JP4913364B2 - Work vehicle seat - Google Patents

Description

  The present invention relates to a configuration of a seat provided in a work vehicle having a work machine such as a riding rice transplanter at the rear.

Conventionally, in a work vehicle provided with a seat having a seating portion and a backrest portion on a traveling machine body and provided with a working machine behind the seat, a driver can sit on the seat and perform a driving operation. It is configured. In such a work vehicle, the operator works on the work machine with the upper body facing backward while sitting on the seat. For example, when the work vehicle is a riding type rice transplanter, the operator sits on the seat, the upper body is directed rearward or sideward, and the seedlings on the preliminary seedling stand placed in front of the aircraft are planted rearward. Replenishment is made to the seedling stage of the attaching device (for example, see Patent Document 1).
JP 2000-94997 A

  However, in a conventional work vehicle, when performing adjustment work or replenishment work on the rear working machine while the operator is seated on the seat, the backrest is used to work only with the upper body facing backward. I got in the way and had to work while standing on the steps, making it difficult to do the work. For this reason, workability was poor.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

According to claim 1, in a seat (60) of a work vehicle (1) having a work implement (17) at the rear, the seat (60) includes a seating portion (61), a backrest portion (62), and the seating. A connecting portion (63) for connecting the portion (61) and the backrest portion (62), and the connecting portion (63) has a substantially L-shaped plate in side view disposed at the center position of the seat (60). The seat portion (61) is fixed on the front and rear horizontal portions of the lower portion of the connecting portion (63), while the backrest portion (62) is fixed to the front surface of the upper and lower direction portion, and the seat portion (61 ) And the backrest portion (62) are connected by the connecting portion (63), and the seat (60) is formed in a constricted shape, and the seat support stay (55) protruding from the work vehicle (1) is formed. The seat (61) is placed on the upper and lower elastic members (67, 67). The seat portion (61) and the backrest portion (62) are formed by blow molding of synthetic resin, and the backrest notches that are recessed toward the center of the backrest portion (62) are formed on the left and right sides below the backrest portion (62). A seat notch (61m / 61m) that is recessed toward the center of the seat (61) on both the left and right sides of the seat (61) rear side. The notch (62c, 62c) and the seating notch (61m, 61m) constitute a substantially U-shaped recess (60a) from the seat (61) to the backrest (62) of the seat (60), The back notch portions (62c, 62c) and the seating notch portions (61m, 61m) are positioned on the seat (60) more than the support position of the left and right elastic members (67, 67) provided on the seating portion (61). and disposed on the left and right center side, A front recess (62d) that is recessed rearward is provided at the front upper portion of the backrest portion (62), and a rear recess (62e) that is recessed forward is provided at substantially the same height as the recess (62d) at the upper back. Both concave portions (62d, 62e) are extended in the left-right direction, and a pipe-shaped handrail portion (62f) is formed in the periphery .

  As effects of the present invention, the following effects can be obtained.

In the seat (60) of the work vehicle (1) having the work machine (17) on the rear side as defined in claim 1, the seat (60) includes a seating portion (61), a backrest portion (62), A connecting portion (63) for connecting the seating portion (61) and the backrest portion (62), wherein the connecting portion (63) has a substantially L-shaped plate in a side view as a central position of the seat (60); The seating portion (61) is fixed on the front and rear horizontal portions of the lower portion of the connecting portion (63), and the backrest portion (62) is fixed to the front surface of the upper and lower direction portion. (61) and the backrest part (62) are connected to each other by the connecting part (63), and the seat (60) is formed in a constricted shape and protrudes from the work vehicle (1) (55). The seating part (61) is mounted on the left and right elastic members (67, 67). The seat portion (61) and the backrest portion (62) are formed by blow molding of synthetic resin, and the backrest that is recessed toward the center of the backrest portion (62) on the left and right side portions below the backrest portion (62). Notch portions (62c and 62c) are provided, and seating notch portions (61m and 61m) that are recessed toward the center of the seating portion (61) are provided on the left and right side portions on the rear side of the seating portion (61). The back notch (62c / 62c) and the seat notch (61m / 61m) constitute a substantially U-shaped recess (60a) from the seat (61) to the back rest (62) of the seat (60). The seat back (60) has a backrest notch (62c, 62c) and a seating notch (61m, 61m) more than the support position of the pair of left and right elastic members (67, 67) provided in the seat (61). On the left and right center side of So Oite working machine of sheets provided in a working vehicle having a rear structure, such as a riding rice transplanter, while pilot is sitting on the seat, the rear and side from the state its attitude facing forward When changing to the facing state, the leg can be moved to the cutout portion of the backrest portion, so that the work can be performed on the work machine with the body firmly directed rearward, and workability is improved.

