JP2019023397A - Construction machine - Google Patents

Abstract

To reduce fatigue against operation of an operation lever by stably supporting an arm of an operator on an armrest surface of an armrest.SOLUTION: Armrests 20 and 33 are provided on rear sides of operation levers 14 and 18 and provided on console devices 12 and 16 and have armrest surfaces 20A and 33A on which an operator sitting on a seat 11 puts arms. On rear sides of the armrests 20 and 33, there are provided arm support members 22 and 34 rising upward from the armrest surfaces 20A and 33A. The arm support members 22 and 34 are configured to support the arms of the operator positioned on the armrest surfaces 20A and 33A from the rear when a front side of a cab 7 tilts upward by tilting upward while gripping the operation levers 14 and 18 of the console devices 12 and 16.SELECTED DRAWING: Figure 2

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 revolving frame.

  In general, a hydraulic excavator, which is a typical example of a construction machine, includes, for example, a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body via a swivel device, and a front side of the upper revolving body. And a front device provided so as to be movable up and down.

  The hydraulic excavator is also used for dismantling a high-rise building. This hydraulic excavator for dismantling work is provided with a dedicated front device, and this front device has a boom and an arm that are elongated, and cuts or grasps a reinforcing bar or the like 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 a console device having an operation lever operated by an operator seated on the seat is provided in the driver's seat device. Further, the console device is provided with an armrest having an arm resting surface on which an operator who sits on the seat and is placed on the seat is placed on the rear side of the operation lever.

  In the dismantling work hydraulic excavator, when dismantling the high-rise building, the boom and the arm are extended and the cutter is arranged at a high place. In this state, the operator who has boarded the cab operates the operating lever while driving the cutter or the like while observing the working place at a high place while sitting on the seat.

  Here, the excavator for dismantling work is designed so that the operator can visually check the high place while sitting on the seat. That is, in a hydraulic excavator for dismantling work, the cab is configured such that the front side tilts upward and downward on the revolving frame with the rear side as a fulcrum (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 seen. 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 a backward force acts on the arm placed on the arm rest surface of the armrest, there is a problem that fatigue due to the operation of the operation lever is increased.

  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 the operator's arm on the arm rest surface of the armrest, thereby reducing fatigue due to the operation of the operation lever. It is to provide a construction machine.

  The present invention provides a vehicle body frame, a cab which is provided on the vehicle body frame so as to tilt upward and downward with the rear side as a fulcrum to define a cab, and an operator provided in the cab. A driver's seat device having a seat to be seated, a console device provided in the driver's seat device that is located in the cab and operated by an operator seated on the seat, and a rear side of the operation lever. And an armrest having an armrest surface on which an operator seated on the seat is provided with the armrest, and the armrest rises upward from the armrest surface, When the front side of the cab tilts upward and tilts up with the operation lever of the console device held, the arm In the provision of the arm supporting member which supports the arms of the operator located on not a surface from the rear.

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

1 is a front view showing a hydraulic excavator according to a first embodiment of the present invention. It is a fragmentary sectional view of the principal part expansion which shows the front side part of an upper revolving body in the state which exposed the inside of a cab. It is a cross-sectional view which expands and shows the inside of a cab. It is a front view which shows a floor board, a driver's seat apparatus, a left console apparatus, a left armrest, and a left arm support member. It is the expanded sectional view which looked at the left armrest, the left arm support member, and the left space | interval adjustment mechanism from the arrow VV direction in FIG. It is a disassembled perspective view which shows a left armrest, a left arm support member, and a left space | interval adjustment mechanism. It is a front view which shows the some left arm support member by the 2nd Embodiment of this invention with the left armrest.

  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 type hydraulic excavator including a boom or an arm used for dismantling work of a high-rise building. In this multi-boom type hydraulic excavator, a cutter is disposed as a work tool at a high place by extending a boom or an arm upward. The operator operates the lever while viewing the cutter at a high place. For this reason, the hydraulic excavator of the multi-boom specification has a mechanism (cab tilt mechanism) that makes it easy to see a high place by tilting the cab upward with respect to the revolving frame.

  First, FIG. 1 thru | or FIG. 6 has shown the 1st Embodiment of this invention. In FIG. 1, a hydraulic excavator 1, which is a typical example of a construction machine, is mounted on a crawler-type lower traveling body 2 that can be self-propelled and turnable on the lower traveling body 2 and constitutes a vehicle body together with the lower traveling body 2. The upper swing body 3 and the front device 4 provided on the front side of the upper swing body 3 so as to be able to move up and down are configured.

