JPH09387A - Cab device of construction equipment - Google Patents

Abstract

PURPOSE: To restrain the vibration of an armrest member to the minimum limit. CONSTITUTION: In a cab device provided with a seat 8 to be seated by a driver M, a backrest 9 formed on the rear part of the seat 8, an armrest member 20 on which the driver M seated on the seat rests his elbow and an operating lever 11 to be operated by the driver M in a cab 3 of construction equipment, the armrest member 20 is disposed separatively from the backrest 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driver's seat device provided in a construction machine such as a crawler hydraulic excavator, and more particularly to reducing driver's fatigue.

[0002]

2. Description of the Related Art A crawler type hydraulic excavator is shown in FIG.
As shown in FIG. 2, the lower traveling body 1 having an endless track and the upper revolving body 2 rotatably provided on the lower traveling body 1 are provided, and a driver's cab 3 is provided in a front portion of the upper revolving body 2. At the same time, the boom 4 is connected so as to be able to rise and fall. An arm 5 is rotatably connected to the tip of the boom 4, and a bucket 6 is rotatably connected to the tip of the arm 5.

As shown in FIG. 7, a driver's seat device S'is installed on the floor plate 3a of the cab 3. Driver's seat device S '
Is a seat 8 supported on the floor plate 3a through support legs 7,
A backrest 9 connected to the rear portion of the seat 8, an armrest (armrest member) 10 attached to the backrest 9, and a lever stand having an operation lever 11 and supported on both sides of the support leg 7 (only one is shown). It consists of and. The support legs 7, the seat 8, the backrest 9, and the armrest 10 are provided with adjustment mechanisms so that they can be adjusted to positions suitable for the physique of the driver. An operation lever 12 and a footrest 13 are installed on the floor plate 3a in front of the driver's seat device S '.

A driver M sitting on the seat 8 operates the operating lever 11 to operate the boom 4, the arm 5 and the bucket 6.
While excavating work and turning the upper revolving structure 2,
The operating lever 12 is operated to perform a traveling operation. Although various vibrations are transmitted from the vehicle body to the driver M during work, the driver M is stabilized by the seat 8, the backrest 9, the armrests 10, the footrests 13 and the floor plate 3a.

[0005]

When excavating work by operating the operating lever 11, the elbow of the driver M is supported by the armrest 10 as shown in the drawing. However, in general, the driver M
Since he / she operates the lever and the like while gazing at the lower front, he often takes a forward leaning posture during work and his back often separates from the backrest 9. At this time, the driver M keeps his / her own stability with the seat 8 and the footrest 13, but the backrest 9 not in contact with the driver M is very swayable, and the swaying is caused by the armrest directly connected to the backrest 9. 10 is transmitted. Since the driver M tries to stabilize the armrest 10 by pushing it with his / her elbow, extra force is required,
Fatigue accelerates. In addition, since the worker's arm is likely to swing via the armrest 10, there is also a problem that the work efficiency is reduced at the time of work requiring fine operation such as slope finishing or horizontal excavation.

An object of the present invention is to provide a driver's seat device for a construction machine in which vibration of an armrest member is suppressed to a minimum.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to FIG. 1 showing an embodiment. In the present invention, a seat 8 on which a driver M sits down and a backrest 9 provided at the rear portion of the seat 8 are provided. An armrest member 20 on which the driver M seated on the seat 8 places his elbows
And the operating lever 11 operated by the driver M, and is applied to a driver's seat device installed in the operator's cab 3 of a construction machine.
And the armrest member 20 is arrange | positioned apart from the backrest 9, and this solves the said problem. In the invention of claim 2, the support member 7 for supporting the seat 8 on the floor surface 3a of the cab 3 is provided.
The armrest member 20 is attached to the. The invention of claim 3 further comprises an adjusting mechanism (14, 16, 21a, 21b) for adjusting the height position of the armrest member 20. The invention according to claim 4 further comprises an adjusting mechanism for adjusting the height position of the armrest member 20 and the angular position in the longitudinal direction of the cab. The invention of claim 5 further comprises an adjusting mechanism (FIG. 4) for adjusting the height position of the armrest member and the position in the front and rear direction of the cab.

[0008]

Since the armrest member 20 is arranged apart from the backrest 9, even if the backrest 9 vibrates during work, the vibration is not transmitted to the armrest member 20.

In the means and means for solving the above problems which explain the constitution of the present invention, the drawings of the embodiments are used to make the present invention easy to understand. However, the present invention is not limited to this.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to the driver's seat device of the crawler type hydraulic excavator of FIG. 6 will be described with reference to FIGS. Figure 1 shows the cab 3 of a crawler hydraulic excavator
2 is a side view showing the inside of a, FIG. 2 is an enlarged view of a main part thereof, and FIG. 3 is a view seen from the direction III in FIG. The same parts as those in FIG. 5 are designated by the same reference numerals, and different points will be mainly described.

A bracket 14 having a screw hole 14a is provided on a side portion of an upper metal fitting 7a of a holding leg 7 which constitutes a driver's seat device S.
Is fixed to the bracket 14, and an armrest member 20 having strength and rigidity that does not deform under the weight of a human being is attached so that the height and the angle can be adjusted. Armrest member 20
Is composed of a mounting portion 21 and a cushion 22 fixed to the upper end of the mounting portion 21, and the mounting portion 21 is formed with a vertical long groove 21a and a plurality of horizontal relief grooves 21b connected to the long groove 21a. ing. Bracket 14
Is provided with a screw hole 14a at a predetermined position.
The armrest member 20 is fixed to the bracket 14 by screwing the screw 16 into the screw hole 14 a through the escape groove 21 b of No. 1. The bracket 14 and the armrest member 20 are also provided on a side portion opposite to the driver's seat device S. That is, the armrest members 20 are located on both sides of the driver's seat device S with the seat 8 interposed therebetween.

