JP2006051043A - Lawn mower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lawn mower that can improve the working efficiency in the mulching mode, as the working efficiency of the bagging mode is retained and the finish level of mowing also is increased. <P>SOLUTION: In this lawn mowing machine 10, the output shaft 15a is extended from the engine downward and the housing 11 that is made openable downward is set under the engine, the cutting blade 14 received in the housing is attached to the output shaft. The cut grass outputting pass 21 is extended from the housing to the rear upward and a shutter 40 is set to the pass opening 24 of the cut grass conveying pass and the cut grass receiving bag is detachably set to the output of the cut grass-conveying pass and the grass cut with the cutting blade is collected through the conveying pass into the receiving body. The housing is equipped with a scroll part 11d in order to allow the cut grass run toward the output pass as the cut grass is allowed to slew around in the housing. The shutter is constituted with the shaft 44 that vertically extending near the passing opening and the shutter part 47 that is swingably set to the shaft. The opening degree of the passing opening is adjusted with a shutter. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an improved technique for a rotary lawn mower.

  The rotary lawn mower cuts turf grass by rotating a cutting blade housed in a lower open housing along the turf grass. Such lawn mowers include (1) lawn mowers of the type used in so-called bagging mode in which turf grass mowed with a cutting blade is stored in a mowed lawn storage body such as a bag, and (2) turf grass mowed with a cutting blade. There is a lawn mower of the type used in the so-called mulching mode, which is further finely cut in the housing and discharged below the housing. The lawn mower of the above (1) can remove all of the mowed turf grass (mowing lawn), so that the lawn mower finish is good and is often used in golf courses and the like. The lawn mower of (2) above is frequently used in parks and the like because it eliminates the need for the “mowing lawn” operation by returning the lawn to the lawn.

However, this is inconvenient because two lawnmowers are used according to the purpose. Therefore, in recent years, a technology that can serve as both (1) and (2) has been developed with a single lawn mower (see, for example, Patent Document 1-2).
Japanese Examined Patent Publication No. 64-3441 (page 1-3, FIGS. 1 to 4) U.S. Pat. No. 4,951,449 (page 4, FIGS. 1A-1B, 8)

  According to Patent Document 1, the prior art (1) can be set in a bagging mode type housing by attaching a grass discharge chute to the top plate of the housing as shown in FIGS. In this case, by attaching a bag to the exit of the grass discharge chute, turf grass mowed by the cutting blade can be stored in the bag (bagging mode).

  Further, as shown in FIGS. 1 and 2, the conventional technique (1) can be switched to a mulching mode type housing by removing the grass discharge chute and attaching a cover plate to the top plate of the housing. In this case, the turf grass mowed by the cutting blade can be discharged below the housing (mulching mode).

  According to Patent Document 2, prior art (2) is a bagging mode type housing in which the grass discharge chute extends from the top plate to the rear upper side as shown in FIGS. 1B and 8. The bagging mode type housing includes a scroll portion for turning the turf grass mowed by the cutting blade toward the grass discharge chute while turning the housing. By removing the chute plug that blocks the grass discharge chute and attaching the bag to the grass discharge chute, the grass cut by the cutting blade can be stored in the bag (bagging mode).

  In the above conventional technique (2), as shown in FIG. 1A, the grass discharge chute is closed with a chute plug, so that the grass cut by the cutting blade can be discharged below the bagging mode type housing (mulching). mode).

  The conventional technique (1) switches between a bagging mode type housing and a mulching mode type housing by manually exchanging parts. Since it is necessary to replace parts manually every time switching is performed, the replacement work is cumbersome and not efficient.

On the other hand, in the conventional technique (2), the bagging mode type housing can be switched between the bagging mode and the mulching mode by simply attaching and detaching the chute plug to the grass discharge chute. For this reason, the mode switching operation is relatively simple.
However, even in the mulching mode, the bagging mode type housing is used as it is. As described above, the bagging mode type housing includes a scroll portion for turning the turf grass cut by the cutting blade (cutting grass) toward the grass discharge chute while rotating in the housing.

  On the other hand, in the mulching mode, the cut grass is swung in the housing, and is further finely cut with a cutting blade and discharged below the housing. The cross-sectional area in the housing is large at the portion where the scroll portion is present and small at the portion where the scroll portion is absent. For this reason, the flow of air for turning the cut grass in the housing, that is, the flow velocity of the turning flow, can vary greatly between the portion with the scroll portion and the portion without the scroll portion. The rapid change in the flow velocity of the swirling flow can be a factor that mowing grass stays in the housing.

For example, if the flow velocity rapidly decreases in the vicinity of the rear end of the scroll portion, cut grass accumulates on the inner surface of the housing at this portion, or cut grass accumulates at the entrance of the grass discharge chute. If it accumulates to some extent in a housing, the flow of a swirl flow will fall. If the mowing work is temporarily interrupted and the accumulated mowing lawn is removed each time, continuous work cannot be performed. In this case, the work efficiency in the mulching mode is inferior, so there is room for improvement.
In addition, if cut grass is partially accumulated in the housing, the cut grass cannot be uniformly discharged downward from the housing. In this case, the return amount of the mowing lawn that returns from the housing to the turf becomes uneven, so that the mowing finish is inferior.

  Therefore, an object of the present invention is to provide a technique capable of enhancing the working efficiency in the mulching mode and enhancing the lawn mowing finish while ensuring the working efficiency in the bagging mode.

According to the first aspect of the present invention, the output shaft extends downward from the power source, a lower open housing is provided under the power source, a cutting blade housed in the housing is attached to the output shaft, The lawn grass that has been trimmed to the housing with a cutting blade is provided with a member that opens and cuts off the lawn carrying path, extends to the rear upper part, and is provided with a member that opens and closes the lawn lawn carrying path. By having a scroll part for turning to the cutting lawn carry-out passage while turning the inside of the housing,
When the cut grass transport passage is opened, the turf grass cut by the cutting blade is stored in the cut grass storage body via the cut grass transport passage, and when the cut grass transport passage is blocked, the turf grass cut by the cutting blade is stored. In a lawn mower that discharges the bottom of the housing,
The member that opens and blocks the cut grass transport passage is a shutter provided in the passage opening of the cut grass transport passage,
The shutter includes a vertically extending shaft provided in the vicinity of the passage opening in the cut grass transport passage, and a shutter member that opens and closes the passage opening by swinging on the shaft. The shutter opens the passage opening. It is configured to adjust the degree.

  According to a second aspect of the present invention, in the first aspect, the guide portion along the scroll portion is provided on the lower side of the top plate of the housing, and the rear edge of the guide portion in the guide direction is provided on the housing in the cut grass transport passage It is made to oppose the channel | path opening which faces.

  The invention according to claim 3 is characterized in that, in claim 2, the height of the trailing edge in the guide direction of the guide portion is set higher than the lower end of the passage opening, and the trailing edge in the guide direction is configured in a wave shape.

