Thermal actuator
First Claim
1. A thermal actuator, comprising:
- a thermal detector which comprises a first contact member made of electrical conducting material, a second contact member made of thermostatic metal and an insulating connector connected between a connecting end of said second contact member and said first contact member, wherein said second contact member which is normally remained not in contact with said first contact member has a contact end which would bend towards and press against said first contact member when said temperature around said thermal detector reaches a predetermined temperature;
an actuator unit which comprises an actuating piece made of thermostatic metal strip, a conducting terminal piece connected to said actuating piece, an insulating sleeve covering a portion of said actuating piece, and an electrical heat wire wrapping around said insulating sleeve which has one end connected to said actuating piece; and
a connecting circuit which comprises a first conducting wire connected between said first contact member of said thermal detector and said conducting terminal piece of said actuator unit, a first terminal, a second conducting wire connected between said second contact member of said thermal detector and said first terminal, a second terminal electrically connected with another end of said electrical heat wire.
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Accused Products
Abstract
A thermal actuator includes a thermal detector, an actuator unit and a connecting circuit for electrically connecting the thermal detector and the actuator unit. When a second contact member is normally remained uncontact with a first contact member of the thermal detector, the thermal actuator is an open circuit and not function. However, when the second contact member bends to contact with the first contact member due to an overheated or over-cold temperature around the thermal detector, the thermal actuator is in a close circuit and the electric current flows to an actuator unit thereof. A heat wire wrapped around an actuating piece of the actuator unit generates heat to increase the temperature around the actuating piece. When the temperature around the actuating piece increases to a predetermined extent, the actuating piece bends so as to provide an actuating action. If the actuator unit is installed close to a switch or a breaker, the actuating action of the actuating piece can activate the switch to turn off or the jumper of the breaker to cut the electric supply.
26 Citations
14 Claims
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1. A thermal actuator, comprising:
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a thermal detector which comprises a first contact member made of electrical conducting material, a second contact member made of thermostatic metal and an insulating connector connected between a connecting end of said second contact member and said first contact member, wherein said second contact member which is normally remained not in contact with said first contact member has a contact end which would bend towards and press against said first contact member when said temperature around said thermal detector reaches a predetermined temperature; an actuator unit which comprises an actuating piece made of thermostatic metal strip, a conducting terminal piece connected to said actuating piece, an insulating sleeve covering a portion of said actuating piece, and an electrical heat wire wrapping around said insulating sleeve which has one end connected to said actuating piece; and a connecting circuit which comprises a first conducting wire connected between said first contact member of said thermal detector and said conducting terminal piece of said actuator unit, a first terminal, a second conducting wire connected between said second contact member of said thermal detector and said first terminal, a second terminal electrically connected with another end of said electrical heat wire. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification