JP3015311B2 - Power tool handle positioning mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a handle positioning mechanism for a power tool, and more particularly to a handle positioning mechanism for a power tool whose handle is rotatable with respect to a main body of the power tool.

[0002]

2. Description of the Related Art FIG.
There are grinders as shown in A and B. A polishing disk 65 is provided at the tip of the main body 62, and the polishing disk 65 rotates by being driven by a motor. A handle 64 is connected to the rear of the main body 62. As shown in FIG. 8B, the handle portion 64 includes half portions 64A and 64 #. The main body 62 has an annular groove 67 at the connection portion, and the handle 64 has an annular protrusion 68 at the connection portion. The main body 62 and the handle 64 are connected by the engagement of the annular projection 68 with the annular groove 67.

As shown in FIGS. 8A and 8B, a tightening screw 77 penetrates in the vicinity of the annular projection 68 of the handle 64, and a tightening nut 78 is screwed into the tightening screw 77 so as to be cut in half. Portions 64 #, 64 # are connected. When the tightening screw 77 is tightened with a screwdriver, the half portions 64 # and 64 # are tightened, and the annular protrusion 68 is pressed inward to increase the engagement with the annular groove 67. Thus, the positional relationship between the main body 62 and the handle 64 can be maintained.

Conversely, if the tightening screw 77 is loosened with a screwdriver, the handle 64Α and the handle 64Β are loosened,
The engagement between the annular protrusion 68 and the annular groove 67 is loosened, and the main body 62 and the handle 64 can rotate. In this state, the main body 62 is rotated, and the direction of the polishing disk 65 is adjusted according to the work situation.

[0005] The handle portion 64 is rotated and the polishing disc 65 is rotated.
In order to adjust the orientation of the camera, it is possible to perform positioning at four places at intervals of 90 degrees. 9A and 9B are cross-sectional views taken along arrows IX-IX shown in FIG. Note that FIG. 9B
A cross section of a connection portion between the handle portions 64 # is shown.

As shown in FIGS. 9A and 9B, a protrusion 62T is formed in the main body 62, and a recess 64K is formed in the handle 64 (handles 64 #, 64 #). The recesses 64K are formed at four places at intervals of 90 degrees. When the handle portion 64 is rotated with respect to the main body portion 62, the protrusion 62T fits into the recess 64K, and positioning can be performed by a click feeling due to the fitting.

After the handle 64 is rotated to adjust the direction of the polishing disk 65, the tightening screws 7 are re-tightened.
7 is inserted into the screw hole and tightened with a screwdriver to fix the adjusted positional relationship between the main body 62 and the handle 64.

[0008]

The above-described conventional power tool has the following problems. First, the handle portion 64 is rotated with respect to the main body portion 62, and when the protrusion 62T shown in FIG. . Due to this contact pressure, there is a problem that the handle portion 64 cannot be smoothly rotated with respect to the main body portion 62.

When the bulge of the protrusion 62T is reduced, the contact pressure due to the protrusion 62T can be reduced.
There is a problem that the click feeling due to the fitting between the protrusion 62T and the recess 64K is reduced and the positioning cannot be performed reliably.

A motor for driving the polishing disk 65 is housed in the main body 62, and a handle 6 is provided.
4 is electrically connected to the switch unit provided in the switch unit 4. When the handle portion 64 is rotated with respect to the main body portion 62, the connection wire may be slackened or the connection wire may be pulled by the influence of the rotation. If the connection wire is slack, the connection wire may be entangled with the motor, and if the connection wire is pulled, the connection wire may be broken.

Therefore, according to the present invention, when the handle portion is rotated and positioned with respect to the main body portion, a reliable click feeling can be obtained, and the handle portion can be smoothly rotated. An object of the present invention is to provide a power tool positioning mechanism that can prevent disconnection and the like.

[0012]

According to a first aspect of the present invention, there is provided an electric power tool with a handle positioning mechanism, comprising: a main body; and a handle connected to the main body and rotatable with respect to the main body. A first fitting portion provided on one of the main body and the handle portion, and a second fitting portion provided on the other of the main body and the handle portion and capable of fitting to the first fitting portion. And a second fitting portion provided corresponding to the rotation orbit of the first fitting portion.
At least one of the fitting portion and the second fitting portion has elasticity, and the first fitting portion and the second fitting portion are fitted based on the elasticity, and positioning of the handle portion with respect to the main body portion is performed. Done
The connection between the main unit and the handle is
When the handle is rotated, the first fitting portion and the second fitting portion
Connection space to prevent contact load
Is, the second fitting portion is constituted by two projections, fitting first
The mating portion can be fitted into the concave portion between the two protrusions of the second fitting portion.
It is characterized by being configured as a projection .