The invention according to claim 4 extends the output shaft downward from the power source, provides a lower open housing under such a power source, attaches a cutting blade accommodated in the housing to the output shaft, The lawn grass that has been trimmed to the housing with a cutting blade is provided with a member that opens and cuts off the lawn carrying path, extends to the rear upper part, and is provided with a member that opens and closes the lawn lawn carrying path. By having a scroll part for turning to the cutting lawn carry-out passage while turning the inside of the housing,
When the cut grass transport passage is opened, the turf grass cut by the cutting blade is stored in the cut grass storage body via the cut grass transport passage, and when the cut grass transport passage is blocked, the turf grass cut by the cutting blade is stored. In a lawn mower that discharges the bottom of the housing,
A guide part along the scroll part is provided under the top plate of the housing,
The guide direction rear edge of the guide portion is opposed to the passage opening facing the housing in the cutting lawn carry-out passage with a gap, and is generally directed to the lower end of the passage opening,
The member that opens and closes the cut grass transport passage is a plug member that puts in and out of the cut grass transport passage,
When the plug member is inserted into the cut grass transport passage, the cut grass transport passage is cut off, so that it protrudes into the scroll portion from the passage opening of the cut grass transport passage, and the protruding tip is opposed to the trailing edge in the guide direction. It extends to the vicinity of the trailing edge in the guide direction, and the lower end of the plug member is set to be substantially the same height as the trailing edge in the guide direction.

In the invention which concerns on Claim 1, the opening degree of a channel | path opening can be arbitrarily adjusted with a shutter. Therefore, with a simple shutter opening operation, the bagging mode in which the shutter is fully opened and the cut grass is stored in the cut grass storage body, the mulching mode in which the shutter is fully closed and the cut grass is discharged below the housing, and the shutter is optional. Can be appropriately switched between the bagging mode and the intermediate mode of the mulching mode. In addition, it is not necessary to exchange parts each time switching to each mode.
Further, by operating the shutter to an arbitrary opening degree, it is possible to freely and finely set the discharge form of the cut grass according to the state of the turf, the finishing condition and the preference.

In the invention which concerns on Claim 2, a guide part is put along the scroll part for making a lawn lawn move in a bagging mode type housing, and making it go to a lawn carrying out passage, and this guide part is made into the top plate of a housing. Since the guide direction rear edge of the guide portion is opposed to the passage opening facing the housing in the cut grass carrying-out passage, the air flow for turning the cut grass in the housing, that is, the swirling flow The flow direction can be guided while gradually changing toward the passage opening at the guide portion.
Moreover, since the guide portion along the scroll portion is provided on the lower side of the top plate of the bagging mode type housing, the cross-sectional area in the housing can be gently changed between the portion with and without the scroll portion. . Since the change in the cross-sectional area is gradual, the flow velocity of the swirling flow changes gently between the portion with the scroll portion and the portion without the scroll portion.

  For this reason, in the mulching mode in which the cutting lawn carry-out passage is blocked, the swirling flow guided by the guide portion continues a smooth swirling motion within the housing. For this reason, it is difficult for mowing grass to accumulate in the housing. Since mowing lawn does not accumulate, lawn mowing work can be performed continuously. As a result, the working efficiency in the mulching mode can be increased. Moreover, the cut grass can be discharged uniformly from the housing downward. For this reason, since the return amount of the cut grass that returns from the housing to the turf is uniform, the finishing performance of the cut grass is improved.

On the other hand, in the bagging mode in which the cut grass carrying-out passage is opened, the swirling flow (conveying flow) guided by the guide section flows from the passage opening to the cut grass carrying-out passage and carries the cut grass to the cut grass storage body. The work efficiency in the bagging mode can be ensured.
As described above, according to the second aspect, it is possible to increase the working efficiency in the mulching mode and to improve the lawn mowing finish while ensuring the working efficiency in the bagging mode.

  In the invention according to claim 3, since the height of the guide direction rear edge of the guide portion for directing the cut grass to the cut grass carrying-out passage is set higher than the lower end of the passage opening, in the intermediate mode, The cut grass that swirls along can be easily taken into the cut grass carrying-out passage. As a result, a necessary amount of cut grass can be reliably stored in the cut grass storage body via the cut grass carrying-out passage. Therefore, in the intermediate mode, the ratio between the amount of cut grass stored in the cut grass storage body and the amount of cut grass discharged below the housing can be set relatively accurately. Workability in the intermediate mode can be further improved.

  Furthermore, in the invention according to claim 3, since the guide direction trailing edge of the guide portion is wave-shaped, the flow of air in the concave portion and the flow of air in the convex portion interfere with each other in the waveform, thereby generating vortex flow. It is possible to suppress the flow of air flowing into the passage opening. As a result, the cut grass easily flows to the passage opening in the bagging mode or the intermediate mode. Therefore, the cut grass can be smoothly flowed to the cut grass storage body via the cut grass carrying-out passage and stored more reliably.

In the invention according to claim 4, the guide portion is placed along the scroll portion for turning the cut grass in the bagging mode type housing while moving the cut grass toward the cut grass carrying-out passage, and the guide portion is attached to the top plate of the housing. Since the guide direction rear edge of the guide portion is opposed to the passage opening facing the housing in the cut grass carrying-out passage, the air flow for turning the cut grass in the housing, that is, the swirling flow The flow direction can be guided while gradually changing toward the passage opening at the guide portion.
Moreover, since the guide portion along the scroll portion is provided on the lower side of the top plate of the bagging mode type housing, the cross-sectional area in the housing can be gently changed between the portion with and without the scroll portion. . Since the change in the cross-sectional area is gradual, the flow velocity of the swirling flow changes gently between the portion with the scroll portion and the portion without the scroll portion.

  For this reason, in the mulching mode in which the cutting lawn carry-out passage is blocked, the swirling flow guided by the guide portion continues a smooth swirling motion within the housing. For this reason, it is difficult for mowing grass to accumulate in the housing. Since mowing lawn does not accumulate, lawn mowing work can be performed continuously. As a result, the working efficiency in the mulching mode can be increased. Moreover, the cut grass can be discharged uniformly from the housing downward. For this reason, since the return amount of the cut grass that returns from the housing to the turf is uniform, the finishing performance of the cut grass is improved.

On the other hand, in the bagging mode in which the cut grass carrying-out passage is opened, the swirling flow (conveying flow) guided by the guide section flows from the passage opening to the cut grass carrying-out passage and carries the cut grass to the cut grass storage body. The work efficiency in the bagging mode can be ensured.
As described above, according to the fourth aspect, it is possible to increase the work efficiency in the mulching mode and improve the lawn mowing finish while ensuring the work efficiency in the bagging mode.

  Further, in the invention according to claim 4, since the trailing edge of the guide portion in the guide direction is generally directed to the lower end of the passage opening, the flow direction of the swirling flow is gradually lowered toward the bottom of the passage opening at the guide portion. You can guide while changing. For this reason, the cross-sectional area in the housing can be changed more gently between the portion with and without the scroll portion. Since the change in the cross-sectional area is more gradual, the flow velocity of the swirling flow changes more gently between the portion with and without the scroll portion. As a result, in the mulching mode, the swirling flow guided by the guide portion continues smoother swirling motion within the housing. For this reason, local accumulation of cut grass in the housing can be further prevented. For this reason, more continuous lawn mowing work can be performed, so that the work efficiency in the mulching mode can be further increased, and the amount of return of the mowing lawn that returns from the housing to the turf is increased to increase the uniformity of the lawn mower finish. Can be further enhanced.

