JP5997191B2 - Construction machinery - Google Patents

Description

  The present invention relates to a crawler type construction machine, and more particularly to a construction machine that can change the interval between left and right crawler type traveling devices.

  Some small hydraulic excavators improve travel stability and body stability during excavation work by increasing the distance between the left and right crawler type travel devices (hereinafter referred to as vehicle width), and narrowing by narrowing the vehicle width. There is a vehicle equipped with a vehicle width changing device that enables traveling in an alley or the like and transportation by a mini truck.

  As the operation means of the vehicle width changing device, for example, a blade lifting lever provided on the right side of the driver's seat has a function as a vehicle width changing operation lever, and the lever function is achieved by switching the solenoid valve by the operator's switch operation. What has been changed over has been put to practical use. Further, as described in Patent Document 1, there is known one provided with an operation lever (hereinafter referred to as a vehicle width changing operation lever) on the front side surface of the seat base below the driver's seat.

JP 2000-198471 A

  Unlike a standard machine with a large rear end radius, a hydraulic excavator with a small vehicle size and a small rear end radius (hereinafter referred to as a rear ultra-small swivel) has a limited equipment mounting space. Oil tanks are often placed on the front right side of the aircraft. Therefore, the visibility of the foot part (crawler) from the right side of the driver's seat is not good.

  In such a rear ultra-small turning machine, for example, when the blade lifting lever provided on the right side of the driver's seat has a function as a vehicle width changing operation lever, the operator operates the vehicle width changing operation lever. Since it is difficult to visually check the position of the crawler, it takes time to adjust the vehicle width.

  Further, in the hydraulic excavator described in Patent Document 1, the operator needs to take a posture bent to the front side in order to operate the vehicle width changing operation lever arranged on the front side surface of the seat base below the driver's seat, Again, it is difficult to visually check the position of the crawler, and it takes time to adjust the vehicle width. In addition, when a dedicated vehicle width change operation lever is provided on a small hydraulic excavator with limited equipment mounting space as in Patent Document 1, an error occurs during normal work that does not require operation of the vehicle width change operation lever. Therefore, a part of the operator's body (in the case of Patent Document 1, the operator's foot) may come into contact with the vehicle width changing operation lever, and the vehicle width may be changed against the operator's intention.

  The present invention has been made in view of the above-described problems, and its purpose is construction that can operate the vehicle width changing operation lever while visually checking the position of the crawler and can prevent erroneous operation of the vehicle width changing operation lever. Is to provide a machine.

(1) In order to solve the above problems, the present invention includes a lower traveling body that can change the interval between the left and right crawler traveling devices, and an upper revolving body that is turnably mounted on the lower traveling body. The upper revolving body includes a revolving frame forming a support structure, a counterweight provided at a rear portion of the revolving frame, and supported by the revolving frame and provided on the front side of the counterweight. A seat base that constitutes a revolving structure support structure together with a frame, a driver seat installed on the seat base, and a floor panel that is located in front of the seat base and the driver seat and forms an access passage for an operator Yes, and have a said left operation respectively disposed on the left portion and right portion of the driver's seat on the seat base lever unit and the right operating lever device, before The seat base part also serves as an engine cover that covers equipment including the engine and the hydraulic pump mounted on the swivel frame, and a fuel tank and a hydraulic oil tank are arranged on the front right side portion of the swivel frame. In the constructed construction machine, the interval between the left and right crawler type traveling devices is changed by being arranged between the left and right crawler type traveling devices and controlling the supply and discharge of pressure oil by the vehicle width change control valve. A hydraulic vehicle width change cylinder, a vehicle width change operation lever that is disposed on the left side of the driver's seat of the revolving structure support structure and operates the vehicle width change control valve, and the vehicle width change operation lever is neutral. position and a lever locking device for locking in the seat base includes a central seat base portion to which the driver's seat is mounted, the left side of the center seat base portion A left seat base portion on which the left operating lever device is disposed, and a right seat base portion on the right side of the central seat base portion on which the right operating lever device is disposed, and the left side The outer periphery of the seat base is covered with an exterior cover, and the vehicle width changing operation lever is disposed at a rear portion of the left operation lever device of the left seat base, and the upper panel of the left seat base The vehicle width changing operation lever is attached to the lever portion attached to the revolving structure support structure so as to be tiltable, and to the upper end of the lever portion. and a grip portion, before Symbol lever locking device includes a movable plate pivotally mounted between a fallen position and the standing position via a hinge to the upper panel, the The movable plate is formed with a notch recess at a side edge opposite to the hinge, and the movable plate closes the lever hole when the movable plate is in the lying position and the lever portion in the notch recess. The lever part is locked by sandwiching the lever part, and when in the standing position, the lever part is unlocked by opening the lever hole and releasing the notch recess from the lever part. It shall be configured.