[0013]

[0014]

According to a second aspect of the present invention, there is provided a power tool handle positioning mechanism according to the first aspect, wherein the main body is provided with a motor, and the handle is provided with the motor. A switch unit for controlling driving is provided, and a connection line that electrically connects the motor and the switch unit is a rotation center point of the handle unit with respect to the main body unit,
Or, it is arranged so as to pass near the rotation center point, and is a connection line holding portion located between the motor and the handle portion on the main body portion, and is constituted by a plurality of ribs.
That includes a connection line holding portion, constituting the connecting wire holding portion
A plurality of ribs, in the upward direction from the rotation center point, is arranged with a shift in staggered from one another, and in a downward direction from the rotation center point, is arranged with a shift in staggered from each other, connecting wire holding portion Wherein the connection line is held by a rib constituting the handle.

[0016]

[0017]

According to the first aspect of the present invention, a first fitting portion is provided on one of the main body and the handle portion, and a second fitting portion is provided on the other of the main body and the handle portion. Part is provided. At least one of the first fitting portion and the second fitting portion has elasticity, and the first fitting portion and the second fitting portion are fitted based on the elasticity, and the handle for the main body portion is provided. The positioning of the part is performed.

Since at least one of the first fitting portion and the second fitting portion has elasticity, when the handle is rotated with respect to the main body, the first fitting portion or the second fitting portion is rotated. The contact load due to the joint can be reduced, and the handle can be smoothly rotated. Also, the first fitting portion and the second
When the fitting portion is fitted, a click feeling due to elasticity can be obtained, and the positioning of the handle portion with respect to the main body portion can be clearly confirmed.

[0019]

Further, the connecting portion between the body portion and the handle portion, when rotating the handle relative to the body portion, the connection portion for not adding the contact load with the first mating portion and the second fitting portion A space is formed.

As described above, since the connecting portion space is formed at the connecting portion between the main body portion and the handle portion, when the handle portion is rotated with respect to the main body portion, the first fitting portion or the second fitting portion is formed. The contact load due to the joint can be reduced, and the handle can be smoothly rotated. Further, the second fitting portion
The first fitting part is constituted by two projections, and the second fitting part
A projection that can be fitted into the recess between the two projections
Have been. For this reason, the handle is rotated with respect to the main body.
The first fitting portion contacts one of the protrusions of the second fitting portion.
Load occurs on the handle that had been rotating smoothly until then.
To recognize that the handle has approached the mating position.
Can be.

According to a second aspect of the present invention, a motor is provided in the main body, and a switch for controlling the driving of the motor is provided in the handle. The connection line that electrically connects the motor and the switch unit is disposed so as to pass through the rotation center point of the handle with respect to the main body or in the vicinity of the rotation center point.

Therefore, even when the handle is rotated with respect to the main body, the length of the connection line between the motor and the switch is substantially constant, and the connection line is slack or connected with the rotation of the handle. Wire pulling can be avoided. By avoiding the slack of the connection line, the connection line can be prevented from being entangled with the motor. Further, by avoiding the pulling of the connection line, disconnection of the connection line can be prevented.

The main body includes a motor and a handle.
A connection wire holding part located between
Is provided. this
The plurality of ribs that make up the connection line holding part are
In the upward direction,
, And steps downward from the center of rotation
It is arranged in a state shifted to. And the connection line holding part
The connection line is held by the ribs that constitute .

The length of the connection line between the motor and the connection line holding portion can be kept constant by holding the connection line on the rib constituting the connection line holding portion. As a result, it is possible to reliably prevent the connection wire from being slackened or the connection wire from being pulled. By avoiding the slack of the connection line, the connection line can be prevented from being entangled with the motor. Further, by avoiding the pulling of the connection line, disconnection of the connection line can be prevented. Further, the ribs constituting the connection line holding portion are arranged so as to be offset from each other in the upward direction from the rotation center point, and are arranged so as to be offset from each other in the downward direction from the rotation center point. . Therefore, it is possible to select the rib constituting the connection line holding portion according to the type of the motor and hold the connection line at an appropriate position. In other words, the position and number of connecting wires may differ depending on the type of motor,
It can be selected ribs constituting the.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a handle part positioning mechanism for a power tool according to the present invention will be described using a grinder as an example. 1 and 2 are side views of the entire grinder in the present embodiment. FIG. 3 is a side cross-sectional view near the connection between the main body 2 and the handle 5, and FIG. 4 is a sectional view taken along the line IV-IV shown in FIG.
FIG. 5 is a sectional view taken in the direction of arrows VV shown in FIG. 3. 6A is a cross-sectional view taken along the line VIA-VIA shown in FIG. 4, and FIGS.
It is a figure which shows the detail of 1 and 22 vicinity. FIG. 7 is a side cross-sectional view near the connection between the main body 2 and the handle 5, and is a diagram showing the arrangement of connection lines.

