Speed-control switch with kick device

Abstract

The invention discloses a speed-control switch with a kick device, which comprises a casing and a button component arranged at the inner part of the casing, a contact terminal component driven by the button component and a locking block component used for matching the button component to realize the up and down kick of the second moving contact component, wherein the contact terminal component comprises a first contact terminal component used for controlling the make-and-break of a speed regulation circuit board and a second contact terminal component used for short-connecting a speed regulation circuit of the speed regulation circuit board; a first moving contact in the first contact terminal component is connected with the casing through a spring; a protruding pole with the capability of pushing the first moving contact upward to compress the spring is arranged on the button component. After the first moving contact is contacted with a first fixed contact, the pressure between the first moving contact and the first fixed contact is constant and relatively static; the first moving contact and the first fixed contact can be in contact with each other tightly and are communicated well; the happening of the burning loss of the contact terminals by an electric arc when the speed regulation switch with the kick function communicates the speed regulation switch in the prior art is avoided; the shortening of the switch service life due to the frequent excessive compression of the spring connected with the first moving contact can be avoided.

Description

technical field [0001] The invention relates to the field of electric switches, in particular to a speed regulating switch with a kick device. Background technique [0002] Speed ​​control switches are used in electric tools such as electric drills, electric grinders, electric wrenches and electric screwdrivers. A traditional speed control switch mainly includes a housing, a button assembly, a contact assembly and a speed control circuit board arranged in the housing. Usually, the contact assembly includes two moving contacts and two static contacts. When working, press the button assembly, firstly drive the first moving contact to connect with the first static contact, turn on the speed regulating circuit board, at this time the electrical appliance starts to start; as the button assembly continues to be pressed down, the speed regulating circuit The board outputs a continuously changing voltage to the outside, and then realizes the speed regulation function; when the butt...

AI Technical Summary

Problems solved by technology

When the button assembly (2) is pressed, the first moving contact (5) first contacts the first static contact (51, 52), and as the movable frame (21) continues to move down, because the first static contact (51, 52), at this time, the first moving contact (5) will move upward relative to the movable frame (21), and compress the spring (53) in the cavity, resulting in the continuous increase of the elastic force of the spring (53) , while the first moving contact (5) will rub against the inner wall of the cavity when moving upward relative to the cavity, under the joint action of the elastic force of the spring (53) and the friction force of the inner wall of the cavity, the first moving contact (5 ) is prone to twisting and shifting, which will lead to relative displacement between the two contacts on the first moving contact (5) and the first static contact (51, 52), and the conductive stability during speed regulation Poor; in addition, during the pressing down process of the button assembly (2), the first moving contact (5) often forces the spring (53) to be over-compressed, which can easily cause damage to the spring (53), thereby shortening the service life of the switch

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