  In the present invention configured as described above, since the vehicle width changing operation lever is disposed on the left side portion of the driver's seat of the revolving structure support structure, the construction machine can visually recognize the body foot portion (crawler) like a rear ultra-small revolving machine. Even if there is a restriction in performance, the operator can operate the vehicle width change operation lever while visually checking the position of the crawler by keeping an eye on the left side of the driver's seat of the revolving structure support structure with good visibility. The vehicle width can be easily adjusted.

  In addition, during normal work that does not require operation of the vehicle width change operation lever, erroneous operation of the vehicle width change operation lever can be prevented by locking the vehicle width change operation lever with the lever lock device.

  Furthermore, when the vehicle width changing lever is locked, the lever plate can be closed by the movable plate, preventing hot air from being blown from the lever hole, and rainwater or the like entering the engine chamber from the lever hole. Can be prevented. As a result, the living environment of the driver's seat can be kept good, and the operating environment of the devices installed in the engine compartment can be kept good.

  (2) In the above (1), preferably, the lever lock device has a grip portion provided so as to rise from the movable plate on the side edge portion side where the notch recess of the movable plate is formed. It shall be provided.

  As a result, the movable plate can be rotated through the grip portion, and the operator can smoothly perform the lock operation and the release operation of the vehicle width change operation lever.

  (3) In the above (1) or (2), preferably, the lever locking device includes a flexible plate-like sealing member attached to a surface of the movable plate on a side closing the lever hole. Shall be.

  As a result, when the vehicle width change operation lever is locked, the gap between the movable plate and the outer periphery of the lever hole can be closed with the seal member, and hot air in the engine compartment is more reliably prevented from being ejected from the lever hole. At the same time, it is possible to more reliably prevent rainwater and the like from entering the engine compartment from the lever hole. As a result, the driver's seat can be kept in a better living environment, and the operating environment of the devices installed in the engine compartment can be kept better.

  According to the present invention, the vehicle width changing operation lever can be operated while visually checking the position of the crawler, and erroneous operation of the vehicle width changing operation lever can be prevented.

It is a perspective view of a hydraulic excavator in a state where a working device and a blade are omitted. It is a side view of a hydraulic excavator in a state where a work device, a blade, and a canopy roof are omitted. It is a front view of a hydraulic excavator in a state where a work device and a blade are omitted. It is a figure which shows a part of right-and-left crawler type traveling apparatus and a vehicle width changing apparatus. It is a figure which shows a control valve unit and a center joint. It is a perspective view of a seat base in the state where an exterior cover, a driver's seat, a lever lock device, etc. were removed. It is a side view of a seat base in the state where an exterior cover, a driver's seat, a lever lock device, etc. were removed. It is a perspective view of the driver's seat part seen from the body left side back. It is a top view of a driver's seat left side part. It is an enlarged side view of a part above a lever hole of a vehicle width change operation lever. It is a perspective view of a lever lock device. It is a perspective view which shows the lever lock apparatus in the state which locked the vehicle width change operation lever. It is a perspective view which shows the lever lock apparatus in the state which cancelled | released the lock | rock of the vehicle width change operation lever. It is a figure showing the art of patent documents 1 with the operator who applied the technique of patent documents 1 to a back ultra-small turning machine, and has arranged the vehicle width change operation lever in the lower part of a driver's seat with the driver's seat. It is a figure which shows the hydraulic shovel by this Embodiment with the operator who seated on the driver's seat. It is a perspective view which shows the modification of a lever lock apparatus. It is a perspective view which shows the other modification of a lever lock apparatus.

  As a construction machine according to an embodiment of the present invention, a small hydraulic excavator (for example, a rear ultra-small turning machine) will be described as an example and described with reference to the drawings. In the present embodiment, “front, rear” and “left, right” mean directions or positions as viewed from the operator seated on the driver's seat.

