JP2003256058A - Electric lever device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric lever device capable of securing excellent operational feeling appropriate for various works. <P>SOLUTION: The electric lever device has an operation lever 3, a first potentiometer 13 for outputting an electric signal corresponding to an operation of the operation lever 3, a second potentiometer 15, an extension arm 16 for extending toward the first potentiometer 13 and a rotation arm 17 for integrally rotating with a rotation shaft 12 of the first potentiometer 13 and extending in a direction of the extension arm 16. A U-shape groove 20 is provided at a lower end of the rotation arm 16 and a projection 21 capable of relatively moving in the U-shape groove 20 is provided at an upper end of the rotation arm 16. A collar part of the U-shape groove 20 consists of a recessed collar part including a pair of first linear faces 24 parallel to each other and a pair of second linear faces 25 open downward. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric lever device which is provided in a construction machine such as a hydraulic excavator and has a rotary potentiometer which outputs an electric signal according to a swing operation of an operation lever.

[0002]

2. Description of the Related Art FIGS. 5A and 5B are explanatory views of a conventional electric lever device. FIG. 5A is a front view including a cross-sectional portion, and FIG. 5B is a cross-sectional portion viewed from the left in FIG. Side view, FIG.
FIG. 6 is an enlarged view of a main part of the conventional technique shown in FIG.

The prior art shown in FIG. 5 is an electric lever device provided in a construction machine, for example, a hydraulic excavator, in which a main body 2 is provided in a housing 1 forming an outer shell, and a swingable operation is performed above the main body 2. A lever 3 is provided. The lower end of the operating lever 3 is connected to the universal joint 4. The lower end of the operating lever 3 is provided with a first gimbal 6 and a second gimbal 7 which are arranged in a so-called X-Y direction in a horizontal plane and are swingable integrally with the operating lever 3, and a cam. 5 are provided.

The rotating shafts 8 and 9 of the first gimbal 6 and the second gimbal 7 are set at the same height position as the rotation center 10 of the universal joint 4.

A bracket 11 is provided in the lower portion of the main body 2, and a rotary potentiometer for outputting an electric signal according to the swing of the first gimbal 6 by the swing operation of the operating lever 3, that is, a first potentiometer is attached to the bracket 11. A first potentiometer 13 and a rotary potentiometer that outputs an electric signal according to the swing of the second gimbal 7 by the swing operation of the operation lever 3, that is, a second potentiometer 15 are provided.

The rotating shaft 8 and the second shaft of the first gimbal 6 described above.
Extension arms 16 and 18 extending toward the first potentiometer 13 and the second potentiometer 15 are integrally provided on each of the rotating shafts 9 of the gimbal 7. In addition, the rotary shaft 1 of the first potentiometer 13
2. The rotary shafts 14 of the second potentiometer 15 are integrally provided with rotary arms 17 and 19 extending toward the corresponding extension arms 16 and 18, respectively.

A plurality of push rods 22 and a spring 23 for holding these push rods 22 are provided at the lower end of the cam 5 described above.

The extension arm 16 and the rotating arm 17, and the extension arm 18 and the rotating arm 19 are respectively provided with a combination of a U-shaped groove and a protrusion capable of relatively moving in the U-shaped groove. It is connected. For example, extension arm 1
6 and the rotary arm 17 are connected via a combination of a U-shaped groove 40 provided at the lower end of the extension arm 16 and a protrusion 41 provided at the upper end of the rotary arm 17.
In the U-shaped groove 40, as shown in FIG. 6, the two edge portions facing each other so as to sandwich the protrusion 41 are entirely formed by the straight surface 42. As the extension arm 16 swings, the protrusion 41 relatively slides in the U-shaped groove 40, so that the rotating arm 17 provided integrally with the protrusion 41.
Is designed to rotate. The same applies to the connection between the extension arm 18 and the rotating arm 19.

In this prior art, when the operating lever 3 is swung, for example, in a direction along the plane of FIG. 5A, the first gimbal 6, the rotary shaft 8 and the extension arm 16 are moved to the plane of FIG. When the projection 41 relatively slides in the U-shaped groove 40 of the extension arm 16 along the direction along which the rotation arm 17 and the rotation shaft 12 rotate integrally, As a result, the first potentiometer 13 outputs an electric signal corresponding to the operation amount of the operation lever 3.

