Electrical connectors – Contact comprising cutter – Insulation cutter
Reexamination Certificate
1999-11-26
2001-03-13
Donovan, Lincoln (Department: 2832)
Electrical connectors
Contact comprising cutter
Insulation cutter
C338S162000, C338S163000, C338S160000
Reexamination Certificate
active
06200156
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a lead wire connection terminal fitment and a high-voltage variable resistor unit with a relay terminal fitment, and more particularly to a high-voltage variable resistor unit such as a focus pack, a double focus or the like suitable for use for adjusting a focus voltage of a CRT and a soldering-less lead wire connection terminal fitment used for such a high-voltage variable resistor unit.
There has been conventionally known a soldering-less lead wire connection terminal fitment which is formed by subjecting a metal plate to machining and in which a lead wire is press-fitted, as disclosed in U.S. Pat. Nos. 5,475,358 and 5,517,171. A soldering-less lead wire connection terminal fitment disclosed in each of the U.S. patents is so constructed that a pair of inner surfaces which are arranged so as to surround or define a lead wire press fit groove and between which a lead wire is press-fitted are formed thereon with a plurality of indentations adapted to bite into an outer periphery of the lead wire, resulting in ensuring reliable mounting of the lead wire in the lead wire connection terminal.
Press fitting of a plurality of lead wires in the single lead wire press fit groove of the lead wire connection terminal fitment constructed as described above is carried out by deviating the lead wires from each other in a vertical direction. However, when press fitting of a plurality of lead wires different in diameter in the single lead wire press fit groove is to be carried out, determination of a width of the press fit groove on the basis of any specific one of the lead wires causes press fitting of lead wires larger in diameter than the specific lead wire in the groove to be hard. Also, it fails to permit the indentations to satisfactorily bite into lead wires larger in diameter than the specific one. In addition, when a plurality of lead wires having the same diameter are to be press-fitted in the groove, lead wires firstly fitted in the groove are increased in contact with the indentations of the groove, to thereby be excessively shaved or damaged by the indentations, resulting in being apt to be broken or cut.
SUMMARY OF THE INVENTION
The present invention has been made in view of the foregoing disadvantage of the prior art.
Accordingly, it is an object of the present invention to provide a lead wire connection terminal fitment which is capable of facilitating press fitting of lead wires in a lead wire press fit groove of the terminal fitment.
It is another object of the present invention to provide a high-voltage variable resistor unit equipped with a lead wire connection terminal fitment which is capable of facilitating press fitting of lead wires in a lead wire press fit groove of the terminal fitment.
It is a further object of the present invention to provide a high-voltage variable resistor unit equipped with a lead wire terminal fitment which is capable of permitting lead wires different in diameter to be readily and reliably press-fitted therein.
It is still another object of the present invention to provide a high-voltage variable resistor unit which is capable of facilitating connection between a relay terminal fitment and lead wires.
In accordance with the present invention, a lead wire connection terminal fitment is provided. The lead wire connection terminal fitment includes a metal plate formed with a lead wire press fit groove by machining in which lead wires are press-fitted. The lead wire press fit groove includes a lead wire insertion port and is arranged so as be open on both sides of the metal plate in a thickness direction thereof and extend in a direction away from the lead wire insertion port. The metal plate has a pair of inner surfaces defining the lead wire press fit groove therebetween. The inner surfaces of the metal plate are formed thereon with a plurality of projections and recesses engaged with an outer periphery of the lead wires. The projections are arranged so as to form a plurality of pairs in such a manner that each pair of projections are opposite to each other. The projections are arranged so that a space defined between the projections opposite to each other is stepwise reduced in width as a distance of the lead wire press fit groove from the lead wire insertion hole is increased.
Press fitting of a plurality of lead wires different in diameter in the lead wire press fit groove is carried out by firstly press-fitting lead wires reduced in diameter in the lead wire press fit groove and then press-fitting lead wires increased in diameter therein. This permits lead wires reduced in diameter to be arranged in a portion of the space of the lead wire press fit groove which is reduced in width and lead wires of an increased diameter to be arranged in a portion thereof which is increased in width. Thus, the present invention permit the lead wires different in diameter to be readily press-fitted in the lead wire fit groove.
Also, the above-described formation of the space in the lead wire fit groove permits press fitting of a plurality of lead wires having the same diameter in the groove to be carried out while preventing an outer periphery of lead wires firstly fitted therein from being damaged by the projections positioned near the lead wire insertion port, resulting in keeping the lead wires from being cut or broken.
The lead wire connection terminal fitment of the present invention may be used for a variety of electric equipments and electric components. For example, it may be used as a relay terminal fitment for a high-voltage variable resistor unit. A high-voltage variable resistor unit equipped with such a relay terminal fitment includes a casing made of an insulating resin material. The casing is formed on one side thereof with an opening and has a variable resistance circuit board receiving chamber, a fixed resistance board receiving chamber and a capacitor receiving chamber defined therein. The unit also includes a variable resistance circuit board received in the variable resistance circuit board receiving chamber while keeping a rear surface thereof facing the opening and provided on a front surface thereof with a variable resistance circuit pattern including an input electrode, a ground electrode and at least one output electrode. The unit further includes an input terminal fitment arranged on a rear surface of the variable resistance circuit board and electrically connected to the input electrode, a fixed resistance circuit board received in the fixed resistance circuit board receiving chamber and formed on a front surface thereof with a fixed resistance circuit pattern including first and second connection electrodes to which first and second fixed resistance circuit board lead wires are respectively connected, a relay terminal fitment arranged in any one of the fixed resistance circuit board receiving chamber and capacitor receiving chamber or in a boundary region between the fixed resistance circuit board receiving chamber and the capacitor receiving chamber and including a connection terminal section extending toward the opening of the casing and a lead wire connection section to which the lead wires are connected, and a capacitor including first and second capacitor lead wires and received in the capacitor receiving chamber. The first fixed resistance circuit board lead wire and second fixed resistance circuit board lead wire of the fixed resistance circuit board are connected to the input terminal fitment and the lead wire connection section of the relay terminal fitment, respectively. The first capacitor lead wire and second capacitor lead wire of the capacitor are connected to the lead wire connection section of the relay terminal fitment and a terminal fitment fixed in the casing. The relay terminal fitment is made by subjecting a metal plate to machining. The lead wire connection section is formed with a lead wire press fit groove in which the second fixed resistance circuit board lead wire and first capacitor lead wire are press-fitted. The lead wire press fit groove include
Daimon Kazufumi
Hiraki Kenichi
Ohta Tsuyoshi
Donovan Lincoln
Hokuriku Electric Industry Co., Ltd.
Lee Kyung S.
Rankin, Hill Porter & Clark LLP
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