Construction machine

Abstract

The left control console device (13) located on the passenger / passage passage (9A) side has: a support shaft (15) disposed on the seat base (11); and a rotating frame (17) rotatably supported on the support shaft (15). The door lock bar (25) has: a base plate (25A) rotatably supported on the rotating frame (17) via a first shaft (17D) and provided with a second shaft (25D); and a bar member (25B) having a gripping portion (25E) integrally disposed on the base plate (25A). A guide plate (26) is rotatably mounted on the seat base (11). When the rotating frame (17) and the door lock bar (25) rotate together about the support shaft (15), the guide groove (27) provided on the guide plate (26) restricts the movement of the second shaft (25D) and suppresses the change in the height position of the gripping portion (25E) of the bar member (25B).

Description

Technical Field

[0001] This invention relates to engineering machinery such as hydraulic excavators, which have control consoles on both sides of the driver's seat. Background Technology

[0002] A hydraulic excavator, representing construction machinery, features: a self-propelled body consisting of a lower traveling body and an upper slewing body; and a working device located at the front of the upper slewing body. A cab is located on the front left side of the upper slewing body. The cab contains a driver's seat, with control consoles equipped with levers on either side. The operator sits in the driver's seat through a passageway on the floor via a loading and unloading opening on the left side of the cab and operates the left and right levers. Operation of these levers controls the actuators that perform the rotation of the upper slewing body and the movement of the working device.

[0003] A door lock lever is provided on the left control panel, which serves as the passenger / passenger passage. This door lock lever controls the supply of pilot pressure to the operating lever, shifting between a locked position that prohibits actuator operation regardless of the operating lever's operation and a unlocked position that allows actuator operation corresponding to the operating lever's operation. The door lock lever opens the passenger / passenger passage when in the locked position and closes it when in the unlocked position. Therefore, even if the operator accidentally touches the operating lever while passing through the open passenger / passenger passage, accidental actuator operation is prevented.

[0004] However, in a known hydraulic excavator, since operators of various sizes sit in the driver's seat, the height of the control levers can be adjusted relative to the driver's seat by changing the height of the control console on which the control levers are mounted, so that these operators can operate the control levers in a comfortable posture (Patent Document 1). Furthermore, in a known hydraulic excavator, a control console located on the passenger access side can be moved in the direction of widening the passenger access (rearward) to allow larger operators to smoothly pass from the passenger access opening in the cab to the passenger access passage in the driver's seat (Patent Document 2).

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2018-168566

[0008] Patent Document 2: Japanese Patent Application Publication No. 2012-127137 Summary of the Invention

[0009] However, in Patent Document 1, no mechanism is provided to move the control console, and the passenger / alighting passage is narrowed by the control console, making it difficult for the operator to pass smoothly through the passage. On the other hand, in Patent Document 2, since no mechanism is provided to adjust the height of the control lever relative to the driver's seat, it is difficult for operators of various body types to operate the control lever in a comfortable posture.

[0010] Therefore, it is considered to assemble a mechanism capable of moving in the direction of widening the passenger boarding / alighting passage, and a mechanism for adjusting the height of the operating lever relative to the driver's seat (height adjustment mechanism), on the control panel on the passenger boarding / alighting passage side. In this case, since a door lock lever is provided on the control panel on the passenger boarding / alighting passage side, the position of the door lock lever changes in conjunction with the control panel whose position is changed by the height adjustment mechanism. When the height position of the operating lever is adjusted by the height adjustment mechanism, and thus the height position of the door lock lever changes, there is a problem that the operator sitting in the driver's seat may feel discomfort when holding the handle of the door lock lever. Furthermore, since the door lock lever prevents the actuator from operating, it is preferable that it always be in the same position, but if the position changes due to the height adjustment mechanism, it will also reduce the operability of the door lock lever.

[0011] The purpose of this invention is to provide an engineering machine that can maintain good operability of the door lock lever even when the height position of the operating lever is adjusted relative to the driver's seat.

[0012] The engineering machinery of the present invention includes: a driver's seat; a control console having an operating lever for operating an actuator; and a door lock lever disposed on the control console and displaceable between a locked position that prohibits the operation of the actuator corresponding to the operation of the operating lever and a locked-out position that allows the operation of the actuator corresponding to the operation of the operating lever, wherein the control console includes: a support shaft disposed on a seat base on which the driver's seat is mounted; a rotating frame rotatably supported on the support shaft in a vertical direction and on which the operating lever is mounted; and a height adjustment mechanism that adjusts the position of the rotating frame relative to a rotation direction centered on the support shaft. The door lock rod comprises: a base plate rotatably supported on a first shaft provided on the rotating frame, and a second shaft provided at a different position from the first shaft; and a rod member integrally provided on the base plate and having a gripping portion for operator handling, a guide member provided on the seat base that is rotatable in the fore-and-aft direction of the driver's seat, a guide groove formed on the guide member for engaging the second shaft of the door lock rod, the guide groove restricting the movement of the second shaft as the height adjustment mechanism causes the rotating frame to change position relative to the rotation direction centered on the support shaft, thereby suppressing changes in the height position of the gripping portion of the rod member.

[0013] According to the present invention, when the height of the operating lever is adjusted and the rotating frame rotates vertically around the support shaft, the movement of the second shaft body provided on the base plate of the door lock lever is limited by the guide groove of the guide member. This suppresses changes in the height position of the door lock lever's grip portion. Attached Figure Description

[0014] Figure 1 This is a left-side view of a hydraulic excavator according to an embodiment of the present invention.

[0015] Figure 2 It is a three-dimensional view showing the driver's seat, control console, door lock levers, etc.

