JP2008017800A - Lawn mower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lawn mower enabling easy discharge of mowed grass from a grass collector to a container or a loading platform of a truck and, nevertheless, preventing the turnover of a traveling body. <P>SOLUTION: The lawn mower is provided with a mower device 16 mounted on a traveling body 1, a grass collection member 30 to collect grass mowed by the mower device 16 and a lifting mechanism 31 to support the grass collection member 30 on the traveling body 1 in a liftable manner, and the mowed grass in the grass collection member 30 is discharged by lifting the grass collection member 30 with the lifting mechanism 31. The lawn mower is further provided with supporting legs 132 to prevent the turnover of the traveling body 1. The supporting legs 132 are connected to the lifting mechanism 31 and moved toward the ground by the lifting motion of the grass collection member 30 and separated from the ground according to the lowering motion of the grass collection member 30. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lawn mower provided with a mower device for cutting turf grass planted on the ground and a grass collecting body for collecting grass cut by the mower device, and more specifically, a lift mechanism is provided on a traveling machine body. It is related with the lawn mower which equipped the grassy body so that raising / lowering was possible.

  Conventionally, in general, a lawn mower has a mower device with a rotary cutting blade mounted on a traveling machine body so as to be movable up and down, a substantially cylindrical discharge duct extending rearward from the mower device, and a box-like shape communicating with the discharge duct. The grass turf and the like are continuously cut by the mower device, and the turf grass such as turf grass is discharged from the mower device to the grass collector through the discharge duct.

In this case, in the conventional lawn mower, when the grass cut in the grass collection unit is full, the grass collection unit is lifted above the container or truck bed, and the grass cut in the container or truck is discharged. The structure which does is adopted (for example, refer patent document 1).
JP 2002-84850 A

  By the way, in Patent Document 1, when a grassy body that is full of mowing grass is lifted, the lawn mower has an unstable posture in which the center of gravity is high and the tipping over easily occurs. In particular, there is a problem that the traveling machine body falls on a place where the road surface is soft or an inclined place.

  An object of the present invention is to provide a lawn mower capable of easily discharging the cut grass in the grass collection body to a container or a truck bed or the like while preventing the traveling machine body from falling.

  In order to achieve the above object, a lawn mower according to a first aspect of the present invention includes a mower device mounted on a traveling machine body, a grass collecting body for collecting grass cut by the mower apparatus, and the grass collecting body on the traveling machine body. A lawn mower configured to lift the grass collection body by the lift mechanism to discharge the cut grass in the grass collection body, and to prevent the traveling machine body from overturning. The support leg is connected to the lift mechanism, and the support leg is moved closer to the landing direction by the lifting operation of the grass collection body, while the support is supported by the lowering operation of the grass collection body. The leg is configured to move apart in the ground direction.

  According to a second aspect of the present invention, in the lawn mower according to the first aspect, the lawn mower includes a lock mechanism that holds the support leg in a landing posture, and the lock mechanism is attached to the support leg by the raising operation of the grass collecting body. It is configured to be locked.

  According to a third aspect of the present invention, in the lawn mower according to the second aspect, after the support leg moves closer to the landing direction by the raising operation of the grass collection body, the grass collection body further moves up, The lock mechanism is configured to be engaged with the support leg.

  According to a fourth aspect of the present invention, in the lawn mower according to the second or third aspect, after the lock mechanism is detached from the support leg body by the lowering operation of the grass collection body, the grass collection body is further lowered. Thus, the support leg is configured to be separated from the landing surface.

  According to a fifth aspect of the present invention, in the lawn mower according to the first aspect, the lift mechanism supports the grass collection body so as to be movable up and down, and the lift mechanism supports the grass collection body so as to roll. A lawnmower comprising a dumping means, a brake operating body that brakes a traveling portion of the traveling machine body, an elevating operation body that operates the lift means, and a rolling operation body that operates the dump means. And a permission control means for detecting the braking operation of the brake operation body and allowing the operation of the lifting operation body and the operation of the rolling operation body, respectively.

  According to the invention which concerns on Claim 1, the mower apparatus mounted in the traveling body, the grass collection body which collects the grass cut by the mower apparatus, and the lift mechanism which supports the grass collection body so that the traveling body can be moved up and down A lawn mower configured to lift the grass collection body by the lift mechanism and discharge the cut grass in the grass collection body, the support mechanism for preventing the traveling machine body from overturning, and the lift mechanism The support legs are connected to each other, and the support legs are moved closer to the landing direction by the raising operation of the grass collection body, while the support legs are moved apart in the ground direction by the lowering operation of the grass collection body. Since the traveling aircraft body is supported on the ground via the support legs and the traveling aircraft body is maintained in a stable posture, the height of the container or the loading platform of the truck is set. Sotai can easily lift things, possible to prevent tipping of the traveling machine body. Further, in connection with the operation of lifting the grass collection body, the support leg automatically advances (moves toward the landing), so that the support leg is retracted (moved away from the landing). , It is possible to prevent the discharge work of turfgrass and the like in the grass collection body from being performed. In addition, the support leg automatically moves away in association with the operation of returning the grass collection body to the grass collection work position of the traveling machine body. For example, the support leg advances in the landing direction (approaching the landing). It is possible to prevent the turf grass cutting operation from being resumed. In other words, it is possible to save the operator's trouble of moving the support leg toward the landing (advancing) or moving away from the landing (retreating), thereby improving the workability of discharging the grass cut in the grass collection body. It can be done.

  According to a second aspect of the present invention, there is provided a lock mechanism that holds the support leg in a landing posture, and is configured such that the lock mechanism is locked to the support leg by the raising operation of the grass collecting body. Therefore, when the grass collection body is lifted to a discharge height such as turfgrass, the support leg can be automatically locked in the landing posture by the lock mechanism. It is possible to save the operator's trouble of locking the support leg to the landing posture, eliminate the operator from forgetting to lock the support leg, and improve the lifting performance of the grass collection body.

