JPH0811067A - Electric tool wiring connection structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a wiring connection structure for an electric tool that prevents the lead wire from breaking due to vibration during use. [Structure] The lead wires 13 and 14 of the stator 12, the connection terminals 27a and 27b of the lead wires 53 and 54 of the anti-noise element 52,
A wiring block 50 provided with 27c and 27d is attached to the housing 5, and a wiring block 51 provided with connection terminals for the switch 2 and the lead wires 15 and 16 of the pillar terminal 11.
Attached to the handle body 1, and the wiring block 50,
51 are the connection terminals 29a and 29b, and the connection terminal insertion port 3
0a and 0b are provided, and the handle body 1 is attached to the housing 5, so that the terminals 29a and 29b and the insertion ports 30a and 30b are fitted to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring connection structure for an electric power tool, and has a housing for accommodating an electric motor and a handle for accommodating a switch and mounting a power cord, for example, wiring for an electric power tool such as an electric hammer drill. It relates to a connection structure.

[0002]

2. Description of the Related Art A wiring connection structure of a conventional power tool, for example, an electric hammer drill will be described with reference to FIGS.

FIG. 10 is a perspective view of a handle of a commonly used electric hammer drill, and FIG. 11 is a vertical sectional view of a wiring connection structure of a conventional electric hammer drill. In FIGS. 10 and 11, 1 is the handle body,
2 is a switch, 3 is a power cord, 4 is a handle cover, 5
Is a housing, 6 is a power cord cord clip, 7 is a screw, 8 and 9 are power cord lead wires, 11 is a pillar terminal, 12 is a motor stator, 13 and 14 are stator lead wires, and 15 is a switch. Leads connected to, 1
6 is a lead wire connected to the pillar terminal, 17, 1
8 is a screw, 19 and 20 are connectors for connecting electric wires, 21,
22 and 23 are screws.

As shown in FIG. 10, the structure of the handle is as follows.
After the switch 2 and the cord 3 are attached to the handle body 1, the handle cover 4 is attached.

As the method for assembling the electric hammer drill, the handle body 1 and the handle cover 4 are assembled, then they are attached to the housing 5, and the handle body 1 is first attached to the housing 5, and then the handle body is attached. There is a method of attaching the handle cover 4 to the No. 1.

The former method will be described with reference to FIGS.

First, the power cord 3 is fixed to the handle body 1 by the cord clip 6 and the screw 7, the lead wires 8 and 9 of the power cord 3 are connected to the switch 2 and the pillar terminal 11, respectively, and the motor stator 12 is connected. The lead wires 15 and 16 connected to the lead wires 13 and 14 are connected to the switch 2 and the pillar terminal 11, respectively.

Next, after the switch 2 and the pillar terminal 11 are housed in the handle body 1, the handle cover 4 is assembled in the handle body 1 and the screw 17
And the screw 18 for fixing. Then, the lead wires 13 and 14 of the stator 12 and the lead wires 15 and 1 of the handle body 1 side.
6 are connected by crimping with connectors 19 and 20, respectively, and then the handle main body 1 is fitted into the housing 5 and fixed with screws 21, 22 and 23.

In the latter method, first, the lead wires 13 and 14 of the stator 12 and the lead wires 15 and 16 connected to the switch 2 and the pillar terminal 11 are connected to the connector 1 respectively.
Crimping connection with 9 and 20 and handle body 1 to housing 5
After the mounting, the wiring connection between the switch 2 and the pillar terminal 11 in the handle main body 1 and the wiring connection for the power cord 3 were performed, and finally, the handle cover 4 was attached.

Further, in an electric power tool, a commutator motor is generally used as an electric motor as a drive source. Since the commutation spark of the commutator motor becomes a noise source, depending on the destination, a noise prevention element (in this specification, a noise prevention element), specifically, a tool provided with a capacitor element is also available. .

There are two methods for assembling the electric hammer drill having the noise prevention element, as in the case where the noise prevention element is not provided. FIG. 12 is a vertical cross-sectional view of a wiring connection structure of an electric hammer drill having a noise prevention element according to a conventional technique.

