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Fuel Cells

Electric-slide-switch-having-sliding-contact-with-cleaning-action

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Electric slide switch having sliding contact with cleaning action

Details

Inventors: Godfrey, Nelson F. J.;
Assignee: ERG Industrial Corporation Limited (EN)
Primary Examiner: Scott; James R.
Assistant Examiner:
Attorney, Agent or Firm: Beveridge, DeGrandi, Kline & Lunsford

Miniature electrical switches having a sliding cleaning action, and utilizing a U-shaped bridging element with a detent projection for engagement in between and in contact with adjacent terminals and simultaneously providing electrical connection and detent action. The bridging element may have a curved bottom; it tilts backwardly as the bottom slides forwardly over a terminal, and subsequently is tilted forwardly by the recess trailing wall. An alternative element has a rounded off leading corner, rocks over a terminal, engages the adjacent terminal, and subsequently is tilted backwardly. The limiting position is unstable and the "on" position provides a cleaner interface.

DETAILED DESCRIPTION In FIG.
1 a miniature slide-action switch 10 having a simple "on-off" action comprises a housing formed of a base portion 11, which constitutes a wall of the housing in accordance with the present invention, and a cover portion 12, a pair of spaced-apart fixed terminals 13 and 14 secured in the base portion 11 and having upturned ends 15 and 16 for engagement with a bridging element 17 contained within a recess 18 in the lower surface of a switch operating member, or slider, 19 disposed within the switch.
It will be understood that the terminals 13, 14 are upstanding for the purposes of the present invention.
The terminals have leadouts projecting downwardly through the base portion 11.
The leadouts are on 0.
3 in centres.
For ease of assembly, the upper portion 12a of the cover and the base portion 11 are together constituted by a single unit insertable into the remainder of the cover 12.
The slider 19 has an upwardly extending head portion 20 protruding through an elongate aperture 21 in the top of the cover portion 12.
To assist identification of the desired movement for a given "on" or "off" condition of the switch, the head portion 20 has projecting portions 22 and 23 of which portion 22 is pointed and portion 23 has a flat, blunt free end.
The portions 22 and 23 are integrally moulded with the remainder of slider 19 from a coloured plastics material.
The cover portion 12 is formed of a plastics material having a contrasting colour to that of the slider 19.
The switch is rendered "on" when the slider is pushed in the direction of the pointed portion 22 (see FIG.
5), and the pointed portion 22 is then seen in contrast to the underlying top surface of the cover portion 12.
This indicates that the switch is in the "on" condition.
To put the switch into an "off" condition, the slider is moved in the opposite direction, i.
e.
in the direction of the blunt portion 23.
The "off" condition is shown in FIG.
1 where substantially the whole of the pointed portion 22 lies over a part of the elongate aperture 21 and is seen, not against a contrasting colour as in FIG

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