JP2001229895A - Battery pack and motor tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for enhancing the durability of the tool through raising a hook strength. SOLUTION: A hook 20 of synthetic resin installed to avoid loosening in the process of mounting to the battery pack 1, is housed in the back of the external case with the flexible movement in the direction up and down, and driven upward through a coil spring 25. At the upper end of the hook 20, a claw 21 is arranged, while in the middle of the claw 21, a reinforcing metal plate 23 is fitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a battery having a built-in storage battery,
The present invention relates to a battery pack mounted on an electric device and used as a power source, and an electric tool to which the battery pack can be mounted.

[0002]

2. Description of the Related Art In the above-mentioned battery pack, there is a type in which a parallel slide rail is protruded as a mounting portion on an upper surface of a case containing a storage battery, while a mounting end is mounted on a lower end of a handle of a power tool as electric equipment. A guide rail capable of holding a slide rail is protruded as a part. Therefore, when the battery pack is mounted on the power tool, the slide rail is fitted between the guide rails and slid along the guide rails, whereby the battery pack can be mounted. Simultaneously with mounting, the positive / negative charging / discharging terminals provided on the upper surface of the case of the battery pack come into contact with the terminals on the power tool side, and the two are electrically connected.

[0003]

In order to prevent the battery pack from being detached in the mounted state, a hook is provided on the upper surface of the case so as to be protruded and urged, and an engaged portion formed on the power tool is provided. And the like. Therefore, when the hook is in the engaged state with the recess, an external force is applied to the hook against the load in the detaching direction of the battery pack. However, since the hook is usually made of a synthetic resin, the external force may cause wear and damage to the hook. The same applies to the power tool side. If the concave portion is made of synthetic resin, an external force due to the contact of the hook with the concave portion may cause wear or damage. In particular, electric tools such as drills and hammers are more likely to generate vibrations, so that there is a greater risk of mutual wear and the like.

Accordingly, an object of the present invention is to provide a battery pack capable of increasing the strength of a hook, preventing the occurrence of wear and damage, and improving durability. . Similarly, another object of the present invention is to provide a power tool that can increase the strength of an engaged portion to prevent the occurrence of wear and damage and improve durability. is there.

[0005]

According to a first aspect of the present invention, a metal reinforcing plate is attached to at least a contact portion of the hook with an electric device. It is a feature. In order to achieve the above object, the invention according to claim 2 is characterized in that a metal second reinforcing plate is attached to at least a contact portion of the engaged portion with a hook. is there.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of the battery pack, and FIG. 2 is an exploded perspective view. The battery pack 1 is a box body containing a plurality of storage batteries (hereinafter, referred to as “cells”). It has a double structure that accommodates a slightly smaller inner case 10 that covers the cell. The outer case 2 includes a lower case 3 in which the inner case 10 is substantially accommodated, and an upper case 4 attached with screws from above the lower case 3. ,
A base end portion 5 and two parallel slide rails 6 and 6 projecting forward from the base end portion 5 (hereinafter, the base end portion 5 is referred to as a rear side in the battery pack 1) are formed. . The slide rails 6, 6 each have an inverted L-shape in cross section provided with projecting portions 7, 7 on the outside, and a base end 5 between the slide rails 6, 6 is parallel to the slide rail 6. .. Are formed. Reference numerals 9 and 9 denote stoppers formed outside the slide rails 6 and 6 at the base end 5, respectively.

The inner case 10 includes an upper holder 12 and a lower holder 13 which are respectively attached to 20 cells 11, 11... Arranged in four rows of five each, and upper and lower holders 12, 13.
Are arranged between the upper and lower holders 12, 13 and the heat radiating plate 14, and the cell 11 is housed in a substantially sealed state. 15 is the upper holder 1
A charge / discharge terminal 16, 16 is disposed on the left and right on the substrate 15, and the positive / negative of the cell 11 exposed through the upper holder 12 by the lead plates 17, 17 is provided. And are electrically connected to each other. Further, between the charge / discharge terminals 16, 16 on the substrate 15, a temperature detection terminal 18 and a connector-shaped communication terminal 1 are provided.
9 are arranged, and in the state of being housed in the outer case 2,
The charging / discharging terminals 16, 16 and the temperature detecting terminal 18 face the outside via the slits 8, 8,... Of the upper case 4, and the communication terminal 19 is exposed forward.