  The front device 4 includes a lower boom 4A in which a foot portion on the base end side is attached to the front side of each vertical plate 5B constituting the revolving frame 5 so as to be able to move up and down, and an insert boom integrally attached to a distal end portion of the lower boom 4A. 4B, an upper boom 4C integrally attached to the distal end portion of the insert boom 4B, a middle arm 4D pivotally attached to the distal end portion of the upper boom 4C, and a pivotally attached to the distal end portion of the middle arm 4D Arm 4E, cutter 4F as a work 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 A first arm cylinder 4H provided between 4D and a second arm cylinder provided between middle arm 4D and arm 4E. And Sunda 4J, is configured to include a working tool cylinder 4K provided between the arm 4E and cutter 4F.

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

  Note that the cutter 4F can be replaced with another work 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 swing body 3 includes a swing 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 arm rest 20, a left arm support member 22, and a left distance adjusting mechanism 23. The right arm rest 33, the right arm support member 34, and the right interval adjusting mechanism 35 are included.

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

  Here, on the left front side of the swivel frame 5, a cab tilting device 6 is provided that supports a cab 7 described later so that the front side tilts upward and downward with the rear side as a fulcrum. The cab tilting device 6 includes a bed support (not shown) erected on the left front side of the revolving frame 5 and an L-shaped bed whose base end is rotatably attached to the upper part of the bed support. The support arm 6A, the cab bed 6B attached to the front end side of the bed support arm 6A, and the swivel frame 5 and the bed support arm 6A are provided, 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 in an anti-vibration state on the upper side.

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

  The driver seat device 8 is provided in the cab 7. The driver's seat device 8 is disposed 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 attached to the floor plate 7A, a seat adjustment mechanism 10 that is attached to the upper side of the mounting base 9 and adjusts the position of a seat 11 described later in the front, rear, up, and down directions. And a seat 11 attached to the upper side of the seat adjustment mechanism 10.

  The seat adjustment mechanism 10 includes a front / rear adjustment unit 10A attached on the mount 9 and a vertical adjustment unit 10B attached on the front / rear adjustment unit 10A. Console devices 12 and 16, which will be described later, are attached to the front / rear adjustment unit 10A. The seat 11 is seated by an operator 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 seat device 8. The left console device 12 includes a console body 13 attached to the front / rear adjustment portion 10 </ b> A 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 boarding / alighting side of the cab 7, and a gate lock lever 15 is provided on the front side of the console body 13.

  The console body 13 is attached to the front / rear adjustment portion 10A of the seat adjustment mechanism 10 via the attachment bracket 13A. The console main body 13 is provided extending in the front and rear directions on the left side of the seat 11. An operation lever 14 is provided at the front position of the console body 13, and a left armrest 20 described later is provided at the rear position.

  The operation lever 14 is provided at the front position of the console body 13. The operation lever 14 is operated by the left arm (left hand) of the operator seated 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 14 </ b> A is gripped by the left hand of the operator whose front end is seated on the seat 11.

  The gate lock lever 15 is provided on the front side of the left console device 12 so as to be rotatable upward and downward. The gate lock lever 15 can be prohibited from getting in and out of the cab 7 at the shut-off position (position shown in FIG. 4) that is tilted forward (pressed down). On the other hand, the gate lock lever 15 can permit entry into and exit from the cab 7 at the open position where the gate lock lever 15 is rotated upward from the blocking position and is raised (raised).

  As shown in FIG. 3, the right console device 16 is provided on the right side of the driver seat device 8. The right console device 16 includes a console main body 17 and an operation lever 18 that is positioned on the front side of the console main body 17 and is gripped by the right hand of the operator, in the same manner as the left console device 12. A right armrest 33 to be described later is provided at the rear position of the console body 17.

  The left and right travel lever pedals 19 are provided in front of the driver's seat device 8 (seat 11) and on the front 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 tilting forward and backward.

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

  The left armrest 20 is provided on the left console device 12 at the rear side of the operation lever 14. Specifically, the left armrest 20 is attached to a support body 21 that extends upward from the rear portion of the console main body 13 of the left console device 12. The left armrest 20 is used by an operator who sits on the seat 11 of the driver's seat device 8 to place the left arm.