[0016] Figure 3 This is a left-side view showing the operating lever at the middle height via the height adjustment mechanism.

[0017] Figure 4 It is an exploded perspective view showing the support shaft, rotating frame, door lock rod, operating lever, guide plate, etc.

[0018] Figure 5 This is a left-side view showing the lever at its maximum height via the height adjustment mechanism.

[0019] Figure 6 This is a left-side view showing the operating lever at its minimum height via the height adjustment mechanism.

[0020] Figure 7 This is a left-side view showing the initial state of the joystick's jump action.

[0021] Figure 8 This is a left-hand view showing the state of the joystick halfway to the upper limit position.

[0022] Figure 9 This is a left-hand view showing the state of the joystick being moved to the upper limit position.

[0023] Figure 10 This is a schematic diagram showing the displacement of the positioning pin, the second shaft, and the handle of the door lock lever when the height of the operating lever is adjusted. Detailed Implementation

[0024] Hereinafter, taking an application to a hydraulic excavator as an example, an embodiment of the engineering machinery of the present invention will be described in detail with reference to the accompanying drawings. Furthermore, in this embodiment, the travel direction of the hydraulic excavator is defined as the forward-backward direction, and the direction orthogonal to the travel direction of the hydraulic excavator is defined as the left-right direction.

[0025] In the diagram, the hydraulic excavator 1, representing construction machinery, has a tracked lower traveling body 2 capable of self-propelled movement in the forward and backward direction, and an upper slewing body 3 rotatably mounted on the lower traveling body 2. The lower traveling body 2 and the upper slewing body 3 constitute the body of the hydraulic excavator 1. A working device 4 is mounted on the front side of the upper slewing body 3, capable of pitching. The hydraulic excavator 1 travels at the work site via the lower traveling body 2, while rotating the upper slewing body 3 and simultaneously pitching the working device 4, thereby performing excavation operations such as digging sand and soil.

[0026] The upper slewing body 3 has a slewing frame 5 that serves as a base. A counterweight 6 is installed at the rear of the slewing frame 5 to achieve weight balance with the working device 4. An engine, hydraulic pump, heat exchanger, and other mounting equipment (not shown) are mounted on the slewing frame 5 and in front of the counterweight 6. These mounting devices are covered by an outer cover 7 mounted on the slewing frame 5. A driver's cab 8 is located on the front left side of the upper slewing body 3.

[0027] The driver's cab 8 is box-shaped, rising upwards from the slewing frame 5, and the interior of the driver's cab is divided into sections. On the left side of the driver's cab 8 are a passenger / landing hatch 8A for the operator to enter and exit the driver's cab 8, and a door 8B for opening and closing the passenger / landing hatch 8A. The lower side of the driver's cab 8 is covered by a floor component 9. The floor component 9 constitutes the floor of the driver's cab 8, such as... Figure 2 As shown, the plate is formed into a rectangular shape that is longer in the front-to-back direction. The driver's seat 12, left control console 13, right control console 14, door lock bar 25, etc. are provided in the driver's cab 8. The left front part of the floor component 9 becomes the passenger access passage 9A for the operator to move (passenger and passenger) between the passenger access port 8A of the driver's cab 8 and the driver's seat 12.

[0028] The driver's seat support platform 10 is located at the center of the floor component 9 in the front-rear direction. The driver's seat support platform 10 comprises a base 10A fixed to the floor component 9, a position adjustment mechanism 10B mounted on the base 10A, and a seat base 11 mounted on the position adjustment mechanism 10B. Since operators of various sizes sit in the driver's seat 12, the optimal position of the control lever varies depending on the operator. Therefore, by providing the position adjustment mechanism 10B on the driver's seat support platform 10, the positions of the driver's seat 12, the left control console 13, and the right control console 14 can be adjusted in both the front-rear and vertical directions.

[0029] The seat base 11 is positioned above the position adjustment mechanism 10B, forming a base for mounting the driver's seat 12, the left console device 13, and the right console device 14, etc. The seat base 11 is generally flat and box-shaped, such as... Figure 4As shown, a left rear protruding plate 11A protruding upward is provided at the left rear part of the seat base 11, and a support shaft 15 (described later) is provided on the left rear protruding plate 11A. On the other hand, a right rear protruding plate (not shown) is provided at the right rear part of the seat base 11 at a position symmetrical to the left rear protruding plate 11A in the left-right direction, and a support shaft (not shown) is provided on the right rear protruding plate.

[0030] A left front protruding plate 11B protruding downwards is provided at the left front part of the seat base 11. Furthermore, a left middle protruding plate 11C protruding downwards is provided at the middle part of the seat base 11 in the front-rear direction, near the left rear protruding plate 11A. A guide plate shaft 11D, a stop shaft 11E, and a lower locking pin 11F are spaced apart along the front-rear direction at the lower end of the left front protruding plate 11B, and each protrudes to the left from the left front protruding plate 11B.

[0031] A guide plate 26, described later, is rotatably mounted on the protruding end side of the guide plate shaft 11D in the front-rear direction. The stop shaft 11E holds the guide plate 26 in place by abutting against it. Figure 3 The rod height adjustment posture is shown. One end of the coil spring 31, described later, is locked to the lower locking pin 11F. On the other hand, a lower gas spring pin 11G is fixed to the lower end side of the left middle protruding plate 11C, and the lower gas spring pin 11G protrudes to the left from the left middle protruding plate 11C. The bottom side of the gas spring 30, described later, is mounted on the lower gas spring pin 11G.

