JP2000254874A - Wiring connection structure of motor-driven hammering tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent damage to a wiring block due to relative movement of a vibration control handle to a tool body and to provide an increased life for a motor-driven hammering tool. SOLUTION: A terminal 19 connected to the lead wire 16 of the stator 2 of an electric motor is disposed at a wiring block (A) 20, a terminal 22 connected to a lead wire 17 connected to a switch 12 and a source code 13 is disposed at a wiring block (B) 21, the wiring block (A) 20 is mounted on the housing 1 side, and the wiring block (B) 21 is mounted on the handle 14 side. The wiring block (B) 21 is held at a holder 23 mounted on the inner wall 14a of the handle 14, and by effecting fit-in between the housing 1 and the handle 14, and the wiring block (A) 20 and the wiring block (B) 21 are interconnected through terminals 19 and 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric hammer drill, which has a drive unit driven by an electric motor, a hitting unit mechanism, and a handle to which a power cord and the like are attached. It is about.

[0002]

2. Description of the Related Art A conventional wiring connection structure of an electric impact tool will be described with reference to FIG. FIG. 7 is a vertical sectional side view showing an example of a wiring connection structure of a conventional electric hammer drill. The rotating motion of a rotor 3 of an electric motor housed in a housing 1 is controlled by a first gear 4, a crankshaft 5, a connecting rod 6 and a piston 7. Converted to reciprocating motion. Accordingly, the compression of the air chamber 8 fluctuates, and the striker 9 also reciprocates, and the tool holder 10
The tip tool 11 held by is hit. Handle 1
Reference numeral 4 is directly fixed to the tool body by a plurality of screws 18. A terminal 19 connected to the lead wire 16 of the stator 2 of the motor is connected to a wiring block (A) 2 made of an insulator.
0, and a terminal 22 connected to the switch 12 or the lead wire 17 connected to the power cord 13 is disposed in a wiring block (B) 21 formed of an insulator. Mounting the wiring block (A) 20 on the housing 1 side;
The wiring block (A) 20 and the wiring block (B) 21 are attached to the terminals 19 and 22 by attaching the wiring block (B) 21 to the handle 14 and fitting the housing 1 and the handle 14 together. Connected through.

[0003]

A case where a conventional connection structure using a wiring block as shown in FIG. 7 is used for an electric impact tool having an anti-vibration handle will be described. The wiring block (A) is mounted on the housing, the wiring block (B) is mounted on the handle, and both wiring blocks (A) and (B) are connected via respective terminals. Therefore, since the power tool main body and the handle cause relative movement due to the anti-vibration handle, the wiring block (B) attempts to move relative to the power tool body, that is, the housing and the wiring block (A) together with the handle. There is a problem that the wiring block (B), the handle and the housing of the wiring block (A) of the housing are damaged.

[0004] It is an object of the present invention to obviate the above-mentioned problems of the prior art and to improve the life of such an electric impact tool.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to arrange a terminal connected to a lead wire on a motor side in a wiring block (A) formed of an insulator, and to connect a lead wire connected to a switch and a cord. The wiring block (A) is mounted on the housing side, the wiring block (B) is mounted on the handle side, and the wiring block (B) is connected to the wiring block (B) formed of an insulator. An elastic body is disposed between the inner wall of the handle, the wiring block (B) is held by the elastic body, and the housing and the handle are fitted to each other.
This is achieved by connecting (B) via the terminal.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a longitudinal sectional side view showing an embodiment of a wiring connection structure of an electric hammer drill according to the present invention, FIG. 2 is a longitudinal sectional side view around a wiring block in FIG. 1, and FIG. 3 is a wiring block (B). Longitudinal side view when the and the holder are attached,
4 is a vertical side view of the holder, FIG. 5 is an external view of the holder in FIG. 4 as viewed from A, FIG. 6 is an external view of the holder in FIG. 5 when a housing and a handle are fitted, and FIG. It is a vertical side view which shows an example of the wiring connection structure of an electric hammer drill.

The rotational motion of the rotor 3 of the electric motor accommodated in the housing 1 is converted into a reciprocating motion by a first gear 4, a crankshaft 5, a connecting rod 6, and a piston 7. Accordingly, the compression of the air chamber 8 fluctuates, and the striker 9 also reciprocates, so that the tip tool 11 held by the tool holding unit 10
To blow. The handle 14 is an anti-vibration handle, and has a structure as described in JP-A-57-27680.