Similarly, when the operation lever 3 is swung in the direction orthogonal to the paper surface of FIG. 5A, the second gimbal 7, the rotating shaft 9 and the extension arm 18 are orthogonal to the paper surface of FIG. The swing arm 19 and the rotary shaft 14 integrally rotate in response to the swinging movement in the direction, whereby an electric signal corresponding to the operation amount of the operating lever 3 is output from the second potentiometer 15. To be done.

When the operating lever 3 is operated in the directions different from the above-mentioned directions, the first potentiometer 13 and the second potentiometer 13 are operated.
An electric signal is output from each of the potentiometers 15.

In this way, the first potentiometer 1
3. The operation direction of the operation lever 3 and the operation amount are obtained by the calculation performed based on the electric signal output from the second potentiometer 15.

The corresponding directional control valve (not shown) is switched according to the operating direction and the operation amount, and the pressure oil discharged from the hydraulic pump (not shown) is supplied to the corresponding hydraulic pressure (not shown) through the corresponding directional control valve. The hydraulic actuator is supplied to the actuator to operate. By the operation of this hydraulic actuator, a work machine including, for example, a boom and an arm is driven to carry out a desired work.

FIG. 8 shows the operation amount of the operation lever 3, that is, the lever swing angle, and the rotating arm 1 connected to the first and second potentiometers 13 and 15 in the above-mentioned conventional technique.
It is a characteristic view which shows the relationship with the sensor rocking | swiveling angle which is the rocking | swiveling angle of 7,19.

As shown in FIG. 8, the lever swing angle is 1
The linearity is maintained up to about 5 °, and the lever swing angle and the sensor swing angle are in a proportional relationship, but if the angle is larger than that, the inclination gradually increases, and the linearity is impaired. Go.

FIG. 7 is a diagram showing another example of the main part shown in FIG. Conventionally, a combination of a U-shaped groove and a protrusion as shown in FIG. 7 has also been proposed.

In the structure shown in FIG. 7, for example, a U-shaped groove 43 is provided at the upper end of a rotary arm 17 which is provided integrally with the rotary shaft 12 of the first potentiometer 13 and is provided integrally with the first gimbal 6. A protrusion 4 is provided on the lower end of the extension arm 16.
4 are provided. In the U-shaped groove 43, as shown in FIG. 7, the two edge portions facing each other so as to sandwich the projection 44 are entirely formed by a straight surface 45. As the extension arm 16 swings, the protrusion 44 relatively slides in the U-shaped groove 3 so that the rotating arm 17 provided with the U-shaped groove 43 is rotated. There is. By the rotation of the rotation arm 17, the electric signal is output from the first potentiometer 13 as described above.

FIG. 9 is a characteristic diagram showing the relationship between the lever swing angle constructed as shown in FIG. 7 and the sensor swing angle.

As shown in FIG. 9, the lever swing angle is 1
Linearity is almost maintained in the range up to 5 °,
The lever operation amount and the sensor swing angle are in a proportional relationship, but if the lever operation amount is larger than that, the inclination becomes gradually smaller and the linearity thereof is impaired.

[0020]

In the above-mentioned prior art, the combination of the U-shaped grooves 40 and 43 connecting the extension arms 16 and 18 and the rotating arms 17 and 19, the projections 41 and 44, and the like, As illustrated in FIGS. 8 and 9, when the operation angle of the operation lever 3, that is, the lever swing angle increases,
The linearity of the sensor swing angle with respect to the lever swing angle cannot be obtained. Therefore, even if the lever swing angle is large,
The operation feeling is deteriorated in the work for ensuring the linearity of the sensor swing angle corresponding to the lever swing angle.

Further, in the above-mentioned prior art, since the relationship of the sensor swing angle with respect to the lever swing angle is one straight line which is approximate to a straight line, the operation of the hydraulic actuator operated by the conventional electric lever device is operated. In some cases, it may be difficult to obtain an operation feeling suitable for various kinds of work performed via the.

For example, the characteristic line F of FIG.
As shown by the characteristic line G in the figure (b), in consideration of the fine operation,
For work in which it is desirable to set a straight line with a small inclination in a region where the operation angle of the operation lever 3, that is, a lever swing angle is small, and to set a straight line or a curve with a large inclination in a region where the operation angle is larger than a predetermined angle, The above-mentioned conventional technology cannot meet the demand.

In the prior art, there is a concern that the work accuracy of various works performed through the operation of the electric lever device may be deteriorated due to the troubles related to the operation feeling as described above.

