JP2001198856A - Power tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power tool with favorable operability by improving consideration in regard to a non-slip for a holding part of a main body. SOLUTION: A cover 5 is provided on a side face of a main body part 1 extending in a longitudinal direction of a spindle 3 from an end part of the main body part 1 opposite of the spindle, having a length of at least the fore finger in the longitudinal direction, and having a surface with a coefficient of friction larger than a surface of the main body part 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power tool having a handle connected to a main body containing a motor or the like so as to be substantially perpendicular to the axial direction of a spindle.

[0002]

2. Description of the Related Art An example of a conventional electric tool is shown in FIGS.
This will be described with reference to FIG.

[0003] A conventional power tool incorporates a motor and a deceleration mechanism (not shown), is connected to the motor via the deceleration mechanism, and rotatably holds a spindle 3 rotatable by receiving the power of the motor; It has a switch 10 for controlling the driving of the electric motor, and a handle portion 2 provided to be connected to the rear end (left side in FIG. 13) of the main body 1 so as to be substantially orthogonal to the axial direction of the spindle 3. It has a configuration with. At the tip of the spindle 3, there is provided a tool holding portion 7 having a structure in which a tip tool can be attached and detached.

[0004] The power tool shown in the figure is usually shown in Figs.
6, the power tool main body is held by gripping the handle portion 2 and the work is performed. The power point 8 when applying the thrust F to the power tool main body during the work is far away from the axis 4 of the spindle 3. Since the vertical distance X between the axis 4 and the power point 8 is large, when a thrust F is applied to the power tool main body at the time of work, a moment M applied in a direction of rotating the power tool main body with the tip tool as a fulcrum is obtained. There was a disadvantage that it became relatively large.

As a method for reducing the moment M, as shown in FIGS. 17 and 18, a thrust F is applied to the power tool main body near the axis 4 of the spindle 3 so as to apply a thrust F to the power tool main body. There is a method of holding the power tool main body by gripping the end and the side surface of the main body 1. In this case, as shown in FIG. 18, the vertical distance X between the axis 4 and the force point 8 is reduced and the moment M is reduced, so that a drilling tool can easily perform drilling perpendicular to the machined surface. Has advantages. In this type of power tool, the center of gravity is located at the spindle 3 in the main body 1.
In the method of holding the power tool main body shown in FIGS. 15 and 16, the power point 8 for applying thrust to the power tool main body is away from the center of gravity in the vertical direction. Also, the holding method shown in FIG. 18 relates to the fact that the force point 8 for applying the thrust is close to the position of the center of gravity in the vertical direction.

As described above, when the power tool main body is held as shown in FIGS. 17 and 18, the moment M applied to the power tool main body when the thrust F is applied to the power tool main body can be reduced. However, in terms of holding the power tool main body, in order to position the first finger and the second finger on the side of the main body 1 as compared with the holding method of holding the handle 2 as shown in FIGS. It was difficult to hold.

In order to facilitate holding of the power tool main body, recesses 9 for guiding the first finger and the second finger are provided on both side surfaces of the main body 1 and the end of the main body 1 on the side opposite to the spindle. However, since the surface of the depression 9 is often hard and has a relatively small friction coefficient, the first finger and the second finger are easily slipped, and the side surface of the main body 1 is held between the first finger and the second finger. When the power tool main body is held, the force applied to the first finger and the second finger must be increased.

[0008]

In recent years, a cover 5 whose surface is larger than the friction coefficient of the main body 1 and the handle 2 has been proposed in order to prevent slippage when holding the power tool main body.
As shown in FIGS. 9, 20, 21, and 22, there is a configuration provided so as to cover a part of the side surface of the handle portion 2 opposite the spindle and the vicinity of the end surface of the body portion 1 opposite the spindle side.
As shown in FIGS. 16 and 17, when the power tool main body is held, the cover 5 is not provided at the side of the main body 1 where the first finger and the second finger are located. As shown in FIGS. 16 and 17, when the power tool main body is held, the first finger and the second finger are slippery, and the force applied to the first finger and the second finger must be increased. .

