JP2001204220A - Portable mowing machine for levee - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable mowing machine relatively light, having a simple mechanism, capable of safely and easily mowing weeds growing at the face of slopes of high levees and effectively decreasing the works which are borne on labors in mowing at the high levees. SOLUTION: The mowing parts 5 and 6 of this mowing machine provided with motors 31 and 32 mounted and held on shield covers 11 and 12 connected with a operating rod 50, landing elements 21 and 22 slidable on the ground on the shield cover 11 and 12, is provided with wheels 70 and 70' capable of rolling on the ground (M and N) and disposing a spiral spring 90 wherein the spring 90 stores energy by normal rotation of the wheels 70 and 70' in advancing the mowing element 5 and 6 and energizes the wheels 70 and 70' to reversely rotate by the stored energy in retreating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relatively small and lightweight portable shore mower, which can be easily moved by hand by an operator, and more particularly to grass growing on a slope on a high shore. Suitable for cutting grass.

[0002]

2. Description of the Related Art Conventionally, as a shore mower, for example, as can be seen in Japanese Patent Publication No. 62-61290, a body with wheels on which a motor is mounted and an upper surface (flat surface) of the shore
A main cutting blade for cutting grass growing on the hill, and a side cutting blade for cutting grass growing on the slope (slope) of the shore. The power of the prime mover is reduced by a reduction gear or a transmission shaft. The main body and the side blades are transmitted to the main and side cutting blades through a power transmission mechanism, and are simultaneously driven to rotate, while the aircraft is running on the upper side of the shore. It is common to cut the grass at the same time.

[0003] In such a conventional general shore mower, it is assumed that the machine body runs on the upper surface of the shore, and the cutting width of the slope by the side cutting blade is determined by the rotation of the side cutting blade. Since it depends only on the diameter, it can handle normal shores (low shores), but on high lands with large steps, the vertical width of the slope is large and the cutting width is insufficient. in this case,
Position the main and side cutting blades on the same plane,
If the aircraft is driven along the slope of the high shore, the slope cannot be mowing, but the slope of the high hill is extremely dangerous because the slope is steep and the scaffold is poor.

[0004] In addition, having two cutting blades, having an airframe with wheels mounted with a prime mover,
Since a relatively long and complicated power transmission mechanism is required to transmit the power of the prime mover to both the cutting blades, etc., the apparatus configuration is complicated, the weight is heavy, the apparatus cost is high, and the workability is high. However, the operability was not good, and it was actually impossible to use it for mowing slopes on high shores.

Therefore, the inventors of the present invention first attempted to solve the problems associated with the conventional shore mower as described above.
A cutting blade, a rotating shaft to which the cutting blade is attached and fixed, a prime mover for rotating and driving the rotating shaft, a shield cover covering a part or all of the cutting blade, and an operating rod connected to the shield cover. A portable shore mower having a configuration in which the prime mover is mounted and held on the shield cover and a grounding member capable of sliding on the ground is provided on the shield cover has been proposed. -300630).

[0006] In such a proposed portable shore mower, when mowing a slope on a high shore, an operator usually stands on the upper surface of the high shore with an operation rod, and a mowing blade is driven by a motor. While rotating, the mowing work section including the cutting blade and the shield case is positioned at the uppermost portion of the high shore, and the grounding member is landed on the slope of the high shore. Subsequently, the mowing is performed by the operation rod. When the working part is pressed lightly, the mowing work part (ground contact member) slides from the top to the bottom of the slope. At this time, the grass on the slope is cut in the vertical direction by the width corresponding to the rotation diameter by the rotating blade.

Next, in order to cut off the grass growing next to the portion cut as described above, the mowing work portion is once pulled up to the top of the slope, and then the mowing work portion is moved to the next position. Move to the part where the grass to be cut is growing (next to the side), land the grounding member on the top of the slope on the high side in the same manner as described above, and lightly push the mowing work part with the operating rod, The mowing work section (ground contact member) is slid from the top to the bottom of the slope, and thereafter, grass growing on the slope is similarly moved by a width corresponding to the rotation diameter of the cutting blade in the vertical direction. Try to reap.

