JP6722152B2 - Construction machinery - Google Patents

Description

The present invention relates to a construction machine such as a hydraulic excavator, and more particularly to a construction machine in which a cab can be tilted upward and downward with respect to a swing frame.

Generally, a hydraulic excavator, which is a typical example of construction machinery, includes, for example, a self-propelled undercarriage, an upper revolving structure mounted on the lower traveling structure through a revolving device so as to be revolvable, and a front side of the upper revolving structure. The front device is provided so as to be able to move upward and downward.

The hydraulic excavator is also used for demolition work of high-rise buildings. This hydraulic excavator for dismantling work is provided with a dedicated front device, and in this front device, a boom and an arm are formed in a long length, and a rebar or the like is cut or grasped at the tip of the arm. A cutter is installed as a work tool.

A driver's seat device having a seat on which an operator is seated is provided in the cab, and the driver's seat device is provided with a console device having an operation lever operated by an operator seated on the seat. Further, the console device is provided with an armrest that is located on the rear side of the operation lever and has an armrest surface on which an operator sitting on a seat can rest his or her arm.

For the hydraulic excavator for dismantling work, when performing the dismantling work of a high-rise building, the boom and arm are extended and the cutter is placed at a high place. In this state, the operator, who is seated in the cab, drives the cutter and the like by operating the operating lever while seated on the seat while visually observing a work place at a high place.

Here, the hydraulic excavator for dismantling work allows an operator to naturally see a high place while sitting on a seat. That is, in the hydraulic excavator for dismantling work, the cab is configured such that the front side tilts upward and downward with the rear side as a fulcrum on the revolving frame (see, for example, Patent Document 1).

JP, 2017-44041, A

In Patent Document 1, the front side of the cab is tilted up so that a high place can be easily viewed. However, when the cab is tilted up, the driver's seat device, the console device and the armrest are also tilted together with the cab. In this case, since the backward force is applied to the arm resting on the arm resting surface of the armrest due to the inclination, there is a problem that fatigue to the operation of the operation lever increases.

The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to stably support an arm of an operator on an arm resting surface of an armrest, thereby reducing fatigue caused by operating an operating lever. The purpose is to provide the construction machine.

The present invention is directed to a vehicle body frame, a cab provided on the vehicle body frame so that a front side tilts upward and downward with a rear side serving as a fulcrum to define a driver's cab, and an operator provided in the cab for operating a cab. A driver's seat device having a seat to be seated, a console device having an operation lever located in the cab and operated by an operator seated in the driver's seat device, and a console device located behind the operation lever. Then, in the construction machine configured to include an arm rest having an arm resting surface on which an operator seated on the seat provided on the console device rests, the armrest rises upward from the arm resting surface, When the front side of the cab is tilted upward and tilted up while holding the operation lever of the console device, an arm supporting member that supports the arm of the operator located on the arm resting surface from the rear is provided , the armrest, the front of the arm supporting member relative to the operating lever of the console device, that have distance adjusting mechanism for adjusting the spacing of the rear direction is provided.
Further, according to the present invention, a vehicle body frame, a cab that is provided on the vehicle body frame such that a front side tilts upward and downward with a rear side as a fulcrum to define a driver's cab, and a cab provided inside the cab A driver's seat device having a seat on which an operator is seated, a console device having an operating lever located in the cab and provided in the driver's seat device and operated by an operator seated on the seat, and a rear side of the operating lever In the construction machine configured to include an armrest having an armresting surface on which an operator seated on the seat is provided, the armrest being located on the console device, and the armrest being upward from the armresting surface. Standing up, when the front side of the cab tilts upward and tilts up while holding the operation lever of the console device, an arm support member that supports the operator's arm located on the armrest surface from the rear is provided. The arm support member is provided at a plurality of positions in the front and rear directions of the armrest, and has a storage posture that is stored in the arm resting surface and a support posture that rises upward from the arm resting surface. It is configured to be changeable.