Further, a substantially U-shaped recess can be provided from the seating portion of the seat to the backrest portion. Thus, Oite a working machine such as a small riding rice transplanter in a sheet configuration which is provided in the working vehicle having the rear, the operator becomes possible to put easily leg recesses, while seated on the seat It becomes easy to change the posture from the state facing forward to the state facing backward or side.

Therefore, Oite the sheet structure provided in the working vehicle having a working machine, such as a riding rice transplanter rearward, the operator can perform such work towards a simple body in the seating state backward and sideways Workability is further improved.

  In addition, when the operator changes the posture backward while arranging the elastic member with a left and right width that can stabilize the seating portion so that the body does not tilt to the left and right while the pilot is seated on the seating portion. The leg can be easily put in the notch, and the body can be easily turned to the back or side.

  Further, since the seating part (61) and the backrest part (62) are formed by blow molding of synthetic resin, the weight of the seat and the cost can be reduced.

In addition, a front recess (62d) that is recessed backward is provided in the upper front portion of the backrest portion (62), and a rear recess (62e) that is recessed forward is provided at substantially the same height as the recess (62d) in the upper back portion. Provided, both concave portions (62d, 62e) are extended in the left-right direction, and a pipe-shaped handrail portion (62f) is formed around it so that the vicinity of the upper portion of the backrest portion can be easily grasped as a handrail portion so that the operator can You can support the body by grasping the handrail part or handrail part and the steering handle when changing the posture from the front facing state to the rear facing state or when getting on and off the traveling aircraft. .

  Next, embodiments of the invention will be described.

  FIG. 1 is a perspective view showing an overall configuration of a rice transplanter according to an embodiment of the present invention, and FIG. 2 is a perspective view of a traveling machine body.

  3 is a side view of the front part of the traveling machine body, FIG. 4 is a perspective view showing the structure of the tilt mechanism, FIG. 5 is a perspective view showing the structure of the posture holding means of the upper column, and FIG. 6 is a side view showing the tilt position of the steering handle. FIG. 7 is an upper perspective view of the traveling machine body.

  8 is a plan view of the rear portion of the vehicle body cover, FIG. 9 is a side sectional view of the rear portion of the vehicle body cover, FIG. 10 is a side view showing the seat support structure, and FIG. 11 is a perspective view showing the seat support structure.

  12 is a front view of the sheet, FIG. 14 is a rear view of the sheet, FIG. 15 is a plan view of the sheet, FIG. 16 is a bottom view of the sheet, and FIG. 17 is a side view of the sheet.

  In the present embodiment, the working vehicle is described as the riding rice transplanter 1, but this is not particularly limited, and a riding-type management machine or a tractor that can be steered from the front in a lowered state may be used. As shown in FIGS. 1 and 2, the rice transplanter 1 includes a traveling machine body 2 and a planting device 17 that is mounted on the rear portion of the traveling machine body 2 so as to be movable up and down. The traveling machine body 2 includes a main frame 3 composed of a pair of left and right frames mainly extending in the longitudinal direction of the body, and a mission case 4 composed of an integrated case body that is disposed between the left and right main frames 3 in the longitudinal direction of the body. And a transmission frame 5 that is connected to the transmission case 4 between the left and right main frames 3 and extends downward to the rear of the machine body.

  Front axle cases 6 project from left and right side surfaces of the transmission case 4 in the longitudinal direction of the vehicle body, and front wheels 7 are attached to both left and right ends of the front axle case 6. A rear axle case 8 is attached to the rear end portion of the transmission unit frame 5, and rear wheels 9 are attached to the left and right ends of the rear axle case 8. A pair of left and right support frames 10 are erected on the rear axle case 8, and a planting device 17 is connected to the support frame 10 via a parallel link mechanism including upper and lower links 11 and 12.

