JPH09155769A - Battery mounting structure for power tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent battery package from being locked in the battery type power tool. SOLUTION: In a concrete vibrator, a charging type battery package 19 is housed in the lower part of a handle housing 17. The battery package 19 is hanged up to the opening part of the handle housing 17 with a hook 75. A battery over 80 is mounted thereto in such a way that it covers the battery cover 19. A seal member 85 in a L shape in cross section made of rubber is mounted onto the upper end periphery of the battery cover 80. Besides, the battery cover 80 is supported by a turning fulcrum 81 with respect to the handle housing 17, and is also hanged over by hooking a pawl 83 to a flange part 17c projected out of the handle housing 17 at the opposite side of the fulcrum 81.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery mounting structure for a battery-driven power tool.

[0002]

2. Description of the Related Art Power tools are often used in a lot of dust such as construction sites. And in recent years, since the capacity of the rechargeable battery has been improved, a large number of battery-powered electric tools have come to be seen.

Such batteries are usually packaged and can be removed from the tool for charging. For example, as shown in Japanese Utility Model Laid-Open No. 5-48214 and Japanese Utility Model Publication No. 3-21906, there are many methods in which a hook of a battery package is hooked and fixed to a lower end opening edge of a handle housing.

[0004]

However, as described above, since such an electric power tool is used in a dusty environment, dust enters through the gap between the handle housing and the battery package and enters the inside of the hook. , It may not be possible to compress the hook. Therefore, the battery package may not be removable.
Further, in the case of working outdoors, there is a problem that rainwater may enter through the gap between the battery and the housing, which adversely affects the electric parts housed inside the electric tool.

Therefore, according to the present invention, in a battery-powered tool, the battery package can be easily attached to and detached from the tool even when working outdoors or in a bad working environment where there is a lot of dust. It is an object of the present invention to provide a battery mounting structure that can easily prevent the intrusion of electricity.

[0006]

Means for Solving the Problems, Embodiments of the Invention and Effects of the Invention In order to solve the above problems, a battery mounting structure for an electric power tool according to the present invention is a battery-operated electric power tool, in which a battery package is installed in a housing. It is characterized in that, after being inserted through the opening, a cover is attached to the opening so as to cover the battery package. In this case, it is preferable that the opening edge of the cover and the opening edge of the housing are made to abut against each other, and a seal member is provided on the abutting surface.

According to this battery mounting structure, since the cover is attached to the opening of the housing, external dust or the like does not enter the housing. Therefore, there is no possibility that the battery package cannot be removed due to dust clogging. Here, the cover is attached so as to be rotatably supported with respect to the housing, and is configured to be hooked from the outside to a flange portion protruding outward from the housing on the side opposite to the fulcrum of rotation. It is good to have By doing so, even when the cover is opened, it is not necessary to push the member inward, and even if the hanging portion is clogged with dust or the like, the cover will not be opened.

The seal member may be attached to the edge of the cover so as to cover a part of the outer surface of the cover. In this way, even if the electric tool is laid down sideways, it serves as a cushion, and the electric parts inside the electric tool can be protected from vibration.

[0009]

Next, an embodiment of the invention will be described based on a battery-type concrete vibrator as an example. As shown in FIG. 1, the concrete vibrator 10 of the embodiment is configured to vibrate a long vibrating rod 15 by a DC motor 13 in a motor housing 11 to perform compaction of a ready-mixed concrete. The power of the DC motor 13 is
The power is supplied by a rechargeable battery package 19 stored in a lower portion of the handle housing 17. Note that the motor housing 11 and the handle housing 17 have a half-split structure and should actually be represented as end faces, but are hatched in FIG. 1 for easy viewing.