According to the present invention, the operator's arm can be stably supported on the armrest surface of the armrest, and fatigue due to the operation of the operation lever can be reduced.

It is a front view showing a hydraulic excavator concerning a 1st embodiment of the present invention. FIG. 6 is a partial cross-sectional view showing an enlarged main part of a front portion of the upper swing body in a state where the inside of the cab is exposed. It is a cross-sectional view which expands and shows the inside of a cab. It is a front view showing a floor board, a driver's seat device, a left console device, a left armrest, and a left arm support member. FIG. 5 is an enlarged cross-sectional view of the left armrest, the left arm support member, and the left gap adjusting mechanism as viewed in the direction of the arrow VV in FIG. It is an exploded perspective view showing a left armrest, a left arm support member, and a left gap adjusting mechanism. FIG. 9 is a front view showing a plurality of left arm supporting members according to a second embodiment of the present invention together with a left arm rest.

Hereinafter, as a typical example of a construction machine according to an embodiment of the present invention, a crawler type hydraulic excavator will be described as an example, and will be described in detail with reference to the accompanying drawings.

The hydraulic excavator according to the present embodiment is configured as, for example, a multi-boom hydraulic excavator including a boom or an arm used for dismantling work of a high-rise building. In this multi-boom hydraulic excavator, the cutter is arranged as a work tool at a high place by extending the boom and arm upward. The operator operates the lever while observing the cutter at a high place. For this reason, the multi-boom type hydraulic excavator has a mechanism (cab tilt mechanism) for tilting the cab upward with respect to the revolving frame so as to make it easier to visually check a high place.

First, FIGS. 1 to 6 show a first embodiment of the present invention. In FIG. 1, a hydraulic excavator 1 that is a typical example of a construction machine is a crawler-type lower traveling body 2 that is self-propelled, and is rotatably mounted on the lower traveling body 2, and constitutes a vehicle body together with the lower traveling body 2. The upper revolving superstructure 3 and a front device 4 provided on the front side of the upper revolving superstructure 3 so as to be able to move up and down.

The front device 4 includes a lower boom 4A having a foot portion on the base end side attached to the front side of each of the vertical plates 5B constituting the revolving frame 5 so as to be able to move upward and downward, and an insert boom integrally attached to the tip end portion of the lower boom 4A. 4B, upper boom 4C integrally attached to the tip of insert boom 4B, middle arm 4D rotatably attached to the tip of upper boom 4C, and rotatably attached to the tip of middle arm 4D. Arm 4E, cutter 4F as a working tool rotatably attached to the tip of arm 4E, boom cylinder 4G provided between revolving frame 5 and lower boom 4A, upper boom 4C and middle arm. 4D, a first arm cylinder 4H, a second arm cylinder 4J provided between the middle arm 4D and the arm 4E, and a work tool cylinder provided between the arm 4E and the cutter 4F. 4K is included.

Here, the boom cylinder 4G, the second arm cylinder 4J, and the work implement cylinder 4K of the front device 4 are operated by the operation lever 14 of the left console device 12 and the operation lever 18 of the right console device 16 described later. On the other hand, the first arm cylinder 4H is operated by a pedal or a lever (switch) provided inside the cab 7.

The cutter 4F can be replaced with another working tool such as a grapple. Further, the front device 4 can shorten the front length by removing the insert boom 4B. On the other hand, the front length can be increased by adding the insert boom 4B.

The upper revolving structure 3 includes a revolving frame 5, a cab tilting device 6, a cab 7, a driver's seat device 8, a left console device 12, a right console device 16, a left armrest 20, a left arm supporting member 22, and a left gap adjusting mechanism 23, which will be described later. , A right armrest 33, a right arm support member 34, and a right space adjustment mechanism 35.

