IC socket for electrical parts with improved electrical contact

Abstract

An socket for an electrical part comprises a socket body provided with a mount portion on which an IC package as “electrical part” is mounted, a plurality of contact pins attached to the socket body so as to be electrically conductive to an IC lead of the IC package, and an upper operation member provided for the socket body to be vertically movable. The contact pins are provided with a stationary contact piece having a stationary contact portion contacting a lower surface of the IC lead and a movable contact piece having a movable contact portion contacting an upper surface of the IC lead, and when the upper operation member is vertically moved, the movable contact portion is displaced so as to be contacted to or separated from the terminal. In such an IC socket as “socket for an electrical part” contacted to or separated from the IC lead, the stationary contact piece of the contact pin is formed with an engagement portion to be engaged and the socket body is formed with an engaging portion for limiting the upper movement of the stationary contact piece in engagement with the engagement portion.

1. A socket for an electrical part comprising:
 a socket body provided with a mount portion on which an electrical part is mounted;  
 a plurality of contact pins attached to the socket body so as to restrict a downward movement of the contact pins with respect to the socket body, each of said pins being connected to a terminal of the electrical part so as to establish an electrical connection between the contact pin and the terminal; and  
 an operation member provided for the socket body to be vertically movable with respect to the socket body,  
 each of said contact pins being formed with a stationary contact piece having a stationary contact portion contacting a lower surface of the terminal of the electrical part and a moveable piece having a movable contact portion contacting an upper surface of the terminal of the electrical part,  
 said movable contact portion being contacted to or separated from the terminal of the electrical part in response to a vertical movement of the operation member, and  
 said stationary contact piece of the contact pin being provided with an engagement portion and said socket body being formed with an engaging portion to be engaged with an upper surface of said engagement portion to thereby limit an upper movement of the stationary contact piece.  
 
     
     
       2. The socket for an electrical part according to  claim 1 , wherein said socket body comprises a base member to which said contact pins are attached and a seating plate to which the mount portion is formed, said seating plate being formed with the engaging portion, and when said seating plate is mounted to said base member, said engagement portion of the contact pin is engaged with said engaging portion. 
     
     
       3. The socket for an electrical part according to  claim 1 , wherein said seating plate is formed with a guide portion for guiding said stationary contact piece so as to engage the engagement portion of the contact pin with the engaging portion of the seating plate when said seating plate is mounted to the base member. 
     
     
       4. The socket for an electrical part according to  claim 1 , wherein said stationary contact piece is formed with a springy portion which is elastically deformable against a force in a vertical direction. 
     
     
       5. A socket for an electrical part comprising:
 a socket body provided with a mount portion to which the electrical part is mounted;  
 a plurality of contact pins attached to the socket body so as to restrict a downward movement of the contact pins with respect to the socket body, each of said contact pins being connected to a terminal of the electrical part so as to establish an electrical connection between the contact pin and the terminal; and  
 an operation member for the socket body operable to be moved vertically with respect to the socket body, 
 each of said contact pins being formed with a stationary contact piece having a stationary contact portion contacting a lower surface of the terminal of the electrical part and a movable contact piece having a movable contact portion contacting an upper surface of the terminal of the electrical part,  
 said movable contact portion being contacted to and separated from the terminal of the electrical part with the movable contact portion being moved in response to a vertical movement of the operation member, and  
 said stationary contact piece of the contact pin being provided with an engagement portion protruding substantially vertically from a side surface of the stationary contact piece, and said socket body being formed with an engaging portion having a lower surface being engaged with an upper surface of said engagement portion of the stationary contact piece to thereby correctly maintain an attitude of the stationary contact piece.  
 
 
     
     
       6. A socket for an electrical part comprising:
   a socket body provided with a mount portion on which an electrical part is mounted;        a plurality of contact pins attached to the socket body so as to restrict a downward movement of the contact pins with respect to the socket body, each of said pins being connected to a terminal of the electrical part so as to establish an electrical connection between the contact pin and the terminal; and        an operation member provided for the socket body to be vertically movable with respect to the socket body,        each of said contact pins being formed with a stationary contact piece having a stationary portion contacting a lower surface of the terminal of the electrical part and a movable piece having a movable portion contacting an upper surface of the terminal of the electrical part,        said movable contact portion being contacted to or separated from the terminal of the electrical part in response to a vertical movement of the operation member, and        an engagement portion being formed in the vicinity of the mount portion and engaged with an upper surface of an engagement portion formed on the stationary contact piece of the contact pin to thereby limit an upper movement of the stationary contact piece.