Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1978-11-13
1980-06-03
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
200 6109, 210 85, G08B 2100
Patent
active
042059046
ABSTRACT:
A device for indicating the presence of electrically conducting particles, such as metal detritus, in a liquid such as hydraulic oil passing through a filter in which a gap is provided adjacent the filter into which metal particles are swept by the liquid flow to form a conducting bridge in an electrical circuit. In a preferred embodiment, an annular gap closed to through flow is provided between an insulated metal ring around a filter element and the wall of the flow passage surrounding the filter, and the ring and the wall are connected to an electrical circuit for actuating a warning light or audible alarm when the gap is bridged.
REFERENCES:
patent: 3186549 (1965-06-01), Botstiber
patent: 3553672 (1968-02-01), Smith
Fischer Karl-Heinz
Perkert Rudolf
Skubich Otto
Caldwell Sr. John W.
Massey-Ferguson Services N.V.
Myer Daniel
Nolte William R.
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