The present invention has been made from the above-mentioned actual state of the art, and an object thereof is to provide an electric lever device capable of ensuring an operation feeling suitable for various works.

[0025]

In order to achieve the above object, the present invention relates to an operating lever, a rotary potentiometer for outputting an electric signal according to a swinging operation of the operating lever, and the operating lever. Swing arm and an extension arm extending toward the rotary potentiometer and a rotary arm extending integrally with the rotary shaft of the rotary potentiometer and extending toward the extension arm. And an extension arm and a rotation arm
In an electric lever device that connects via a combination of a U-shaped groove and a protrusion capable of relatively moving in the U-shaped groove, an edge portion of the U-shaped groove with which the protrusion slides is convex The configuration is such that at least one of the edge portion and the concave edge portion is set.

According to the present invention thus constructed, when the operation lever is operated to swing, the extension arm integrally swings, and the swing arm swings through the combination of the U-shaped groove and the protrusion. The rotary potentiometer outputs an electric signal according to the operation amount of the operation lever.

Here, if the work performed through the operation of the electric lever device is a work in which the characteristic of the electric signal output from the rotary potentiometer is desired to be a predetermined straight line, for example, experience By previously setting the edge portion of the U-shaped groove of the portion corresponding to the lever swing angle at which the linearity that is grasped in advance is set to at least one of the convex edge portion and the concave edge portion, It is possible to make the characteristics substantially coincident with the straight line. As a result, the linearity of the characteristic of the electric signal output from the rotary potentiometer can be ensured over a wide swing angle range, and the operation feeling suitable for the corresponding work can be ensured.

Further, the work carried out through the operation of the electric lever device becomes a straight line having a predetermined small inclination in a region where the characteristic of the electric signal output from the rotary potentiometer is, for example, a small operation amount of the operation lever. Therefore, in the case of a work in which a straight line or a curved line having a large inclination is desired in a region where the operation amount is large or more, it is necessary to set the edge of the U-shaped groove in advance so as to correspond to the change in the inclination of the straight line. By using at least one of the convex edge portion and the concave edge portion, it is possible to obtain a characteristic that appropriately changes from a single straight line, and to secure an operation feeling suitable for the corresponding work.

In order to obtain the characteristics suitable for the corresponding work, whether the edge of the U-shaped groove is set to be a convex edge, a concave edge, or a convex edge and a concave edge. Whether to set the combination depends on whether the U-shaped groove is provided on the extension arm or the pivot arm. It also depends on the form of the characteristics mentioned above.

In any case, according to the present invention, by setting the edge of the U-shaped groove to at least one of the convex edge and the concave edge in accordance with various works, the corresponding situation can be obtained. It is possible to secure an operation feeling suitable for work.

The edge portion of the U-shaped groove described above is composed of a convex edge portion including a first straight surface and a second straight surface inclined with respect to the first straight surface, or a concave edge portion. It may be composed of a curved surface or a curved surface.

Further, the above-mentioned U-shaped groove may be provided on the extension arm and the protrusion may be provided on the rotating arm. Conversely, the U-shaped groove may be provided on the rotating arm and the protrusion may be provided on the extending arm. Good.

The present invention is conveniently provided in a construction machine as an operating device for a directional control valve for switching and operating various hydraulic actuators.

[0034]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an electric lever device of the present invention will be described below with reference to the drawings.

1A and 1B are explanatory views showing an embodiment of an electric lever device of the present invention. FIG. 1A is a front view including a sectional portion, and FIG. 1B is seen from the left side of FIG. FIG. 2 is a side view including a cross-sectional portion, and FIG. 2 is an enlarged view of a main part of the embodiment shown in FIG.

In these FIGS. 1 and 2, the same parts as those in FIGS. 5 and 6 described above are indicated by the same reference numerals.

Although overlapping with the above, the embodiment shown in FIGS. 1 and 2 is also provided for a construction machine, for example, a hydraulic excavator, and has a main body 2 inside a housing 1 forming an outer shell,
A swingable operation lever 3 is provided above the main body 2. The lower end of the operating lever 3 is connected to the universal joint 4. A first gimbal 6, which is arranged at the lower end of the operation lever 3 in the so-called XY direction in a horizontal plane and is swingable integrally with the operation lever 3,
The second gimbal 7 is provided and the cam 5 is provided.