In FIG. 12, the same reference numerals as those in FIGS. 10 and 11 are the same parts and are therefore omitted, and only new reference numerals will be described. Reference numeral 52 is a noise prevention element, and 53 and 54 are lead wires of the noise prevention element.

With reference to FIG. 12, two methods of the electric hammer drill having the noise prevention element will be described. One method is to fix the power cord 3 to the handle body 1 with the cord clip 6 and the screw 7, and connect the lead wires 8 and 9 of the power cord 3 to the switch 2 and the pillar terminal 11, respectively.

Next, the lead wire 1 of the stator 12 of the electric motor
Lead wires 15 and 16 connected to lead wires 53 and 54 of the anti-noise element 52 are connected to the switch 2 and the pillar terminal 11.

Next, the switch 2 and the pillar terminal 11
After storing and in the handle body 1, the handle cover 4
Is assembled into the handle body 1 and fixed with screws 17 and 18. Then, the lead wire 13 of the stator 12 and the anti-noise element 52
5 and the lead wire 15 on the handle body 1 side are connected by crimping the connector 19, and similarly, the lead wire 14 of the stator 12, the lead wire 54 of the noise prevention element 52, and the handle. The lead wire 16 on the main body 1 side is connected by crimping the connector 20, and then the handle main body 1 is fitted into the housing 5, and the screws 21, 2
Fix at 2, 23.

Another method is to connect the lead wires 13 and 14 of the stator 12, the lead wires 53 and 54 of the anti-noise element 52, and the lead wires 15 and 16 of the handle body 1 to the connectors 19 and 20, respectively. Connect by crimping. After the handle body 1 is attached to the housing 5, the wiring connection inside the handle body 1, that is, the power cord 3 is fixed to the handle body 1 by the cord clip 6 and the screw 7, and the lead wires 8 and 9 of the power cord 3 are fixed. In this method, the switch 2 and the pillar terminal 11 are connected and the handle cover 4 is finally attached.

[0017]

In the wiring connection structure of the electric power tool, for example, the electric hammer drill in the prior art, when the lead wire of the stator is connected to the switch and the lead wire to be connected to the power cord, the housing and the handle are connected. Since the connection work is done in the separated state, the lead wire to be connected must be long. Therefore, when using the electric hammer drill, there is a problem that the lead wires are easily broken due to the vibration of the electric hammer drill itself.

Further, the wiring work performed in the conventional electric hammer drill in a state where the housing and the handle are separated can be temporarily avoided by adopting a wiring connection structure using a wiring block. Since the structure is only inserted and installed in the housing and the housing of the handle, when the handle is assembled to the housing, the wiring block rises or comes off from the housing or the housing of the handle, and the assemblability is poor. There was a problem.

Further, in the wiring connection structure using each wiring block, as described above, since the wiring block is simply inserted and mounted in the housing and the accommodation portion of the handle, there is a play between the wiring blocks after mounting. However, there was a problem of causing so-called backlash.

Further, in the wiring connection structure using the wiring block, when the handle is removed from the housing at the time of disassembling for repair or the like, the wiring block is disengaged from the housing or the housing portion of the handle, and both wiring blocks are removed. However, there is a problem in that the handle is pulled too much to break the lead wire or the connecting portion between the lead wire and the terminal is damaged.

Further, in the wiring connection structure using each of the wiring blocks, a method of screwing to the housing and the handle can be considered, but screwing increases the number of parts and the number of assembling steps, resulting in high cost. In addition, there is a problem in that it requires a large space and goes against the direction of technological progress toward miniaturization.

The object of the present invention is to eliminate the above-mentioned problems of the prior art, to improve the life of the electric power tool, and to
An object of the present invention is to provide a wiring connection structure capable of improving disassembly and repairability, satisfying necessary functions in a minimum space, and downsizing an electric power tool.

