JP2005312313A - Traveling type lawn mower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smoothly discharge lawn grass even without largely inclining a grass collecting box 22 in a traveling type lawn mower, with which a traveling machine body 1 equipped with a mower apparatus is furnished with the grass collecting box 22 for holding lawn grass reaped by the mower apparatus so that the grass collecting box is changed from a grass collecting posture to receive reaped lawn grass to a discharge posture to discharge the accumulated lawn grass. <P>SOLUTION: A raking out member 70 projecting toward the inside of the grass collecting box 22 in a grass collecting posture is fastened to the traveling machine body 1 so that the raking out member does not interfere with the grass collecting box 22 and is relatively moved in the direction of the receiving opening 22a of the grass collecting box as the grass collecting box 22 is changed to a discharging posture. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a traveling lawn mower equipped with a mowing mechanism (mower device) for mowing turf grass planted on the ground, and more specifically, smoothly from a grass collection box that accommodates turf grass mowed by the mowing mechanism. It relates to a structure for discharging turfgrass.

In general, a traveling lawn mower includes a mower device that is mounted on the traveling machine body so as to be movable up and down, and a grass collection box that has a front opening that accommodates turf grass cut by the mower device. As an example of this type of lawn mower, Patent Document 1 describes a grass collection box that can be rotated so as to switch between a grass collection posture for receiving cut grass and a discharge posture for discharging accumulated turf grass. Are disclosed.
JP 2001-45829 A

  By the way, in the traveling type lawn mower described in Patent Document 1, by switching the grass collection box to a discharge posture in which the receiving port is opened substantially downward, the grass collected in the grass collection box is dropped naturally by its own weight. To the outside.

  In this case, in order to reliably discharge the turf grass in the grass collection box, the vertical inclination angle (rotation angle with respect to the horizontal) of the grass collection box in the discharge posture is equal to or greater than a predetermined angle (for example, 55 ° to 60 ° or more). Must be set to In other words, the grass collection box needs to be inclined at a predetermined angle or more.

  However, since the traveling lawn mower of Patent Document 1 is configured to switch the posture of the grass collection box by driving a hydraulic cylinder mounted on the traveling aircraft body, the posture switching circuit such as a hydraulic pump or a hydraulic pipe line is used. In addition to the extremely complicated structure of the hydraulic supply system for operation, there is a problem in that the increase in the number of parts causes an increase in size and an increase in manufacturing cost.

  Therefore, the present invention aims to provide a traveling lawnmower that solves the above problems and can smoothly discharge turfgrass from a grass collection box in a discharge posture.

  In order to solve this technical problem, the invention according to claim 1 is characterized in that a grass collection box that accommodates turf grass cut by the mowing mechanism on a traveling machine body to which the mowing mechanism is attached has a grass collecting posture and accumulation to receive the turf grass. It is a traveling lawn mower provided so as to be able to switch to a discharge posture for discharging the turfgrass, and a scraping member protruding toward the inside of the grass collection box in the grass collection posture However, it is fixed so as not to interfere with the grass collection box and to move relative to the receiving port as the grass collection box is switched to the discharge posture.

  According to a second aspect of the present invention, in the traveling type lawn mower according to the first aspect, the scraping member is disposed at an upper portion in the grass collection box in a grass collection posture.

  According to a third aspect of the present invention, in the traveling lawn mower according to the first or second aspect, the scraping member is configured to be adjustable in length in a direction protruding toward the inside of the grass collection box in a grass collection posture. It is what has been done.

  According to the first aspect of the present invention, the scraping member fixed to the traveling machine body is relatively moved in the direction of the receiving port without interfering with the grass collection box as the grass collection box is switched to the discharge posture. Therefore, even if the scraping member itself is not driven, the turf grass inside can be pushed out (scraped) by the scraping member from the stage where the vertical inclination angle of the grass collection box is small. Therefore, the turfgrass can be smoothly and reliably discharged from the grass collection box despite the extremely simple configuration.