[Outline of Overall Configuration] A motor 3 is mounted on the main body 2.
5 is built in (see FIG. 7), and a rotating grindstone 4 is provided at the tip of the main body 2. And this rotating whetstone 4
Rotates when driven by the motor 35. A handle 5 is connected to the main body 2. FIG. 3 is a side cross-sectional view of the vicinity of the connection between the main body 2 and the handle 5. As shown in FIG. 3, the main body 2 and the handle 5 are connected by the engagement of the annular unevenness 8 provided on the main body 2 and the annular unevenness 9 provided on the handle 5. ing.

The handle 5 is rotatable with respect to the main body 2, and when the state shown in FIG. 1 is used as a reference position, the handle 5 can be rotated 90 degrees in the left-right direction and positioned.
FIG. 2 shows a state in which the handle 5 is rotated clockwise. FIG. 1 shows a case in which an object is polished using a rotary grindstone 4, and FIG. 2 shows a case in which an object is cut using a rotary grindstone 4 in a vertical direction.

It should be noted that the handle portion 5 is divided into two parts in the axial direction.
The main body 2 is connected with the half halves by sandwiching the annular uneven portion 8. The two halves are fixed by bolts 17.

The handle portion 5 has four positioning bolts 1
8 are provided. The positioning bolt 18 is attached to the main body 2.
(See FIG. 6A).
Four nuts 19 are provided on the main body 2 at intervals of 90 degrees. When switching the position with respect to the main body 2 by rotating the handle 5, the four positioning bolts 18 are loosened and removed from the nut 19, and the handle 5 is rotated. And
After the positioning, the positioning bolt 18 is tightened to fix the position.

The handle portion 5 has a built-in switch portion 36 (see FIG. 7), and a switch trigger 7 is provided. When the switch trigger 7 is squeezed, the switch unit 36 is turned on, and the motor is driven to rotate the rotary grindstone 4. When the switch trigger 7 is released, the switch unit 36 is turned off, and the rotary grindstone 4 stops rotating.

[Positioning Mechanism of Handle 5] As described above, when the handle 5 is rotated to switch the position with respect to the main body 2, the four positioning bolts 18 are loosened to make the handle 5 rotatable. . Then, the handle 5 is rotated with respect to the main body 2.

As described above, the four positioning bolts 18
Are screwed into nuts 19 fixed at 90 ° intervals at four locations of the main body 2 to fix the position of the handle 5, so that the handle 5 needs to be rotated exactly 90 °. For this reason, a click feeling at this 90-degree position is provided so that the operator can recognize that the handle portion 5 has been rotated by 90 degrees.
That is, a response is caused.

The structure for generating the click feeling will be described in detail. As shown in FIG. 4, a protrusion 20 as a first fitting portion is provided near the annular uneven portion 9 of the handle 5. On the other hand, the main body 2 is provided with receiving projections 21 and 22 which are second fitting portions corresponding to the rotation orbit of the projection 20. The receiving projections 21 and 22 are provided at four locations at 90-degree intervals.

In this embodiment, the positioning is performed by rotating the reference position shown in FIG. 1 by 90 degrees in the left-right direction, and the handle 5 only needs to be able to be switched to three positions. Therefore, of the receiving projections 21 and 22 provided at four locations, three receiving projections 21 and 22 are used in the present embodiment.

An elastic space 23 is formed on the back side of the receiving projections 21 and 22, and the receiving projections 21 and 22 are positioned on the thin plate portion 24 by the elastic space 23. Since at least the thin plate portion 24 is made of a resin material, the receiving protrusions 21 and 22 are bent inward to generate elasticity.

As shown in FIG. 6B, the receiving projections 21 and 22
When the projection 20 is fitted in the recess between the
Is positioned with respect to the main body 2, and in this state,
The positioning bolts 18 can be screwed into the nuts 19 (FIG. 6A).

Loosen the positioning bolt 18 and remove it.
The projection 20, the receiving projection 21 when rotating the handle 5,
FIG. 6C shows the state 22. The receiving projection 21 is pressed by the projection 20, the thin plate portion 24 bends inward,
The projection 20 gets over the receiving projection 21. Thus, the projection 20 is disengaged from the receiving projections 21 and 22, and is in a rotatable state.

