Work Machine

Abstract

To improve the operation accuracy of a lock mechanism that locks or unlocks the movement of an operating member.SOLUTION: An operation console provided on a work machine body has a first shaft extending in the width direction of the body, a first operating member supported rotatably relative to the first shaft about the axis of the first shaft, a lock mechanism capable of switching between a locked state of restricting movement of the first operating member and an unlocked state of permitting movement of the first operating member, a second shaft provided parallel to the first shaft, and a second operating member supported rotatably relative to the second shaft about the axis of the second shaft. The lock mechanism includes an engaging portion that rotates integrally with the first operating member, a lock body having an engaged portion, and a drive unit. The second shaft supports the lock body so as to be rotatable relative to the second shaft. The lock body is relatively rotated around the axis of the second shaft by applying a driving force from the drive unit, and is changeable between an engaging position where the engaged portion is engaged with the engaging portion and a disengaged position where the engaged portion is disengaged from the engaging portion.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a working machine such as a backhoe, and more particularly to the structure of a locking mechanism provided in the working machine. [Background technology]

[0002] 2. Description of the Related Art Conventionally, a work machine provided with a locking mechanism that locks or unlocks the movement of an operating member is known. For example, in the work machine disclosed in Patent Document 1, a control platform is provided on the machine body forward of the driver's seat. The control platform is provided with an operating member for operating the traveling device, an operating spindle for supporting the operating member, a locking mechanism, and a locking lever for operating the locking mechanism. The locking mechanism is composed of an engaging portion that rotates integrally with the operating member, a locking body having an engaged portion (locking pin) that restricts the movement of the operating member by engaging with the engaging portion and allows the movement of the operating member by disengaging from the engaging portion, a locking spindle that supports the locking body, and an interlocking mechanism that interlocks the locking lever and the locking body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-199917 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, if the number of components of the locking mechanism and the parts supporting the locking mechanism are large, dimensional errors caused by bending or wear of those components will accumulate, and there is a risk that the movement of the operating member cannot be locked and unlocked properly. In view of the above-mentioned problems, an object of the present invention is to provide a work machine capable of improving the operating accuracy of a locking mechanism that locks or unlocks the movement of an operating member. [Means for solving the problem]

[0005] A working machine according to one aspect of the present invention includes a body and a control platform provided on the body, the control platform including a first shaft extending in a width direction of the body, a first operating member supported around the axis of the first shaft to be rotatable relative to the first shaft, a locking mechanism switchable between a locked state that restricts movement of the first operating member and an unlocked state that allows movement of the first operating member, a second shaft provided parallel to the first shaft, and a second operating member supported around the axis of the second shaft to be rotatable relative to the second shaft. , wherein the locking mechanism includes an engaging portion that rotates integrally with the first operating member, a locking body having an engaged portion that engages with the engaging portion, and a driving portion that applies a driving force to the locking body, wherein the second shaft supports the locking body so that it can rotate relatively to the second shaft, and the locking body is capable of rotating relatively about the axis of the second shaft when a driving force is applied by the driving portion, and is changeable in position between an engaging position where the engaged portion engages with the engaging portion and a disengaging position where the engaged portion disengages from the engaging portion. Effect of the Invention

[0006] According to the above configuration, it is possible to provide a work machine capable of improving the operating accuracy of the locking mechanism that locks or unlocks the movement of the operating member. [Brief description of the drawings]

[0007] [Figure 1] FIG. 2 is a perspective view of the upper part of the control platform from the rear. [Diagram 2] This is a perspective view of the upper part of the internal structure of the cockpit seen from the rear. [Diagram 3] This is a front perspective view of the upper part of the internal structure of the control console. [Figure 4] FIG. 4 is a rear perspective view of the lock mechanism. [Figure 5A] FIG. 4 is a cross-sectional view of the lock mechanism in a locked state. [Figure 5B] FIG. 4 is a cross-sectional view of the lock mechanism in an unlocked state. [Figure 6A]FIG. 11 is a cross-sectional view of a modified locking mechanism in a locked state. [Figure 6B] FIG. 13 is a cross-sectional view of a modified locking mechanism in an unlocked state. [Figure 7] 11A and 11B are diagrams illustrating an example of a locked state of a lock mechanism. [Figure 8] 13A and 13B are diagrams illustrating another example of the lock adjustment structure. [Figure 9] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, the overall configuration of the work machine 1 according to this embodiment will be described. 9 is a schematic side view showing the overall configuration of the work machine 1. In this embodiment, a backhoe, which is a rotating work machine, is exemplified as the work machine 1. The working machine 1 includes a machine body (swivel base) 2, a traveling device 3, and a working device 4. On the machine body 2, a driver's seat 6 is mounted where a driver (operator) is seated.

[0009] In this embodiment, the front side of the driver seated in the driver's seat 6 of the work machine 1 (the direction of arrow A1 in FIG. 9) is described as the front, the rear side of the driver (the direction of arrow A2 in FIG. 9) is described as the rear, the left side of the driver (the direction of arrow B1 in FIG. 1, which will be described later) is described as the left side, and the right side of the driver (the direction of arrow B2 in FIG. 1) is described as the right side. Moreover, the horizontal direction perpendicular to the longitudinal direction K1 will be described as the fuselage width direction (the width direction from left to right of the fuselage 2) K2 (Figure 1). Furthermore, the direction from the center of the fuselage 2 toward the right or left will be described as the fuselage outside. In other words, the fuselage outside is the fuselage width direction K2, and is the direction away from the center of the fuselage 2 to the left or right. The direction opposite to the fuselage outside will be described as the fuselage inside. In other words, the fuselage inside is the fuselage width direction K2, and is the direction approaching the center from the left or right of the fuselage 2.

[0010] The traveling device 3 is a device that supports the machine body 2 so that it can travel. This traveling device 3 has a traveling frame 3A, a first traveling device 3L provided on the left side of the traveling frame 3A, and a second traveling device 3R provided on the right side of the traveling frame 3A. The first traveling device 3L and the second traveling device 3R are crawler-type traveling devices. The first traveling device 3L is driven by a first traveling motor (traveling motor) M1. The second traveling device 3R is driven by a second traveling motor (traveling motor) M2. The first traveling motor M1 and the second traveling motor M2 are configured by hydraulic motors (hydraulic actuators).

[0011] A dozer device 7 is supported on the front lower part of the machine body 2. The dozer device 7 can be raised and lowered (raised and lowered a blade) by extending and contracting a dozer cylinder C1 (hydraulic actuator). The machine body 2 is supported on the traveling frame 3A via a swivel bearing 8 so as to be rotatable about a vertical axis (an axis extending in the up-down direction). The machine body 2 is driven in the swivel direction by a swivel motor M3, which is a hydraulic motor (hydraulic actuator). The machine body 2 has a base plate 9 (hereinafter referred to as a swivel base plate) that swivels about the vertical axis, and a weight 10. The swivel base plate 9 is made of a steel plate or the like, and is connected to the swivel bearing 8. The weight 10 is provided at the rear of the machine body 2.

[0012] A prime mover E1 is built into the rear of the aircraft body 2. The prime mover E1 is a diesel engine. The prime mover E1 may be a gasoline engine, an LPG engine, an electric motor, or a hybrid prime mover having an engine and an electric motor. The prime mover E1 is covered by a bonnet 5. A driver's seat 6 is provided on the bonnet 5.

[0013] The center of the driver's seat 6 in the width direction K2 of the aircraft body substantially coincides with the center of the bonnet 5 in the width direction K2 of the aircraft body. In addition, both sides (left and right sides) of the bonnet 5 in the width direction K2 of the aircraft body protrude from the driver's seat 6 to the outside of the aircraft body. A support bracket 13 is provided at the front of the body 2. The support bracket 13 is installed slightly to the right of the center in the body width direction K2.

[0014] A swing bracket 14 is attached to the support bracket 13 so as to be swingable about a vertical axis. The working device 4 is attached to the swing bracket 14. That is, the working device 4 is supported at the front part of the machine body 2. The work device 4 has a boom 15, an arm 16, and a bucket (work tool) 17. The base of the boom 15 is pivotally attached to the swing bracket 14 so as to be rotatable about a horizontal axis (an axis extending in the machine body width direction K2). This allows the boom 15 to swing up and down. The arm 16 is pivotally attached to the tip side of the boom 15 so as to be rotatable about the horizontal axis. This allows the arm 16 to swing back and forth or up and down.

[0015] The bucket 17 is provided on the tip side of the arm 16 so as to be capable of scooping and dumping operations. The work implement 1 can be equipped with other working tools (hydraulic attachments) that can be driven by a hydraulic actuator, instead of or in addition to the bucket 17. Examples of other working tools include a hydraulic breaker, a hydraulic crusher, an angle broom, an earth auger, a pallet fork, a sweeper, a mower, a snow blower, etc.

[0016] The swing bracket 14 is capable of swinging by extension and retraction of a swing cylinder C2 provided in the machine body 2. The boom 15 is capable of swinging by extension and retraction of a boom cylinder C3. The arm 16 is capable of swinging by extension and retraction of an arm cylinder C4. The bucket 17 is capable of scooping and dumping by extension and retraction of a bucket cylinder (tool cylinder) C5.

[0017] The dozer cylinder C1, the swing cylinder C2, the boom cylinder C3, the arm cylinder C4, and the bucket cylinder C5 are configured by hydraulic cylinders (hydraulic actuators). The boom cylinder C3, the arm cylinder C4, and the bucket cylinder C5 are hydraulic actuators for driving the working device 4. The working machine 1 is equipped with a control device 21 that controls the working machine 1. The control device 21 has a control stand 23. The control stand 23 is provided on the machine body 2, behind the working machine 4 A2 and in front of the driver's seat 6 and the bonnet 5 A1.

[0018] An aisle 22 is provided between the control console 23 and the driver's seat 6 and bonnet 5. The aisle 22 is formed at a predetermined interval on the floor section 24 between the control console 23 and the bonnet 5. The aisle 22 is also open to the left and right of the machine body 2, and is possible to pass through (walk-through) in the machine body width direction K2. Therefore, the driver D can get on and off the work machine 1 from either the left or right side of the work machine 1 via the aisle 22, and can sit in and leave the driver's seat 6.