According to the above construction, the height and angle of the armrest member 20 can be adjusted according to the physique of the driver M. For example, from the state of FIGS. 2 and 3, for example, the armrest member 20.
To adjust the height of the screw 16, first loosen the screw 16 and then move the armrest member 20 to the right in FIG. 2 to relatively move the shaft portion of the screw 16 into the long groove 21a. Then, the armrest member 20 is moved up and down along the long groove 21a, and when the armrest member 20 reaches a desired height, the armrest member 20 is moved leftward in FIG. 2 to relatively move the shaft portion of the screw 16 to one of the escape grooves 21b. , Tighten the screws 16 to fix. To adjust the angle of the armrest member 20,
With the shaft portion of the screw 16 positioned in the escape groove 21b, the armrest member 20 may be rotated about the screw 16 in the arrow direction, and the screw 16 may be tightened at the desired rotation position.

At the time of excavation work, as shown in FIG. 1, the left and right elbow portions of the driver M are provided with the cushions 2 of the left and right armrest members 20.
2 and are respectively supported by the armrest member 20.
At this time, the backrest 9 which is not in contact with the back of the driver M is very likely to swing, but since the armrest member 20 is not directly connected to the backrest 9, the swing of the backrest 9 is not transmitted to the armrest member 20. On the other hand, since the weight of the driver M is applied to the support leg 7 on which the armrest member 20 is supported via the seat 8, the support leg 7 hardly shakes and almost no shake is transmitted to the armrest member 20. . Therefore, the driver M does not need to press and stabilize the armrest 10 with the elbow portion as in the conventional case, and fatigue can be reduced. In addition, work efficiency does not decrease even during work requiring fine operations such as slope finishing and horizontal excavation.

In the structure of the above embodiment, the supporting leg 7 constitutes a supporting member, and the bracket 14, the screw 16, the long groove 21a and the horizontal clearance groove 21b constitute an adjusting mechanism.

4 and 5 are views showing another embodiment of the mounting portion of the armrest member, and other structures are the same as those of the previous embodiment. In the mounting portion 121 of FIG. 4, a plurality of horizontal clearance grooves 121b connected to the longitudinal long groove 121a are elongated toward the bottom. This is because it is generally necessary to move the position in the front-rear direction rearward as the height position of the armrest member is lowered. Especially, in the lower horizontal groove 121b, the position in the front-rear direction of the armrest member is also adjusted. It is possible. In the mounting portion 221 of FIG. 5, the horizontal clearance groove 2
The lengths of 21b are all the same, but since the long groove 221a is slanted, the lower the height position of the armrest member is, the more the front-back direction position thereof can be moved rearward, as described above.

The mounting position of the armrest member is not limited to the embodiment, and may be mounted on the floor surface or the side surface of the driver's seat, for example. Further, the position adjusting mechanism of the armrest member is not limited to the embodiment, and for example, a ball joint or the like may be used. Furthermore, although the crawler type hydraulic excavator has been described above, the present invention can be applied to other construction machines in which the same problem may occur.

[0017]

According to the present invention, since the armrest member is arranged apart from the backrest, even if the backrest vibrates during work, the vibration is not transmitted to the armrest member. Therefore, the driver does not need an extra force for pressing the armrest member, and the fatigue can be reduced, and the efficiency of the work requiring the fine operation of the operation lever can be improved.
If the armrest member is attached to the support member that supports the seat on the floor of the driver's cab, the vibration of the armrest member can be suppressed to a minimum, and a large-scale attachment mechanism is not required, so that the cost increase can be suppressed. If the height position and angle of the armrest member or the position in the front-rear direction can be adjusted according to the physique of the driver, fatigue can be further reduced.

[Brief description of drawings]

FIG. 1 is a side view showing a driver's seat device according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a view as seen from a direction III in FIG. 2;

FIG. 4 is a view showing another embodiment of the mounting portion of the armrest member.

FIG. 5 is a view showing still another embodiment of the mounting portion of the armrest member.

FIG. 6 is a diagram showing an example of a crawler hydraulic excavator.

FIG. 7 is a side view showing a conventional driver's seat device.

[Explanation of symbols]

 3 Driver's cab 3a Floor surface 7 Support leg 8 Seat 9 Backrest 11 Operation lever 14 Bracket 14a Screw hole 20 Armrest member 21 Mounting part 21a Long groove 21b Horizontal clearance groove 22 Cushion M Driver S Driver seat device

Claims (5)

[Claims] 1. A seat on which a driver sits down, a backrest provided at a rear portion of the seat, an armrest member on which the driver seated on the seat rests an elbow, and an operation lever operated by the driver. A driver's seat device provided in a driver's cab of a construction machine, wherein the armrest member is arranged apart from the backrest. 2. The driver's seat device for a construction machine according to claim 1, wherein the armrest member is attached to a support member for supporting the seat on the floor surface of the operator's cab. 3. The apparatus according to claim 1, further comprising an adjusting mechanism for adjusting a height position of the armrest member.
The driver's seat device of the construction machine described in. 4. The driver's seat device for a construction machine according to claim 1, further comprising an adjusting mechanism for adjusting a height position of the armrest member and an angular position in a driver's cab front-rear direction. 5. The driver's seat device for a construction machine according to claim 1, further comprising an adjusting mechanism for adjusting a height position of the armrest member and a position in a driver's cab longitudinal direction.