  The planting device 17 includes a pair of left and right transmission cases 13 that are connected to each other via a universal joint shaft and a PTO shaft that protrudes rearward from the rear end of the transmission case 4, and a traveling machine body 2. Mounted on the left and right sides of each planting transmission case 13, the seedling mount 14 arranged at the front height and rear low so that the upper end approaches the rear part, the float 15 disposed on the lower surface of each planting transmission case 13, and And a planting mechanism with planting claws that divide and plant one by one from the seedling mat on the seedling platform 14 while moving up and down between the farm scene and the lower end of the seedling platform 14. Yes. And the raising / lowering hydraulic cylinder 16 provided in the rear end of the main frame 3 is attached in relation to the upper and lower links 11 and 12, and the planting device 17 can be raised and lowered with respect to the traveling machine body 2. .

  A vehicle body cover 50 is attached to the main frame 3 so as to cover the traveling machine body 2 from above, and a seat 60 is disposed above the vehicle body cover 50. A front bonnet (engine hood) 20 is disposed in front of the seat 60 and is fixed to the upper surface of the front portion of the vehicle body cover 50. Spare seedling stands 18 are arranged on the left and right sides of the front bonnet 20, and as shown in FIG. 3, in the front bonnet 20, the engine 21 and its accessories are disposed on the rear side thereof, such as a carburetor and speed governor. A machine, an air muffler, a starter coiler (rope starter), a silencer, and the like are arranged. Above the engine 21, a fuel tank 22 is fixedly disposed on a frame erected from the engine 21.

  A mission case 4 is disposed below the engine 21. The mission case 4 includes a steering drive mechanism 23 for steering on the front side and a power transmission mechanism for transmitting power to the travel drive system and the PTO drive system on the rear side. In addition, a cylindrical lower column 24 is erected on the front end side of the upper surface of the mission case 4, and a steering lower shaft 25 is disposed in the lower column 24 as shown in FIG. 4 is connected to a steering drive mechanism 23 in the interior. On the other hand, the upper end of the steering lower shaft 25 is connected to the lower end of a handle shaft 27 having a steering handle 26 attached to the upper end so as to be bent. The handle shaft 27 is disposed in a cylindrical upper column 28.

  The upper end of the lower column 24 and the lower end of the upper column 28 are connected via a tilt mechanism 30 so as to be able to tilt forward and backward, and the inclination angle of the upper column 28 is held at the outer periphery of the tilt mechanism 30 in a plurality of stages. Posture holding means 31 is provided. As shown in FIG. 5, the tilt mechanism 30 laterally moves a pair of left and right lower brackets 32 fixed to the upper end of the lower column 24 and a pair of left and right upper brackets 33 fixed to the outer periphery of the lower end of the upper column 28. It is configured to be pivotally connected via a pivot 34.

  The posture holding means 31 includes a plurality of (three in this embodiment) locking grooves 32a, 32b, and 32c formed in a concave shape at positions appropriately separated from each other on the eccentric arc-shaped upper end surface of the lower bracket 32, and A horizontal shaft 35 pivotally supported by the rear end piece 33a of the upper bracket 33, an engagement hook 36 fixed to one end of the horizontal shaft 35, and an urging force for downwardly biasing the engagement hook 36 When the upper column 28 is changed to a predetermined rearward or forward inclination angle, the engagement hook 36 is selected as any one of the plurality of locking grooves 32a, 32b, and 32c. By being engaged, the tilting posture of the upper column 28 can be adjusted and maintained.

  As shown in FIG. 6, in the present embodiment, the upper column 28 moves back and forth, and the posture thereof is inclined rearward of the traveling machine body 2 (inclined approximately 30 degrees clockwise relative to the vertical line). A posture I, a second posture II tilted forward in front of the traveling vehicle body 2 approximately 60 degrees in the counterclockwise direction from the first posture, and a large amount approximately forward 88 degrees in the counterclockwise direction from the first posture. It can be selectively changed to the third posture III inclined forward. When the upper column 28 is in the first posture I, the engagement hook 36 is engaged with the rearmost locking groove 32a of the upper surface of the lower bracket 32, and the upper column 28 is in the second posture II. The engaging hook 36 is engaged with the locking groove 32b at the front and rear center position. In the case of the third posture III, the engagement hook 36 is engaged with the front engagement groove 32c.

