A RUBBER BUSH FOR CONTACT-BREAKER ARMS.
Page 74
If you've noticed an error in this article please click here to report it so we can fix it.
A Resume of Recently Published Patent Specifications.
IF we may judge from the number of letters we receive from drivers and mechanics complaining of the defects of the present construction of contactbreaker arm, we are convinced that some improvement is urgently needed. The failures of which we hear are due to (1) the swelling of the fibre bush surrounding the pin on which the lever swings, which causes the arm to stick in such a position that the spring is no longer able to bring the points into contact, and (2) the frequent breakage of the spring controlling the lever.
The present invention appears to be an effort to overcome both these very annoying defects, and is described in the specification of Leon Thiry, of Huy, Belgium; No. 270,693. A rubber bosh is compressed and forced into the space between the hole on the arm and its pin in such a way that no rubbing between the metal and the rubber takes place, but the molecular deformation of the rubber is relied upon to permit the necessary movement. The bush in the arm is set in such a position that it normally brings the points into contact, so doing the double duty of a bearing and spring.