Locking mechanism

Abstract

To provide a lock mechanism and a construction machine capable of simplifying a mechanism around a plurality of operation levers and capable of locking a plurality of operation levers at the same time.SOLUTION: A lock mechanism 30 locking an operation lever of a construction machine 1 comprises: a blade operation lever 22 (a first operation lever), which is an operation lever; a first rotation shaft 26 pivotally supporting the blade operation lever 22 so as to be rotatable; a first engagement portion 31 provided on the outer peripheral face of the first rotation shaft 26; and a first restriction portion 33 constituted so as to be engageable with the first engagement portion 31. The first restriction portion 33 restricts an operation of the blade operation lever 22 when engaged with the first engagement portion 31 and allows an operation of the blade operation lever 22 when not engaged with the first engagement portion 31.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a lock mechanism that locks an operating lever of a construction machine and a construction machine equipped with a lock mechanism. [Background technology]

[0002] Construction machines such as hydraulic excavators are equipped with various operating levers so that an operator can operate a traveling body such as a pair of crawlers for traveling and rotating, and a working machine having a bucket for performing excavation work, etc. Some construction machines also have a mechanism for restricting the movement (operation) of the operating levers in order to increase safety.

[0003] For example, the construction machine disclosed in Patent Document 1 is provided with a travel lever for traveling the vehicle, a work operation device for rotating the upper rotating body and for raising and lowering the work equipment, and left and right lock levers on the frame of a lever stand. In addition, the vehicle is provided with a lever engagement member for stopping the travel lever when the lock lever is in the locked position, and a work stop device for stopping the work operation device when the lock lever is in the locked position. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4699869 Summary of the Invention [Problem to be solved by the invention]

[0005] In the conventional technology, such as the construction machine of Patent Document 1, in order to stop (lock) the operating levers of the travel lever and the work operating device, a stop mechanism (locking mechanism) such as a lever engagement member and a work stop device is provided, so that the mechanism around the travel lever and the work operating device becomes complicated. Therefore, a problem occurs in that the layout constraints become large when arranging the lever engagement member and the work stop device and arranging other peripheral members around the travel lever and the work operating device. Therefore, it is difficult in terms of layout to apply a mechanical mechanism for stopping the travel lever while applying a mechanical mechanism for stopping the work operating device such as the blade lever and the work equipment lever. However, if a hydraulic or electric locking mechanism is applied to lock the operating lever, the manufacturing cost increases compared to a mechanical locking mechanism. Therefore, there is a demand for simplifying the mechanism around multiple operating levers such as the travel lever and the work operating device, and for enabling the multiple operating levers to be stopped (locked) simultaneously.

[0006] An object of the present invention is to provide a lock mechanism and a construction machine which simplify the mechanism around a plurality of operating levers and are capable of locking a plurality of operating levers simultaneously. [Means for solving the problem]

[0007] In order to solve the above problems, the locking mechanism of the present invention is a locking mechanism for locking an operating lever of a construction machine, and comprises a first operating lever which is the operating lever, a first pivot shaft which rotatably supports the first operating lever, a first engaging portion provided on the outer peripheral surface of the first pivot shaft, and a first regulating portion configured to be engageable with the first engaging portion, wherein the first regulating portion regulates the operation of the first operating lever when engaged with the first engaging portion, and allows the operation of the first operating lever when disengaged from the first engaging portion.

[0008] The construction machine of the present invention is characterized by including the above-mentioned locking mechanism. Effect of the Invention

[0009] According to the present invention, it is possible to provide a lock mechanism and a construction machine which simplify the mechanism around a plurality of operating levers and which are capable of locking a plurality of operating levers simultaneously. [Brief description of the drawings]

[0010] [Figure 1] 1 is a perspective view showing an example of a construction machine according to an embodiment of the present invention. [Diagram 2] 1 is a perspective view showing an operation device for a construction machine according to an embodiment of the present invention, from the rear. [Diagram 3] FIG. 2 is a perspective view showing a locking mechanism of the construction machine according to the embodiment of the present invention, viewed from the rear. [Figure 4] FIG. 2 is an enlarged perspective view showing a locking mechanism of the construction machine according to the embodiment of the present invention, viewed from the rear. [Diagram 5] FIG. 2 is an enlarged perspective view showing a locking mechanism of the construction machine according to the embodiment of the present invention, as viewed from the front. [Figure 6] FIG. 2 is an enlarged perspective view showing a locking mechanism of the construction machine according to the embodiment of the present invention, as viewed from the front. [Figure 7] FIG. 11 is an enlarged perspective view showing, from the front, another example of a locking mechanism for a construction machine according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] A construction machine 1 according to an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a perspective view showing the construction machine 1 according to the embodiment.