[0023]

In order to achieve the above object, the structure of the wiring connection structure for an electric power tool according to the present invention has a tool holding part for holding a tip tool and a power transmission for transmitting power to the tool holding part. A transmission unit, a housing that houses an electric motor that is a drive source, and a handle that houses a switch for starting or stopping the electric motor and that has a power cord attached,
In a wiring connection structure of an electric tool that electrically connects the electric motor to the switch and the power cord and attaches the handle to the housing, an insulator having a connection terminal with a lead wire of a stator of the electric motor. One molded wiring block is attached to the housing side, and another wiring block molded of an insulator having a connection terminal for the switch and the lead wire of the power cord is attached to the handle side, and the housing is provided. Terminals that engage with each other and are electrically connected by attaching the handle to the wiring blocks are provided in the both wiring blocks.

In the wiring connection structure for an electric power tool according to the preceding paragraph, a protrusion is provided on a side surface of each of the wiring blocks, and a recess or a through hole that engages with the protrusion is provided on a side wall of the wiring block housing. One of them is arranged, and an elastic material is used for both the members.

In the wiring connection structure for an electric power tool according to any one of the preceding paragraphs, the protrusion has a tapered portion.

Another structure of the wiring connection structure for an electric power tool according to the present invention is a tool holding portion for holding a tip tool, a power transmission portion for transmitting power to the tool holding portion, and an electric motor as a drive source. A housing that is electrically connected to the electric motor and that houses an anti-noise element that reduces electric noise from the electric motor; and a handle that houses a switch that starts or stops the electric motor and that is attached with a power cord. In a wiring connection structure of an electric tool for electrically connecting an electric motor and the noise prevention element to the switch and the power cord, and attaching the handle to the housing, a lead wire of a stator of the electric motor and the noise prevention element. One wiring block having a lead wire connection terminal and formed of an insulator is attached to the housing side, and the switch and the power cord are attached. Another wiring block, which has a connection terminal with a lead wire and is formed of an insulator, is attached to the handle side, and the handle is attached to the housing so that they are engaged with each other and electrically connected. Terminals are provided on both of the wiring blocks.

In the wiring connection structure for an electric power tool according to the preceding paragraph, a terminal of either one of the wiring blocks on the housing side or the other wiring block on the handle side is formed of a blade conductor. Is.

In the wiring connection structure for an electric tool according to any one of the preceding paragraphs, the lead wires of the switch and the power cord are bent at an acute angle, and an elastic material is used as a covering material for each lead wire to restore the lead wire. It is characterized in that the mutual engagement of the terminals of the two wiring blocks is matched by the force and the elastic force of the elastic material.

[0029]

The function of each of the above technical means is as follows.

According to the first aspect of the invention, the wiring block having the terminals for connecting the lead wires of the stator is mounted on the housing side, and the terminals for connecting the lead wires connected to the switch and the power cord are provided. By mounting the wiring block on the handle side and providing terminals for engaging the wiring blocks with each other, when the handle is mounted on the housing, the terminals can be engaged with each other and electrically connected. Therefore, the lead wire is shortened, and it is possible to prevent disconnection of the lead wire due to vibration of the power tool itself when the power tool is used.

According to the structure of the second aspect of the present invention, the protrusions are provided on the side surfaces of both wiring blocks, and the recesses or the through holes that engage with the protrusions are provided on the side walls of both wiring block accommodating portions. Since the elastic member is used for both the members, when the handle is fitted to the housing and the protrusion and the recess or the through hole are engaged with each other, the bending action of both the members, that is, the elastic deformation action, It is possible to prevent both wiring blocks from being separated from the housing or the handle.

According to the structure of the third aspect of the invention, since the tapered portion is formed on the protrusion, the protrusion smoothly engages with the recess or the through hole, and the assembly becomes easy.

Further, according to the inventions of claims 2 and 3, even when the electric power tool is disassembled, the housing and the handle can be separated in a state in which both the wiring blocks are attached.

According to the structure of the invention of claim 4, a wiring block having terminals for connecting the lead wire of the stator and the lead wire of the noise prevention element is attached to the housing side, and the lead wire is connected to the switch and the cord. By attaching a wiring block having a terminal for connecting to the handle side, and providing terminals for engaging with each other on both wiring blocks, when the handle is attached to the housing, the both terminals engage with each other,
In addition, since the electric wires can be electrically connected, the lead wires to be connected are shortened even when the noise prevention element is provided, and the breakage of these lead wires due to the vibration of the electric tool itself is prevented when the electric tool is used. be able to.

