Impact drill

Abstract

The invention relates to a percussion drilling used for processing a work-piece which includes a shell, a motor arranged in the shell, an aiguille arranged outside the shell and extending along the axial direction, an energy storage block driven by the rotation of the motor and a drive block which keeps relatively fixed with the aiguille. The energy storage block and the drive block are all provided with an end tooth that can cooperate mutually. The drive block is provided with a moving distance along the axial direction and an elastic piece is supported on the energy storage block so as to provide an axial reposition of the energy storage block. When the end tooth of the energy storage block is engaged with the end tooth of the drive block, the end tooth of the drive block can generate a radial force component and an axial force component. Through the structure, the percussion drilling can not only provide a steering effort of the aiguille, but also can provide an impulse force for the aiguille to the work-piece along the axial direction; thereby reducing the acting force needed to be applied by an operator.

Description

technical field [0001] The invention relates to a hand-held electric tool, in particular to a hand-held impact drill. Background technique [0002] Existing percussion drill can be shown with reference to Fig. 6, and it generally comprises casing 81, the motor 82 that is arranged in casing, the output shaft that extends outside casing, and output shaft is driven by motor shaft through reduction gear. One end of the output shaft is provided with a drill chuck, which is fixedly accommodated with a drill bit 83 for drilling holes on the workpiece. A movable toothed disc 91 is fixedly connected to the other end of the output shaft, and its rear end surface is usually distributed in a circular shape. Sixteen moving end teeth 911. The fixed toothed plate 92 is fixedly arranged on the casing 81, and its front face is opposite to the rear end face of the movable toothed plate, and sixteen static end teeth 921 are also arranged on the front end face to cooperate with the movable end...

AI Technical Summary

Problems solved by technology

[0003] However, when the percussion drill with this structure is working, the operator needs to apply a certain axial force to overcome the elastic force of the spring 93 so that the movable end teeth 911 mesh with the static end teeth 921

That is, the impact force of the drill bit on the workpiece in the axial direction actually comes from the operator, so when the position of the workpiece is special, such as above or above the operator's head, the operator not only needs to overcome the very large gravity of the impact drill itself , and it is necessary to provide the impact force of the drill bit on the workpiece, which is obviously very difficult for the operator

In addition, even if the position of the workpiece is normal, the reaction force from the workpiece will be directly transmitted to the operator during the impact on the workpiece, which will easily cause fatigue

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