[0032] The driver's seat 12 is mounted on the seat base 11 of the driver's seat support platform 10. A left control console 13 with an operating lever 19 is located on the left side of the driver's seat 12, and a right control console 14 with an operating lever 20 is located on the right side of the driver's seat 12. The operator sitting in the driver's seat 12 controls the operation of actuators such as the rotary motor driving the upper rotary body 3 and the hydraulic cylinder driving the working device 4 by operating these left and right operating levers 19 and 20.

[0033] Next, the left control console device 13 and the right control console device 14 of this embodiment will be described. These left control console devices 13 and right control console devices 14 are formed to be approximately symmetrical in the left-right direction. Therefore, the structure of the control console device 13 located on the passenger boarding / alighting passage 9A side will be described in detail below. Regarding the right control console device 14, the components corresponding to the constituent components of the left control console device 13 will be marked with the same symbols, and their descriptions will be omitted.

[0034] The left control console 13 is located on the left side of the driver's seat 12 and has an operating lever 19 for operating the actuators. The left control console 13 constitutes a control console located on the passenger / passage passage 9A side of the floor component 9. The left control console 13 is configured to include a support shaft 15, a rotating bracket 16, a rotating frame 17, a door lock lever 25, a guide plate 26, etc.

[0035] The support shaft 15 is located at the rear left part of the seat base 11 and protrudes to the left. The support shaft 15 is cylindrical and can rotatably support the rotating bracket 16 and the rotating frame 17 relative to the seat base 11.

[0036] The rotating bracket 16 is disposed adjacent to the left side of the seat base 11. For example... Figure 4 As shown, the rotating bracket 16 is integrally formed as a plate extending in the front-rear direction. A shaft insertion hole 16A is formed on the upper rear side of the rotating bracket 16, through which a support shaft 15 is inserted via a bearing. Thus, the rotating bracket 16 can rotate vertically about the support shaft 15. Multiple (e.g., three) height adjustment holes 16B, 16C, and 16D are provided on the front end side of the rotating bracket 16. These height adjustment holes 16B, 16C, and 16D are arranged at constant intervals on an arc of radius R1 centered on the center of the shaft insertion hole 16A (the axis of the support shaft 15). The locating pin 23, described later, selectively engages with any one of the height adjustment holes 16B, 16C, and 16D.

[0037] An upper gas spring pin 16E is provided at the middle of the length direction (front-to-back direction) of the rotating bracket 16. The upper gas spring pin 16E is a stepped cylindrical shape that protrudes to the left from the rotating bracket 16. The rod side of the gas spring 30 is rotatably mounted to the protruding end of the upper gas spring pin 16E. In addition, a shaft mounting plate 16G is mounted on the front side of the rotating bracket 16 via a spacer 16F. A stepped cylindrical third shaft 16H protruding to the left is provided on the shaft mounting plate 16G, and the protruding end of the third shaft 16H engages with the second guide groove 28 of the guide plate 26.

[0038] The rotating frame 17 is disposed adjacent to the left side of the rotating bracket 16. The rotating frame 17 is integrally formed as a frame extending in the front-rear direction. A shaft insertion hole 17A is formed on the rear side of the rotating frame 17, and a support shaft 15 is inserted through the shaft insertion hole 17A via a bearing. Thus, the rotating frame 17 can rotate in the up-down direction around the support shaft 15. A square cylindrical rear mounting part 17B is provided above the shaft insertion hole 17A in the rotating frame 17. An armrest 18 for the operator sitting in the driver's seat 12 to place their arm is installed on the rear mounting part 17B.

[0039] A box-shaped front mounting portion 17C is provided on the front side of the rotating frame 17. An operating lever 19 is mounted on the front mounting portion 17C, and a pin support housing 22 constituting the height adjustment mechanism 21 is provided at the front end of the front mounting portion 17C. In addition, a cylindrical first shaft 17D is provided on the front mounting portion 17C protruding to the left, and a base plate 25A of the door lock lever 25 is rotatably supported on the first shaft 17D.

[0040] Operating lever 19 is located on the left control console 13, and operating lever 20 is located on the right control console 14. These left and right operating levers 19 and 20 are operated by the operator to control actuators such as the rotary motor that performs the rotation of the upper rotary body 3 and the hydraulic cylinder that constitutes the working device 4. Operating lever 19 is configured to include: a pressure-reducing valve type pilot valve (not shown), which is mounted on the front mounting part 17C of the rotating frame 17; and a lever part 19A, which extends upward from the pilot valve and is held by the operator. The right-side operating lever 20 is also configured to include a pressure-reducing valve type pilot valve (not shown) and a lever part 20A for the operator to hold.

[0041] A height adjustment mechanism 21 is located at the front of the left console device 13, adjusting the height position of the operating lever 19 relative to the driver's seat 12 in stages (e.g., three stages). Furthermore, a height adjustment mechanism for adjusting the height position of the operating lever 20 is also located at the front of the right console device 14, and the right-side height adjustment mechanism is configured similarly to the left-side height adjustment mechanism 21. Therefore, the description of the left-side height adjustment mechanism 21 will be provided below, omitting the description of the right-side height adjustment mechanism. Figure 4 As shown, the height adjustment mechanism 21 is configured to include three height adjustment holes 16B, 16C, and 16D provided on the rotating bracket 16, a pin support housing 22, a positioning pin 23, and a release lever 24.

[0042] A pin support housing 22 is disposed at the front end of the front mounting portion 17C constituting the rotating frame 17. The pin support housing 22 is formed into a square tube extending in the vertical direction, and a pin insertion hole 22A extending in the horizontal direction is provided on the lower end side of the pin support housing 22. In addition, a rod insertion hole (not shown) is provided on the front surface of the pin support housing 22, located above the pin insertion hole 22A and extending in the front-rear direction.