The swivel frame 5 constitutes a vehicle body frame and is formed as a strong support structure. As shown in FIG. 1 and FIG. 2, the swivel frame 5 is provided with a flat and thick bottom plate 5A extending in the front and rear directions, and is erected on the bottom plate 5A at intervals in the left and right directions, and extends in the front and rear directions. A left vertical plate 5B and a right vertical plate (not shown) that extend, and a plurality of overhanging beams that extend outward from the bottom plate 5A and each vertical plate 5B in the left and right directions, and are arranged in the front and rear directions (see FIG. (Not shown), and a left side frame 5C and a right side frame (not shown) that are attached to the tip of each overhang beam and extend in the front and rear directions. On the front side of the left and right vertical plates 5B, a foot portion of a lower boom 4A that constitutes the front device 4 is rotatably attached.

Here, on the left front side of the revolving frame 5, there is provided a cab tilting device 6 which supports a cab 7 described later such that the front side tilts upward and downward with a rear side as a fulcrum. The cab tilting device 6 includes a bed support (not shown) provided upright on the left front side of the revolving frame 5, and an L-shaped bed having a base end side rotatably attached to an upper part of the bed support. It is provided between the support arm 6A, the cab bed 6B attached to the tip end side of the bed support arm 6A, the revolving frame 5 and the bed support arm 6A, and the cab bed 6B is moved up and down via the bed support arm 6A. And a tilting cylinder (not shown) that tilts in the direction. The cab bed 6B is formed as a rectangular frame that is long in the front and rear directions, and the cab 7 is attached to the upper side of the cab in a vibration-proof state.

The cab 7 is attached to the upper side of the cab bed 6B in a vibration-proof state. The cab 7 defines a driver's cab inside. As shown in FIGS. 2 and 3, the cab 7 includes, for example, a floor plate 7A made of a rectangular plate body that is long in the front and rear directions, and a cab box 7B that stands up from the periphery of the floor plate 7A and is closed at the upper side. It is composed of and. A door 7C (see FIG. 1) that is opened and closed when getting on and off the cab 7 is provided on the left side surface of the cab box 7B.

The driver's seat device 8 is provided in the cab 7. The driver's seat device 8 is arranged at or near the center position of the floor plate 7A of the cab 7. The driver's seat device 8 includes a mounting base 9 mounted on the floor plate 7A, and a seat adjusting mechanism 10 mounted on the upper side of the mounting base 9 for adjusting the position of a seat 11, which will be described later, in the front, rear, up, and down directions. , And a seat 11 mounted on the upper side of the seat adjusting mechanism 10.

The seat adjusting mechanism 10 includes a front-rear adjusting unit 10A mounted on the mount 9, and a vertical adjusting unit 10B mounted on the front-rear adjusting unit 10A. Console devices 12 and 16 described later are attached to the front-rear adjustment unit 10A. The seat 11 is for an operator to sit on and has a seat portion 11A and a backrest portion 11B.

The left console device 12 is provided on the left side of the driver's seat device 8. The left console device 12 includes a console body 13 attached to the front-rear adjustment unit 10A of the seat adjustment mechanism 10 and an operation lever 14 provided on the front side of the console body 13. The left console device 12 is located on the entry/exit side of the cab 7, and is provided on the front side of the console body 13 with a gate lock lever 15.

The console body 13 is attached to the front-rear adjustment unit 10A of the seat adjustment mechanism 10 via a mounting bracket 13A. The console body 13 is provided so as to extend in the front and rear directions at the left side position of the seat 11. An operation lever 14 is provided at a front side position of the console body 13, and a left armrest 20 described later is provided at a rear side position thereof.

The operation lever 14 is provided at the front side position of the console body 13. The operation lever 14 is operated by the left arm (left hand) of the operator sitting on the seat 11. The operation lever 14 includes a pressure reducing valve type hydraulic pilot valve (not shown) attached to the console body 13 and a lever 14A for tilting the hydraulic pilot valve. The lever 14A is gripped by the left hand of the operator who has seated on the seat 11 at its tip.

The gate lock lever 15 is provided on the front side of the left console device 12 so as to be pivotable upward and downward. The gate lock lever 15 can prohibit entry/exit to/from the cab 7 at a shut-off position (position in FIG. 4) that is tilted (pushed down) to the front side. On the other hand, the gate lock lever 15 can allow the passenger to get on and off the cab 7 at the opened position where the gate lock lever 15 is rotated upward from the cut-off position to be raised (raised).