  According to the invention of claim 3, after the support leg is moved closer to the landing direction by the lifting operation of the grass collection body, the grass collection body is further lifted to move the lock mechanism to the support leg. Since it is configured to be locked, the support leg is locked by the lock mechanism before the support leg shifts from the retracted position separated from the landing surface to the landing position. Can be prevented. The support leg can always be locked in the landing posture by the lock mechanism, and the grass collection body can be lifted.

  According to the invention which concerns on Claim 4, after the said locking mechanism detaches | leaves from the said supporting leg body by the downward operation | movement of the said grass collecting body, the said grass collecting body further carries out the downward operation | movement, so that the said supporting leg body is from landing. Since the support legs are configured to move away from each other, the support legs are separated from the landing surface by the descending operation of the grass collection body until the support legs are unlocked in the landing posture. It is possible to prevent the support leg and the like from being damaged by being retracted. The operator can forget the unlocking of the support leg and the like, and always return the support leg to the retracted position away from the landing surface, so that the cutting work of turf grass and the like can be resumed.

  According to the invention which concerns on Claim 5, the said lift mechanism supports the said grass collection body so that raising / lowering is possible, The dump means which supports the said grass collection body so that rolling is possible on the said lift mechanism, Travel of the said traveling body A lawn mower comprising: a brake operating body that brakes a portion; a lifting operation body that operates the lift means; and a rolling operation body that operates the dump means. Since it is provided with permission control means for detecting and allowing the operation of the lifting operation body and the operation of the rolling operation body respectively, the lift means or the dump truck is in a state where the operator forcibly brakes the traveling portion. Each means can be operated, erroneous operation of the lifting and lowering operation body or the rolling operation body can be reduced, and the contents in the container can be easily prevented from being discharged to an unexpected place.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described with reference to the drawings. 1 is a side view of a lawn mower, FIG. 2 is a plan view of the lawn mower, FIG. 3 is a side view showing a rear part and a grass collecting body of a traveling machine body, FIG. 4 is a rear view showing a lift mechanism, and FIG. 5 is a lift of FIG. FIG. 6 is a side view showing the discharge of the cut grass of the grass collection body. As shown in FIGS. 1 and 2, in the lawn mower of this embodiment, the traveling machine body 1 includes left and right machine body frames 3, 4 that are integrally connected via a plurality of horizontal rail frames (not shown). I have. The body frames 3 and 4 are supported by left and right front wheels 5 and left and right rear wheels 6 arranged in front and rear of the left and right sides.

  An engine 9 as a power source is built in the hood 8 on the upper side of the front cowl 7 that covers the front upper surface of the traveling machine body 1. A steering column portion 11 having a round steering handle 10 is mounted on the upper side of the rear portion of the bonnet 8. A shift pedal 12 for appropriately adjusting the vehicle speed and a brake pedal 13 for braking the traveling machine body 1 are disposed below the right side in the traveling direction of the steering column unit 11.

  A driver seat 15 is provided on the rear cowl 14 that covers the rear upper surface of the traveling machine body 1. When the operator sitting on the driver's seat 15 rotates the steering handle 10, the hydraulic torque generator 2 for power steering is operated according to the operation amount (rotation amount), and the left and right front wheels 5 are operated. The steering angle (steering angle) is changed. On the left side of the driver's seat 15, a mower elevating lever 17 for elevating and lowering a mower device 16 described later is provided so as to be able to rotate back and forth. A PTO clutch lever 18 for driving or stopping the mower device 16 is provided on the right side of the driver seat 15 so as to be able to rotate back and forth.

  In the rear cowl 14, a mission case 19 having a hydrostatic continuously variable transmission 95 (HST type), which will be described later, is disposed. An inclined portion having a front, low, rear, and high shape is formed at the rear of the body frames 3 and 4, and the mission case 19 is supported at an intermediate portion of the front and rear width of the inclined portions of the body frames 3 and 4. The mission case 19 is configured to transmit power from the engine 9 to the left and right rear wheels 6 by appropriately shifting power from the engine case 19. A fuel tank 20 that supplies fuel to the engine 9 is mounted at the rear end of the inclined portion of the body frames 3 and 4. An oil tank 21 that supplies hydraulic oil to the hydrostatic continuously variable transmission 95 of the mission case 19 is mounted outside the inclined portion of the right body frame 4. On the side opposite to the oil tank 21, a battery 22 used for starting the engine 9 is mounted outside the inclined portion of the left body frame 3 so as to sandwich the fuel tank 20.

  A mower device 16 for lawn mowing is mounted on the lower surface of the body frame 2 between the left and right front wheels 5 and the left and right rear wheels 6 through a front and rear link rods 23 and 24. . The mower device 16 includes a pair of left and right rotary cutting blades 26 that can be rotated horizontally in a mower case 25 having a downward-opening hook shape. Further, four front and rear gauge wheels 27 that adjust the height of the mower device 16 when lowered are attached to the front and rear sides of the left and right sides of the mower case 25. A duct portion 28 that opens rearward is provided on the upper surface of the mower case 25.

  The duct portion 28 communicates with the front side of the discharge duct 29 disposed between the left and right rear wheels 6 on the lower surfaces of the body frames 3 and 4. Further, the rear side of the discharge duct 29 is connected to a grass collection box 30 as a grass collection body. The grass collection box 30 is formed by stretching a mesh sheet into a box shape. A grass collection box 30 is supported by a lift mechanism 31 disposed at the rear of the traveling machine body 1 so as to be movable up and down. Mowed grass such as turf grass cut by the rotary cutting blade 26 in the mower case 25 is conveyed from the duct portion 28 to the inside of the grass collection box 30 through the discharge duct 29 by the wind of the rotary cutting blade. The cut grass is collected in the grass collection box 30.