[0012] The construction machine 1 is used, for example, at construction sites, demolition sites, mines, etc., and performs work such as civil engineering work and building construction work in response to operation by an operator. In this embodiment, the construction machine 1 is configured as a hydraulic excavator that performs work such as excavating earth and sand. The construction machine 1 is configured as a work vehicle that includes a lower traveling body 2, an upper rotating body 3, and a working machine 4, and in which the upper rotating body 3 and the working machine 4 are rotatably provided above the lower traveling body 2.

[0013] The lower traveling body 2 is equipped with a pair of left and right crawlers 10, and a frame device 11 that supports each crawler 10. The pair of crawlers 10 are driven by power from an engine 14 of the upper rotating body 3 to cause the construction machine 1 to travel. The frame device 11 supports the upper rotating body 3 so that it can rotate, and supports the pair of crawlers 10 on both the left and right sides. In addition, a blade 12 that functions as a blade is attached to the frame device 11 via a blade arm 13 on the lower traveling body 2, and is configured to rotate up and down by a blade cylinder 12a.

[0014] The upper rotating body 3 has an engine 14 therein, and also has a driver's seat 15 for an operator to sit in, an operation device 16 for the operator to operate, etc. The operation device 16 receives operations for the travel of the construction machine 1 and the rotation of the upper rotating body 3, and operations for the work of the work implement 4, etc. The details of the operation device 16 will be described later.

[0015] The work equipment 4 performs various tasks such as excavating earth and sand in response to operation by an operator. The work equipment 4 is attached to the upper rotating body 3, and is composed of a boom 17, an arm 18, and a bucket 19 for excavation work. The construction machine 1 drives the work equipment 4 by hydraulic power of hydraulic oil, and is equipped with hydraulic actuators 17a, 18a, 19a that drive the boom 17, the arm 18, and the bucket 19. The construction machine 1 utilizes power generated by the engine 14 to supply hydraulic oil from a hydraulic tank (not shown) to the hydraulic actuators 17a, 18a, 19a by a hydraulic pump (not shown), and drives the hydraulic actuators 17a, 18a, 19a using the hydraulic oil pressurized by the hydraulic pump as a power transmission medium.

[0016] Boom 17 is provided rotatably by a hydraulically driven boom cylinder 17a relative to a machine body consisting of lower traveling body 2 and upper rotating body 3. For example, boom 17 has a base end near the bottom of upper rotating body 3, extends with the base end as a fulcrum, and is configured to rotate up and down.

[0017] The arm 18 is attached to the tip of the boom 17 and is provided rotatably by an arm cylinder 18a that is hydraulically driven relative to the boom 17. For example, the arm 18 has a base end near the tip of the boom 17, extends with the base end as a fulcrum, and is configured to rotate up and down.

[0018] Bucket 19 is attached to the tip of arm 18 and is provided so as to be rotatable up and down by a bucket cylinder 19a that is hydraulically driven relative to arm 18. For example, bucket 19 has a base end near the tip of arm 18 and is configured to rotate up and down or back and forth with the base end as a fulcrum.

[0019] Next, the operation device 16 will be described. As shown in Fig. 2, the operation device 16 includes, as operation levers operated by the operator, a pair of left and right travel operation levers 20 (second operation levers) that operate the travel of the lower traveling body 2, a pair of left and right work operation levers 21 (third operation levers) that operate the work of the work machine 4, a blade operation lever 22 (first operation lever) that operates the elevation and lowering of the blade 12, and a cut-off lever 23 (regulation lever) that locks (regulates) the operation (operation) of each operation lever.

[0020] As shown in Figures 3 to 6, the travel operation lever 20, the work operation lever 21, the blade operation lever 22 and the cut-off lever 23 are operably attached to an operation frame 24 fixed to the upper rotating body 3. Note that Figures 4 to 5 mainly show mechanisms related to the periphery of the travel operation lever 20 and the blade operation lever 22, and omit the mechanism related to the work operation lever 21. Also, Figure 6 mainly shows mechanisms related to the periphery of the work operation lever 21, and omits the mechanism related to the travel operation lever 20 and the blade operation lever 22.