It is an object of the present invention to provide a power tool with good operability, with sufficient consideration given to non-slip even in the above-described holding method.

[0010]

SUMMARY OF THE INVENTION The object of the present invention is to provide a spindle device having a side surface extending from the end of the main body opposite the spindle to the longitudinal direction of the main body, having a length of at least a second finger in the longitudinal direction, and having a surface. This is achieved by providing a cover having a larger coefficient of friction than the surface of the main body.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a power tool according to the present invention will be described with reference to FIGS. 1 is a side view showing an embodiment of the power tool according to the present invention, FIG. 2 is another side view showing an embodiment of the power tool according to the present invention, and FIG. Fig. 4 is a side view showing an embodiment of a cover constituting the power tool according to the present invention. Fig. 5 is a cross-sectional view taken along line CC of Fig. 4, and Fig. 6 is a power tool showing a state where the cover is removed. FIG. 7 is a side view showing one embodiment, and FIG.
FIG. 8 is a cross-sectional view taken along line BB of FIG. 1, FIG. 9 is a cross-sectional view taken along line AA of FIG. 1, FIG. 10 is a developed view of FIG. 9, and FIG. FIG. 12 is a side view showing one working state of the power tool, and FIG. 12 is another side view showing one working state of the power tool according to the present invention.

The electric power tool shown in FIG. 1 has a built-in electric motor and a speed reduction mechanism. The main body 1 rotatably holds a spindle 3 connected to the electric motor via the speed reduction mechanism. A handle portion 2 provided with a switch 10 for controlling an electric motor, which is provided so as to be substantially orthogonal to the main body portion 1, a tool holding portion 7 provided at a tip of the spindle 3 and capable of attaching and detaching a tip tool; Handle part 1
, A cover 5 having a shape covering the vicinity of the end surface on the side opposite to the spindle of the main body 1 and both side surfaces of the main body 1.

As shown in FIGS. 1 and 2, the cover 5 is located on both sides of the main body 1 and extends near the axis 4 of the spindle 3 in the longitudinal direction of the spindle 3 by a length L. As shown in the figure, the handle portion 2 has a shape including a side opposite to the spindle side and a portion covering the vicinity of the end of the main body portion 1 opposite to the spindle side, and the dimension L is at least larger than the length of the second finger. (In the present embodiment, the dimension L is set to about 110 mm.) Note that the width W of the cover 5 is set to be equal to or larger than the width of the second finger (in the present embodiment, the dimension W is set to about 25 mm).

The cover 5 has a base portion 5a made of a relatively hard material positioned inside as shown in FIG.
A surface portion 5b, which is located on the outside and whose surface has a higher coefficient of friction than the main body portion 1 and the handle portion 2 and is made of a material such as rubber, and a portion of the surface portion 5b located on the handle portion 1 and the main body portion A protrusion 5c and a plurality of protrusions 5i are provided at a position located on one side surface. The cover 5 is shown in FIG.
As shown in FIG. 5, the recess 9 is formed at a position located at the end of the main body 1 on the side opposite to the spindle and at a position located at the side surface of the main body 1.

FIGS. 6 and 7 show the state of the power tool with the cover 5 removed. As shown in FIGS. 6 and 7, the side of the handle portion 2 to which the cover 5 is attached is opposite to the end of the main body 1 opposite the spindle side and the main body. The two side surfaces of the cover 1 are formed to have substantially the same shape as the cover 5 and to be lower than the peripheral portion by a dimension substantially equal to the thickness dimension T of the cover 5. I try to be flush.

Next, the mounting structure of the cover 5 will be described.

As shown in FIG. 9 and FIG.
And the part which forms the non-spindle side end part of the main-body part 1 is divided | segmented into the 1st outer frame 2a and the 2nd outer frame 2b, It is comprised by the 1st outer frame 2a and the 2nd outer frame 2b, respectively. The seat surface 2d having the screw through hole 2c is provided.