As shown in FIG. 3, the right console device 16 is provided on the right side of the driver's seat device 8. Similar to the left console device 12, the right console device 16 is configured to include a console body 17 and an operation lever 18 that is located on the front side of the console body 17 and that is gripped by the operator's right hand. A right armrest 33, which will be described later, is provided at the rear position of the console body 17.

The left and right traveling levers/pedals 19 are located in front of the driver's seat device 8 (seat 11) and provided on the front side portion of the floor plate 7A of the cab 7. Each traveling lever/pedal 19 controls the traveling operation of the lower traveling body 2 by performing a tilting operation in the front and rear directions.

Next, the configurations of the left and right armrests 20 and 33 and the left and right arm support members 22 and 34, which are characteristic parts of the present invention, will be described.

The left armrest 20 is located on the rear side of the operation lever 14 and is provided on the left console device 12. Specifically, the left armrest 20 is attached to a support body 21 that extends upward from the rear part of the console body 13 of the left console device 12. The left armrest 20 is for the operator sitting on the seat 11 of the driver's seat device 8 to put on his left arm.

The left armrest 20 is made of, for example, a resin material. The left armrest 20 is composed of a prismatic body extending in the front and rear directions, and its rear position is rotatably attached to the upper portion of the support body 21. When the left armrest 20 is tilted forward, the left armrest 20 is fixed in a position substantially parallel to the floorboard 7A as shown in FIG. 4, and in this state, the operator who sits on the seat 11 on the upper armrest surface 20A. Can rest his left arm. That is, the left armrest 20 has an upper arm-mounting surface 20A that is a flat surface, and a mounting hole 20B to which the support 21 is mounted is provided in the lower portion on the rear side so as to extend in the left and right directions. .. Further, a lid 30 of a left gap adjusting mechanism 23, which will be described later, is attached to the rear surface 20C of the left armrest 20.

The left armrest 20 may be formed of a metal material or a composite structure covered with a resin material using a metal material as a skeleton, instead of the resin material. A left arm support member 22 is attached to the rear side of the left armrest 20 via a left gap adjusting mechanism 23.

As shown in FIG. 5, the left arm support member 22 is provided on the rear side of the left arm rest 20 so as to rise upward from the arm resting surface 20A. The left arm support member 22 is made of, for example, a resin material and is formed as a rectangular parallelepiped block body having a width dimension equivalent to that of the left arm rest 20. The front surface of the left arm support member 22 serves as a support surface 22A that prevents the left arm of the operator from shifting rearward. The lower surface 22B of the left arm support member 22 is in contact with the arm resting surface 20A of the left armrest 20, and the moving piece 26 of the left gap adjusting mechanism 23 is attached thereto.

Here, as shown in FIG. 4, the height dimension of the left arm support member 22 is such that the left arm (left elbow) of the operator who tends to shift to the rear side due to the tilt when the cab 7 is tilted up can be reliably held. It is set to H. Since the length of the operator's left arm varies from person to person, the left arm support member 22 is moved forward by the left distance adjusting mechanism 23 so that the distance dimension from the left elbow to the left hand holding the operation lever 14 can be adjusted. The position can be adjusted rearward.

The left gap adjusting mechanism 23 is provided on the rear side of the left armrest 20. The left gap adjusting mechanism 23 is a gap between the left arm supporting member 22 and the left arm supporting member 22 in the front and rear directions with respect to the operating lever 14 of the left console device 12, that is, the front end portion of the operating lever 14 and the supporting surface 22A of the left arm supporting member 22 shown in FIG. The distance dimension L of is adjusted. The left gap adjusting mechanism 23 fixes the left arm support member 22 at a plurality of positions in the front and rear directions, for example, at any of five positions.

