JP2008271896A - Lawn mower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lawn mower which includes a lawn-mowing mechanism, a lawn-collecting box for receiving mowed lawn, and a lifting mechanism for lifting the lawn-collecting box, further includes a rear lid plate formed to openably close the opening of the rear side of the lawn-collecting box, highly stably supports the lawn-collecting box, when the lawn-collecting box is lifted at a high place, is small, and is light-weight. <P>SOLUTION: This lawn mower is characterized by opening the bottom portion of the lawn-collecting box, disposing a bottom lid plate 20 for openably closing the opened bottom portion, and connecting the bottom lid plate 20 to operate to open interlocked with the opening movement of a rear lid plate 21. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lawn mower provided with a grass collecting and discharging mechanism configured to collect an appropriate amount of cut grass and lift it to a high position and then discharge the grass among lawn mowers configured to cut grass while traveling. Is.

Conventionally, in this type of lawn mower, for example, as described in Patent Documents 1 and 2, a grass mower released backward from the rear of the lawn mower is opened and closed at an opening on the rear surface. In a grass collection box with a free rear cover plate, the grass collection box is received at a lowered position, and when a predetermined amount of mowing grass enters the grass collection box, the grass collection box is raised to a high position. After that, by opening the rear cover plate and turning it backward so that the opening on the rear side faces downward, the grass cut in the interior is discharged from a high position.
JP 2001-275438 A JP 2002-84950 A

  However, in this way, the discharge of the mowing grass received in the grass collection box can be swung back to the rear so that the opening on the rear surface faces downward with the grass collection box being lifted high. Therefore, when the discharge is performed, the height of the center of gravity of the grass collection box from the ground is increased. Therefore, the grass collection box is raised so that the grass collection box easily swings in the lateral direction. There was a problem that the support in the lifted state became unstable.

  In addition, the grass collection box must be pivoted rearward so that the opening on the rear surface faces downward with the mowing grass put in it, and a mechanism for pivoting this rearward ( For example, a hydraulic cylinder, etc.) must be constructed to have a large output and therefore a large size, and the weight of the grass collection box will increase significantly. There is a problem that not only instability increases, but also the lift mechanism increases in size and weight, and as a result, increases the overall size and weight of the lawn mower.

  In order to solve these problems, the present invention lowers the height of the center of gravity from the ground at the time of discharge, and stabilizes the support in a state where the grass collection box is lifted high, and achieves a reduction in size and weight. This is a technical issue.

In order to achieve this technical problem, claim 1
“A lawn mowing mechanism, a grass collecting box that accepts the grass cut by the lawn mowing mechanism in a forward posture, and a lift mechanism that lifts the grass collecting box in a forward posture. In a lawn mower equipped with a rear cover plate so as to freely open and close the rear opening of the box,
A bottom cover plate is provided for opening the bottom of the grass collecting box and closing the open bottom so that the open bottom can be freely opened and closed. The bottom cover plate is attached to the rear cover plate or its opening / closing mechanism to open the rear cover plate. It was connected so as to open and rotate in conjunction with. "
It is characterized by that.

Claim 2
“In the description of claim 1, the opening operation in the bottom cover plate is configured to rotate and open so that at least the front end portion of the bottom cover plate springs up into the grass collection box.”
It is characterized by that.

Claim 3
“In the description of claim 1, the opening operation in the bottom cover plate is configured to rotate and open so that the front end portion of the bottom cover plate rises toward the grass collection box and the rear end portion decreases. . "
It is characterized by that.

  In the configuration described in claim 1, when a predetermined amount of cut grass is received in the grass collection box as the mowing operation proceeds, the lift mechanism lifts the grass collection box to a high position.

  In this lifted state, when the rear cover plate on the rear surface of the grass collection box is opened and operated, the bottom cover plate on the bottom surface of the grass collection box is also opened and operated. Mowed grass is discharged from a high position above the ground.