[0043] The locating pin 23 is movably supported on the pin support housing 22. The locating pin 23 is formed as a cylinder extending in the left-right direction and is movably inserted into a pin insertion hole 22A provided in the pin support housing 22 in the axial (left-right) direction. The locating pin 23 is forceped in a direction protruding toward the rotating bracket 16 by a force-applying component (not shown) such as a spring. Furthermore, when the rotating frame 17 rotates about the support shaft 15, the locating pin 23 selectively inserts into any one of the three height adjustment holes 16B, 16C, and 16D provided in the rotating bracket 16.

[0044] For example, such as Figure 5 As shown, when the locating pin 23 is inserted into the height adjustment hole 16B, the height position of the operating lever 19 is set to the maximum height. Additionally, as... Figure 6 As shown, when the locating pin 23 is inserted into the height adjustment hole 16D, the height position of the operating lever 19 is set to the minimum height. Furthermore, as... Figure 3 As shown, when the locating pin 23 is inserted into the height adjustment hole 16C, the height position of the operating lever 19 is set to an intermediate height, which is between the maximum and minimum heights. Thus, by locking the rotating frame 17, on which the operating lever 19 is mounted, at any of the height positions of the height adjustment holes 16B, 16C, and 16D, the height position of the operating lever 19 relative to the driver's seat 12 can be adjusted in three stages. In this state, the rotating bracket 16 is connected to the rotating frame 17, and the locating pin 23 and the height adjustment holes 16B, 16C, and 16D constitute the connecting part that connects the rotating bracket 16 and the rotating frame 17.

[0045] Release lever 24 is located above the positioning pin 23 and rotatably mounted on the pin support housing 22. Release lever 24 is a rod-shaped body extending in the front-rear direction and rotatably supported in a rod insertion hole (not shown) in the pin support housing 22. Release lever 24 protrudes forward from the pin support housing 22, and its protruding end becomes an operating part extending in the left-right direction from the front end of the left control console device 13 (see reference). Figure 2 The operator, seated in the driver's seat 12, operates the control unit of the release lever 24 to rotate the release lever 24.

[0046] Inside the pin support housing 22, there is a conversion component (not shown) that converts the rotational movement of the release lever 24 into the linear axial movement of the positioning pin 23. Therefore, when the operator rotates the release lever 24, the rotational movement of the release lever 24 is converted by the conversion component into the linear axial movement of the positioning pin 23. As a result, the positioning pin 23, which is inserted into any one of the height adjustment holes 16B to 16D of the rotating bracket 16, overcomes the force-applying component and disengages from the height adjustment holes 16B to 16D. Therefore, the locking state of the rotating frame 17 is released, and the rotating frame 17 is configured to rotate vertically about the support shaft 15 together with the operating lever 19.

[0047] Next, the door lock lever 25 installed on the left control console device 13 will be described.

[0048] Door lock lever 25 is provided on the left control console 13, located on the side of the passenger access passage 9A for the driver's seat 12, in both the left and right control consoles 13 and 14. Door lock lever 25 is activated by the operator or similar means. Figure 7 The lock position shown and Figure 3 The displacement between the lock release positions shown.

[0049] Keep the door lock lever 25 Figure 7 When the door lock lever 25 opens the passenger access passage 9A in the locked position shown, the pilot pressure supplied to the operating levers 19 and 20 is stopped. As a result, the operation of the actuator is prohibited regardless of the operation of the left and right operating levers 19 and 20, and even if the operator or others accidentally touch the operating levers 19 or the like while passing through the passenger access passage 9A, the accidental operation of the actuator can be prevented.

[0050] On the other hand, the door lock rod 25 remains Figure 3 When the door lock lever 25 blocks the passenger / passage passage 9A in the unlocked position shown, pilot pressure can be supplied to the operating levers 19 and 20. This allows the actuators corresponding to the operation of the left and right operating levers 19 and 20 to operate.

[0051] Among them, such as Figure 4 As shown, the door lock lever 25 is configured to include a flat substrate 25A and a lever member 25B integrally fixed to the substrate 25A. A shaft insertion hole 25C extending along the thickness direction is provided on the upper side of the substrate 25A, and a first shaft 17D protruding from the rotating frame 17 (front mounting portion 17C) is inserted through the shaft insertion hole 25C. Therefore, the door lock lever 25 is rotatably supported on the rotating frame 17 via the first shaft 17D and moves between a locked position and a locked-out position with the first shaft 17D as the center. A second shaft 25D is provided on the lower side of the substrate 25A. The second shaft 25D is formed as a cylinder extending in the left-right direction and protrudes to the left from the substrate 25A. The second shaft 25D is movably engaged with the guide groove 27 of the guide plate 26.

[0052] The rod component 25B is fixed to the base plate 25A by methods such as welding. The rod component 25B is formed, for example, by bending a round bar material. The rod component 25B is in the locked-out position when the door lock rod 25 is in the unlocked position. Figure 3 When the door lock lever 25 is in its position, it protrudes forward to block the boarding and alighting passage 9A. The end side of the lever component 25B becomes a grip 25E that is held by the operator or others when operating the door lock lever 25, and a handle 25F is installed on the grip 25E.