[0021] A first rotating shaft 26 having a rotation axis direction extending in the left-right direction and a pair of left-right second rotating shafts 27 are supported by a pair of left and right operation frames 24 that form a support structure for the operation device 16. For example, the first rotating shaft 26 is formed in a rod shape and attached to the rear of the operation frame 24, and the second rotating shaft 27 is formed in a cylindrical shape and fitted onto the first rotating shaft 26. That is, the second rotating shaft 27 is provided coaxially with the first rotating shaft 26 and can rotate along the outer circumferential surface of the first rotating shaft 26, and the first rotating shaft 26 and the second rotating shaft 27 can rotate independently of each other. In addition, the pair of left and right second rotating shafts 27 are arranged at a distance from each other in the center in the left-right direction and can rotate independently of each other with respect to the first rotating shaft 26.

[0022] A beam member 25 extending in the left-right direction is installed on the operation frame 24 between the first rotation shaft 26 (second rotation shaft 27) and the regulating shaft 29 in the front-rear direction. The beam member 25 is formed in a flat plate shape and has a first mounting portion 25a for mounting a part of the locking mechanism 30 at the upper center in the left-right direction, and a second mounting portion 25b for mounting a part of the locking mechanism 30 at the lower center. The beam member 25 has left and right mounting holes 25c on both the left and right sides of the first mounting portion 25a for mounting left and right tilting shafts 28 that support the left and right work operation levers 21, respectively.

[0023] The operating device 16 also includes a lock mechanism 30 that locks (restricts) the movement (operation) of each operating lever (travel operating lever 20 , work operating lever 21 , blade operating lever 22 ) in response to the operation of the cutoff lever 23 .

[0024] The travel operation lever 20 is connected to a control valve (not shown) and is configured to control the control valve in response to the operation of the travel operation lever 20 to operate the travel of the lower traveling body 2. The travel operation lever 20 is fixed to the approximate center in the left-right direction of the second rotating shaft 27 so as to extend upward from the second rotating shaft 27, and can be tilted forward and backward by rotating together with the second rotating shaft 27. The pair of left and right travel operation levers 20 are arranged at a distance from each other in the center in the left-right direction. The drive of the left crawler 10 is operated by operating the left travel operation lever 20, and the drive of the right crawler 10 is operated by operating the right travel operation lever 20. In addition, the crawler 10 is driven in the forward direction by tilting the travel operation lever 20 forward, the crawler 10 is driven in the backward direction by tilting the travel operation lever 20 backward, and the drive of the crawler 10 is stopped by placing the travel operation lever 20 in the neutral position.

[0025] The work operation lever 21 is connected to a control valve (not shown) and is configured to control the control valve in response to the operation of the work operation lever 21 to operate the rotation of the upper rotating body 3 and the operation of the work implement 4 (boom cylinder 17a, arm cylinder 18a, bucket cylinder 19a). The work operation lever 21 is attached to a tilting shaft 28 that is tiltable relative to the beam member 25. The tilting shaft 28 has a lower portion inserted into a mounting hole 25c of the beam member 25, has a tilting portion at its midpoint, and is tiltable in multiple directions including forward, backward, left and right with respect to the stationary position, with the position where the axial direction extends in a predetermined stationary direction (for example, the vertical direction), being its stationary position. For example, the work operation lever 21 is disposed forward of the first rotating shaft 26 and the second rotating shaft 27. The work operation lever 21 is fixed to the tilting shaft 28 so as to extend upward from the tilting shaft 28, and is tiltable in multiple directions by tilting together with the tilting shaft 28. By tilting each work operation lever 21, the rotation of the upper rotating body 3 and the rotation of the boom 17, arm 18 and bucket 19 of the work implement 4 are controlled.

[0026] The blade operating lever 22 is connected to a control valve (not shown) and is configured to control the control valve in response to operation of the blade operating lever 22 to operate the operation of the blade 12 (blade cylinder 12a). The blade operating lever 22 is fixed to the first rotating shaft 26 so as to extend upward from an end (e.g., the right end) of the first rotating shaft 26. The blade operating lever 22 is tiltable back and forth around the first rotating shaft 26 as a support shaft, and tilting the blade operating lever 22 rotates the first rotating shaft 26. Tilting the blade operating lever 22 controls the elevation and lowering of the blade 12.