The rotation axes 8 and 9 of the first gimbal 6 and the second gimbal 7 are set at the same height position as the rotation center 10 of the universal joint 4.

A bracket 11 is provided on the lower portion of the main body 2, and a rotary potentiometer for outputting an electric signal corresponding to the swing of the first gimbal 6 by the swing operation of the operating lever 3, that is, a bracket 11 is provided on the bracket 11. A first potentiometer 13 and a rotary potentiometer that outputs an electric signal according to the swing of the second gimbal 7 by the swing operation of the operation lever 3, that is, a second potentiometer 15 are provided.

The first potentiometer 1 is attached to each of the rotary shaft 8 of the first gimbal 6 and the rotary shaft 9 of the second gimbal 7.
3 and extension arms 16 and 18 respectively extending toward the second potentiometer 15 are integrally provided. Further, the rotary shaft 12 of the first potentiometer 13 and the rotary shaft 14 of the second potentiometer 15 are integrally provided with rotary arms 17 and 19 extending toward the corresponding extension arms 16 and 18, respectively. It is provided.

At the lower end of the cam 5, a plurality of push rods 22 and a spring 2 for holding these push rods 22 are provided.
3 and 3 are provided.

The above-mentioned configuration is shown in FIG.
It is the same as that shown in FIG. In the present embodiment, the U of the combination of the U-shaped groove and the projection connecting the corresponding ones of the extension arms 16 and 18 and the rotating arms 17 and 19 respectively.
Characterized by a V-shaped groove.

That is, the edge of the U-shaped groove with which the projection is in sliding contact is set to at least one of the convex edge and the concave edge. For example, as shown in FIGS.
A U-shaped groove 20 is provided at the lower end of an extension arm 16 connected to the rotating shaft 8 of the gimbal 6, a protrusion 21 is provided on a rotating arm 17 connected to the rotating shaft 12 of the first potentiometer 13, and a U-shaped groove is formed. The edges of the groove 20 have a pair of first straight surfaces 24 formed substantially parallel to each other, and a pair of second straight surfaces 25 that are inclined with respect to the first straight surfaces 24 and open downward.
And a convex edge portion including and.

The extension arm 18 connected to the rotary shaft 9 of the second gimbal 7 and the rotary shaft 1 of the first potentiometer 15.
The connecting portion with the rotating arm 19 connected to the 4 is also set in the same manner as described above, for example. That is, a U-shaped groove is provided at the lower end of the extension arm 18, and a protrusion is provided on the rotating arm 19. Further, the U-shaped edge portion is configured by a convex edge portion including a first straight surface and a second straight surface inclined with respect to the first straight surface.

In one embodiment having such a configuration, when the operation lever 3 is swung in the direction along the plane of the drawing in FIG. 1A, for example, the first gimbal 6, the rotary shaft 8 and the extension arm 16 are moved. The first linear surface 24 and the second linear surface in the U-shaped groove 20 of the extension arm 16 are integrally swung in a direction along the paper surface of FIG. The protrusion 21 moves relatively while contacting the surface 25. As a result, the rotary arm 17 and the rotary shaft 12 rotate integrally. That is, an electric signal corresponding to the operation amount of the operation lever 3 is output from the first potentiometer 13.

Similarly, when the operating lever 3 is swung in the direction orthogonal to the paper surface of FIG. 1A, the second gimbal 7, the rotary shaft 9 and the extension arm 18 are moved to the paper surface of FIG. The swing arm 19 and the rotary shaft 14 integrally rotate in response to the swinging in a direction orthogonal to the second potentiometer. It is output from 15.

When the operating lever 3 is operated in the directions different from the above-mentioned directions, the first potentiometer 13 and the second potentiometer 13 are operated.
An electric signal is output from each of the potentiometers 15.

In this way, the first potentiometer 1
3, the operation direction of the operation lever 3 and the operation amount are obtained by the calculation performed based on the electric signal output from the second potentiometer 15.

A corresponding directional control valve (not shown) is switched according to the operating direction and operation amount, and pressure oil discharged from a hydraulic pump (not shown) is supplied to a corresponding hydraulic pressure (not shown) through the corresponding directional control valve. It is supplied to an actuator, for example, a boom cylinder, an arm cylinder, etc., and these boom cylinders, arm cylinders, etc. operate.

By operating these boom cylinders, arm cylinders, etc., the front working machine composed of the boom, arms, etc. is driven and desired work is carried out.