  In addition, an opening 20a having a substantially U shape in plan view is provided from the upper surface side to the front end of the front bonnet 20 that covers the tilt mechanism 30 from the upper surface side to the front end. The opening 20a is covered with a movable cover body 40 that moves back and forth integrally with the upper column 28, and an auxiliary cover body 41 as an exterior product connected to the movable cover body 40 so as to be rotatable upward. . The auxiliary cover body 41 is provided so as to be rotatable up and down around the front end side of the movable cover body 40. That is, a support pipe 43 is fixed laterally at the tip of a support bracket member 42 that protrudes upward from the lower portion of the upper column 28, while a reinforcement-use operation that is bent and formed in a U-shape on the back surface of the auxiliary cover body 41. The member 44 is fixed, and a pair of left and right shaft portions 44a of the operation member 44 are rotatably inserted into both ends of the support pipe 43 so that the auxiliary cover body 41 can be turned up and down around the shaft portion 44a. Has been.

  The operation member 44 is associated as an operation unit of the posture holding means 31. That is, a pin 44b protrudes from the shaft 44a of the operation member 44 at an eccentric position, and one end of the link 46 is rotatably connected to the pin 44b, while the other end of the link 46 is connected to the engagement hook 36. Is pivotally connected to the tip of an arm 47 fixed to the other end of the horizontal shaft 35 that rotates integrally with the horizontal axis 35. Thus, the operating member 44, that is, the lower end side of the auxiliary cover body 41 is urged by the urging force of the urging spring 37 so as to approach the surface of the front bonnet 20.

  Thus, when the lower ends of the auxiliary cover body 41 and the operation member 44 are rotated upward by a predetermined angle so as to be separated from the surface of the front bonnet 20, the link 46 and the arm 47 are resisted against the biasing force of the biasing spring 37. The tip of the engagement hook 36 is rotated so as to be disengaged from the locking grooves 32a, 32b, and 32c, and the engagement state between the engagement hook 36 and the locking grooves 32a, 32b, and 32c is released. Subsequently, in a state where the hand is released from the auxiliary cover body 41 (a state where the inner surface of the lower end side of the auxiliary cover body 41 is in sliding contact with the outer edge of the opening 20a of the front bonnet 20), the operator holds the steering handle 26. By rotating, the upper column 28 can be shifted to an arbitrary posture.

  Accordingly, the upper column is selectively bent in the front-rear direction by the tilt mechanism, and the steering handle (round handle) 26 at the upper end of the upper column 28 is moved to the rear position toward the seat 60 and the front position in front of the traveling machine body 2. Since the steering handle 26 is set at the front position, the driver who gets off the traveling machine body 2 holds the steering type rice transplanter 1 in the field while holding the steering handle 26 while being positioned in front of the traveling machine body 2. It is possible to perform operations such as crossing over from the top or placing it on a track. Further, by setting the steering handle 26 to the rear position, the driver can steer the riding type rice transplanter 1 while riding on the traveling machine body 2.

  Further, as shown in FIG. 7, the vehicle body cover 50 has left and right front steps 50a and 50a on the left and right sides of the front bonnet 20, a rear step 50b on the rear side of the seat 60, and front steps 50a and 50a and rear steps. The middle step 50c is provided between the first step 50b and the second step 50b. The rear step 50b is connected to the middle step 50c by a connecting portion 50d that rises rearward and upward from the middle step 50c, and the left and right sides of the connecting portion 50d are fenders for the rear wheels 9,9. Here, the vehicle body cover 50 is integrally formed of a synthetic resin by injection molding, and the weight reduction, the number of parts are reduced, and the workability during assembly is improved.

  In the vehicle body cover 50, openings (or notches) 50e and 50e are provided in the vicinity of the front wheels 7 and 7 of the left and right front steps 50a and 50a. Each opening 50e is arranged above the front wheel 7 of the front step 50a and on the inner side of the front wheel 7 while the operator getting off the traveling machine body 2 is positioned in front of the traveling machine body 2, As described above, when the steering handle 26 is rotated and operated by the tilt mechanism 30 to the front position in front of the machine body, the rear part of the front wheels 7 and 7 can be visually recognized, and its right and left direction and position and its surroundings It is configured so that the state and the like can be confirmed. At the same time, each opening 50e allows the front part of the front wheel 7 to be visually recognized when the operator is positioned on the traveling machine body 2, and confirms the direction and position in the left-right direction and the state of the periphery thereof. It is configured to be able to.