[0053] The guide plate 26, serving as a guide component, is rotatably mounted on the seat base 11. For example... Figure 3 as well as Figure 4 As shown, the guide plate 26 is formed as a flat plate extending in the vertical direction, and has a guide groove 27 and a second guide groove 28. A shaft insertion hole 26A extending in the thickness direction is provided on the lower side of the guide plate 26, and the shaft insertion hole 26A is inserted through a guide plate shaft 11D provided on the left front protruding plate 11B of the seat base 11 via a bearing.

[0054] Thus, the guide plate 26 is supported so that it can rotate in the front-to-back direction about the guide plate axis 11D, and when the height of the operating lever 19 is adjusted by the height adjustment mechanism 21, it remains... Figure 3 , Figure 5 as well as Figure 6 The lever height adjustment posture is shown. On the other hand, when the operating lever 19 is moved upward (in the direction of widening the passenger / passenger passage 9A) by the operating lever moving mechanism 29 described later, the guide plate 26 remains... Figures 7 to 9 The rod movement posture is shown. In this way, the guide plate 26 is displaced between the rod height adjustment posture and the rod movement posture with the guide plate axis 11D as the center.

[0055] The guide groove 27 is located above the shaft insertion hole 26A and is provided on the guide plate 26. The second shaft 25D of the base plate 25A of the door lock rod 25 is movably engaged with the guide groove 27. Thus, when the rotating frame 17, on which the operating lever 19 is mounted, rotates together with the door lock rod 25 around the support shaft 15 via the height adjustment mechanism 21, the movement of the second shaft 25D is restricted along the shape of the guide groove 27.

[0056] The guide groove 27 is configured such that the guide plate 26 is in a rod-moving posture. Figures 7 to 9 When the guide rod 19 is in the correct position, it becomes an arc with a radius R2 centered on the support shaft 15. An upper locking groove 27A is provided at the upper end of the guide groove 27. The upper locking groove 27A is located at a position further away from the support shaft 15 than the radius R2 of the guide groove 27, and communicates with the upper end of the guide groove 27. When the operating lever 19 moves to the position described later via the operating lever moving mechanism 29... Figure 9 At the upper limit position (jump position) shown, the second shaft 25D of the door lock lever 25 (base plate 25A) engages with the upper locking groove 27A from the guide groove 27. Thus, the movement of the second shaft 25D stops, and the operating lever 19 and the door lock lever 25 remain in place. Figure 9 The upper limit position.

[0057] The second guide groove 28 is disposed adjacent to the guide groove 27 on the guide plate 26. The second guide groove 28 forms part of the operating lever moving mechanism 29. The third shaft 16H disposed on the rotating bracket 16 (shaft mounting plate 16G) is movably engaged with the second guide groove 28. The second guide groove 28 moves the operating lever 19 upward through the operating lever moving mechanism 29, thus restricting the movement of the third shaft 16H when the rotating bracket 16 rotates upward about the support shaft 15.

[0058] The second guide groove 28 is formed as an arc with a radius R3 centered on the support shaft 15 when the guide plate 26 is in the rod moving posture. In this case, the radius R3 of the arc shape of the second guide groove 28 is set to be smaller than the radius R2 of the arc shape of the guide groove 27 (R2 > R3). Thus, when the guide plate 26 is in the rod moving posture, the guide groove 27 and the second guide groove 28 are arranged on arcs with different radii centered on the support shaft 15.

[0059] A lower locking groove 28A is provided at the lower end of the second guide groove 28. The lower locking groove 28A is located at a position further away from the support shaft 15 than the radius R3 of the second guide groove 28, and communicates with the lower end side of the second guide groove 28. When the third shaft 16H of the rotating bracket 16 engages with the lower locking groove 28A, the guide plate 26 remains stationary. Figure 3 The rod height adjustment posture is shown in the figure. Furthermore, the guide plate 26 becomes a structure that transforms from the rod height adjustment posture to the rod movement posture by engaging with the second guide groove 28 from the lower locking groove 28A via the third shaft 16H.

[0060] An upper locking pin 26B is provided in the guide plate 26 at a position adjacent to the lower locking groove 28A. The upper locking pin 26B protrudes to the left from the guide plate 26, and the other end of the coil spring 31 is locked to the protruding end of the upper locking pin 26B.

[0061] The lever moving mechanism 29 is located on the left control console device 13. When the door lock lever 25 is moved to the locked position, the lever moving mechanism 29 causes the lever 19 and the door lock lever 25 to move together about the support shaft 15 in the direction that expands the passenger passage 9A, i.e., upwards. The lever moving mechanism 29 is configured to include a rotating bracket 16, a rotating frame 17, a door lock lever 25, a guide plate 26, a gas spring 30, and a coil spring 31.

[0062] A gas spring 30 is disposed between the seat base 11 and the rotating bracket 16. The bottom side of the gas spring 30 is rotatably mounted to a lower gas spring pin 11G provided on the seat base 11 (left middle protruding plate 11C), and the rod side of the gas spring 30 is rotatably mounted to an upper gas spring pin 16E provided on the rotating bracket 16. Thus, the gas spring 30 applies force in the direction that causes the rotating bracket 16 to rotate upward about the support shaft 15.

[0063] A coil spring 31 is disposed between the seat base 11 and the guide plate 26. The coil spring 31 is a tension spring, with one end locked to the lower locking pin 11F of the seat base 11 and the other end locked to the upper locking pin 26B of the guide plate 26. The coil spring 31 applies force in the direction that causes the guide plate 26 to abut against the stop shaft 11E with the guide plate shaft 11D as the center.

[0064] The left control console device 13 of the hydraulic excavator 1 in this embodiment has the structure described above. Next, the action (jumping action) of moving the control lever 19 upward (in the direction of expanding the passenger and alighting passage 9A) by means of the control lever moving mechanism 29 will be described.

