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1. (WO1992009508) METHOD AND DEVICE FOR DETECTING HOUSEHOLD METAL OBJECTS IN HOUSEHOLD REFUSE TO BE REMOVED
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CLAIMS

1. Method for detecting, at or close to the place of use such as a house or catering establishment, household metal objects such as forks, knives, spoons and the like in household refuse to be removed by guiding the household refuse past metal detecting means and generating a warning signal in the presence of a metal object characterized in that the refuse discharge is interrupted when a warning signal is generated.
2. Method as claimed in claim 1, characterized in that the refuse is supplied to a holder and that a discharge opening for the refuse is opened only in the absence of a warning signal and when the holder is almost completely filled.
3. Device for performing a method as claimed in any of the preceding claims, comprising means for discharging refuse; metal detecting means for detecting metal objects in the refuse; and means connected thereto for generating a warning signal, characterized in that the discharge means further comprise a holder for temporary storage of the refuse, which holder is provided with a discharge opening closed off by closing members and is connected to means for detecting an almost completely filled holder and to the means for generating a warning signal in such a manner that the closing member can only be opened when the holder is almost completely filled and in the absence of a warning signal.
4. Device as claimed in claim 3, characterized in that the holder is received in a work surface.
5. Device as claimed in claim 3 or 4, character-ized in that the metal detecting means are incorporated in the closing members.
6. Device as claimed in claim 3 or 4, characterized in that the metal detecting means are incorporated in the work surface along the edge of the holder.
7. Device as claimed in any of the claims 3-6, characterized in that the holder is closed off by means of a cover.

8. Device as claimed in any of the claims 3-7, characterized in that the closing member is provided with scrapers for removing residual refuse therefrom.
9. Device as claimed in any of the claims 3-8, characterized in that the metal detecting means are formed by a modified version of the coil of a so-called "flux valve" compass.
10. Device as claimed in claim 9, characterized in that the coil is modified such that in the presence of a metal object the variation which occurs in the electrical signal of the coil is amplified.

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