  In the present embodiment, the opening portions 50e and 50e are arranged such that the outer peripheral portions of the left and right front steps 50a and 50a are located almost directly above the front wheels 7 and 7, and thus the outer peripheries of the front steps 50a and 50a. The portion is cut into a substantially V shape in plan view so as to taper from the outside to the inside. As a result, the opening area of the openings 50e and 50e provided in the front part of the vehicle body cover 50 is minimized, and the fender function for the front wheels 7 and 7 in the front steps 50a and 50a, so-called mud splash, is prevented. It is possible to prevent the function from being impaired. Further, even when the front wheels 7 and 7 face in either one of the left and right directions, the front part or the rear part of the front wheels 7 and 7 can be seen reliably, so that the visibility is improved.

  8 and 9, openings 50f and 50f are also provided in the vicinity of the left and right rear wheels 9 and 9 of the middle step 50c. The left and right openings 50f and 50f are arranged in front of the rear wheels 9 and 9 in the middle step 50c, in the left and right directions with respect to the rear wheels 9 and 9, and the driver who has descended from the traveling body 2 The front part of the rear wheels 9 and 9 can be visually recognized when the steering handle 26 is rotated to the front position in front of the body by the tilt mechanism 30 as described above while being positioned in front of the traveling body 2. The horizontal direction and position and the surrounding state can be confirmed.

  The openings 50f and 50f are formed in a substantially triangular shape in plan view so as to taper from the rear side to the front side of the machine body, and include slits 50g and 50g at predetermined intervals in the front-rear direction, and are configured in a slit shape. Has been. That is, the openings 50f and 50f are formed so that the opening area is larger toward the rear, and the opening is formed so that the opening is expanded in the left and right inner sides of the body, and the rear opening 50f is located below both sides of the seat 60. It is possible to look into the vicinity of the rear wheel just by facing the lower side while the operator is seated. Further, the strength is ensured by making the width of the middle step 50c outside the openings 50f and 50f substantially constant.

  The bulkheads 50g and 50g are inclined forwardly and rearwardly in the middle step 50c so as to be substantially parallel to the line of sight of the rear wheels 9 and 9 of the operator who operates the steering handle 26 and is positioned in front of the traveling body 2. It is integrally molded in the state. Therefore, in the openings 50f and 50f, the inclination direction of the partition walls 50g and 50g intersects (substantially orthogonal) with the direction in which the rear wheels 7 and 7 splash mud toward the openings 50f and 50f. The mud from 9 and 9 is prevented from passing through the openings 50f and 50f by the partition walls 50g and 50g, and the mud splashing up to the upper surface of the middle step 50c is prevented. In addition, the rear wheel 9 is easily visible.

  In this way, when the operator performs an operation from the front of the body with the operator getting off the traveling body, the direction and position of the front wheels 7 and 7 or the rear wheels 9 and 9 are visually recognized. Since the opening that can be used is provided, the steering operation can be performed with the steering handle 26 while confirming the turning angle of the front wheels 7 and 7 or the rear wheels 9 and 9, and the operability is improved. Further, even when the operator is on the steering body, the steering operation can be performed with the steering handle 26 while confirming the turning angle of the front wheels 7 and 7, and the operability is improved.

  Further, a plurality of slip stoppers 50h, 50h,... Are provided between the left and right openings 50f, 50f on the upper surface of the middle step 50c. The slip stoppers 50h, 50h,... Are formed in a circular arc shape in plan view, are located on a concentric circle having a center behind the seat 60, and are disposed so as to spread forward from the rear end of the middle step 50c. In this way, the non-slip 50h, 50h, etc. become non-slip when moving up and down from the front or side of the step or when moving, centering on the buttocks while kicking with the foot while sitting on the seedling joint etc. It prevents the back of the shoe from getting caught when turning to the left or right.

  The left and right ends of the anti-skids 50h, 50h,... Are extended to the vicinity of the drain holes 50j, 50j provided on the left and right rear sides of the openings 50f, 50f or the middle step 50c, and the middle step 50c. Rain that has fallen above, mud or water that has been brought in flows along the anti-slip, and flows down from the openings 50f and 50f or the drain holes 50j and 50j. Similar slip stoppers are provided in the previous steps 50a and 50a.

  A pair of left and right openings are also provided at the left and right center of the connecting portion 50d between the rear step 50b and the middle step 50c of the vehicle body cover 50. As shown in FIGS. A sheet support stay 55 that is substantially U-shaped in plan view is projected toward the top. The seat support stay 55 is for supporting the seat 60 and is bent in a letter shape when viewed from the side. The left and right rear ends of the seat support stay 55 are below the rear step 50b, and the upper and lower links of the link mechanism. It is fixed to the support frame 10 which supports 11 * 12. And the front part of the sheet | seat support stay 55 is arrange | positioned substantially parallel above the middle step 50c, and the sheet | seat 60 is supported on it.