[0019] The control platform 23 has a cover 26. The cover 26 has a first cover 26F provided on the working device 4 side (front A1 side) and a second cover 26B provided on the driver's seat 6 side (rear A2 side). Fig. 1 is a perspective view of the upper part of the control console 23 as viewed from the rear A2 (the driver's seat 6 side in Fig. 9). As shown in Fig. 1 and Fig. 9, the first cover 26F and the second cover 26B are combined in the front-rear direction K1 to form the housing of the control console 23. The cover 26 covers the internal structure of the control console 23, which will be described later.

[0020] Next, the configuration and structure of the control device 21 will be described. Fig. 2 is a perspective view of the upper part of the internal structure of the control platform 23 as seen from the rear A2 (driver's seat 6 side). Fig. 3 is a perspective view of the upper part of the internal structure of the control platform 23 as seen from the front A1 (working device 4 side) of the machine body 2. Fig. 4 is an enlarged perspective view of the vicinity of the lock mechanism 314 shown in Fig. 2. The internal structure of the control stand 23 includes a support frame 25 that serves as the skeleton of the control stand 23. The first cover 26F and the second cover 26B shown in FIG. 1 etc. are fixed to the support frame 25 by fastening members such as bolts and nuts (not shown).

[0021] As shown in Fig. 2, the support frame 25 has a first vertical member 27 constituting the left portion, a second vertical member 28 constituting the right portion, and a connector 29 connecting these two vertical members 27, 28. The first vertical member 27 and the second vertical member 28 are formed in a plate shape. The first vertical member 27 and the second vertical member 28 are erected on the aircraft body 2 with their respective plate surfaces facing the aircraft body width direction K2. The first vertical member 27 and the second vertical member 28 face each other with a predetermined gap therebetween in the aircraft body width direction K2.

[0022] The connector 29 is provided between the upper parts of the first vertical member 27 and the second vertical member 28. The connector 29 has a first connector 30, a second connector 31, and a third connector 32 (FIG. 2). For convenience, the third connector 32 is not shown in FIGS. 3 and 4. The first connecting member 30 is connected to the upper part of the first vertical member 27. The second connecting member 31 is connected to the upper part of the second vertical member 27. The third connecting member 32 connects the first connecting member 30 and the second connecting member 31 to the upper part of the connecting member 28. The first connecting member 30 and the second connecting member 31 are provided at an interval in the width direction K2 of the aircraft body.

[0023] The first connecting member 30 is disposed on the second vertical member 28 side with respect to the first vertical member 27 and is connected to the first vertical member 27. The first connecting member 30 has a first wall 30a, a second wall 30b, and a third wall 30c. The first wall 30a is fixed along the first vertical member 27. A first bearing tube 69L is disposed below the first wall 30a. The first bearing tube 69L is provided in a penetrating manner in the first vertical member 27 and has an axis extending in the fuselage width direction K2. The second wall 30b extends from the front end of the first wall 30a into the fuselage. A first support tube 68L is provided in a penetrating manner in the second wall 30b. The first support tube 68L has an axis extending in the front-rear direction K1.

[0024] The second connecting member 31 is disposed on the first vertical member 27 side with respect to the second vertical member 28 and is connected to the second vertical member 28. The second connecting member 31 has a first wall 31a, a second wall 31b, and a third wall 31c. The first wall 31a is fixed along the second vertical member 28. As shown in FIG. 3, a second bearing tube 69R is disposed below the first wall 31a. The second bearing tube 69R is provided in a penetrating manner in the second vertical member 28 and has an axis extending in the fuselage width direction K2. The second wall 31b extends from the front end of the first wall 31a into the fuselage. A second support tube 68R is provided in a penetrating manner in the second wall 31b. The second support tube 68R has an axis extending in the front-rear direction K1.

[0025] The third wall 30c of the first connecting member 30 is fixed to the second wall 30b in a manner protruding from the rear surface of the right end portion toward the rear A2. The third wall 31c of the second connecting member 31 is fixed to the second wall 31b in a manner protruding from the rear surface of the left end portion toward the rear A2. An operation support shaft (first shaft) 34 is provided on the upper part of the support frame 25. The operation support shaft 34 has an axis extending in the machine body width direction K2. The operation support shaft 34 is supported by the first vertical member 27 and the second vertical member 28 of the support frame 25 so as to be rotatable about the axis. The operation support shaft 34 has a first shaft portion 34A and a second shaft portion 34B (FIG. 3).

[0026] 2 and other figures, the first shaft portion 34A is inserted through the first bearing sleeve 69L and penetrates the first wall 30a and the third wall 30c of the first connecting member 30 and the third wall 31c of the second connecting member 31. The first shaft portion 34A is supported by the first bearing sleeve 69L and the third walls 30c, 31c so as to be rotatable around the axis of the first bearing sleeve 69L. As shown in Fig. 3, the second shaft portion 34B is disposed to the right B2 and rear A2 of the first shaft portion 34A. The second shaft portion 34B passes through the second bearing sleeve 69R. The second shaft portion 34B is supported by the second bearing sleeve 69R so as to be rotatable about the axis of the second bearing sleeve 69R.

[0027] The first shaft portion 34A and the second shaft portion 34B are disposed at an interval in the machine body width direction K2. As shown in Fig. 4 and other figures, a connecting member 11X is provided between the first shaft portion 34A and the second shaft portion 34B. The first shaft portion 34A and the second shaft portion 34B are connected by the connecting member 11X so as to be rotatable together. As described above, the operation spindle 34 consisting of the first shaft portion 34A and the second shaft portion 34B is supported by the first vertical member 27, the second vertical member 28, the first connecting member 30, and the second connecting member 31. Note that the operation spindle 34 may be composed of a single shaft.

[0028] The connecting member 11X has a first side wall 11A connected to the first shaft portion 34A, a second side wall 11B connected to the second shaft portion 34B, a connecting portion 11C connecting the first side wall 11A and the second side wall 11B, and an extending portion 11D extending upward from the second side wall 11B. The first side wall 11A and the second side wall 11B are arranged at a predetermined interval in the aircraft width direction K2. The connecting portion 11C connects the rear ends of the first side wall 11A and the second side wall 11B to each other.

[0029] The first side wall 11A is provided with a connecting tube 64. The right end of the first shaft portion 34A is inserted into the connecting tube 64 and fixed to the connecting tube 64. This allows the first shaft portion 34A and the first side wall 11A to rotate integrally. The extension portion 11D is provided with contact plates 11E and 11F and a first spring hook portion 70 protruding to the left B1. The first contact plate 11E is disposed in front of the second contact plate 11F in the direction A1. The spring hook portion 70 is made of a pin, and protrudes from the extension portion 11D toward the first shaft portion 34A (left side B1).

[0030] As shown in Fig. 3, a second spring hook portion 72 is provided below the second wall 31b of the second connecting member 31. The second spring hook portion 72 is made of a bent pin and is fixed to a holding plate 100. The holding plate 100 is fixed to a plate surface on the inside side of the aircraft of the second vertical member 28 and protrudes forward A1 from the second vertical member 28. The second spring hook portion 72 protrudes leftward B1 from the holding plate 100, and then bends toward the front A1.

[0031] As shown in FIG. 4 and other figures, a cylindrical body 39L is attached to the radially outer side of the left part of the first shaft portion 34A (between the first wall 30a and the third wall 30c of the first connecting member 30). The cylindrical body 39L is fixed to the first shaft portion 34A by a pin or the like and can rotate integrally with the first shaft portion 34A. A cylindrical spacer 39R is attached to the radially outer side of the right part of the first shaft portion 34A (between the third wall 31c of the second connecting member 31 and the connection member 11X). The spacer 39R is fixed to the first shaft portion 34A by a pin or the like.

[0032] 2, the control platform 23 is provided with a control valve 35. This control valve 35 is an assembly of a plurality of control valves V1 to V10 that control the hydraulic actuators provided in the work machine 1, and is provided between the lower parts of the first vertical member 27 and the second vertical member 28. Each of the control valves V1 to V10 is a direct-acting spool type directional control valve. The spool of each of the control valves V1 to V10 is held in a neutral position by the biasing force of a biasing spring housed in the valve body, and is operated up and down from the neutral position against the biasing force of the biasing spring. The multiple control valves are the first control valve V1 to the tenth control valve V10. The first control valve V1 to the tenth control valve V10 are mechanically operated directional control valves in which the spool can be switched manually.

[0033] The first control valve V1 is a speed change control valve that controls a swash plate angle cylinder (not shown) that changes the tilt angle of the swash plates of the first traveling motor M1 and the second traveling motor M2 (FIG. 9). The second control valve V2 is a swing control valve that controls the swing motor M3 (FIG. 9). The third control valve V3 is an arm control valve that controls the arm cylinder C4 (FIG. 9). The fourth control valve V4 is a first traveling control valve (traveling control valve) that controls the first traveling motor M1 (FIG. 9). The fifth control valve V5 is a dozer control valve that controls the dozer cylinder C1 (FIG. 9). The sixth control valve V6 is a spare control valve that controls a hydraulic attachment. The seventh control valve V7 is a second traveling control valve (traveling control valve) that controls the second traveling motor M2. The eighth control valve V8 is a swing control valve that controls the swing cylinder C2 (FIG. 9). The ninth control valve V9 is a bucket control valve that controls the bucket cylinder C5 (FIG. 9). The tenth control valve V10 is a boom control valve that controls the boom cylinder C3 (FIG. 9). In addition, the third control valve V3, the ninth control valve V9, and the tenth control valve V10 are work control valves that control the hydraulic actuator that drives the work implement 4 (FIG. 9).

