Showing papers by "Teradyne published in 1969"

Rack for electronic modules

Abstract: A RACK FOR SUPPORTING A PLURALITY OF ELECTRONIC CONPONENT MODULES IN AN ARRAY PROVIDES MAXIMUM ACCESSIBILITY TO THE SIDE PANELS OF EACH MODULE. THE RACK INCLUDES A SKELETAL FRAME HAVING VERTICAL, PARALLEL BARS ARRANGED TO EMBRACE, AND BE SECURED TO, THE CORNERS OF EACH MODULE WHICH IS SUPPORTED BY THE RACK. THE LATERAL SPAN BETWEEN ADJACENT BARS IS UNOBSTRUCTED SO THAT EACH SIDE PANEL OF EACH MODULE IS EXPOSED FULLY. THE VERTICAL BARS ARE RIGID AND ARE SECURED TO EACH OTHER BY MEANS OF UPPER AND LOWER BRACING ELEMENTS WHICH CONNECT TOGETHER THE UPPER ENDS OF THE BARS AND THE LOWER ENDS OF THE BARS AND DO NOT INTERFERE WITH THE SUPPORTED MODULES. WHEN THE MODULES ARE MOUNTED IN THE RACK, PANELS SPAN ADJACENT VERTICAL BARS SO THAT THE SIDE PANELS COOPERATE WITH THE CROSS BRACES TO DEFINE A RIGID TRIANGULAR STRUCTURE.

Precision incremental stepping device

Abstract: A PRECISION INCREMENTAL STEPPING DEVICE INCLUDING A MOVABLE INDEXING MEMBER HAVING A PLURALITY OF IDENTICAL CONICAL DEPRESSIONS FORMED THEREON AT SPACED REGULAR INTERVALS. A PAIR OF PLUNGERS HAVING IDENTICAL CONICAL ENDS, COMPLEMENTARY TO THE CONICAL DEPRESSIONS ON THE INDEXING MEMBER ARE MOUNTED ABOVE THE INDEXING MEMBER FOR ALTERNATING MOVEMENT THAT IS TOWARD AND AWAY FROM THE DEPRESSIONS SO THAT AS ONE PLUNGER MOVES DOWNWARDLY TOWARD THE INDEXING MEMBER THE OTHER PLUNGER WILL MOVE UPWARDLY AWAY FROM THE INDEXING MEMBER. THE AXES OF THE PLUNGERS ARE SPACED SO THAT WHEN THE CONE OF ONE PLUNGER IS IN ENGAGEMENT WITH A GIVEN DEPRESSION, THE CONE OF THE OTHER, REMOTE PLUNGER WILL BE DISPOSED ABOVE AND IN MISALIGNMENT BETWEEN A SELECTED PAIR OF DEPRESSIONS. WHEN THE POSITION OF THE PLUNGERS IS REVERSED TO MOVE THE REMOTE PLUNGER DOWNWARDLY TOWARD THE INDEXING MEMBER, THE CONE OF THE DOWNWARDLY MOVING PLUNGER IS GUIDED INTO A PREDETERMINED ONE OF THE SELECTED PAIR OF DEPRESSIONS BY MEANS OF A TRUNCATED SURFACE FORMED ON THE CONE WHICH ENGAGES THE DESIRED ONE OF THE DEPRESSIONS. DOWNWARD MOVEMENT OF THE PLUNGER IS CONTINUED UNTIL ITS CONE IS WEDGED INTO AND IS SEATED FULLY, IN COMPLEMENTARY ENGAGEMENT, IN THE PREDETERMINED DEPRESSION TO CAUSE THE INDEXING MEMBER TO ADVANCE BY A PREDETERMINED INCREMENT.