  In other words, the cut grass is discharged from the grass collection box by opening the bottom cover plate in conjunction with the opening operation of the rear cover plate on the rear surface of the grass collection box. , The height of the center of gravity from the ground when it is lifted up is significantly lower than in the conventional case by not needing to rotate the whole of the collection box in a state where it is lifted high. In addition, it is only necessary to open and close the rear cover plate, and the opening and closing operation can be performed by a mechanism (eg, a hydraulic cylinder) having a relatively small output compared to the conventional case, and thus a small mechanism. Since the weight of the grass collection box can be reduced, the stability of the support when the grass collection box is lifted up can be further improved, and the size and weight of the lift mechanism can be reduced. Te can be achieved with certainty the size and weight of the entire lawn mower.

  And, as described in claim 2, the opening operation in the bottom lid plate is configured to open and rotate so that at least the front end portion of the bottom lid plate springs up into the grass collection box. , All of the mowing grass in the grass collection box can be reliably discharged, and the discharging position of the mowing grass can be set away from the lawn mower.

  Further, as described in claim 3, the opening operation in the bottom cover plate is configured to rotate so that the front end portion of the bottom cover plate rises toward the grass collection box and the rear end portion thereof is lowered. In this way, the discharge of the cut grass from the grass collection box is not only performed on the rear surface of the grass collection box, but also on the bottom cover plate among the open bottoms of the grass collection box. Since it is also performed from the portion corresponding to the end portion, there is an advantage that the cut grass can be discharged reliably and quickly.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  In these drawings, reference numeral 1 denotes a riding lawn mower. The lawn mower 1 has a traveling machine body 2 composed of a pair of left and right side frames 3 extending in the front-rear direction. The vehicle body 2 is supported by a pair of left and right front wheels 5 that are in contact with the ground 4 and a pair of left and right rear wheels 6 that are also in contact with the ground 4. A handle 8 and a control seat 9 are provided, a bonnet cover 10 that detachably covers the engine 7, a step base 11 for the control seat 9, and a fender 12 that covers both the rear wheels 6 are provided. The lawn mower 1 is configured to travel forward or backward by rotating both rear wheels 6 with the engine 7.

  On the lower surface of the traveling machine body 2, a rotary lawn mowing mechanism 13 is configured such that the turfgrass on the ground 4 is cut by driving by the power transmission from the engine 6 at a portion between the front wheels 5 and the rear wheels 6. Is provided so as to be able to move up and down, and a discharge duct 14 that discharges the grass cut by the rotary lawn mowing mechanism 13 toward the rear of the traveling machine body 2 is provided between the two rear wheels 5. It is provided so as to extend rearward.

  As shown in FIGS. 1 and 2, a rope hook 15 formed by bending a metal rod into a semicircular loop or the like is provided on the outer surface of the center portion of the rear wheels 6. When the lawn mower 1 is transported on a trailer or the like, it is detachably attached by simultaneous fastening by a plurality of bolts 15a for detachably attaching the hub at the center of the axle to the axle. A rope or chain for fixing the rear portion of the lawn mower 1 to a trailer or the like can be hung on the rope hook 15. The rope hook 15 has a loop shape. However, when it is configured as a semicircular loop as shown in the figure, not only can grass be wrapped around it, but also its rigidity is improved. There are advantages such as being able toThe rope hook 15 having such a configuration can be provided on both front wheels 5 instead of the both rear wheels 6 or on both front wheels 5 and both rear wheels 6.

  At the rear of the lawn mower 1, a grass collection mechanism 16 is mounted so as to collect, lift and discharge the grass that is discharged rearward from the discharge duct 14, as will be described in detail later. A weight 17 is attached to the front portion of the lawn mower 1 to balance the weight of the front and rear with respect to the grass collecting and discharging mechanism 16.

  The grass collection discharge mechanism 16 discharges the grass collection box 18 having an opening 18a facing the rear end of the discharge duct 14 on the front surface and the grass collection box 18 from the discharge duct 14 at a lowered position. A lift mechanism 19 configured to reciprocate back and forth between a forward attitude for receiving the cut grass and a high lifted position in the forward attitude.

  The grass collection box 18 in the grass collection / discharge mechanism 16 has both the left and right side surfaces and the upper surface surrounded by a side plate 18b and a ceiling plate 18c made of a perforated plate (punching plate) or a breathable plate such as a wire mesh. The rear surface of the grass collection box 18 is closed by an openable / closable bottom cover plate 20, and the open rear surface is closed by an openable / closable rear cover plate 21. It is configured.