As shown in FIG. 4, the main body 2 and the handle 5
A connection space 25 is formed between the two. By forming the connection space 25, the handle 5
When the is rotated, no contact load is applied to the projection 20 and the receiving projections 21 and 22. For this reason, the handle part 5 can be rotated smoothly.

At the point when the handle 5 has been rotated approximately 90 degrees,
The protrusion 20 contacts the adjacent receiving protrusion 22 (the upper receiving protrusion 22 in FIG. 4). When the projection 20 abuts on the adjacent receiving projection 22, a load is applied to the handle portion 5 that has been rotating smoothly, and the operator recognizes that the handle portion 5 has approached the 90-degree rotated position. .

By rotating the handle 5 continuously against the load of the projection 20 and the receiving projection 22, the thin plate portion 24 is bent inward, and the receiving projection 22 is
It is pushed down according to the rotational movement of. As a result, the projection 20 fits into the recess between the receiving projections 21 and 22.
The operator determines that the 90-degree rotation has been positioned by the click feeling at the time of fitting, stops the rotation operation of the handle part 5, and tightens the four positioning bolts 18 to fix the position.

[Arrangement of Connection Lines 41 and 42] Next, a connection line 4 for electrically connecting the motor 35 and the switch section 36 is provided.
The wirings 1 and 42 will be described. As shown in FIG.
Ribs 31 and 32 as connection line holding portions are provided in the main body 2.
33 and 34 are provided. In FIG.
1 and 32 are located upward, and the ribs 33 and 34 are located downward. The ribs 31 and 32 and the ribs 33 and 34 are provided so as to be shifted from each other.

As shown in FIG. 7, two connection wires 41 and 42 of the motor 35 housed in the main body 2 are wound around ribs 31 and 33, respectively. In the assembling process of the grinder, the connection line 4 is kept in a state where the main body 2 and the divided half of the handle 5 are separated.
1 and 42 are wound around the ribs 31 and 33, and the connection wires 41 and 4
2 is held by ribs 31 and 33. Also, connection lines 41, 4
2 may be held by hooking on the ribs 31 and 33. At this time, between the motor 35 and the ribs 31 and 33, the connection wires 41 and 42 are wound so as not to cause slack.

Connection wire 4 wound around ribs 31 and 33
1, 42 are bundled together and connected to the switch unit 36 in the handle unit 5. Thereafter, the main body 2 is sandwiched between the divided half portions of the handle portion 5, the two half portions are fixed with the bolts 17, and the handle portion 5 is connected to the main body portion 2.

In general, for the convenience of the assembling process, there is a margin in the length of the connection wires 41 and 42, and the main body 2
When the handle and the handle 5 are connected, the connection wires 41 and 42 are slackened. In the present embodiment, the connection wires 41 and 42 are wound around the ribs 31 and 33 as described above. For this reason, at the interval L1 shown in FIG.
1 and 42 do not sag, and the sagging of the connecting wires 41 and 42 occurs in the handle portion 5.

Since the connection lines 41 and 42 do not slack at the interval L 1, the connection lines 41 and 42 do not become entangled with the motor 35. Further, since the lengths of the connection lines 41 and 42 at the interval L1 can be kept constant, the connection lines 41 and 42 are not pulled by the rotation of the handle portion 5 and disconnection of the connection lines 41 and 42 is prevented. can do.

In the present embodiment, as described above, the rib 31,
32 is located upward, and the ribs 33 and 34 are located downward (see FIG. 4). The rib 31 and the rib 3
2. The rib 33 and the rib 34 are provided so as to be shifted from each other.

Therefore, the rib can be selected according to the type of the motor, and the connection wire can be wound at an appropriate position. That is, the position and number of connection lines of the motor may differ depending on the type, and the rib can be selected according to the situation. For example, when the motor has three connection lines, the third connection line may be wound around one of the ribs 32 and 34 shown in FIG.

As shown in FIG. 7, the connection wires 41 and 42 bundled together are connected to the center hole 5 of the handle 5 of the handle 5.
H. This handle center hole 5H
Are formed near the center of rotation of the handle 5. In the present embodiment, the connection lines 41 and 42 are provided at the handle portion center hole 5H.
Therefore, even if the handle 5 is rotated with respect to the main body 2, the connection line 41 between the motor 35 and the switch 36
The length of 42 is almost constant.