According to the fifth and sixth aspects of the invention, each terminal of the wiring block is formed of a blade conductor, the lead wires of the switch and the power cord are bent at an acute angle, and the covering material of each lead wire is formed. Since the elastic material is used for the above, the mutual engagement of the terminal portions of the both wiring blocks can be aligned by the restoring force of the lead wire and the elastic force of the elastic material, and so-called play can be eliminated.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS.
Will be described with reference to.

[Embodiment 1] In this embodiment, an electric hammer drill will be described as an example.

FIG. 1 is a vertical sectional view of a wiring connection structure of an electric hammer drill according to an embodiment of the present invention, and FIG. 2 is a vertical cross section of a wiring connection structure of an electric hammer drill shown in FIG. 1 before a handle is fitted to a housing. FIG. 3 is a perspective view of a wiring block in the wiring connection structure of FIG. 1, FIG. 3A is a housing side wiring block, FIG. 3B is a handle side wiring block diagram, and FIG. 10 is generally used. Figure 3 shows a perspective view of a handle in a power tool that is present. In the figure, the same reference numerals as those in FIG. 11 are the same parts, and thus the repetitive description will be omitted and only new reference numerals will be described. 24 in FIGS.
Is a wiring block on the housing side, 25 is a wiring block on the handle side, 26 and 26 'are insulators, 27, 28 and 29 are insertion portions of connection terminals, 30 is a terminal insertion port for connection, 31,
Reference numeral 32 is a connecting electric wire.

First, the structure of the wiring connection structure of the electric hammer drill according to the embodiment of the present invention will be described. The common part with the prior art will be simplified and the characteristic part will be described in detail.

As shown in FIG. 1, in the handle, the switch 2 and the cord 3 are attached to the handle body 1, and then the handle cover 4 is attached. The cord 3 is fixed to the handle body 1 by the cord clip 6 and the screw 7,
The lead wires 8 and 9 of the cord 3 are connected to the switch 2 and the pillar terminal 11.

As shown in FIG. 3, in the housing side wiring block 24 used for wiring connection, a terminal 27 to which the lead wires 13 and 14 of the stator 12 of the electric motor are connected to the upper surface of a rectangular insulator 26 and its terminal. A terminal 29 connected to the handle side wiring block 25 is provided on one side surface. Both connection terminals 27 and 29 are electrically connected in the insulator 26.

In the handle side wiring block 25, a connection terminal 28 to which the lead wires 15 and 16 connected to the switch 2 and the pillar terminal 11 are connected is provided on the upper surface of a substantially rectangular insulator 26 '. The connection terminal 29 provided on the housing side wiring block 24 is provided on one side surface.
There is provided a terminal insertion port 30 that is electrically connected to and accommodates.

On the surface opposite to the side surface to which the terminal insertion port 30 is attached, a cut portion is provided so as to be in close contact with the handle body 1 when attached. Further, the connection terminal 28 and the terminal insertion port 30 are electrically connected in the insulator 26 '.

Next, the assembly of the electric hammer drill will be described with reference to FIG.

After the wiring inside the handle body 1 is completed, the handle cover 4 is fitted into the handle body 1 and the screws 17, 18
Fix with. Next, the lead wires 13 and 14 of the stator 12
Is connected to the terminal 27 of the housing side wiring block 24, and then attached to the housing 5. Lead wires 15 and 1 respectively connected to the switch 2 and the pillar terminal 11.
6 to the terminal 28 of the handle side wiring block 25,
The handle side wiring block 25 is attached to the handle body 1.

When the handle body 1 is fitted into the housing 5, the terminals 2 of the housing side wiring block 24 are
9 and the terminal insertion port 30 of the handle side wiring block 25 are fitted and connected. Finally, the housing 5 and the handle main body 1 are fixed with screws 21, 22, and 23.

With the above-described structure, the wiring work can be separately performed on the housing 5 side and the handle body 1 side, and therefore, the lead wires 13 and 14 of the stator 12, the switch 2 and the pillar terminal 11 are connected. The lead wires 15 and 16 can be shortened, and disconnection of these lead wires due to vibration of the electric hammer drill body can be prevented.