On the other hand, the base 5a of the cover 5 has mounting seats 5g corresponding to the seating surfaces 2d of the first outer frame 2a and the second outer frame 2b, respectively, and screws provided on the first outer frame 2a. A female screw hole 5f that can communicate with the through hole 2c, and a through hole 5 that can communicate with the screw through hole 2c provided in the second outer frame 2b.
e and a screw mounting seat 5d.

After engaging the outer frames 2a, 2b and the cover 5, the screw 6 is positioned on the screw mounting seat 5d, and the through hole 5
If the screw 6 is engaged with the female screw 5f via the screw e and the screw through hole 2c and tightened, the assembly of the outer frames 2a and 2b and the attachment of the cover 5 to the outer frames 2a and 2b can be performed. In addition, the said structure is provided in two places near the upper part and lower part of outer frame 2a, 2b, and assembles outer frame 2a, 2b and attaches cover 5 more reliably.

As shown in FIG. 4, a protrusion 5h is provided at the tip of the cover 5, and as shown in FIGS. 7 and 8, the side surface of the main body 1 corresponds to the protrusion 5h. A concave portion 1e is provided, and by engaging the convex portion 5h with the concave portion 1e, the portion of the cover 5 located on the side surface of the main body 1 can be attached without providing a screw or the like.

The power tool has a cover 5 having the above configuration.
As shown in FIGS. 11 and 12, the handle 2 and the end of the main body 1 on the opposite side of the spindle and the side of the main body 1 are gripped, and the axis 4
When the power tool main body is held so that a thrust can be applied to the power tool main body at the opposite end of the main body portion 2 on the side opposite to the spindle, the first finger is placed on the cover 5 located on both side surfaces of the main body portion 1. And the second finger are located, and the first finger and the second finger are less likely to slip. Thereby, when holding the power tool main body by holding the side surface of the main body 1 between the first finger and the second finger, the force applied to the first finger and the second finger can be suppressed, and the workability can be improved. You can plan. In particular, since the length L of the cover 3 in the longitudinal direction of the spindle 3 is larger than at least the length of the second finger, the cover 5 is located at the fingertips of the first finger and the second finger. It becomes easy to hold the side of the main body 1.

The length L extending in the longitudinal direction of the spindle 3 from the end of the main body 1 on the side opposite to the spindle is at least longer than the length of the second finger, but is issued by the Human Life Engineering Research Center shown in FIG. According to page 192 of "Human Body Dimension Data Collection for Design" (published by Nippon Shuppan Service Co., Ltd.), the length of the second finger in young boys occupies 97.5% or less of 78 mm or less. With
In this embodiment, the dimension L of the cover 5 in the longitudinal direction of the spindle 3 is set to about 110 mm which satisfies 78 mm or more. Further, it is desirable that the width dimension W of the cover 5 be equal to or larger than the width of the second finger. The average value of the maximum width is 16.4 mm, and in the present embodiment, the width dimension W is set to about 25 mm, which is larger than the average value. Note that the width W of the cover 5 does not necessarily need to be equal to or greater than the width of the second finger, and may be equal to or less than the width of the second finger as long as the sliding of the first finger and the second finger can be suppressed. .

In the above embodiment, the cover 5 is formed so as to cover the side of the handle portion 2 opposite the spindle, the vicinity of the end of the main body 1 opposite the spindle, and a part of both side surfaces of the main body 1. 5 can improve the assemblability, but a cover located only on the side surface of the main body 1 may be used, and a part covering the handle part 2 and a part covering the main body 1 are divided. It is good also as having made it.

As in the above embodiment, the cover 5 is formed symmetrically and the cover 5 is located on both side surfaces of the main body 1, so that the hand holding the side of the main body 1 can be held by either hand. Even if there is, the cover 5 can suppress the sliding of the first finger and the second finger located on the side surface of the main body 1.

Further, since the plurality of projections 5i are provided on the portion of the cover 5 located on the side surface of the main body 1 as in the above embodiment, the sliding of the first finger and the second finger can be further suppressed. Can be. Further, the same effect can be obtained even if a plurality of concave portions are used instead of the convex portions 5i.