  Further, in the invention according to claim 4, the member that opens and closes the cut grass carrying-out passage is constituted by a plug member (plug) that is taken in and out of the cut grass carrying-out passage, and the plug member is provided in the guide of the guide portion in the housing. By extending toward the trailing edge in the direction, the bagging mode type housing can be switched between the bagging mode and the mulching mode only by inserting / removing the plug member into / from the cut grass transport passage. Such a mode switching operation is simple and can be switched in a short time.

Further, in the invention according to claim 4, when the cutting lawn carrying passage is blocked by inserting the plug member into the cutting lawn carrying passage, the plug member is projected into the scroll portion from the passage opening of the cutting lawn carrying passage, The protruding tip extends to the vicinity of the trailing edge in the guide direction so as to face the trailing edge in the guide direction, and the lower end of the plug member is set at almost the same height as the trailing edge in the guide direction. In the mulching mode, the swirl flow guided by the guide portion passes under the plug member.
In this way, the swirling flow guided by the guide portion can be further guided by the lower end of the plug member while gradually changing to a portion where there is no scroll portion. For this reason, the cross-sectional area in the housing can be changed more gently between the portion with and without the scroll portion. Since the change in the cross-sectional area is more gradual, the flow velocity of the swirling flow changes more gradually between the portion with and without the scroll portion. As a result, in the mulching mode, the swirling flow guided by the guide portion continues a smoother swirling motion within the housing. For this reason, local accumulation of cut grass in the housing can be further prevented.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. “Front”, “Rear”, “Left”, “Right”, “Up”, “Down” follow the direction seen from the operator, Fr is front, Rr is rear, L is left, R is right CL indicates the center of the machine width. The drawings are to be viewed in the direction of the reference numerals.

  FIG. 1 is a perspective view of a lawn mower according to the present invention. This lawn mower 10 includes left and right front wheels 12 and 12 at a front portion of a housing 11 as a fuselage, and left and right traveling wheels at a rear portion of the housing 11. Rear wheels 13, 13 (only the left of the left and right are shown in this figure), a single lawn mowing blade 14 is provided inside the center of the housing 11, and the rear wheels 13, 13 and the mowing are provided above the housing 11. An engine 15 that drives the blade 14 is provided, and a continuously variable transmission (not shown) interposed between the engine 15 and the rear wheels 13 and 13 is provided inside the rear portion of the housing 11 and operated backward from the housing 11. It is a walking type self-propelled working machine that extends the handle 16 and cuts grass.

  FIG. 2 is a left side view of the lawn mower according to the present invention. The output shaft 15a is extended downward from the engine 15 as a power source, and a lower open housing 11 is provided under the engine 15, and the housing 11 The cutting blade 14 housed in the inside is attached to the output shaft 15a, the mowing lawn carry-out passage 21 having a substantially rectangular cross section is extended rearward and upward from the housing 11, and a storage body attachment portion 22 is provided at the exit of the mowing lawn carry-out passage 21. The turf grass mowed by the cutting blade 14 (hereinafter referred to as “mowing”) is detachably attached to the storage body attaching portion 22 such as a grass bag storage body 23 such as a glass bag (ie, the cut grass storage body 23 at the outlet). "Turf") is stored in the cut grass storage body 23 through the cut grass carrying-out passage 21.

  Further, this figure shows that the housing cover 31 is attached to the rear upper part of the housing 11 so as to be swingable up and down, and the operating handle 16 is provided with a cutting blade clutch lever 32, a traveling clutch lever 33 and a traveling speed change lever 34.

  FIG. 3 is a plan view of a lawn mower according to the present invention. This lawn mower 10 cuts turf grass and rotates it in the housing 11 by rotating the cutting blade 14 in the clockwise direction as shown by the arrow Ra. It is possible to generate an air flow such as a hollow arrow Rb, that is, a swirling flow (conveyance flow), and feed the cut grass into the cut grass storage body 23. In addition, the lawn mower 10 can be moved forward to advance the lawn mower.

  FIG. 4 is a bottom view of the lawn mower according to the present invention. The lawn mower 10 is provided with a shutter 40 in a passage opening 24 facing the housing 11 in the cut grass transport passage 21, so that the passage opening is made by the shutter 40. The opening degree of 24 is adjusted. That is, the shutter 40 is a member that opens and blocks the cut grass transport passage 21.

  In the bagging mode, the housing 11 has a spiral casing (spiral case) provided with a scroll portion 11d for turning the cut grass toward the cut grass carrying-out passage 21 while making a swiveling motion as indicated by a white arrow Rb in the housing 11. , Scroll case), that is, a bagging mode type housing.

Specifically, the housing 11 has a cylindrical outer cylinder part 11b and an inner cylinder part 11c smaller in diameter than the outer cylinder part 11b arranged concentrically with the axis SC of the output shaft 15a, and rearward from the outer cylinder part 11b. The cut grass carrying-out passage 21 is extended in the tangential direction of the outer cylinder portion 11b.
The scroll portion 11d is a space surrounded by the top plate 11a, the outer cylinder portion 11b, and the inner cylinder portion 11c, and is continuous with the passage opening 24 facing the housing 11 in the cut grass transport passage 21.

Furthermore, the housing 11 is configured to efficiently perform the operation in the mulching mode by sufficiently turning the cut grass in the housing 11 as indicated by the white arrow Rc by the turning flow.
Specifically, the guide portion 70 is placed along the scroll portion 11 d, the guide portion 70 is provided below the top plate 11 a of the housing 11, and the guide direction rear edge 71 of the guide portion 70 faces the passage opening 24. (Ie, facing each other).
Reference numeral 72 denotes a front portion in the guide direction of the guide portion 70, and 81 denotes a scroll plate.

As is apparent from this figure, the lawn mower 10 can arrange the guide part 70 and the scroll plate 81 at intervals on both sides of the passage opening 24 along the scroll part 11d.
The height of the guide part 70 and the scroll plate 81 in the scroll part 11d is substantially the same. Therefore, despite the provision of the cut grass carrying-out passage 21 in the housing 11, the cross-sectional change (change in cross-sectional shape and size) of the scroll portion 11d is relatively small. As a result, the air and the cut grass can be smoothly and sufficiently swiveled by the scroll portion 11d.

FIG. 5 is a cross-sectional view taken along line 5-5 of FIG. 4. At the position of the scroll portion 11d, the mowing lawn carry-out passage 21 is extended rearward and upward from the housing 11, and Indicates that
Specifically, the cutting lawn carry-out passage 21 includes a top plate 21a extending from the middle of the top plate 11a of the housing 11 to the rear upper side, a bottom plate 21b extending from the middle of the height of the outer cylinder portion 11b of the housing 11 to the rear upper side, It is a passage having a substantially rectangular cross section, which is composed of left and right side plates 21c and 21c (only the right side plate 21c is shown in this figure) between the top plate 21a and the bottom plate 21b.

“A passage opening 24 facing the housing 11 of the cut grass transport passage 21” refers to a base end portion of the top plate 21a with respect to the housing 11, a base end portion of the bottom plate 21b, and left and right side plates (left and right vertical walls) 21c and 21c. An opening surrounded by a proximal end portion.
As is clear from the above, since there is no bottom plate 21b in the passage opening 24 portion of the cutting lawn carry-out passage 21, it is not a substantially rectangular cross section, but a lower open channel-like cross section (lower open substantially U-shaped cross section). , A substantially U-shaped cross-section upside down).
As a matter of course, the lower end of the passage opening 24, that is, the base end 21 d of the bottom plate 21 b with respect to the outer cylinder portion 11 b is lower than the top plate 11 a of the housing 11.