[0065] When using the lever movement mechanism 29 to perform the jumping action of the lever 19, for example, to make the lever 19 located in the position... Figure 3 The door lock lever 25, in the unlocked position, rotates upward around the first shaft 17D protruding from the rotating frame 17. Thus, as... Figure 7 As shown, the second shaft 25D, located on the door lock rod 25, presses forward against the coil spring 31 and against the guide plate 26. Therefore, the guide plate 26 rotates forward about the guide plate shaft 11D, shifting to the rod moving position. At this time, the third shaft 16H, protruding from the rotating bracket 16, disengages from the lower locking groove 28A of the guide plate 26 and engages with the second guide groove 28.

[0066] Therefore, the rotating bracket 16 rotates upward about the support shaft 15 via the gas spring 30. At this time, the positioning pin 23 of the height adjustment mechanism 21 engages with any one of the height adjustment holes 16B to 16D of the rotating bracket 16 (for example, height adjustment hole 16C), thus the rotating frame 17 and the rotating bracket 16 become integrated. Therefore, the rotating bracket 16, the rotating frame 17, the operating lever 19, and the door lock lever 25 become a single unit and rotate upward about the support shaft 15.

[0067] When the guide plate 26 is displaced to the lever moving posture, the guide groove 27 and the second guide groove 28 of the guide plate 26 are respectively arranged on arcs with different radii centered on the support shaft 15. Therefore, the second shaft 25D of the door lock lever 25 can move smoothly upward along the guide groove 27, and the third shaft 16H of the rotating bracket 16 can move smoothly upward along the second guide groove 28. As a result, the operating lever 19 and the door lock lever 25 can move to the upper limit position in a mutually linked state, which improves its operability.

[0068] Moreover, such as Figure 9As shown, the second shaft 25D of the door lock lever 25 engages with the upper locking groove 27A provided on the upper end side of the guide groove 27, thereby stopping the movement of the second shaft 25D, and stopping the operating lever 19 and the door lock lever 25 at the upper limit position (jump position). Thus, when the door lock lever 25 is in the locked position, moving the operating lever 19 and the door lock lever 25 in the direction of expanding the passenger passage 9A can ensure that the space of the passenger passage 9A is larger.

[0069] Thus, when the operating lever 19 and the door lock lever 25 are moved to the upper limit position, the second shaft 25D of the door lock lever 25 engages with the upper locking groove 27A provided on the upper end side of the guide groove 27. Therefore, the rotating frame 17, which is connected to the door lock lever 25 via the first shaft 17D, is prevented from rotating around the support shaft 15. Therefore, the positioning pin 23 installed on the height adjustment mechanism 21 of the rotating frame 17 cannot be inserted or removed relative to the height adjustment holes 16B, 16C, and 16D of the rotating bracket 16. That is, in this embodiment, when the operating lever 19 and the door lock lever 25 are moved to the upper limit position, it is possible to prevent the adjustment of the height position of the operating lever 19 relative to the driver's seat 12.

[0070] As a result, for example, when the operating lever 19 and the door lock lever 25 are moved to the upper limit position, it is possible to prevent the operating lever 19 from being set to an unexpected height position due to accidental contact with the release lever 24 of the height adjustment mechanism 21 by the operator or others. Therefore, with the door lock lever 25 moved to the lock-out position, the operator sitting in the driver's seat 12 can accurately adjust the height position of the operating lever 19.

[0071] Next, the height adjustment operation of adjusting the height position of the control lever 19 relative to the driver's seat 12 via the height adjustment mechanism 21 will be explained.

[0072] When adjusting the height of the operating lever 19 using the height adjustment mechanism 21, for example, the door lock lever 25, which is located at the upper limit position, is rotated downward (forward) about the first axis 17D. Thus, as... Figure 8 As shown, the second shaft 25D disengages from the upper locking groove 27A of the guide groove 27 and engages with the guide groove 27. In this state, the door lock rod 25 is pressed downward against the gas spring 30.

[0073] Thus, the rotating bracket 16, rotating frame 17, operating lever 19, and door lock lever 25 become a single unit and rotate downwards around the support shaft 15. Then, as... Figure 7 As shown, when the third shaft 16H of the rotating bracket 16 reaches the lower end of the second guide groove 28 of the guide plate 26, the door lock rod 25 rotates further downward (forward) around the first shaft 17D.

[0074] Therefore, the second axis 25D of the door lock rod 25 presses the guide plate 26 backward, and the guide plate 26 rotates backward about the guide plate axis 11D. Thus, as... Figure 3 As shown, the third shaft 16H of the rotating bracket 16 engages with the lower locking groove 28A from the second guide groove 28. At this time, the guide plate 26 abuts against the stop shaft 11E of the seat base 11 via the coil spring 31, maintaining the rod height adjustment posture.

[0075] Thus, with the guide plate 26 maintaining the lever height adjustment posture, the rotating bracket 16 is fixed to the seat base 11 via the guide plate 26. In this state, the height of the operating lever 19 relative to the driver's seat 12 is adjusted using the height adjustment mechanism 21.

[0076] For example, such as Figure 3 As shown, with the positioning pin 23 of the height adjustment mechanism 21 inserted into the height adjustment hole 16C of the rotating bracket 16, the operator rotates the release lever 24, thereby disengaging the positioning pin 23 from the height adjustment hole 16C. As a result, the rotating frame 17, on which the operating lever 19 is mounted, can rotate vertically about the support shaft 15.