  The left armrest 20 is made of, for example, a resin material. The left armrest 20 is formed of a prismatic body extending in the front and rear directions, and a rear position thereof is rotatably attached to an upper portion of the support body 21. When the left armrest 20 is tilted forward, as shown in FIG. 4, the left armrest 20 is fixed at a position substantially parallel to the floor plate 7A, and in this state, the operator seated on the seat 11 on the upper arm rest surface 20A The left arm of can be put on. That is, the left armrest 20 has an arm-mounting surface 20A that forms an upper flat surface, and a mounting hole 20B to which the support 21 is attached is provided at the lower position on the rear side so as to extend leftward and rightward. . Further, a lid 30 of a left interval adjusting mechanism 23 described later is attached to the rear surface 20C of the left armrest 20.

  In addition to the resin material, the left armrest 20 can also be formed of a metal material or a composite structure covered with a resin material using a metal material as a framework. A left arm support member 22 is attached to the rear side of the left armrest 20 via a left interval adjustment mechanism 23.

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

  Here, as shown in FIG. 4, the height dimension of the left arm support member 22 is a dimension that can reliably hold the left arm (left elbow) of the operator who tends to shift rearward due to the inclination when the cab 7 is tilted up. H is set. Further, since the length of the left arm of the operator varies from person to person, the left arm support member 22 is moved forward and backward by a left distance adjusting mechanism 23 so that the distance from the left elbow to the left hand that holds the operation lever 14 can be adjusted. The position can be adjusted in the backward direction.

  The left spacing adjustment mechanism 23 is provided on the rear side of the left armrest 20. The left distance adjusting mechanism 23 is the distance between the left arm support member 22 in the front and rear directions with respect to the operation lever 14 of the left console device 12, that is, the front end portion of the operation lever 14 and the support surface 22A of the left arm support member 22 shown in FIG. The distance dimension L is adjusted. The left interval 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 one of five positions.

  The left interval adjusting mechanism 23 includes a guide groove 24, positioning holes 25A to 25E, a moving piece 26, a fixed pin 27, a stopper 29, and a lid 30 which will be 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 rest surface 20A is narrow and the lower groove portion 24B away from the arm rest surface 20A is wide. The groove is formed to extend in the front-rear direction as a groove. Further, the rear end of the guide groove 24 is open to the rear surface 20 </ b> C 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 leftward and rightward. By arranging the five positioning holes 25A to 25E side by side in the front and rear directions, the distance L between the operation lever 14 and the left arm support member 22 can be adjusted in five stages. And the fixing pin 27 is penetrated by each positioning hole 25A-25E.

  The moving piece 26 is provided on the lower surface 22 </ b> B of the left arm support member 22. The moving piece 26 is inserted into the guide groove 24 so as to be movable in the forward and backward 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 pin insertion holes 26C that can communicate with the positioning holes 25A to 25E in the left and right directions. In the moving piece 26, the upper portion of the narrow portion 26 </ b> A is integrally fixed to the lower surface 22 </ b> B of the left arm support member 22.

  The fixed pin 27 is inserted into 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 that is larger than the width dimension of the left armrest 20, and a flange part 27 </ b> A for retaining is formed at the base end part with an increased diameter. For example, the fixed pin 27 is inserted into the pin insertion hole 26C and the positioning hole 25C in a state where the pin insertion hole 26C of the moving piece 26 is positioned in the positioning hole 25C located in the middle. In this insertion state, since the tip end portion of the fixing pin 27 protrudes from the pin insertion hole 26C, the fixing pin 27 can be held in the removal state by attaching the retaining pin 28 to the protruding end portion.

  Therefore, the moving piece 26, that is, the left arm support member 22 can be fixed to the position of the pin insertion hole 26 </ b> C serving as an intermediate portion in the front and rear adjustment ranges. Accordingly, the position of the left arm support member 22 is changed in five steps in the front and rear directions by changing the position for positioning the moving piece 26 and the position for inserting the fixing pin 27 to any one of the positioning holes 25A to 25E. Can be adjusted.

  The stopper 29 is positioned on the rear side of 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 30 is disposed 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 spaced leftward and rightward. Further, a stopper 29 is attached to the lid 30 by a single stopper mounting 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 interval 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 body 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 20 </ b> C of the left armrest 20 by the fixing bolts 31.

  When the left arm support member 22 is attached to the left armrest 20, the pin insertion hole 26C of the moving piece 26 is positioned in one of the positioning holes 25A to 25E, for example, the positioning hole 25C. In this state, the fixing pin 27 is inserted into the pin insertion hole 26 </ b> C and the positioning hole 25 </ b> C and is secured with the retaining pin 28. Thereby, the fixed position of the left arm support member 22 can be adjusted in the front and rear directions of the left arm rest 20.

