Spring contact and a socket embedded with spring contacts

A socket embedded with spring contacts, comprising:

• an upper plate (661), a lower plate (662) and a plurality of guide pins (663), thereby forming a socket (660) in which a plurality of spring contact receiving holes having predetermined shapes are formed in each of the upper plate (661) and the lower plate (662), wherein
• spring contacts (630, A), in which a contact portion (621) of each of lower contact pins (620) is offset from a contact portion (611) of each of upper contact pins (600), and spring contacts (650, B), in which the contact portion (611) of the lower contact pin (620) is concentric with the contact portion (621) of the upper contact pin (600), are arranged in order of A, B, A, in which the upper contact pins (600) are arranged in a straight line, in which a pitch (P) between the upper contact pins (600) is reduced to ⅓ of a pitch between the spring contacts (650) that are arranged in a straight line and in which the contact portion (621) of each of the plurality of lower contact pins (620) is concentric with the contact portion (611) of the upper contact pin (600);
• and
• various kinds of eccentric spring contacts (650, C, A), which have different offset distances between the upper and lower contact portions (611 and 621), and the concentric spring contacts (650, B), in which the upper and lower contact portions (611 and 621) are concentric with each other, are arranged in a combinatory manner to form a straight arrangement of C, A, B, A, C, thereby forming an in-line fine pitch socket structure in which the pitch between the upper contact pins (600) or between the lower contact pins (620) is reduced to one of a plural number.

A spring contact having an upper contact pin, a lower contact pin and a spring, comprising:

• a lower contact pin (710) including a contact portion (711) having a plate-shaped structure and a body thickness t, two spring holding surfaces (714) that are provided in left and right sides of the contact pin so as to limit a length of the spring (701) and prevent the spring from being undesirably displaced, and a body (718);
• an upper contact pin (705) coupled to the lower contact pin (710) in such a way that the two contact pins cross each other at right angles, the lower contact pin (705) having a contact portion (735) of a predetermined shape, two spring holding protrusions (732) and two spring holding surfaces (734) that are provided in left and right sides of the contact pin so as to limit the length of the spring (701) and prevent the spring from being undesirably displaced, and a body (718);
• and
• a spring (701) fitted over an assembly of the lower contact pin (710) and the upper contact pin (705) at a position between the upper and lower contact pins, wherein
• the body (718) of each of the lower contact pin (710) and the upper contact pin (705) has two symmetric elastic portions (719), an end of each of which has a thickness t1 that is less than the body thickness t, with an oblique surface (722), a locking protrusion (721) and a locking protrusion contact surface (723) being provided in the end of each of the two symmetric elastic portions (719), in which a moving slit (720) is defined between the two elastic portions (719) so as to form a moving space when the upper contact pin (705) and the lower contact pin (710) are assembled with each other, with a stop surface (725) being formed on an end of the moving slit (720) and having left and right oblique surfaces (726) so that, when the upper contact pin is compressed against the lower contact pin to a maximum, the stop surfaces (725) of the two contact pins come into contact with each other and stop the compression, and moving grooves (716) are formed in each of the lower and upper contact pins (710 and 705) so that the locking protrusions (721) of the lower and upper contact pins can be moved and stopped, and the moving grooves (716) of the lower and upper contact pins (710 and 705) are brought into electric contact with the locking protrusion contact surfaces (723) of the lower and upper contact pins (710 and 705), in which the moving grooves (716) are formed on upper and lower surfaces of each of the lower and upper contact pins (710 and 705), respectively, first ends of the moving grooves (716) of each of the lower and upper contact pins have a stop hole (727) that forms a stop bridge (717) for stopping the locking protrusions (721) of an opposite contact pin, and second ends extend in directions toward the contact portion (711) after passing the spring holding surfaces (714) that function to limit the length of the spring (701) and to prevent the spring from being undesirably displaced;
• and
• the two spring holding surfaces (714) of the lower contact pin (710) further extend so as to form an assembly stop surface (713) for inserting the lower contact pin (710) into a molded socket body (741) under pressure, in which the spring holding protrusions (732) further extend in opposite directions, with a pressure holding protrusion (730) being formed on an end surface (729) of each of the spring holding protrusions (732) so as to prevent the lower contact pin (710) from being displaced after the lower contact pin (710) has been inserted into the molded socket body (741), thereby forming a spring contact (700) in which the contact portion (711) of the lower contact pin (710) can be soldered to a PCB.