~Constitution~
FIG. 1 is a perspective view of a hydraulic excavator in a state where a working device and a blade are omitted. The hydraulic excavator includes a lower traveling body 1, an upper revolving body 2 that is turnably mounted on the lower traveling body 1, and a work device (not shown) provided at a front portion of the upper revolving body 2. Yes.

  The lower traveling body 1 includes left and right crawler type traveling devices 11A and 11B (hereinafter referred to as traveling devices) and a center frame 10 that connects the left and right traveling devices 11A and 11B and supports the upper revolving body 2. . The left traveling device 11A includes a left side frame 12A and a left traveling motor 13A, and a left crawler 14A wound around the left side frame 12A and the left traveling motor 13A. The right traveling device 11B includes a right side frame. 12B and a right traveling motor (not shown), and a right crawler 14A wound around the right side frame 12B and the right traveling motor (not shown). At the front side portion of the center frame 10, a soil removal device composed of a blade lifting cylinder 15 and a blade (not shown) that is lifted and lowered by the blade lifting cylinder 15 is attached.

  The upper swing body 2 is positioned on the swivel frame 20 which is a basic support structure, a counterweight 21 (see FIG. 2) provided on the rear portion of the swivel frame 20, and the front side of the counterweight 21. A seat base 22 supported on the seat base 22, a driver seat 23 installed on the seat base 22, and a floor panel 24 which is located in front of the seat base 22 and the driver seat 23 and forms an entrance / exit passage for the operator. Yes. The swivel frame 20 and the seat base 22 constitute a swivel support structure 50 for mounting equipment and parts necessary for the operation of the hydraulic excavator including the counterweight 21 and the driver seat 23. Devices such as an engine and a hydraulic pump, which will be described later, are mounted on the rear portion. The seat base 22 also has an engine cover function, and devices such as the engine and the hydraulic pump are covered with the seat base 22. A hydraulic oil tank and a fuel tank (both not shown) are mounted on the right front portion of the revolving frame 20, and these are covered with a tank cover 25. The outer periphery of the revolving structure support structure is covered with an exterior cover 26.

  A support bracket 27 is provided on the front portion of the swivel frame 20, and a swing post type working device (not shown) is attached to the support bracket 27 so as to be swingable left and right. A traveling lever / pedal device 31 for operating the left and right traveling devices 11 </ b> A and 11 </ b> B is disposed on the front portion of the floor panel 24. A work device (not shown) and a turning device 40 (see FIG. 2) are provided on the left and right portions of the driver's seat 23 on the seat base 22 (on the upper panels 22b1 and 22c1 of the left and right seat base portions 22b and 22c described later). Left and right operating lever devices 32A and 32B are respectively disposed. A blade raising / lowering lever 33 for raising / lowering a blade (not shown) attached to the front side portion of the center frame 10 is disposed on the right side of the right operating lever device 32B on the seat base 22. The upper swing body 2 is provided with a two-column canopy 30. The canopy 30 includes left and right pillars 30A and 30B erected at the rear part of the swing body support structure 50, and left and right pillars 30A and 30B. And a roof 30C attached to the upper end.

  As a feature of the present embodiment, between the left operating lever device 32A and the left pillar 30A, that is, on the left side portion of the driver seat 23 of the seat base 22 (on the upper panel 22b1 of the left seat base portion 22b described later). A vehicle width changing operation lever 34 for changing the distance between the left and right crawlers 14A and 14B (hereinafter referred to as the vehicle width) is disposed on the rear side portion of the left operating lever device 32A. A lever lock device 35 that locks the vehicle width changing operation lever 34 at a neutral position is provided at a side edge portion of a lever hole (described later) of the operation lever 34.

  FIG. 2 is a side view of the excavator in a state in which the working device, the blades, and the canopy roof are omitted. A turning device 40 that is driven by a turning hydraulic motor and drives the upper turning body 2 to turn with respect to the lower traveling body 1 is provided at a central portion of the turning frame 20. An engine 41 (shown by a broken line in the figure) as a prime mover and a hydraulic pump (not shown) driven by the engine 41 are mounted on the rear portion of the turning frame 20 and below the seat base 22. . A control valve unit 42 that controls the direction and flow rate of the pressure oil supplied from the hydraulic pump to each of the plurality of hydraulic actuators including the traveling motor 13A, on the left front portion of the swivel frame 20 and below the floor panel 24. (Shown by broken lines in the figure) is arranged.