The left gap adjusting mechanism 23 is configured to include a guide groove 24, positioning holes 25A to 25E, a moving piece 26, a fixing pin 27, a stopper 29, and a lid body 30 described later.

The guide groove 24 is provided on the upper rear side of the left armrest 20. As shown in FIG. 6, the guide groove 24 has an inverted T-shaped step in which the upper groove portion 24A opened to the arm resting surface 20A has a narrow width and the lower groove portion 24B apart from the arm resting surface 20A has a wide width. The groove is formed so as to extend in the front-rear direction. Further, the rear end of the guide groove 24 is open to the rear surface 20C of the left armrest 20.

On the upper rear side of the left armrest 20, a plurality of, for example, five positioning holes 25A to 25E are provided so as to penetrate the lower groove portion 24B of the guide groove 24 in the left and right directions. By arranging the five positioning holes 25A to 25E side by side in the front and rear directions, the distance dimension L between the operation lever 14 and the left arm support member 22 described above can be adjusted in five steps. Then, the fixing pin 27 is inserted into each of the positioning holes 25A to 25E.

The moving piece 26 is provided on the lower surface 22B of the left arm support member 22. The movable piece 26 is inserted in the guide groove 24 so as to be movable in the front and rear directions, and is formed as an inverted T-shaped block slightly smaller than the guide groove 24. That is, the moving piece 26 has a narrow portion 26A on the upper side and a wide portion 26B on the lower side. The wide portion 26B is provided with a pin insertion hole 26C which can communicate with each of the positioning holes 25A to 25E and which penetrates in the left and right directions. The upper portion of the narrow portion 26A of the moving piece 26 is integrally fixed to the lower surface 22B of the left arm support member 22.

The fixed pin 27 is inserted through any one of the positioning holes 25A to 25E and the pin insertion hole 26C of the moving piece 26. The fixing pin 27 has a length dimension larger than the width dimension of the left armrest 20, and a flange portion 27A for preventing slip-out is formed at its base end portion so as to have an enlarged diameter. The fixed pin 27 is inserted into the pin insertion hole 26C and the positioning hole 25C, for example, with the pin insertion hole 26C of the moving piece 26 positioned in the intermediate positioning hole 25C. In this inserted state, the tip end of the fixing pin 27 projects from the pin insertion hole 26C, so that by attaching the retaining pin 28 to the protruding end, the fixing pin 27 can be retained in the retaining state.

Therefore, the movable piece 26, that is, the left arm support member 22 can be fixed to the position of the pin insertion hole 26C which is the intermediate portion in the adjustment range in the front and rear directions. Accordingly, by changing the position for aligning the moving piece 26 and the position for inserting the fixing pin 27 to any one of the positioning holes 25A to 25E, the position of the left arm support member 22 can be moved forward or backward in five steps. Can be adjusted with.

The stopper 29 is located behind the moving piece 26 and is inserted into the guide groove 24. When the moving piece 26 is moved to the rear side, the stopper 29 comes into contact with the moving piece 26 at the movement limit position to limit the movement.

The lid body 30 is arranged on the rear surface 20C of the left armrest 20 so as to close the rear end of the guide groove 24, and is attached to the rear surface 20C by two fixing bolts 31 which are separated in the left and right directions. Further, the stopper 29 is attached to the lid body 30 by one stopper attachment bolt 32 at the center.

Next, an example of a procedure for adjusting the position of the left arm support member 22 in the front and rear directions by the left gap adjusting mechanism 23 will be described.

The moving piece 26 attached to the left arm support member 22 is inserted into the guide groove 24 from the rear side. The stopper 29 is attached to the lid 30 with the stopper mounting bolt 32. In this state, the stopper 29 is inserted into the guide groove 24, and the lid 30 is fixed to the rear surface 20C of the left armrest 20 by each fixing bolt 31.

