An overload protection switch with a reverse restart switching structure, comprising:
- a housing having a lampshade disposed at an upper end thereof, and a first terminal and a second terminal arranged at a bottom section;
- the first terminal is connected to a binary alloy conductive plate, the binary alloy conductive plate has a spring leaf with a first connecting point, and the second terminal has a second connecting point on a surface of an upper section thereof disposed in correspondence with the first connecting point;
- a moving rod linking a pivot hole at a bottom of the lampshade with one end and the binary alloy conductive plate with an opposing end thereof for the first connecting point to contact the second connecting point responsive to the pivot hole being pushed inward, to thereby achieve a conducting state (ON), and the first connecting point disconnecting from the second connecting point responsive to occurrence of a current overload wherein the binary alloy conductive plate deforms due to high temperature, and thereby achieving a nonconducting state (OFF), to thereby form an overcurrent protection switch;
- wherein:
- the moving rod includes:
- a horizontal rod arranged at the upper section of the second terminal to pass into the pivot hole of the lampshade, a first brake plate arranged at a middle section of the moving rod and extending inwardly therefrom, a second brake plate extending inwardly from the middle section of the moving rod and being spaced below the first brake plate extending angularly with respect thereto, whereby the second brake plate forms a forward guiding surface above the second brake plate and a backward guiding surface below the second brake plate to form a dislocation area between the first brake plate and the forward guiding surface of the second brake plate, a third brake plate extending inwardly from a lower section of the moving rod to form a normal operating area between the backward guiding surface of the second brake plate and the third brake plate, an inwardly extended distance of the first brake plate is defined as W1, an inwardly extended distance of the second brake plate is defined as W2, an inwardly extended distance of the third brake plate is defined as W3, and both W3 and W1 is longer than W2;
- the housing having a portion thereof corresponding to an inner side of the moving rod has three inner surfaces with different heights, a first inner surface at an upper end of the housing portion, a third inner surface at a lower end of the housing portion, and a second inner surface located between the first and third inner surfaces, wherein the first inner surface is a V shape concave surface, the second inner surface is a flat surface, and the third surface is a small inclined surface;
- the lampshade having a stopping member extending downwardly from an end thereof opposite to the pivot hole;
- an elastic leaf arranged above the second terminal and contacting an outside surface of the stopping member for providing the lampshade with an elastic stopping force, whereby the lampshade can be held at a SET position when switched to the SET position, and maintain the moving rod in contact with the third inner surface of the housing portion;
- and
- when the lampshade is pressed as ON/OFF switch, the moving rod is driven to rise and fall in an inclined manner, and thereby a curved portion of the lower section of the moving rod moves along the second inner surface and the third inner surface;
- a three step switching operation involves the following steps:
- a) when the lampshade is pressed to an ON position, the curved portion of the lower section of the moving rod moves along the second inner surface to the third inner surface, causing the backward guiding surface of the second brake plate to push down the movable end of the binary alloy conductive plate and thereby cause the spring leaf to be sprung upwardly and place the first connecting point in contact with the second connecting point to achieve the conducting state;
- b) when the lampshade is pressed to an OFF position, the curved portion of the lower section of the moving rod moves along the third inner surface to the second inner surface, causing the third brake plate to pull the movable end of the binary alloy conductive plate upwardly and and thereby cause the spring leaf to be sprung downwardly and displace the first connecting point from contact with the second connecting point to achieve the nonconducting state;
- c) when the first connecting point of the binary alloy conductive plate is in contact with the second connecting point to achieve the conducting state, the curved portion of the lower section of the moving rod is located at the third inner surface, and the second brake plate is moved to an outermost position of its travel by an elastic force of the elastic leaf and causing the moving rod to have an angular rotation sufficient for the second brake plate to avoid contact with a position of the movable end of the binary alloy conductive plate, and when an overvoltage occurs, the binary alloy conductive plate will be deformed responsive to an elevated temperature and further to be sprung upward and directly push the first brake plate to displace the moving rod to in turn displace the lampshade to a BREAK status position, with the movable end of the binary alloy conductive plate being located at the dislocation area which between the first brake plate and the second brake plate;
- d) subsequent to the lampshade being displaced to the BREAK status position, pressing an OFF end of the lampshade to perform a RESET action and cause the moving rod to move upwardly where the curved portion of the lower section of the moving rod is moved to the first inner surface by the forward guiding surface of the second brake plate being displaced past the movable end of the binary alloy conductive plate to the normal operating area below the second brake plate, whereby the lampshade enables normal switching between the ON and OFF positions.