  Moreover, according to the structure of Claim 2, since the said scraping member is arrange | positioned in the upper location in the said grass collection box at the time of grass collection attitude | position, the function which discharges | emits turf grass from a grass collection box to the exterior efficiently is maintained. However, there is an effect that the accommodation capacity of the grass collection box is hardly reduced.

  According to the configuration of claim 3, the scraping member is configured such that the length in the protruding direction toward the inside of the grass collection box in the grass collection posture is adjustable, so that the turf grass can be adjusted according to the size of the grass collection box. The scraping member can be easily set to an optimum length for scraping off. Therefore, it is easy to apply to grass collection boxes of various sizes, and there is an effect that versatility is high.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings.

  First, an outline of a traveling lawn mower will be described with reference to FIGS. 1 is an overall side view of the lawn mower, FIG. 2 is an overall plan view of the lawn mower, and FIG. 3 is a plan view showing a power transmission system of the lawn mower.

  As shown in FIGS. 1 and 2, the lawn mower traveling machine body 1 in this embodiment includes a body frame 2 having a gate shape in plan view. The body frame 2 is supported by front and rear four wheels 3, 3, 4, 4 arranged on the front and rear sides of the left and right sides.

  An engine 5 as a power source and a steering column unit 6 having a steering round handle 7 are mounted on the front upper surface of the traveling machine body 1. In the rear cowl 8 that covers the rear upper surface of the traveling machine body 1, there is a transmission case 9 such as an HST type (hydrostatic continuously variable transmission mechanism) that appropriately changes the output from the engine 5 and transmits it to the left and right rear wheels 4, 4. Is arranged (see FIG. 3).

  A driver seat 10 is provided on the rear cowl 8. When the operator sitting on the driver's seat 10 turns the steering round handle 7, the steering angles (steering angles) of the left and right front wheels 3 and 3 change according to the operation amount (turning amount). It is configured. On the left side of the driver's seat 10, a mower elevating lever 11 for elevating and operating a mower device 15 described later is provided so as to be able to rotate back and forth. On the right side of the driver's seat 10, a posture switching lever 12 that switches the posture of a grass collection box 22 to be described later is provided so as to be rotatable up and down. A shift pedal 13 for adjusting the vehicle speed and a brake pedal 14 for braking the traveling machine body 1 are provided upright on the rear surface (rear surface) side of the steering column section 6.

  A mower device 15 as a cutting mechanism can be moved up and down via a pair of front and rear link rods 16 and 17 between the left and right front wheels 3 and 3 and the left and right rear wheels 4 and 4 on the lower surface of the body frame 2. It is installed. The mower device 15 is provided with a pair of left and right rotary cutting blades 19 and 19 that can rotate horizontally in a mower case 18 having a downward opening hook shape (see FIG. 3).

  Further, four gauge wheels 20 that adjust the height of the mower device 15 when lowered are attached to the front and rear sides of the left and right sides of the mower case 18. A duct portion 18 a extending rearward from the mower case 18 communicates with a grass collection box 22 disposed at the rear portion of the traveling vehicle body 1 via a discharge duct 21 disposed between the left and right rear wheels 4, 4 on the lower surface of the vehicle body frame 2. doing.

  When each rotary cutting blade 19 is rotated in a state where the mower device 15 is placed on the ground, the turf grass planted on the ground is trimmed to a suitable height. Turf grass cut by each rotary blade 19 is accommodated in the grass collection box 22 from the mower device 15 via the discharge duct 21.

  Next, the power transmission system of the lawn mower will be described with reference to FIG. The lawn mower according to this embodiment employs a two-wheel drive system in which a part of the rotational power of the engine 5 is distributed to the left and right rear wheels 4 and 4.

  That is, a part of the rotational power of the engine 5 is forward from the rear end portion of the output shaft 23 protruding forward and backward outward from the engine 5 and the propulsion shaft 24 having universal joints at the front and rear ends and the transmission case 9. It is transmitted to the transmission case 9 via the traveling gear box 25 and the endless belt 26 arranged at the site.