  Next, the power transmission system of the lawn mower will be described with reference to FIGS. 1 and 2. In the lawn mower of this embodiment, a two-wheel drive system is adopted in which a part of the rotational power of the engine 9 is distributed to the left and right rear wheels 6. That is, a part of the rotational power of the engine 9 is forward from the rear end portion of the output shaft 32 protruding forward and backward outward from the engine 9 and the propulsion shaft 33 having universal joints at both front and rear ends and the transmission case 19. Is transmitted to the transmission case 19 via the traveling transmission relay case 34 and the endless input belt 35 disposed in the region. The left and right axles 38 provided at the rear side portion of the traveling machine body 1 through the left and right endless rear wheel drive chains 37 from the horizontal left and right rear wheel drive shafts 36 projecting left and right outward from the transmission case 19. Is transmitted to. As a result, the left and right rear wheels 6 attached to the left and right axles 38 are rotationally driven. Left and right axle frames 39 are respectively provided at rear portions of the left and right body frames 3 and 4, and left and right axles 38 are disposed on the left and right axle frames 39. The discharge duct 29 extends between the left and right axle frames 39 in the front-rear direction.

  As shown in FIG. 1, the cut turf grass is transported between a mower device 16 as a mowing unit disposed on the lower surface side of the traveling machine body 1 and a grass collection box 30 disposed behind the traveling machine body 1. For this purpose, the transmission case 29 is extended to the front, lower, and rear high above the discharge duct 29 to support the transmission case 19 so that the transmission case 19 is inclined to the front low and high. Since the lift mechanism 31 is arranged on the rear traveling machine body 1 via the axle frame 39, the ventilation cross-sectional area (vertical width dimension and horizontal width dimension) of the discharge duct 29 is formed to a predetermined size to clog the cut grass. The lift mechanism 31 can be supported with high rigidity with a simple assembly structure on the traveling machine body 1.

  On the other hand, the other rotational power of the engine 9 is transmitted from the front end portion of the output shaft 32 to the PTO shaft 42 pivotally supported on the front portion of the body frame 4 via the endless PTO transmission belt 41 for PTO power transmission. . Next, power is transmitted from the PTO shaft 42 to a mower gear box 44 disposed on the right side of the body frame 4 on the upper surface of the mower case 25 through an intermediate shaft 43 having universal joints at both front and rear ends. . As a result, the left rotary cutting blade 26 in the mower case 25 is driven to rotate clockwise in plan view, the right rotary cutting blade 26 is driven to rotate counterclockwise in plan view, and the left and right rotary cutting blades 26 are used to cut turf grass and the like. However, the cut grass such as the cut turf grass is collected in the center of the left and right width of the mower case 25 and discharged from the duct portion 28 to the discharge duct 29.

  In addition, with the above configuration, the power of the engine 9 is transmitted to the transmission case 19 by one propulsion shaft 33, and the ventilation cross-sectional area (vertical width dimension and horizontal width dimension) of the discharge duct 29 is set to a predetermined value. In order to ensure the size, the propulsion shaft 33 can be disposed low by the vertical transmission dimension of the transmission relay case 34 in a state where the transmission case 19 is disposed at a high part of the traveling machine body 1. Even if the propulsion shaft 33 is disposed below the floor (step) of the traveling machine body 1 on which the operator who sits on the driver's seat 15 puts his / her foot, the floor (step) of the traveling machine body 1 can be formed low. . Therefore, the power transmission mechanism to the transmission case 19 can be simply configured, the large discharge duct 29 is arranged at the center of the left and right width of the traveling machine body to facilitate the discharge of the cut grass to the rear, and There is an effect that the operator can easily get on and off the driver seat 15 at the same time.

  Next, the structure of the lift mechanism 31 will be described with reference to FIGS. 3 to 5. As shown in FIGS. 3 and 4, the lift mechanism 31 is supported so as to be able to move up and down with respect to the left and right fixed masts 45, which are parallel to the right and left fixed masts 45, which are arranged substantially vertically on the rear side of the traveling machine body 1. The left and right movable masts 46, the lift frame 47 supported so as to be movable up and down with respect to the left and right movable masts 46, and the single hydraulic lift cylinder that moves up and down the movable mast 46 and the lift frame 47 48.

  As shown in FIGS. 3 to 5, the left and right fixed masts 45 are fastened by bolts 49 to the rear end sides of the left and right axle frames 39. The mounting width of the left and right fixed masts 45 is larger than the left and right width of the discharge duct 29 and smaller than the interval between the left and right rear wheels 6. That is, the left and right fixed masts 45 are disposed between the left and right outer surfaces of the discharge duct 29 and the left and right rear wheels 6 in a rear view (see FIG. 4).

  Both end sides of a pipe-like pedestal frame 50 that is long on the left and right are integrally connected to an intermediate portion of the vertical height of the left and right fixed masts 45 by welding. The lower end side of the lift cylinder 48 is connected to the middle portion of the left and right widths of the base frame 50 via the receiving bolt 51. The table frame 50 is disposed at a position higher than the upper surface of the discharge duct 29, and the auxiliary duct 52 is fixed to the lower surface side of the table frame 50. During the mowing operation, the gap formed between the discharge duct 29 and the grass collection box 30 is closed by the auxiliary duct 52 to prevent the grass from leaking from between the discharge duct 29 and the grass collection box 30 to the outside. It will be possible. Note that a cutout (not shown) through which the auxiliary duct 52 can pass in the vertical direction is formed on the bottom surface of the grass collection box 30. The grass collection box 30 rises or descends without the bottom surface of the grass collection box 30 coming into contact with the auxiliary duct 52.

  As shown in FIG. 5, both end sides of a support frame 53 that is long to the left and right and a bearing plate body 54 are integrally connected to upper ends of the left and right fixed masts 45 by welding. An intermediate portion of the lift cylinder 48 is fixed to the support frame 53 via a U-shaped bolt 53a. A lift cylinder 48 is erected at a middle portion between the left and right fixed masts 45 so as to be substantially parallel to the fixed mast 45. The piston rod 55 protrudes upward from the upper end of the lift cylinder 48.

