BNC connector and PC board arrangement

A BNC connector and printed circuit board arrangement includes a PC board and a BNC connector having an insulative body fastened to the rectangular side opening of the PC board and signal and ground terminals connected to the PC board, the insulative body of the BNC connector having two elongated grooves at two opposite sides, which receives the two opposite lateral side walls of the rectangular opening of the PC board, and two wing portions at two opposite sides respectively affixed to the back side of the PC board by self-tapping screws.

BACKGROUND OF THE INVENTION 
The present invention relates to an electrical connector for connecting a 
coaxial cable to a printed circuit board, and more particularly, to 
features of the connector providing wing portions to hold the printed 
circuit board. 
U.S. Pat. No. 4,797,120 discloses a coaxial connector having filtered 
ground isolation means for mounting to a printed circuit board, U.S. Pat. 
No. 4659,156 discloses a coaxial connector with circuit board mounting 
features for the same purpose. U.S. Pat. No. 4,884,982 discloses a 
capacitive coupled connector for the same purpose. These electrical 
connectors have a common feature, i.e. each connector has two posts 
vertically disposed at the bottom for pluggable receipt into respective 
PCB apertures. When plugged into the PCB apertures, the posts are then 
welded to the PC board, as shown in FIG. 1. 
When installed, the whole assembly of the BNC connector (includes the 
insulative body and the BNC jack) is upstanding from the PC board at one 
side, therefore the BNC connector occupies much installation space at one 
side of the PC board, and the size of the outer shell which receives the 
PC board and the BNC connector must be relatively increased. As the BNC 
connector is connected to the PC board simply by the two posts thereof, 
the binding force is weak, and the connection between the BNC connector 
and the PC board may be damaged easily. 
SUMMARY OF THE INVENTION 
The present invention has been accomplished to provide a BNC connector and 
PC board arrangement which eliminates the aforesaid drawbacks. 
According to one aspect of the present invention, the BNC connector and PC 
board arrangement includes a PC board having a rectangular side opening, 
and a BNC connector having an insulative body received in the rectangular 
side opening of the PC board, therefore the BNC connector has two opposite 
parts respectively disposed at two opposite sides relative to the PC 
board, and less installation space above the PC board is occupied. 
According to another aspect of the present invention, the BNC connector 
comprises two elongated grooves at two opposite sides, which receives the 
two opposite lateral sides of the rectangular side opening of the PC 
board, and two wing portions at two opposite sides, which respectively 
stop at the back side of the PC board and affixed thereto by self-tapping 
screws. 
According to still another aspect of the present invention, capacitor 
elements are mounted within top through holes on the insulative body and 
connected between the ground terminal of the BNC connector and a metal 
clip to form a filter circuit.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
Referring to FIGS. 2 and 3, a BNC connector includes an insulative body 1 
made of plastics by molding. The insulative body 1 comprises an axial 
center through hole 10 through the length thereof, and a substantially 
cylindrical outer thread portion 11 disposed axially at one end. The 
center through hole 10 of the insulative body 1 receives a BNC jack 2, a 
hollow terminal shell 20, a signal terminal 21, and a ground terminal 22. 
The signal terminal 21 is inserted through the hollow terminal shell 20, 
having a curved portion 211 at one end terminated to a contact tip 210 and 
extended out of the hollow terminal shell 20 (See FIG. 5). The ground 
terminal 22 is inserted into an eccentric, axial hole 23 on the BNC jack 2 
and then affixed in position by welding, having a curved portion 221 at 
one end terminated to a contact tip 220 disposed outside the BNC jack 2. 
The BNC jack 2 comprises a radial hole 24 linked to the inner end of the 
eccentric, axial hole 23 for drawing away the residual electroplating 
solution from the BNC jack 2 after the BNC jack 2 was electroplated. When 
assembled, the signal terminal 21 and the ground terminal 22 are disposed 
in the insulative body 1 at different elevations with the curved portions 
211;221 spaced from and disposed toward each other permitting the contact 
tips 210;220 to extend outwards in the reversed directions (see FIG. 4). 
The pitch between the curved portions 211;221 is smaller than the 
thickness of the PCB (printed circuit board) 3 to be mounted. When 
mounted, the curved portions 211;221 of the signal and ground terminals 
21;22 clamp on the two opposite sides 35:34 of the PCB 3 (see FIG. 5A), 
and therefore the signal and ground terminal 21;22 are maintained in 
contact with the respective electric circuit 30 at either side of the PCB 
3. 