FIG. 4 shows the lever swing angle and the first and second potentiometers 13 in each of this embodiment, another example shown in FIG. 3 described later, and the prior art shown in FIGS. FIG. 6 is a characteristic diagram showing a relationship with a sensor swing angle which is a swing angle of rotary arms 17 and 19 connected to 15.

D in FIG. 4 is the characteristic line of the prior art shown in FIGS. 5 and 6 and corresponds to that shown in FIG. A of FIG. 4 is a characteristic line of the embodiment shown in FIGS.

In this embodiment, the edge of the U-shaped groove 20 of the extension arm 16 is provided with a pair of first straight surfaces 24 formed substantially parallel to each other, and a pair of first straight surfaces 24 connected to the first straight surfaces 24 and opened downward. The lever swing angle is 0 ° to 10 because it is configured by the second straight surface 25, that is, because the first straight surface 24 and the second straight surface 25 form a convex edge portion.
It is possible to secure the linearity of the sensor swing angle with respect to the lever swing angle in a small operation area of about 10 °
The above-mentioned linearity in a large operation area of about 22 ° can also be secured. That is, the relationship between the lever swing angle and the sensor swing angle can be made substantially proportional over the entire operation range of 0 ° to 22 °.

As described above, in this embodiment, when the operation lever 3 is rocked, the extension arms 16 and 18 are integrally formed.
Oscillates, and the rotating arms 17 and 19 rotate via a combination of the U-shaped groove 20 and the protrusion 21 and the like, and the first potentiometer 13 and the second potentiometer 15 correspond to the operation amount of the operation lever 3. An electric signal is output.

The characteristic of the electric signal output at this time becomes a straight line as shown by the characteristic line A in FIG. 4, and the relation between the lever swing angle and the sensor swing angle is shown in a wide operation amount range of the operating lever 3. It is possible to secure an operation feeling that is suitable for work that requires a proportional relationship. Thereby, the work accuracy of the corresponding work can be improved.

FIG. 3 is a diagram showing another example of the main part shown in FIG.

In FIG. 3A, for example, a U-shaped groove 26 is provided in the rotary arm 17 connected to the rotary shaft 12 of the first potentiometer 13 and is connected to the rotary shaft 8 of the first gimbal 6. The protrusion 27 is provided at the lower end of the extension arm 16, and the edge of the U-shaped groove 26 is inclined with respect to the pair of first linear surfaces 28 that are formed substantially in parallel with each other, and the upper portion It is configured by a convex edge portion including a pair of second straight surfaces 29 that open toward each other.

In the structure as shown in FIG. 3 (a), the lever operation angle is 0 as shown by the characteristic line B in FIG.
The linearity is almost maintained in a small operation area of about 10 ° to 10 °, and the lever swing angle and the sensor swing angle have a roughly proportional relationship, but in a larger operation area, the inclination is smaller than before. It becomes a changing relationship. Therefore, it is possible to secure the operation feeling suitable for the work for which such characteristics are desired and improve the work accuracy of the corresponding work.

Further, in FIG. 3B, for example, a U-shaped groove 30 is provided at the lower end of the extension arm 16, a protrusion 31 is provided on the rotating arm 17, and the edge of the U-shaped groove 30 is The pair of first straight surfaces 32 formed substantially parallel to each other and the first
It is configured to have a concave edge portion that is inclined with respect to the straight surface 32 and that is closed downward and includes a pair of slightly inclined second straight surfaces 33.

In the structure shown in FIG. 3 (b), the linearity is shown in the range of the lever swing angle from 0 ° to 10 ° as shown by the characteristic line C in FIG. The lever swing angle and the sensor swing angle are approximately proportional to each other, but when the lever swing angle and the sensor swing angle are larger than that, the inclination changes to be larger than before. Therefore, it is possible to secure the operation feeling suitable for the work for which such characteristics are desired and improve the work accuracy of the corresponding work.

In the above description, the edge portion of the U-shaped groove 20 is formed as a convex edge portion formed by the linear surfaces 24 and 25 which are continuously provided,
The edge of the U-shaped groove 26 is formed as a convex edge formed by the linear surfaces 28 and 29 that are continuously provided, and the edge of the U-shaped groove 30 is formed by the linear surfaces 32 and 33 that are continuously provided. Although it is formed on the concave edge, these convex edge and concave edge may be formed on a curved surface instead of a combination of straight surfaces.