[Embodiment 2] Another embodiment of the present invention will be described.

FIG. 4 is a perspective view of a wiring block of a wiring connection structure for an electric hammer drill according to another embodiment of the present invention,
FIG. 4A shows the housing side wiring block, and FIG. 4B shows the handle side wiring block. 5 is a wiring block A- of FIG. 4 incorporated in an electric hammer drill.
It is an A'cross section figure. In the figure, the same reference numerals as those in FIG. 3 and FIG.
Since they are equivalent parts, repetitive description will be omitted and only new symbols will be described.

4 and 5, reference numeral 24a is a housing side wiring block, 25a is a handle side wiring block, 3
3, 34, 39, 40 are protrusions, 35, 36, 41, 4
2 is a side wall, 37 and 38 are square holes, 43 and 44 are long groove portions, 4
5 to 48 are tapered portions.

In the present embodiment, regarding connection with the power source side, fitting of the housing 5 and the handle body 1 and the like,
Although it is similar to [Embodiment 1] and has many other common parts, the description of those parts will be omitted, and the characteristic parts of this embodiment will be described in detail.

As shown in FIGS. 4 and 5, protrusions 33 and 34 are provided on the side surfaces of the housing side wiring block 24a and the handle side wiring block 25a, respectively.
Tapered portions 45 and 46 are formed on the protrusions 33 and 34, respectively. The housing 5 and the handle body 1
The housing-side wiring block 24a and the handle-side wiring block 25a are respectively provided with storage parts therein, and the side walls 35 and 3 of the storage parts are provided.
6 includes square holes 37 and 3 that engage with the protrusions 33 and 34.
8 are arranged respectively.

Further, projections 39 and 40 are provided on the opposite side surfaces to the side surfaces provided with the projections 33 and 34, respectively, and taper portions 47 and 48 are formed on the projections 39 and 40, respectively. ing. Side walls 35, 36 of the storage section
Long groove portions 43, 44 for guiding the protrusions 39, 40 are provided on the side walls 41, 42 facing each other.

In this embodiment, after the wiring inside the handle body 1 is completed, the handle cover 4 is attached to the handle body 1. Next, when the lead wires 13 and 14 of the stator are connected to the terminals 27 of the housing side wiring block 24 and the wiring block 24 is pushed into the insertion port of the housing 5,
Due to the resin bending action, that is, the elastic deformation action, on the side walls 35, 41 of the storage portion or the side surface portion of the wiring block 24,
Taper portions 45 formed on the protrusions 33 and 39,
By 47, the wiring block 24 is smoothly inserted into the storage portion, and the protrusion 33 is engaged with the square hole 37.

With the above construction, when the handle body 1 is attached to the housing 5, the terminal 29 of the housing side wiring block 24a and the terminal insertion port 30 of the handle side wiring block 25a are fitted and connected. But,
At this time, each wiring block 24a, 25a is prevented from coming off from the housing 5 or the housing portion of the handle main body 1, and finally, the housing 5 is secured by the screws 21, 22, 23.
And the handle body 1 are fixed. Furthermore, even when the wiring block 24a, 25a is attached to the housing 5 and the handle main body 1, the housing 5 and the handle main body 1 can be separated from each other even when disassembling for repair or the like.

[Embodiment 3] Another embodiment of the present invention is shown in FIG.
It will be described with reference to FIGS. 9 and 10.

FIG. 6 is a vertical sectional view of a wiring connection structure of an electric hammer drill according to another embodiment of the present invention, FIG. 7 is a sectional view of a wiring block of the wiring connection structure of FIG. 6, and FIG. 8A is a perspective view of a wiring block of the wiring connection structure of FIG.
7 is a perspective view of the housing side wiring block of the wiring connection structure of FIG. 7, FIG. 8B is a perspective view of the wiring block of the wiring connection structure of FIG. 7, and FIG. 9 is a schematic cross-sectional view of the terminal portion of FIG. .

