JP2000296480A - Electrode terminal connecting structure of rechargeable power tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrode terminal connecting structure of a rechargeable power tool being resistant against contact failure and being easy to change an electrode terminal and assembly to a housing. SOLUTION: An electrode terminal holding tool 20 is extended to a connecting part of a switch body 4 and electrode terminals 4a, 4b while an extending part 22 is formed with female screw member accommodating parts 20a, 20b for detent and accommodation of female screw members 7, 7, and the switch body 4 and the electrode terminals 4a, 4b are detachably connected with using the female screw members 7, 7 and male screw members 8, 8 at a position of the female screw member accommodating parts 20a, 20b. Claws 5a, 5a, 5a, 5a for holding the electrode terminals 4a, 4b are also formed near the female screw member accommodating parts 20a, 20b on the extending part 22. Moreover, elastic bodies 9, 9 formed on a rib of a handle housing 2 are abutted to a head part of the male screw members 8, 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a structure for connecting electrode terminals of a rechargeable power tool.

[0002]

2. Description of the Related Art A conventional electrode terminal connection structure will be described with reference to FIGS. In the electrode terminal connection structure of the rechargeable power tool shown in FIG. 3, the handle housing 2 is formed by combining the housing pieces 2a and 2b. A switch body 4 that is turned on and off by a trigger (not shown) is held and held in the handle housing 2 by ribs 2c... 2c formed on the handle housing 2. Electrode terminals 3a and 3b held at predetermined positions by electrode terminal holders 100 are fixed to switch terminals 4a and 4b provided on switch body 4 by caulking pins. The electrode terminal holder 100 is held on the handle housing 2 by a rib (not shown) formed on the handle housing 2. The battery 13 is inserted from below the electrode terminals 3a and 3b, locked by a locking portion (not shown), and the electrode terminals 3a and 3b are brought into contact with the battery terminals 13a and 13b to be electrically connected.

In the electrode terminal connection structure of the rechargeable power tool shown in FIG. 4, the switch terminals 4a, 4b of the switch body 4 and the electrode terminals 3a, 3b are connected using hexagon nuts 7, 7 and small screws 8, 8. ing. Other configurations are the same as those in FIG.

[0004]

The electrode terminals are oxidized due to a rise in temperature, and wear occurs due to friction with the battery terminals during attachment / detachment. When the electrode terminal is oxidized or worn, the conductivity is reduced, and when the electrode terminal is severely worn, the terminal is broken. Therefore, it is necessary to replace the electrode terminal. But,
In the electrode terminal connection structure shown in FIG. 3, since the switch terminal and the electrode terminal are connected by caulking, it is necessary to remove the caulking in order to replace the electrode terminal, and it is extremely difficult to replace the electrode terminal.

A method of connecting a switch terminal and an electrode terminal with a hexagon nut and a small screw as in the electrode terminal connection structure of FIG. 4 or a female screw portion formed in a switch as disclosed in Japanese Patent Application Laid-Open No. 9-76174. In the connection method, since there is no electrode terminal holding part near the connection part, the vibration of the electrode terminal during operation of the power tool is large and the electrode terminal is easily deformed, so the screw part may be loosened due to vibration and Deformation of the electrode terminals occurred therein, and poor contact between the electrode terminals and the battery terminals often occurred.

In addition, since the conventional electrode terminal holder is only held and held by the housing, when connecting the electrode terminal with the electrode terminal holder attached to the switch body and assembling it into the handle housing, the electrode terminal holder is held. The tool moved and the positioning was difficult, and the assembling work was troublesome.

Therefore, the present invention is less likely to cause poor contact,
It is an object of the present invention to provide an electrode terminal connection structure of a rechargeable power tool that can be easily replaced with an electrode terminal or incorporated into a housing.

[0008]

Hereinafter, the present invention will be described. In addition, in order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are added in parentheses, but the present invention is not limited to the illustrated embodiment.

According to the first aspect of the present invention, the electrode terminal holder (2)
0) is extended to the connection portion between the switch body (4) and the electrode terminals (4a, 4b), and the female screw member storage part ( 20a, 20a) are formed, and the switch body and the electrode terminal are detachably connected to the female screw member and the male screw member (8, 8) at the position of the female screw member storage portion.

According to a second aspect of the present invention, in the electrode terminal connection structure for a rechargeable power tool according to the first aspect, the extension portion (22).
Claw portions (5, 5) for holding the electrode terminals (4a, 4b) are formed in the vicinity of the female screw member accommodating portions (20a, 20a).

According to a third aspect of the present invention, in the electrode terminal connection structure of the rechargeable power tool according to the first or second aspect, a rib of the handle housing (2) is formed at the head of the male screw member (8, 8). The elastic body (9, 9) is abutted.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an explanatory view showing a connection structure of an electrode terminal according to the present invention.
It is a partial section. ). FIG. 2 is a side view of the electrode terminal holder of the present invention as viewed from the X direction in FIG. 1.