When the left arm support member 22 is attached to the left arm rest 20, the pin insertion hole 26C of the moving piece 26 is positioned in any of the positioning holes 25A to 25E, for example, the positioning hole 25C. In this state, the fixed pin 27 is inserted into the pin insertion hole 26C and the positioning hole 25C, and the retaining pin 28 prevents the retaining pin 27 from coming off. Thereby, the fixed position of the left arm support member 22 can be adjusted in the front and rear directions of the left armrest 20.

The right armrest 33 is located on the rear side of the operation lever 18 and is provided on the right console device 16. The right arm support member 34 is provided on the rear side of the right arm rest 33 so as to rise upward from the arm resting surface 33A. The right gap adjusting mechanism 35 adjusts the distance between the tip of the operating lever 18 and the support surface 34A of the right arm supporting member 34, and is provided on the rear side of the right armrest 33. Here, the right armrest 33 is configured similarly to the left armrest 20, the right arm support member 34 is configured similar to the left arm support member 22, and the right distance adjustment mechanism 35 is configured similar to the left distance adjustment mechanism 23. ing. Therefore, the description of the right armrest 33, the right arm support member 34, and the right gap adjusting mechanism 35 will be omitted.

The hydraulic excavator 1 according to the present embodiment has the above-mentioned configuration. Next, the operation of the hydraulic excavator 1 will be described.

When operating the hydraulic excavator 1 for the first time, the operator opens the door 7C and sits on the seat 11 in the cab 7. An operator seated on the seat 11 can operate the lower traveling body 2 by operating the left and right traveling lever pedals 19.

Next, when disassembling a high-rise building, the cab tilting device 6 tilts the cab 7 upward (tilt up) so that the user can visually check the height in a comfortable posture. In this state, by operating the operation levers 14 and 18 of the left and right console devices 12 and 16, the front device 4 can be operated to perform the demolition work of the high-rise building.

Here, when the front side of the cab 7 is tilted up, the driver's seat device 8, the left and right console devices 12, 16 and the left and right armrests 20, 33 are also tilted together with the cab 7. In this case, a backward force is applied to the arms resting on the arm resting surfaces 20A and 33A of the armrests 20 and 33 due to the tilt accompanying the tilt-up. As a result, since it is necessary to apply force so that the arm does not shift to the rear side, fatigue with respect to the operation of the operation levers 14 and 18 increases.

However, according to the first embodiment, the arm support members 22 and 34 that rise upward from the arm resting surfaces 20A and 33A are provided on the rear side of the armrests 20 and 33. The arm support members 22 and 34 are on the armrest surfaces 20A and 33A when the front side of the cab 7 tilts upward and tilts up while holding the operation levers 14 and 18 of the console devices 12 and 16. The operator's arm located at can be supported from behind.

Therefore, the arm of the operator can be stably supported on the arm resting surfaces 20A and 33A of the armrests 20 and 33. This eliminates the need for the operator to apply force so that the arm does not shift to the rear side. As a result, the operability of the operation levers 14 and 18 can be improved, and the fatigue when the operation levers 14 and 18 are operated can be reduced.

Here, the length dimension of the arm, specifically, the length dimension from the elbow to the hand varies depending on the operator. For this reason, when the distance dimension L between the tip end portions of the operation levers 14 and 18 and the support surfaces 22A and 34A of the arm support members 22 and 34 is not suitable for the length of the arm, operation of the operation levers 14 and 18 is performed. Sex is reduced.

On the other hand, in the first embodiment, the left and right armrests 20 and 33 have front and rear directions of the arm support members 22 and 34 with respect to the operation levers 14 and 18 of the left and right console devices 12 and 16, respectively. Interval adjustment mechanisms 23 and 35 for adjusting the interval dimension L are provided. Therefore, the positions of the arm supporting members 22 and 34 can be appropriately adjusted according to the physique of the operator. Thereby, the distance dimension L between the operation levers 14 and 18 and the arm support members 22 and 34 can be adjusted to an optimum value, and the operability of the operation levers 14 and 18 can be improved.