[0027] The cutoff lever 23 is a regulating lever that regulates the operation (operation) of each operating lever, and is attached to a regulating shaft 29 that is rotatably provided with respect to the operating frame 24. For example, the regulating shaft 29 is formed in a rod shape, is disposed forward of the tilting shaft 28, and is journaled on the front part of the operating frame 24 so as to have a rotation axis direction extending in the left-right direction. A third mounting part 29a for mounting a first connecting member 39 or a ball joint 40 described later is provided at a middle part of the regulating shaft 29 in the left-right direction. The cutoff lever 23 is fixed to the regulating shaft 29 so as to extend upward from an end (for example, the left end) of the regulating shaft 29 and then bend backward. The cutoff lever 23 is tiltable forward and backward with the regulating shaft 29 as a support shaft, and the regulating shaft 29 is rotated by tilting the cutoff lever 23.

[0028] The locking mechanism 30 has a locking portion for locking (restricting) the movement (operation) of each operating lever. For example, the locking mechanism 30 has a first locking portion 31 for restricting the movement of the blade operating lever 22, a pair of left and right second locking portions 32 for restricting the movement of the pair of left and right travel operating levers 20, a first restricting portion 33 engageable with the first locking portion 31 and the second locking portion 32, and a pair of left and right second restricting portions 34 for restricting the movement of the pair of left and right work operating levers 21.

[0029] The first engagement portion 31 is positioned between the pair of left and right second pivot shafts 27 near the center in the left-right direction, and is formed in a cubic shape protruding from the outer circumferential surface of the first pivot shaft 26, and is positioned, for example, protruding upward.

[0030] The second locking portions 32 are formed to protrude toward the center in the left-right direction from each of the pair of left and right travel control levers 20. The pair of left and right second locking portions 32 are arranged to be at the same height (position) in the up-down direction when the pair of left and right travel control levers 20 are in a stationary state, and are also arranged with a small gap in the center in the left-right direction.

[0031] The first restricting portion 33 is attached to the operation frame 24 so as to be able to swing, and is tiltable about a predetermined swing shaft 35 as a support shaft. The first restricting portion 33 is disposed between the first and second rotating shafts 26 and 27 and the restricting shaft 29 in the front-rear direction, and is disposed in a position corresponding to the approximate center in the left-right direction and between the pair of left and right travel operation levers 20. The swing shaft 35 is journaled on the first mounting portion 25a of the beam member 25 so as to have a rotation axis direction extending in the left-right direction.

[0032] The first restricting portion 33 is attached in a state of extending in a direction (front-rear direction) perpendicular to the axial direction of the first rotating shaft 26, and acts on the first rotating shaft 26. For example, the first restricting portion 33 extends rearward from the swing shaft 35, i.e., toward the first rotating shaft 26 and the second rotating shaft 27, and has a first locked portion 36 branched downward and a second locked portion 37 branched upward. The first restricting portion 33 also has a connecting portion 38 extending forward from the swing shaft 35, i.e., toward the restricting shaft 29. The first locked portion 36 and the second locked portion 37, and the connecting portion 38 are provided at different positions in the axial direction of the swing shaft 35. The first locked portion 36 and the second locked portion 37, and the connecting portion 38 are capable of swinging like a seesaw with the swing shaft 35 as a pivot.

[0033] The first locked portion 36 has a recess (key-shaped recess) on its underside so as to be engageable with the first locking portion 31, and the second locked portion 37 has a recess (key-shaped recess) on its underside so as to be engageable with the second locking portion 32. The left-right width of the second locked portion 37 is smaller than the distance between the pair of left-right travel control levers 20 and larger than the distance between the pair of left-right second locking portions 32. The vertical distance between the first locked portion 36 and the second locked portion 37 is the same as the vertical distance between the first locking portion 31 and the second locking portion 32.

[0034] The first locked portion 36 and the second locked portion 37 of the first restricting portion 33 simultaneously swing downward to engage with the first locking portion 31 and the second locking portion 32, and the first restricting portion 33 is in an engaged state. On the other hand, the first locked portion 36 and the second locked portion 37 of the first restricting portion 33 simultaneously swing upward to disengage from the first locking portion 31 and the second locking portion 32, and the first restricting portion 33 is in a disengaged state.

