Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – Fusible element actuated
Reexamination Certificate
1996-09-10
2001-06-26
Gandhi, Jayprakash N. (Department: 2841)
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
Fusible element actuated
C337S197000, C337S208000, C337S215000, C439S620180
Reexamination Certificate
active
06252491
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a plug for an appliance and having a fuse, including an insulation body which supports contact pins which are insulated against each other and extend from the outer side to the inner side through the insulation body and are connected at the inner side in an electrically conducting manner to respective inner connectors.
2. Description of the Prior Art
Plugs for appliances which have a fuse are generally known. The fuse is accessible at the side of the plug which is located at the outer side of the appliance when in use, in other words, from the outside. Generally, the fuse is designed as a fuse supporting member having a removable supporting member for the fuse wire insert and an exchangeable fuse wire insert. The production necessitates high expenditures.
When the fuse wire insert at such a plug for an appliance has interrupted the electric current the non-skilled person can simply exchange the fuse wire insert from the outside, thus from the outside of the appliance.
It is now increasingly possible to protect an appliance against electrical misfunctions, which have causes outside of the appliance electronically i.e. without fuses.
In such a case the fuse wire insert acts as last protection when all other protection circuits in the appliance fail. Therefore, when the fuse wire insert has been interrupted a defect inside of the appliance is present. The defect must, therefore, be repaired before exchanging the fuse wire insert. As a rule, the non-skilled person cannot perform such a task. Therefore, it does not make sense or even may be dangerous to leave the exchanging of the fuse wire insert up to the non-skilled person. In such cases where grave risks could be encountered the fuse for such reason has been mounted inside of the appliance in such a manner that practically only the person skilled in the art could exchange the fuse wire insert. Such fuses would have to be mounted and connected seperately which in turn gives rise to a high expenditure.
SUMMARY OF THE INVENTION
It is, therefore, a general object of the invention to provide a structure which confines the exchanging of the fuse wire insert to a person skilled in the art without giving rise to the high expenditures associated with the known fuses.
A further object is to provide a plug for an appliance having a fuse, located at the inner side, which in use is enclosed in a housing of the appliance and thus is not accessible from the outer side at least one electric fuse between a respective contact pin and a respective inner connector.
Such as is the case with a known fuse, which as a separate structural member is mounted separately at the inside of the appliance and is connected separately, the exchanging of the fuse wire insert only from the inside when the appliance is opened can only be done by a person skilled in the art in case of the present invention. But the expenditure for a separate structural member which must be mounted and connected separately is no longer present. It is, additionally, also possible to use very simple holding elements for the fuse because they obviously are protected inside of the appliance against the access by a person not skilled in the art which leads to a large saving on expenditures in comparison with commonly known plugs for appliances having a fuse. Due to the protected position of the fuse inside of the appliance it is not necessary to foresee a protection against contact by a person in form of specific sealing structures at the fuse holder.
Advantageously, however, it is possible to cover the parts which are live, carry current against the inside by a simple inner cover.
The producing of the inventive appliance plug is quite simple, and it also can be mounted and connected quite easily.
Preferably only one insulating member which receives the parts of the plug and the fuse is present.
Preferably, the fuse can be foreseen between the pin of the plug which projects to the outside and the inner connector of the plug. It is for instance possible to foresee for this case a simple clip fuse holder with a fuse wire insert. Even smallest fuses such as micro-fuses and surface mounted device (SDM) fuses can be used advantageously.
REFERENCES:
patent: 4959025 (1990-09-01), Eberhard et al.
Breiner & Breiner
Gandhi Jayprakash N.
Schurter AG
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