[0034] The control platform 23 is provided with an operating shaft 33 (FIG. 2, etc.) and a support shaft 37 (FIG. 5A, etc. described later). The operating shaft (second shaft) 33 is provided below the connector 29 and the operating support shaft 34 and above the control valve 35. The support shaft (third shaft) 37 is provided between the operating support shaft 34 and the operating shaft 33. The operating shaft 33 and the support shaft 37 each have an axis extending in the aircraft width direction K2, and are provided across the first vertical member 27 and the second vertical member 28. That is, the operating shaft 33 and the support shaft 37 are provided in parallel with the operating support shaft 34. The operating shaft 33 is supported by the first vertical member 27 and the second vertical member 28 so as to be rotatable around the axis. The right part of the operating shaft 33 protrudes from the second vertical member 28 to the outside of the aircraft. The support shaft 37 is supported by the first vertical member 27 and the second vertical member 28.

[0035] A first rotating cylinder 38A, a third rotating cylinder 38C, and a fourth rotating cylinder 38D are attached to the radial outside of the operating shaft 33. The third rotating cylinder 38C rotates integrally with the operating shaft 33, and the first rotating cylinder 38A and the fourth rotating cylinder 38D rotate relative to the operating shaft 33. A fifth rotating cylinder 38E is attached to the radial outside of the support shaft 37. A second rotating cylinder 38B is attached to the radial outside of a central portion of the fifth rotating cylinder 38E (see FIG. 5A, etc.).

[0036] As shown in FIG. 2, a first relay piece 91A protrudes rearward A2 from the rear of the first rotating cylinder 38A. The second rotating cylinder 38B has connecting portions 91L and 91R at both left and right ends thereof so as to protrude toward the rear A2. The rear of the fourth rotating cylinder 38D has a third relay piece 91C at its rear so as to protrude toward the rear A2. The fifth rotating cylinder 38E has connecting portions 91P and 91Q at both left and right ends thereof so as to protrude toward the rear A2.

[0037] As shown in FIG. 3, a first arm 39A is provided in front of the first rotating cylinder 38A so as to protrude in the forward direction A1. A second arm 39B is provided in front of the second rotating cylinder 38B so as to protrude in the forward direction A1. A third arm 39C is provided in front of the third rotating cylinder 38C so as to protrude in the forward direction A1. A fourth arm 39D is provided in front of the fourth rotating cylinder 38D so as to protrude in the forward direction A1. A fifth arm 39E is provided in front of the fifth rotating cylinder 38E so as to protrude in the forward direction A1.

[0038] The first rotating cylinder 38A is connected to the spool S2 of the second control valve V2 via an arm 39A and a link 40A. The second rotating cylinder 38B is connected to the spool S3 of the third control valve V3 via an arm 39B and a link 40B. The third rotating cylinder 38C is connected to the spool S5 of the fifth control valve V5 via an arm 39C and a link 40C. The fourth rotating cylinder 38D is connected to the spool S9 of the ninth control valve V9 via an arm 39D and a link 40D. The fifth rotating cylinder 38E is connected to the spool S10 of the tenth control valve V10 via an arm 39E and a link 40E.

[0039] The control platform 23 is provided with a plurality of levers, pedals, and the like for operating the working device 4, the dozer device 7, the traveling device 3 (FIG. 9), and other devices provided on the working machine 1. A dozer lever (second operating member) 66 for operating the dozer device 7 is provided on the right side B2 of the control stand 23. The base of the dozer lever 66 is fixed to the right part of the operating shaft 33. By swinging the dozer lever 66 back and forth, the operating shaft 33 and the third rotating cylinder 38C rotate, and the spool S5 of the fifth control valve V5 is pushed and pulled via the arm 39C and the link 40C. This controls the dozer cylinder C1 to drive the dozer device 7.

[0040] An accelerator lever 67 for controlling the rotation speed of the prime mover E1 is provided on the left side B1 of the control stand 23. A first pedal support portion and a second pedal support portion are provided on the lower portion of the first vertical member 27 (see FIG. 9, reference numerals omitted). The first pedal support portion supports a speed change pedal (not shown) for operating the first control valve V1 (FIG. 2). The second pedal support portion supports an SP pedal (not shown) for operating the sixth control valve V6 (FIG. 2). A third pedal support portion is provided on the lower portion of the second vertical member 28 (not shown). The third pedal support portion supports a swing pedal (not shown) for operating the eighth control valve V8 (FIG. 2).

[0041] As shown in FIG. 1 and other figures, above the control stand 23, an operation member (first operation member) 41 and an operation member (third operation member) 71 are provided. The operating member 41 constitutes a travel lever that operates the traveling device 3 (travel control valve). The operating member 41 is disposed on the upper part of the operation stand 23 and in the center in the width direction K2 of the vehicle body. The operating member 41 includes a first travel lever 41L and a second travel lever 41R. The first travel lever 41L and the second travel lever 41R are disposed side by side in the width direction K2 of the vehicle body. The first travel lever 41L operates the first traveling device 3L, and the second travel lever 41R operates the second traveling device 3R. The first travel lever 41L is located inside the vehicle body of the first operation lever 71L described later. The second travel lever 41R is located inside the vehicle body of the second operation lever 71R described later and to the right B2 of the first travel lever 41L.

[0042] The first travel lever 41L has a lever body 43L having a grip 42L at its tip (upper portion), and a cylindrical first base portion 44L (FIG. 3, etc.) provided at the lower portion of the lever body 43L. The first base 44L is disposed between the first connecting member 30 and the second connecting member 31. The first shaft portion 34A of the operation support shaft 34 is inserted into the first base 44L. That is, the first base 44L is disposed around the periphery of the first shaft portion 34A. The first base 44L is supported so as to be rotatable relative to the first shaft portion 34A about the axis of the first shaft portion 34A. As a result, the first travel lever 41L is supported by the operation support shaft 34 so as to be rotatable about the axis of the operation support shaft 34, and is swingable in the front-rear direction K1.

[0043] As shown in FIG. 3, the first base 44L is provided with a first arm projection 45X made of a plate material that projects forward A1. The first arm projection 45X rotates integrally with the first traveling lever 41L. One end (upper part) of a connecting rod 48L is connected to the first arm projection 45X via a ball joint 49L. The other end (lower part) of the connecting rod 48L is connected to a spool S4 of the fourth control valve V4 via a connecting block 48X. When the first traveling lever 41L is swung back and forth, the first arm projection 45X swings up and down, and the spool S4 of the fourth control valve V4 is pushed and pulled via the connecting rod 48L. This controls the first traveling motor M1 to drive the first traveling device 3L.

[0044] As shown in FIG. 1 etc., the second traveling lever 41R has a lever body 43R having a grip 42R at its tip (upper part), and a cylindrical second base part 44R (FIG. 3 etc.) provided at the base (lower part) of the lever body 43R. The second base 44R is disposed between the first connecting member 30 and the second connecting member 31. The first shaft portion 34A of the operation support shaft 34 is inserted into the second base 44R. That is, the second base 44R is disposed around the periphery of the first shaft portion 34A. The second base 44R is supported so as to be rotatable relative to the first shaft portion 34A around the axis of the first shaft portion 34A. As a result, the second travel lever 41R is supported by the operation support shaft 34 so as to be rotatable around the axis of the operation support shaft 34, and can be swung back and forth.

[0045] As shown in FIG. 3, the second base 44R is provided with a second arm projection 45Y made of a plate material that protrudes forward A1. The second arm projection 45Y is arranged in parallel with the first arm projection 45X in a direction parallel to the axial direction of the operation support shaft 34. The second arm projection 45Y rotates integrally with the second traveling lever 41R. One end (upper part) of the connecting rod 48R is connected to the second arm projection 45Y via a ball joint 49R. The other end (lower part) of the connecting rod 48R is connected to the spool S7 of the seventh control valve V7 via a connecting block 48Y. When the second traveling lever 41R is swung back and forth, the second arm projection 45Y swings up and down, and the spool S7 of the seventh control valve V7 is pushed and pulled via the connecting rod 48R. This controls the second traveling motor M2 to drive the second traveling device 3R.

[0046] The control member 71 is a lever that controls the working device 4 and the machine body 2. The control member 71 includes a first control lever 71L and a second control lever 71R provided to the right B2 of the first control lever 71L. The first control lever 71L and the second control lever 71R are disposed above the control platform 23 and outside the machine body from the operation member 41. More specifically, the first control lever 71L is disposed on the outside machine body side (left side) of the first traveling lever 41L. The second control lever 71R is disposed on the outside machine body side (right side) of the second traveling lever 41R. The machine body 2, the arm 16, the boom 15, and the bucket 17 are operated by the control levers 71L and 71R.

[0047] The first control lever 71L has a grip 78L (Fig. 1) at its tip (upper part). The base (lower part) of the first control lever 71L is supported by the support frame 25 via a first support 77L (Fig. 2) so as to be swingable in any swing direction. The second control lever 71R has a grip 78R (Fig. 1) at its tip (upper part). The base (lower part) of the second control lever 71R is supported by the support frame 25 via a second support 77R (Fig. 2) so as to be swingable in any swing direction. The swing directions of the first control lever 71L and the second control lever 71R are the front-rear direction K1, the aircraft width direction K2, and a diagonal direction between the front-rear direction K1 and the aircraft width direction K2.

[0048] As shown in FIG. 2, the first support 77L disposed below the first control lever 71L has a first bracket 81L and a first lever fixing portion 82L. The first bracket 81L is rotatably supported by the first bearing sleeve 69L via a first pivot (not shown) parallel to the front-rear direction K1. The first lever fixing portion 82L is rotatably supported by the first bracket 81L via a second pivot 80L parallel to the aircraft width direction K2 in a state where it is inserted inside the first bracket 81L. The base of the first control lever 71L is fixed to the upper surface of the first lever fixing portion 82L. A connecting portion 88L is provided on the rear surface of the first lever fixing portion 82L so as to protrude rearward A2.

[0049] With the above-mentioned structure, the first control lever 71L rotates about a first pivot parallel to the first bearing sleeve 69L. The pivot shaft 80L is pivotable in the width direction K2 of the aircraft body and in the front-rear direction K1 about the second pivot shaft 80L. A connecting piece 86L is provided at the left rear of the first bracket 81L so as to protrude to the left B1. The upper end of the first interlocking member 89A is connected to the connecting piece 86L. The lower end of the first interlocking member 89A is connected to the first relay piece 91A. As a result, when the first operation lever 71L is swung in the vehicle width direction K2, the spool S2 of the second control valve V2 is pushed and pulled via the first interlocking member 89A, the first relay piece 91A, the first rotating cylinder 38A, the first arm 39A, the link 40A, and the like. Then, the swing motor M3 is controlled to swing the vehicle 2 left and right.

