Electrical switch
OwnerMemie Mei Mei Wong, Sam Yun Sum Wonginventors
Life of this patent
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Abstract
An electrical switch has a casing, fixed and moving contacts, and an internal operator turning and moving the moving contact relative to the fixed contact for switching. The casing has an opening through which an engagement part of the operator is accessible from outside for engaging a pull chain to turn the operator. The casing has a tubular part by which the switch may be mounted and through which the pull chain extends. The tubular part, being molded, has an inner surface defining a passage for the pull chain, an outer surface bearing a screw thread for engagement by a threaded nut, and, in a transverse cross-section, four recesses between the inner and outer surfaces to alleviate deformation of the screw thread due to shrinkage in molding.
Claims21
An electrical switch comprising:
- a casing having an internal volume;
- at least one fixed contact and at least one moving contact located within the internal volume of the casing;
- and
- an operator supported within the internal volume of the casing for movement that moves the at least one moving contact into contact with and out of contact with the at least one fixed contact, wherein
- the operator includes a connector for connecting an elongate pliable member to the operator,
- the casing includes first and second openings for respective insertion of first and second electrical conductors in electrical communication with the at least one fixed contact and the at least one moving contact, the first and second electrical conductors being electrically connected to each other and electrically disconnected from each other by operation of the operator,
- the casing includes a third opening comprising a tubular passage for passage of the elongate pliable member, and
- the casing includes a fourth opening exposing the connector so that the elongate pliable member can be inserted through the fourth opening and a first end of the elongate pliable member engaged with the connector of the operator, and a second end of the elongate pliable member extended through the third opening so that the second end of the elongate pliable member is accessible outside the casing, and pulling of the second end of the elongate pliable member away from the casing operates the operator and moves the moving contact, electrically connecting and disconnecting the first and second electrical conductors upon alternating operations of the operator.
An electrical switch comprising:
- a casing;
- at least one fixed contact and at least one moving contact in the casing;
- an operator supported in the casing for movement to move the moving contact into and out of contact with the fixed contact for switching;
- and
- an elongate pliable member associated with the operator and operating the operator upon being pulled, wherein
- the casing has a protruding tubular part by which the electrical switch may be mounted and through which the pliable member extends from the casing for pulling, and
- the tubular part is molded, has an inner surface defining a passage for the pliable member, an outer surface bearing a screw thread for engagement by a threaded nut member, and, in a transverse cross-section, at least one void space between the inner surface and the outer surface, alleviating deformation of the screw thread due to shrinkage of the tubular part.
Dependencies are inferred from the claim text.