  As shown in FIGS. 3 to 5, the left and right movable masts 46 are slidable in the vertical direction outside the left and right fixed masts 45 via a plurality of guide wheels 56. The left and right movable masts 46 are connected via a crosspiece frame 57 and slide integrally in the vertical direction. Left and right lift wires 58 and 59 are connected between the support frame 53 and the left and right movable masts 46 as described later.

  Both ends of the left lift wire 58 are connected to the lower end of the left movable mast 46 in the forward direction of the traveling machine body 1 via the wire fixture 60. An intermediate portion of the left lift wire 58 is wound around a folding pulley 63 provided on the support frame 53 via a tension adjusting bolt 61 and a bearing body 62. Two pulleys 64a and 64b provided on the upper end portion of the left fixed mast 45 via the bearing plate 54 and pulleys on both sides of the triple pulley 66 provided on the upper end portion of the piston rod 55 via the support shaft 65. A left lift wire 58 indicated by a two-dot chain line in FIG. 5 is stretched doubly between the wire fixture 60 and the folding pulley 63 via 66a and 66b.

  On the other hand, one end portion of the right lift wire 59 is connected to the lower end portion of the right movable mast 46 in the forward direction of the traveling machine body 1 via a wire fixture 67. The other end of the right lift wire 59 is connected to a tension adjustment bolt 68 provided on the support frame 53. Via a pulley 69 provided on the upper end of the right fixed mast 45 via a bearing plate 54 and a central pulley 66c of a triple pulley 66 provided on the upper end of the piston rod 55 via a support shaft 65. Then, a right lift wire 59 indicated by a one-dot chain line in FIG. 5 is stretched between the wire fixture 67 and the tension adjustment bolt 68 in a single manner.

  That is, with the above configuration, when the piston rod 55 is advanced upward and the triple pulley 66 is lifted, the left and right movable masts 46 are lifted with a double lift stroke with respect to the piston rod 55 advance stroke. It will be. Further, when the left lift wire 58 and the right lift wire 59 are composed of wires having the same diameter, the right movable mast 46 (single lift wire 59) is supported in the forward direction of the traveling machine body 1. Due to the force, the support force of the left movable mast 46 (double lift wire 58) in the forward direction of the traveling machine body 1 increases.

  As shown in FIGS. 3 to 5, a lift frame body 47 is arranged outside the left and right movable masts 46 via a plurality of guide wheels 70 so as to be slidable in the vertical direction. The lift frame 47 includes left and right fork bodies 71 extending substantially horizontally in the front-rear direction, and a dump fulcrum shaft 72 that rotatably supports the grass collection box 30 described above. The front end side of the left and right fork bodies 71 is supported by the left and right movable masts 46, the dump fulcrum shaft 72 is disposed on the rear end side of the left and right fork bodies 71, and the dump fulcrum shaft 72 is directed toward the rear of the traveling machine body 1. The grass collection box 30 is rotated.

  Further, both ends of the left and right pull-up wires 74 are connected to a tension adjusting bolt 73 provided on the left and right outer sides of the lift frame 47 and the left and right bearing plate bodies 54. The left and right pulling wires 74 shown by broken lines in FIG. 5 are stretched through pulling pulleys 75 provided at the upper ends of the left and right movable masts 46, respectively. The lift frame 47 is lifted by a lift stroke twice as high as the lift stroke of the movable mast 46.

  That is, the lift frame body 47 is raised with an ascending stroke four times the advance stroke of the piston rod 55. Therefore, by using an inexpensive lift cylinder 48 with a short advancing / retreating stroke of the piston rod 55, the lifting / lowering stroke of the grass collecting box 30 can be made large, and the collecting posture position from the rear of the traveling machine body 1 to the high discharging posture position is collected. The grass box 30 can be raised by the maximum lift height H (see FIG. 4).

  Next, the structure of the grass collection box 30 is demonstrated, referring FIG.3 and FIG.6. As shown in FIGS. 3 and 6, the grass collection box 30 includes a grass collection body 76 that communicates with the discharge duct 29 and a lid 77 that closes the opening on the rear surface side of the grass collection body 76 so as to be openable and closable. Have. A quadrilateral box-shaped grass collection box 30 is formed by combining a side-view trapezoidal grass collection body 76 with a side-view triangular-shaped lid 77.

  A rear end portion of the bottom surface of the grass collection body 76 (a lower end portion on the rear surface opening side of the grass collection body 76) is connected to the dump fulcrum shaft 72. A hydraulic dump cylinder 78 is arranged outside the left fork body 71 in the forward direction of the traveling machine body 1. The dump cylinder 78 is coupled to the left fork body 71 via a cylinder coupling shaft 78a. A tip end portion of a piston rod 80 of a dump cylinder 78 is connected by a shaft 81 to a dump arm 79 provided at a left end portion of the dump fulcrum shaft 72. By advancing the piston rod 80, the grass collection body 76 is rotated rearward around the dump fulcrum shaft 72 so that the flat bottom surface of the grass collection body 76 has a front height so that the front side is high and the rear side is low. The rear side of the grass collection body 76 is inclined downward and opened rearward and obliquely downward (see FIG. 6).

  An opening / closing fulcrum shaft 83 is disposed at the rear end portion of the upper surface frame 82 of the grass collection body 76 (the upper end portion on the rear surface opening side of the grass collection body 76). The front end of the upper surface of the lid 77 is connected to the opening / closing fulcrum shaft 83. The lid 77 rotates around the opening / closing fulcrum shaft 83 and moves to the open position or the closed position. One end side of a pair of left and right opening / closing operation arms 84 is connected to the left and right ends of the opening / closing fulcrum shaft 83 projecting to the left and right sides of the grass collecting body 76. Both end sides of the opening / closing operation link 87 are connected to the fork body 71 in front of the dump fulcrum shaft 72 and the other end side of the opening / closing operation arm 84 extended forward from the opening / closing fulcrum shaft 83 via shafts 85 and 86, respectively. To do. The opening / closing link mechanism 88 formed by the pair of left / right opening / closing operation arms 84 and the pair of left / right opening / closing operation links 87 is interlocked with the rotation of the grass collection main body 76 around the dump fulcrum shaft 72 (see FIG. 6).

