Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Automatic circuit-interrupting devices
Patent
1992-10-15
1994-09-13
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Automatic circuit-interrupting devices
335185, 335190, H01H 7300
Patent
active
053472489
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a protective switching device for difference-current and undervoltage tripping of the built-in and mobile type. The device includes a contact arrangement that can be switched on mechanically by hand and triggered electromagnetically.
2. The Prior Art
It is known that such protective switching devices are connected as series devices within consumer products via one or several sensor line(s) with additional electrodes. This requires a special connection cable between the two parts and leads to triggering only if current leakage flows through the sensor line(s). In most cases, the devices do not have undervoltage and free triggering, and do not provide for testing their functionality.
However, a leakage-current protective switching device embodied as a connection plug for an electrical consumer product is known from EP 0 189 493 B1, which device contains a switch contact arrangement that has to be actuated all-pole by hand by means of a push-button via a switching mechanism, and which can be tripped electromagnetically by an electronic difference-current and low-voltage monitoring device. In addition, the device has a tester for controlling its functionality.
The known series device, however, makes use of a relatively complicated switch-on and tripping mechanism and, accordingly, has to be manufactured and installed in a costly way. In addition, the constructional structure of the device requires a special casing.
SUMMARY OF THE INVENTION
The invention is based on the problem of arranging such a protective switching device in individual assemblies and assembling it in a confined space to an efficient built-in installation unit.
For resolving said problem, the switching mechanism of a protective switching device is based on a coupling member, that is adjustable in a defined way on the operator's side, between a fixed stop of the casing and a pressure-spring loaded plunger-type magnet of the electromagnetic tripping element acting on a contact support. The tripping element is adjustable pressure-spring loaded in the opposite direction, through an idle-stroke or release profile corresponding with said contact support.
With the embodiment according to the invention of the switching mechanism--which has to be actuated manually and electromagnetically--for the electrical contact arrangement of the protective switching device, one obtains in a progressive way an assembly of individual parts that is independent per se and fully efficient. The individual parts can be associated with other parts of the device, which are combined in assemblies in the same way, within close limits, so as to be able to install the assemblies in a small casing, or in the respective empty space within any desired electrical appliance.
According to a further embodiment, the coupling member is a two-arm rocking lever supported for swinging around a shaft in the extensions of the control handle, which extensions support themselves against a screw pressure spring on the casing. The coupling member is, in the direction of actuation, provided with a stop bow elastically molded onto it, and, in the opposite direction, has above the point of rotary support a recess matching the cross section of the contact support. The switch-on and tripping mechanics are combined with the contact support to one structural part, of which the casing supports the electromagnetic plunger-type magnet system laterally beneath the projectingly active lever arm of the coupling member.
Concerning the electronic system of the protective switching device, the latter is arranged together with the fixed contact pieces of the switching track, an auxiliary contact arrangement for the power supply of the device, and the test key contacts arranged on a printed circuit board. The circuit board, as a further constructional part, is assembled with the afore-specified switch-on and tripping mechanics, and can be joined by soldering with the connections of the exciting winding of the electromagnetic plun
REFERENCES:
patent: 4010432 (1977-03-01), Klein et al.
patent: 4209762 (1980-06-01), Samborski et al.
patent: 4774484 (1988-09-01), Lehman et al.
patent: 5148344 (1992-09-01), Rao et al.
Donovan Lincoln
Heinrich Kopp AG
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