JPH0321904Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a grounding device for a power tool having a resin housing and a handle.

FIG. 1 shows an example of an electric circular saw as a conventional grounding device. In the case of electric circular saw,
The handle 1 and housing 4, which are often touched by an operator, are molded from resin for insulation. Also, a switch (not shown) is installed on the handle 1.
and a control circuit (not shown), etc., and conventionally, the grounding of this switch and control circuit, etc.
As shown in the figure, it was extended from the handle 1 and screwed to a metal gear cover 5. Conventionally, this was the structure, so the housing 4 and gear cover 5 had to be assembled with the ground wire terminal 2 exposed outside the handle 1, and the gear cover 5 had to be tapped when it was manufactured. It had become necessary. Therefore, it has conventionally had disadvantages of poor assembly workability and high processing costs.

An object of the present invention is to eliminate the drawbacks of the conventional grounding devices described above, and to provide a power tool with good assembly workability and low processing cost.

This invention focused on the fact that assembly would be easier if the ground wire was automatically connected to the gear cover when the housing was assembled into the gear cover, and the relationship between the gear cover, housing, handle, plate, and ground wire was devised. be.

An example in which the present invention is applied to an electric circular saw will be explained with reference to FIGS. 2 and 3.

As shown in FIG. 2, a cylindrical protrusion 7 is provided inside the handle 1, and a screw 8 is attached to the protrusion 7 so as to sandwich the ground wire terminal 2 and the conductive plate 3. The conductive plate 3 has one end attached to the ground wire terminal 2 with a screw 8, and the other end held in a groove 6 of the gear cover 5.

During assembly, parts such as a stator are assembled into the housing 4, a switch, a cord, etc. are attached to the handle 1, and the ground wire terminal 2 is screwed together with the conductive plate 3. The housing 4 is assembled to the gear cover 5 in this state. At this time, the conductive plate 3 protruding from the housing 4 is inserted into the groove 6 provided in the gear cover 5 together. Here, the end of the conductive plate 3 to be inserted into the groove 6 of the gear cover 5 can be made elastic by, for example, being slightly curved in the insertion direction. It is fixed to the gear cover 5 without wobbling. This ensures that current flows from the ground wire terminal 2 through the conductive plate 3 to the gear cover 5. In addition, in the present invention, the screws 8, which were conventionally attached to the metal gear cover 5, are attached to the projections 7 in the resin handle 1, eliminating the need for a screw tap (the handle 1 is made of resin Therefore, the protrusion 7 can be made by injection molding, etc.), and processing costs can also be reduced.

According to the present invention, since the connection of the ground wire to the gear cover is simplified, it is possible to improve workability and reduce processing costs.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a conventional example, FIG. 2 is an enlarged sectional view showing an embodiment of the present invention, and FIG. 3 is a sectional view taken along the line B--B in FIG. 1 is a handle, 2 is a ground wire terminal, 3 is a conductive plate, 4 is a housing, 5 is a gear cover, and 6 is a groove.

Claims (1)

[Scope of utility model registration request] A power tool that has a metal gear cover that houses a reduction part, a resin housing that houses a motor, a handle attached to the housing, and a ground wire that runs through the handle, and that grounds the gear cover. . A grounding device for a power tool, characterized in that a conductive plate attached to the handle together with the ground wire terminal protrudes from the housing and is inserted into the gear cover.