(19)
(11) EP 0 072 693 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
09.03.1983 Bulletin 1983/10

(43) Date of publication A2:
23.02.1983 Bulletin 1983/08

(21) Application number: 82304314

(22) Date of filing: 16.08.1982
(84) Designated Contracting States:
BE CH DE FR GB IT LI SE

(30) Priority: 14.08.1981 GB 8124882

(71) Applicant: MORGANITE ELECTRICAL CARBON LIMITED
 ()

(72) Inventor:
  • Cheesmore, Royston Amos
     ()

   


(54) Electrical brushes


(57) Disclosed herein is an electrical brush (1) having a brush wear sensor (9) in the form of a loop (10, 11, 13) of insulated electrical conductor lying in a bore (5, 6) leading from an upper surface of the brush to a depth (d) equivalent to the point at which brush wear is to be sensed, the sensor loop passing around a fixed point of or in the brush at the bottom of the bore to anchor the sensor loop in the brush.






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