  The bottom cover plate 20 is pivotally attached to the lower end of a bracket member 22 fixed to the outside of the left and right side plates 18b of the grass collection box 18 by means of a pivot pin 23. , A thin metal plate having air permeability such as a perforated plate (punching plate) or a wire mesh, as shown in FIG. 5, and an inclined portion 20 a inclined obliquely upward at a relatively gentle angle from the front end toward the rear. The vertical portion 20b that bends downward from the rear end of the inclined portion 20a is repeatedly provided a plurality of times so that its rigidity is increased by bending it into a sawtooth cross section having a low height. The position of the contact pin 23 is shifted to the rear end by an appropriate dimension from the center position between the front end and the rear end of the bottom cover plate 20 at the front side of the rear end of the bottom cover plate 20. Position Therefore, the bottom cover plate 20 has a lateral member 39 that connects the lower ends of the left and right side plates 18b of the grass collection box 18 with a weight in front of the pivot pin 23 in a normal state. All the open bottoms of the grass collection box 18 are closed (closed) in contact with the upper surface, but when an external force acts downward on the rear end, the pivot pin 23 is the center. Then, it is configured to open and rotate so that the front end springs up.

  On the other hand, the rear cover plate 21 is also made of a breathable plate such as a perforated plate (punching plate) or a wire mesh, and pins 24a are formed on the outer side surfaces of the left and right side plates 18b of the grass collecting box 18 on the left and right sides thereof. , 25a is pivotally connected to a pair of upper and lower links 24, 25 which are pivotally attached, so that the rear surface opened in the grass collection box 18 is closed and the rear surface is lifted up. The opening and closing operation is configured to open and close, and this opening and closing operation is a reversing type mounted between the bracket member 22 and the lower link 25 of the pair of upper and lower links 24 and 25. The opening / closing hydraulic cylinder 26 is used.

  Between the rear lid plate 21 and the front end of the bottom lid plate 20, a pair of left and right flexible metal wires 27 or chains, etc., arranged inside the grass collection box 18. When the rear cover plate 21 jumps and pivots so as to open the rear surface of the grass collection box 18 by the piston projecting motion in the opening / closing hydraulic cylinder 26 by connecting with the members, the metal wire 27 is interposed therebetween. In conjunction with this, the bottom cover plate 20 is rotated so that the front end of the bottom cover plate 20 is raised while the rear end is lowered to open the bottom surface of the grass collecting box 18, and the rear cover plate 21 is a piston in the hydraulic cylinder 26 for opening and closing. When returning to the state in which the rear surface of the grass collection box 18 is closed by the backward movement, the bottom cover plate 20 returns to the state in which the bottom surface of the grass collection box 18 is closed by the weight of the front side. Configure There.

  In this case, when both ends of the metal wires 27 are pivotally connected to the bottom cover plate 20 and the rear cover plate 21 by pins 27a and 27b, the metal wires 27 are rotated around their longitudinal axes. The bottom cover plate 20 and the rear cover plate 21 are twisted against the elasticity by an appropriate angle (for example, 90 to 180 degrees) and coupled with the pins 27a and 27b in this state. 1 is kept in contact with the upper surface of the bottom cover plate 20, as shown in FIG. 1, the slack portion in the middle of the metal wire 27 can be maintained. When the cut grass is received into the grass box 18, the metal wire 27 can be prevented from becoming an obstacle.

  In this case, as another embodiment, one of the upper and lower links 24 and 25 serving as an opening / closing mechanism for the rear cover plate 21 or the opening / closing hydraulic cylinder 26 is provided on both outer sides of the grass collection box 18. By connecting the bottom cover plate 20, the bottom cover plate 20 can be configured to open and rotate in conjunction with the opening operation of the rear cover plate 21.

  In addition, in the lower side of the opening 18 a in the front surface of the grass collection box 18, the mowing grass discharged backward from the rear end of the discharge duct 14 can be smoothly guided without spilling into the grass collection box 18. A bottom guide plate 28 is provided.

  The lift mechanism 19 in the grass collection / discharge mechanism 16 is configured as shown in FIGS.

