Telecommunications device

Abstract

A shelf-type telecommunications device has a back wired board assembly mounted on a back of a shelf unit into which a plurality of plug-in units are inserted side by side. The back wired board assembly has a main back wired board to which at least one plug-in unit is connected and a sub back wired board to which at least one external cable is connected, the outer surface of the main back wired board and the inner surface of the sub back wired board opposing each other. The main back wired board and the sub back wired board are fitted together by using a plurality of relay connectors or pin terminals so as to electrically connect the main back wired board and the sub back wired board to each other without the need for coaxial cables, thus reducing the size of the device.

What is claimed is:  
     
         1 . A telecommunications device, comprising: 
 a shelf unit;    a plurality of plug-in units inserted into the shelf unit and disposed side by side;    a main back wired board fixedly mounted to a back of the shelf unit;    a sub back wired board positioned further to the rear of the main back wired board;    a plurality of connectors for plug-in units mounted on an inner surface of the main back wired board so as to be connected to the plug-in units inserted into the shelf unit;    a plurality of connectors for external cables mounted on an outer side of the sub back wired board so as to be connected to external cables;    a plurality of relay connectors mounted on a surface of the main back wired board, the surface opposing the sub back wired board, and electrically connected to the plurality of connectors for plug-in units; and    a plurality of relay connectors mounted on a surface of the sub back wired board, the surface opposing the main back wired board, the plurality of relay connectors being electrically connected to the plurality of connectors for external cables,    wherein the plurality of relay connectors on the main back wired board and the corresponding plurality of relay connectors on the sub back wired board are fitted together, and the main back wired board and the sub back wired board are electrically connected to each other.    
     
     
         2 . The telecommunications device as claimed in  claim 1 , wherein the main back wired board and the sub back wired board form a single back wired board assembly, the plurality of relay connectors on the main back wired board and the plurality of relay connectors on the sub back wired board being fitted together and electrically connected.  
     
     
         3 . The telecommunications device as claimed in  claim 2 , wherein the back wired board assembly is assembled so that a plurality of relay connectors on the sub back wired board are initially provisionally mounted in a loose state on the sub back wired board, and the relay connectors loosely mounted on the sub back wired board are simultaneously fitted to the corresponding plurality of relay connectors on the main back wired board.  
     
     
         4 . The telecommunications device as claimed in  claim 2 , wherein the back wired board assembly is assembled so that plurality of relay connectors on the sub back wired board are initially provisionally mounted in a loose state on the sub back wired board, a plurality of pin terminals of a plurality of relay connectors are arranged on the main back wired board, a sorting plate straightens the pin terminals, and the relay connectors on the sub back wired board are fitted to corresponding relay connectors on the main back wired board so as to depress the sorting plate.  
     
     
         5 . The telecommunications device as claimed in  claim 3 , wherein the provisional mounting in a loose state of the plurality of relay connectors on the sub back wired board is accomplished by loosely fitting a plurality of terminals of the plurality of relay connectors to a plurality of holes in the sub back wired board.  
     
     
         6 . The telecommunications device as claimed in  claim 3 , wherein the provisional mounting in a loose state of the plurality of relay connectors on the sub back wired board is accomplished by loosely fitting the plurality of terminals of the plurality of relay connectors to and through a plurality of holes in the sub back wired board and holding the terminals in place by attaching tape to the tips of the terminals.  
     
     
         7 . The telecommunications device as claimed in  claim 2 , wherein the back wired board assembly is assembled so that a plurality of sub back wired board relay connectors not mounted on the sub back wired board are fitted to and connected to each of the plurality of relay connectors on the main back wired board, the sub back wired board is guided by a plurality of guide pins and brought into proximity with pin terminals protruding from back surfaces of the plurality of sub back wired board relay connectors, and a plurality of through holes in the sub back wired board and the pin terminals are fitted together.  
     
     
         8 . A telecommunications device comprising: 
 a shelf unit;    a plurality of plug-in units inserted into the shelf unit and disposed side by side;    a main back wired board fixedly mounted on a back of the shelf unit;    a sub back wired board positioned further to the rear of the main back wired board;    a plurality of plug-in unit connectors mounted on an inner surface of the main back wired board so as to be connected to the plug-in units inserted into the shelf unit;    a plurality of external cable connectors mounted on an outer surface of the sub back wired board so as to be connected to external cables; and    a plurality of pin terminals provided on the plurality of plug-in unit connectors, the pin terminals each having two press-fit portions,    wherein the pin terminals are pressed into and projected through the main back wired board toward the sub back wired board, and tip portions of the pin terminals are pressed into the sub back wire board, and the main back wired board and the sub back wired board are electrically connected to each other.    
     
     
         9 . The telecommunications device as claimed in  claim 8 , wherein the main back wired board and the sub back wired board form a single back wired board assembly, the main back wired board and the sub back wired board being electrically connected by the pressed pin terminals.  
     
     
         10 . The telecommunications device as claimed in  claim 9 , wherein the back wired board assembly is assembled so that the main back wired board and the sub back wired board are fixedly mounted so as to provide a space there between, and the plurality of plug-in unit connectors are mounted individually by pressing and inserting a plurality of pin terminals thereof through the main back wired board and then through the sub back wired board.  
     
     
         11 . The telecommunications device as claimed in  claim 9 , wherein the back wired board assembly is assembled so that the main back wired board and the sub back wired board are fixedly mounted so as to provide a space there between, the plurality of plug-in connector pin terminals being independent parts each individually pressed into and through a plug-in unit connector shroud mounted atop the main back wired board so as to project into and through the main back wired board and then into and through the sub back wired board.  
     
     
         12 . A telecommunications device comprising: 
 a shelf unit;    a plurality of plug-in units inserted into the shelf unit and disposed side by side;    a main back wired board fixedly mounted to a back of the shelf unit;    a sub back wired board positioned further to the rear of the main back wired board;    a plurality of connectors for plug-in units mounted on an inner surface of the main back wired board so as to be connected to the plug-in units inserted into the shelf unit;    a plurality of connectors for external cables mounted on an outer side of the sub back wired board so as to be connected to external cables;    a plurality of pin terminals provided on the plurality of plug-in unit connectors, tip portions of the pin terminals being inserted into and projected through the main back wired board; and    a plurality of relay connectors mounted on a surface of the sub back wired board, the surface opposing the main back wired board, the plurality of relay connectors being electrically connected to the plurality of connectors for external cables,    wherein tip portions of the plurality of plug-in unit connector pin terminals are connected to the plurality of relay connectors on the sub back wired board, and the main back wired board and the sub back wired board are electrically connected to each other.