  FIG. 3 is a front view of the excavator in a state in which the working device and the blade are omitted. The center frame 10 includes a vehicle width changing device 51 at a lower portion thereof, and the left and right traveling devices 11A and 11B are attached to the center frame 10 via the vehicle width changing device 51. The undercarriage 1 can change the vehicle width 14C by operating the vehicle width changing device 51. By increasing the vehicle width 14C, the stability of the machine body during work is improved, and the vehicle width 14C is reduced. By narrowing, it is possible to travel in a narrow passage and transport by mini truck.

  FIG. 4 is a diagram showing a part of the left and right traveling devices and the vehicle width changing device. The vehicle width changing device 51 (see FIG. 3) includes hydraulic cylinders 16 (hereinafter referred to as vehicle width changing cylinders) that are attached to the left and right side frames 12A and 12B and can be expanded and contracted in the vehicle width direction. The pressure oil supply / discharge port of the cylinder 16 is connected to the center joint 17 via a hydraulic hose, and further connected to the vehicle width change control valve 42a (see FIG. 5) of the control valve unit 42 via the center joint 17. . The vehicle width changing device 51 includes a guide mechanism that guides the expansion and contraction of the left and right traveling devices 11A and 11B when the vehicle width is changed before and after the vehicle width changing cylinder 16, but is not shown in FIG. Yes.

  FIG. 5 is a view showing the control valve unit and the center joint. The control valve unit 42 has a plurality of control valves that control the direction and flow rate of pressure oil supplied from a hydraulic pump (not shown) to each of a plurality of hydraulic actuators including the traveling motor 13A (see FIG. 2). The vehicle width change control valve 42a is one of them. The pressure oil supply / discharge port of the vehicle width change control valve 42a is connected to the center joint 17 via a hydraulic hose and further connected to the vehicle width change cylinder 16 via the hydraulic hose shown in FIG. Further, the vehicle width change control valve 42a is a machine-operated switching valve, and its operation portion is connected to the cable 44 via link mechanisms 43a and 43b. The cable 44 is routed around the revolving structure support structure 50 (see FIG. 1) and is connected to the vehicle width changing operation lever 34 (see FIG. 6 or 7). By operating the vehicle width change operation lever 34, the cable 44 is pushed and pulled, and the vehicle width change control valve 42a is operated to switch the pressure oil supplied to the vehicle width change cylinder 16 (see FIG. 4). The direction and flow rate are controlled, and the vehicle width 14C can be changed.

  6 and 7 are a perspective view and a side view, respectively, of the seat base portion with the exterior cover, the driver's seat, the lever lock device, and the like removed. 6, the seat base 22 is located on the left side of the central seat base portion 22a on which the driver's seat 23 is placed and on the left side of the central seat base portion 22a, and the left seat base on which the left operating lever device 32A is disposed. Part 22b and a right seat base part 22c on the right side of the central seat base part 22a on which the right operating lever device 32B and the blade lifting lever 33 are placed. Each seat base portion 22a, 22b, 22c has a top panel 22a1, 22b1, 22c1 and a front panel 22b2 (only the left side is shown), and the central seat base portion 22a further includes left and right seat base portions 22b. , 22c and left and right side walls 22a3 (only the left side is shown), and the left seat base portion 22b further has a partition wall 22b3 for partitioning the interior back and forth.

  As shown in FIGS. 6 and 7, the vehicle width changing operation lever 34 extends downward through a long hole-shaped lever hole 22b4 formed in the upper surface panel 22b1 of the left seat base portion 22b. It is connected with the rotation part 45b of the link mechanism 45 attached to the partition 22b3 of 22b with the bracket 45a. The link mechanism 45 has an arm portion 45 c formed integrally with the rotating portion 45 b, and the arm portion 45 c is connected to the cable 44. By tilting the vehicle width changing operation lever 34 in the front-rear direction, the cable 44 is pushed and pulled, and the vehicle width changing control valve 42a is switched as described above, whereby the vehicle width 14C is changed.