  The right armrest 33 is disposed on the rear side of the operation lever 18 and is provided in the right console device 16. The right arm support member 34 is provided on the rear side of the right armrest 33 so as to rise upward from the arm rest surface 33A. The right interval adjustment mechanism 35 adjusts the distance between the tip of the operation lever 18 and the support surface 34 </ b> A of the right arm support member 34, and is provided on the rear side of the right armrest 33. Here, the right armrest 33 is configured in the same manner as the left armrest 20, the right arm support member 34 is configured in the same manner as the left arm support member 22, and the right interval adjustment mechanism 35 is configured in the same manner as the left interval adjustment mechanism 23. ing. For this reason, description of the right arm rest 33, the right arm support member 34, and the right space | interval adjustment mechanism 35 shall be abbreviate | omitted.

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

  When manipulating the excavator 1 for the first time, the operator opens the door 7 </ b> C and sits on the seat 11 in the cab 7. An operator seated on the seat 11 can drive the lower traveling body 2 by operating the left and right traveling levers / pedals 19.

  Next, when dismantling the high-rise building, the cab tilting device 6 tilts the cab 7 upward (tilt up) so that the high place can be visually observed in an easy 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 dismantle 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 and 16, and the left and right armrests 20 and 33 are also tilted together with the cab 7. In this case, a backward force is applied to the arms placed on the arm rest surfaces 20A and 33A of the armrests 20 and 33 due to the inclination accompanying the tilt-up. As a result, it is necessary to apply a force so that the arm does not shift to the rear side, so that fatigue due to the operation of the operation levers 14 and 18 increases.

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

  Therefore, the arm of the operator can be stably supported with respect to the arm mounting 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 rearward. As a result, the operability of the operation levers 14 and 18 can be improved, and 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 L between the distal ends 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 arm length, the operation levers 14 and 18 are operated. The nature will decline.

  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. Interval adjustment mechanisms 23 and 35 for adjusting the interval dimension L are provided. Therefore, the positions of the arm support members 22 and 34 can be appropriately adjusted according to the physique of the operator. Accordingly, the distance 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 feature of the present embodiment is that the arm support members are provided at a plurality of positions in the front and rear directions of the arm rest, and are stored in the arm rest surface and a support posture rising upward from the arm rest surface. In other words, it is possible to change the posture. In the second embodiment, the left armrest will be described, and the 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 so as to be located on the rear side of the operation lever 14, similarly to the left armrest 20 according to the first embodiment. The left armrest 41 is used by an operator who sits on the seat 11 of the driver's seat device 8 to place the left arm.

  The left armrest 41 is made of, for example, a prismatic body made of resin extending in the front and rear directions, and the left arm of the operator seated on the seat 11 is placed on the arm resting surface 41A on the upper surface side. A plurality of left arm support members 42 </ b> A to 42 </ b> C, which will be described later, are provided on the arm mounting surface 41 </ b> A of the left arm rest 41. In addition, the left armrest 41 can also be formed of a metal material or a composite structure covered with a resin material using a metal material as a framework other than the resin material.

  The left arm support members 42 </ b> A to 42 </ b> C are provided at a plurality of, for example, three locations in the front and rear directions of the left arm rest 41. Specifically, the left arm support member 42A, the left arm support member 42B, and the left arm support member 42C are arranged in the order of front and rear with a space therebetween. The left arm support members 42A to 42C are stowed upward from the retracted posture (the postures of the left arm support members 42A and 42B in FIG. 7) stored on the arm rest surface 41A of the left arm rest 41 and the arm rest surface 41A. The support posture (the posture of the left arm support member 42C in FIG. 7) can be changed.

  And each left arm support member 42A-42C is the state which hold | gripped the operation lever 14, and when the front part side of the cab 7 inclines upwards and tilts up, the operator's arm put on the arm rest surface 41A is seen from back. It is what is supported. Further, by selecting any one of the left arm support members 42A to 42C to be in the support posture, it is possible to correspond to the length of the operator's left arm.

  The left arm support members 42 </ b> A to 42 </ b> C all have the same configuration, and include a support plate housing portion 43, a support plate 44, and a holding leg 46, which will be described later.

  The support plate housing portion 43 is provided on the arm rest surface 41 </ b> A of the left armrest 41. The support plate accommodating portion 43 is formed as a concave groove that can accommodate the support plate 44 so that the support plate 44 is flush with the arm resting surface 41A in a retracted posture in which the support plate 44 is tilted forward. .