  Then, left and right rear wheel drive shafts provided on the rear side of the traveling machine body 1 from a horizontal shaft (not shown) projecting outward in the left and right directions on the transmission case 9 via an endless chain (not shown). 29. As a result, the rear wheels 4 and 4 attached to the left and right ends of the rear wheel drive shaft 29 are rotationally driven.

  On the other hand, the other rotational power of the engine 5 is transmitted from the front end portion of the output shaft 23 to the PTO shaft 32 pivotally supported on the front portion of the body frame 2 via an endless belt 31 such as a power transmission belt. . Next, from the PTO shaft 32, an intermediate shaft 33 provided with universal joints at both front and rear ends, a mower gear box 34 disposed on the right side of the machine body frame 2 on the upper surface of the mower case 18, and an endless belt 35, Power is transmitted to the vertically long rotary shafts 36 and 36 rotatably supported on both sides of the mower case 18 across the body frame 2 in plan view. As a result, the left rotary cutting blade 19 is driven to rotate clockwise in plan view, and the right rotary cutting blade 19 is driven to rotate counterclockwise in plan view.

  Due to the rotation of the left and right rotary cutting blades 19, a conveying wind that flows backward from the mower case 18 toward the grass collection box 22 is formed. The conveying wind smoothly conveys the turf grass cut by the rotary cutting blades 19 to the grass collection box 22.

  Next, the structure of the grass collection box 22 will be described with reference to FIGS. 4 and 5. 4 is a side sectional view of the grass collection box, and FIG. 5 is a VV sectional plan view of FIG.

  The grass collection box 22 has a substantially box shape with an open front. The grass collection box 22 includes a frame frame 39 constituting the framework, a fixing bracket 40 for detachably mounting the frame frame 39 to the left and right rear ends of the body frame 2, and a net or a net covering the periphery of the frame frame 39 A cloth bag body 41 is provided. A lid cover body 42 is attached to the upper surface of the grass collection box 22 to prevent dust passing through the mesh of the bag body 41 from turning around to the traveling machine body 1 side.

  The fixing bracket 40 includes a pair of sheath pipes 40a and 40a that are detachably fitted to the left and right rear ends of the body frame 2 and are screw-fixed, and a left and right longitudinal pipe member 40b that connects the two sheath pipes 40a and 40a. I have.

  Both ends of a horizontal lateral support shaft 43 that is rotatably inserted into the pipe member 40 b are fixed to portions of the upper portion of the frame frame 39 near the receiving port 22 a. Thus, the grass collection box 22 has a grass collection posture in which the receiving port 22a faces the discharge port 21a of the discharge duct 21 (a posture when receiving turf grass cut by the mower device 15, see the solid line state in FIG. 1), and the receiving box 22a. It is configured to rotate up and down about the horizontal support shaft 43 as a rotation center so that the mouth 22a can be switched to a discharge posture (see the two-dot chain line state in FIG. 1) facing the ground.

  One end of the lateral support shaft 43 is rotated to the body frame 2 of the orientation switching lever 12 via the interlocking mechanism 44 so that the lateral support shaft 43 rotates in conjunction with the up-and-down rotation operation of the orientation switching lever 12. It is connected to a horizontal shaft portion 12a that is pivotally supported.

  The interlocking mechanism 44 is a substantially rod-shaped connecting rod 46 that connects the triangular arm 45 rotatably attached to one end of the lateral support shaft 43, and the triangular arm 45 and the transmission arm 48 fixed to the posture switching lever 12. , And an arm link 47 that is fixed to an outer side of the triangular arm 45 in one end portion of the lateral support shaft 43.

  In this embodiment, the connecting pin 50 is slidably inserted into the long slot 49 formed in the triangular arm 45 through the through hole formed in one end of the connecting rod 46 and cannot be removed. One end of the connecting rod 46 is connected to the triangular arm 45. The other end of the connecting rod 46 is pivotally attached to the transmission arm 48 by a pivot pin 51.