[0035] The connecting portion 38 of the first regulating portion 33 is connected to the third mounting portion 29a of the regulating shaft 29 via a first connecting member 39. The first connecting member 39 transmits the operation of the cutoff lever 23 to the first regulating portion 33, and moves up and down in response to the rotation of the regulating shaft 29 to swing the connecting portion 38 in the up and down direction, thereby swinging the first regulating portion 33. The first connecting member 39 is configured to have a spherical joint 40 (e.g., a universal joint) connected to the connecting portion 38 and / or the regulating shaft 29, and it is possible to arrange the connecting portion 38 and the regulating shaft 29 without restricting them. The upper spherical joint 40 is journaled on the connecting portion 38, and the lower spherical joint 40 is journaled on the third mounting portion 29a of the regulating shaft 29.

[0036] Further, a biasing member 41 is attached to the first connecting member 39 between the operation frame 24, and for example, one end of the biasing member 41 is attached to the second attachment portion 25b of the beam member 25, and the other end of the biasing member 41 is attached to the third attachment portion 29a of the regulating shaft 29. The biasing member 41 biases the first connecting member 39 with a predetermined biasing force so as to hold the first regulating portion 33 in a predetermined state (for example, an engaged state and a disengaged state with the first locking portion 31). For example, the biasing member 41 is formed of a spring, and is switched between a first biasing state in which the first regulating portion 33 is biased to an engaged state with the first locking portion 31, and a second biasing state in which the first regulating portion 33 is biased to a disengaged state with the first locking portion 31. In other words, when a force is applied in one direction to the biasing member 41 in the first biasing state, the biasing member 41 switches to the second biasing state, and when a force is applied in the other direction to the biasing member 41 in the second biasing state, the biasing member 41 switches to the first biasing state.

[0037] The second restricting parts 34 are attached to the operation frame 24 so as to be operable, for example, movable in the vertical direction. The pair of left and right second restricting parts 34 are disposed corresponding to the tilting shafts 28 of the pair of left and right work operation levers 21, and are disposed, for example, below the tilting shafts 28. The second restricting parts 34 are formed in a cylindrical shape into which the tilting shafts 28 can be fitted. The second restricting parts 34 move upward to fit the tilting shafts 28, restrict the tilting of the tilting shafts 28, and restrict the tilting of the work operation levers 21, and the second restricting parts 34 are in a restricted state. On the other hand, the second restricting parts 34 move downward to disengage from the tilting shafts 28, and release the restriction on the tilting of the tilting shafts 28, and release the restriction on the tilting of the work operation levers 21, and the second restricting parts 34 are in a restricted state.

[0038] The second restricting portion 34 is connected to the restricting shaft 29 via a second connecting member 42. The second connecting member 42 transmits the operation of the cutoff lever 23 to the second restricting portion 34, and moves up and down in response to the rotation of the restricting shaft 29, thereby moving the second restricting portion 34 in the up and down direction.

[0039] As described above, according to this embodiment, the lock mechanism 30 that locks the operation lever of the construction machine 1 includes the blade operation lever 22 (first operation lever) which is the operation lever, the first rotation shaft 26 that rotatably supports the blade operation lever 22, the first locking portion 31 provided on the outer circumferential surface of the first rotation shaft 26, and the first restricting portion 33 configured to be able to engage with the first locking portion 31. The first restricting portion 33 restricts the operation of the blade operation lever 22 when engaged with the first locking portion 31, and allows the operation of the blade operation lever 22 when not engaged with the first locking portion 31.

[0040] This allows the mechanical locking mechanism 30 to be realized in a small space, and the operation of the blade operating lever 22 can be restricted by the mechanical locking mechanism 30. Therefore, by applying the mechanical locking mechanism 30, manufacturing costs can be reduced compared to hydraulic or electric mechanisms. Note that the locking mechanism 30 of this embodiment is not limited to restricting the blade operating lever 22, and can be applied to restrict any operating lever that rotates a support shaft such as the first rotating shaft 26.

[0041] Furthermore, according to this embodiment, the first restricting portion 33 is disposed above the first rotating shaft .

[0042] This makes it possible to open up the space below the mechanism for operating the blade operating lever 22 (first operating lever), making it possible to place other peripheral devices in this space without any restrictions.