  That is, when the grass collecting body 76 is rotated rearward about the dump fulcrum shaft 72 and moved to the cut grass discharging position, the opening / closing fulcrum shaft 83 is rotated rearward about the dump fulcrum shaft 72 and the opening / closing fulcrum shaft 83 is moved. The arm 85 moves in a direction away from the shaft 85, and the opening / closing operation arm 84 is pulled by the opening / closing operation link 87 having a predetermined length. Therefore, the lid 77 is rotated rearward around the opening / closing fulcrum shaft 83 by the opening / closing link mechanism 88, and the lid 77 is moved to the open position (solid line position in FIG. 6). Then, the grass collection body 76 and the lid body 77 are connected to each other via the opening / closing fulcrum shaft 83 in a state of being bent in a U-shape, whereby the rear surface opening of the grass collection body 76 is opened rearward and obliquely downward. In addition, since the front opening of the lid body 77 is opened forward and obliquely downward, the grass collection body 76 and the mowing grass 89 inside the lid body 77 fall to the approximate center of the upper surface opening of the container 90 below. (See FIG. 6).

  On the other hand, when the dump cylinder 78 is operated and the piston rod 80 is retracted, the grass collection body 76 rotates forward around the dump fulcrum shaft 72 and returns to the cut grass collection position. In conjunction with the rotation around the dump fulcrum shaft 72, the lid 77 is rotated forward around the opening / closing fulcrum shaft 83 by the opening / closing link mechanism 88, and the lid 77 returns to the closed position (solid line position in FIG. 3). It will be.

  Next, the mounting structure of the lift lever 110 and the dump lever 111 will be described with reference to FIGS. As shown in FIGS. 7 and 8, a hydraulic piping block 114 that connects a hydraulic pump (not shown) driven by the engine 9 to a lift cylinder 48 and a dump cylinder 78 via hydraulic piping (not shown). Prepare. In addition, a hydraulic valve unit body 115 incorporating the lift valve 107 and the dump valve 109 and a hydraulic unit case 116 in which the hydraulic piping block 114 and the hydraulic valve unit body 115 are provided are provided.

  The lower surface side of the hydraulic valve unit body 115 is integrally fixed to the upper surface side of the hydraulic piping block 114. The hydraulic unit case 116 is installed on the upper surface side of the rear portion of the rear cowl 14 via the right body frame 4 (see FIG. 1). A hydraulic unit case 116 is disposed obliquely rearward on the right side of the driver seat 15 (see FIG. 2).

  As shown in FIGS. 7 to 10, the lift lever 110 and the dump lever 111 are disposed on the front surface of the hydraulic valve unit body 115 via the lever bearing portion 117 so as to be movable in the vertical direction. The lift lever 110 (dump lever 111) protrudes substantially horizontally toward the front of the hydraulic valve unit body 115 when the lift valve 107 (dump valve 109) is in a neutral state. The operator holds the lift lever 110 (dump lever 111), pivots the lift lever 110 (dump lever 111) upward or downward with the lever bearing portion 117 as a fulcrum, and lifts the lift valve 107 (dump valve 109) upward. Alternatively, switching to the lowering side (opening side or closing side) is performed, and the lift cylinder 48 (dump cylinder 78) is operated to the rising side or lowering side (opening side or closing side).

  7 and 8, a lever guide body 118 that pivotally guides the lift lever 110 and the dump lever 111 upward or downward, and a lock arm body that is coupled to the brake pedal 13 via a brake detection wire 119. 120 and a check arm body 121 that restricts the switching operation of one of the lift lever 110 and the dump lever 111 by the switching operation of the other. A lock arm body 120 and a check arm body 121 are pivotally supported by a lever guide body 118 provided in the hydraulic unit case 116 via a support shaft 122 so as to be rotatable.

  As shown in FIG. 8, the lock arm body 120 is formed with a cut grass discharge regulating notch 120 a that locks the intermediate portion of the lift lever 110. The check arm body 121 is formed with a lift check notch 121a for locking the intermediate portion of the lift lever 110 and a dump check notch 121b for locking the intermediate portion of the dump lever 111. In addition, a pair of pressure rolls 123 and 124 that are brought into contact with the intermediate portion of the lift lever 110 are pivotally supported on the check arm body 121 via roll shafts 125 and 126. The pair of pressure rolls 123 and 124 are arranged so as to sandwich the lift check notch 121a.

  As shown in FIG. 8, a brake detection spring 127 having a pinch spring shape in which one end side 127 a is locked to the lock arm body 120 and the other end side 127 b is locked to a connecting pin 129 described later, 110, a brake detection spring 127 that rotates the lock arm body 120 in a direction in which the cut grass discharge regulation notch 120a is separated from the cutting lever 110, and a tension for rotating the check arm body 121 in a direction in which the dumping restraint notch 121b is separated from the dump lever 111. And a spring-like release spring 128.

  As shown in FIGS. 7 and 8, a connection fitting 130 at one end of the brake detection wire 119 is connected to one end of the lock arm body 120 with the intermediate portion fitted on the support shaft 122 via a connection pin 129. It is locked. A stopper body 131 for supporting the lock arm body 120 is integrally formed on the other end side of the lock arm body 120 at a position where the cut grass discharge regulation notch 120 a is separated from the lift lever 110.

  The connecting pin 129 is engaged with the other end side 127b of the brake detection spring 127 in which the one end side 127a is engaged with the lock arm body 120. Both end sides of the release spring 128 are locked to the roll shaft 125 and the connecting pin 129, respectively. Note that the spring force of the brake detection spring 127 is made smaller than the spring force of the pedal return spring (not shown) that maintains the brake pedal 13 at the initial position (brake release position). Further, the spring force of the release spring 128 is made smaller than the spring force of the brake detection spring 127.