  That is, by supporting the seat support stay 55 that supports the seat 60 on the opposite side of the support frame 10 with respect to the upper and lower links 11 and 12, when the operator is seated on the seat 60, The moment applied to the front and lower sides of the support frame 10 and the moment applied to the rear and lower sides of the support frame 10 due to the weight of the planting device 17 are balanced. Thereby, the rigidity of the support frame 10 may be smaller than the configuration in which the planting device 17 is supported by the support frame 10 like a cantilever, and the size and weight of the support frame 10 itself are reduced to reduce the cost. be able to.

  Further, by supporting the seat 60 on the seat support stay 55 projecting obliquely forward and upward from the connecting portion 50d of the vehicle body cover 50, a space 56 is formed below the middle step 50c and the seat 60, and the seat 60 is formed in the space 56. It is configured so that a driver in a seated state can place his / her foot. Therefore, in order to perform operations such as replenishing seedlings to the seedling stage 14 of the planting device 17 from the preliminary seedling stage 18 while the operator is seated on the seat 60, the operator moves the posture from the front side to the rear side. In the case of changing to the state of facing, the foot can be placed in the space 56 below the seat to firmly support the body, and the workability can be improved.

  A space continuous with the space 56 below the seat 60 is formed on the middle step 50c between the seat 60 and the front bonnet 20 and on the middle step 50c on the left and right sides of the seat 60. 56 is configured to allow the operator to place his / her foot. As a result, the driver can freely place his / her feet not only on the front side of the seat 60 but also on the middle step 50c on both the left and right sides, so that the body can be firmly supported even in a posture facing backward. The workability when performing seedling replenishment work can be improved.

  Further, as shown in FIGS. 12 to 17, the seat 60 includes a seating portion 61, a backrest portion 62, and a connecting portion 63 that connects the seating portion 61 and the backrest portion 62. The connecting portion 63 is formed in a substantially L shape in a side view, and fixes the seat portion 61 on the front and rear horizontal portions below the connecting portion 63, while fixing the backrest portion 62 on the front surface of the upper vertical direction portion. 60 is configured. Here, the seat part 61 and the backrest part 62 are formed by blow molding with synthetic resin or the like, so that weight reduction and cost reduction of the seat 60 are achieved.

  The seat 60 is provided with a recessed portion 61a that is recessed downward in the center of the upper surface of the seating portion 61, and a cushion 65 having elasticity is attached to the recessed portion 61a, so that an impact from the seating portion 61 on the seated operator is prevented. It is configured to absorb. The mounting recess 61a of the cushion 65 is provided with a pair of left and right front recesses 61b and 61b and a pair of left and right rear recesses 61c and 61c that are compressed to form a compression portion. It has been. The front recesses 61b and 61b are respectively provided with fixing holes 61d and 61d and draining holes 61e and 61e, and the rear recesses 61c and 61c are fixed downward. Holes 61f and 61f and drain holes 61g and 61g are formed, respectively.

  A bracket 66 is fixed to the front concave portions 61b and 61b via fixing holes 61d and 61d, and an elastic member 67 is fixed to the rear concave portions 61c and 61c via fixing holes 61f and 61f. 10 and 11, the bracket 66 is fixed on the seat support stay 55, the elastic member 67 is placed on the seat support stay 55, and the seat 60 is covered with the vehicle body cover as described above. Above 50, it is arranged with a space 56 in which the operator can place his feet. In the seating portion 61, rainwater and the like are drained from the drain holes 61e and 61g of the recesses 61b and 61c, so that the water does not easily accumulate in the recesses 61a, 61b, and 61c.

  The recessed portion 61a of the seat portion 61 is further provided with a central recessed portion 61h that is recessed downward between the left and right rear recessed portions 61c and 61c. Fixing holes 61j and 61j and water draining holes 61k penetrating downward in the central recess are drilled, and the lower end portion of the connecting portion 63 is fixed from below through the fixing holes 61j and 61j. Further, a lower concave portion 62a that is recessed rearward is also provided at the lower front portion of the backrest portion 62, and fixing holes 62b and 62b are formed in the concave portion 62a. Then, the connecting portion 63 fixed to the central recessed portion 61h of the seating portion 61 extends upward from the bottom surface of the seating portion 61 along the rear end surface, and the upper end portion of the connecting portion 63 extends to the lower recessed portion 62a of the backrest portion 62. It is fixed via fixing holes 62b and 62b. Thus, the seat portion 61 and the backrest portion 62 are connected, and the seat 60 is constricted by the connecting portion 63.