A terminal 19 connected to the lead wire 16 of the stator 2 of the motor is connected to a wiring block (A) 2 made of an insulator.
0, and a terminal 22 connected to the lead wire 17 connected to the switch 12 and the power cord 13 is provided in a wiring block (B) 21 formed of an insulator. The wiring block (A) 20 is stored in the housing portion 1a on the housing 1 side.
To the wiring block (B) 2
1 is attached to the handle 14 side, and the wiring block (B) 21 is attached to the inner wall 14a of the handle 14 and is held by a holder 23 formed of an elastic body, and the housing 1 and the handle 14 are fitted. Accordingly, the wiring block (A) 20 and the wiring block (B) 21 are guided into the storage portion 1a of the housing 1 and are guided.
Are connected via the terminals 19 and 22.

Here, the holder 23 is formed of rubber having elasticity, and the shape thereof is as shown in FIGS. The holder flange portion 23a is
4 is attached to the inner wall 14a by a holding portion 15a of the handle cover 15. The holder housing 23b holds the wiring block (B) 21 as shown in FIG. Before attachment, the holder leg 23c has a shape as shown in FIG. 5 and a length L1, but the housing 1 and the handle 1
The length L2 at the time of assembling is set so as to be deformed into a shape as shown in FIG. As a result, the holder leg always presses the wiring block (B) 21 against the wiring block (A) 20 by the elastic force of the rubber. When the housing 1 and the handle 14 are fitted, the wiring block (B) 21 is guided by the housing 1a of the housing 1. Therefore, even if the power tool main body, that is, the housing 1 and the handle 14 make relative movement, the displacement is absorbed by the holder 23, and the wiring block (A) 20 and the wiring block (B) 21 are always constant. Is held in the position. The elastic force of the holder 23 is set to an optimum elastic force for the main body thereof by changing the rubber hardness, the length L1 of the holder 23, the length L2 when the holder 23 is assembled, and the thickness T of the holder leg 23c. You can do it.

With the above construction, the handle 14 is connected to the power tool body, that is, the housing 1,
The wiring block (A) 20 and the wiring block (B)
21 is displaced by the holder 2
3 to prevent the wiring block (A) 20, the wiring block (B) 21, and the housing 1a of the housing 1 from being damaged.

[0012]

According to the present invention, the wiring block (A) in which the terminal connected to the lead wire on the motor side is formed of an insulator.
The wiring block (A) is attached to the housing side, and the terminals connected to the switches and the lead wires connected to the power supply cord are disposed on the wiring block (B) made of an insulator, and the wiring block (A) is provided. B) is attached to the handle side, an elastic body is provided between the wiring block (B) and the inner wall of the handle, and the elastic body holds the wiring block (B) and fits the housing and the handle, Since the wiring blocks (A) and (B) are connected via terminals, even if the handle relatively moves with respect to the power tool main body, that is, the housing, and the wiring blocks (A) and (B), the displacement of the handle also occurs. Can be absorbed by the elastic body, damage to the wiring blocks (A) and (B) and the wiring block housing portion of the housing can be prevented, and the life can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing one embodiment of a wiring connection structure of an electric hammer drill according to the present invention.

FIG. 2 is a longitudinal sectional side view around a wiring block of FIG. 1;

FIG. 3 is a vertical sectional side view when a wiring block (B) and a holder are mounted.

FIG. 4 is a vertical sectional side view of a holder.

FIG. 5 is an external view of the holder of FIG.

6 is an external view of the holder of FIG. 5 when a housing and a handle are fitted to each other.

FIG. 7 is a longitudinal sectional side view showing an example of a wiring connection structure of a conventional electric hammer drill.

[Explanation of symbols]

1 is a housing, 1a is a storage section, 2 is a stator, 3 is a rotor, 12 is a switch, 13 is a power cord, 14 is a handle, 14a is an inner wall, 15 is a handle cover, 15a is a holding section, and 16 and 17 are Lead wires, 19 and 22 are terminals, 20
Is a wiring block (A), 21 is a wiring block (B), 2
3 is a holder, 23a is a holder flange part, 23B is a holder storage part, and 23c is a holder leg part.

Claims (1)

[Claims] 1. A tool body having a housing accommodating an electric motor serving as a drive source, a tool holding portion for holding a tip tool, a striker for hitting the tip tool, and a drive portion for driving the striker. And a handle that houses a switch for starting or stopping the electric motor and to which a power cord is attached,
In a power tool formed by connecting and connecting an elastic body, a terminal connected to a lead wire on the motor side is disposed on a wiring block (A) formed of an insulator, and is connected to the switch or a power cord. A terminal connected to a lead wire is disposed on a wiring block (B) formed of an insulator, the wiring block (A) is mounted on the housing side, and the wiring block (B) is mounted on the handle side. An elastic body is disposed between the wiring block (B) and the inner wall of the handle, and the wiring block (B) is provided by the elastic body.
A wiring connection structure for an electric impact tool, wherein the wiring block (A) and the wiring block (B) are connected via the terminals by holding the housing and the handle.