Then, behind the battery pack 1,
A hook 20 made of a synthetic resin is provided. Hook 20
As shown in FIG. 3, is accommodated movably up and down behind the outer case 2 and is urged upward by a coil spring 25. At the upper end of the hook 20, a flat U-shaped claw 21 is formed, and the front surface of the claw 21 is formed as an inclined surface that becomes lower as going forward, and an intermediate portion between the U-shaped ends of the claw 21 is formed. A metal reinforcing plate 23 bent along the shape of the intermediate portion 22 is fitted to the middle 22 from the rear surface to the inclined surface. On the rear surface of the hook 20, an operating portion 24 having a concave center is projected from a notch 26 formed in the lower case 3, and the operating portion 24 comes into contact with the lower end of the upper case 4 so that a coil spring is formed. 25 restricts the position of the hook 20 projecting upward. In this protruding position, the pawl 21 protrudes from a U-shaped through hole 27 formed in the upper case 4.

FIG. 4 is an explanatory view of a handle of an electric tool to which the battery pack 1 is mounted. A handle 30 made of synthetic resin is assembled with a half-split housing which is divided into two parts in the vertical direction, On both sides, guide rails 31, 31 as mounting parts are formed at intervals slightly wider than the width including the projecting parts 7, 7 of the slide rails 6, 6 in the battery pack 1, and the guide rails 3 are formed.
Overhanging portions 32, 32 extend substantially over the entire length of the opposing side surfaces of the members 1, 31, respectively. Further, in front of the bottom surface of the handle 30 (the handle 30 will be described with the left side in FIG. 4 as the front), as a to-be-engaged portion with which the claw 21 of the hook 20 can be engaged when the battery pack 1 is mounted. A recess 33 is formed. The recess 33 is located on the front wall 3
4 is formed on a surface orthogonal to the guide rail 31, and a rear wall 35 is formed on an inclined surface that becomes shallower as going rearward. A reinforcing piece of a support plate 36 as a second reinforcing plate is formed on the front wall 34. 37 is in contact. The support plate 36 is a flat T-shaped plate made of metal and fixed along the bottom surface of the handle 30.
Is formed over the entire length of the concave portion 33 in the left-right direction, and closely adheres to the wall 34 in an assembled state. on the other hand,
Reference numeral 38 denotes a terminal block, which is assembled to the bottom surface of the handle 30 in the same manner as the support plate 36. Positive and negative terminal plates 39, 39 are provided on both lower ends at the same intervals as the charge / discharge terminals 16, 16 of the battery pack 1. It is projected in parallel with.

[0010] The battery pack 1 configured as described above.
When the front ends of the slide rails 6 and 6 are applied between the guide rails 31 and 31 in front of the handle 30 and the battery pack 1 or the handle 30 is fixed and one of the slides is slid to the front, Of the guide rails 31, 31
It moves forward while being held by 2,32. Then, the claw 21 of the hook 20 comes into contact with the front end of the handle 30, but the claw 2
Since the front surface of the battery pack 1 is inclined, as shown by a two-dot chain line in FIG.
Is immersed in the outer case 2 and does not hinder the advance of the battery pack 1. Then, the battery pack 1 stops at a position where the stoppers 9, 9 of the upper case 4 abut on the front ends of the guide rails 31, 31, but at the same time, the hook 20 is moved by the coil spring 25 because the claw 21 reaches the concave portion 33 of the handle 30.
And the claw 21 is engaged with the recess 33. Therefore, as shown by a solid line in FIG.
0 is attached. At this time, a load pressed against the reinforcing piece 37 is applied to the nail 21 by preventing the battery pack 1 from coming off. However, since the reinforcing plate 23 is fitted to the nail 21, the nail 21 There is no danger of wear or damage to 21. When the battery pack 1 is mounted, the terminal plates 39, 39 of the handle 30 enter the slits 8, 8 on the upper part of the battery pack 1, respectively, to charge / discharge the terminals 16, 16.
And both are electrically connected.