  Further, the seating portion 61 is formed in a substantially elliptical shape in plan view, and is arranged so that the maximum diameter portion faces the left-right direction of the body. Curved seating cutout portions 61m and 61m are provided between the maximum diameter portions on both the left and right sides of the seating portion 61 and the rear end portions that slightly protrude rearward, and are recessed from the outer periphery toward the front, rear, left and right centers of the seating portion 61. The rear end portion is tapered toward the connecting portion 63 so as to become narrower in plan view. The seating notches 61m and 61m are sized so that the legs (hooks) can be easily inserted in a state where the operator is seated on the seating portion 61 with the body facing rearward or laterally. As a result, the operator faces the front in order to perform operations such as replenishing seedlings from the preliminary seedling stage 18 to the seedling stage 14 of the planting device 17 while sitting on the seat 61. The leg can be moved to the notch 61m along the outer periphery of the seating portion 61 when changing from the rear to the rear or sideward, so that the angle toward the rear may be larger than the conventional angle. It is possible to work with the body firmly facing backwards. As a result, the work becomes easier and workability is improved.

  Further, curved backrest notches 62c and 62c are provided between the upper and lower midway portions on the left and right sides of the backrest portion 62 and the lower end portions so as to be recessed from the outer periphery of the backrest portion 62 toward the vertical and horizontal centers, and the lower end portions are connected. It is formed in a tapered shape so as to narrow toward the portion 63 in front view. The notches 62c and 62c are sized so that the legs (thick thighs) can be easily inserted in a state in which the operator is seated on the seat 61 with the body rearward or sideward. As a result, in the same manner as described above, the operator turns the posture forward in order to perform operations such as replenishing seedlings to the seedling stage 14 of the planting device 17 from the preliminary seedling stage 18 while sitting on the seating portion. The leg can be moved to the back notch part 62c and 62c of the backrest part 62 when changing from the sitting state to the rearward or sideward state, so that the body can be firmly turned rearward. It becomes. As a result, the work becomes easier and workability is improved.

  Therefore, in order to obtain the above-described effect, it is only necessary to provide the notches 61m and 62c in at least one of the seat 61 or the backrest 62. However, as shown in the present embodiment, the seat 61 and the backrest 62 are not provided. The notches 61m and 62c are arranged so as to face each other between them, and a substantially U-shaped recess 60a is provided from the seating portion 61 to the backrest portion 62 of the seat 60, so that the operator can easily place the leg in the recess 60a. The posture can be easily changed from a state of facing forward to a state of facing rearward or sideward while sitting on the seating portion 61. Therefore, the operator can easily work with the body facing backward or sideward in the sitting state, and the workability is further improved.

  Further, the left and right cutout portions 61m and 62c of the seat portion 61 and the backrest portion 62 are provided so as to be recessed to the left and right center side of the seat from the support position of the left and right elastic members 67 that support the seat portion 61, respectively. As a result, the operator changes the posture backward while arranging the elastic member with a lateral width sufficient to stabilize the seating portion 61 so that the body does not tilt to the left and right in a state where the pilot is seated on the seating portion. At this time, the legs can be easily put in the notches 61m and 62c, and the body can be easily directed rearward or sideward.

  In addition, the backrest 62 is provided with a recessed portion 62d that is recessed rearward at the upper front portion, and a recessed portion 62e that is recessed forward at substantially the same height as the recessed portion 62d at the upper rear surface. And each recessed part 62d * 62e is extended in the left-right direction, and the pipe-shaped handrail part 62f is formed in the circumference | surroundings of this recessed part 62d * 62e. That is, the pipe-shaped handrail portion 62f is formed so that the periphery of the backrest portion 62 can be gripped by a hand. In this way, the backrest part 62 makes it easy to grasp the vicinity of the upper part as the handrail part 62f, and when the operator is seated on the seating part 61, the posture is changed from the front-facing state to the rear-facing state, When getting on and off the airframe, the handrail portion 62f or the handrail portion 62f and the steering handle 26 are grasped to support the body. In addition, the recessed parts 62d and 62e of the backrest part 62 are good also as only one of a front surface or a back surface, and it is good also as a perforation, In these cases, the same effect as the above can be acquired.