The vibrating rod 15 has a flexible shaft 23 passed through a flexible hose 21, and an unbalancer 25 having an unbalanced center of gravity is attached to the end of the flexible shaft 23 via a joint 23a connected to the flexible shaft 23. The tip cap 27 is covered. The distal end portion of the joint 23a fixed to the unbalancer 25 with a screw is sealed by a ring-shaped seal member 30, as shown in an enlarged manner in FIG. This seal member 30 is formed by fitting a rubber ring 33 having a U-shaped cross section outside a felt ring 31 having a square cross section. The rubber ring 33 plays a role of reinforcing the felt ring 31 and the like. The seal member 30 prevents metal powder and the like generated by the contact between the inner surface of the flexible hose 21 and the outer surface of the flexible shaft 23 from biting into the ball bearing 35 supporting the rear side of the unbalancer 25. It has been done. Since the concrete vibrator 10 of the present embodiment is a battery type and is not suitable for a large load, the deterioration of the durability of the ball bearing 35 is prevented by such foreign matter biting.

On the lower surface 11a of the motor housing 11,
As shown in an enlarged manner in FIG.
2 is open. Further, on the front surface of the lower support 17a of the handle housing 17, cooling air exhaust ports 43 to 4 are provided.
5 is open. Baffle plates 47 and 48 for forming a labyrinth structure are attached inside the intake ports 41 and 42. The labyrinth structure formed by the baffle plates 47 and 48 prevents foreign matter from entering the motor housing 11.

In the motor housing 11, a ring-shaped plate 51 for supporting the rear end of the DC motor 13,
52 are provided. A loop-shaped passage 53 is formed by the ring-shaped plates 51 and 52 so as to surround the rear portion of the motor 13, and further, an exhaust passage 55 continuous from the lower end of the loop-shaped passage 53 to the exhaust ports 43 to 45 is formed. Have been. The exhaust passage 55 is provided with a baffle plate 57 that extends from the base of the handle housing lower support 17a.
The foreign matter and water droplets jump from 5 and do not enter the inside, and these foreign matter and the like are dropped to the exhaust port 43 at the base of the handle housing lower support 17a.

Further, among the ring-shaped plates 51, 53,
The front plate 51 also serves to partition the inside of the motor housing 11 into a front space 11b and a rear space 11c. The front space 11b is closed by a coupling fitting 60 attached to the front end opening 11d of the motor housing 11.

This coupling fitting 60 is used for the motor 13
And a second coupling fitting 65 having a ball bearing 63 built therein for bearing a spindle shaft 23b for fixing the flexible shaft 23 of the vibrating rod 15, and a first coupling fitting 61 for fitting the front end of the first coupling fitting. To be assembled. As described above, since the coupling fitting 60 is assembled by the intaglio connection, there are the following advantages.

The output shaft of the motor 13 and the spindle shaft 23b must be connected with their axes aligned. In this regard, if the first coupling fitting 61 is manufactured with high precision, the output shaft axis of the motor 13 can be accurately provided by the first coupling fitting 61. On the other hand, with respect to the axis of the spindle shaft 23b, if the second coupling metal fitting 65 is processed with high accuracy, the second coupling metal fitting 65 can also be obtained with high accuracy. Then, the first coupling fitting 61 and the second coupling fitting 6
If the inro joint part with 5 is processed accurately, the motor 1
The output shaft No. 3 and the spindle shaft 23b can be connected so that their axes coincide. By doing so, the axis of the output shaft of the motor 13 and the spindle shaft 23b can be accurately aligned. Such an improvement in the alignment accuracy also needs to be considered in manufacturing because the present embodiment is of a battery type and is not suitable for a large load.

Next, the air cooling mechanism in the concrete vibrator 10 of the embodiment will be described. First, the mounting state of the motor 13 to the first coupling fitting 61 will be described. As shown in FIG. 4, the first coupling fitting 61 is provided with two upper and lower flange-like projections 61a, and is fastened to the second coupling fitting 65 through screw holes 61b formed therein. It has become so. In addition, the first coupling fitting 61 is provided with four notches 61 so as to be in the same position as the front end opening 13 a of the motor 13.
c is provided. The first coupling metal fitting 61 is fastened to the motor 13 by inserting a screw into the left and right fool holes 61d in the drawing.

As a result, according to the concrete vibrator 10 of this embodiment, when the motor 13 is rotated, as shown in FIG.
As shown in FIG. 4, air is sucked in from the intake ports 41 and 42 by a fan mounted in the motor 13,
The motor 13 advances forward in the housing front space 11b and is sucked into the case 13b of the motor 13 through the notch 61c of the first coupling fitting 61 and the front end opening 13a of the motor 13.

