Electricity: circuit makers and breakers – Suspended-wire controlled
Patent
1984-10-04
1987-03-17
Phillips, Charles E.
Electricity: circuit makers and breakers
Suspended-wire controlled
200153LA, 200 50A, 200 6119, 200153M, H01H 1518
Patent
active
046509372
DESCRIPTION:
BRIEF SUMMARY
Apparatus of the type described are used for protecting lines and, when they are disposed in narrow modular cases, are then frequently fitted to household distribution boxes.
A protection apparatus is already known, for example from DAS No. 2618360, having the general construction mentioned above, in which the protection switch is represented by a removable fuse cartridge and in which the isolating switch is placed in an internal region of the case distant from the front face. Such an apparatus has the double disadvantage of requiring the fuse cartridge to be changed after the appearance of a short circuit and not to indicate with certainty to the user if the isolating switch has indeed fulfilled its function; in fact, transmission means which are placed between the pivoting lid and a switch pusher undergo, when the breaker contacts are welded together, buckling forces which are so high that breakage thereof may be feared as well as maintenance thereof in the closed condition whereas, from the position of the drawer, it may be thought that they are in the open position.
U.S. Pat. No. 3,030,470 also concerns a protection apparatus comprising a fixed case provided with a fixed contact and a pivoting and manually operated lid pivotably connected to the fixed case and provided with a movable contact, the case and the lid comprising magnetothermal means for opening said movable contact.
This apparatus however does not allow the operator to make sure, in a simple and efficient manner, that the contacts have really been separated during magnetic or thermal tripping or during manual opening of the drawer.
The invention proposes consequently providing a protection apparatus which has none of the above mentioned defects. According to the invention, the desired result is obtained because the movable contact of the switch is carried by the drawer so as so be separated from the fixed contact by a sufficient disconnecting distance "d" when the drawer is manually opened, the movable contact being visible from outside.
Protection apparatus are already known such as cut out switches in which one and the same mobile contact may be opened either by automatic means, or by a manual control member which also allows resetting to be effected; these apparatus do not generally have an opening distance for contacts capable of conferring thereon the disconnecting properties which are desirable, and further do not make the position of the mobile contact visible from outside the case. In one embodiment of the invention, particularly advantageous when its application relates to protection apparatus in modular cases used in household installations, an insulating screen propelled between the contacts is used for its simplicity and excellent limiting properties.
In other advantageous embodiments of the invention, a single break mobile contact will be associated with the internal electric circuit by means which confer thereon total isolation so as to avoid the danger of accidental contact therewith by an operator.
The invention, the features which it presents and the measures taken for implementing same will be better understood from the following description .
In the accompanying drawing:
FIGS. 1a, 1b, 1c show schematically the constructions of three embodiments of the invention;
FIG. 2 shows in elevation and in section through the plane PP' of FIG. 3, a first embodiment of the invention using an insulating screen and a double break contact;
FIG. 3 shows, in a view from the left hand side, the apparatus shown in FIG. 2;
FIG. 4 illustrates a view of the apparatus of FIG. 2 in a partial sectional view through the plane SS';
FIG. 5 shows, in a partial perspective view, the means used for accelerating cutting off of the arc;
FIG. 6 shows, in a partial perspective view, the elements supported by the drawer;
FIG. 7 illustrates a second embodiment of the switch according to the invention in an elevational view and in section through a median plane, where the switch is closed;
FIG. 8 shows in elevation a constructional detail of the removable coup
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patent: 1826370 (1931-10-01), Schwarz et al.
patent: 2357853 (1944-09-01), Smith
patent: 3030470 (1962-04-01), Aargreaves
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patent: 3842228 (1974-10-01), Green
Belbel Elie
Blanchard Christian
Cohen Jacques
Haury Andre
Lauraire Michel
Drucker William A.
La Telemecanique Electrique
Phillips Charles E.
Shull Linda J.
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