Electricity: circuit makers and breakers – Retarded – Clock train
Patent
1981-10-05
1984-01-03
Scott, J. R.
Electricity: circuit makers and breakers
Retarded
Clock train
74568R, 200153LB, H01H 342
Patent
active
044244231
ABSTRACT:
A switching mechanism has disc cams arranged on a shaft for actuating switches positioned beside the shaft. The cam discs are adjusted exclusively by friction contact between these cam discs and at least one supporting member. The friction surfaces are held in contact with each other under pressure from a plate spring which is positioned outside of the pair of cam discs. The tension of the plate spring is selected so as to be great enough to ensure that the cam discs do not rotate relative to the shaft unintentionally, particularly when subjected to accelerations and impacts during operation. The tension is, however, at a level which allows a sliding adjustment of the cams with the use of a tool. The tension is preferably determined by the rate of the plate spring and a fixed axial spacing in which it is confined. This spacing is set, in the preferred form, by the length of a bushing of one support member that abuts an adjacent cam unit or an equivalent stop member.
REFERENCES:
patent: 3364317 (1968-01-01), Hermle
patent: 3483344 (1969-12-01), Hermle
patent: 3839925 (1974-10-01), Ficken et al.
patent: 4238654 (1980-12-01), Hermle
patent: 4348568 (1982-09-01), Hermle
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