  With the above configuration, as shown in FIG. 8, when the brake pedal 13 is maintained at the initial position (brake release position) by a pedal return spring (not shown), the pedal return for maintaining the brake pedal 13 at the initial position is performed. Since the brake detection wire 119 is pulled by the spring force of the spring, the posture of the lock arm body 120 is brought into a state in which the cut grass discharge restriction notch 120a is locked to the lift lever 110 against the spring force of the brake detection spring 127. Is retained. On the other hand, the posture of the restraining arm body 121 is such that the side edge 120b of the lock arm body 120 and the pressure roll 124 come into contact with each other by the spring force of the release spring 128 and the dump restraining notch 121b is locked to the dump lever 111. Is retained.

  Therefore, when the brake pedal 13 is not stepped on by the operator, any operation of the lift lever 110 and the dump lever 111 is prohibited by the lock arm body 120 and the check arm body 121. When mowing turf grass or the like, the operator removes the right foot from the brake pedal 13 and depresses the speed change pedal 12 with the right foot, so that the traveling body 1 moves, and mowing work such as turf grass is performed and cut. Mowed grass such as turf grass is collected in the grass collection box 30.

  On the other hand, as shown in FIG. 9, when the brake pedal 13 is stepped on by the operator and the rear wheel 6 is braked, the brake detection wire 119 is loosened. The posture of the lock arm body 120 is maintained in a state in which the cut grass discharge restriction notch 120a is separated from 110. In that case, the stopper body 131 contacts the upper surface of the lever guide body 118. Further, the posture of the restraining arm body 121 is maintained in a state where the lift lever 110 and the pressure roll 124 come into contact with each other by the spring force of the release spring 128 and the dump restraining notch 121b is separated from the dump lever 111.

  That is, in the state of FIG. 9 in which the dump check notch 121b is separated from the dump lever 111, the lift lever 110 or the dump lever 111 can be operated by the operator. At that time, the restraining arm body 121 is separated from the dump lever 111 by the spring force of the release spring 128. Therefore, when the dump lever 111 is operated by the operator to operate the dump cylinder 78, the dump lever 111 moves to a contact position with the regulating end 121c or 121d of the restraining arm body 121, and the pressure rolls 123, 124 are moved. The posture of the check arm body 121 is maintained in a state where the lift lever 110 is locked to the lift check notch 121a. Therefore, even if the lift lever 110 is to be operated, the restriction end 121c or 121d of the restraining arm body 121 comes into contact with the dump lever 111 and the movement of the restraining arm body 121 is prevented by the dump lever 111. The lift lever 110 is supported between the rolls 123 and 124, and the lift lever 110 cannot be operated. In other words, in the state of FIG. 9 where the dump lever 111 is operated (the dump cylinder 78 is operating), the operation of the lift lever 110 is prohibited by the check arm body 121.

  On the other hand, as shown in FIG. 10, when the operator operates the lift lever 110 in the upward (downward) direction and the lift cylinder 48 is activated, the pressure roll is lifted by the lift lever 110 against the release spring 128. Since 123 (pressure roll 124) is pushed, the restraining arm body 121 is supported in a state where the dump restraining notch 121b is locked to the dump lever 111. In other words, in the state of FIG. 10 where the lift lever 110 is operated (the lift cylinder 48 is operating), the operation of the dump lever 111 is prohibited by the check arm body 121. Therefore, the operator can alternatively operate either the lift lever 110 or the dump lever 111 by separating the cut grass discharge regulation notch 120a from the lift lever 110.

  Next, an attachment structure of the support leg 132 as an outrigger that prevents the traveling machine body 1 from falling over will be described with reference to FIGS. 11 to 13. As shown in FIGS. 11 to 13, an outrigger support frame 133 is fixed to the lower end portion of the fixed mast 45 by welding. An intermediate portion of the leg base 135 of the support leg 132 is pivotally supported on the outrigger support frame 133 via the outrigger support shaft 134. A leg end portion 136 of the support leg 132 is connected to one end side of the leg base portion 135. The access operation portion 135a on the other end side of the leg base portion 135 is extended below the mast bottom surface 46a of the movable mast 46. When the movable mast 46 is lowered, the mast bottom surface 46a comes into contact with the access control portion 135a from the upper side.

  That is, during the mowing work in which the movable mast 46 is supported at the lowest position, the mast bottom surface 46a abuts on the entrance / exit operation portion 135a from the upper side, and the leg end portion 136 is lifted to the storage position away from the traveling road surface. Become. On the other hand, when the movable mast 46 is lifted and the grass collecting box 30 is lifted to a high place, the mast bottom surface 46a is separated from the entrance / exit operation unit 135a, and the support leg 132 is outriggered by the gravity of the leg tip 136 side. By rotating around the support shaft 134, the leg end portion 136 is landed on the traveling road surface.

  In the above-described embodiment, the leg tip 136 is landed on the traveling road surface by its own weight by raising the movable mast 46. However, the support leg 132 is placed in the direction in which the leg tip 136 lands. A spring for rotating around may be provided, and the leg end portion 136 may be pressed by the spring on the road surface.

  As shown in FIGS. 11 to 13, an outrigger lock mechanism 137 that supports the support leg 132 in the landing posture is provided. The outrigger lock mechanism 137 includes a ratchet gear 138 fitted on the outrigger support shaft 134 and a ratchet arm 140 integrally formed on one end with a ratchet claw 139 that is detachably engaged with the ratchet gear 138. The support leg 132 and the ratchet gear 138 are integrally connected. The support leg 132 and the ratchet gear 138 rotate integrally around the outrigger support shaft 134.