[0077] Therefore, when the rotating frame 17 is rotated upwards to insert the positioning pin 23 into the height adjustment hole 16B, as Figure 5 As shown, the height of the operating lever 19 can be adjusted to its maximum height. Furthermore, when the rotating frame 17 is rotated downwards to insert the positioning pin 23 into the height adjustment hole 16D, as... Figure 6 As shown, the height of the operating lever 19 can be adjusted to its minimum height. Furthermore, when the positioning pin 23 is inserted into the height adjustment hole 16C, as... Figure 3 As shown, the height of the operating lever 19 can be adjusted to the middle height.

[0078] Thus, when the height position of the operating lever 19 is adjusted using the height adjustment mechanism 21, the operating lever 19 mounted on the rotating frame 17 and the door lock lever 25 mounted on the rotating frame 17 via the first shaft 17D rotate together around the support shaft 15. The door lock lever 25 can rotate relative to the rotating frame 17 around the first shaft 17D, and its movement is restricted by the second shaft 25D provided on the door lock lever 25 through engagement with the guide groove 27 of the guide plate 26.

[0079] in, Figure 10 This indicates the displacement of the door lock lever 25 in three stages as the operating lever 19 changes height. When the operating lever 19 is at its middle height, the door lock lever 25 is in the middle position as shown by the solid line. When the operating lever 19 is at its maximum height, the door lock lever 25 is in the upper position as shown by the dashed line. When the operating lever 19 is at its minimum height, the door lock lever 25 is in the lower position as shown by the dashed line.

[0080] like Figure 10 As shown, the height adjustment holes 16B to 16D are arranged in an arc shape with a radius R1 centered on the support shaft 15. Therefore, the positioning pin 23 of the height adjustment mechanism 21 moves together with the rotating frame 17 along an arc-shaped path centered on the support shaft 15. On the other hand, the door lock rod 25 is rotatably mounted on the rotating frame 17 via the first shaft 17D, and the second shaft 25D provided on the door lock rod 25 engages with the guide groove 27 of the guide plate 26. Therefore, the movement of the second shaft 25D is limited by the shape of the guide groove 27. As a result, even when the door lock rod 25 is displaced to the middle position, the upper position, or the lower position, the change in the height position of the gripping part 25E of the door lock rod 25 (rod member 25B) can be suppressed, and the gripping part 25E can maintain a constant position. That is, the guide groove 27 restricts the movement of the second shaft 25D as the height adjustment mechanism 21 causes the rotating frame 17 to change position centered on the support shaft 15, thus suppressing the change in the height position of the gripping part 25E of the door lock rod 25.

[0081] Therefore, by adjusting the height of the operating lever 19, even if the door lock lever 25 is moved to the middle, upper, or lower positions, the operator sitting in the driver's seat 12 can comfortably hold the grip portion 25E of the door lock lever 25 in a generally constant position by extending their arm while maintaining the same posture. As a result, for example, the door lock lever 25 can be smoothly operated from the unlocked position to the locked position, and operability relative to the door lock lever 25 can be well maintained even when the height of the operating lever 19 is adjusted. In this case, the groove shape of the guide groove 27 is consistent with the movement path depicted by the second shaft 25D when the operating lever 19 is moved in the direction of widening the passenger / passage passage 9A via the operating lever moving mechanism 29. As a result, when the operating lever 19 is moved to the upper limit position, the grip portion 25E of the door lock lever 25 can be kept in a constant position by utilizing the guide groove 27, which forms the movement path of the second shaft 25D, when the height of the operating lever 19 is adjusted.

[0082] Furthermore, in this embodiment, the constant position maintained by the grip portion 25E of the door lock lever 25 during the adjustment of the height position of the operating lever 19 is not limited to one point. For example, it is defined as the range in which the operator can store the grip portion 25E in his palm without changing his posture when the operator holds the door lock lever 25 in the middle position.

[0083] Thus, in the hydraulic excavator 1 of this embodiment, the left control console device 13 located on the side of the passenger access passage 9A for the driver's seat 12 includes: a support shaft 15, which is disposed on a seat base 11 for mounting the driver's seat 12; a rotating frame 17, which is rotatably supported on the support shaft 15 in the vertical direction and is used to mount the operating lever 19; and a height adjustment mechanism 21, which adjusts the position of the rotating frame 17 relative to the rotation direction centered on the support shaft 15. The door lock lever 25 includes: a base plate 25A, which is rotatably supported on a first shaft 17D disposed on the rotating frame 17, and a second shaft 25D is disposed at a different position from the first shaft 17D; and a lever member 25B, which is integrally disposed on the base plate 25A and has a gripping part 25E for the operator to hold. A guide plate 26 is provided on the seat base 11, which can rotate along the front and rear direction of the driver's seat 12. A guide groove 27 is formed on the guide plate 26 for engaging the second shaft 25D of the door lock rod 25. The guide groove 27 restricts the movement of the second shaft 25D as the height adjustment mechanism 21 causes the rotating frame 17 to change position relative to the rotation direction centered on the support shaft 15, and suppresses the change in the height position of the grip portion 25E of the rod member 25B.

[0084] According to this structure, when the height position of the operating lever 19 is adjusted relative to the driver's seat 12 by the height adjustment mechanism 21, the rotating frame 17 and the door lock lever 25 rotate together in the vertical direction around the support shaft 15. At this time, the movement of the second shaft 25D provided on the base plate 25A of the door lock lever 25 is limited by the guide groove 27 of the guide plate 26. As a result, changes in the height position of the grip portion 25E of the door lock lever 25 can be suppressed.

