Electrical connectors – Preformed panel circuit arrangement – e.g. – pcb – icm – dip,... – With provision to conduct electricity from panel circuit to...
Reexamination Certificate
2000-07-20
2001-05-29
Ta, Tho D. (Department: 2833)
Electrical connectors
Preformed panel circuit arrangement, e.g., pcb, icm, dip,...
With provision to conduct electricity from panel circuit to...
C439S045000
Reexamination Certificate
active
06238220
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a main layout rack structure for communication exchange, and more particularly to a layout rack structure including two cooperative PC boards to reduce the volume of the rack and provide connections for more telephones. Also, the rack structure simplifies telephone line connections.
The existing main layout rack structure used in a telephone exchange is composed of several terminal boards
10
sequentially overlaid on each other as shown in FIG.
1
. The upper side of the terminal board
10
is formed with ten pairs of incoming line engaging troughs
11
. The lower side of the terminal board
10
is formed with ten pairs of opposite outgoing line engaging troughs
12
. The incoming line engaging troughs
11
serve to engage with lines connected to the exchange, while the outgoing line engaging troughs
12
serve to engage with the lines connected to the telephones. Each telephone corresponds to a pair of incoming line engaging troughs
11
and a pair of outgoing line engaging troughs
12
. Therefore, each terminal board
10
at most provides connections for ten telephones. In the case of more telephones, a certain number of terminal boards
10
must be added.
A main layout rack structure employing semiconductor techniques has been developed to replace the above structure. Such improved layout rack has smaller volume. However, the expense for such semiconductor techniques is over twenty times the cost for the conventional layout rack. Therefore, rack structures employing semiconductor techniques are not widely used.
The above conventional layout rack structure has the following shortcomings:
1. Each terminal board
10
is applicable to ten lines (that is, ten telephones). Therefore, in the case of one hundred telephones, ten terminal boards will be necessary for providing connections for the one hundred telephones. As a result, the volume will increase ten times and much room will be occupied.
2. When connecting each telephone, one set of two lines must be connected to one set of incoming line engaging troughs
11
of the terminal board
10
from the exchange and then one set of two lines must be engaged with the corresponding outgoing line engaging troughs
12
and connected to the telephone. Such procedure is troublesome and inconvenient and the more telephones there are, the more complicated the lines are.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide an improved communication main layout rack structure in which two thin panel-like PC boards are assembled into one unit for connection of numerous telephones. When each other unit is added, more telephones can be connected. The volume of the layout rack is small and will not occupy much room.
It is a further object of the present invention to provide the above main layout rack structure in which the connection is simplified in such a manner connectors are directly inserted into and connected with the exchange and the telephones. Therefore, there is no need to lay tens or hundreds of random lines in the box of the main layout rack. As a result, the appearance is tidy and it is easy to install and maintain the unit.
The present invention can be best understood through the following description and accompanying drawings wherein:
REFERENCES:
patent: 3175179 (1965-03-01), Trump
patent: 4778393 (1988-10-01), Hosogai et al.
patent: 5598627 (1997-02-01), Saka et al.
patent: 6139360 (2000-10-01), Hayashi et al.
Bacon & Thomas PLLC
Ching Feng /Blinds Ind. Co., Ltd.
Ta Tho D.
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