In the figure, the same reference numerals as those of [Embodiment 1] in FIG. 1 are the same portions, and the same reference numerals as those in FIG. 12 of the prior art are the same portions, so that the repetitive description is omitted and a new reference numeral is given. Only explain. Reference numeral 50 is a housing side block, 51 is a handle side wiring block, 1a is a storage portion 1a of the handle side wiring block 51, and C is a space between the wiring block 51 and the storage portion 1a.

This embodiment is almost the same as [Embodiment 1], but since the anti-noise element, that is, the capacitor element is provided, the wiring block has a structure adapted to it. As described above, including the structure of the handle,
The description of the same parts as in [Example 1] of
The characteristic part will be described.

As shown in FIGS. 7, 8 (a) and 8 (b), the housing side wiring block 50 and the handle side wiring block 51 are both molded with insulators 26 and 26 ′. The housing side wiring block 50 has terminals 27.
a, 27b, 27c, 27d, 29a, 29b are arranged and attached to the housing 5 side. The handle side wiring block 51 is provided with insertion ports 30a and 30b for connection terminals and lead wires 15 and 16 and is attached to the handle body 1 side.

As shown in FIG. 8 (a), the terminals 27a, 2
7c and 29a are provided at each end of each branch piece of one T-shaped blade-shaped conductor T ₁ . Similarly, the terminal 27b, 27d, 29 b are also provided on each end of a single blade-like each branch piece of conductor T ₂ of the T-shaped.
The two sheets T ₁ and T ₂ are integrally incorporated in the insulator 26 to form a housing side wiring block 50.

Further, as shown in FIGS. 8B and 9, the terminal insertion port 30 provided in the handle side wiring block 51.
a and b are crimped to the ends of the lead wire 15 connected to the switch 2 and the lead wire 16 connected to the pillar terminal 11, respectively.

Terminals arranged on the housing side wiring block 50 Terminals 27a, 27b, 27c, 27d, 29a,
Of the terminals 29b, the terminals 27a and 27b are connected to the lead wires 13 and 14 of the stator 12, and the terminals 27c and 27d are connected to the lead wires 53 and 54 of the noise prevention element 52.
9a and 29b are connected to the insertion ports 30a and 30b of the connection terminal of the handle side wiring block 51, respectively.

Of these connections, the terminals 27a, 2
7b and the lead wires 13 and 14 of the stator 12 and the terminals 29a and 29b and the insertion ports 30a and 30b are insertable in consideration of assemblability. The edges of 27b, 29a, and 29b form edge portions, respectively.

Next, the assembly of the electric hammer drill will be described.

First, in the same manner as in [Embodiment 1], the wiring inside the handle body 1 is completed, the handle cover 4 is attached to the handle body 1, and the handles 17 and 18 are fixed.

Next, the handle side wiring block 51 is attached to the wiring block housing portion 1a of the handle body 1.
At this time, as shown in FIG. 6, lead wires 15 and 16 are bent and connected to the switch 2 and the pillar terminal 11 by about 90 degrees.

In this way, the connection is made by bending at an acute angle, in the state where the housing side wiring block 50 and the handle side wiring block 51 are fitted, the space between the handle side wiring block 51 and the wiring block housing portion 1a. Play caused by C, that is, the handle side wiring block 5
1 and the housing-side wiring block 50, the restoring elastic force generated by bending the lead wires 15 and 16 connected to the switch 2 and the pillar terminal 11, and the elastic force of the covering material of the lead wire. This is because it will be eliminated by.

Next, the terminals 27a and 27b of the housing side wiring block 50 are respectively connected to the lead wire 1 of the stator 12.
3, 14 and terminals 27c and 27d of the wiring block 50
Is connected to the lead wires 53 and 54 of the anti-noise element 52 and is attached to the housing 5.

When the handle body 1 is engaged with the housing 5, the terminals 29 of the housing side wiring block 50 are connected.
And the terminal insertion port 30 of the handle side wiring block 51 are fitted, the connection between the handle body 1 side and the housing 5 side is completed, and these are fixed with screws 21, 22, 23.

With the above-described structure, the wiring work can be separately performed on the housing 5 side and the handle body 1 side, so that the lead wires 13 and 14 of the stator 12 and the lead wires 53 and 54 of the noise prevention element 52 can be connected. The lead wires 15 and 16 connected to the switch 2 and the pillar terminal 11 can be made to have a necessary minimum length.