On the other hand, when removing the battery pack 1, a finger is
When the battery pack 1 is pushed down against the bias of the coil spring 25, the engagement between the claw 21 and the concave portion 33 is released. The electrical connection is released by separating from the slits 8 and 8, and the slide rails 6 and 6 are
When the battery pack 1 is removed from the battery pack 1, the removal of the battery pack 1 is completed.

As described above, the battery pack 1 of the above embodiment
According to this, the metal reinforcing plate 23 is attached to the contact portion of the hook 20 with the concave portion 33 in the claw 21, so that the claw 21
Since the strength of the hook 20 is increased, the durability of the hook 20 is improved,
Battery pack 1 to be attached to a power tool that generates vibration
However, there is no risk of wear or damage. Further, according to the power tool of the above-described embodiment, the strength of the concave portion 33 is increased by attaching the reinforcing piece 37 of the support plate 36 as the second reinforcing plate to the abutting portion of the claw 21 in the concave portion 33 of the handle 30. As a result, the durability of the handle 30 is improved, and even if the power tool generates vibration, there is no risk of wear or damage.

The hook 20 is reinforced by the reinforcing plate 23.
However, the strength of the claw 21 engaging with the recess 33 is increased by providing the claw 21 only on the rear surface portion of the claw 21 that is in contact with the recess 33 side or by making the entire claw 21 of metal. If so, the design can be changed as appropriate. The same applies to the concave portion 33 side. If necessary fixation in the handle 30 is possible, the entire support plate may be omitted and only the reinforcing piece 37 may be used, or the entire wall of the concave portion 33 may be made of metal. The design can be changed as appropriate. On the other hand, the structure of the hook is not limited to the projecting bias as in the above-described embodiment, and the present invention can be applied to a mode in which the hook is manually operated by operating a lever or the like. Further, in the above-described embodiment, the type in which the battery pack is slid in the direction orthogonal to the handle and attached / detached has been described. However, even in the type in which the mounting portion of the battery pack is inserted toward the handle, a hook is used as a retainer. If so, it is possible to employ a reinforcing plate or a second reinforcing plate.

[0014]

According to the first aspect of the present invention, a metal reinforcing plate is attached to at least a portion of the hook in contact with the electric device, so that the strength of the hook is increased and the durability is improved. Even if the battery pack is mounted on a power tool or the like that is improved and generates vibration, there is no risk of wear or damage, and the reliability in the mounted state is improved. According to the invention described in claim 2, by attaching the second reinforcing plate made of metal to at least the contact portion of the engaged portion with the hook,
The strength of the engaged portion is increased, and the durability of the attached portion is improved. Even if the power tool generates vibration, there is no danger of wear or damage, and the reliability of the battery pack in the mounted state is improved. .

[Brief description of the drawings]

FIG. 1 is a perspective view of a battery pack.

FIG. 2 is an exploded perspective view of the battery pack.

FIG. 3 is a longitudinal vertical sectional view of a battery pack.

FIG. 4 is an explanatory view of a handle of the power tool (the upper side shows a left side surface, and the lower side shows a bottom surface, respectively).

FIG. 5 is an explanatory diagram of a mounted state of a battery pack.

[Explanation of symbols]

1. Battery pack, 2 outer case, 6 slide rail, 10 inner case, 20 hook, 21
..Claws, 23..Reinforcing plates, 25..Coil springs, 30.
・ Handle, 31 ・ ・ Guide rail, 33 ・ ・ Recess, 3
6. Support plate, 37. Reinforcement piece.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takayasu Kuroyanagi 3-11-8 Sumiyoshicho, Anjo-shi, Aichi F-term (reference) in Makita Corporation 5H040 AA07 AA36 AS19 AT01 AY08 AY12 CC13 JJ03 LL01 LL06

Claims (2)

[Claims] 1. A case in which a storage battery is accommodated, a mounting portion detachable to an electric device is formed, and a hook made of a synthetic resin is engageable with the electric device in a state of being mounted on the electric device. A battery pack characterized in that a metal reinforcing plate is attached to at least a contact portion of the hook with the electric device. 2. A synthetic resin material comprising a mounting portion to which the battery pack according to claim 1 can be mounted, wherein a hook of the battery pack can be engaged with the mounting portion when the battery pack is mounted. An electric tool having an engaged portion, wherein a metal second reinforcing plate is attached to at least a contact portion of the engaged portion with the hook.