Electric hammer

Abstract

The invention provides an electric hammer, comprising an enclosure, a motor, a transmission mechanism and an impact assembly, wherein the enclosure is used for supporting a nail striking device; the motor is arranged in the enclosure and the transmission mechanism is driven by the motor; the impact assembly comprises an impact wheel and a middle shaft for supporting the impact wheel; an impact part of the impact wheel is impacted to a striking shaft of the nail striking device; the middle shaft is supported on a first supporting piece and a second supporting piece; the first supporting piece and the second supporting piece are respectively located at the two sides of the impact assembly; and an axis of the middle shaft is substantially vertical to the output axis of the motor, wherein the ratio of the length of the middle shaft along the axis direction to the diameter of the motor is in a range of 1-1.4. The electric hammer disclosed by the invention is compact in structure and small in size; particularly, the distance from the center of the striking shaft to the two sides of the head part of the enclosure is shorter; and on the aspect of function, the striking work of nails at the corners at a narrow space position can be realized.

Description

technical field [0001] The invention relates to an electric tool, in particular to an electric hammer capable of striking fasteners such as nails. Background technique [0002] Electric hammers are a commonly used hand-held tool with a wide variety. According to the power source, electric hammers can be divided into two categories: pneumatic and electric. Among them, the pneumatic electric hammer must be equipped with a compressed air source, so its use is limited. The basic structure of the electric hammer can be summarized as follows: the motor placed in the gun body is connected with the nail rod placed at the gun head through the rotation-linear transmission mechanism, so that the electrical energy can be converted into reciprocating mechanical energy under the control of the switch. [0003] US Patent No. US6431430 and PCT International Patent Application Publication No. WO2006 / 008546 both disclose an electric hammer with a crank slider mechanism as a rotation-linear...

AI Technical Summary

Problems solved by technology

The problem with this type of electric hammer is that the crank slider mechanism cannot achieve real hitting, and is essentially a "push" nail mechanism. Under the same motor power, the efficiency of pushing nails is much lower than that of driving nails. The second is that during each nail pushing process, the crank slider mechanism must push the nail pushing element to travel the same stroke. When the nail encounters a hard object and the resistance is too large, it is easy to cause the motor to stall and cause the motor to be damaged; The third is that the motor is placed on the front or rear side of the handle, and it is connected with the transmission mechanism to occupy a large space, which makes the electric hammer larger and not convenient to carry and operate.

Although the electric hammer utilizes spring energy storage to realize instant hitting on the nail, it can only be clicked one by one, and cannot be hit continuously, and the hitting force generated only by the energy released by the spring is not efficient, resulting in the electric hammer being ineffective. It is suitable for frequent use as a conventional tool; in addition, its motor is located in the casing under the gun head, completely separated from the handle, and there is still the problem of not being compact

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