  By the way, in the mulching mode, the lawn mower 10 raises the turf grass mowed by the cutting blade 14 (see FIG. 4) while turning it in the scroll portion 11d by the cutting blade 14, and falls after reaching the vicinity of the top plate 21a. The cut portion is further finely cut with a cutting blade 14 and discharged to the lower side of the housing 11.

As a matter of course, the lawn mower 10 raises the mowing lawn while turning it in the scroll portion 11d by the cutting blade 14 even in the bagging mode or the intermediate mode. Since the portion of the passage opening 24 in the cut grass transport passage 21 has the above-described structure, when the shutter 40 is opened to enter the bagging mode or the intermediate mode, the cut grass during the turning motion is removed from the passage opening 24 as indicated by an arrow. Easy to enter the cut grass transport passage 21.
21e is a base end part of the top plate 21a with respect to the top plate 11a.

  Further, in this figure, in the scroll part 11d, a guide part 70 is provided with a certain gap downward from the top plate 11a, and the height of the guide direction rear edge 71 of the guide part 70 is set to a dimension H1 from the lower end of the passage opening 24. Only shows that it is set high.

  Since the height of the trailing edge 71 in the guide direction of the guide portion 70 for directing the cut grass toward the cut grass carrying-out passage 21 is set higher than the lower end of the passage opening 24, it turns along the guide portion 70 in the intermediate mode. The mowing lawn that moves can be easily taken into the mowing lawn carry-out passage 21. As a result, a necessary amount of cut grass can be reliably stored in the cut grass storage body 23 (see FIG. 1) via the cut grass transport passage 21. Therefore, in the intermediate mode, the ratio between the amount of cut grass stored in the cut grass storage body 23 and the amount of cut grass discharged below the housing 11 can be set relatively accurately. Workability in the intermediate mode can be further improved.

Here, the configuration of the housing 11 will be described collectively with reference to FIGS. 4 and 5.
The housing 11 is configured such that a spiral scroll portion 11d is connected to a passage opening 24 of the cut grass transporting passage 21 extending rearward and upward. For this reason, the top plate 11a is formed so as to become higher as it advances in the scroll direction of the scroll portion 11d (indicated by the white arrow Rc in FIG. 4), that is, deeper toward the back side of the page in FIG. is there.

  In other words, as shown in FIG. 4, the height of the top plate 11 a in the scroll portion 11 d is the lowest at the portion where the scroll plate 81 is provided, and becomes higher as it proceeds in the direction of the white arrow Rc. The connected part is the highest.

  In this embodiment, in the scroll portion 11d, the portion provided with the scroll plate 81 is referred to as “the portion without the scroll portion”, and the remaining portion not provided with the scroll plate 81 is referred to as “the portion with the scroll portion”. I will decide.

  In this embodiment, the guide part 70 is placed along the scroll part 11 d for turning the cut lawn in the bagging mode type housing 11 toward the cut lawn carry-out passage 21, and the guide part 70 is attached to the housing 11. Since it is provided on the lower side of the top plate 11a and the guide direction rear edge 71 of the guide portion 70 is opposed to the passage opening 24, the flow of air for turning the cut grass in the housing 11, that is, the flow of the turning flow The direction Rc (the direction of the white arrow Rc) can be guided by the guide portion 70 while being gradually changed toward the passage opening 24.

  Moreover, since the guide portion 70 along the scroll portion 11d is provided on the lower side of the top plate 11a of the bagging mode type housing 11, the cross-sectional area in the housing 11 is changed between the portion where the scroll portion 11d is present and the portion where the scroll portion 11d is not present. It can be changed slowly. Since the change in the cross-sectional area is gradual, the flow velocity of the swirling flow changes gently between the portion with and without the scroll portion 11d.

  For this reason, in the mulching mode in which the cut grass transport passage 21 is shut off, the swirling flow guided by the guide unit 70 continues the smooth swirling motion in the housing 11. For this reason, it is difficult for mowing grass to accumulate in the housing 11. Since mowing lawn does not accumulate, lawn mowing work can be performed continuously. As a result, the working efficiency in the mulching mode can be increased. Moreover, the cut grass can be discharged uniformly from the housing 11 downward. For this reason, since the return amount of the cut grass that returns from the housing 11 to the turf is uniform, the finish of the mowing is improved.

On the other hand, in the bagging mode in which the cut grass transport passage 21 is opened, the swirling flow (transport flow) guided by the guide unit 70 flows from the passage opening 24 to the cut grass transport passage 21 and cuts into the cut grass storage body 23. Unload the turf. The work efficiency in the bagging mode can be ensured.
Thus, while ensuring the work efficiency in the bagging mode, the work efficiency in the mulching mode can be enhanced and the finishing performance of the lawn mowing can be enhanced.

  6 is a cross-sectional view taken along line 6-6 in FIG. 4 and shows that the guide portion 70 is attached to the housing 11 with a plurality of bolts 75 (... indicates a plurality, the same applies hereinafter).

  FIGS. 7A and 7B are configuration diagrams around the guide direction rear edge of the guide portion, and FIG. 7A is a perspective view of the guide direction rear edge 71 of the flat guide portion 70 as viewed from below. (B) is sectional drawing which looked at the relationship of the guide direction rear edge 71 with respect to the housing 11 from the side. (A) shows that the guide direction rear edge 71 of the flat guide part 70 has a wave shape in which the concave parts 71a... And the convex parts 71b.

  In general, when the cutting blade 14 (see FIG. 4) is rotated, an air flow along the guide portion 70 is generated below the guide portion 70. This flow tends to be a vortex in the guide direction trailing edge 71. If the eddy current is excessive, the mowing lawn is easily caught in the eddy current. As a result, in the bagging mode or the intermediate mode, it becomes difficult for the cut grass to flow to the passage opening 24 (see FIG. 4).

  In contrast, in the present invention, since the guide direction trailing edge 71 of the guide portion 70 is wave-shaped, the air flow W1 of the recesses 71a... And the air flow W2 of the projections 71b. By interfering with each other, generation of vortex can be suppressed and the flow of air flowing to the passage opening 24 can be adjusted. As a result, the cut grass easily flows to the passage opening 24 in the bagging mode or the intermediate mode. Therefore, the cut grass can be smoothly flowed to the cut grass storage body 23 (see FIG. 1) via the cut grass carrying-out passage 21 (see FIG. 4) and stored more reliably.

  FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 3, and the shutter 40 is provided in the vicinity of the passage opening 24 adjacent to the left and right side plates 21c, that is, one of the left and right vertical walls 21c. A rotary shaft 44 extending vertically, a vertical plate-shaped vertical shielding portion 45 that attaches a swing base end to the rotational shaft 44 and opens and closes the passage opening 24 by a swing operation, and a housing attachment portion from the lower end of the vertical shielding portion 45 22 (see FIG. 5), a horizontal plate-like horizontal shielding portion 46 that closes the lower portion of the passage opening 24, and an opening operation lever 53 (operation lever 53) connected to the rotary shaft 44. The shutter 40 can be swung by the opening operation lever 53.