Then, the air moves rearward in the motor case 13b, and the opening 1 provided above and below the rear portion of the motor.
3c and is discharged to the loop-shaped passage 53. Here, when the loop-shaped passage 53 is viewed from the front, as shown in FIG. 5, a horizontal partition plate 53a is provided only on one side, and the loop is closed halfway. Therefore, as shown by the arrow in the figure, the exhaust gas swirls in the loop-shaped passage 53 in only one direction and smoothly flows into the exhaust passage 55. Thereafter, the gas passes from the exhaust passage 55 to the exhaust ports 43 to 45 and is discharged to the outside.

Next, the detachable structure of the battery package 19 will be described. In the concrete vibrator 10 of the embodiment, as shown in FIG. 1, a rechargeable battery package 19 is mounted on a lower portion of a handle housing 17. As shown in FIG. 6, the battery package 19 contains a large number of battery cells 71 therein, and is electrically connected to the motor 13 by terminals 73 on the main body side in the handle housing 17. Further, as shown in FIG. 6, the handle housing 17 is attached by hooking a hook 75 on an inwardly projecting portion 17b of the lower end of the handle housing 17. The hook 75 has a leaf spring 77 inside. When the finger is pressed from the outside, it contracts and fends off the overhang 17b, and when the finger is released, it spreads by the action of the leaf spring 77 and is caught on the overhang 17b.

In this embodiment, this battery package 1
9, a battery cover 80 is further attached. As shown in FIG. 7, the battery cover 80 is rotatably supported by a rotation fulcrum 81 at the lower end of the handle housing lower support 17a. And the claw 83 which hooks on the flange part 17c of the lower end of the handle housing 17 on the opposite side is provided. The claw 83 has an inclined surface 83b above the hook portion 83a and has elasticity itself. Therefore, when the cover 80 is closed, the slope 83b is
c, and naturally falls down the nail 83 to the outside, and the hook portion 83a
When the arm rotates to a position that evades the flange 17c, the arm returns to an upright state by its own elasticity and is caught by the flange 17c. Then, when the cover 80 is opened, the claws 83 may be knocked out with a finger, removed from the flange portion 17c, and the cover 80 may be rotated.

A rubber seal member 85 is attached to the upper edge of the battery cover 80. Seal member 8
As shown in FIG. 6, the reference numeral 5 has an L-shaped cross section and covers the upper edge of the cover 80 and a predetermined area immediately outside the upper edge. Thereby, the tightness between the cover 80 and the handle housing 17 is enhanced.

Further, as shown in FIG. 7, the battery cover 80 is provided with a rib 87 on the pivot fulcrum side. This rib 87
Is for allowing a non-hook type battery package to be mounted. The battery package includes
In addition to the one employing the hook-type engagement / disengagement mechanism as employed in the embodiment, there is also one in which a set plate on the main body side is hooked on a convex portion on the battery package side and fixed.
In such a type of package, since the convex portion 91 is provided at a position indicated by a dotted line in FIG. 7A, a rib 87 is provided to support the convex portion 91 from below. Thus, any type of battery package can be used.

According to this embodiment described in detail above, since the above-mentioned structure is adopted, the following effects are exhibited. First,
Even if it rains when the concrete vibrator 10 is used, the intake ports 41 and 42 and the exhaust ports 43 to 45
Are not open facing upward, so that rainwater does not enter the motor housing 11. In addition, intake port 4
1 and 42 and the exhaust ports 43 to 45
Since it is provided near the base of 7, even if the front end of the motor housing is erroneously brought into contact with the ready-mixed concrete, air cooling is not impossible. In addition, since the labyrinth structure prevents foreign substances from being sucked in, water droplets and particles of the ready-mixed concrete scattered from the surface of the ready-mixed concrete do not remain in the housing, thereby also preventing a situation in which air cooling cannot be performed.