[0008] As described above, the use of the above-mentioned portable shore mowing machine only requires the worker to move laterally on the upper surface of the high shore and does not need to descend on the slope. Can be performed safely, easily, and quickly. In addition, since the weight of the entire mowing work section is received on the ground (mowing surface) via the grounding member, the burden on the worker is reduced, and the work is not self-propelled. As a result, the labor required for mowing can be reduced.

[0009]

However, even the portable shore mower proposed above is not yet sufficient from the viewpoint of reducing the labor of the operator. That is, when performing mowing work on a high ridge slope, when moving the mowing work portion (ground contact member) from the top to the bottom of the slope, an operator presses the mowing work portion lightly with an operation rod. Only, since the mowing work section naturally slides down due to the action of gravity, the labor burden on the worker is extremely small, but when the mowing work section is pulled up from the high shore bottom to the top,
There is also the frictional resistance between the ground (slope) and the grounding member, and the root of the grass (remaining uncut portion) may be caught on the grounding member. In addition, the operator is burdened with a large labor.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to safely, easily and quickly mow grass growing on a high slope. It is an object of the present invention to provide a portable shore mower, which is capable of effectively reducing the labor burdened by an operator on mowing work on a high hill slope.

[0011]

In order to achieve the above object, a portable shore mower according to the present invention basically comprises a cutting blade, a motor for driving the cutting blade, and the cutting blade. A shield cover that covers a part or the entirety of the vehicle, and an operating rod connected to the shield cover, wherein the prime mover is mounted and held on the shield cover, and the ground member is slidable on the ground by the shield cover. Is provided.

[0012] A wheel is provided on the mowing work section provided with the shield cover and the grounding member so as to roll on the ground, and a spiral spring is provided on the wheel. When the wheel is moved forward, it is involved so as to store the urging force by the forward rotation of the wheel, and when the mowing work unit is retracted, the wheel is reversely urged by the stored urging force. It is characterized by being.

[0013] In a preferred aspect of the portable shore mower according to the present invention, there is provided a connecting / disconnecting means capable of arbitrarily connecting and disconnecting the transmission of the rotational force between the wheel and the spiral spring. In a specific preferred aspect, a support shaft that supports the wheel is rotatably supported by the mowing work unit, and an outer end of the spiral spring is fixed, and an inner end of the spiral spring is fixed to the support shaft. The portion is fixed, and the wheel is locked so as to be integrally rotatable with respect to the support shaft by a locking member serving as the disconnecting / attaching means detachably mounted on the support shaft.

In another specific preferred embodiment, a support shaft for supporting the wheels is rotatably supported by the mowing section, and an outer end of the spiral spring is fixed to the mowing work portion. The inner end of the spiral spring is fixed, and the wheel is externally fitted to the support shaft via a one-way clutch.

It is preferable to use a wheel with a spike which always catches the ground and does not cause a slip when the mowing work section (ground contact member) slides.
In a more preferred aspect, the left and right pair of sled members
Each of the wheels has the same outer shape.

In a preferred embodiment of the portable shore mower according to the present invention having the above-described configuration, when mowing a slope on a high shore, the mowing machine described in the above-mentioned proposal (Japanese Unexamined Patent Application Publication No. Hei 11 (1999) -197) is used.
As in the case of No. 300630), the operator stands on the upper surface of the high shore with the operation rod, and drives the mowing blade by the motor to move the mowing work section including the mowing blade, the shield case, the grounding member, and the like to the high bank And the landing member is landed on the slope of a high shore, and then the mowing work portion is lightly pressed by the operation rod, whereby the mowing work portion (ground contact member)
, But glides down from the top to the bottom of the slope. At this time, the wheel is rotated (forward rotation), and the spiral spring provided in the mowing section is wound in such a manner that the biasing force is stored by the forward rotation of the wheel, and the grass on the slope is removed by the cutting blade. The cutting width is cut in the vertical direction.

Next, in order to cut the grass growing next to the portion cut as described above, the mowing work portion is once pulled up to the uppermost portion of the slope so as to slide on the slope (retreat). . At this time, the wheel is urged in the reverse direction (reverse direction) by the spiral spring that is entrained by the forward rotation of the wheel during the gliding descent and stores the urging force.

For this reason, when the mowing work section is raised, the urging force of the spiral spring acts as a lifting assisting force, and it is not necessary to raise the mowing work section as in the case of the proposed prior art. Just pulling the mowing work section lightly with the operating rod, the reversal of the wheels causes the mowing working section to be pushed up in the direction of ascending the slope,
As a result, the labor burden of the worker can be reduced.

