Speed regulation shifting device for electric tool

Abstract

The invention discloses a speed control and shift mechanism for electric tools, comprising driving component and transmission device. The transmission device comprises shifting fork and guide component. The shifting fork component is set on the guide component and can move in straight line. Said transmission device also comprises middleware and elastic component. Said driving component drives the middleware move. Said elastic component is located between middleware and shifting fork. The elastic component can store potential energy, which can be released instantly. The structure makes the shift easy, the operation convenience. It can be operated by single hand.

Description

technical field [0001] The invention relates to a speed regulating and shifting device for an electric tool. Background technique [0002] U.S. Patent No. US6,105,450 discloses a rack-and-pinion speed-adjusting and shifting mechanism used on an electric tool. The speed-adjusting and shifting mechanism includes a knob and a pinion connected to the knob, and a shift fork Cooperate with the sliding ring gear in the electric tool, a rack mechanism is connected with the shift fork, the pinion gear cooperates with the rack mechanism, and by rotating the knob, the shift fork is driven to move, so that the sliding ring gear will be dialed to mesh with different gears, resulting in different output speeds. In addition, there are many other types of speed-adjusting and shifting mechanisms currently on the market. For example, there is one that converts the rotary motion of the knob into the linear motion of the shift fork by using a crank linkage mechanism, so that the sliding gear s...

AI Technical Summary

Problems solved by technology

In addition, there are many other types of speed-adjusting and shifting mechanisms currently on the market. For example, there is one that converts the rotary motion of the knob into the linear motion of the shift fork by using a crank linkage mechanism, so that the sliding gear set is driven by the shift fork. The gears are meshed to output different speeds to play the role of shifting. Another is to use a worm gear structure to convert the rotary motion of the knob into the linear motion of the shift fork, so that the sliding gear set and the intermediate shaft are driven by the shift fork. Different gear meshes to output different speeds to play the role of shifting. Of course, there are many other types of speed-adjusting and shifting structures, which will not be listed here. Although there are so many types of speed-adjusting and shifting mechanisms, but They all have a common problem that when shifting gears, when the knob is turned halfway, because the tooth end of the sliding ring gear touches the tooth end of the gear that needs to mesh with it, the knob cannot continue to rotate to the fixed gear. , at this time, it is necessary to rotate the knob with one hand, and at the same time the other hand is turned on at a low gear or rotates the collet to change gears, so the operation is very inconvenient

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