In the above-described embodiment, the shape of the cover 5 descends toward the spindle 3 as is apparent from the figure. This is because the second finger tends to tilt toward the inside of the hand when gripping.

In the above-described embodiment, the power tool is a substantially L-shaped power tool in which the handle portion 1 extends downward substantially perpendicular to the longitudinal direction of the main body 1 from the end of the main body 1 on the side opposite to the spindle. As shown in FIGS. 11 and 12, as a holding method for applying a thrust to the power tool main body in the vicinity of the axis 4 of the spindle 3 in order to reduce the moment applied in the direction in which the power tool main body is rotated, as shown in FIGS. The method of gripping the end of the unit 1 on the side opposite to the spindle and the side surface of the main unit 1 has been described, but the method is not limited to this.

[0028]

According to the present invention, on the side of the main body, the main body extends in the longitudinal direction of the spindle from the end opposite to the spindle, and has at least the length of the second finger in the longitudinal direction, and the surface has the surface of the main body. By providing a cover having a larger coefficient of friction than the surface of the main body, the first finger positioned on the side of the main body when the main body is held so that no moment is applied in the direction of rotating the main body when thrust is applied to the main body In addition, the slip of the second finger can be suppressed, and a power tool with good operability can be provided.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a power tool according to the present invention.

FIG. 2 is another side view showing an embodiment of the power tool according to the present invention.

FIG. 3 is a view in the direction of arrow D in FIG. 2;

FIG. 4 is a side view showing an embodiment of a cover constituting the power tool according to the present invention.

FIG. 5 is a sectional view taken along line CC of FIG. 4;

FIG. 6 is a side view showing an embodiment of the power tool with a cover removed.

FIG. 7 is a view as seen in the direction of arrow E in FIG. 6;

FIG. 8 is an enlarged view of a main part in section taken along line BB of FIG. 1;

FIG. 9 is a sectional view taken along line AA of FIG. 1;

FIG. 10 is a development view of FIG. 9;

FIG. 11 is a side view showing one working state of the power tool according to the present invention.

FIG. 12 is another side view showing one working state of the power tool according to the present invention.

FIG. 13 is a side view showing an example of a conventional power tool.

FIG. 14 is a view as seen in the direction of arrow F in FIG. 13;

FIG. 15 is a side view showing one working state of the power tool shown in FIG. 13;

FIG. 16 is another side view showing one working state of the power tool shown in FIG. 13;

FIG. 17 is a side view showing another working state of the power tool shown in FIG. 13;

18 is another side view showing another working state of the power tool shown in FIG.

FIG. 19 is a side view showing an example of a conventional power tool.

FIG. 20 is a view as seen in the direction of arrow G in FIG. 19;

FIG. 21 is a side view showing an example of a conventional power tool.

22 is a view as viewed in the direction of arrow H in FIG. 21.

FIG. 23 is a result table showing measurement data on the length of the second finger.

[Explanation of symbols]

1 is a main body, 2 is a handle, 3 is a spindle, 4 is an axis, 5 is a cover, 5i is a protrusion, 6 is a screw, 7 is a tool holding part, 8 is a power point, and 9 is a depression.

Claims (6)

[Claims] An electric motor, a main body containing the electric motor,
A spindle rotatably held by the main body, connected to the electric motor via a speed reduction mechanism, and a switch for controlling the driving of the electric motor, the main body being substantially orthogonal to the axis of the spindle; A power tool having a handle portion connected to the main body portion, the power tool extending in a longitudinal direction of the spindle from a non-spindle side end of the main body portion, and having a length of at least a second finger in the longitudinal direction. A power tool comprising a cover having a surface having a larger coefficient of friction than the surface of the main body. 2. The power tool according to claim 1, wherein the cover has a shape that covers at least a part of the handle portion opposite the side surface of the spindle. 3. The power tool according to claim 1, wherein the cover is formed symmetrically. 4. The power tool according to claim 1, wherein a width of the cover is equal to or larger than a width of the second finger. 5. The power tool according to claim 1, wherein the cover has at least one protrusion or recess. 6. The power tool according to claim 1, wherein the cover has a divided configuration.