  Further, as shown in FIG. 8, on the left and right sides of the seat 60, a control operation tool 70 that controls the planting depth of the seedling by the planting device 17 is disposed in the vicinity of the notch 61 m provided in the seat 61. Has been. The operating tool 70 is configured as a sensitivity lever that changes the reference of the movable range of the sensor float for detection, for example, and protrudes forward from the opening 50k provided in the connecting portion 50d of the vehicle body cover 50. The gripping portion is provided behind the maximum diameter portion of the seating portion 61 so as to be positioned on the left and right center side of the seat.

  Therefore, for the operator who is seated on the seating portion 61 of the seat 60, the position of the planting depth control operation tool 70 is easily accessible, and the notch 61m of the seating portion 61 allows the planting depth to be adjusted. A hand can be extended without interfering with the seating portion 61 toward the control operation tool 70, and operability is improved. Moreover, the control operation tool 70 of the planting depth can be efficiently arranged in a limited space near the seat 60, and the airframe can be made compact.

  Further, since the planting depth control operation tool 70 is arranged on the seat left and right center side with respect to the maximum diameter portion of the seating portion 61, when the operator walks on the vehicle body cover 50, the seating operation is performed. Since the maximum diameter portion of the portion 61 is avoided and the outside of the seat 60 is walked, it is difficult for the operator's leg to hit the control operating tool 70 at the planting depth, thereby preventing erroneous operation or damage of the operating tool 70. it can.

The perspective view which showed the whole structure of the rice transplanter which concerns on one Example of this invention. The perspective view of a traveling body. The side view of a traveling machine body front part. The perspective view which shows the structure of a tilt mechanism. The perspective view which shows the structure of the attitude | position holding means of an upper column. The side view which shows the tilt position of a steering handle. The upper perspective view of a traveling body. The top view of a vehicle body cover rear part. Side surface sectional drawing of a vehicle body cover rear part. The side view which shows the support structure of a sheet | seat. The perspective view which shows the support structure of a sheet | seat. The perspective view of a sheet | seat. The front view of a sheet | seat. The rear view of a sheet | seat. The top view of a sheet | seat. The bottom view of a sheet | seat. The side view of a sheet | seat.

1 Rice transplanter (work vehicle)
17 Planting device (work machine)
60 seat 61 seating part 61m / 61m seating notch part 62 backrest part 62c / 62c backrest notch part 62d recessed part 62e recessed part 67 elastic member

Claims (1)

In the seat (60) of the work vehicle (1) having the work machine (17) on the rear side, the seat (60) includes a seating portion (61), a backrest portion (62), and the seating portion (61). A connecting portion (63) for connecting the portion (62), the connecting portion (63) is formed by disposing a substantially L-shaped plate in a side view at a central position of the sheet (60) , The seating part (61) is fixed on the front and rear horizontal parts at the lower part of the connecting part (63), while the backrest part (62) is fixed to the front face of the upper part in the vertical direction, and the seating part (61) and the backrest part (62 ) Are connected by a connecting portion (63), the seat (60) is formed in a constricted shape, and a pair of left and right is placed on a seat support stay (55) protruding from the work vehicle (1). The seat portion (61) is placed via the elastic member (67, 67), and the seat portion (61) The backrest portion (62) is formed by blow molding of synthetic resin, and the backrest notch portions (62c, 62c) that are recessed toward the center of the backrest portion (62) are formed on the left and right side portions below the backrest portion (62). In addition, provided on both the left and right sides of the rear of the seating portion (61) are seating notch portions (61m and 61m) that are recessed toward the center of the seating portion (61), and the backrest notch portions (62c and 62c). And the seating notch (61m / 61m) constitute a substantially U-shaped recess (60a) from the seating part (61) to the backrest (62) of the seat (60), and the backrest notch (62c 62c) and the seating notches (61m and 61m) are arranged on the left and right center side of the seat (60) from the support position of the pair of left and right elastic members (67 and 67) provided on the seating part (61), The backrest (62 A front concave portion (62d) that is recessed rearward is provided at the upper front portion of the front surface, and a rear concave portion (62e) that is recessed forward is provided at substantially the same height as the concave portion (62d) at the upper portion of the rear surface. ) In the left-right direction, and a pipe-shaped handrail portion (62f) is formed around the seat.

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