[0085] In this embodiment, the left control console 13 includes a lever moving mechanism 29. When the door lock lever 25 is moved to the locked position, the lever moving mechanism 29 causes the rotating frame 17, on which the lever 19 is mounted, to rotate upward together with the door lock lever 25. The shape of the guide groove 27 is consistent with the movement path traced by the second axis 25D when the rotating frame 17 is rotated upward by the lever moving mechanism 29. According to this structure, when the lever 19 is rotated upward toward the upper limit position, the guide groove 27, which forms the movement path of the second axis 25D, can suppress changes in the height position of the grip portion 25E of the door lock lever 25.

[0086] In this embodiment, the guide plate 26 has a second guide groove 28 formed adjacent to the guide groove 27. The operating lever moving mechanism 29 includes: a rotating bracket 16 having a third shaft 16H that engages with the second guide groove 28 and is supported on the support shaft 15 in a state that allows it to rotate in the vertical direction; and a connecting portion that connects the rotating bracket 16 to the rotating frame 17. The guide groove 27 and the second guide groove 28 are arranged on arcs with different radii centered on the support shaft 15.

[0087] According to this structure, when the operating lever 19 is rotated upward using the operating lever moving mechanism 29, the second shaft 25D provided on the door lock lever 25 and the third shaft 16H provided on the rotating bracket 16 can move along an arc-shaped path centered on the support shaft 15. As a result, the operating lever 19 and the door lock lever 25 can be rotated upward in a mutually linked state and moved in the direction of expanding the passenger passage 9A (upper limit position), which improves its operability.

[0088] Furthermore, in the embodiments, a hydraulic excavator 1 in which the left front part of the floor component 9 forms a passenger access passage 9A is exemplified, wherein a door lock lever 25, an operating lever moving mechanism 29, etc., are provided on the left control console device 13 located on the passenger access passage 9A side. However, the present invention is not limited to this; in a hydraulic excavator in which the right front part of the floor component forms a passenger access passage, a door lock lever, an operating lever moving mechanism, etc., may also be provided on the right control console device located on the passenger access passage side.

[0089] In this embodiment, an example is shown where the rotating bracket 16 has three height adjustment holes through which the positioning pins 23 of the height adjustment mechanism 21 are inserted. However, the present invention is not limited to this; for example, it may be configured to have two or four or more height adjustment holes.

[0090] In this embodiment, a hydraulic excavator 1 with a tracked lower traveling body 2 is exemplified as an engineering machine equipped with left and right control consoles 13 and 14. However, the present invention is not limited thereto, and can be widely applied to other engineering machines such as hydraulic excavators with wheeled lower traveling bodies.

[0091] Symbol Explanation

[0092] 9—Floor component; 9A—Passenger / alight passage; 11—Seat base; 12—Driver's seat; 13—Left control console device; 14—Right control console device; 15—Support shaft; 16—Rotating bracket; 16B, 16C, 16D—Height adjustment holes (connecting parts); 16H—Third shaft; 17—Rotating frame; 17D—First shaft; 19, 20—Operating lever; 21—Height adjustment mechanism; 23—Positioning pin (connecting part); 25—Door lock lever; 25A—Base plate; 25B—Lever component; 25D—Second shaft; 25E—Holding part; 26—Guide plate (guide component); 27—Guide groove; 28—Second guide groove; 29—Operating lever moving mechanism.

Claims

1. An engineering machine, comprising: Driver's seat; A control console having an operating lever for operating the actuator; and A door lock lever is disposed on the control panel and is displaceable between a locked position that prohibits the operation of the actuator corresponding to the operation of the control lever and a locked-out position that allows the operation of the actuator corresponding to the operation of the control lever. The engineering machinery is characterized by the following features: The console device includes: a support shaft disposed on a seat base on which the driver's seat is mounted; a rotating frame rotatably supported on the support shaft in a vertical direction and on which the operating lever is mounted; a height adjustment mechanism that adjusts the position of the rotating frame relative to a rotation direction centered on the support shaft; and a rotating bracket having a plurality of height adjustment holes. The height adjustment mechanism has a positioning pin disposed on the rotating frame. The positioning pin is selectively inserted into any one of a plurality of height adjustment holes to fix the rotating frame relative to the rotating bracket and to adjust the position of the rotating frame relative to the rotation direction centered on the support shaft. The door lock rod comprises: a base plate rotatably supported on a first shaft disposed on the rotating frame, and a second shaft disposed at a different position from the first shaft; and a rod member integrally disposed on the base plate and having a gripping portion for operator handling. The seat base is provided with a guide component that is rotatable in the fore-and-aft direction of the driver's seat. The guide member has a guide groove that engages with the second shaft of the door lock rod. The guide groove restricts the movement of the second shaft as the height adjustment mechanism causes the rotating frame to change position relative to the rotation direction centered on the support shaft, thereby suppressing changes in the height position of the grip portion of the rod component.

2. The engineering machinery according to claim 1, characterized in that, The control console device includes a lever moving mechanism, which, when the door lock lever is moved to the locked position, causes the rotating frame on which the lever is mounted to rotate upward together with the door lock lever. The shape of the guide groove is consistent with the movement path traced by the second shaft when the rotating frame is rotated upward using the operating lever moving mechanism.

3. The engineering machinery according to claim 2, characterized in that, The guiding component has a second guiding groove formed adjacent to the guiding groove. The rotating bracket has a third shaft that engages with the second guide groove and is supported on the support shaft in a state that allows it to rotate in the vertical direction. The operating lever moving mechanism includes: the rotating bracket; and a connecting part that connects the rotating bracket to the rotating frame. The guide groove and the second guide groove are arranged on arcs with different radii centered on the support axis.

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