  In addition, the connecting pin 50 that connects the triangular arm 45 and the connecting rod 46 is also slidably inserted into the long slot 52 formed in the arm link 47 so that it cannot be removed. Accordingly, in conjunction with the up / down turning operation of the posture switching lever 12, the triangular arm 45, the arm link 47, and the lateral support shaft 43 rotate together with the lateral support shaft 43 as a rotational center.

  As shown in FIG. 5, a pair of compression springs 53 that urge the grass collection box 22 to rotate in the direction of the discharge posture are symmetrically provided between the lateral support shaft 43 and each of the sheath tubes 40a. It is attached. A fulcrum crossing link 55 formed in an arc shape so as to bypass the lateral support shaft 43 is disposed symmetrically at the rear end of the body frame 2. A tension spring 54 is mounted between each fulcrum crossing link 55 and the upper front end of the grass collection box 22.

  The urging force of the pair of left and right tension springs 54 is smaller than the urging force of each compression spring 53 when the grass collecting box is in a forward grass collecting posture. When the grass collection box 22 is switched from a forward grass collection posture to a forward obliquely downward posture (see the one-dot chain line state in FIG. 1), the two tension springs 54 exceed the lateral support shaft 43. Thereafter, the two tension springs 54 urge the grass collection box 22 to rotate further in the direction of the downward discharge posture.

  Engagement links 57 are fixed to both ends of the latch shaft 56 that is pivotally supported at the lower front end of the grass collection box 22 (frame frame 39). Each engagement link 57 is configured to be engaged with and disengaged from a flange 58 provided at a lower portion of the rear end of the discharge duct 21 by rotating around the latch shaft 56. One of the engagement links 57 is connected to one top portion of the triangular arm 45 located above the engagement link 57 via a substantially rod-shaped linkage 59.

  On the other hand, a base end of an elastic clip 61 made of, for example, a leaf spring and having a Ω-shaped cross section is bolted to the front inner surface of the lid cover body 42. When the cover cover body 42 is placed over the grass collection box 22, the elastic clip 61 is rotatable with respect to the horizontal shaft portion 62a of the gate-type frame 62 erected upward on both the sheath tubes 40a, 40a and is detachable. It can be fitted. The horizontal shaft portion 62 a of the portal frame 62 is located above the lateral support shaft 43 and in the vicinity of the uppermost portion of the rear end edge of the rear cowl 8.

  A guide rail 63 having a generally longitudinal and downward opening and an approximately bowl-like shape is bolted to a substantially central portion of the inner surface of the rear portion of the lid cover body 42, while a pair of left and right rolling rollers are disposed at the upper rear end of the frame frame 39. 64 and 64 project upward. Each of these rolling rollers 64 is fitted between the contact plate portion 63a projecting outward from the left and right side surfaces of the guide rail 63 and the rear inner surface of the lid cover body 42 so as to sandwich the guide rail 63 from both the left and right sides. .

  Therefore, the rear end portion of the lid cover body 42 switches the posture of the grass collection box 22 by the rolling rollers 64 that roll between the contact plate portion 63a of the guide rail 63 and the rear inner surface of the lid cover body 42. It is supported from below in such a manner that it can be displaced relative to the front-rear direction as it rotates.

  Next, the structure of the scraping member 70 for scraping the turf grass in the grass collection box 22 will be described with reference to FIGS. FIG. 6 is a schematic perspective view of the scraping member.

  As shown in FIGS. 4 and 5, a turf grass discharging scraping member 70 extending rearward is attachable to and detachable from the fixed bracket 40 located at an upper position in the grass collection box 22 in the grass collection posture. It is fixed to.

  In this embodiment, the scraping member 70 is formed in a rectangular frame shape by a pair of arms 71 and 72 having a substantially U-shaped hollow section. The left and right support portions 72a of the other scraping arm 72 corresponding to the left and right holder portions 71a of one holder arm 71 are slidably inserted along the longitudinal direction. In addition, each holder portion 71a of the holder arm 71 is formed with a through hole 71b that is arranged at an appropriate interval along the longitudinal direction, while each post portion 72a of the scraping arm 72 is associated with the holder portion 71a. Stopper holes 72b that can match the stop holes 72a are formed so as to be arranged at appropriate intervals along the longitudinal direction.

