JP3032529B2 - Battery mounting structure for power tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a battery mounting structure for a battery-powered power tool.

[0002]

2. Description of the Related Art A power tool is often used in a place where a large amount of dust is generated as in a construction site. In recent years, as the capacity of rechargeable batteries has been improved, a large number of battery-powered power tools have come to be seen.

[0003] Such batteries are usually packaged and can be removed from the tool for charging. For example, as disclosed in Japanese Utility Model Application Laid-Open No. 5-48214 and Japanese Utility Model Application Laid-Open No. 3-21906, a method of fixing a battery package by hooking a hook of a battery package to a lower opening edge of a handle housing is often used.

[0004]

However, as described above, since such a power tool is used in a dusty environment, dust penetrates through a gap between the handle housing and the battery package and penetrates into the hook. In some cases, the hook cannot be compressed. For this reason, there was a possibility that the battery package could not be removed.
Further, in the case of work outdoors, there is a risk that rainwater may enter through a gap between the battery and the housing, and this has a problem that electric components housed inside the power tool are adversely affected.

In view of the above, the present invention provides a battery-operated power tool that allows the battery package to be easily attached to and detached from the tool even in outdoor work or in a poor working environment with a lot of dust, and to allow the rainwater or dust from the outside to enter the tool. It is an object of the present invention to provide a battery mounting structure that can easily prevent intrusion of a battery.

[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 a power tool according to the present invention is a battery-powered power tool that includes a plurality of battery cells. The battery package housed inside was partially inserted through the opening of the housing and exposed from the opening of the battery package.
The hook extending from the part is
The battery package by pulling it out
It is fixed to the housing so that it can be
Complete the exposed part of the specified battery package
A cover is attached to the opening so as to cover the opening. This arrangement, this overhang of the housing
It is provided to protrude inside the lower end and is
Hook extended from the inside to this overhang
Configuration, that is, push in this hook from the outside
As a result, the battery package is
It can be applied to the configuration that is performed.

According to this battery mounting structure, since the cover is attached to the opening of the housing, external dust and the like do not enter the housing. Therefore, it is not possible to remove the battery package due to dust clogging. Here, the cover is mounted so as to be pivotally supported with respect to the housing, and is configured to be externally hooked to a flange protruding out of the housing at a side opposite to the pivot. Good to be. With this arrangement, even when the cover is opened, there is no need to push the member inward, and even if dust or the like is clogged in the latching portion, the member will not be opened.

The seal member may be attached to an edge of the cover so as to cover a part of the outer surface of the cover. In this way, even when the power tool is turned over, it becomes a cushion, and the electric components inside the power tool can be protected from vibration.

[0009]

Next, an embodiment of the present 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 passes through the flexible shaft 23 in the flexible hose 21, and an unbalancer 25 having a deviated center of gravity is attached to the tip of the flexible shaft 23 via a joint 23 a connected to the flexible shaft 23. It is covered with a tip cap 27. 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 this embodiment is a battery type and is not suitable for a large load, deterioration of the durability of the ball bearing 35 is prevented by such foreign matter being caught.

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 is provided.
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 matters and water droplets fall from the inside of the handle housing 17 into the exhaust port 43 at the base of the handle housing lower support 17a without jumping into the inside.

Further, among the ring-shaped plates 51 and 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.

The coupling fitting 60 is connected to 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 need to be connected so that their axes are 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
Motor 5 can be obtained by accurately processing the joint between
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, an 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. Also, four notches 61 are formed in the first coupling fitting 61 so as to be located at 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 rotates,
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 in the upper and lower portions of 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. For this reason, as shown by the arrow in the drawing, the exhaust swirls in the loop-shaped passage 53 only in one direction, and flows out smoothly to 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 structure for attaching and detaching 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. Also, as shown in FIG. 6, a hook 75 is attached to the protrusion 17b extending inward at the lower end of the handle housing 17. The hook 75 is provided with a leaf spring 77 inside. When the finger is pressed from the outside, it contracts and fends off the overhang 17b.

In this embodiment, the 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 mounted on 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.

[0022]

According to the present embodiment described in detail above, the following effects are exhibited because the above-described structure is employed. 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.

In addition, since the intake port 41 is opened at a position at the lowermost end of the labyrinth structure during use, it is easy to discharge water droplets and the like that have entered by mistake to the outside. The same can be said for 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, when the concrete vibrator 10 is placed on the ground GL, as shown in FIG.
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
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 ease of work, battery-operated makes it cordless and can be used anywhere.

In addition, since the vibrating rod 15 is provided with a seal structure and devised to improve the accuracy of axis alignment, it is possible to avoid a state of inoperability due to insufficient capacity, which is a weak point due to a battery type. However, the embodiments are 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.

The embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and can be embodied in various forms. For example, it goes without saying that the present invention can be applied to electric tools other than concrete vibrators as they are.

[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]

DESCRIPTION OF SYMBOLS 10 ... Concrete vibrator, 11 ... Motor housing, 13 ... DC motor, 15 ... Vibrating rod, 17 ... Handle housing, 17c ... Flange part, 19 ... Battery package, 75 ... hook, 77 ... leaf spring, 80 ... battery cover, 8
3 ... claw, 85 ... seal member.

Claims (3)

(57) [Claims] 1. A power tool battery-powered, double
A battery package containing a number of battery cells therein is partially inserted through an opening of the housing and extends from a portion of the battery package exposed from the opening.
The battery package is detachably fixed to the housing by hooking the hook on an overhang provided on the housing, and further fixed to the housing.
Fully exposed portions of the constant has been the battery package
Battery mounting structure of an electric tool cover is attached to the opening so as obscure to. 2. The housing according to claim 2, wherein the overhang is a lower end of the housing.
Of the battery package.
Hook extended from the inside
The battery package pushes the hook from outside.
It is noted that the housing
The battery mounting structure for a power tool according to claim 1. 3. A claw having a hook at a tip protrudes from an outer surface of the cover, and the hook is hooked from outside to a flange protruding outside from the housing. the battery mounting structure of an electric tool according to claim 1 or claim 2, wherein the cover is configured to be secured to the housing.