 23;
FIG. 25 is an enlarged perspective view showing that the socket is attached to an end portion of the shelf as viewed from below;
FIG. 26 is a side view of the illuminative lamp side socket member showing an illuminative lamp holding portion as another embodiment;
FIG. 27 is a sectional view of FIG. 26;
FIG. 28 is a sectional view of FIG. 26;
FIG. 29 is an exploded diagram showing a thermal insulation cylinder holding portion
FIG. 30 is a side view showing terminal insertion holes according to another embodiment;
FIG. 31 is a perspective view of a shelf lower surface to which sockets are attached (Embodiment 2);
FIG. 32 is a perspective view of the socket (Embodiment 2);
FIG. 33 is a perspective view of a main body side socket member (Embodiment 2);
FIG. 34 is a perspective view of an illuminative lamp side socket member (Embodiment 2);
FIG. 35 is a partially see-through side view of the socket of FIG. 32 (Embodiment 2);
FIG. 36 is a sectional view of FIG. 32 as viewed from the left (Embodiment 2);
FIG. 37 is a sectional view in a state in which an illuminative lamp is attached to FIG. 36 (Embodiment 2);
FIG. 38 is a perspective view of a shelf lower surface to which sockets are attached (Embodiment 3);
FIG. 39 is an internally see-through side view of a main body side socket member (Embodiment 3);
FIG. 40 is a plan view of the main body side socket member viewed from below (Embodiment 3);
FIG. 41 is a side view of an illuminative lamp side socket member viewed from the outside (Embodiment 3);
FIG. 42 is a partially see-through side view of the socket (Embodiment 3);
FIG. 43 is an internally see-through sectional view of a main body side socket member constituting a socket according to another embodiment;
FIG. 44 is a side view of an illuminative lamp side socket member to be attached to the main body side socket member of FIG. 43 as viewed from the outside;
FIG. 45 is a partially see-through sectional view of a socket;
FIG. 46 is an internally see-through sectional view of a main body side socket member constituting a socket according to another embodiment;
FIG. 47 is a side view of an illuminative lamp side socket member to be attached to the main body side socket member of FIG. 46;
FIG. 48 is a partially see-through sectional view of a socket;
FIG. 49 is a vertically side view of a main body side socket member (Embodiment 4);
FIG. 50 is a plan view of FIG. 49 viewed from below (Embodiment 4);
FIG. 51 is a front view of a main body side socket member (Embodiment 4);
FIG. 52 is an internally see-through side view of an illuminative lamp side socket member viewed from the outside (Embodiment 4);
FIG. 53 is a front view of FIG. 52 viewed from the left (Embodiment 4);
FIG. 54 is a sectional view of FIG. 53 (Embodiment 4);
FIG. 55 is a plan view of FIG. 52 viewed from below (Embodiment 4);
FIG. 56 is a sectional view of a socket (Embodiment 4);
FIG. 57 is a schematic diagram showing that feeder lines and an illuminative lamp are attached to conventional sockets; and
FIG. 58 is an electric wiring line diagram of FIG. 57.