Further, the switch 2 and the pillar terminal 11
Since the housing-side wiring block 50 and the handle body-side wiring block 51 are connected without rattling due to the elastic force of the lead wires 15 and 16 connected to, the disconnection of these lead wires due to the vibration of the electric tool body should be prevented. You can

In this embodiment, the housing side wiring block 50 is made of a T-shaped blade-shaped conductor, but the handle side wiring block 51 is made of a T-shaped blade-shaped conductor. But of course it doesn't matter.

[0074]

As described above, according to the configuration of the present invention, the life of the electric power tool is improved, the assembling / disassembling and repairing properties are improved, and the required functions are satisfied in the minimum space, so that the electric power tool can be provided. It is possible to provide a wiring connection structure that can be miniaturized.

More specifically, according to the configuration of the invention of claim 1, the housing side wiring block having the terminal for connecting the lead wire of the stator, the switch and the lead wire of the power cord are connected. A handle side wiring block having terminals is provided, and both wiring blocks are engaged with each other via the respective terminals, so that the lead wire is shortened, and the lead wire is caused by vibration when using an electric tool. It has the effect of preventing disconnection.

According to the structure of the second aspect of the present invention, the projections are provided on the side surfaces of both wiring blocks, and the recesses or the through holes that engage with the projections are provided on the side walls of both wiring block housings. However, since the elastic member is used for both the members, when the protrusion and the recess or the through hole are engaged, there is an effect that the engagement is not disengaged by the elastic deformation action.

According to the structure of the third aspect of the invention, since the tapered portion is formed on the protruding portion, the protruding portion can be smoothly engaged with the recess or the through hole portion, and the effect of improving the assemblability can be obtained. is there.

According to the fourth aspect of the invention, the wiring block having the terminals for connecting the lead wire of the stator and the lead wire of the noise prevention element is attached to the housing side, and the lead is connected to the switch and the power cord. A wiring block having terminals for connecting wires is attached to the handle side, and both wiring blocks can engage with each other when the wiring block is attached to the housing through the respective terminals. Even when the electric power tool is provided, the lead wires to be connected are shortened, and there is an effect of preventing disconnection of these lead wires due to vibration of the electric power tool itself when using the electric power tool.

According to the fifth and sixth aspects of the invention, each terminal of the wiring block is composed of one blade, each lead wire of the switch and power cord is bent at an acute angle, and each lead wire is covered. An elastic material is used as the material, and the elastic force of the elastic material has an effect of matching the mutual engagement of the terminal portions of the two wiring blocks, eliminating so-called play, and improving the life of the electric tool.

[Brief description of drawings]

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

FIG. 2 is a vertical cross-sectional view before the handle is fitted to the housing in the wiring connection structure of the electric hammer drill of FIG.

FIG. 3 is a perspective view of a wiring block in the wiring connection structure of FIG.

FIG. 4 is a perspective view of a wiring block in a wiring connection structure for an electric hammer drill according to another embodiment of the present invention.

5 is a sectional view taken along line AA ′ of the wiring block portion of FIG. 4 incorporated in the electric hammer drill.

FIG. 6 is a vertical cross-sectional view of a wiring connection structure of an electric hammer drill according to another embodiment of the present invention.

7 is a cross-sectional view of a wiring block of the wiring connection structure of FIG.

FIG. 8 is a perspective view of a wiring block of the wiring connection structure of FIG.

9 is a schematic cross-sectional view of the terminal portion of FIG.

FIG. 10 is a perspective view of a handle of a commonly used electric hammer drill.

FIG. 11 is a vertical cross-sectional view of a wiring connection structure of an electric hammer drill in the related art.

FIG. 12 is a vertical cross-sectional view of a wiring connection structure of an electric hammer drill having a noise prevention element according to a conventional technique.