Further, since the intake port 41 is opened at a position which becomes the lowermost end of the labyrinth structure portion during use, it is easy to discharge accidentally intruded water drops or the like to the outside. The same applies to the exhaust port 43. That is, by providing the exhaust port 43 at the base of the baffle plate 57, it is possible to surely discharge water drops and the like that jump into the inside from the exhaust ports 43 to 45 and travel down the baffle plate 57. It is.

Since the battery package 19 is heavy, as shown in FIG. 8 (A), when the concrete vibrator 10 is placed on the ground GL, the main body falls sideways,
The intake ports 41 and 42 and the exhaust ports 43 to 45 are in a state of turning sideways. Therefore, even if it is forgotten and rain comes, it does not enter the motor housing 11. Also,
As shown in FIG. 8 (B), even when the battery package 19 is placed on the mold 95, the weight of the battery package 19 is large.
1, 42 and the exhaust ports 43 to 45 are not left in an upward state, and rainwater does not enter inside. As shown in FIG. 8C, rainwater does not enter during use. In this way, there is no danger of rainwater entering either during use or when left unattended, so that there is no need to cover the intake ports 41 and 42 and the exhaust ports 43 to 45, and the like. There is also the effect that it does not increase.

Further, in this embodiment, the exhaust ports 43 to 45 are provided.
Is facing the front of the handle housing 17, so that hot air is not applied to the operator's hand during use, and work is easy. In terms of workability, it is cordless because it is battery-powered, and you can not miss the fact that you can use it anywhere.

In addition, since the vibrating rod 15 is provided with a seal structure and is devised to improve the accuracy of the axis alignment, the inability to operate due to insufficient capacity, which is a weak point of the battery type, is avoided. However, the embodiment is advantageous. Further, in the embodiment, since the battery package 19 is completely covered with the battery cover 80, it is possible to prevent the splash of the raw concrete from entering the inside of the hook 75 and preventing the hook 75 from being pressed. Also, the battery package 19 and the handle housing 17
There will be no clogging of ready-mixed concrete in the gap.
Further, since the cover 80 is of a type in which the claws 83 are knocked out, even if the gap between the claws 83 and the handle housing 17 is clogged with ready-mixed concrete, the cover 80 cannot be opened. Also, the sealing member 8
Since 5 protrudes outward as shown in FIG. 6, when the main body is turned over, it also functions as a cushion to prevent damage.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, but can be carried out in various forms. For example, it goes without saying that the present invention can be directly applied to electric tools other than concrete vibrators.

[Brief description of the drawings]

FIG. 1 is a sectional view of a concrete vibrator according to an embodiment.

FIG. 2 is an enlarged sectional view of a main part of a vibrating rod of the concrete vibrator of the embodiment.

FIG. 3 is an enlarged sectional view of a main part of a motor housing part of the concrete vibrator of the embodiment.

FIG. 4 is an enlarged sectional view of a main part of a motor housing part of the concrete vibrator of the embodiment.

FIG. 5 is an enlarged sectional view of a main part of a motor housing portion of the concrete vibrator of the embodiment.

FIG. 6 is an enlarged sectional view of a main part of a handle housing portion of the concrete vibrator of the embodiment.

FIG. 7 is an enlarged sectional view of a main part of a handle housing portion of the concrete vibrator of the embodiment.

FIG. 8 is an explanatory diagram of a use state of the concrete vibrator of the example.

[Explanation of symbols]

10 ... Concrete vibrator, 11 ... Motor housing, 13 ... DC motor, 15 ... Vibration rod, 17 ... Handle housing, 17c ... Collar part, 19 ... Battery package, 75 ... Hooks, 77 ... Leaf springs, 80 ... Battery covers, 8
3 ... nail, 85 ... seal member.

Claims (3)

[Claims] 1. A battery for a power tool, comprising: a battery-driven power tool, wherein a battery package is inserted through an opening of a housing, and a cover is attached to the opening so as to cover the battery package. Mounting structure. 2. The battery mounting method for an electric power tool according to claim 1, wherein an opening edge of the cover and an opening edge of the housing are butted against each other, and a seal member is provided on the butted surface. Construction. 3. The battery mounting structure for an electric power tool according to claim 1, wherein the sealing member is attached to an edge of the cover so as to cover a part of an outer surface of the cover.