[0050] The second support 77R disposed below the second control lever 71R has a second bracket 81R and a second lever fixing portion 82R. The second bracket 81R is rotatably supported by the second bearing sleeve 69R via a third pivot (not shown) parallel to the front-rear direction K1. The second lever fixing portion 82R is rotatably supported by the second bracket 81R via a fourth pivot 80R parallel to the aircraft width direction K2 while being inserted inside the second bracket 81R. The base of the second control lever 71R is fixed to the upper surface of the second lever fixing portion 82R. A connecting portion 88R is provided on the rear surface of the second lever fixing portion 82R so as to protrude rearward A2.

[0051] With the above-described structure, the second control lever 71R can swing in the aircraft width direction K2 about a third pivot axis parallel to the second bearing sleeve 69R, and can swing in the front-rear direction K1 about the fourth pivot axis 80R. A connecting piece 86R is provided at the left rear of the second bracket 81R so as to protrude to the left B1. The upper end of a third interlocking member 89C is connected to the connecting piece 86R. The lower end of the third interlocking member 89C is connected to a third relay piece 91C. As a result, when the second control lever 71R is swung in the aircraft width direction K2, the spool S9 of the ninth control valve V9 is pushed or pulled via the third interlocking member 89C, the third relay piece 91C, the fourth rotating cylinder 38D, the fourth arm 39D, the link 40D, and the like. Then, the bucket cylinder C5 is controlled, and the bucket 17 swings up and down.

[0052] An operation switching mechanism 315 is provided below the control levers 71L, 71R. The operation switching mechanism 315 is a mechanism that transmits the swing operation force of the first control lever 71L and the second control lever 71R in the forward / rearward direction K1 to the control valves V3, V10, and switches the operation targets of the first control lever 71L and the second control lever 71R, and is also called a TPSS (Two Pattern Selective System).

[0053] The operation switching mechanism 315 includes a second rotating cylinder (rotating member) 38B, a fifth rotating cylinder (rotating member) 38E, a second interlocking member (link member) 89B, and a fourth interlocking member (link member) 89D. The upper end of the second interlocking member 89B is connected to a connecting portion 88L of the first lever fixing portion 82L. The lower end of the second interlocking member 89B can be selectively connected to either a connecting portion 91L of the second rotating cylinder 38B or a connecting portion 91P of the fifth rotating cylinder 38E. The upper end of the fourth interlocking member 89D is connected to a connecting portion 88R of the second lever fixing portion 82R. The lower end of the fourth interlocking member 89D can be selectively connected to either a connecting portion 91Q of the fifth rotating cylinder 38E or a connecting portion 91R of the second rotating cylinder 38B.

[0054] As shown in FIG. 2 and other figures, the lower end of the second interlocking member 89B is connected to the connecting portion 91L of the second rotating cylinder 38B, and the lower end of the fourth interlocking member 89D is connected to the connecting portion 91Q of the fifth rotating cylinder 38E. In this case, when the first operation lever 71L is swung in the front-rear direction K1, the spool S3 of the third control valve V3 is pushed and pulled via the second interlocking member 89B, the second rotating cylinder 38B, the second arm 39B, the link 40B, and the like. Then, the arm cylinder C4 is controlled to swing the arm 16 forward and backward. Also, when the second operation lever 71R is swung in the front-rear direction K1, the spool S10 of the tenth control valve V10 is pushed and pulled via the fourth interlocking member 89D, the fifth rotating cylinder 38E, the fifth arm 39E, the link 40E, and the like. Then, the boom cylinder C3 is controlled to swing the boom 15 forward and backward. That is, in this case, the objects to be operated by the forward and backward swing of the first control lever 71L are the third control valve V3, the arm cylinder C4, and the arm 16. Also, the objects to be operated by the forward and backward swing of the second control lever 71R are , the tenth control valve V10, the boom cylinder C3, and the boom 15.

[0055] On the other hand, the lower end of the second interlocking member 89B is connected to the connecting portion 91P of the fifth rotating cylinder 38E, and the lower end of the fourth interlocking member 89D is connected to the connecting portion 91R of the second rotating cylinder 38B. In this case, when the first operation lever 71L is swung in the front-rear direction K1, the spool S10 of the tenth control valve V10 is pushed and pulled via the second interlocking member 89B, the fifth rotating cylinder 38E, the fifth arm 39E, the link 40E, and the like. Then, the boom cylinder C3 is controlled to swing the boom 15 forward and backward. Also, when the second operation lever 71R is swung in the front-rear direction K1, the spool S3 of the third control valve V3 is pushed and pulled via the fourth interlocking member 89D, the second rotating cylinder 38B, the second arm 39B, the link 40B, and the like. Then, the arm cylinder C4 is controlled to swing the arm 16 forward and backward. That is, in this case, the objects operated by swinging the first control lever 71L back and forth are the tenth control valve V10, the boom cylinder C3, and the boom 15. Also, the objects operated by swinging the second control lever 71R back and forth are the third control valve V3, the arm cylinder C4, and the arm 16.

[0056] A lock lever 50A is provided on the left side of the control platform 23. The lock lever 50A is a member that performs the locking (mechanically restraining so as not to move) and unlocking (releasing the mechanical restraint so as to move) operations of the operating member 41 and the control member 71. The lock lever 50A is disposed on the outer side of the aircraft body of the first control lever 71L. The lock lever 50A has a lever body 52 with a grip 51 attached to its tip. As shown in Fig. 2 and other figures, the base (lower part) of the lever body 52 is fixed to the left end of the first shaft part 34A of the operation spindle 34. This allows the lock lever 50A to rotate integrally with the operation spindle 34 and to be operated to swing up and down.

[0057] The lock lever 50A can be moved up and down to a first position X1a (see FIG. 5A, which will be described later) and a second position X2a (see FIG. 5B, which will be described later). The first position X1a is a position where the lock lever 50A is raised (the tip of the lever body 52 faces diagonally upward and rearward). The second position X2a is a position where the lock lever 50A is lowered (the tip of the lever body 52 faces diagonally downward and rearward). The length of the lock lever 50A (the length from the base to the tip of the lever body 52) is shorter than the length of a conventional lock lever as disclosed in the cited document 1. Therefore, whether the lock lever 50A is in the first position X1a or the second position X2a, it does not protrude into the aisle 22 (FIG. 9) and does not prevent the driver from getting on and off the vehicle body 2 via the aisle 22.

[0058] When the lock lever 50A is in the first position X1a, the operating member 41 and the steering member 71 are locked, and the operating member 41 and the steering member 71 cannot be operated. When the lock lever 50A is in the second position X2a, the operating member 41 and the steering member 71 are unlocked, and the operating member 41 and the steering member 71 can be operated. As shown in Fig. 4 etc., a limit switch 117 is provided inside the machine body at the upper part of the first vertical member 27. An abutment member 97A is provided on the peripheral surface of the left end part of the cylindrical body 39L so as to protrude radially outward and upward from the cylindrical body 39L. The first shaft portion 34A of the operation support shaft 34 is inserted inside the cylindrical body 39L. The cylindrical body 39L and the first shaft portion 34A are fixed. Therefore, the cylindrical body 39L and the abutment member 97 rotate integrally with the operation support shaft 34.

[0059] When the lock lever 50A is in the first position X1a (lock position of the operating member 41 and the steering member 71), the abutment member 97A is separated from the limit switch 117, and the limit switch 117 is turned off (the state shown in Figs. 2 and 4). When the lock lever 50A is in the second position X2a (unlock position of the operating member 41 and the steering member 71), the abutment member 97A abuts against the limit switch 117, and the limit switch 117 is turned on.

[0060] When the limit switch 117 is in the on state, an on signal is sent from the limit switch 117 to an electronic control device (not shown) provided in the work machine 1. When the limit switch 117 is in the off state, no on signal is sent from the limit switch 117 to the electronic control device. This allows the electronic control device to detect the position of the lock lever 50A based on the presence or absence of an on signal from the limit switch 117.

[0061] An urging member 106 that holds the lock lever 50A at the first position X1a and the second position X2a is provided inside the machine body at an upper portion of the second vertical member 28. The urging member 106 is a tension coil spring. The rear end of the urging member 106 is hooked to a first spring hook portion 70 provided on the connection member 11X. As shown in FIG. 3, the front end of the urging member 106 is hooked to a second spring hook portion 72 fixed to the second vertical member 28 via a holding plate 100.

[0062] The biasing force of the biasing member 106 acts on the lock lever 50A in a different direction depending on whether the lock lever 50A is located at the first position X1a or the second position X2a. That is, when the lock lever 50A is in the first position X1a, the axis of the biasing member 106 is located above the axis of the operation support shaft 34. Therefore, when the lock lever 50A is in the first position X1a (the state in FIGS. 1 to 5A), the biasing force of the biasing member 106 acts to rotate the lock lever 50A in a direction to raise the lock lever 50A (the upward direction of the grip 51, the locking direction F1 in FIG. 5A, etc.). This biasing force holds the lock lever 50A in the first position X1a.

[0063] Furthermore, when the lock lever 50A is in the second position X2a, the axis of the biasing member 106 is located below the axis of the operation support shaft 34. Therefore, when the lock lever 50A is in the second position X2a (the state in FIG. 5B), the biasing force of the biasing member 106 acts to rotate the lock lever 50A in a direction to tilt the lock lever 50A (the downward direction of the grip 51, the unlocking direction F2 in FIG. 5B, etc.). This biasing force holds the lock lever 50A in the second position X2a.