  A lock fulcrum shaft 141 is disposed on the fixed mast 45, and an intermediate portion of the ratchet arm 140 is rotatably fitted on the lock fulcrum shaft 141. A ratchet claw 139 is integrally formed on one end side of the ratchet arm 140. A slidable contact roller 143 is pivotally supported on the other end side of the ratchet arm 140 via a roller shaft 142. A ratchet spring 144 for locking and maintaining the ratchet pawl 139 on the ratchet gear 138 is connected between the fixed mast 45 and the ratchet arm 140.

  With the above configuration, the grass collecting box 30 is supported at the grass collecting posture position at the rear of the traveling machine body 1 and the movable mast 46 is supported at the lowest lowered position (the movable mast 46 is supported at the lowest lowered position). During the mowing operation), the mast bottom surface 46a abuts on the access operation portion 135a of the support leg 132, and the leg end portion 136 of the support leg 132 is lifted to the storage position indicated by the solid line in FIG. In that case, the ratchet arm 140 also contacts the mast bottom surface 46 a via the sliding contact roller 143, and the ratchet pawl 139 is supported at a position separated from the ratchet gear 138 against the ratchet spring 144. Therefore, the support leg 132 is held at the storage position below the grass collection box 30.

  As shown in FIG. 12, when the movable mast 46 rises from the lowest lowered position in FIG. 11, first, the mast bottom surface 46a is separated from the entrance / exit operation unit 135a, and the leg tip is at the landing position shown by the solid line in FIG. The part 136 descends by its own gravity, and the leg end part 136 lands on the landing surface G (traveling road surface). Next, as the movable mast 46 further rises from the landing position of the support leg 132 in FIG. 12, the mast bottom surface 46a is separated from the sliding contact roller 143 as shown in FIG. 13, and the ratchet arm 140 is in FIG. Since the ratchet spring 144 is rotated to the position indicated by the solid line, the ratchet pawl 139 is locked and maintained on the ratchet gear 138 by the ratchet spring 144. The support leg 132 is supported in a state where it has landed on the landing surface G (traveling road surface).

  That is, when the grass collection box 30 is lifted to a high place (the discharge position of the mowing grass 89 shown in FIG. 6), the support leg 132 is landed on the landing surface G due to the locking of the ratchet gear 138 and the ratchet pawl 139. Held in. Therefore, when the traveling machine body 1 is tilted in the left-right direction, the traveling machine body 1 is supported by the support legs 132 on the inclined side, so that the traveling machine body 1 can be prevented from being tilted to the falling angle, and the traveling machine body 1 can be prevented from falling. .

  On the other hand, when the grass 89 in the grass collection box 30 is discharged and the grass collection box 30 is lowered to the grass collection posture position (mowing and grass collection work position shown in FIG. 3), the ratchet pawl 139 is placed on the ratchet gear 138. When the movable mast 46 is lowered in the locked state shown in FIG. 13, first, as shown in FIG. 12, the mast bottom face 46a comes into contact with the sliding contact roller 143, and the ratchet arm 140 is shown by the solid line in FIG. The ratchet pawl 139 is disengaged from the ratchet gear 138 since the ratchet spring 144 rotates against the position indicated by.

  Next, when the movable mast 46 further descends from the disengagement position of the ratchet pawl 139 in FIG. 12 (the landing position of the support leg 132), the mast bottom 46a is moved in and out of the support leg 132 as shown in FIG. The support leg 132 rotates around the outrigger support shaft 134 by the lowering of the movable mast 46 in contact with the portion 135a, and the leg tip portion 136 of the support leg 132 is lifted to the storage position indicated by the solid line in FIG. Therefore, even if the traveling machine body 1 is moved and the mowing operation is performed, the support leg 132 is positioned substantially horizontally rearward in the storage position higher than the lower end of the fixed mast 45 near the bottom of the grass collection box 30. Thus, the support leg 132 can be prevented from colliding with the traveling road surface or an obstacle to be damaged.

  As is clear from the above description and FIGS. 3 and 11 to 13, a mower device 16 mounted on the traveling machine body 1, and a grass collection box 30 as a grass collection body for collecting grass cut by the mower device 16, The traveling machine body 1 includes a lift mechanism 31 that supports the grass collection box 30 so that the grass collection box 30 can be moved up and down. The lift mechanism 31 lifts the grass collection box 30 and discharges the cut grass 89 in the grass collection box 30. The lawn mower is provided with a support leg 132 that prevents the traveling machine body 1 from overturning, the support leg 132 is connected to the lift mechanism 31, and the support leg 132 moves closer to the landing direction by the lifting operation of the grass collection box 30 ( On the other hand, the support leg 132 is configured to move away (retreat) from the ground surface in the upward ground direction by the lowering operation of the grass collection box 30.

  That is, the lifting movement of the piston rod 55 of the lift cylinder 48 and the movement of the support leg 132 to the landing surface so that the support leg 132 moves (advances) in the landing direction by the raising operation of the grass collection box 30. The retraction operation of the piston rod 55 of the lift cylinder 48 and the landing of the support leg 132 so that the support leg 132 moves away (retreats) in the ground direction by the lowering operation of the grass collection box 30. Since the movable mast 46 is provided as an interlocking mechanism that relates to the separation movement from G, the container 90 is supported while the traveling machine body 1 is supported on the ground via the support legs 132 and the traveling machine body 1 is maintained in a stable posture. Alternatively, the grass collection body 30 can be easily lifted to the height of a truck bed or the like, and the traveling machine body 1 can be prevented from falling. Further, in connection with the operation of lifting the grass collection box 30, the support leg 132 automatically moves in the landing direction, so that the support leg 132 moves away (retreats) from the landing surface. It is possible to prevent the discharge work of the turf grass 89 and the like in the grass box 30 from being executed. Further, in association with the operation of returning the grass collection box 30 to the grass collection work position of the traveling machine body 1, the support leg 132 automatically moves away (retreats) from the landing surface G. It is possible to prevent the cutting operation of the turf grass 89 and the like from being resumed in a state of approaching (advancing) in the landing direction. That is, it is possible to save the operator's operation for moving the support leg 132 in the direction of landing (advancing) or moving away from the landing surface G (retreating), and discharging the grass 89 in the grass collection box 30. Can be improved.