[0062]

According to the present invention, the operation feeling suitable for various works can be secured, and the work accuracy of various works can be improved as compared with the prior art.

[Brief description of drawings]

1A and 1B are explanatory views showing an embodiment of an electric lever device of the present invention, in which FIG. 1A is a front view including a cross-sectional portion, and FIG. 1B is a cross-sectional portion viewed from the left side of FIG. 1A. It is a side view containing.

FIG. 2 is an enlarged view of a main part of the embodiment shown in FIG.

FIG. 3 is a diagram showing another example of the main part shown in FIG.

FIG. 4 is a lever swing angle in one embodiment shown in FIG. 1, another example shown in FIG. 3, and a conventional technique, and a sensor swing angle that is a swing angle of a swing arm connected to a potentiometer. It is a characteristic view which shows the relationship with.

5A and 5B are explanatory views of a conventional electric lever device, FIG. 5A is a front view including a cross-sectional portion, and FIG. 5B is a side view including a cross-sectional portion as viewed from the left side of FIG. .

FIG. 6 is an enlarged view of a main part of the conventional technique shown in FIG.

FIG. 7 is a diagram showing another example of the main parts shown in FIG.

8 is a characteristic diagram showing a relationship between a lever swing angle and a sensor swing angle which is a swing angle of a rotary arm connected to a potentiometer in the conventional technique shown in FIG.

9 is a characteristic diagram showing a relationship between a lever swing angle and a sensor swing angle in another example of the main part shown in FIG. 7. FIG.

FIG. 10 is a characteristic diagram showing another example of the output voltage characteristic of the potentiometer with respect to the lever swing angle that has been conventionally required.

[Explanation of symbols]

1 Housing 2 Main Body 3 Operating Lever 4 Universal Joint 5 Cam 6 First Gimbal 7 Second Gimbal 8 Rotation Shaft 9 Rotation Shaft 10 Rotation Center 11 Bracket 12 Rotation Shaft 13 First Potentiometer (Rotation Potentiometer) 14 Rotation Shaft 15 Second Potentiometer (Rotary potentiometer) 16 Extension arm 17 Rotation arm 18 Extension arm 19 Rotation arm 20 U-shaped groove 21 Protrusion 22 Push rod 23 Spring 24 First straight surface 25 Second straight surface 26 U-shaped groove 27 Protrusion 28th 1 straight surface 29 second straight surface 30 U-shaped groove 31 protrusion 32 first straight surface 33 second straight surface A characteristic line B characteristic line C characteristic line

Continued front page    (72) Inventor Nobuhiko Ichiki             Hitachi Construction Machinery Co., Ltd.             Ceremony Company Tsuchiura Factory F-term (reference) 2D003 AA01 AB02 AB03 AB04 AC06                       BA01 BA02 DA04 DB04                 3D030 DB95                 3J070 AA04 BA11 BA51 CB03 CC02                       CC04 CC07 CC12 CC63 CC64                       CC71 CE01 DA21 EA11

Claims (7)

[Claims] 1. An operating lever, a rotary potentiometer for outputting an electric signal according to a swinging operation of the operating lever, and a swing potentiometer integrally swinging with the operating lever and extending toward the rotary potentiometer. And an extension arm that rotates integrally with the rotary shaft of the rotary potentiometer and extends in the direction of the extension arm. In an electric lever device that connects via a combination of a U-shaped groove and a protrusion that can relatively move within the U-shaped groove, an edge portion of the U-shaped groove that the protrusion is in sliding contact with is protruded. An electric lever device, wherein at least one of the edge portion and the concave edge portion is set. 2. The edge of the U-shaped groove has a first straight surface,
The electric lever device according to claim 1, comprising a convex edge portion including a second straight surface inclined with respect to the first straight surface. 3. The edge of the U-shaped groove has a first straight surface,
The electric lever device according to claim 1, comprising a concave edge portion including a second straight surface inclined with respect to the first straight surface. 4. The electric lever device according to claim 1, wherein an edge portion of the U-shaped groove has a curved surface. 5. The U-shaped groove is provided in the extension arm,
The electric lever device according to claim 1, wherein the protrusion is provided on the rotating arm. 6. The turning arm is provided with the U-shaped groove,
The electric lever device according to claim 1, wherein the protrusion is provided on the extension arm. 7. The electric lever device according to claim 1, which is provided in a construction machine.