[0064] As shown in FIG. 4, a stopper 105 is provided on the front A1 of the contact plate 11E of the connection member 11X. The stopper 105 is a bolt. The stopper 105 is screwed into a screw hole (not shown) formed in a penetrating manner in the second wall 31b of the second connecting member 31. A lock nut 108 that fixes the position of the stopper 105 is screwed into the stopper 105. When the lock lever 50A is in the first position X1a, the contact plate 11E and the stopper 105 abut against each other. This limits the rotation of the lock lever 50A in the upward direction (lock direction F1 in FIG. 5A, etc.).

[0065] A stopper 105A is provided at the rear A2 of the connection member 11X. The stopper 105A is a bolt. The stopper 105A is fixed to the second vertical member 28 via the holding plate 100A. The stopper 105A is screwed into a screw hole (not shown) formed through the holding plate 100A. A third lock nut 108A that fixes the position of the stopper 105A is screwed into the stopper 105A. When the lock lever 50A is in the second position X2a, the abutment plate 11F and the stopper 105A abut against each other. This limits the rotation of the lock lever 50A in the downward direction (the unlock direction F2 in FIG. 5B, etc.).

[0066] By screwing the stoppers 105, 105A forward or backward, the position of the lock lever 50A around the operation shaft 34 at the first position X1a and the second position X2a can be adjusted. As described above, the swingable angle of the lock lever 50A limited by the stoppers 105, 105A (the movement angle from one of the first position X1a and the second position X2a to the other) is smaller than the swingable angle of the conventional lock lever as disclosed in Cited Document 1.

[0067] 2, 4, etc., a locking mechanism 314 for locking or unlocking the operating member 41 is provided near the center of the operation spindle 34. In addition, locking mechanisms 112, 113 for locking or unlocking the operating member 71 are provided on both the left and right sides of the locking mechanism 314. The structure and operation of the locking mechanisms 112, 113 for the operating member 71 are similar to those of known technology, so a description thereof will be omitted.

[0068] Next, the lock mechanism 314 will be described. Fig. 5A is a cross-sectional view showing a locked state of the lock mechanism 314. Fig. 5B is a cross-sectional view showing the unlocked state of the lock mechanism 314. The lock mechanism 314 can be switched between a locked state in which the movement of the operating member 41 is restricted and an unlocked state in which the movement of the operating member 41 is permitted. As shown in FIGS. 4 to 5B, the lock mechanism 314 has engagement portions 45L, 45R, a locking body 326, and a drive portion 331.

[0069] 4, the first engagement portion 45L is provided to protrude from the first base portion 44L of the first travel lever 41L toward the rear A2, radially outward from the first base portion 44L and the operation spindle 34. The second engagement portion 45R is provided to protrude from the second base portion 44R of the second travel lever 41R toward the rear A2, radially outward from the second base portion 44R and the operation spindle 34. Therefore, the first engagement portion 45L rotates integrally with the first travel lever 41L, and the second engagement portion 45R rotates integrally with the second travel lever 41R. That is, the engagement portions 45L and 45R rotate integrally with the operation member 41.

[0070] A first engagement groove 46L is formed at the tip of the first engagement portion 45L. A second engagement groove 46R is formed at the tip of the second engagement portion 45R. The first engagement groove 46L and the second engagement groove 46R are recessed radially inward of the operation support shaft 34 from the rear A2 toward the front A1. In other words, the first engagement groove 46L and the second engagement groove 46R are grooves that are open toward the rear A2 side and recessed toward the operation support shaft 34 from the tips of the first engagement portion 45L and the second engagement portion 45R. As shown in FIG. 5A and FIG. 5B, the first engagement groove 46L and the second engagement groove 46R are provided above and below the front portions thereof with inclined surfaces 47 that form a taper in which the distance between them increases toward the rear A2.

[0071] The locking body 326 has a base tube 326A, a locking arm 326B, a locking pin 326C, and a groove 326D. The base tube 326A constitutes the lower end (one end) of the locking body 326. The base tube 326A is located between the third rotating tube 38C and the fourth rotating tube 38D, and is attached around the operating shaft 33 so as to be rotatable about its axis. That is, the operating shaft 33 supports the locking body 326 so as to be rotatable relative to the operating shaft 33.

[0072] The lock arm 326B is provided on the radially outer side of the base tube 326A and protrudes upward. The lock arm 326B and the base tube 326A are integral with each other. The base tube 326A rotates relative to the axis of the operating shaft 33, causing the lock arm 326B to swing in the front-rear direction K2. The upper end of the lock arm 326B is located between the first engagement portion 45L and the second engagement portion 45R. The lock body 326 is disposed from the operating shaft 33 to the radially outer side of the second rotating tube 38B, via the rear A2, and across the operating support shaft 34. A groove portion 326D recessed toward the rear A2 is provided in the center portion of the lock arm 326B.

[0073] The lock pin (engaged portion) 326C is provided at the upper end of the lock arm 326B. The lock pin 326C is fixed to the lock arm 326B in a state in which it penetrates the upper end of the lock arm 326B from the left to the right. That is, the lock pin 326C protrudes from the lock arm 326B to both sides in the machine body width direction K2. The left protruding length and the right protruding length of the lock pin 326C from the lock arm 326B are equal.

[0074] A cylinder 327 (FIG. 4) is provided between the first base 44L of the first travel lever 41L and the second base 44R of the second travel lever 41R. The cylinder 327 is attached around the first shaft portion 34A of the operation support shaft 34 and fixed to the first shaft portion 34A. The driving unit 331 is a member that applies a driving force to the lock body 326, and has an interlocking unit 332 and a connecting member 333. The interlocking unit 332 is provided on the cylindrical body 327 that is attached around the operation support shaft 34, and is provided so as to protrude radially outward from the cylindrical body 327 and obliquely upward and rearward. In other words, the interlocking unit 332 is provided on the operation support shaft 34 via the cylindrical body 327. The cylindrical body 327 and the interlocking unit 332 rotate integrally with the operation support shaft 34. As another example, the interlocking unit 332 may be provided on the operation support shaft 34 itself.

[0075] 5A and 5B, the connecting member 333 is disposed from above the operation support shaft 34, passing through the rear A2 (radially outer side), and extending downward. The connecting member 333 is connected to the interlocking portion 332 and the locking body 326 so as to be relatively rotatable. More specifically, an upper end of the connecting member 333 is rotatably connected to the interlocking portion 332 via a pin 135. A lower end of the connecting member 333 is rotatably connected to the locking body 326 via a pin 136.

[0076] The connecting portion (pin 135) between the interlocking portion 332 and the connecting member 333 is located at an upper position farther from the operating shaft 33 than the lock pin 326C of the lock body 326. The connecting portion (pin 136) between the lock body 326 and the connecting member 333 is located at a lower position closer to the operating shaft 33 than the lock pin 326C. 5A, when the lock lever 50A is in the first position X1a, the lock pin 326C is engaged (inserted) into the first engagement groove 46L and the second engagement groove 46R. As a result, the vertical movement of the first engagement portion 45L and the second engagement portion 45R is restricted (blocked), and the movement of the first travel lever 41L and the second travel lever 41R is also restricted, making it impossible to swing these operating members 41.

[0077] 5A, the locking body 326 is engaged with the first engaging portion 45L and the second engaging portion 45R, and is in an engaging position P1a that restricts the movement of the operating member 41. That is, the locking mechanism 314 is in a locked state that restricts the movement of the operating member 41. At this time, the second rotating cylinder 38B is in a state of being inserted into the groove portion 326D without contacting the locking body 326. By adjusting the contact positions of the stoppers 105, 105A and the contact plates 11E, 11F (FIG. 4) of the connection member 11X, the insertion depth of the lock pin 326C into the first engagement groove 46L and the second engagement groove 46R can be adjusted.

[0078] From the locked state of FIG. 5A, the lock lever 50A is swung downward to the second position X2a. Then, the driving unit 331 transmits the operating force for changing the position of the lock lever 50A as a driving force to the lock body 326, and rotates the lock body 326 around the axis of the operation shaft 33. Specifically, the operating force applied to the lock lever 50A rotates the operation support shaft 34, the cylinder body 327, and the interlocking unit 332 in the unlocking direction F2. Then, as shown in FIG. 5B, the interlocking unit 332 moves the connecting member 333 diagonally downward backward, and the connecting member 333 rotates the lock arm 326B downward. Therefore, the lock arm 326B rotates (swings) around the axis of the operation shaft 33 in the unlocking direction F2. Then, the lock pin 326C moves diagonally downward backward and is released from the first engagement groove 46L and the second engagement groove 46R.

[0079] As a result, the first engagement portion 45L and the second engagement portion 45R are permitted to move up and down (restraint is released), so that the first travel lever 41L and the second travel lever 41R are also permitted to move, making it possible to swing these operating members 41. 5B, the locking body 326 is in a disengaged position P2a that disengages from the first engagement portion 45L and the second engagement portion 45R and allows the movement of the operating member 41. In other words, the locking mechanism 314 is in an unlocked state that allows the movement of the operating member 41. At this time, the second rotating cylinder 38B is almost out of the groove portion 326D of the locking body 326.

[0080] From the unlocked state of FIG. 5B, the lock lever 50A is swung upward to the first position X1a. Then, the driving unit 331 transmits the operating force for changing the position of the lock lever 50A as a driving force to the lock body 326, and rotates the lock body 326 around the axis of the operation shaft 33. Specifically, the operating force applied to the lock lever 50A rotates the operation support shaft 34, the cylinder body 327, and the interlocking unit 332 in the locking direction F1. Then, as shown in FIG. 5A, the interlocking unit 332 moves the connecting member 333 obliquely upward and forward, and the connecting member 333 rotates the lock arm 326B upward. Therefore, the lock arm 326B rotates (swings) around the axis of the operation shaft 33 in the locking direction F1. Then, the lock pin 326C moves forward A1 and engages with the first engagement groove 46L and the second engagement groove 46R.

[0081] As a result, the vertical movement of the first engagement portion 45L and the second engagement portion 45R and the movement of the first travel lever 41L and the second travel lever 41R are restricted, making it impossible to swing the operating member 41. That is, the lock body 326 changes position (moves) from the disengaged position P2a shown in Fig. 5B to the engaged position P1a as shown in Fig. 5A where the lock body 326 engages with the first engaging portion 45L and the second engaging portion 45R to restrict the movement of the operating member 41. Also, the lock mechanism 314 returns to a state where the operating member 41 is locked.