[0043] Furthermore, according to this embodiment, the first restricting portion 33 is configured to be swingable.

[0044] As a result, by swinging the first restricting portion 33, the engagement and disengagement of the first locking portion 31 can be operated within a small range of motion, and the lock mechanism 30 can be made compact.

[0045] In the above embodiment, an example was described in which the first regulating portion 33 is swung relative to the first locking portion 31 to switch between engagement and disengagement, but in other examples, the first regulating portion 33 may be configured to move up and down relative to the first locking portion 31 to switch between engagement and disengagement.

[0046] Furthermore, according to this embodiment, the first restricting portion 33 is attached in a direction perpendicular to the axial direction of the first rotating shaft .

[0047] As a result, the operation of the first regulating portion 33 acts in a manner that intersects with the operation of the first pivot shaft 26 having the first locking portion 31, so that the restricting force of the first regulating portion 33 can be effectively applied to the first locking portion 31.

[0048] Furthermore, according to this embodiment, the lock mechanism 30 includes a second rotating shaft 27 provided coaxially with the first rotating shaft 26, a travel operation lever 20 (second operation lever) rotatably supported on the second rotating shaft 27, and a second locking portion 32 provided on the travel operation lever 20. The first restricting portion 33 is configured to be able to engage with the first locking portion 31 and the second locking portion 32.

[0049] This makes it possible to simultaneously restrict or release the blade operating lever 22 and the travel operating lever 20 by the single first restricting portion 33. Therefore, a mechanism for restricting the blade operating lever 22 and the travel operating lever 20 can be realized in a space-saving manner, and the lock mechanism 30 can be made compact.

[0050] In the above embodiment, an example has been described in which the blade operating lever 22 and the travel operating lever 20 are regulated and released by one first regulating part 33 that operates in response to the rotation of one oscillating shaft 35. However, in other examples, the blade operating lever 22 and the travel operating lever 20 may be configured to be regulated and released by two members that operate in response to the rotation of one oscillating shaft 35.

[0051] Further, according to this embodiment, the lock mechanism 30 includes a cutoff lever 23 (a restricting lever) for controlling the engagement state or disengagement state of the first restricting portion 33 with the first engaging portion 31.

[0052] Thereby, the first restricting portion 33 is operated by operating the cutoff lever 23, and the restriction and release of the restriction of the blade operating lever 22 can be operated.

[0053] Furthermore, according to this embodiment, the lock mechanism 30 includes a first connection member 39 that transmits the operation of the cutoff lever 23 to the first restriction portion 33. The first connection member 39 has a ball joint 40 and transmits the operation of the cutoff lever 23.

[0054] As a result, by using the first connecting member 39, the operation of the cutoff lever 23 can be transmitted to the first regulating portion 33 without restricting the mechanisms for operating the respective operating levers (the travel operating lever 20, the work operating lever 21, and the blade operating lever 22). Furthermore, by using the ball joint 40, the first connecting member 39 can be positioned without any restrictions, for example, the first connecting member 39 can be positioned at an angle. Therefore, it is possible to position the linking portion 38 and the regulating shaft 29 connected by the first connecting member 39 without any restrictions.

[0055] In the above embodiment, an example was described in which the connecting portion 38 and the regulating shaft 29 are connected by a first connecting member 39 having a spherical joint 40, but in other examples, the first connecting member 39 may be composed of other members such as a plate link.

[0056] Further, according to this embodiment, the biasing member 41 is provided to hold the first restricting portion 33 in an engaged state and a disengaged state with respect to the first locking portion 31.

[0057] This allows the biasing member 41 to stably maintain the first regulating portion 33 in an engaged or disengaged state with the first engaging portion 31, and the blade operating lever 22 in a regulated or unregulated state.

[0058] Furthermore, according to this embodiment, the lock mechanism 30 includes the work operation lever 21 (third operation lever) that can be tilted in multiple directions, and a second restricting portion 34 that is configured to be able to restrict the operation of the work operation lever 21.

[0059] As a result, the movement of the work operation lever 21 can be restricted by the mechanical lock mechanism 30, and the manufacturing costs can be reduced compared to hydraulic or electrical mechanisms.

[0060] Furthermore, according to this embodiment, the second regulating part 34 is configured to be operable in the axial direction of the work operation lever 21 in a normal position, and switches between regulating and unregulating the operation of the work operation lever 21 depending on the operation of the second regulating part 34.