  8 is a perspective view of the driver's seat portion viewed from the rear left side of the fuselage, FIG. 9 is a top view of the left portion of the driver's seat, and FIG. 10 is an enlarged view of the portion above the lever hole 22b4 of the vehicle width changing operation lever. It is a side view. As shown in FIGS. 8 and 9, the vehicle width changing operation lever 34 is a rear portion of the left operation lever device 32A on the seat base 22 and a front portion of the left pillar 30A (the left operation lever device 32A and the left pillar 30A). Between). As shown in FIG. 10, the vehicle width changing operation lever 34 has a lever portion 34a and a grip portion 34b attached to the tip of the lever portion 34a. The lever portion 34a is shown in FIGS. As shown, it is attached to the rotating portion 45 b of the link mechanism 45 and can be tilted in the front-rear direction with respect to the seat base 22. The lever portion 34a has a lever main body 34a1 and a tip end portion 34a2 to which a grip portion 34b is attached, and the tip end portion 34a2 is bent backward with respect to the lever main body 34a1. In addition, the broken line part in FIG. 10 has shown the hand of the operator who gripped the grip part 34b. Since the distal end portion 34a2 is bent rearward with respect to the lever main body 34a1, as can be seen with reference to FIG. 9, when the vehicle width changing operation lever 34 is tilted forward, the operator holding the grip portion 34b. The hand does not jump out of the turning radius R and does not interfere with the front left operation lever device 32A. Further, since the vehicle width changing operation lever 34 is arranged to be shifted to the left side from the left pillar 30A, the operator's hand holding the grip portion 34b turns when the vehicle width changing operation lever 34 is tilted backward. It does not jump out from the radius R and does not interfere with the rear left pillar 30A.

  FIG. 11 is a perspective view of the lever lock device. As shown in FIG. 11, the lever lock device 35 is configured with a step hinge, a mounting plate 35 a fixed to the side edge of the lever hole 22 b 4 (see FIG. 6) with a bolt or the like, and the mounting plate 35 a It has a movable plate 35c attached so as to be rotatable between a lying position and a standing position via a hinge 35b. On the side edge side of the movable plate 35c, a notch recess 35d for sandwiching the lever portion 34a (see FIG. 10) of the vehicle width changing operation lever 34 is formed. A bent plate-like member 35e (gripping portion) is welded to the side edge portion side of the movable plate 35c in which the cutout recess 35d is formed. A flexible plate-like seal member 35f is attached to the surface of the movable plate 35c on the side closing the lever hole 22b4.

  FIG. 12 is a perspective view of the vehicle width change operation lever and the lever lock device in a state where the vehicle width change operation lever is locked. As shown in FIG. 12, the movable plate 35c is rotated to the position (falling position) where the lever hole 22b4 is closed, and the lever portion 34a of the vehicle width changing operation lever 34 is sandwiched by the notch recess 35d of the movable plate 35c. Thus, the vehicle width changing operation lever 34 can be locked. At this time, the lever hole 22b4 (see FIG. 12) can be blocked by the movable plate 35c, and further, the gap between the movable plate 35c and the outer peripheral portion of the lever hole 22b4 can be blocked by the seal member 35f. Here, since the lever hole 22b4 communicates with the engine compartment, it is desirable to use a member having excellent heat resistance such as a rubber plate as the seal member 35f.

  FIG. 13 is a perspective view of the vehicle width change operation lever and the lever lock device with the vehicle width change operation lever unlocked. As shown in FIG. 13, the movable plate 35c is rotated to a position (standing position) where the lever hole 22b4 is opened, and the notch recess 35d (see FIG. 12) is detached from the vehicle width changing operation lever 34. Then, the lock of the vehicle width changing operation lever 34 is released.

~effect~
The effects obtained by the hydraulic excavator according to the present embodiment configured as described above will be described in comparison with a hydraulic excavator according to the prior art.

  First, the hydraulic excavator according to the present embodiment is, for example, a rear micro-swivel machine. Unlike a standard machine with a large rear-end radius, the rear micro-swivel machine has limited space for laying out equipment, a fuel tank, and an operation. The oil tank is located on the front right side of the fuselage. Therefore, the visibility of the foot part (crawler) from the right side of the driver's seat is not good.

  In such a rear ultra-small turning machine, if the blade lifting lever on the right side of the driver's seat has a function as a vehicle width changing operation lever like a hydraulic excavator currently in practical use, the operator changes the vehicle width. It is difficult to visually check the position of the crawler while operating the operation lever, and it takes time to adjust the vehicle width.