A socket embedded with spring contacts, comprising one or a plurality of spring contacts having an upper contact pin, a lower contact pin, and a spring, wherein each of the spring contacts (700) includes:

• a lower contact pin (710) having a contact portion (711) of a predetermined plate shape and a body thickness t, two spring holding surfaces (714) that are provided in left and right sides of the contact pin so as to limit a length of a spring and prevent the spring from being undesirably displaced, and a body (718);
• an upper contact pin (705) coupled to the lower contact pin (710) in such a way that the two contact pins cross each other at right angles, the lower contact pin (705) having a contact portion (735) of a predetermined plate shape, two spring holding protrusions (732) and two spring holding surfaces (734) that are provided in left and right sides of the contact pin so as to limit the length of the spring (701) and prevent the spring from being undesirably displaced, and a body (718);
• and
• a spring (701) fitted over an assembly of the lower contact pin (710) and the upper contact pin (705) at a position between the upper and lower contact pins, wherein
• the body (718) of each of the lower contact pin (710) and the upper contact pin (705) has two symmetric elastic portions (719), an end of each of which has a thickness t1 that is less than the body thickness t, with an oblique surface (722), a locking protrusion (721) and a locking protrusion contact surface (723) being provided in the end of each of the two symmetric elastic portions (719), in which a moving slit (720) is defined between the two elastic portions so as to form a moving space when the upper contact pin (705) and the lower contact pin (710) are assembled with each other, with a stop surface (725) being formed on an end of the moving slit (720) and having left and right oblique surfaces (726) so that, when the upper contact pin is compressed against the lower contact pin to a maximum, the stop surfaces (725) of the two contact pins come into contact with each other and stop the compression, in which
• moving grooves (716) are formed in each of the lower and upper contact pins (710 and 705) so that the locking protrusions (721) of the lower and upper contact pins can be moved and stopped, and the moving grooves (716) are brought into electric contact with the locking protrusion contact surfaces (723) of the lower and upper contact pins (710 and 705), in which the moving grooves (716) are formed on upper and lower surfaces of each of the lower and upper contact pins (710 and 705), respectively, first ends of the moving grooves of each of the lower and upper contact pins have a stop hole (727) that forms a stop bridge (717) for stopping the locking protrusions (721) of an opposite contact pin, and second ends extend in directions toward the contact portion (711) after passing the spring holding surfaces (714) that function to limit the length of the spring (701) and to prevent the spring from being undesirably displaced;
• and
• the two spring holding surfaces (714) of the lower contact pin (710) further extend so as to form an assembly stop surface (713), with spring holding protrusions (732) further extending in opposite directions, with a pressure holding protrusion (730) being formed on an end surface (729) of each of the spring holding protrusions (732) so as to insert the lower contact pin (710) into a molded socket body (741), in which the contact portion (711) of the lower contact pin (710) can be soldered to a PCB, the molded socket body (741) is provided with receiving holes (743) for receiving one or a plurality of spring contacts (700), a through hole (742) is formed in a first end of each of the receiving holes (743) so as to allow the contact portion (711) of the upper contact pin (705) to be exposed outside the receiving hole (743), opposite fitting steps (745) are formed in a second end of the receiving hole (743) so as to exert pressure that holds the pressure holding protrusions (730) that are formed on the end surfaces of the two extended spring holding protrusions (732) of the lower contact pin (710), in which both a distance between opposing side walls (746) of the two fitting steps (745) and a width of each of the two fitting steps (745) are determined according to both a distance between the opposite end surfaces (729) of the spring holding protrusions (732) of the spring contact (700) and a thickness of the lower contact pin (710), pressure stop surfaces (744) are formed in the molded socket body so as to stop the assembly stop surfaces (713) that are formed on the extended spring holding surfaces (714) of the lower contact pin (710), and socket stand-offs (747) are formed in a lower end of the molded socket body (741) so as to allow the socket to be efficiently soldered to the PCB, so that the spring contact (700) is received in the receiving hole (743) of the molded socket body (741) in a state in which the upper contact pin (705) can be vertically moved through the through hole (742) and the contact portion (735) of the lower contact pin (710) can be soldered to the PCB.