  Specifically, the shutter 40 has a lower bearing 42 attached to the lower portion of the left side plate 21c of the cut grass transport passage 21 with a support bracket 41, and an upper bearing 43 attached to the top plate 21a of the cut grass transport passage 21. The rotary shaft 44 is rotatably supported by the upper bearings 42 and 43, and the vertical shield 45 and the horizontal shield 46 are attached to the rotary shaft 44.

  As is clear from this figure, the cut grass transport passage 21 and the shutter 40 are higher than the cutting blade 14. Therefore, even if the cutting blade 14 rotates, there is no fear of interfering with the cut grass transport passage 21 and the shutter 40.

  The rotary shaft 44 is attached to the tip of the opening operation lever 53 so that it can swing up and down and restricts the left and right swings, and the opening operation lever 53 is provided on the neutral side (positioning groove 56b) indicated by a solid line, such as a torsion spring. It is bulleted by the return spring 54. The vertical shielding part 45 and the horizontal shielding part 46 constitute a shutter member 47 formed integrally by bending a plate material into a substantially L shape in a side view. By rotating the rotating shaft 44 with the opening operation lever 53, the shutter member 47 can swing in the front and back direction in this figure.

FIG. 9 is a perspective view around the housing and the opening operation lever according to the present invention. An operation guide portion 56 is provided on the upper surface of the rear portion of the housing 11, and the operation guide portion 56 guides the operation of the opening operation lever 53. Indicates that
The operation guide portion 56 has a horizontally long guide hole 56a through which the opening operation lever 53 is inserted, and a plurality of vertically long positioning grooves 56b arranged along the long guide hole 56a. The positioning grooves 56b... Extend downward from the guide slot 56a. Reference numeral 55 denotes a grip.

FIG. 10 is a plan sectional view showing the relationship between the housing, the cutting blade, the passage opening of the cut grass carrying-out passage and the shutter according to the present invention, and the passage opening 24 can be opened and closed by the shutter member 47 provided in the cut grass carrying-out passage 21. Indicates that
As is apparent from this figure, the base end of the right side plate 21c is on the tangent line of the outer cylinder portion 11b and the base end of the left side plate 21c is on the tangent line of the inner cylinder portion 11c. is there.

  As described above, the passage opening 24 of the cutting lawn carry-out passage 21 is the base end 21e of the top plate 21a (see FIG. 5) with respect to the housing 11, the base end portion of the bottom plate 21b, and the base end portions of the left and right side plates 21c and 21c. It is the opening part of the substantially crescent moon shape of planar view enclosed. As shown in FIG. 10, the rotation shaft 44 and the vertical shielding portion 45 are disposed in this opening portion. By doing in this way, the flow of the mowing lawn can be made smoother in the bagging mode in which the vertical shield 45 is fully opened or in the intermediate mode in which the vertical shield 45 is half open.

However, in the mulching mode in which the vertical shield 45 is fully closed, the cut grass carrying-out passage 21 is in communication with the scroll portion 11d through the passage opening 24. In this case, the effect of closing the vertical shield 45 is halved. In order to prevent this, a horizontal plate-shaped horizontal shielding portion 46 that extends from the lower end of the vertical shielding portion 45 toward the housing mounting portion 22 side and closes the lower portion of the passage opening 24 is provided. As a result, when the vertical shielding portion 45 is fully closed, it is possible to enhance the blocking effect of blocking the cut grass transport passage 21 with respect to the scroll portion 11d.
In this way, each operation in the bagging mode, the mulching mode, and the intermediate mode can be performed more efficiently by using one housing 11.

  The operation guide unit 56 is a member that serves as a guide for the opening operation lever 53 when operating the opening of the shutter 40, and includes, for example, five positioning grooves 56b. The position of the positioning groove 56b facing one end of the guide slot 56a defines the fully closed position, and the position of the positioning groove 56b facing the other end of the guide slot 56a defines the fully open position. The interval between the positioning grooves 56b... May be set to an interval at which the opening degree of the shutter 40 is 25%, for example.

Next, the operation of the lawn mower 10 configured as described above will be described with reference to FIGS.
FIG. 10 shows that the shutter member 47 is operated to the fully closed position (opening degree 0%) by setting the opening operation lever 53 to the fully closed position. By closing the passage opening 24 with the shutter member 47, the lawn mower 10 can be set to a format used in the mulching mode. A part of the passage opening 24 is blocked by a lateral shielding part 46.

In this case, the cut grass revolves in the direction of the arrow in the housing 11, that is, in the scroll portion 11d, below the passage opening 24. As a result, the cut grass can be further finely chopped by the cutting blade 14 in the housing 11 and discharged below the housing 11.
From this state, the shutter member 47 can be opened by swinging clockwise in the figure.

  FIG. 11 is an operation diagram (part 1) of the lawn mower according to the present invention, which is shown in correspondence with FIG. This figure shows that the shutter member 47 is operated to the half-open position (opening 50%) by setting the opening operation lever 53 to the half-open position. By opening the passage opening 24 by an arbitrary opening with the shutter member 47, the lawn mower 10 is set to a mode for use in the intermediate mode (intermediate mode between the bagging mode and the mulching mode), and one of the turf grass mowed by the cutting blade 14. The rest can be stored in the cut grass storage body 23 (see FIG. 1) while returning the part to the ground. Also in this case, a part of the passage opening 24 is blocked by the horizontal shielding part 46.

  FIG. 12 is an operation diagram (part 2) of the lawn mower according to the present invention, which is shown in correspondence with FIG. This figure shows that the shutter member 47 is operated to the fully open position (opening degree 100%) by setting the opening operation lever 53 to the fully open position. When the shutter member 47 is set at the fully open position, the vertical shield 45 is adjacent to the inner surface of the left side plate 21c. By fully opening the passage opening 24, the lawn mower 10 can be set to the type used in the bagging mode, and the turf grass mowed by the cutting blade 14 can be stored in the cut grass storage body 23 (see FIG. 1).

  Thus, the shutter 40 is provided in the passage opening 24 facing the housing 11 in the cut grass carrying-out passage 21 extending rearward from the lower open housing 11, and the shutter 40 is connected to one of the left and right sides of the cut grass carrying-out passage 21. A vertically extending rotary shaft 44 provided adjacent to the vertical wall 21c and in the vicinity of the passage opening 24, and a vertical plate-like vertical shielding portion 45 that opens and closes the passage opening 24 by swinging by attaching a swing base end to the rotary shaft 44. And a horizontal plate-like horizontal shielding portion 46 that extends from the lower end of the vertical shielding portion 45 toward the housing mounting portion 22 side and closes the lower portion of the passage opening 24, and an opening operation lever 53 connected to the rotary shaft 44. Therefore, the opening degree of the passage opening 24 can be arbitrarily adjusted by the shutter 40.

  Therefore, the baggage mode in which the shutter 40 is fully opened and the cut grass is stored in the cut grass storage body 23 (see FIG. 1) by simply opening the shutter 40 with a simple configuration, and the shutter 40 is fully closed and the cut grass is in the housing 11. The mulching mode for discharging to the lower side, and the shutter 40 can be set to an arbitrary opening and appropriately switched between the bagging mode and the intermediate mode of the mulching mode. In addition, it is not necessary to exchange parts each time switching to each mode.