  With each post 72a of the scraping arm 72 inserted into the corresponding holder 71a of the holder arm 71 corresponding thereto, a stopper pin is inserted into the stopper hole 72b of each post 72a via the locking hole 71b on the holder 71a side. By inserting and fixing 73, the length L (see FIGS. 4 and 5) of the scraping member 70 in the sliding direction (the protruding direction toward the grass collection box 22 in the grass collection position) is adjusted stepwise.

  The length L in the sliding direction of the scraping member 70 is set to a length that does not hinder the posture switching rotation of the grass collection box 22. In other words, in the side view of FIG. 4, the relative movement trajectory (see the alternate long and short dash line) of the scraping member 70 with respect to the grass collection box 22 is set to fall within the grass collection box. Moreover, the left-right width dimension of the scraping member 70 is set smaller than the internal dimension between the left and right sheath tubes 40a, 40a (see FIG. 5).

  Therefore, the scraping member 70 does not interfere with the grass collection box 22 even when the posture is switched and rotated (the frame frame 39, the bottom surface, etc. do not come in contact).

  The base 71c of the holder arm 71 and the horizontal shaft portion 62a of the portal frame 62 are detachably connected by fastening a pair of upper and lower clamp plates 74, 74 sandwiching both of them with bolts 75 and nuts 76. Yes. In this embodiment, the upper clamp body 74 is fixed to the base 71 c of the holder arm 71 by welding or the like.

  A substantially C-shaped hook-like portion 71d that is hooked from behind on the pipe member 40b of the fixing bracket 40 is fixed to the middle portion of each holder portion 71a in the holder arm 71 by welding or the like. The scraping member 70 is held around the pipe member 40b (around the lateral support shaft 43) so as not to rotate by hooking the both hook-shaped portions 71d on the pipe member 40b from the rear.

  In the above configuration, when the posture switching lever 12 is turned upward, the transmission arm 48 rotates in the clockwise direction of FIG. 4 around the horizontal shaft portion 12a, so that the connecting rod 46 connected to the transmission arm 48 is moved. The triangular arm 45 is rotated counterclockwise in FIG. Then, since the triangular arm 45 pulls up the linkage 59, the left and right engagement links 57 are disengaged from the flange 58 of the discharge duct 21, and the engagement is released. The grass collection box 22 is configured such that the receiving port 22a is inclined forward and downward by the urging force of the left and right compression springs 53, the urging force of the pair of left and right tension springs 54 beyond the fulcrum, or the operation force of the posture switching lever 12. It turns to a downward discharge posture (see the one-dot chain line state in FIG. 1).

  Here, the scraping member 70 located in the upper part of the inside of the grass collection box 22 at the time of the grass collection posture is related to the grass collection box 22 as the grass collection box 22 switches to the discharge posture and rotates. Then, since it moves relatively in the direction of the receiving port 22a without interfering with the frame 39 or the like, the internal turf grass is pushed out by the scraping member 70 from the stage where the vertical inclination angle of the grass collection box 22 is small. The grass collection box 22 can be easily changed in posture by manual operation of the posture switching lever 12, and the grass grass can be discharged from the grass collection box 22 smoothly and reliably (the smoothness of the grass). Helping to reduce emissions).

  Further, the scraping member 70 is configured to discharge the turf grass in the grass collection box 22 by moving relative to the grass collection box 22 using the posture switching rotation of the grass collection box 22. There is no need to drive 70 itself. Therefore, the turfgrass can be efficiently discharged from the grass collection box 22 to the outside despite the extremely simple configuration.

  Further, since the scraping member 70 is fixed to the fixing bracket 40 located at an upper position in the grass collection box 22 in the grass collection posture, there is little possibility of affecting the accommodation capacity of the grass collection box 22. In other words, there is almost no possibility of reducing the accommodation capacity of the grass collection box 22. Needless to say, in order to secure the area of the scraped surface for scraping the turf grass, a plate member may be arranged at the rear portion of the scraped member 70 or a plurality of rod-shaped members may be laid horizontally.

