JPH0227008Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a working seat for a hydraulic excavator.

Recently, some operating seats for hydraulic excavators are equipped with an armrest arm, and the operator can operate the operation lever by grasping the operating lever while resting his/her elbow on the armrest arm. Therefore, such an armrest arm can significantly reduce operator fatigue during long hours of work, and since the user can operate the work control lever by fixing his elbow to the armrest arm, it is also easy to perform fine operations on the work control lever. It has the following advantages. However, although this armrest arm makes it easier to perform fine operations on the work operation lever, it is instead fixed and restrained to the armrest arm, making it unsuitable for operating normal large work operation levers. has.

For this reason, conventionally,
As described in the above publication, a work driver's seat has been proposed in which an armrest arm is configured to be able to reciprocate back and forth.

According to this device, the driver can operate the operating lever while resting his elbow on the armrest that can be moved forward and backward, which reduces fatigue even during long hours of work, and has the advantage of allowing fine control to be performed easily. be.

However, in the conventional case described in the above-mentioned publication, the armrest, which is movable back and forth, is provided in the rear half above the tank serving as the base.

With this configuration, even if the armrest, which can be moved forward and backward, is moved forward, it will only move forward to the center of the tank that serves as the base, and even if you rest your elbow on it, your hand will not be able to operate the control lever. It may not reach the range.

In particular, hydraulic excavators are often used for excavating deep trenches, in which case the driver must lean forward to operate the control lever in order to peer into the trench. At this time, if the armrest on which the user rests his or her elbow is located further back than the middle of the seat, the user's hand will not be able to reach the control lever, resulting in a problem that the user will be unable to operate the control lever.

Furthermore, in the conventional case described in the above-mentioned publication, the armrests are movable only in the front and back directions, but some of the above-mentioned operating levers also require rocking operations in the left and right directions, so that the armrests can only be moved back and forth. Those that move only have the disadvantage of being restricted in the movement of the elbow for operation.

The present invention was developed based on these circumstances, and its purpose is to facilitate fine operation of the work operation lever, and to ensure that the operation lever can be operated reliably even when the driver leans forward. Go,
Furthermore, it is an object of the present invention to provide a working operator's seat for a hydraulic excavator which allows not only front and rear but also left and right operation, and in which the armrests do not get in the way when the elbows are removed.

In the present invention, the armrest arm is provided with a slide arm on the upper surface of the arm base so as to be able to reciprocate back and forth, and has an elastic member that urges the slide arm to stop at a neutral position in the front and back direction. When the slide arm is moved forward against the member, the tip of the slide arm can protrude further forward than the tip of the arm base, and the arm base or the slide arm can be moved in the left and right direction. The present invention is characterized by the provision of an elastic member that urges the arm base or the slide arm to stop at a neutral position in the left-right direction.

According to the present invention, since the slide arm can be moved forward, backward, left, and right, the user can place his/her elbow on the slide arm and move forward, backward, left, and right, thereby reducing operator fatigue even when fine operation of the control lever continues for a long time. can. In addition, when the slide arm is moved forward, the tip of the slide arm protrudes further forward than the tip of the arm base, so when excavating deep trenches with a hydraulic excavator, the operator cannot peer into the trench. Even if you lean forward to operate the control lever, the slide arm on which your elbow rests moves forward, allowing you to reach the control lever and operate it reliably. Even in this case, it can be moved left and right, increasing the operating range. In addition, this slide arm is biased by an elastic member so as to be stopped at neutral positions in the front and back, left and right, respectively, so when you release your elbow and release the slide arm, the slide arm automatically returns to the neutral position. It does not protrude to the front or side of the arm base and does not get in the way.

An embodiment of this invention will be described below with reference to FIGS. 1 to 6.

Fig. 1 shows a hydraulic excavator, in which 1 is a vehicle body, 2 is a swivel base, 3 is a boom, 4 is an arm, 5 is a bucket, and 3a is a boom cylinder, 4
a is an arm cylinder, and 5a is a bucket cylinder.

A work operation cab 7 for operating the excavation work is provided on the swivel base 2. As shown in FIG. 2, a work seat 8 for the operator is provided in the work cab 7, and in front of the work seat 8, for example, two
Book work operation levers 9 and 10 are provided.
One of these work operation levers 9 and 10
10 is for rotating the swivel base 2 and raising and lowering the boom 3, and 10 is for rotating the arm 4 and rotating the bucket 5.

The work driver's seat 8 is provided with a pair of armrest arms 11, 11. Each armrest arm 11, 11 has a hollow arm base 12, as shown in FIGS. 3 to 5.
and a slide arm 13, which is fitted onto the upper side of the arm base 12 so as to be able to reciprocate back and forth, as shown by the imaginary line in FIG.

A horizontal bar 14 is spanned within the distal end of the arm base 12, while a spring support plate 15 is fixed inside the distal end of the slide arm 13, and a horizontal bar 16 is fixed inside the rear end of the slide arm 13. It is being spanned. As is clear from FIGS. 3 and 4, the horizontal bar 16 is provided through guide grooves 17, 17 formed in the axial direction on both sides of the arm base 12, so that the horizontal bar 16 does not hinder the back and forth reciprocation of the slide arm 13. The spring support plate 15, the horizontal bar 14, and the horizontal bars 14, 16 are connected by coil springs 18, 18, respectively.
8, the slide arm 13 is normally held in the neutral position shown in FIG.

In this case, when the slide arm 13 is pushed forward against the biasing force of the coil springs 18, 18, the tip of the slide arm 13 is pushed forward against the biasing force of the coil springs 18, 18, as shown by the imaginary line in FIG. It is designed to protrude from the front.