  The support plate 44 is formed as, for example, a rectangular plate having a width dimension equivalent to that of the left armrest 41. The base end portion of the support plate 44 is positioned 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 pivotable forward and backward via a connecting pin 45 extending leftward and rightward. ing. Like the left arm support member 42C in FIG. 7, the support plate 44 can take a support posture in which it rises upward from the arm resting surface 41A by rotating to the rear side about the connecting pin 45. it can. In this support posture of the support plate 44, the support plate 44 has a height dimension sufficient to prevent the operator's left arm from shifting to the rear side when the cab 7 is tilted up (projects upward from the arm rest surface 41A). Dimensions).

  The holding leg 46 is provided on the rear surface side of the support plate 44 in the upright support posture. The holding leg 46 is rotatably attached to the support plate 44. Thereby, the holding leg 46 can hold | maintain the support plate 44 in a support attitude | position by pressing a front-end | tip part on 41 A of arm rest surfaces, rotating in the support attitude | position of the support plate 44 back.

  The left arm support members 42 </ b> A to 42 </ b> C configured in this way are configured to raise the support plate 44 of the left arm support member 42 </ b> A located on the front side to a support posture, thereby moving the left arm support member 42 </ b> A forward and backward with respect to the operation lever 14. The interval can be adjusted to be short. On the other hand, by raising the support plate 44 of the left arm support member 42 </ b> C located on the rear side to a support posture, it is possible to adjust the distance between the front and rear directions of the left arm support member 42 </ b> A with respect to the operation lever 14 to be long.

  Thus, also in the second embodiment configured as described above, substantially the same operations and effects as those of the first embodiment described above can be obtained. In particular, in the second embodiment, the left arm support members 42A to 42C are provided at a plurality of locations in the front and rear directions of the left arm rest 41, and from the retracted posture stored in the arm rest surface 41A and the arm rest surface 41A. The posture can be changed to the support posture rising upward. Therefore, by setting the left arm support member at a position suitable for the length of the left arm of the operator to the support posture, the distance between the front and rear directions of the left arm support member 42A with respect to the operation lever 14 can be adjusted to an appropriate size. As a result, fatigue during lever operation can be reduced.

  In the first embodiment, the left arm support member 22 is provided in the front and rear by providing the left spacing adjustment mechanism 23 having five positioning holes 25A to 25E arranged in the front and rear directions on the left arm rest 20. The case where it is set as the structure which adjusts a position in five steps of directions is illustrated. However, the present invention is not limited to this, and for example, the position of the left arm support member 22 may be adjusted in 2 to 4 steps or 6 steps or more by the left interval adjusting mechanism 23. Further, as the left interval adjusting mechanism, a screw member extending in the front and rear directions is screwed to the moving piece, so that the position of the left arm support member can be adjusted steplessly in the front and rear directions by rotation of the screw member. .

  In 2nd Embodiment, the case where left arm supporting member 42A-42C is provided in three places of the front-back direction is illustrated. However, the present invention is not limited to this, and the left arm support member may be provided at two or four or more locations.

  Furthermore, in the first embodiment, the case where the left arm support members 22 and 34 are provided so that the positions of the left and right arm support members 22 and 34 can be adjusted forward and backward with respect to the armrests 20 and 33 is illustrated. However, the present invention is not limited to this, and the arm support member may be fixedly provided on the rear side of the armrest.

1 Excavator (construction machine)
5 Turning 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-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)
L Distance between the front and rear arm support members for the console lever

Claims (3)

A vehicle body frame, a cab that is provided on the vehicle body frame so as to tilt upward and downward with the rear side as a fulcrum, and that defines a cab; and a seat that is provided in the cab and on which an operator sits. A driver seat device having a console device having an operation lever located in the cab and provided in the driver seat device and operated by an operator seated on the seat; and a console device located behind the operation lever In a construction machine configured to include an armrest having an armrest surface on which an operator sitting on the seat and on which the arm is mounted is provided in the apparatus,
The armrest rises upward from the arm rest surface and is positioned on the arm rest surface when the front side of the cab tilts upward and tilts up with the operation lever of the console device being gripped. A construction machine comprising an arm support member for supporting an operator's arm from behind.   The construction machine according to claim 1, wherein the armrest is provided with an interval adjustment mechanism that adjusts an interval in the front and rear directions of the arm support member with respect to the operation lever of the console device.   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 retracted posture stored on the arm rest surface and a support posture rising upward from the arm rest surface. The construction machine according to claim 1, wherein the construction machine is configured to be possible.

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