Electrical connectors – Contact comprising cutter – Insulation cutter
Reexamination Certificate
1999-06-08
2001-07-24
Sircus, Brian (Department: 2839)
Electrical connectors
Contact comprising cutter
Insulation cutter
C439S752000
Reexamination Certificate
active
06264497
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a multipolar insulator displacement type waterproof connector which prevents an inconvenience that an insulated electric wire is in a state of non pressure-contact to an insulator displacing portion of a terminal from occurring and has excellent reliability and assemble efficiency.
2. Description of Relevant Art
This kind of an insulator displacement type water proof connector is disclosed in Japanese Patent Application Laid-open No. 5-152028, for example. The waterproof connector is composed of a waterproof plug (rubber plug) which has a plurality of electric wire through holes through which electric wires (insulated electric wires) pass, an inner housing which accommodates a plurality of terminals which are pressure contacted with the electric wires, an outer housing which accommodated the inner housing therein and is fitted to the waterproof plug in one opening portion thereof.
In case of assembling the insulator displacement type waterproof connector, the electric wires are passed through the respective electric wire through holes first. The respective electric wires are pressure contacted to a pair of insulator displacing blades of the terminals which is accommodated in respective terminal accommodating chamber of the inner housing. Therefore, the insulator displacement type waterproof connector is assembled, and a mated connector is to be fitted in and detached from other opening of the outer housing.
However, in the conventional insulator displacement type water-proof connector, in case of assembling the insulator displacement type waterproof connector, there are passed through the step of passing the electric wires through the waterproof plug, the step of pressure contacting the electric wires to the terminal, and the step of fitting the inner housing in the outer housing. Thus assembling steps of the insulator displacement type waterproof connector are complicated, and assemble efficiency is deteriorated. Further, when assembling the insulator displacement type waterproof connector, the step of pressure contacting is skipped over. If the inner housing is fitted in the outer housing in a state of non pressure-contact that the insulated electric wires are not pressure contacted to the terminals, the electric wires in the state of non pressure-contact to the terminals can not be detected. Further, the terminals are accommodated only in terminal accommodating chamber of the inner housing and there is not provided a engaging structure. Thus, reliability is lacked.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a multipolar insulator displacement type waterproof connector in which an insulated electric wire in a state of non pressure-contact is detected easily and which improves reliability and assemble efficiency.
From a first aspect of the invention, there is provided an insulator displacement type waterproof connector for an insulated electric wire. The connector comprises a terminal having an insulator displacing portion; a first housing which surrounds the terminal and has a first through hole opposite to the insulator displacing portion of the terminal; and a pressure body which is inserted in the first through hole of the first housing in a temporarily retained position and is movable from the temporarily retained position to a regularly retained position to pressure contact the insulated electric wire with the insulator displacing portion.
Preferably, the connector further comprises a second housing which is fitted in the first housing, accommodates the terminal, and has a second through hole opposite to the insulator displacing portion of the terminal.
Preferably, the connector further comprises a spacer which is interposed between the first housing and the second housing, and has a third through hole opposite to the insulator displacing portion of the terminal.
From a second aspect of the invention, there is provided a method of manufacturing an insulator displacement type waterproof connector for an insulated electrical wire. The method comprises the steps of: providing a first housing which has a first through hole; providing a terminal which has an insulator displacing portion; positioning the insulator displacing portion opposite to the first through hole; inserting a pressure body in the first through hole in a temporarily retained position where the insulated electric wire is held between the insulator displacing portion and the pressure body; and moving the pressure body to a regularly retained position, and thereby pressure contacting the insulated electric wire with the insulator displacing portion.
In the above-mentioned invention, the term “pressure contact” means that an insulator of the insulated electric wire is displaced by the insulator displacing portion of the terminal and a conductor of the insulated electric wire is contacted with the insulator displacing portion.
In the insulator displacement type waterproof connector, the insulated electric wire is arranged above the insulator displacing portion of the terminal which is accommodated in the first housing, the second housing and the spacer assembled together previously. The insulated electric wire is pressure contacted to the insulator displacing portion of the terminal by movement of the pressure body. Thus, assemble steps of the insulator displacement type waterproof connector are simplified and assemble efficiency is improved. The terminal is doubly engaged with the spacer and pressure body, and reliability is improved. Further, whether the insulated electric wire has already been pressures contacted or has not yet been is easily detected by movement amount of the pressure body, and thus the inconvenience that the insulated electric wire is in the state of non pressure-contact is prevented from occurring.
REFERENCES:
patent: 3868161 (1975-02-01), Frantz
patent: 4435034 (1984-03-01), Aujla et al.
patent: 4445748 (1984-05-01), Evans
patent: 4978314 (1990-12-01), Maejima
patent: 5562478 (1996-10-01), Yamamoto
patent: 5931699 (1999-08-01), Saito
patent: 32 28 657 (1984-02-01), None
patent: 93 10 650 U (1993-08-01), None
patent: 2549302 (1985-01-01), None
patent: 2229588 (1990-09-01), None
patent: 3-81272 (1991-12-01), None
patent: 5-152028 (1993-06-01), None
patent: 5-152028 (1993-09-01), None
European Search Report, Dec. 9, 1999.
Fukuda Masaru
Murakami Takao
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Hyeon Hae Moon
Sircus Brian
Yazaki -Corporation
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