  In other words, the lift mechanism 19 includes a mast member 29 disposed on each of the left and right sides sandwiching the grass collection box 18, a return-type lifting hydraulic cylinder 30, and a pair of upper and lower lift links 31, 32. Both mast members 29 are made of square pipes having a hollow cross section and extend in the vertical direction. At the lower end portion 29a, the mast members 29 are detachably attached to the rear portion of the traveling machine body 2 by fastening bolts 59, and the like. They are connected by a plurality of transverse members 33, and are configured in a cross beam shape when viewed from the direction of travel of the lawn mower 1.

  The both mast members 29 can be attached to the traveling machine body 2 in a detachable state by fastening with the bolts 59 to the rear ends of the side frames 3 in the traveling machine body 2 and the rear ends of the side frames 3. It is configured to be performed by fastening with a bolt 59 to the rear wheel support frame 3a extending downward from the front.

  Further, the both mast members 29 have an upper end portion 29b in front of the lower end portion 29a, which is a mounting portion for the traveling machine body 2, by a dimension E in a side view (FIGS. 1, 3, 4, and 6). An upper bracket member 34 configured with a rearward groove-shaped cross section on the rear surface of the upper end portion 29b of both mast members 29 is bent forward so as to be located on the (running vehicle body 2 side). Is fixed by welding or the like, and a lower bracket member 35 is fixed to the lower ends of both the mast members 29 so as to protrude rearward.

  The base ends of the pair of upper and lower lift links 31, 32 are inserted into the upper bracket member 34 in the groove in the upper bracket member 34 with respect to the upper bracket member 34 at the upper end portion 29 b of the both mast members 29. It is pivotally attached by lift pins 36 and 37 detachably inserted so as to penetrate the member 34.

  That is, the lift pins 36 and 37 with respect to the base ends of the lift links 31 and 32 have a structure that is supported at both ends with respect to the upper bracket member 34, so that the rigidity and durability of the support by the lift pins 36 and 37 are increased. In addition, since the base ends of the lift links 31 and 32 are inserted into the grooves in the upper bracket member 34, the support pins 37 and 37 have high support rigidity. Together, the lateral swing of the lift links 31 and 32 can be reliably reduced.

  Further, the upper and lower mast members 29 are configured to be bent forward so that the upper end 29b is positioned in front of the lower end 29a by an appropriate dimension E (the traveling machine body 2 side). The positions of the lift pins 36 and 37 at the base ends of the links 31 and 32 along the front-rear direction of the traveling machine body 2 are located in front portions by the appropriate dimension E as compared with the case where the mast member 29 is configured to be straight. Therefore, when the grass collection box 18 is moved up to the maximum as will be described later, the maximum rising height can be increased by the appropriate dimension E, and the grass collection box 18 can be increased. Since the point of action of the support load on the traveling machine body 2 in the box 18 is positioned forward by the appropriate dimension E, the rear load on the traveling machine body 2 can be reduced.

  On the other hand, the tip of the upper link 31 of the pair of upper and lower lift links 31, 32 is pivotally attached to the bracket member 22 fixed to the outside of the left and right side plates 18 b of the grass collection box 18 by a pin 38. The tip of the lower link 32 of the pair of upper and lower lift links 31, 32 is rotated with respect to the lower ends of the left and right side plates 18 b of the grass collection box 18 by a pivot pin 23 with respect to the bottom cover plate 20. It is pivotally attached.

  A pivot pin for the grass collection box 18 at the tip of the lower link 32 of the pair of upper and lower lift links 31, 32 is combined with a pivot pin 23 for the bottom cover plate 20 in the grass collection box 18. However, it goes without saying that the pivot pin for the tip of the lower link 32 and the pivot pin 23 for the bottom cover plate 20 can be configured separately.

  A lever body 40 is pivotally attached to each inner surface of the lower bracket member 35 at the lower ends of the mast members 29 by means of a pin 41. Between the lever bodies 40, the lever bodies 40 are connected to each other. The lever members 40 are integrally connected to each other so as to be rotated at the same time. The base end of the lifting hydraulic cylinder 30 is freely rotatable by a cylinder pivoting pin 43. It is connected to.

  In addition, when the lever body 40 is rotated backward, the lever body 40 is further rotated backward with respect to the stopper portion 44 at the rear end of the lower bracket member 35 when the cylinder pivot pin 43 is rotated. It is the structure that touches so as to prevent.

  In this case, instead of adopting a configuration in which the cylinder pivot pin 43 contacts the stopper portion 44, another stopper member provided on the lever body 40 contacts the stopper portion 44. It may be configured to do.

  In addition, the lever body 40 is rotated from the lower surface of the lower bracket member 35 in a state in which the lever body 40 is rotated backward and the cylinder pivot pin 43 is in contact with the stopper portion 44. An outrigger 45 that protrudes downward, and a bumper body that protrudes rearward to substantially the same position as the stopper portion 44 in the lower bracket member 35 or protrudes further rearward than the stopper portion 44. 46 is provided.

  Further, the lever bodies 40 are in contact with the lower bracket member 35 or the mast member 29 so as to prevent further forward rotation when the lever body 40 rotates forward. A stopper piece 47 is provided.

  Then, the tip ends of both the lifting hydraulic cylinders 30 are connected to the lower link 32 of the pair of upper and lower lift links 31, 32 by a pin 48 to connect the pair of upper and lower lift links 31, 32. , By turning up and down in both the lifting hydraulic cylinders 30, the grass collection box 18 has a forward attitude for receiving the mowing grass discharged from the discharge duct 14 in the lowered position, and this forward attitude. It is configured to reciprocate and move up and down in a state where it is lifted up as it is.

  That is, while the lifting-up hydraulic cylinder 30 lifts the grass-collecting box 18 in the forward-facing posture by the piston protruding motion, the lifting-up hydraulic cylinder 30 moves the piston-backing grass in the forward-facing posture to the original position. It is configured to descend.

  Of the pair of upper and lower lift links 31, 32, the lower link 32 has an upper end portion 29 b of both the mast members 29 or the first bracket member 34 when the grass collection box 18 is lifted high. The hook-shaped locking means 49 is detachably engaged so as to prevent downward rotation. The hook-shaped locking means 49 is provided on the upper link 31 or the mast members 29 are connected to each other. You may provide in the upper end part 29b or the 1st bracket member 34 side.

  In addition, the lift links 31 and 32 on the right side and the lift links 31 and 32 on the left side are connected to each other via the horizontal members 50 and 51 at the upper end portion so that these links rotate simultaneously. Are connected.

  Furthermore, a part of the lawn mower 1 that can be reached from the control seat 9 is provided with a PTO operation lever 52 for turning the rotary lawn mowing mechanism 13 on and off, An opening / closing operation lever 53 is provided for switching the hydraulic cylinder 26 to an open position where the piston protrudes, a closed position where the piston moves backward, and a neutral position where the piston operation stops in the middle. An elevating operation lever 54 is provided for switching 30 to a raised position where the piston protrudes, a lowered position where the piston moves backward, and a neutral position where the piston operation stops in the middle.

  In this configuration, the grass collection box 18 in the grass collection / discharge mechanism 16 is held in a lowered position with the bottom cover plate 20 and the rear cover plate 21 closed, so that the grass cut discharged from the discharge duct 14 is achieved. In this state, the lawn mower 1 can move forward while driving the rotary lawn mowing mechanism 13 to perform predetermined lawn mowing. The cut grass is collected through the discharge duct 14 and the bottom guide plate 28 so as to enter the grass collection box 18.

  When a predetermined amount of mowing grass accumulates in the grass collection box 18, the mowing operation and forward traveling are stopped, and the mowing grass discharge operation from the grass collection box 18 is started.

  In this discharge operation, first, the lifting cylinders 30 are lifted by operating both the lifting hydraulic cylinders 30 so that the piston protrudes by operating the lifting operation lever 54 to the raised position. .

  Then, first, the lever body 40 at the base end of both the lifting and lowering hydraulic cylinders 30 is rotated rearward so that the pivot pin 43 comes into contact with the stopper portion 44. As shown in FIG. The outrigger 45 provided on the lever body 40 protrudes so as to approach the ground 4, and the lawn mower 1 can be prevented from tilting backward so that the front part is lifted. At the same time, the bumper body 46 provided on the lever body 40 protrudes rearward to substantially the same position as the stopper portion 44 or protrudes further rearward than the stopper portion 44.

  That is, before the lifting operation of the grass collection box 18, the outrigger 45 protrudes so as to approach the ground 4, and the bumper body 46 protrudes rearward.

  Next, when the pair of upper and lower lift links 31 and 32 are rotated upward by further piston projecting movements in both the lifting and lowering hydraulic cylinders 30, the grass collection box 18 is moved in the direction shown in FIG. When the bottom cover 20 and the rear cover plate 21 are lifted in a closed state and are lifted to the highest position, the lift control levers 54 are operated to the neutral position to operate the lift hydraulic cylinders 30. Further, when the lifting of the grass collecting box 18 stops, the grass collecting box 18 is locked by the locking means 49 so as not to descend from the highest position.

  It should be noted that both the lifting hydraulic cylinders 30 can be configured to automatically reach a neutral position where the piston operation is stopped when the grass collection box 18 is lifted to the highest position. Further, when the grass collection box 18 is in a state of receiving the mowing grass discharged from the discharge duct 14 in the lowered position, the grass collection box 18 is inclined forward so that the front portion is low and the rear portion is high, but is lifted to the highest position. On the other hand, the rear part is inclined so that the front part is high and the rear part is low.

  In this state, the lawn mower 1 is operated so as to travel forward or backward so that the rear part approaches the grass collection container A placed on the ground 4 as shown in FIG. The grass collection box 18 lifted high as described above is positioned directly above the grass collection container A.

  When the lawn mower 1 travels backward so that the rear part of the lawn mower 1 approaches the grass collection container A, the bumper body 46 ensures that damage occurs due to the collision with the grass collection container A. Can be avoided.

  Then, the opening / closing hydraulic cylinder 26 is operated so that the piston protrudes by the operation of the opening / closing operation lever 53 to the open position.

  Then, as shown in FIG. 12, since the rear cover plate 21 with respect to the grass collection box 18 is opened and rotated, discharge of the cut grass in the grass collection box 18 into the grass collection container A starts.

  Next, the bottom cover plate 20 with respect to the grass collection box 18 is linked to the opening rotation of the rear cover plate 21 via a metal wire 27 having flexibility, as shown in FIG. Since the bottom end of the grass collection box 18 is opened by turning up so that the rear end is lowered, discharge of the cut grass in the grass collection box 18 further proceeds into the grass collection container A.

  When the rear cover plate 21 is fully opened, the opening / closing operation lever 53 is operated to the neutral position to stop further piston projecting movement in the both open / close hydraulic cylinders 26, that is, the opening operation of the rear cover plate 21. To do.

  The both opening and closing hydraulic cylinders 26 can be configured to be in a neutral position where the piston automatically stops operating when the rear cover plate 21 is fully opened.

  Next, with the discharge of the cut grass in the grass collection box 18, the cut grass that has been discharged and dropped hits the rear end of the bottom cover plate 20, so that the bottom cover plate 20 is in contact with the bottom cover plate 20 as shown in FIG. Since the metal wire 27 that interlocks and connects the bottom lid plate 20 and the rear lid plate 21 is loosened, it automatically opens and rotates even further regardless of the rear lid body 21 being pivoted. All of the cut grass in the grass box 18 can be discharged.

  It should be noted that, as described below, the opening and turning of the bottom lid plate 20 due to the cutting and falling grass hitting the rear end of the bottom lid plate 20 is configured to follow the opening and turning of the rear lid plate 21. Yes.

  That is, as shown in FIG. 9, a lever body 56 having a receiving piece 56a with which the lower surface of the rear end portion of the bottom cover plate 20 contacts the pivot pin 55 at the base end of the opening / closing hydraulic cylinder 26. The lever body 56 is provided so as to be rotatable, and the lever body 56 is turned to the lower link 25 via the link 57 in the downward direction as the lower link 25 is turned upward, that is, the rear cover plate 21 is turned in the opening direction. By connecting so as to rotate, the opening of the bottom lid 20 due to the cutting and falling grass hitting the rear end of the bottom lid 20, and the discharging of the grass by the opening and rotation of the bottom lid 20, can be rapidly performed. It is configured not to be performed at once.

  Thus, when the discharge of the cut grass into the grass collection container A in the grass collection box 18 is completed, the rear cover plate 21 is closed by operating the open / close operation lever 53 to the closed position. The bottom cover plate 20 is automatically closed by the weight at its front end.