  As apparent from the above description and FIGS. 12 and 13, the lock mechanism 137 is provided to hold the support leg 132 in the landing posture, and the lock mechanism 137 is locked to the support leg 132 by the raising operation of the grass collection box 30. Thus, when the grass collection box 30 is lifted to the discharge height of the turf grass 89 or the like, the support leg 132 can be automatically locked in the landing posture by the lock mechanism 137. It is possible to save the operator's operation for locking the support leg 132 to the landing posture, to eliminate the operator from forgetting to lock the support leg 132, and to improve the lifting workability of the grass collection box 30.

  As is clear from the above description and FIGS. 12 and 13, after the support leg 132 has moved closer (moved forward) in the landing direction by the raising operation of the grass collection box 30, the grass collection box 30 is further raised. Since the lock mechanism 137 is configured to be engaged with the support leg 132, the lock mechanism 137 is moved until the support leg 132 shifts from the retracted position separated from the landing surface G to the landing position. 137 can prevent the support leg 132 from being locked. The support leg 132 can always be locked in the landing posture by the lock mechanism 137 and the grass collection box 30 can be lifted.

  As apparent from the above description and FIGS. 11 to 13, after the lock mechanism 137 is detached from the support leg 132 by the lowering operation of the grass collection box 30, the grass collection box 30 is further lowered to support the lock mechanism 137. Since the leg 132 is configured to move away (retreat) from the landing surface G, the lowering operation of the grass collection box 30 is performed until the support leg 132 is unlocked in the landing posture. Thus, it is possible to prevent the support leg 132 and the like from being damaged due to the support leg 132 being operated to move away (retract). The operator can forget to unlock the support leg 132 and return the support leg 132 to the retracted position away from the landing surface G, and the cutting work of the turf grass 89 and the like can be resumed.

  As is clear from the above description and FIGS. 8 to 10, the mower device 16 mounted on the traveling machine body 1, the grass collection box 30 that collects the grass cut by the mower apparatus 16, and the traveling machine body 1 collects grass. A lift mechanism 31 that supports the box 30 to be movable up and down, a lift cylinder 48 as a lift means that supports the grass collection box 30 to be lifted up and down on the lift mechanism 31, and a lift mechanism 31 that supports the grass collection box 30 to be able to roll. A dump cylinder 78 as a dumping means, a brake pedal 13 as a brake operating body for braking the rear wheel 6 as a traveling part of the traveling machine body 1, and a lift lever 110 as a lifting operation body for operating the lift cylinder 48 A lawn mower comprising a dump lever 111 as a rolling operation body for operating the dump cylinder 78, and a brake pedal 3 is provided with a lock arm body 120 as permission control means for allowing the operation of the lift lever 110 and the operation of the dump lever 111 by detecting the braking operation 3, so that the operator forcibly brakes the rear wheel 6. In this state, the lift cylinder 48 or the dump cylinder 78 can be operated, the erroneous operation of the lift lever 110 or the dump lever 111 can be reduced, and the cut grass 89 in the grass collection box 30 can be easily prevented from being discharged to an unexpected place. it can.

It is the whole lawn mower side view. It is the same top view. It is a side view which shows the rear part and traveling body of a traveling body. It is a rear view which shows a lift mechanism. It is the elements on larger scale of the lift mechanism of FIG. It is a side view which shows discharge of the cut grass of a grass collection body. It is a side view of the attachment part of a lift lever and a dump lever. It is a front view of the attachment part of a lift lever and a dump lever. It is operation | movement explanatory drawing of a dump lever. It is operation | movement explanatory drawing of a lift lever. It is a side view of the attaching part of a support leg. It is a side view which shows the state which the support leg body landed. It is a side view which shows the state which locked the support leg body to the landing position.

Explanation of symbols

1 traveling body 6 rear wheel (traveling part)
13 Brake pedal (brake operating body)
16 More equipment 30 Grass collection box (grass body)
31 Lift mechanism 48 Lift cylinder (lift means)
78 Dump cylinder (Dump means)
89 Mowing 110 Lift lever (lifting body)
111 Dump lever (rolling operation body)
120 Lock arm (permission control means)
132 Support leg 137 Outrigger lock mechanism

Claims (5)

A mower device mounted on the traveling machine body, a grass collecting body for collecting grass cut by the mower apparatus, and a lift mechanism for supporting the grass collecting body so as to be movable up and down on the traveling machine body. In a lawn mower configured to lift the grass body and discharge the cut grass in the grass collection body,
A support leg for preventing the traveling machine body from overturning, and connecting the support leg to the lift mechanism;
The support leg is configured to move closer to the landing direction by the raising operation of the grass body, while the support leg is moved away from the ground by the lowering operation of the grass body. Lawn mower.   The lock mechanism for holding the support leg in a landing posture is provided, and the lock mechanism is configured to be locked to the support leg by an ascending operation of the grass collection body. Lawn mower.   After the support leg is moved closer to the landing direction by the raising operation of the grass collection body, the lock mechanism is configured to be engaged with the support leg by further raising the grass collection body. The lawn mower according to claim 2.   After the lock mechanism is released from the support leg by the lowering operation of the grass body, the support leg is further separated from the landing surface by further lowering the grass body. The lawn mower according to claim 2 or 3. Lift means for supporting the grass collection body so as to be able to move up and down on the lift mechanism; dump means for supporting the grass collection body on the lift mechanism so as to be capable of rolling; and a brake operating body for braking the traveling portion of the traveling machine body; A lawnmower comprising a lifting operation body for operating the lift means and a rolling operation body for operating the dump means,
The lawn mower according to claim 1, further comprising permission control means for detecting a braking operation of the brake operation body and permitting the operation of the lifting operation body and the operation of the rolling operation body.

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