  Further, by operating the shutter 40 to an arbitrary opening degree, it is possible to freely and precisely set the discharge form of the cut grass according to the state of the turf, the finishing condition and the preference. Furthermore, by switching to the intermediate mode, the discharge flow rate of the cut grass discharged from the housing 11 to the cut grass storage body 23 can be reduced. As a result, the time for the cut grass to accumulate in the cut grass storage body 23 is extended, so that the replacement frequency of the cut grass storage body 23 can be reduced.

  Furthermore, in order to efficiently perform the work in the bagging mode, the housing 11 is provided with a scroll portion 11d for turning the cut grass toward the cut grass carrying-out passage 21 while rotating the cut grass in the housing 11. Further, in order to efficiently perform the work in the mulching mode, the guide portion 70 is placed along the scroll portion 11d, and the guide portion 70 is provided on the lower side of the top plate 11a of the housing 11. 71 faced the passage opening 24.

Therefore, when the shutter 40 is opened as shown in FIG. 12, the scroll portion 11d and the guide portion 70 (see FIG. 5) can smoothly guide the cut grass to the passage opening 24 while turning the cut grass.
As shown in FIG. 10, when the shutter 40 is closed, the guide lawn 70 (see FIG. 5) guides the cut grass that is turning around the scroll portion 11 d so as to smoothly flow along the shutter 40 in the closed state. can do. The same applies to the intermediate mode.
In this way, each work in the bagging mode, the mulching mode, and the intermediate mode can be performed more efficiently by using one housing 11.

  By the way, as described above, the housing 11 includes the cylindrical outer cylinder portion 11b and the inner cylinder portion 11c with the axis SC (see FIG. 4) as the center, and the cut grass transport passage 21 in the tangential direction of the outer cylinder portion 11b. The shutter 40 is provided in the passage opening 24 facing the housing 11. The direction in which the mowing lawn carry-out passage 21 extends from the outer tube portion 11b matches the rotation direction Ra of the cutting blade 14. In other words, the cutting lawn carry-out passage 21 extends in the tangential direction of the rotation locus of the cutting blade 14. The passage opening 24 is open in the rotation direction Ra of the cutting blade 14.

Out of the cut grass transport passage 21, the outer side plate 21c extends in the tangential direction of the outer cylinder portion 11b, and the inner side plate 21c extends in the tangential direction of the inner cylinder portion 11c. The rotating shaft 44 of the shutter 40 is disposed in the vicinity of the inner side plate 21c. For this reason, the swing tip of the shutter member 47 is on the outer side plate 21c side. The shutter member 47 opens in the rotation direction Ra of the cutting blade 14. As a matter of course, when the vertical shielding part 45 of the shutter member 47 is opened by a certain angle, the displacement amount of the vertical shielding part 45 on the swing front end side is larger than the displacement amount on the swing base end side. For this reason, when opening the vertical shielding part 45 by a certain angle, the passage opening 24 can be opened relatively large by the outer peripheral part of the vertical shielding part 45 that is largely displaced.
Furthermore, the turning speed when the cutting lawn turns in the housing 11 by the rotation of the cutting blade 14 increases as the distance from the axis SC increases.

  As is clear from the above, in the intermediate mode, the opening (the larger than 0% and from 100%) of the passage opening 24 of the cutting lawn carry-out passage 21 extending in the tangential direction of the outer cylinder portion 11b. When opened only by a small opening), the cut grass that turns at high speed on the outer peripheral side of the housing 11 easily flows from the passage opening 24 to the cut grass carrying-out passage 21. For this reason, in the intermediate mode, the stowability of the cut grass can be further improved.

The above description is summarized as follows.
In general, the lawn mower used in the bagging mode makes the turf grass mowed by the cutting blades turn toward the cut grass transport passage while rotating in the housing. Therefore, the shape of the housing in the bagging mode is generally spiral.
On the other hand, the lawn mower used in the mulching mode is a machine that further cuts turf grass mowed with a cutting blade into finer portions with a cutting blade in a housing. Therefore, the cross-sectional shape of the mulching mode housing is substantially uniform.
Thus, the shape of the housing used for the bagging mode is different from the shape of the housing used for the mulching mode.

  On the other hand, the above-described embodiment is a lawn mower 10 that performs operations in the bagging mode, the mulching mode, and the intermediate mode by using one housing 11, and in order to efficiently perform the operation in the bagging mode, the scroll unit 11 d was provided in the housing 11. Further, in order to efficiently perform the work in the mulching mode, the guide portion 70 is placed along the scroll portion 11d, and the guide portion 70 is provided on the lower side of the top plate 11a of the housing 11. 71 faced the passage opening 24.

  When the shutter 40 is opened, the scroll lawn 11d and the guide part 70 can smoothly guide the cut grass to the passage opening 24 while turning the cut grass. When the shutter 40 is closed, it can be guided by the guide unit 70 so that the cut grass moving in the scroll portion 11d smoothly flows along the shutter 40 in the closed state. The same applies to the intermediate mode. In this manner, the bagging mode, the mulching mode, and the intermediate mode can be performed more efficiently by using one housing 11.

  FIG. 13 is an operation diagram (part 3) of the lawn mower according to the present invention, which is shown in correspondence with FIG. This figure is a view of the lawn mower 10 when the shutter 40 is in the fully closed position, as viewed from the housing mounting portion 22 side.

  FIG. 14 is an operation diagram (part 4) of the lawn mower according to the present invention, which is shown in correspondence with FIG. This figure is a view of the lawn mower 10 when the shutter 40 is in the half-open position, as viewed from the housing mounting portion 22 side.

  FIG. 15 is an operational view (No. 5) of the lawn mower according to the present invention, which is shown in correspondence with FIG. This figure is a view of the lawn mower 10 when the shutter 40 is in the fully open position, as viewed from the housing attachment portion 22 side.

  Next, modified examples of the lawn mower 10 will be described with reference to FIGS. In addition, about the same structure as the Example shown in the said FIGS. 1-15, the same code | symbol as the said Example is attached | subjected and the description is abbreviate | omitted.

FIG. 16 is a left side view of the lawn mower according to the present invention (modified example), and FIG. 17 is a plan view of the lawn mower (modified example) according to the present invention.
In the lawn mower 100 according to the modified example, a lid 101 that can be opened and closed is provided at the exit of the cut grass transport passage 21, and a member that opens and closes the cut grass transport passage 21 is a plug member (in and out of the cut grass transport passage 21. Plug) 180, and a guide part 170 is provided in the scroll part 11d.

  FIG. 18 is a bottom view of a lawn mower (modified example) according to the present invention. Referring to FIG. 17 described above, the lawn mower 100 according to the modified example is for moving the mowed grass toward the mowed grass carrying-out passage 21 while turning the mowed grass in the housing 11 in order to efficiently perform the operation in the bagging mode. In order to provide the housing 11 with the scroll portion 11d and to efficiently perform the operation of the mulching mode, the guide portion 170 is provided along the scroll portion 11d, and the guide portion 170 is provided below the top plate 11a of the housing 11. The rear edge 171 in the guide direction of the guide portion 170 is opposed to (that is, faced to) the passage opening 24. Hereinafter, these configurations will be described in detail.