  The opening / closing operation lever 53 is in a neutral position when the rear cover plate 21 is closed, but may be configured to automatically perform this.

  Therefore, after the lawn mower 1 is moved away from the grass collection container A, the lifting operation lever 54 is operated to the lowered position, and both the lifting hydraulic cylinders 30 are operated to move backward in the piston. As shown in FIG. 10, the grass collection box 18 descends and returns to the posture for receiving the cut grass discharged from the discharge duct 14.

  Next, when both the lifting hydraulic cylinders 30 are further moved backward by the pistons, the lever bodies 40 are rotated forward so that the pivot pins 43 are separated from the stopper portions 44, and the stopper pieces 47. Is rotated forward so as to contact the lower bracket member 35 or the mast member 29, the outrigger 45 and the bumper body 46 are returned to their original retracted positions as shown in FIG. Return to the state.

  The elevating operation lever 54 is in a neutral position when the two lever bodies 40 are rotated forward so as to contact the second bracket member 35 or the mast member 29. You can also

  In the above-described embodiment, the protrusion of the outrigger 45 is configured to be performed before (immediately before) the lifting of the grass collection box 18 is started. Can be configured to be performed after the start of lifting of the grass collection box 18 and until the grass box 18 is lifted to a height, that is, in the middle of lifting.

It is a side view which shows embodiment of this invention. It is a top view of FIG. It is the perspective view which removed the grass collection box in FIG. 1, and was seen from diagonally back. It is the perspective view which looked at the grass collection discharge mechanism in FIG. 1 from diagonally forward. FIG. 5 is a sectional view taken along line IV-IV in FIG. 4. It is a perspective view which shows the lift mechanism in the said grass collection discharge mechanism. It is a principal part enlarged view of FIG. It is the perspective view which looked at the grass collection box from diagonally forward in the maximum rising position. It is the perspective view which looked at the grass collection box from diagonally backward in the maximum rising position. It is a figure which shows the 1st state of a mowing grass discharge | release operation | work. It is a figure which shows the 2nd state of a mowing grass discharge | release operation | work. It is a figure which shows the 3rd state of a mowing grass discharge | release operation | work. It is a figure which shows the 4th state of a mowing grass discharge | release operation | work. It is a figure which shows the 5th state of a mowing grass discharge | release operation | work.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lawn mower 2 Traveling machine body 3 Side frame 4 Ground 5 Front wheel 6 Rear wheel 7 Engine 8 Steering handle 9 Steering seat 13 Rotary lawn mowing mechanism 14 Exhaust duct 15 Rope hanging tool 16 Grass collection mechanism 18 Grass collection box 19 Lift mechanism 20 Bottom lid plate 21 Rear lid plate 23 Pivoting pin for bottom lid plate 26 Hydraulic cylinder for opening and closing lid 27 Flexible wire 29 Mast member 30 Hydraulic cylinder for raising and lowering 31, 32 Lift link 34 Upper bracket member 35 Lower bracket member 36 , 37 Lift pin 38 Pivot pin 40 Lever body 41 Pivot pin 43 Pivot pin of lifting hydraulic cylinder 44 Stopper portion 45 Outrigger 46 Bumper body 52 PTO operation lever 53 Opening / closing operation lever 54 Lifting operation lever

Claims (3)

A lawn mowing mechanism, a grass collection box that accepts the grass cut by the lawn mowing mechanism in a forward posture, and a lift mechanism that lifts the grass collection box in a forward posture; In a lawn mower equipped with a rear cover plate so as to freely open and close the rear opening in
A bottom cover plate is provided for opening the bottom of the grass collecting box and closing the open bottom so that the open bottom can be freely opened and closed. The bottom cover plate is attached to the rear cover plate or its opening / closing mechanism to open the rear cover plate. Lawn mower characterized by being connected so as to open and rotate in conjunction with.   In the description of claim 1, the opening operation in the bottom cover plate is configured to rotate and open so that at least the front end portion of the bottom cover plate springs up into the grass collection box. Lawn mower.   In the description of claim 1, the opening operation in the bottom cover plate is configured to rotate so that the front end of the bottom cover plate jumps up into the grass collection box and the rear end portion is lowered. Lawn mower characterized by.

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