Switch in electric power tool

Abstract

The invention discloses a switch in an electric power tool which is simple in structure and quick to reverse. The switch comprises a casing, wherein a reverse base is arranged in the casing; three terminals distributed in a regular triangle manner are arranged on the reverse base; a driving lever is hinged to the casing; one end of the driving lever extends out of the casing, and the other end of the driving lever is positioned in the casing; a reverse sheet is arranged at the end, positioned in the casing, of the driving lever; one end of the reverse sheet is contacted with one of the terminals; when the other end of the reverse sheet is positioned between the other two terminals, the switch is in a closed state; after the driving lever rotates, the other end of the reverse sheet is contacted with one of the other two terminals, and the switch is in a forward or backward rotating state; a circuit board is arranged on one side of the reverse base; and the three terminals on the reverse base are connected with the circuit board via leads respectively. The switch has the advantages that the terminals are distributed in a triangular manner, so that the rotating range of the driving lever, the occupied space of the terminals and the size of the switch are reduced.

Description

technical field [0001] The invention relates to a switch in an electric tool. Background technique [0002] In view of the switches in commonly used electric tools, the reversing structure is relatively complicated (independent reversing) and the shell is assembled. In order to cooperate with the reversing structure and consider the safety, the distance between the ends of the four pairs of terminals is designed to be very large, which makes the overall size of the reversing device larger, and poor contact is prone to occur during the reversing operation. There are many parts, which makes assembly inconvenient. In the past, all reversing terminals are assembled on the base body. At present, the main control circuit board of the mainstream brushless motor switch is mostly connected to the outside of the switch through a flexible board and wires. The main control board is added outside the switch body, resulting in a large switch volume, so that it is difficult for an assem...

AI Technical Summary

Problems solved by technology

The main control board is added outside the switch body, resulting in a large switch volume, so that it is difficult for the assembler, the cost of the switch is high and the volume is large, and the application of small and micro electric tools is limited.

Most of the existing switch bodies are designed with dust-proof grooves around them, and a relatively simple annular sealing ring is used at the push rod to achieve dust-proof, but because the push rod will reciprocate, the annular sealing ring is easy to Deformation produces a large gap, so that in the dusty outdoor working environment, dust can easily enter the inside of the switch, shortening the life of the internal parts and components of the switch, thereby shortening the life of the switch

Images