Next, FIG. 7 shows a second embodiment of the present invention. The features of the present embodiment are that the arm support members are provided at a plurality of positions in the front and rear directions of the armrest, and are stored in the arm resting surface and stored in the arm resting surface. This is because the posture can be changed. In the second embodiment, the left armrest will be described, and description of the right armrest having the same configuration will be omitted. Furthermore, the configuration used in the first embodiment is applied to the configuration other than the left armrest.

In FIG. 7, the left armrest 41 according to the second embodiment is provided on the left console device 12 at the rear side of the operation lever 14 like the left armrest 20 according to the first embodiment. The left armrest 41 is for the operator sitting on the seat 11 of the driver's seat device 8 to put on his left arm.

The left armrest 41 is, for example, a resin prismatic body extending in the front and rear directions, and the operator's left arm seated on the seat 11 is placed on the upper arm rest surface 41A. The arm resting surface 41A of the left armrest 41 is provided with a plurality of left arm support members 42A to 42C described later. The left armrest 41 may be formed of a metal material or a composite structure covered with a resin material using a metal material as a skeleton, instead of the resin material.

The left arm support members 42A to 42C are provided at a plurality of front and rear positions of the left armrest 41, for example, at three positions. Specifically, the left arm support member 42A, the left arm support member 42B, and the left arm support member 42C are arranged in this order at intervals in the front and rear directions. The left arm support members 42A to 42C are stored in the arm rest surface 41A of the left armrest 41 (the postures of the left arm support members 42A and 42B in FIG. 7) and rise upward from the arm rest surface 41A. The posture can be changed to a different support posture (the posture of the left arm support member 42C in FIG. 7).

Then, when the front side of the cab 7 tilts upward and tilts up while holding the operation lever 14, the left arm supporting members 42A to 42C move the operator's arm placed on the arm resting surface 41A from the rear side. It supports. Further, by selecting any one of the left arm supporting members 42A to 42C and setting it in the supporting posture, it is possible to cope with the length of the left arm of the operator.

Each of the left arm support members 42A to 42C has the same configuration, and is configured to include a support plate accommodating portion 43, a support plate 44, and a holding leg 46 described later.

The support plate accommodating portion 43 is provided on the arm resting surface 41A of the left armrest 41. The support plate accommodating portion 43 is formed as a recessed groove capable of accommodating the support plate 44 so that the support plate 44 is flush with the arm rest surface 41A in the retracted posture in which the support plate 44 is tilted forward. ..

The support plate 44 is formed as, for example, a rectangular plate body having a width dimension equivalent to that of the left armrest 41. The base end portion of the support plate 44 is located at the rear portion of the support plate housing portion 43 and is attached to the upper portion of the left armrest 41 so as to be rotatable in the front and rear directions via a connecting pin 45 extending in the left and right directions. ing. Like the left arm support member 42C in FIG. 7, the support plate 44 can take a supporting posture in which it rises upward from the arm rest surface 41A by rotating rearward about the connecting pin 45. it can. In the support posture of the support plate 44, the support plate 44 has a height dimension (protruding upward from the armrest surface 41A) sufficient to prevent the left arm of the operator from shifting rearward when the cab 7 is tilted up. Have the same dimensions).

The holding leg 46 is provided on the rear surface side of the support plate 44 in a standing support posture. The holding leg 46 is rotatably attached to the support plate 44. Accordingly, the holding leg 46 can hold the support plate 44 in the supporting posture by rotating the rear side in the supporting posture of the supporting plate 44 and pressing the tip end against the armrest surface 41A.

The left arm support members 42A to 42C configured in this manner raise the support plate 44 of the left arm support member 42A located on the front side to be in the support posture, so that the left arm support member 42A with respect to the operation lever 14 moves forward and backward. The interval can be adjusted shorter. On the other hand, by raising the support plate 44 of the left arm supporting member 42C located on the rear side to be in the supporting posture, it is possible to adjust the distance between the left arm supporting member 42A and the operating lever 14 in the front and rear directions to be long.

