Bakable multi-pins vacuum feedthrough

Claim 1

In combination with a vacuum vessel having a wall with an aperture therein, a bakable multi-pin vacuum feedthrough comprising a metal cylinder having at one end a thin cylindrical wall portion and at the opposite end a thick cylindrical wall portion with an internal shoulder separating said two cylindrical wall portions, a disc-shaped ceramic pin-holder received in said thin cylindrical wall portion and seating on said shoulder, and a plurality of parallel metal terminal pins extending through said pin-holder and projecting from both faces thereof, said pins having at both ends rounded male portions which are recessed inwardly of the respective ends of said metal cylinder, an end portion of said thin cylindrical wall portion being received in said aperture and circumferentially welded to said wall at a location spaced axially inwardly (toward the evacuated interior of said vessel) from said pin-holder, the portion of said metal cylinder in which said pin-holder is received being free of said wall and said thin wall portion of said metal cylinder serving as a flexible skirt to absorb welding distortion so that it does not affect said pin-holder, first sealing means adjacent the inner (vacuum) face of said pin-holder providing a seal between said pin-holder and each of said pins and second sealing means spaced axially outwardly from the inner face of said pin-holder providing a seal between the periphery of said pin-holder and said thin cylindrical wall portion of said metal cylinder, said second sealing means being displaced axially outwardly from said first sealing means, the axially inner portion of said pin-holder in which said first sealing means is provided being free of said thin cylindrical wall portion of said metal cylinder, and said pin-holder having an annular recess surrounding each of said pins and extending inwardly from the outer (atmosphere) face of said pin-holder.