  The plug member 180 extends into the housing 11 toward the guide direction rear edge 171 of the guide portion 170. More specifically, the plug member 180 inserted from the exit side (the right side in the figure) of the mowing lawn carry-out passage 21 protrudes into the scroll portion 11d from the passage opening 24, and the front end 181 thereof faces the rear edge 171 in the guide direction. In order to do so, it was extended to the vicinity of the trailing edge 171 in the guide direction while curving along the scroll portion 11d.

  FIG. 19 is a cross-sectional view taken along line 19-19 in FIG. 18, and at the position of the scroll portion 11d, the mowing lawn carry-out passage 21 is extended rearward and upward from the housing 11, and the storage body mounting portion 22 is connected to the exit of the mowing lawn carry-out passage 21. Indicates that

Further, in this figure, in the scroll portion 11d, a guide portion 170 is provided with a certain gap downward from the top plate 11a, and the guide direction rear edge 171 of the guide portion 170 is the lower end of the passage opening 24, that is, the base end of the bottom plate 21b. 21d indicates that it is generally directed. Li is a directional line in which the guide direction rear edge 171 points to the lower end of the passage opening 24.
The plug member 180 is characterized in that the lower end 182 is set at substantially the same height as the trailing edge 171 in the guide direction, that is, on the directional line Li.

  The lid 101 is to be closed after removing the cut grass storage body 23 indicated by an imaginary line and inserting and setting the plug member 180 into the cut grass transport passage 21. The plug member 180 can be prevented from coming off by closing the exit of the cut grass transport passage 21.

Here, the structure of the housing 11 and the scroll part 11d is demonstrated, referring FIG.18 and FIG.19.
The scroll part 11d of the modified example is a space surrounded by a top plate 11a, an outer cylinder part 11b, and a spiral inner wall 11e formed radially outward of the inner cylinder part 11c, and a cut grass carrying passage 21 is connected to the passage opening 24 facing the housing 11.

  The housing 11 is configured such that a spiral scroll portion 11d is connected to a passage opening 24 of the cut grass transporting passage 21 extending rearward and upward. For this reason, the top plate 11a is formed so as to become higher as it advances in the scroll direction of the scroll portion 11d (indicated by the white arrow Rc in FIG. 18), that is, deeper toward the back side of the page in FIG. is there.

In other words, as shown in FIG. 18, the height of the top plate 11 a in the scroll portion 11 d is the lowest at the scroll base end portion 11 f and becomes higher as it proceeds in the direction of the white arrow Rc, and is a portion that continues to the passage opening 24. Is the highest.
In this modification, the portion extending from the scroll base end portion 11f in the direction of the white arrow Rc and continuing to the passage opening 24 is referred to as a “portion having a scroll portion”. A portion from the portion connected to the passage opening 24 to the direction of the white arrow Rc to the scroll base end portion 11f is a “portion 11g without the scroll portion 11d”.

  20 is a cross-sectional view taken along the line 20-20 in FIG. 19, and shows that the guide portion 170 is attached to the housing 11 with a plurality of bolts 175 (... indicates a plurality; the same applies hereinafter).

  FIG. 21 is a perspective view of a plug member according to the present invention. The plug member 180 is formed by integrally forming a bottom plate 183, a side plate 184 extending upward from one side end of the bottom plate 183, and a knob 185 extending upward from the center of the bottom plate 183.

Next, the operation of the modified example of the above configuration will be described with reference to FIGS.
FIG. 22 is an operation diagram of the lawn mower (modified example) according to the present invention, and is a diagram corresponding to FIG.

  As shown in FIGS. 18 and 19, the lawn mower 100 according to the modified example includes a guide part 170 on a scroll part 11 d for turning the cut lawn in the bagging mode type housing 11 toward the cut lawn carrying-out passage 21. The guide portion 170 is provided below the top plate 11 a of the housing 11, and the guide direction rear edge 171 of the guide portion 170 is opposed to the passage opening 24. The flow of air that turns the turf, that is, the flow direction Rc of the swirling flow (in the direction of arrow Rc) can be guided by the guide portion 170 while gradually changing toward the passage opening 24.

  In addition, since the guide portion 170 along the scroll portion 11d is provided below the top plate 11a of the bagging mode type housing 11, the cross-sectional area in the housing 11 is divided into a portion where the scroll portion 11d is present and a portion 11g where the scroll portion 11d is not present. Can be changed slowly. Since the change in the cross-sectional area is gradual, the flow velocity of the swirling flow changes gently between the portion with the scroll portion 11d and the portion 11g without the scroll portion 11d.

  For this reason, in the mulching mode in which the cut grass transport passage 21 is blocked, the swirl flow guided by the guide portion 170 continues smooth swirl movement within the housing 11. For this reason, it is difficult for mowing grass to accumulate in the housing 11. Since mowing lawn does not accumulate, lawn mowing work can be performed continuously. As a result, the working efficiency in the mulching mode can be increased. Moreover, the cut grass can be discharged uniformly from the housing 11 downward. For this reason, since the return amount of the cut grass that returns from the housing 11 to the turf is uniform, the finish of the mowing is improved.

On the other hand, as shown in FIG. 22, in the bagging mode in which the cut grass transport passage 21 is opened, the swirl flow (transport flow) guided by the guide portion 170 flows from the passage opening 24 to the cut grass transport passage 21. The cut grass is carried out to the cut grass storage body 23. The work efficiency in the bagging mode can be ensured.
Thus, while ensuring the work efficiency in the bagging mode, the work efficiency in the mulching mode can be enhanced and the finishing performance of the lawn mowing can be enhanced.

  Further, as shown in FIGS. 18 and 19, since the guide direction rear edge 171 of the guide portion 170 is generally directed to the lower end of the passage opening 24, that is, the base end 21d of the bottom plate 21b, the swirling flow direction Rc is set to be the same. The guide portion 170 can guide while gradually changing the passage opening 24 downward. For this reason, the cross-sectional area in the housing 11 can be changed more gently between the portion with the scroll portion 11d and the portion 11g without the scroll portion 11d. Since the change in the cross-sectional area is more gradual, the flow velocity of the swirling flow changes more gently between the portion with the scroll portion 11d and the portion 11g without the scroll portion 11d.

  As a result, in the mulching mode, the swirl flow guided by the guide unit 170 continues a smooth swirl movement in the housing 11. For this reason, local accumulation of cut grass in the housing 11 can be further prevented. For this reason, more continuous lawn mowing work can be performed, so that the working efficiency in the mulching mode can be further increased, and the amount of return of the mowing lawn that returns from the housing 11 to the turf is increased to increase the uniformity of the lawn mower finish. The sex can be increased.

  Furthermore, a member that opens and closes the cut grass transport passage 21 is configured by a plug member 180 that is inserted into and removed from the cut grass transport passage 21, and the plug member 180 is inserted into the housing 11 in the guide direction rear edge of the guide portion 170. By extending toward 171, the bagging mode type housing 11 can be switched between the bagging mode and the mulching mode only by inserting / removing the plug member 180 to / from the cut grass transport passage 21. Such a mode switching operation is simple and can be switched in a short time.

