Title:
【考案の名称】オ―トトリッピング機能を有する押しボタン式スイッチ
Document Type and Number:
Japanese Patent JP3066486
Kind Code:
U
Abstract:
This invention is related to an auto tripping key switch, comprising a switch housing being formed with at least one guide groove and one slideway at an inner side thereof; a first contact plate and a second contact plate that are fastened to the switch housing, the first contact plate being provided with a first contact and the second contact being connected to a deformable bi-metallic strip provided with a second contact that opposes to and is spaced from the first contact at an appropriate distance. This invention further comprises a key that is provided with a first protrusion engaging the guide groove within the switch housing such that the key is only slidable along the guide groove, the key having an inner serrate edge; and a cylindrical insulative housing that is slidable in the switch housing and has an end being formed with a serrate edge matching the serrate edge of the key so as to subject rotation of the cylindrical insulative housing when the key is being pushed. The cylindrical insulative housing is provided with at least a second protrusion having an end being formed with at least a slit. The slit has a closed end that is formed with a beveled face. This invention may further comprise a resilient member that biases the cylindrical insulative housing towards the key in relation of the switch housing. The bi-metallic strip is resiliently pushed towards the cylindrical insulative housing. While encountering current overload, deformation of the bi-metallic strip of the key switch of this invention, as a result of temperature increase, will automatically trip the key switch to form a closed circuit so as to ensure electrical safety.
Inventors:
Tsun-mu Yu
Application Number:
JP600699U
Publication Date:
February 25, 2000
Filing Date:
August 09, 1999
Export Citation:
Assignee:
Tsun-mu Yu
International Classes:
H01H13/58; H01H27/06; H01H73/30; H01H37/52; (IPC1-7): H01H73/30; H01H37/52
Attorney, Agent or Firm:
Shusaku Yamamoto