The electrode terminal holder 20 of the present invention has a
1 and an extension portion 22, and female screw member storage portions 20 a, 20 having a hexagonal cross section are formed on end side surfaces (connection portions) of the extension portion.
a is formed, and the female screw member storage portions 20a, 20a have
Hex nuts 7, 7 as female screw members are mounted so as not to rotate. Also, the extension 2 of the electrode terminal holder 20
2 is provided with a pair of protruding claws 5, 5. At the ends of the claws 5, grooves 20 c, 20 c for holding the electrode terminals 3 a, 3 b at a predetermined interval, and Claw 5 for holding electrode terminals 3a, 3b in grooves 20c, 20c
a, 5a, 5a, 5a are formed. Similarly, at both ends of the base end 21, grooves 20e, 20e for holding the electrode terminals 3a, 3b at predetermined intervals, and the electrode terminals 3a, 3b.
claw 10 for holding a, 3b in grooves 20e, 20e
a, 10a, 10a, 10a are formed. The electrode terminals 3a, 3b are held at predetermined intervals by the grooves 20e, 20e of the base end 21 and the grooves 20c, 20c of the extension 22, and small screws 8, 8 (male) are attached to the switch terminals 4a, 4b of the switch body 4. (Screw member) and hexagon nuts 7, 7. The switch terminals 4a, 4b and the electrode terminals 3a, 3b are formed with insertion holes through which small screws 8, 8 can be inserted.

The electrode terminal holder 20, the electrode terminals 3a, 3b, and the switch main body 4 assembled in this manner include the switch main body 4 having ribs 2c.
And the electrode terminal holder 20 is held by a rib (not shown) of the handle housing 2 so that the
Will be incorporated within. When assembled, the elastic members 9 mounted on the bosses 11 of the handle housing 2 abut against the heads of the small screws 8. When the elastic members 9, 9 press the heads of the small screws 8, 8, loosening of the small screws 8, 8 due to vibration of the rechargeable power tool is prevented. The elastic members 9, 9 are fitted into insertion holes 11a, 11a formed at the tips of the bosses 11, 11, respectively. The battery 13 is connected to the electrode terminals 3a and 3b.
Are mounted, and the electrode terminals 3a and 3b and the battery terminal 13
The contacts 13a and 13b are in contact with each other to establish an electrical connection between the rechargeable power tool and the battery 13.

In the above-described embodiment, the female screw member storage portions 20a, 20a are formed in a hexagonal cross section, and the female screw members also use the hexagon nuts 7, 7 to prevent the hexagon nuts 7, 7 from rotating. However, as the shapes of the female screw member storage portions 20a, 20a and the female screw member, any shape that can be prevented from rotating, such as a rectangular shape or an oval shape, can be adopted. Further, in the above embodiment, the hexagon nuts 7, 7 and the female screw member storage portions 20a, 20a of the electrode terminal holder 20 are formed separately, but the electrode terminal holder 20 and the hexagon nuts 7, 7 are connected to the electrode terminal. The holder may be integrally molded at the time of molding. Similarly, in the above embodiment, the elastic members 9 and 9 are manufactured separately from the housing 2, and the insertion holes 11a and 11b of the boss portions 11 and 11 of the handle housing 2 are formed.
11a, but may be integrally molded when the handle housing 2 is molded. By integrally molding in this way, the assembling work can be more easily performed.

[0016]

As described above, according to the first aspect of the present invention, since the electrode terminal and the switch terminal are detachably attached by the male screw member and the female screw member, the electrode terminal is worn. Even when replacement is required, for example, the electrode terminal and the switch terminal can be easily disassembled and assembled. When the electrode holder, the switch body, and the electrode terminal are assembled in the handle housing, the switch body and the electrode terminal are fixed to the electrode terminal holder, and these assembly parts are integrated, so that the assembling work can be easily performed. Further, since the female screw member is locked and received in the female screw member housing portion, the female screw member can be prevented from loosening, and the contact failure between the electrode terminal and the battery terminal due to the movement of the electrode terminal can be prevented.

According to the second aspect of the present invention, since the vicinity of the female screw member accommodating portion of the electrode terminal is held by the claw portion of the electrode terminal holding member, vibration of the electrode terminal can be reduced and deformation of the electrode terminal can be prevented. It is possible to prevent the contact failure between the electrode terminal and the battery terminal more reliably.

Further, according to the third aspect of the present invention, since the elastic member formed on the rib of the handle housing is pressed against the head of the male screw member and brought into contact with the head, the elastic member rotates the male screw member. Thus, loosening of the screw member can be prevented more reliably, and poor contact between the electrode terminal and the battery terminal can be more reliably prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an electrode terminal connection structure to which the present invention is applied.

FIG. 2 is a side view of the electrode terminal holder of the electrode terminal connection structure to which the present invention is applied, as viewed from the X direction in FIG.

FIG. 3 is a sectional view showing a conventional electrode terminal connection structure.

FIG. 4 is a sectional view showing a conventional electrode terminal connection structure.

[Explanation of symbols]

 2 Handle Housing 2a, 2b Housing Piece 2c Rib 3a, 3b Electrode Terminal 4 Switch Body 4a, 4b Switch Terminal 5 Claw 5a Claw 7 Hex Nut 8 Machine Screw 9 Elastic Member 10a Claw 11 Boss 11a Insertion Hole 13 Battery 13a, 13b Battery terminal 14 Caulking pin 20 Electrode terminal holder 20a Female screw member storage 20c, 20e Groove 21 Base end 22 Extension 100 Electrode terminal holder

Claims (3)

[Claims] A female screw member accommodating portion for extending the electrode terminal holder to a connection portion between the switch body and the electrode terminal, and forming a female screw member in the extended portion so as to prevent the female screw member from rotating;
An electrode terminal connection structure for a rechargeable power tool, wherein a switch body and an electrode terminal are detachably connected by the female screw member and the male screw member at the position of the female screw member storage portion. 2. The electrode terminal connection structure for a rechargeable power tool according to claim 1, wherein a claw portion for holding an electrode terminal is formed near said female screw member storage portion of said extension portion. 3. The electrode terminal connection structure for a rechargeable power tool according to claim 1, wherein an elastic body formed on a rib of the handle housing is brought into contact with a head of the male screw member.