  On the other hand, in Patent Document 1, a vehicle width changing operation lever is provided on the front surface of the seat base below the driver's seat. FIG. 14 is a diagram showing a hydraulic excavator in which the technique of Patent Document 1 is applied to a rear ultra-small turning machine and a vehicle width changing operation lever is arranged at the lower part of the driver's seat together with an operator seated on the driver's seat. In the hydraulic excavator shown in FIG. 14, the vehicle width changing operation lever 34 is disposed on the front side surface of the seat base 22 below the driver seat 23, so that the operator bends forward when operating the vehicle width changing operation lever 34. In this case as well, it is difficult to visually confirm the positions of the left and right crawlers 14A and 14B, and it takes time to adjust the vehicle width. In addition, when a dedicated vehicle width change operation lever is provided on a small hydraulic excavator with limited equipment mounting space as in Patent Document 1, an error occurs during normal work that does not require operation of the vehicle width change operation lever. Therefore, a part of the operator's body (in the case of Patent Document 1, the operator's foot) may come into contact with the vehicle width changing operation lever, and the vehicle width may be changed against the operator's intention.

  FIG. 15 is a view showing the hydraulic excavator according to the present embodiment together with the operator seated on the driver's seat. In the hydraulic excavator according to the present embodiment, the vehicle width changing operation lever 34 is disposed on the left side portion of the driver's seat 23 of the revolving structure support structure 50. Even when the visibility of the crawlers 14A and 14B) is limited, the operator can visually check the positions of the left and right crawlers 14A and 14B by looking at the left side of the driver's seat 23 of the revolving structure support structure 50 with good visibility. The vehicle width changing operation lever 34 can be operated while checking, and the adjustment of the vehicle width 14C is facilitated.

  In addition, by providing a lever lock device 35 for locking the vehicle width change operation lever 34, the lever lock device 35 can be used to move the vehicle width change operation lever 34 during normal work that does not require operation of the vehicle width change operation lever 34. By locking, it is possible to prevent erroneous operation of the vehicle width changing operation lever 34.

  Further, since the lever lock device 35 includes the grip portion 35e provided to rise from the movable plate 35c, the movable plate 35c can be rotated through the grip portion 35e, and the operator can change the vehicle width. The lock operation and the release operation of the operation lever 34 can be performed smoothly.

  Further, when the vehicle width changing operation lever 34 is locked, the lever hole 22b4 can be closed by the movable plate 35c, so that hot air in the engine chamber is prevented from being ejected from the lever hole 22b4, and rainwater or the like is prevented from being emitted from the lever hole 22b4. Intrusion into the engine compartment can be prevented. As a result, the living environment of the driver's seat 23 can be kept good, and the operating environment of the devices installed in the engine compartment can be kept good.

  Furthermore, when the vehicle width changing operation lever 34 is locked, the gap between the movable plate 35c and the outer peripheral portion of the lever hole 22b4 can be closed with the seal member 35f, and the above effects can be further enhanced.

~ Modification ~
The present invention is not limited to the above-described embodiments, and the following modifications are possible.

  1. In the present embodiment, the gripping portion 35e of the movable plate 35c is formed by welding the folded plate-like member. However, for example, as shown in FIG. 16, the gripping portion 35Ae is bent by bending the side edge portion of the movable plate 35Ac. Alternatively, the grip portion 35Be may be formed by welding a bent rod-shaped member to the movable plate 35c as shown in FIG.

  2. In the present embodiment, the mounting plate 35a and the movable plate 35c are connected to form a stepped hinge, and the sealing member 35f is provided on the movable plate 35c. However, the mounting plate 35a and the movable plate 35c are connected to a flat hinge. It is good also as a structure which connects so that the sealing member 35f may not be provided in the movable plate 35c.

  3. In the present embodiment, the vehicle width changing operation lever 34 is disposed on the left seat base portion 22b on which the left operation lever device 32A is disposed. For example, the left and right operation lever devices 32A and 32B are disposed on the front side of the floor panel 24. In the case of a hydraulic excavator that is disposed in the portion and does not have the left seat base portion 22b, the excavator may be disposed in the left portion of the driver's seat 23 of another structure that constitutes the revolving structure support structure 50.

  4). In the present embodiment, the two-column canopy 30 is provided. However, for example, a one-column or three-column canopy may be provided.

  5. In the present embodiment, as shown in FIGS. 5, 6, and 7, the operation portion of the vehicle width change control valve 42 a and the vehicle width change operation lever 34 are connected via the link mechanisms 43 a and 43 b and the cable 44. However, for example, when the distance between the control valve unit 42 and the vehicle width changing operation lever 34 is small, it may be configured to connect only via the link mechanism.