A metal clip 5 is mounted around the insulative body 1 by rivets 52, having 
a unitary horizontal top plate 50 and two reversed hooks 51;51'. Two 
capacitor elements 4;4' are respectively received in two top through holes 
12;12' on the insulative body 1 and stopped between the horizontal top 
plate 50 of the metal clip 5 and a top plane 26 on the BNC jack 2. When 
the outer thread portion 11 of the insulative body 1 is threaded into a 
screw hole on the metal frame (not shown), the hooks 51;51' clamp on the 
two opposite sides of the metal frame, and therefore the metal frame, the 
metal clip 5, the capacitor elements 4;4', the BNC jack 2, and the ground 
terminal 22 form a filter circuit. Further, the number of top through 
holes 12 on the insulative body 1 may be increased so as to receive more 
capacitor elements (see FIG. 6). If the filter circuit is not required, 
the metal clip 5 is not necessary, and the top through holes 12;12' and 
the outer thread portion 11 can be eliminated (see FIG. 7). 
Referring to FIG. 3 again, the insulative body 1 comprises two elongated 
grooves 13;13' disposed axially at two opposite sides along the length 
thereof, and two wing portions 14;14' disposed axially at two opposite 
sides at the bottom. The width of the elongated grooves 13;13' is 
approximately equal to the thickness of the PCB 3. The bottom planes 131 
of the elongated grooves 13;13' coincide with the top planes 140 of the 
wing portions 14;14' respectively, namely the bottom plane of either 
elongated groove 13 or 13' is the top plane of the respective wing portion 
14 or 14'. When the insulative body 1 is inserted into the opening 31 on 
the PCB 3 (see FIG. 5), the two opposite sides of the opening 31 of the 
PCB 3 engage into the elongated grooves 13;13', and the front edge 32 of 
the PCB 3 stops at the metal clip 5, and therefore the curved portions 
211;221 of the signal and ground terminals 21;22 respectively clamp on the 
two opposite sides 35;34 of the PCB 3 (see FIG. 5A) causing the contact 
tip 210;220 of the signal and ground terminals 21;22 pressed on the 
respective electric circuit 30 at either side of the PCB 3 (see FIG. 5). 
At the same time, the two wing portions 14;14' of the insulative body 1 
stop at the back side 34 of the PCB 3 and are affixed in position by 
self-tapping screws 33;33' see FIGS. 5 and 5A). A chamfered edge 130 or 
130 may be made on the front end of the elongated groove 13 or 13' for 
guiding the insulative body 1 into the opening 31 on the PCB 3. 
Because the PCB 3 engages into the elongated grooves 13;13' and is affixed 
to the wing portions 14;14', it does not oscillate and cannot be removed 
from the BNC connector. When assembled, the contact tips 210;220 of the 
signal and ground terminals 21;22 are respectively welded to the 
respective electric circuit 30 on the PCB 3 at either side. 
Referring to FIGS. 8, 8A, and 8B, therein illustrated is a BNC connector 
according to a second embodiment of the present invention. According to 
this embodiment, the contact tips 210;220 of the signal and ground 
terminals 21;22 are disposed at the same elevation, and therefore they 
contact the respective electric circuit 30;30' on the PCB at the same 
side. Therefore, this embodiment is suitable for mounting on a 
single-sided printed circuit. Of course, the pitch between the two wing 
portions 15;15' of the insulative body 1 must be made wider than that 
between the two wing portions 14;14' of the aforesaid first embodiment, so 
that the signal and ground terminals 21;22 can be disposed at the same 
elevation within the wing portions 15;15'. The width of the wing portions 
15;15'should also be relatively expanded for mounting the self-tapping 
screws 33;33'. 
The depth of the opening 31 on the PCB 3 must be made according to the type 
of the BNC connector to be matched. If the BNC connector being used 
includes the metal clip 5, the depth of the opening 31 must be equal or 
slightly smaller than the length of the elongated grooves 13;13', so that 
the front edge 32 of the PCB can stop against at the metal ring 5 when the 
BNC connector is mounted. If the BNC connector being used does not include 
the metal ring 5, the depth of the opening 31 can be longer for receiving 
the insulative body 1 and its outer thread portion 11, and therefore only 
the disconnect coupling portion 25 of the BNC jack 2 extends out of the 
opening 31 of the PCB 3. 
Referring to FIGS. 9 and 10, there shown are two alternate forms of the PCB 
for matching the BNC connectors of the first and second embodiments of the 
present invention respective. 
While only few embodiments of the present invention have been shown and 
described, it will be understood that various modifications and changes 
could be made thereunto without departing from the spirit and scope of the 
invention.