Thus, also in the second embodiment configured in this way, it is possible to obtain substantially the same actions and effects as those of the first embodiment described above. In particular, in the second embodiment, the left arm support members 42A to 42C are provided at a plurality of positions in the front and rear directions of the left armrest 41, and are stored in the arm rest surface 41A from the storage posture and the arm rest surface 41A. The posture can be changed to a supporting posture that rises upward. Therefore, by setting the left arm supporting member at a position suitable for the length of the operator's left arm to the supporting posture, the distance between the left arm supporting member 42A and the operation lever 14 in the front and rear directions can be adjusted to an appropriate dimension. As a result, fatigue when operating the lever can be reduced.

In the first embodiment, the left arm support member 22 is provided with the front and rear parts by providing the left armrest 20 with the left gap adjusting mechanism 23 having five positioning holes 25A to 25E arranged in the front and rear directions. An example is shown in which the position is adjusted in five stages. However, the present invention is not limited to this, and for example, the left gap adjustment mechanism 23 may be configured to adjust the position of the left arm support member 22 in 2 to 4 steps or 6 or more steps. Further, as the left gap adjusting mechanism, a configuration may be adopted in which the left arm supporting member is positionally adjusted forward and backward by rotating the screw member by screwing a screw member extending forward and backward to the moving piece. ..

The second embodiment exemplifies a case where the left arm support members 42A to 42C are provided at three positions in the front-rear direction. However, the present invention is not limited to this, and the left arm support member may be provided at two locations or four or more locations.

Further, the first embodiment exemplifies a case in which the left arm support members 22 and 34 are provided to the armrests 20 and 33 so that the positions thereof can be adjusted in the front and rear directions. However, the present invention is not limited to this, and the arm supporting member may be fixedly provided on the rear side of the armrest.

1 Hydraulic excavator (construction machinery)
5 Swivel frame (body frame)
7 cab 8 driver's seat device 11 seat 12 left console device (console device)
14, 18 Operation lever 16 Right console device (console device)
20,41 Left armrest (armrest)
20A, 33A, 41A Arm resting surface 22, 42A to 42C Left arm support member (arm support member)
23 Left spacing adjustment mechanism (spacing adjustment mechanism)
33 Right armrest (armrest)
34 Right arm support member (arm support member)
35 Right spacing adjustment mechanism (spacing adjustment mechanism)
Distance between the front and rear of the arm support member with respect to the operation lever of the L console device

Claims (2)

A vehicle body frame, a cab that is provided on the vehicle body frame so that a front side tilts upward and downward with a rear side as a fulcrum to define a driver's cab; and a seat provided in the cab on which an operator sits. A driver's seat device having the same, a console device provided in the cab and having an operation lever operated by an operator seated in the seat, and a console located behind the operation lever. A construction machine configured to include an armrest having an armrest surface on which an operator seated on the seat is provided, which is provided in the device,
The armrest is positioned above the armrest surface when rising upward from the armrest surface and tilting up by tilting the front side of the cab upward while holding the operation lever of the console device. Provide an arm support member that supports the operator's arm from the rear ,
A construction machine , wherein the armrest is provided with a space adjusting mechanism for adjusting a space between the arm support member and the operation lever of the console device in the front and rear directions . A vehicle body frame, a cab that is provided on the vehicle body frame so that a front side tilts upward and downward with a rear side as a fulcrum to define a driver's cab; and a seat provided in the cab on which an operator sits. A driver's seat device having the same, a console device provided in the cab and having an operation lever operated by an operator seated in the seat, and a console located behind the operation lever. A construction machine configured to include an armrest having an armrest surface on which an operator seated on the seat is provided, which is provided in the device,
The armrest is positioned above the armrest surface when rising upward from the armrest surface and tilting up by tilting the front side of the cab upward while holding the operation lever of the console device. Provide an arm support member that supports the operator's arm from the rear,
The arm support members are provided at a plurality of positions in the front and rear directions of the armrest, and the posture changes between a storage posture stored in the arm resting surface and a support posture standing upward from the arm resting surface. capable construction machinery characterized by being composed.

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