  Since the scraping member 70 of this embodiment is configured to be able to adjust the length L in the protruding direction toward the grass collection box 22 in the grass collection position, the scraping member 70 is scraped out according to the size of the grass collection box 22. The scraping member 70 can be easily set to the optimum length. Therefore, it is easy to apply to a collection box of various sizes, and is highly versatile. Note that the configuration for adjusting the length of the scraping member 70 is not limited to the above-described stepwise configuration, and may be a configuration for adjusting the length continuously.

  Further, since the scraping member 70 is detachably fixed to the fixing bracket 40, for example, the scraping member 70 is attached or detached depending on the work situation such as when a large amount of turf grass is accommodated in the grass collection box. Can improve user convenience.

  FIG. 7 shows another example of the scraping member. In this example, the left and right sheath tubes 40a, 40a of the fixed bracket 40 are extended backward to a length that does not hinder the posture switching rotation of the grass collection box 22, and between the sheath tubes 40a, 40a. The reinforcing bars 77 (three in FIG. 7) are provided at appropriate intervals, and are different from those of the above-described embodiment.

  Also in this case, the extending portions of the two sheath tubes 40a and 40a are not interfering with the frame frame 39 and the like as the grass collection box 22 is switched to the discharge posture and rotated in relation to the grass collection box 22. Since it moves relatively in the direction of the receiving port 22a, the function exhibited by these two sheath tubes 40a, 40a is not different from the scraping member 70 described above. Therefore, similarly to the above-described embodiment, the turfgrass can be smoothly and reliably discharged from the grass collection box 22. As described above, it is preferable to arrange a plurality of reinforcing bars 77 between the two sheathed tubes 40a, 40a because it is possible to secure a wide area of the scraped surface for scraping the turf grass.

  The present invention is not limited to the above-described embodiment, and can be embodied in various forms. For example, the scraping member is not limited to the above-described rectangular frame shape, and various shapes can be adopted as long as the grass can be scraped.

It is the whole lawn mower side view. It is a whole top view of a lawn mower. It is a top view which shows the power transmission system of a lawn mower. It is a sectional side view of a grass collection box. FIG. 5 is a VV plan sectional view of FIG. 4. It is a schematic perspective view of a scraping member. It is a schematic plan view which shows another example of a scraping member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Traveling machine body 2 Machine body frame 5 Engine 12 Attitude switching lever 15 Mower apparatus as a mowing mechanism 18 More case 19 A pair of left and right rotary cutting blades 20 Gauge wheel 21 Discharge duct 21a Discharge port 22 Grass collecting box 39 Frame frame 40 Fixed bracket 40a Sheath tube 40b Pipe member 41 Bag body 42 Lid cover body 43 Horizontal support shaft 44 Interlocking mechanism 70 Scraping member 71 Holder arm 71a Holder part 71b Locking hole 71c Base part 71d Saddle-like part 72 Scraping arm 72a Post part 72b Stopper hole 73 Stopper pin 74 Clamp Board

Claims (3)

A traveling box equipped with a mowing mechanism is provided so that a grass collecting box that accommodates turfgrass harvested by the mowing mechanism can be switched between a grassing attitude for receiving turfgrass and an attitude for discharging accumulated turfgrass. A traveling lawn mower
The traveling body has a scraping member protruding toward the inside of the grass collection box in the grass collection posture, and does not interfere with the grass collection box, and the receiving port is switched as the grass collection box is switched to the discharge posture. A traveling lawn mower characterized by being fixed so as to move relative to a direction.   The traveling lawn mower according to claim 1, wherein the scraping member is disposed at an upper portion of the grass collection box in a grass collection posture.   3. The traveling lawn mower according to claim 1, wherein the scraping member is configured to be adjustable in length in a direction protruding toward the inside of the grass collection box in a grass collection posture.

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