Subsequently, the mowing work section is moved to a portion where the grass to be harvested next is growing (next to the side), and the grounding member is landed on the top of the high slope, in the same manner as described above. ,
Lightly pushing the mowing work portion with the operating rod, the mowing work portion (ground contact member) is slid from the top to the bottom of the slope, and thereafter, similarly, grass growing on the slope is The cutting blade is cut in the vertical direction by the cutting width of the cutting blade.

As described above, if the portable shore mower of the present invention is used, the worker need only move laterally on the upper surface of the high shore, and does not need to descend on the slope. Can be done safely, easily and quickly
At the time of raising the mowing work section, the urging force of the spiral spring acts as an auxiliary lifting force, so that the labor burdened by the operator during mowing work on a high hill slope can be effectively reduced.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a perspective view and a plan view, respectively, of a first embodiment of a portable shore mower according to the present invention. The portable shore mower 1 of the illustrated embodiment includes a strip-shaped cutting blade 10, a rotating shaft 45 (FIG. 3) to which the cutting blade 10 is attached and fixed, and the cutting blade 10 is connected via the rotating shaft 45. A relatively small and lightweight (displacement is about 20 mL) air-cooled two-cycle gasoline engine 31 as a prime mover that rotates and drives, a shield cover 11 that covers the cutting blade 10 and is rectangular in plan view, and is connected to the shield cover 11. And a pair of sled-shaped ground members 21 and 21 slidable on the ground are provided on both left and right sides of the shield cover 11 so as to slightly protrude in the front-rear direction. I have.

Referring to FIG. 3 in addition to FIG. 1, the shield cover 11 has a front end 1 on the front side F.
1a is tilted obliquely upward to open a relatively large opening, and a flap 14 is provided below the front end 11a so as to close this opening (front opening).
The rear end portion 11b is provided so as to be swingable in the front-rear direction through the rear end 8 and closes the rear opening about half of the rear opening from above.

The engine 31 has bolts and nuts 42, 42,
Are held and fixed via a roughly funnel-shaped outer case member 37 fixed by. The power of the prime mover 31 is transmitted to the rotary shaft 45 from an output member 40 including a crankshaft, a flywheel with a cooling fan (not shown), a centrifugal clutch drum 41 and the like.

The rotating shaft 45 is connected to the outer case member 3.
7, a bearing 4 is provided on a cylindrical support portion 38 integrally formed therein.
It is rotatably supported via 6, 48 while being prevented from moving in the axial direction. At the lower end of the rotating shaft 45, the cutting blade 10 is disposed so as to be sandwiched between an upper pressing member 61 and a lower pressing member 62, and the upper pressing member 61, the cutting blade 10, and The lower holding member 62
Are fixed to the rotating shaft 45 together with a nut 63 screwed to the lower end thereof so as to be integrally rotatable.

As can be seen from FIG. 6 in addition to FIGS. 1 and 2, the operating rod 50 is provided on both left and right sides of the shield cover 11 (the pair of left and right grounding members 2).
1, 21) A fork-shaped front part 53 whose center portion 53a is rotatably supported by support pins 55, 55 protruding from the center, and extrapolated to a common base of the forked front part 53. It has a middle section 52 made of a possible tube material and a rear section 51 made of a tube material that can be extrapolated to the middle section 52, and the entire length can be arbitrarily expanded and contracted by means known per se, With the support pins 55 as fulcrums, they can swing vertically.

The tip 53 of the operating rod 50
A tension coil springs 57 are stretched between a, 53a and locking pins 56, 56 protruding from a front side F of the ground members 21, 21, respectively.
Is always urged by the tension coil springs 57, 57 in the direction of rotating the rear portion 51, which is the handle portion, downward (clockwise) as viewed from the left side surface (see FIG. 3).

In the present embodiment, the ground members 21 are rolled near the front ends of the ground members 21, 21 formed of the pair of left and right sleds when the ground members 21 are slid on the ground, respectively. Thus, wheels 70, 70 having the same outer shape are provided.