[Explanation of symbols]

1 is a handle main body, 1a is a handle side wiring block housing portion, 2 is a switch, 3 is a power cord, 4 is a handle cover, 5 is a housing, 6 is a power cord cord clip, 7 is a screw, and 8 and 9 are power cords. Lead wire, 11 is a pillar terminal, 12 is a stator of an electric motor, 13 and 14
Is a lead wire of a stator, 15 is a lead wire connected to a switch, 16 is a lead wire connected to a pillar terminal,
Reference numerals 17 and 18 are screws, 19 and 20 are electric wire connecting connectors, 21 and 22 and 23 are screws, 24 and 24a are housing side wiring blocks, 25 and 25a are handle side wiring blocks, and 26 and 26 'are insulators. T ₁ and T ₂ are housing-side wiring block T-shaped blade-shaped conductors, 27 is a terminal for connecting the housing-side wiring block, 27 a and b are terminals for connecting the housing-side wiring block, and 27 c and d are housing-side wiring blocks. Connection terminals, 28.28a, b are connection terminals for the housing side wiring block, 29.29a, b
Is a terminal for connecting the wiring block on the housing side, 30, 30
a and b are insertion ports for connecting terminals of the handle side wiring block, 31 and 32 are connection electric wires, 33.34, 39 and 40 are protrusions, 35, 36, 41 and 42 are side walls, and 37 and 38 are square holes. 43, 44 are long groove portions, 45-48 are tapered portions, 5
Reference numeral 0 is a housing side wiring block, 51 is a handle side wiring block, 52 is a noise prevention element, 53 and 54 are noise prevention element lead wires, and C is a space between the wiring block 51 and the storage portion 1a.

Claims (6)

[Claims] 1. A tool holding part for holding a tip tool, a power transmission part for transmitting power to the tool holding part, a housing for accommodating an electric motor as a drive source, and a switch for starting or stopping the electric motor. And a handle to which a power cord is attached, wherein the electric motor is electrically connected to the switch and the power cord, and the handle is attached to the housing. One wiring block formed of an insulator having a connection terminal with a wire is attached to the housing side, and another wiring block formed of an insulator having a connection terminal with a lead wire of the switch and the power cord. By attaching the wiring block to the handle side and attaching the handle to the housing, they are engaged with each other and electrically connected. A wiring connection structure for an electric power tool, characterized in that terminals to be connected are provided on both of the wiring blocks. 2. The wiring connection structure for an electric power tool according to claim 1, wherein a protrusion is provided on a side surface of each of the wiring blocks, and a recessed portion that engages with the protrusion is provided on a sidewall of each of the wiring block housings. A wiring connection structure for an electric tool, characterized in that any one of the through holes is provided and an elastic material is used for both the members. 3. The wiring connection structure for an electric power tool according to claim 1, wherein the protrusion has a tapered portion. 4. A tool holding part for holding a tip tool, a power transmission part for transmitting power to the tool holding part, an electric motor serving as a drive source, and an electric connection between the electric motor and the electric motor. The electric motor and the noise prevention element, the switch, and the power supply, the housing including a noise prevention element that reduces electrical noise, and a handle that accommodates a switch for starting or stopping the electric motor and has a power cord attached thereto. In a wiring connection structure of an electric tool for electrically connecting to a cord and for attaching the handle to the housing, a lead wire of a stator of the electric motor and a lead wire of the noise prevention element are formed by an insulator. One of the above wiring blocks is attached to the housing side and has a connecting terminal for the switch and the lead wire of the power cord, and is formed of an insulator. One wiring block is attached to the handle side, and the handle is attached to the housing, whereby terminals that engage with each other and are electrically connected are provided on the both wiring blocks, respectively. Wiring connection structure for electric tools. 5. The wiring connection structure for an electric power tool according to claim 4, wherein either one of the wiring block on the housing side or the other wiring block on the handle side is formed of a blade conductor. A characteristic wiring connection structure for electric tools. 6. The wiring connection structure for an electric tool according to claim 1, 2, 3, 4, or 5, wherein the lead wires of the switch and the power cord are bent at an acute angle, and the lead wires are covered. A wiring connection structure for an electric tool, characterized in that an elastic material is used as a material, and the mutual engagement of the terminals of the two wiring blocks is matched by the restoring force of the lead wire and the elastic force of the elastic material. .