  Furthermore, since the lower end 182 of the plug member 180 extending toward the guide direction rear edge 171 of the guide portion 170 is set at substantially the same height as the guide direction rear edge 171, the cutting lawn carry-out passage 21 is formed by the plug member 180. In the blocked mulching mode, the swirl flow guided by the guide portion 170 passes under the plug member 180. In this way, the swirling flow guided by the guide portion 170 can be further guided by the lower end 182 of the plug member 180 while being gently changed to the portion 11g where the scroll portion 11d is not present.

  For this reason, the cross-sectional area in the housing 11 can be changed more gently between the portion with the scroll portion 11d and the portion 11g without the scroll portion 11d. Since the change in the cross-sectional area is more gradual, the flow velocity of the swirling flow changes more gradually between the portion with the scroll portion 11d and the portion 11g without the scroll portion 11d. As a result, in the mulching mode, the swirling flow guided by the guide portion 170 continues a smoother swirling motion within the housing 11. For this reason, local accumulation of cut grass in the housing 11 can be further prevented.

In the above-described embodiments and modifications of the present invention, the power source is not limited to the engine 11 and may be, for example, an electric motor.
The cut grass storage body 23 is not limited to a glass bag, and may be a box, for example.
The vertical shielding part 45 and the horizontal shielding part 46 may be configured so that the opening degree of the passage opening 24 can be adjusted, and the shape, size, and material thereof are arbitrary.
The shutter member 47 may be any member as long as it can attach the swing base end of the vertical shielding portion 45 to the rotation shaft 44 as a result. For example, only the swing base end of the vertical shielding portion 45 is attached to the rotation shaft 44 or the rotation shaft 44. Includes a configuration in which only the swing base end of the horizontal shielding portion 46 is attached.
The shape, size, and material of the guide portions 70 and 170 are arbitrary.
The rear edge 71 in the guide direction only needs to have a wave shape, and the shapes and dimensions of the recess 71a and the protrusion 71b are arbitrary.

1 is a perspective view of a lawn mower according to the present invention. It is a left view of the lawn mower which concerns on this invention. It is a top view of the lawn mower according to the present invention. It is a bottom view of the lawn mower according to the present invention. FIG. 5 is a sectional view taken along line 5-5 of FIG. FIG. 6 is a sectional view taken along line 6-6 of FIG. It is a block diagram around the guide direction rear edge of a guide part. FIG. 8 is a sectional view taken along line 8-8 in FIG. 3. It is a perspective view around a housing and an opening operation lever according to the present invention. It is a plane sectional view showing the relation of the housing concerning the present invention, a cutting blade, the passage opening of a cut grass carrying-out passage, and a shutter. It is an effect | action figure (the 1) of the lawn mower which concerns on this invention. It is an effect | action figure (the 2) of the lawn mower which concerns on this invention. It is an effect | action figure (the 3) of the lawn mower which concerns on this invention. It is an effect | action figure (the 4) of the lawn mower which concerns on this invention. It is an effect | action figure (the 5) of the lawn mower which concerns on this invention. It is a left view of the lawn mower (modification) concerning the present invention. It is a top view of the lawn mower (modification) concerning the present invention. It is a bottom view of the lawn mower (modification) concerning the present invention. FIG. 19 is a cross-sectional view taken along line 19-19 in FIG. 18. FIG. 20 is a cross-sectional view taken along line 20-20 in FIG. 19. It is a perspective view of the stopper member concerning the present invention. It is an action figure of a lawn mower (modification) concerning the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10,100 ... Lawn mower, 11 ... Housing, 11a ... Top plate of housing, 11d ... Scroll part, 14 ... Cutting blade, 15 ... Power source (engine), 15a ... Output shaft, 21 ... Mow lawn carrying passage, 21c ... Vertical wall (side plate) of cut grass transport passage, 21d ... lower end of passage opening (base end of bottom plate), 22 ... storage body mounting portion, 23 ... cut grass storage body, 24 ... passage opening, 40 ... shutter (open / block) 44 ... rotating shaft, 45 ... vertical shielding part, 46 ... lateral shielding part, 47 ... shutter member, 53 ... operating lever, 70,170 ... guide part, 71,171 ... guide direction trailing edge, 71a, 71b ... concave and convex portions at the trailing edge in the guide direction, 180 ... plug member (member to be opened / closed), 182 ... lower end of the plug member, Li ... directivity line, SC ... axis of the output shaft.

Claims (4)

The output shaft is extended downward from the power source, a lower open housing is provided under such a power source, a cutting blade housed in this housing is attached to the output shaft, and the lawn is carried out rearward and upward from the housing Extending the passage, providing a member for opening and closing the cutting lawn carry-out passage, removably attaching the cut grass storage body to the outlet of the cut lawn carry-out passage, and mounting the lawn grass cut by the cutting blade on the housing in the housing By providing a scroll portion for turning to the cutting lawn carry-out passage while making a swivel motion,
When the mowing lawn carrying passage is opened, the turf grass cut by the cutting blade is stored in the mowing lawn storage body via the mowing lawn carrying passage, and when the mowing lawn carrying passage is blocked, the mowing grass is cut by the cutting blade. In a lawn mower that discharges turf grass under the housing,
The member that opens and blocks the cut grass transport passage is a shutter provided in the passage opening of the cut grass transport passage,
The shutter includes a vertically extending shaft provided in the vicinity of the passage opening in the cutting lawn carry-out passage, and a shutter member that opens and closes the passage opening by swinging on the shaft. A lawn mower characterized in that it is configured to adjust the opening degree.   A guide portion along the scroll portion is provided on the lower side of the top plate of the housing, and a rear edge in the guide direction of the guide portion is opposed to a passage opening facing the housing in the cut grass transporting passage. The lawn mower according to claim 1.   The lawn mower according to claim 2, wherein the height of the guide direction rear edge of the guide portion is set higher than the lower end of the passage opening, and the guide direction rear edge is formed in a wave shape. The output shaft is extended downward from the power source, a lower open housing is provided under such a power source, a cutting blade housed in this housing is attached to the output shaft, and the lawn is carried out rearward and upward from the housing Extending the passage, providing a member for opening and closing the cutting lawn carry-out passage, removably attaching the cut grass storage body to the outlet of the cut lawn carry-out passage, and mounting the lawn grass cut by the cutting blade on the housing in the housing By providing a scroll portion for turning to the cutting lawn carry-out passage while making a swivel motion,
When the mowing lawn carrying passage is opened, the turf grass cut by the cutting blade is stored in the mowing lawn storage body via the mowing lawn carrying passage, and when the mowing lawn carrying passage is blocked, the mowing grass is cut by the cutting blade. In a lawn mower that discharges turf grass under the housing,
A guide portion along the scroll portion is provided below the top plate of the housing,
The guide direction rear edge of the guide portion is opposed to the passage opening facing the housing in the cut grass transport passage with a space therebetween, and is generally directed to the lower end of the passage opening,
The member that opens and blocks the cut grass transport passage is a plug member that puts in and out of the cut grass transport passage,
The plug member protrudes into the scroll portion from the passage opening of the cut grass transport passage when the cut grass transport passage is blocked by being inserted into the cut grass transport passage, and the protruding tip is a trailing edge in the guide direction. The lawn mower is extended to the vicinity of the rear edge in the guide direction so as to face the rear edge, and the lower end of the plug member is set at substantially the same height as the rear edge in the guide direction.

Images