[0061] As a result, by configuring the second regulating part 34 to operate in the axial direction of the work operation lever 21, the work operation lever 21 can be switched between regulation and deregulation within a small range of motion, and the locking mechanism 30 can be made smaller.

[0062] In addition, according to this embodiment, the locking mechanism 30 is provided with a cut-off lever 23 (regulating lever) for operating the second regulating part 34 to a regulated or unregulated state for the work operation lever 21, and a second connecting member 42 for transmitting the operation of the cut-off lever 23 to the second regulating part 34.

[0063] As a result, the second restricting portion 34 can be operated by operating the cutoff lever 23, and the work operation lever 21 can be restricted or released from restriction.

[0064] In the above embodiment, an example has been described in which the operating device 16 has the cutoff lever 23 provided around each operating lever (the travel operating lever 20, the work operating lever 21, and the blade operating lever 22). However, the present invention is not limited to this example, and in other embodiments, the cutoff lever 23 may be provided near the driver's seat 15. In this case, the lock mechanism 30 includes a regulating cylinder 45, as shown in FIG. 7, instead of the regulating shaft 29 and the first connecting member 39 as a mechanism for transmitting the operation of the cutoff lever 23 to the first regulating part 33 and the second regulating part 34.

[0065] The regulating cylinder 45 is connected to the swing shaft 35 and configured to apply a rotational force to the swing shaft 35 in response to the operation of the cutoff lever 23. As a result, the regulating cylinder 45 operates in response to the operation of the cutoff lever 23 to rotate the swing shaft 35, thereby causing the first regulating portion 33 to swing relative to the first locking portion 31 and the second locking portion 32.

[0066] In addition, in the above embodiment, an example has been described in which the operating device 16 has the first rotating shaft 26 formed in a cylindrical shape and the second rotating shaft 27 formed in a cylindrical shape arranged around the first rotating shaft 26. However, in other examples, the pair of left and right second rotating shafts 27 may be formed in cylindrical shapes that rotate independently, and the first rotating shaft 26 may be formed in a cylindrical shape arranged around the second rotating shaft 27.

[0067] Furthermore, the present invention can be modified as appropriate within the scope that does not contradict the gist or concept of the invention that can be read from the claims and the entire specification, and the locking mechanism of a construction machine that involves such modifications and a construction machine equipped with a locking mechanism are also included in the technical concept of the present invention. [Explanation of symbols]

[0068] 1. Construction machinery 2 Undercarriage 3. Upper rotating body 4 Work equipment 12 Blades 16 Operating device 20 Travel control lever (second control lever) 21 Work operation lever (third operation lever) 22 Blade operation lever (first operation lever) 23 Cut-off lever (regulating lever) 26 First rotating shaft 27 Second rotating shaft 30 Locking mechanism 31 First locking portion 32 Second locking portion 33 First Regulatory Department 34 Second Regulatory Department 39 First connecting member 40 Ball joint 41 Pressing member 42 Second connecting member

Claims

1. A locking mechanism for locking an operating lever of a construction machine, a first operating lever and a second operating lever which are the operating levers; a first rotation shaft that rotatably supports the first operating lever; A first locking portion provided on an outer circumferential surface of the first rotating shaft; a second engaging portion provided on the second operating lever; a first regulating portion that includes a first engaged portion that engages with the first engaging portion and a second engaged portion that engages with the second engaging portion, which rotate integrally with the first operating lever by operation of a regulating lever, and that regulates the operation of the first operating lever and the second operating lever.

2. A locking mechanism as described in claim 1, characterized in that the first engaging portion is positioned below the second engaging portion and above the first engaging portion.

3. A locking mechanism as described in claim 2, characterized in that the second engaging portion is positioned below the second engaged portion and above the first engaged portion.

4. The second operating lever comprises a pair of left and right operating levers, a pair of left and right second rotation shafts on which the pair of left and right operation levers are pivotally supported and which are arranged to be rotatable with respect to the first rotation shaft; The lock mechanism according to claim 3 , wherein the first engaging portion is disposed between the pair of left and right second rotating shafts.

5. A locking mechanism as described in claim 4, characterized in that the first engaging portion is arranged between the pair of left and right operating levers.

6. A locking mechanism as described in Claim 5, characterized in that the second engaging portion is arranged between the pair of left and right operating levers.

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