Therefore, it is possible to avoid the connection wires 41 and 42 from being slackened or the connection wires 41 and 42 from being pulled due to the rotation of the handle 5. By avoiding the slack of the connection lines 41 and 42, the connection lines 41 and 42
5 can be prevented. Also, connection lines 41 and 42
By avoiding the pulling of the connecting wires, disconnection of the connecting wires 41 and 42 can be prevented. Further, in the present embodiment, since the two connection wires 41 and 42 are bundled into one and passed through the handle center hole 5H, assembly and disassembly operations are facilitated.

[Other Embodiments] In the above embodiment, a grinder has been described as an example. However, the present invention is not limited to this, and any power tool whose handle can rotate with respect to the main body can be used. It can be applied to other tools. In addition, the projection 20 is illustrated as the first fitting portion, and the receiving projections 21 and 22 are illustrated as the second fitting portion. Other shapes and structures can be adopted as the first fitting portion and the second fitting portion.

Further, in the above-described embodiment, the receiving projections 21 and 22 are provided with elasticity by the thin plate portion 24, but the present invention is not limited to this. Projections 21, 22
May be given elasticity. Also, elasticity is given to the projection 20 instead of the receiving projections 21 and 22, or
Elasticity can be imparted to both the projection 22 and the projection 20.

In the above-described embodiment, the ribs 31, 32, 33, and 34 have been exemplified as the connection line holding parts. However, the present invention is not limited to this, and the ribs may be located between the motor and the handle part. Other shapes, structures and other arrangements may be employed as long as they are used. Furthermore, four ribs are illustrated,
One or less or five or more ribs may be provided.

[Brief description of the drawings]

FIG. 1 is an overall side view of a grinder showing an embodiment of a handle part positioning mechanism of a power tool according to the present invention.

FIG. 2 is an overall side view of a grinder illustrating an embodiment of a handle portion positioning mechanism of the power tool according to the present invention.

FIG. 3 is a side cross-sectional view of the vicinity of a connection between the main body 2 and the handle 5 shown in FIGS. 1 and 2;

FIG. 4 is a sectional view taken along arrow IV-IV shown in FIG. 3;

FIG. 5 is a sectional view taken in the direction of arrows VV shown in FIG. 3;

6A is a sectional view taken in the direction of arrows VIA-VIA shown in FIG. 4, and FIGS.

FIG. 7 is a side cross-sectional view near a connection portion between the main body portion 2 and the handle portion 5 shown in FIGS. 1 and 2, showing an arrangement of connection lines.

FIG. 8A is a side view showing the entire configuration of a conventional grinder, and FIG. 8B is a side cross-sectional view showing the vicinity of a connecting portion between a main body 62 and a handle 64.

FIG. 9 is a sectional view taken in the direction of arrows IX-IX shown in FIG. 8;

[Explanation of symbols]

 2 Body part 5 Handle part 5H Handle center hole 20 Protrusion 21, 22 ... Receiving protrusion 24 ... Thin plate Part 25: Connection space 31, 32, 33, 34 ... Rib

Claims (2)

(57) [Claims] A rotary positioning mechanism for a power tool having a main body, a handle connected to the main body, and rotatable with respect to the main body, wherein the rotary positioning mechanism is provided on one of the main body and the handle. A second fitting portion provided on the other of the first fitting portion, the main body, and the handle portion, the second fitting portion being capable of being fitted to the first fitting portion, and being provided corresponding to the rotation orbit of the first fitting portion. And at least one of the first fitting portion and the second fitting portion has elasticity, and the first fitting portion and the second fitting portion are based on the elasticity. The handle is positioned with respect to the main body, the handle is positioned with respect to the main body , and the connection between the main body and the handle is connected to the main body.
A first fitting portion and a second fitting portion for rotating the handle portion;
A connecting portion space for preventing a contact load from being applied to the first fitting portion ; the second fitting portion is constituted by two projections;
Is a projection that can be fitted into the recess between the two projections of the second fitting portion
Is configured, power tool, wherein the handle portion positioning mechanism as. 2. A power tool handle positioning mechanism according to claim 1, wherein the main body is provided with a motor, and the handle is provided with a switch for controlling the driving of the motor. A connection line for electrically connecting the motor and the switch unit is disposed so as to pass through a rotation center point of the handle unit with respect to the main body unit or near the rotation center point, and the main body unit includes the motor and the handle unit. a connecting wire holding portion located between, contact being constituted by a plurality of ribs
The connecting line holding portion is provided, and the plurality of ribs constituting the connection line holding portion are arranged so as to be offset from each other in the upward direction from the rotation center point, and downward from the rotation center point, A handle part positioning mechanism for a power tool, wherein the connection lines are held in a state where they are displaced from each other stepwise, and the connection lines are held by ribs constituting a connection line holding portion.