4 and 5, the wheel 70 has a disk 71 with a boss member 73 fixed at the center by welding or the like, and a wheel 71 fixed to the outer periphery of the disk 71 by welding or the like. And a pair of star-shaped plates opposing each other with a phase shift of a half pitch between the inner and outer spike portions 72. Department.

The wheel 70 is attached to the mounting portion 23 provided near the front end of the grounding member 21 by one of the flange portions 2.
A connecting tubular member 25 to which 5b is attached and fixed by bolts 24, 24, ..., a supporting member 26 attached and fixed to the other flange 25a of the connecting tubular member 25 by bolts 27, 27, ... The support member 26 is externally fitted to the support shaft 20 rotatably supported via a ball bearing 35 housed in a housing portion 26a provided at the center of the support member 26.

More specifically, the support shaft 20 is provided with a base-side small-diameter portion 20a on which the ball bearing 35 is externally fitted and a spiral spring 90 described later in order from the ground member 21 side (inside). A central large-diameter portion 20c, a free-end-side small-diameter portion 20b on which the boss member 73 of the wheel 70 is fitted. The nut 36 for preventing the ball bearing 35 from slipping off at both ends. Wheel 7
A bolt 37 with a flange for retaining 0 is screwed together.

A locking pin 80 is detachably mounted so as to penetrate the boss member 73 of the wheel 70 and the small-diameter portion 20b on the free end side of the support shaft 20 in the radial direction. A spring pin 81 for retaining is inserted in the insertion protruding end of the locking pin 80 in the radial direction. By attaching the locking pin 80, the wheel 70 is rotated integrally with the support shaft 20, and when the locking pin 80 is pulled out, the wheel 70 is free and can rotate freely. Becomes

The spiral spring 90 externally mounted on the central large-diameter portion 20c of the support shaft 20 comprises the support member 26,
A spring defined by a short cylindrical portion 26b protruding from the support portion 26 on the opposite side to the storage portion 26a and a disk 74 fixed to the outer end surface of the central large-diameter portion 20c by welding or the like. It is adapted to expand and contract in the chamber 77.

That is, the annular outer end portion 91 of the spiral spring 90 is externally fitted to a pin 93 fixed by welding or the like to a portion of the support member 26 located at the outer peripheral end of the spring chamber 77. The annular inner end 92 of the spiral spring 90 is connected to the spring chamber 7 of the disk 74.
7 is externally fitted and locked to a pin 94 inserted into a locking groove 20d formed in the central large-diameter portion 20c of the support shaft 20 through a portion located at an inner peripheral end of the shaft 7.

Accordingly, when the mowing work section 5 composed of the cutter 10, the shield cover 11, the grounding member 21 and the like is advanced (the wheel 70 is moved to the left side in FIG. 3) When the wheel 70 is rotated counterclockwise), the wheel 70 is rotated so as to store the biasing force (forward rotation), and when the mowing unit 5 is retracted, the stored biasing force is stored. Thus, the wheel 70 is urged in a reverse direction.

In the portable shore mower 1 of the first embodiment having such a configuration, when mowing the slope N on the high shore, it can be generally understood by referring to FIG. Meanwhile, while the operator stands on the upper surface M of the high shore with the operation rod 50 and rotates the cutting blade 10 by the engine 31, the cutting blade 10, the shield cover 11, the grounding member 21, The mowing work unit 5 including the upper part 21 and the like is positioned at the uppermost part of the slope N on the high shore, and the grounding members 21 and 21 are landed on the slope N on the high shore. If the mowing part 5 is pressed lightly, the mowing part 5 (the ground contact member 21) slides down from the top to the bottom of the slope N by its own weight. At this time, the wheel 7
0 is rotated (forward rotation), and the spiral spring 90 provided in the mowing section 5
The grass on the slope N is cut in the vertical direction by a cutting width corresponding to the rotation diameter by the cutting blade 10 being driven to rotate so as to store the urging force and being driven to rotate.

Next, in order to cut the grass growing next to the portion cut as described above, the operation rod 50 is cut.
, So that the mowing work section 5 slides on the slope N, and is once pulled up to the top of the slope N (retreat). At this time, the wheel 70 is retracted by the forward rotation of the wheel 70 at the time of the sliding descent and stores the biasing force, whereby the wheel 70 is rotated in the reverse direction (reverse direction).
It is urged to.