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper turning body 10 Center frame 11A Left traveling apparatus 11B Right traveling apparatus 12A Left side frame 12B Right side frame 13A Left traveling motor 14A Left crawler 14B Right crawler 14C Vehicle width 15 Blade lifting cylinder 16 Vehicle width changing cylinder 17 Center joint 20 Swivel frame 21 Counterweight 22 Seat base 22a Center seat base portion 22b Left seat base portion 22c Right seat base portion 22a1, 22b1, 22c1 Top panel 22b2 Left front panel 22a3 Side wall 22b3 Partition 22b4 Lever hole 23 Driver's seat 24 Floor Panel 25 Tank cover 26 Exterior cover 27 Support bracket 30 Canopy 30A Left pillar 30B Right pillar 30C Roof 31 Travel lever / pedal device 32 Left operation lever device 32B Right operation lever device 33 Blade lifting lever 34 Vehicle width change operation lever 34a Lever portion 34a1 Lever body 34a2 Tip portion 34b Grip portions 35, 35A, 35B Lever lock device 35a Mounting plate 35b Hinge 35c, 35Ac Movable plate 35d Notch recess 35e, 35Ae, 35Be Grasping part 35f Seal member 40 Turning device 41 Engine 42 Control valve unit 42a Vehicle width change control valve 43a, 43b Link mechanism 44 Cable 45 Link mechanism 45a Bracket 45b Turning part 45c Arm part 50 Turning Body support structure 51 Vehicle width changing device R Turning radius

Claims (3)

A lower traveling body that can change the interval between the left and right crawler traveling devices, and an upper revolving body that is turnably mounted on the lower traveling body,
The upper revolving structure includes a revolving frame that forms a support structure, a counterweight provided at a rear portion of the revolving frame, and is supported by the revolving frame and provided on the front side of the counterweight, together with the revolving frame. A seat base constituting a revolving structure support structure, a driver seat installed on the seat base, a floor panel positioned on the front side of the seat base and the driver seat, and forming an access passage for an operator, and the seat the operation have a respectively arranged left operating lever device and the right operating lever device in the left part and right part of the seat on the base, the seat base portion includes an engine and a hydraulic pump are mounted on the rotating frame A fuel tank and a hydraulic oil tank at the front right side of the swivel frame that also serves as an engine cover that covers the equipment Are arranged, in the fabricated construction machine as rear ultraminiature rotary machine,
A hydraulic vehicle width change cylinder that is arranged between the left and right crawler type travel devices and changes the interval between the left and right crawler type travel devices by controlling the supply and discharge of pressure oil by a vehicle width change control valve. When,
A vehicle width change operation lever that is disposed on a left side portion of the driver's seat of the revolving structure support structure and operates the vehicle width change control valve;
A lever locking device for locking the vehicle width changing operation lever in a neutral position;
The seat base includes a central seat base portion on which the driver's seat is placed, a left seat base portion that is positioned on the left side of the central seat base portion and the left operating lever device is disposed, and the central seat base portion A right seat base portion on which the right operating lever device is disposed, and an outer periphery of the left seat base portion is covered with an exterior cover,
The vehicle width changing operation lever is disposed at a rear side portion of the left operation lever device of the left seat base portion, and is configured to extend downward through a long hole formed in an upper surface panel of the left seat base portion. ,
The vehicle width changing operation lever has a lever portion attached to the revolving structure support structure so as to be tiltable, and a grip portion attached to an upper end of the lever portion ,
The lever lock device has a movable plate attached to the upper panel via a hinge so as to be rotatable between a lying position and an upright position, and the movable plate has a side edge portion opposite to the hinge. A notch is formed in the
When the movable plate is in the lying position, it locks the lever portion by closing the lever hole and sandwiching the lever portion in the notch recess, and when the movable plate is in the standing position, the lever hole A construction machine configured to release the lock and to release the lock of the lever portion by releasing the notch recess from the lever portion.
The construction machine according to claim 1,
The lever lock device includes a gripping portion provided to rise from the movable plate on the side edge portion side where the notch recess of the movable plate is formed. In the construction machine according to claim 1 or 2,
The lever lock device includes a flexible plate-like seal member attached to a surface of the movable plate on a side closing the lever hole.

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