[0082] As described above, the locking body 326 is movable between the engagement position P1a shown in FIG. 5A and the disengagement position P2a shown in FIG. 5B. In the above embodiment, the operating force of the lock lever 50A is used as the driving force of the driving unit 331. However, instead, the driving force may be generated by an actuator 339 provided in the driving unit 331 as shown in FIGS. 6A and 6B.

[0083] Fig. 6A is a cross-sectional view showing a modified lock mechanism 314 in a locked state, and Fig. 6B is a cross-sectional view showing a modified lock mechanism 314 in an unlocked state. 6A and 6B includes an actuator 339 that generates a driving force. The actuator 339 may be, for example, a hydraulic actuator such as a hydraulic cylinder, or an electric actuator such as a solenoid. The actuator 339 is disposed above and in front of the operation support shaft 34 at A1.

[0084] A cylindrical body 337 is provided around the operation spindle 34. The cylindrical body 337 is rotatable relative to the operation spindle 34. The cylindrical body 337 is provided with interlocking portions 332a, 332b. The interlocking portion 332a protrudes radially outward from the cylindrical body 337 and obliquely upward and rearward. A front end portion of a connecting member 333 is rotatably connected to the interlocking portion 332a via a pin 135.

[0085] The interlocking portion 332b protrudes obliquely downward and forward from the radially outer side of the cylindrical body 337. That is, the interlocking portion 332b is disposed below the interlocking portion 332a and in the forward direction A1. A pin 338a included in a link mechanism 338 is engaged with a long hole 332c formed in the interlocking portion 332b. The link mechanism 338 is connected to the pin 338a and an operating element 339a protruding downward from the actuator 339. The link mechanism 338 transmits a driving force generated by the actuator 339 to the interlocking portion 332b. A main body 339b of the actuator 339 is fixed to the third connecting member 32 (FIG. 2) via, for example, a bracket or the like.

[0086] An operating device such as a button, switch, or lever for driving the actuator 339 may be provided on the control stand 23. A control unit for controlling the operation of the actuator 339 may also be provided on the control stand 23. In the state shown in Fig. 6A, the actuator 339 generates a driving force to protrude the operating element 139a downward by means of an elastic member (not shown), such as a built-in spring. Therefore, the driving force of the actuator 339 is transmitted in order to the link mechanism 338, the interlocking portion 332b, the cylindrical body 337, the interlocking portion 332a, the connecting member 333, and the locking body 326, and the locking body 326 is rotated in the locking direction F1. In addition, the locking pin 326C is engaged with the engagement grooves 46L and 46R. That is, in Fig. 6A, the locking body 326 is in the engagement position P1a, and the locking mechanism 314 locks the operating member 41.

[0087] From the locked state, the actuator 339 is driven to move the operating element 339a upward (a state in which the operating element 339a is pulled into the main body portion 339b). Then, the driving force is transmitted in order to the interlocking portion 332b, the cylindrical body 337, the interlocking portion 32a, the connecting member 333, and the locking body 326, and the locking body 326 rotates in the unlocking direction F2 as shown in FIG. 6B. Then, the locking pin 326C is released from the engagement grooves 46L, 46R. That is, in FIG. 6B, the locking body 326 moves to the release position P2a, and the locking mechanism 314 is in a state in which the operating member 41 is unlocked.

[0088] In addition to the above, for example, the link mechanism 338, the interlocking portions 332a and 332b, the cylinder 337, and the connecting member 333 may be omitted, and the operator 339a of the actuator 339 may be directly or indirectly connected to the end of the lock body 3126. In this case, the driving force of the actuator 339 is directly or indirectly applied to the lock body 326, causing the lock body 326 to rotate in the locking direction F1 or the unlocking direction F2, and the lock pin 326C can be engaged with or disengaged from the engagement grooves 46L, 46R.

[0089] 5A and 6A, when the lock mechanism 314 locks the operating member (travel lever) 41, it is preferable that the lock pin 326C is engaged so as to be positioned (enter) in the center of the engagement grooves 46L, 46R of the engagement portions 45L, 45R. In more detail, it is preferable that a gap is formed between the lock pin 326C and the groove walls of the engagement grooves 46L, 46R when no operating force is applied to the operating member 41.

[0090] In contrast, when no operating force is applied to the operating member 41, for example, as shown in FIG. Furthermore, when engagement portions 45L, 45R are in a position rotated slightly upward and lock pin 326C is in contact with the side walls of engagement grooves 46L, 46R on the pin 136 side, the operating force of lock lever 50A for unlocking or the driving force of actuator 339 becomes greater than when lock pin 326C is not in contact with the side walls of engagement grooves 46L, 46R as shown in FIG. 5A etc., and lock pin 326C and engagement portions 45L, 45R become more susceptible to wear.

[0091] Furthermore, connecting rods 48L, 48R for operating the spools S4, S7 of the control valves V4, V7 are connected to the bases 44L, 44R of the operating member 41 via not only the engaging portions 45L, 45R but also the arm protrusions 45X, 45Y and the ball joints 49L, 49R. For this reason, as described above, when no operating force is applied to the operating member 41, the engaging portions 45L, 45R are in a position rotated slightly upward and the lock pin 326C is in contact with the side walls of the engaging grooves 46L, 46R on the pin 136 side, there is a difference in the timing at which the spools S4, S7 of the control valves V4, V7 start to move and in the operating load when the operating member 41 is swung forward A1 from the neutral position and when the operating member 41 is swung backward A2 from the neutral position.

[0092] As a countermeasure, the control stand 23 is provided with a lock adjustment structure that adjusts the lock state of the lock mechanism 314, i.e., the engagement state between the engagement grooves 46L, 46R of the engagement parts 45L, 45R and the lock pin (engaged part) 326C. The lock adjustment structure includes the connecting rods 48L, 48R, the ball joints 49L, 49R, and the arm protrusions 45X, 45Y shown in Figures 3 and 5A.

[0093] As shown in FIG. 3, the arm protrusions 45X, 45Y are provided at positions different from the engaging portions 45L, 45R at the bases 44L, 44R of the operating members 41L, 41R, respectively, so as to protrude toward the radial outside of the operation support 34 and toward the front A1. The ball joints 49L, 49R are rotatably connected to the arm protrusions 45X, 45Y. The upper ends of the connecting rods 48L, 48R are connected to the ball joints 49L, 49R, respectively. The lower ends of the connecting rods 48L, 48R are connected to the spools S4, S7 of the control valves V4, V7 via the connecting blocks 48X, 48Y, respectively. The connecting rods 48L, 48R are rotatably connected to the connecting blocks 48X, 48Y around the axes of the connecting rods 48L, 48R, respectively. The connecting blocks 48X, 48Y are rotatably connected to the spools S4, S7.

[0094] The connecting rods 48L, 48R and the ball joints 49L, 49R are screwed together. More specifically, a male thread 48q is formed on the outer circumferential surface of the upper end of the connecting rods 48L, 48R. The ball joints 49L, 49R are provided with cylindrical portions 49X, 49Y that protrude downward, and a female thread 49p is formed on the inner circumferential surface of the cylindrical portions 49X, 49Y. The male thread 48q of the connecting rods 48L, 48R is screwed together with the female thread 49p of the ball joints 49L, 49R, thereby connecting the connecting rods 48L, 48R and the ball joints 49L, 49R.

[0095] The connecting rods 48L, 48R are rotated about their axes to adjust the depth of engagement of the male threads 48q of the connecting rods 48L, 48R with the female threads 49p of the ball joints 49L, 49R. This allows the positions of the engaging parts 45L, 45R (FIG. 5A, etc.) of the locking mechanism 314 around the operation support shaft 34 to be adjusted via the ball joints 49L, 49R, the arm protrusions 45X, 45Y, and the bases 44L, 44R of the travel levers 41L, 41R. In other words, the positions of the engaging grooves 46L, 46R of the engaging parts 45L, 45R with respect to the lock pin 326C (the state of engagement between the engaging grooves 46L, 46R and the lock pin 326C) can be adjusted.

[0096] FIG. 8 is a diagram showing another example of the lock adjustment structure. 8, the lock adjustment structure includes a relay member 340 in addition to the connecting rods 48L, 48R, the ball joints 49L, 49R, and the arm protrusions 45X, 45Y. The connecting structure between the arm protrusions 45X, 45Y and the ball joints 49L, 49R, and the connecting structure between the connecting rods 48L, 48R, the connecting blocks 48X, 48Y, and the spools S4, S7 of the control valves V4, V7 are similar to the connecting structures described above.

[0097] An intermediate member 340 is provided between the ball joints 49L, 49R and the connecting rods 48L, 48R. The connecting rods 48L, 48R have cylindrical portions 48U, 48V at their upper ends. The cylindrical portions 48U and 48V are provided with female threads 48p (second screwed portion; not shown) on their inner peripheral surfaces. The cylindrical portions 49X and 49Y of the ball joints 49L and 49R are provided with female threads 49p (first screwed portion; not shown) on their inner peripheral surfaces. The relay member 340 has an outer peripheral surface at its upper end with a male thread 340q (first screwed portion; not shown) formed thereon, and the relay member 340 has an outer peripheral surface at its lower end with a male thread 340s (second screwed portion; not shown) formed thereon. The female threads 49p of the cylindrical portions 49X and 49Y of the ball joints 49L and 49R and the male threads 340q at the upper end of the relay member 340 are formed in a right-handed screw shape. The female thread portions 48p of the cylindrical portions 48U, 48V of the connecting rods 48L, 48R and the male thread portion 340s at the lower end portion of the relay member 340 are formed in a left-handed screw shape.

