Patent ID: 7646259
Filing Date: 2010-01-12
Classification: H01R

Abstract:
1. A toolless video balun comprising: a bottom cover shell; a circuit board mounted in said bottom cover shell; a winding transformer mounted on said circuit board; a resistor mounted on said circuit board; a diode mounted on said circuit board; a BNC connector mounted on said circuit board and extending out of said bottom cover shell, said BNC connector comprising a front end, a cylindrical block extending from said front end and disposed inside said bottom cover shell, a plurality of metal pins extending out of said cylindrical block and bonded to said circuit board, a rear end suspending outside said bottom cover shell, and a plurality of insertion holes formed in said rear end; a plurality of metal terminals respectively electrically bonded to said circuit board; and a top cover shell covering said bottom cover shell; wherein: said bottom cover shell comprises a semicircular flange extending from an open end thereof, the semicircular flange of said bottom cover shell having two engagement ribs protruding from a top wall thereof and symmetrically disposed at two sides, and a flat surface portion disposed between said two engagement ribs; said circuit board comprises a plurality of via holes for the bonding of said winding transformer, said resistor, said plurality of metal terminals and the plurality of metal pins said BNC connector, and a bonding pad for the bonding of said diode; said cylindrical block of said BNC connector has a flat bottom wall supported on the flat surface portion of the semicircular flange of said bottom cover shell, and a locating groove extending around the periphery thereof and forced into engagement with the engagement ribs of the semicircular flange of said bottom cover shell; said plurality of metal terminals are respectively bonded to corresponding ones of said plurality of via holes of said circuit board, said plurality of metal terminals each having a sharp-edged top metal holder portions respectively inserted into said top cover shell; said top cover shell comprising a terminal block disposed at one end thereof, two insertion slots vertically extending through top and bottom sides of said terminal block, for receiving the sharp-edged top metal holder portions of said metal terminals, a plurality of wire grooves formed in the top side of said terminal block and respectively disposed in communication with said two insertion slots for receiving electrical wires of a network line, an opening disposed adjacent to said plurality of wire grooves, two coupling holes disposed in said opening at two sides, a pressure cap pivoted to said two coupling holes in said opening for holding down the electrical wires of a network line in said plurality of wire grooves for causing the metal holder portions of said plurality of metal terminals to make contact with conductors of the electrical wires respectively, and a semicircular flange extending from an opposite end thereof and pressed on the cylindrical block of said BNC connector against the semicircular flange of said bottom cover shell.