Integrated pogo pin enabling integrated housing

An integrated pogo pin comprising:

• a casing portion rolled up to have a C-shaped cross section;
• an upper elastic portion extending to a length from a first side surface of the casing portion in a first spiral direction toward an upper-end opening along an inner circumferential surface thereof;
• an upper probe portion arranged on a non-stationary end of the upper elastic portion and rolled up to a shape of a cylinder in such a manner as to possibly reciprocate upward and downward within the upper-end opening in the casing portion;
• a lower elastic portion extending to a length from the first side surface of the casing portion in a second spiral direction toward a lower-end opening along the inner circumferential surface thereof;
• and
• a lower probe portion arranged on a non-stationary end of the lower elastic portion and rolled up to the shape of the cylinder in such a manner as to possibly reciprocate upward and downward within the lower-end opening in the casing portion,
• wherein the inner circumferential surface of the casing portion having the C-shaped cross section is positioned a distance away from an outer circumferential surface of the upper probe portion,
• the upper elastic portion is formed as a lengthwise extending body with a first thickness, and the lower elastic portion is formed as a lengthwise extending body with a second thickness,
• the second thickness is smaller than the first thickness,
• an upper surface and a lower surface of the lower elastic portion rolled up in the second spiral direction are brought into contact with each other,
• the casing portion further comprises one or more protrusions, protruding toward the outside thereof, on an external surface thereof,
• a side-surface opening is located between a first side surface and a second side surface of the casing portion rolled up to have the C-shaped cross-section,
• the pogo pin is inserted into a pin hole in a one-piece housing by narrowing a width of the side-surface opening, and
• the pogo pin is prevented from being separated from the housing due to gravity.