[0098] The connecting rods 48L, 48R are connected to the relay member 340 and the ball joints 49L, 49R by screwing the female threaded portions 48p thereof into the male threaded portion 340s at the lower end of the relay member 340 and by screwing the female threaded portions 49p thereof into the male threaded portion 340q at the upper end of the relay member 340. The relay member 340 is rotated about its axis to adjust the screw depth of the male thread portion 340s at the lower end of the relay member 340 relative to the female thread portion 48p of the connecting rods 48L, 48R and the screw depth of the male thread portion 340q at the upper end of the relay member 340 relative to the female thread portion 49p of the ball joints 49L, 49R. Alternatively, the connecting rods 48L, 48R are rotated about their axis to adjust the screw depth of the male thread portion 340s at the lower end of the relay member 340 relative to the female thread portion 48p of the connecting rods 48L, 48R. This allows the positions of the engagement portions 45L, 45R of the lock mechanism 314 around the operation support shaft 34 to be adjusted via the ball joints 49L, 49R, the arm protrusions 45X, 45Y, and the bases 44L, 44R of the travel levers 41L, 41R. That is, the positions of the engagement grooves 46L, 46R of the engagement portions 45L, 45R relative to the lock pin 326C (the engagement state between the engagement grooves 46L, 46R and the lock pin 326C) are adjustable.

[0099] Moreover, both the connecting portion between the connecting rods 48L, 48R and the relay member 340 and the connecting portion between the relay member 340 and the ball joints 49L, 49R have a screw structure, and one of the screw structures is formed as a left-handed screw, and the other screw structure is formed as a right-handed screw. Therefore, the lock adjustment structure shown in Fig. 8 can improve the adjustment accuracy of the position of the engagement parts 45L, 45R of the lock mechanism 314 around the operation support shaft 34 compared to the lock adjustment structures shown in Figs. 3 and 5A. That is, the adjustment accuracy of the position of the engagement grooves 46L, 46R of the engagement parts 45L, 45R relative to the lock pin 326C (the engagement state between the engagement grooves 46L, 46R and the lock pin 326C) can be improved.

[0100] As a result, as shown in FIG. 8, when the lock mechanism 314 locks the operating member (travel lever) 41, the lock pin 326C can be reliably positioned in the center of the engagement grooves 46L, 46R of the engagement parts 45L, 45R. In particular, when no operating force is applied to the operating member 41, a gap can be reliably formed between the lock pin 326C and the groove walls of the engagement grooves 46L, 46R. This prevents the operating force of the lock lever 50A for unlocking the operating member 41 by the lock mechanism 314 or the driving force of the actuator 339 from increasing, making it difficult for the lock pin 326C and the engagement parts 45L, 45R to wear out. In addition, the difference in the timing at which the spools S4, S7 of the control valves V4, V7 start to move and the difference in the operating load can be reduced between when the operating member 41 is swung forward A1 from the neutral position and when the operating member 41 is swung backward A2 from the neutral position.

[0101] 8, the corresponding connecting rods 48L, 48R and the ball joints 49L, 49R are connected by one relay member 340, but the corresponding connecting rods 48L, 48R and the ball joints 49L, 49R may be connected by a plurality of relay members 340. In this case, the relay members 340 may be connected to each other by a screw structure. Also, in the transmission path of the operating force from the ball joints 49L, 49R to the connecting rods 48L, 48R via the plurality of relay members 340, right-handed screw structures and left-handed screw structures may be alternately arranged.

[0102] The work machine 1 of this embodiment provides the following advantages. The working machine 1 according to this embodiment includes a machine body 2 and a control stand 23 provided on the machine body 2. The control stand 23 includes a first axis (operation support shaft) 34 extending in the width direction K2 of the machine body 2 and a drive shaft 34 of the first axis 34. The lock mechanism 314 includes a first operating member 41 supported so as to be rotatable relative to the first shaft 34 about its axis, a lock mechanism 314 switchable between a locked state in which the movement of the first operating member 41 is restricted and an unlocked state in which the movement of the operating member 41 is permitted, a second shaft (operating shaft) 33 provided in parallel with the first shaft 34, and a second operating member (dozer lever) 66 supported so as to be rotatable relative to the second shaft 33 about the axis of the second shaft 33. The lock mechanism 314 includes engagement portions 45L, 45R which rotate integrally with the first operating member 41, and an engagement portion 66 which engages with the engagement portions 45L, 45R. The second shaft 33 supports the locking body 326 so that it can rotate relatively to the second shaft 33, and the locking body 326 is capable of rotating about the axis of the second shaft 33 when a driving force is applied by the driving unit 331, and is capable of changing its position between an engagement position P1a where the engaged portion 326C engages with the engaging portions 45L, 45R and a disengagement position P2a where the engaged portion 326C disengages from the engaging portions 45L, 45R.

[0103] According to the above configuration, a dedicated support member for supporting the locking body 326 of the locking mechanism 314 is not provided, and the locking body 326 is supported by the second shaft 33 that supports the second operating member 66. Therefore, compared to the conventional locking mechanism disclosed in Patent Document 1, the number of components of the locking mechanism 314 and the number of dedicated parts for supporting the locking mechanism 314 can be reduced, and the cumulative amount of dimensional errors caused by bending or wear of these parts can be kept small. As a result, it is possible to improve the operating accuracy of the locking mechanism 114 that locks or unlocks the movement of the operating member 41 and to maintain the operating accuracy at a high level.

[0104] In this embodiment, the control stand 23 has a plurality of third operating members 71L, 71R (first operating lever 71L, second operating lever 71R) capable of operating a plurality of operation objects (control valves V3, V10, arm cylinder C4, boom cylinder C3, arm 16, boom 15), respectively, and an operation switching mechanism 315 for switching the operation objects of the plurality of third operating members 71L, 71R. The operation switching mechanism 315 has a third shaft (support shaft) 37 provided between the first shaft 34 and the second shaft 33 in parallel with the first shaft 34, and an axis of the third shaft 37. The locking body 326 includes a plurality of rotating members 38B, 38E (second rotating cylinder 38B, fifth rotating cylinder 38E) supported around the center so as to be rotatable relative to the third shaft 37, and a plurality of link members 89B, 89D (second interlocking member 89B, fourth interlocking member 89D) selectively rotatably connected to any one of the plurality of third operating members 71L, 71R and any one of the plurality of rotating members 38B, 38E, and is disposed from the second shaft 33 to the first shaft 34 via the radial outside of any one of the plurality of rotating members 38B, 38E. This allows the locking mechanism 314 and the operation switching mechanism 315 to be disposed in the space from the first shaft 34 to the second shaft 33 inside the control stand 23, thereby making it possible to keep the space occupied by the locking mechanism 314 and the operation switching mechanism 315 small.

[0105] In this embodiment, the driving unit 331 has an interlocking unit 332 provided on the first shaft 34 and rotatable integrally with the first shaft 34, and a connecting member 333 connected to the interlocking unit 332 and the locking body 326 so as to be rotatable relative to the first shaft 34, and a connecting portion between the interlocking unit 332 and the connecting member 333 is disposed at a position farther from the second shaft 33 than the engaged portion 326C of the locking body 326, and a connecting portion between the locking body 326 and the connecting member 333 is disposed at a position closer to the second shaft 33 than the engaged portion 326C of the locking body 326. This allows the rotational driving force of the first shaft 34 to be transmitted to the locking body 326 by the interlocking unit 332 and the connecting member 333, and the locking body 326 to be moved between the engaged position P1a and the disengaged position P2a. In addition, the connection portion between locking body 326 and connecting member 333, which is the force point of locking body 326, is located closer to second shaft 33, which is the fulcrum of locking body 326, than engaged portion 326C, which is the point of action of locking body 326. Therefore, even if the rotation angle of first shaft 34 is small, locking body 326 can be rotated to engage and disengage engaged portion 326 with respect to engaging portions 45L, 45R.

[0106] In this embodiment, the engagement portions 45L, 45R protrude from the base portions 44L, 44R of the first operating member 41 radially outward of the first shaft 34, and have engagement grooves 46L, 46R recessed from the tips of the engagement portions 45L, 45R toward the first shaft 34, the interlocking portion 332 protrudes upward on the radially outer side of the first shaft 34, the connecting member 333 is disposed downward from above the first shaft 34 via the radially outer side, the second shaft 33 is disposed below the first shaft 34, and the locking body 332 is disposed between the first shaft 34 and the locking member 332. The locking body 126 swings in the front-rear direction K1 around the axis of the second shaft 33, and the engaged portion 326C is formed of a lock pin 326C that protrudes from the upper end of the locking body 326 in the width direction K2 of the machine body 2 and engages with or disengages from the engagement grooves 46L, 46R. This allows the locking body 126 to be easily moved between a position P1a where the locking pin 326C engages with the engagement grooves 46L, 46R and a position P2a where the locking pin 326C disengages from the engagement grooves 46L, 46R by rotating the locking body 326. In addition, the connecting portion between the locking body 326 and the connecting member 333, which is the force point of the locking body 326, can be positioned closer to the second shaft 33, which is the fulcrum of the locking body 326, than the engaged portion 326C, which is the point of action of the locking body 326.

[0107] In the present embodiment, the control stand 23 includes arm projections 45X, 45Y that project radially outward from the first shaft 34 from positions different from the engagement portions 45L, 45R in the bases 41L, 41R of the first operating member 41, joints (ball joints) 49L, 49R rotatably connected to the arm projections 45X, 45Y, rods (connecting rods) 48L, 48R having one end (lower end) connected to the spools S4, S7 of the control valves V4, V7, and a first screw portion (mesh portion) provided on the joints 49L, 49R. and a relay member 340 including a first screwed portion (male threaded portion) 340q screwed into a second screwed portion (female threaded portion) 48p provided on the other end (upper end) of the rod 48L, 48R, and a second screwed portion (male threaded portion) 340s screwed into a second screwed portion (female threaded portion) 48p provided on the other end (upper end) of the rod 48L, 48R, and of the screwed structure of the first screwed portion 49p and the first screwed portion 340q and the screwed structure of the second screwed portion 48p and the second screwed portion 340s, one screwed structure is formed in a right-handed thread shape and the other screwed structure is formed in a left-handed thread shape.

