Electric screwdriver

Abstract

The invention discloses an electric screwdriver. The electric screwdriver comprises a hollow cylindrical outer shell (1), a motor (7), a gear output shaft (2) connected with the motor (7), a tail cover (3), a battery (4) and a negative electrode contact chip (15). The tail cover (3) is arranged at the end, far away from the gear output shaft (2), of the outer shell (1), and the maximum diameter of the outer shell (1) ranges from 24 millimeters to 35 millimeters. The electric screwdriver further comprises a special-shaped spring (8) and a battery ring (14), wherein the special-shaped spring (8) is connected with the battery (4) and is arranged inside the tail cover (3), one end of the battery ring (14) is connected with the special-shaped spring (8), and the other end of the battery ring (14) is connected with the negative electrode contact chip (15). The tail cover (3) is connected with the outer shell (1) in a clamping mode. The electric screwdriver is convenient to install and capable of working in narrow space, bad contact cannot be generated, and the service life of the electric screwdriver can be prolonged.

Description

technical field [0001] The invention relates to the field of electric tools, in particular to an electric screwdriver. Background technique [0002] The installation of screws on precision products such as watches, glasses, and mobile phones is a very important process. Whether the installation is good or not directly affects the performance of the product. According to the prior art, an electric screwdriver equipped with a battery is generally used to install the screws of precision products such as clocks, glasses, and mobile phones, and the negative pole of the battery is connected to the On the circuit, this structure has the following disadvantages, first: the contact piece in the tail cover needs to be welded on the tower spring, so the installation is very troublesome, and second: welding is prone to poor contact, which affects the normal work of the electric screwdriver. In addition, the two contact pieces will generate friction during the screwing process of th...

AI Technical Summary

Problems solved by technology

According to the prior art, an electric screwdriver equipped with a battery is generally used to install the screws of precision products such as clocks, glasses, and mobile phones, and the negative pole of the battery is connected to the On the circuit, this structure has the following disadvantages, first: because the contact piece in the tail cover needs to be welded on the tower spring, so the installation is very troublesome, second: welding is prone to poor contact, which affects the normal work of the electric screwdriver

In addition, the two contact pieces will generate friction during the screwing process of the tail cover. After a long time, the two contact pieces will age and deform. The two contact pieces of the electric screwdriver are easily disconnected during the vibration process, causing electric The interruption of the screwdriver work reduces the service life of the electric screwdriver

[0003] Due to the large size of the electric screwdriver in the prior art, the electric screwdriver cannot be installed and disassembled in some narrow spaces, and it is not convenient to carry

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