On the other hand, the rear end of the arm base 12 is supported by the seat body 8a via a support pin 19.
In this embodiment, as shown in FIG. 5, the portion of the support pin 19 that passes through the arm base 12 is formed hollow. A guide groove 20 along the axial direction of the support pin 19 is formed on the upper outer circumferential surface of the support pin 19 in this hollow part, and a guide guide integrally protruding from the arm base 12 is formed in the guide groove 20. 21 is slidably fitted. Therefore, the arm base 12, that is, the armrest arm 11 has a sixth position corresponding to the length of the guide groove 20.
As shown by the imaginary line in the figure, it is movable left and right. Further, the guide guide and both inner ends of the support pin 19 are connected by coil springs 21, 21, respectively, so that the arm base 1
2 is normally held in the neutral position shown in FIG. Further, in this embodiment, an elbow pad 30 made of an elastic material such as rubber is attached to the upper surface of the slide arm 13 to prevent slipping.

According to one embodiment of this invention, the operator can move the slide arm 1 of each armrest arm 11.
3. While resting your elbows on the work levers 9,
10 operations can be performed, thereby reducing operator fatigue even during long hours of work. Further, since the elbow can be fixed on the slide arm 13, fine operation of the work operation levers 9 and 10 becomes easy. Moreover, in the above embodiment, the slide arm 13 is reciprocating back and forth, and the entire armrest arm 11 is movable left and right, so even if you put your elbow on the slide arm 13, the elbow will not move. It is not restricted by position. Therefore, while resting on your elbows,
Since the arm can be reciprocated back and forth and left and right together with the armrest arm 11, it is also possible to operate the normal large work operating levers 9 and 10, making the entire crane operation easier.

When excavating a deep trench with a hydraulic excavator, the operator leans forward to look into the trench, and in this position, the operating levers 9 and 1 are pressed down.
However, in this embodiment, the slide arm 13 on which the elbow rests can be moved far forward from the tip of the arm base 12, so the operator who leans forward has no hands on the operating levers 9 and 10. It can be accessed and operated reliably. In this case, since the slide arm 13 can be moved to the left and right while remaining projected forward, the operating range with the elbow resting on the slide arm 13 is widened.

Furthermore, the slide arm 13 is connected to the coil spring 1.
The urging forces of 8 and 18 automatically return to the neutral position in the longitudinal direction and stop the arm base 1.
2 is also automatically returned to the neutral position in the left and right direction by the biasing force of the coil springs 21, 21 and stopped, so when the operator releases his elbow, the slide arm 13 does not protrude forward and also protrudes sideways. and therefore does not get in the way.

Note that this invention is not limited to the above embodiment. For example, the support structure of the armrest arm 11 relative to the support pin 19 may be constructed as shown in FIGS. 7 and 8. That is, in this case,
The support pin 19 passes through a substantially drum-shaped elastic body 22 fitted to the base end of the arm base 12 . A held center shaft pin 23 is passed through. On the other hand, the structures of the arm base 12 and slide arm 13 are similar to those in the above-described embodiment. With this configuration, the armrest arm 11 can rotate left and right about the center pin 23 as shown by the imaginary line in FIG. That is, even in the case of this modification, the armrest arm 11 can be reciprocated not only back and forth but also left and right, and the same effects as in the first embodiment can be obtained.

In addition, in the above embodiment, the arm base 1
Although the slide arm 13 is configured to be movable left and right, the slide arm 13 may be configured to be able to reciprocate back and forth and left and right with respect to the arm base 12.

Furthermore, the work operator seat of this invention is not limited to one that handles only the two work operation levers 9 and 10;
It may be one that handles two or more work operation levers.

As explained above, according to this invention, operator fatigue can be reduced even when fine operation of the control lever continues for a long period of time, and the operator can look into the trench when excavating deep trenches with a hydraulic excavator. Even if you lean forward to operate the control lever, the slide arm on which your elbow rests moves forward, allowing you to reach the control lever and operate it reliably. Furthermore, since the slide arm or arm base is movable in the left and right directions, the operating range of the operating lever is widened, increasing ease of use. Furthermore, when the slide arm is released by releasing the elbow, the slide arm and arm base are biased by the elastic member and automatically return to the neutral position, so that they do not protrude forward or sideways, so they do not get in the way.

[Brief explanation of the drawing]

Figures 1 to 6 show an embodiment of this invention, with Figure 1 being a side view of the hydraulic excavator, Figure 2 being a perspective view of the operator's seat, Figure 3 being a cutaway view of the armrest arm, and Figure 3 being a cutaway view of the armrest arm. Figure 4 is a cross-sectional view taken along the line - in Figure 3, Figure 5 is a cross-sectional view taken along the line - in Figure 3, Figure 6 is a plan view of the work operator's seat, and Figures 7 to 9.
The figures show a modification of this invention; FIG. 7 is a side view of the operator's seat, FIG. 8 is a sectional view taken along the line - in FIG. 7, and FIG. 9 is a plan view of the operator's seat. 8...Work driver's seat, 11...Armrest arm,
12...Arm base, 13...Slide arm, 18, 21...Coil spring, 19...Support pin.

Claims (1)

[Scope of Claim for Utility Model Registration] In a work driving seat that has an armrest arm and allows the driver to grasp the work operation lever while resting his/her elbow on the armrest arm, the armrest arm slides onto the upper surface of the arm base. The arm is provided to be able to reciprocate back and forth, and has an elastic member that urges the slide arm to stop at a neutral position in the front and back direction, and the slide arm is moved forward against the elastic member. In this case, the tip of this slide arm can protrude further forward than the tip of the arm base, and the arm base or slide arm can be moved in the left-right direction, and the arm base or slide arm is stopped at a neutral position in the left-right direction. A working operator's seat for a hydraulic excavator, characterized in that it is provided with an elastic member that urges the user to do so.