[0108] As described above, by rotating the rods 48L, 48R or the relay member 340 around the axis and adjusting the screw-in depth between the rods 48L, 48R and the relay member 340 or the screw-in depth between the relay member 340 and the joints 49L, 49, the position of the engagement portions 45L, 45R of the locking mechanism 314 around the first axis 34 can be adjusted with high precision, and the engagement state between the engagement grooves 46L, 46R of the engagement portions 45L, 45R and the engaged portion 326C can be appropriately adjusted.

[0109] In this embodiment, the lock body 326 has a groove 326D into which any of the plurality of rotating members 38B, 38E enters without contacting the lock body 326 when the lock body 326 is at the engagement position P1a. This allows the lock body 326 to be disposed close to the third shaft 37 supporting the rotating members 38B, 38E, and the amount of protrusion of the lock mechanism 314 toward the rear A2 to be kept small. In addition, the lock body 326 can be prevented from contacting any of the rotating members 38B, 38E (rotating member 38E in the example of FIGS. 5A and 6A) when the lock body 326 is at the engagement position P1a, and the performance of the lock mechanism 314 and the operation switching mechanism 315 can be maintained at a high level.

[0110] Also, in this embodiment, the control stand 23 has a lock lever 50A that can be changed between a first position X1a and a second position X2a by swinging it, and the drive unit 331 transmits the operating force for changing the position of the lock lever 50A as a driving force to the lock body 326, causing the lock body 326 to rotate about the axis of the second shaft 33 and change its position between the engaged position P1a and the disengaged position P2a. This makes it possible to easily switch the lock mechanism 314 between a locked state and an unlocked state by the operating force applied to the lock lever 50A.

[0111] In this embodiment, the drive unit 331 has an actuator 339 that generates a drive force. Thus, by driving the actuator 339, the lock mechanism 314 can be easily switched between a locked state and an unlocked state. In this embodiment, the working machine 1 includes a traveling device 3 that supports the machine body 2 so that the machine body 2 can travel, and a working device 4 and a dozer device 7 supported by the machine body 2. The control stand 23 has a plurality of levers 41L, 41R, 71L, 71R, 66 that respectively operate the traveling device 3, the working device 4, and the dozer device 7. Among the plurality of levers 41L, 41R, 71L, 71R, 66, the traveling levers 41L, 41R (first traveling lever 41L, second traveling lever 41R) that operate the traveling device 3 constitute the first operating member 41, the dozer lever 66 that operates the dozer device 7 constitutes the second operating member 66, and the control levers 71L, 71R (first control lever 71L, second control lever 71R) that operate the working device 4 constitute the third operating members 71L, 71R. As a result, the locking body 326 is supported by the second shaft 33 that supports the dozer lever 66, and the locking mechanism 325 is operated by the locking mechanism 326. The number of components of the lock mechanism 314 can be made smaller than the number of components of a conventional lock mechanism. Also, the movement of the travel levers 41L, 41R can be locked or unlocked by the lock mechanism 314. Also, by combining the lock mechanisms 112, 113 for the steering levers 71L, 71R with the lock mechanism 314, it is possible to lock or unlock the movement of both the steering levers 71L, 71R and the travel levers 41L, 41R by swinging the lock lever 50A.

[0112] Furthermore, in this embodiment, the working device 4 includes a boom 15 rotatably connected to the machine body 2 and an arm 16 rotatably connected to the tip of the boom 15, the third operating members 71L, 71R include a plurality of control levers 71L, 71R that respectively operate the boom 15 and the arm 16, and the operation switching mechanism 315 can switch each of the plurality of control levers 71L, 71R to a boom operation lever that operates the boom 15 and an arm operation lever that operates the arm 16. As a result, the operation switching mechanism 315 that switches the operation target of the control levers 71L, 71R to the boom 15 or the arm 16, and the lock mechanism 314 are provided inside the operating platform 23, and the space occupied by the operation switching mechanism 315 and the lock mechanism 314 inside the operating platform 23 can be kept small.

[0113] Although the present invention has been described above, the embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0114] 1 Work equipment 2. Aircraft 3 Running gear 4 Work equipment 7 Dozer equipment 15 Boom (operable object) 16 Arm (operation target) 23 Control Platform 33 Operation axis (second axis) 34 Operation spindle (1st axis) 37 Operation axis (3rd axis) 38B Second rotating cylinder (rotating member) 38E 5th rotating cylinder (rotating member) 41 Operation member (first operation member) 41L First travel lever (first operating member) 41R Second travel lever (first operating member) 44L 1st base (base) 44R 2nd base (base) 45L First engagement part (engagement part) 45R Second engagement part (engagement part) 45X First arm protrusion 45Y Second arm protrusion 46L 1st engagement groove (engagement groove) 46R Second engagement groove (engagement groove) 48L, 48R Connecting rod (rod) 48p Female thread (second screw thread) 49L, 49R Ball joint (joint) 49p Female thread (first screw thread) 50A Lock Lever 66 Dozer lever (second operating member) 71L First control lever (third control member) 71R Second control lever (third control member) 89B Second interlocking member (link member) 89D Fourth interlocking member (link member) 314 Locking mechanism 315 Operation switching mechanism 326 Rock Body 326C Lock pin (engaged part) 326D Groove 331 Drive unit 332 Interlocking part 332a Interlocking part 332b Interlocking part 333 Connecting members 339 Actuator 340 Intermediate parts 340q Male threaded part (first threaded part) 340s Male threaded part (second threaded part) A1 forward A2 rear C3 Boom cylinder (operation target) C4 Arm cylinder (operation target) K1 Anteroposterior direction K2 Aircraft width direction (aircraft width direction) P1a Engagement position P2a Detachment position V3 Third control valve (operation target) V4 4th control valve V7 Seventh control valve S4, S7 spools V10 10th control valve (operation target) X1a 1st position X2a 2nd position

Claims

1. The aircraft and A control stand provided on the aircraft, The control platform includes: A first axis extending in a width direction of the fuselage; a first operating member supported so as to be rotatable relative to the first shaft about an axis of the first shaft; a lock mechanism switchable between a locked state in which movement of the first operating member is restricted and an unlocked state in which movement of the first operating member is permitted; A second axis provided parallel to the first axis; a second operating member supported so as to be rotatable relative to the second shaft about an axis of the second shaft, The locking mechanism includes: an engagement portion that rotates integrally with the first operating member; a locking body having an engaged portion that engages with the engaging portion; a drive unit that applies a drive force to the lock body, The second shaft supports the locking body so as to be rotatable relative to the second shaft, The locking body is capable of rotating relatively around the axis of the second shaft when a driving force is applied by the driving unit, and is capable of changing its position between an engagement position where the engaged portion engages with the engaging portion and a disengagement position where the engaged portion disengages from the engaging portion.

2. The control platform includes: A plurality of third operating members each capable of operating a plurality of operation objects; an operation switching mechanism that switches the operation targets of the plurality of third operating members, The operation switching mechanism includes: a third axis provided between the first axis and the second axis and parallel to the first axis; a plurality of rotating members supported so as to be rotatable relative to the third shaft about an axis of the third shaft; a plurality of link members selectively rotatably connected to any one of the plurality of third operating members and any one of the plurality of rotating members, The work machine according to claim 1 , wherein the locking member is disposed from the second shaft to the first shaft via a radially outer side of one of the plurality of rotating members.

3. The drive unit is A linking portion provided on the first shaft and rotatable integrally with the first shaft; a connecting member connected to the interlocking portion and the locking body so as to be capable of rotating relative to each other, a connecting portion between the interlocking portion and the connecting member is disposed at a position farther from the second shaft than the engaged portion of the locking body, 3. The work machine according to claim 1, wherein a connecting portion between the locking body and the connecting member is disposed at a position closer to the second shaft than the engaged portion of the locking body.

4. the engaging portion protrudes from a base portion of the first operating member toward an outer side in a radial direction of the first shaft, and has an engaging groove recessed from a tip end of the engaging portion toward the first shaft, The interlocking portion protrudes upwardly and radially outwardly of the first shaft, The connecting member is disposed from above the first shaft to below the first shaft via a radially outer side, The second shaft is disposed below the first shaft, The locking body swings in the front-rear direction about the axis of the second shaft, 4. The work machine according to claim 3, wherein the engaged portion is constituted by a lock pin that protrudes in the width direction of the machine body from an upper end portion of the locking body and engages with or disengages from the engagement groove.

5. The control platform includes: an arm protrusion protruding radially outward from a position different from the engagement portion at a base portion of the first operating member; a joint rotatably connected to the arm protrusion; a rod having one end connected to a spool of the control valve; a relay member including a first screwed portion screwed to a first screwed portion provided on the joint and a second screwed portion screwed to a second screwed portion provided on the other end of the rod, The work machine according to claim 4, wherein one of the screw structure of the first screwing portion and the first screwed portion and the screw structure of the second screwing portion and the second screwed portion is formed as a right-handed screw and the other screw structure is formed as a left-handed screw.

6. 3. The work machine according to claim 2, wherein the locking body has a groove into which any one of the plurality of rotating members fits without coming into contact with the locking body when the locking body is in the engaged position.

7. The control console has a lock lever that can be changed between a first position and a second position by a swing operation, The working machine according to any one of claims 1 to 6, wherein the drive unit transmits the operating force of the lock lever to the lock body as the drive force, and rotates the lock body about the axis of the second shaft to change its position between the engaged position and the disengaged position.

8. The work machine according to any one of claims 1 to 6, wherein the drive section has an actuator that generates the drive force.

9. A traveling device that supports the machine body so that it can travel; A work implement and a dozer device supported on the vehicle body, the control platform has a plurality of levers for operating the traveling device, the working device, and the dozer device, Among the plurality of levers, a traveling lever for operating the traveling device constitutes the first operating member, a dozer lever for operating the dozer device constitutes the second operating member, and 3. The work machine according to claim 2, wherein a control lever for controlling a position constitutes the third operation member.

10. The working device includes a boom rotatably connected to the machine body, and an arm rotatably connected to a tip end of the boom, the third operating member includes a plurality of control levers for operating the boom and the arm, The work machine according to claim 9 , wherein the operation switching mechanism is capable of switching each of the plurality of control levers between a boom operation lever that operates the boom and an arm operation lever that operates the arm.

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