Electric tool

Abstract

The invention discloses an electric tool which comprises a casing, a motor, an output shaft and a clamping head, wherein the motor is contained in the casing; the output shaft is driven by the motor to rotate; and the clamping head is connected with the output shaft and a cutting tool. The electric tool is characterized in that the casing is provided with first impact teeth; the output shaft is provided with an impact device which can be axially moved to disconnect or connect with the clamping head; and the impact device is provided with second impact teeth which are matched with the first impact teeth of the casing. When the impact device and the clamping head are connected to rotate, the first impact teeth on the casing and the second impact teeth on the impact device form impact. As the automatic impact structure is adopted, the electric tool effectively utilizes the driving force of the motor, and applies the impact force on the clamping head in the clamping or loosening direction, the clamping head automatically loosens or clamps, and then the cutting tool can be conveniently and quickly disassembled or assembled. The invention has the advantages of simple structure, low costand convenient use.

Description

technical field [0001] The invention relates to an electric tool, in particular to an electric tool with a rotary cutter. Background technique [0002] Power tools such as electric wood milling and electric drills are usually driven by a motor to rotate the output shaft to drive the tool to rotate for cutting, drilling, etc., but the tool is easily worn during long-term use and needs to be replaced It is often necessary to replace tools of various specifications, but the process of disassembling and assembling tools with a wrench or similar functions is laborious and time-consuming. At the same time, tools such as wrenches are easily lost. British patent GB2351461A discloses a kind of electric wood milling with bevel gears on both the output shaft and the chuck, and the bevel gear on the casing is meshed with the bevel gears on the output shaft and the chuck at the same time, and the casing is manually rotated The bevel gear makes the output shaft and the bevel gear on the ...

AI Technical Summary

Problems solved by technology

[0002] Power tools such as electric wood milling and electric drills are usually driven by a motor to rotate the output shaft to drive the tool to rotate for cutting, drilling, etc., but in the long-term use process The tool is easy to wear and needs to be replaced, and it is often necessary to replace tools of various specifications during operation, but the process of disassembling and assembling the tool using a wrench or a tool with similar functions is laborious and time-consuming. At the same time, there are tools such as wrenches. Easy to lose and other problems

British patent GB2351461A discloses a kind of electric wood milling with bevel gears on both the output shaft and the chuck, and the bevel gear on the casing is meshed with the bevel gears on the output shaft and the chuck at the same time, and the casing is manually rotated The bevel gear makes the output shaft and the bevel gear on the collet rotate in opposite directions, so that the collet is released from the output shaft and the tool is replaced. Although this structure of disassembling and assembling the tool solves the problem of tool loss, However, the operator needs to rotate the bevel gear on the casing until the chuck is released, which is laborious and time-consuming

And Chinese patent CN2376354Y discloses a kind of impact self-locking collet structure of gun drill, can hit the collet by the motor rotation of gun drill, makes the collet automatically lock to cutter, yet, this structure needs the operator in gun drill When rotating the impact chuck, it is very laborious to hold the chuck cover without turning it, and this impact self-locking chuck structure is only suitable for power tools with low speed, and the scope of use is also very limited

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