Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Automatic circuit-interrupting devices
Patent
1998-07-21
1999-11-16
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Automatic circuit-interrupting devices
335 15, 335 16, 335132, 335172, 335177, 335178, 335129, 335180, 335182, 335183, 335184, 335194, 335195, 335266, H01H 7500
Patent
active
059865288
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an electrical switching device having a moving contact element with a pair of moving contacts on the moving contact element, a pair of stationary contact elements to which the stationary contacts are individually attached, a first electromagnetic drive apparatus having a stationary iron core, a moving iron core and a coil which is electrically connected in series with one of the stationary contacts, and a second electromagnetic drive apparatus which comprises a yoke, an armature and a winding, for switching on and off the load current via a transmission member.
BACKGROUND INFORMATION
German Patent Application No. 41 04 533 describes a conventional switching device. Here, an n-release is provided as an auxiliary magnet system to whose armature a plunger is attached, which plunger is used to strike the contacts when overcurrents occur. This is intended to prevent the contacts from welding as a consequence of overcurrents and, when such overcurrents occur, the contacts are disconnected to a greater or lesser extent, depending on the current, with arcs being formed. The plunger is guided in the cylindrical cavity of a contact link mounting which is of tubular design and can be operated via a lever by a main magnet system in order to switch the load current on and off. In this case, the auxiliary magnet system is located underneath the contact arrangement in such a manner that the line of the plunger axis is aligned with the longitudinal center axis of the contact link mounting. The main magnet system is arranged alongside the auxiliary magnet system, i.e., laterally offset from the longitudinal center axis of the contact link mounting.
German Patent Application No: 28 48 287 describes a solenoid switch in which the contacts are opened rapidly in order to switch the load circuit on and off when overcurrents occur. The solenoid switch is an apparatus that is sensitive to overcurrents. The solenoid switch includes a winding through which the load current flows. The solenoid switch further includes a magnet core which is provided with a striking pin. An electromagnet switches the load current via the contacts on and off, for which purpose its armature is coupled via a magnetic force store to a transmission device which can move longitudinally, in consequence carries out a movement in the longitudinal direction when the electromagnet is excited and, in the process, lifts the moving contacts, which are attached to a moving contact link of the stationary contacts. When overcurrents occur, the armature of the solenoid switch acts on the spring force store in such a manner that the latter accelerates the transmission device suddenly and pulls the contacts apart in order to avoid welding. The force from the electromagnet can also be transmitted by a push rod which is guided in a transmission device operated by the solenoid switch.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an improved switching device within which welding of the contacts is precluded by avoiding arcs that are dependent on overcurrents.
The object is achieved according to the present invention in that the transmission member is designed as a contact link mounting with a window in which the moving contact element is held, in that the contact link mounting is coupled to the armature without any levers being interposed, in that the moving iron core of the first drive apparatus is attached to the contact link mounting, and in that the moving iron core is acted on by a force which is proportional to the load current and holds the contacts via the contact link mounting.
An advantageous development of the present invention results if the first drive apparatus and the second drive apparatus are arranged coaxially with respect to one another and have a common line of force action which is aligned with the axis of symmetry of the contact link mounting. This has the advantage that only longitudinal forces act and the forces can be completely brought into effect while minim
REFERENCES:
patent: 3465270 (1969-09-01), Schattler
patent: 3921109 (1975-11-01), Hodgson
patent: 3991290 (1976-11-01), Bayles et al.
patent: 4292611 (1981-09-01), Bresson et al.
patent: 4307358 (1981-12-01), Haury et al.
patent: 4491812 (1985-01-01), Happach
patent: 5163175 (1992-11-01), Mori et al.
Koppmann Bardo
Meier Markus
Barrera Raymond
Donovan Lincoln
Siemens Aktiengesellschaft
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