For this reason, when the mowing work section 5 is raised, the urging force of the spiral spring 90 acts as a lifting assisting force, and it is necessary to lift the mowing work section 5 as in the previously proposed one. Not,
Just pull the mowing part 5 lightly with the operation stick 50,
The reversal of the wheel 70 pushes the mowing work section 5 upward in the direction of ascending the slope N, and as a result, the labor burden on the operator can be reduced.

Subsequently, the mowing work section 5 is moved to a portion where the grass to be mowing next is growing (adjacent to the side), and the grounding members 21, 21 are similarly moved to the slope N on the high side. Then, the mowing work section 5 is lightly pushed by the operating rod 50 so that the mowing work section 5 (the ground contact members 21, 21).
Is slid from the top to the bottom of the slope N, and similarly, the grass growing on the slope N is cut in the vertical direction by a width corresponding to the rotation diameter of the cutting blade 10. I do.

As described above, if the portable shore mower 1 of the present embodiment is used, the worker only needs to move the upper surface M of the high shore only in the lateral direction, and does not need to descend on the slope N. So
Safe and easy mowing work on high hill slope N
This can be performed quickly, and when the mowing work section 5 is pulled up, the urging force of the spiral spring 90 acts as a lifting assisting force, so that the labor burdened by the operator during the mowing work on the high hill slope N can be effectively reduced. In addition, since the weight of the entire mowing work section 5 is received on the ground (mowing surface) via the grounding members 21 and 21, the burden on the operator is reduced, and the mowing is not a self-propelled type. The work can be arbitrarily rested as required, and as a result, the labor required for mowing can be reduced.

When the length L of the slope N is equal to or longer than the length of the spiral spring 90 completely wound or unwound, or when mowing the upper surface M of the high shore, or It is better not to transmit the rotational force between the wheel 70 and the spiral spring 90 when the portable shore mower 1 is carried or transferred (the wheel 70 becomes a resistance). The wheel 70 can be freely rotated by pulling out the locking pin 80 serving as a connecting / disconnecting means capable of arbitrarily connecting / disconnecting the transmission of the rotational force between the spiral spring 90 and the spiral spring 90.

FIGS. 7 and 8 show a perspective view and a plan view of the portable shore mower 2 of the second embodiment. The portable shore mower 2 of this embodiment will be described first. The same reference numerals are given to portions having the same functions or corresponding portions as the respective portions of the portable shore mower 1 of the first embodiment described above, overlapping description will be omitted, and differences will be mainly described. .

A portable shore mower 2 according to a second embodiment shown in the figure.
Is equipped with a relatively small and lightweight (displacement of about 20 mL) air-cooled two-cycle gasoline engine 32 and a shield cover 12 that covers the cutting blade 10 and has a rectangular shape in a plan view. And a pair of sled-like members, which are slidable, are provided so as to slightly protrude in the front-rear direction.

8 and 9, in addition to FIG. 7, the front end 12a of the front side F has a semicircular shape in plan view, and the entire front surface of the shield cover 12 is open. The rear end portion 12b located on the rear side R is
The rear opening is closed about halfway from the top.

In the engine 32, a rotary shaft 45 is held and fixed to the fixed support 29 in a state where the rotary shaft 45 is inclined to the front side F with respect to the vertical line near the front of the shield cover 12, and projects downward. Bearings 46 and 48 are provided on the support portion 19 and the external insertion member 39 which also serves as a gear case projecting upward.
The cutting blade 10 is tilted slightly forward with respect to the ground (upper surface M and slope N) on the inclined axis Op.

In this embodiment, the engine 3
The terminal portion of the second output member (centrifugal clutch drum) 40
A final output shaft 40c provided with an output bevel gear 91;
The output bevel gear 91 is meshed with an input bevel gear 92 provided at an upper end portion of the rotating shaft 45, and moves the engine 3 with respect to the inclined axis Op of the rotating shaft 45.
2, and the rotation axis Oq of the final output shaft 40c is inclined rearward.

By tilting the cutting blade 10 forward as described above, falling grass and the like can be cut easily. Also,
By tilting the rotation axis Oq of the final output shaft 40c backward, it is possible to effectively suppress the tendency of the body 2 to fall to the front side F on the slope N.

In the present embodiment, as can be clearly understood with reference to FIG.
b and the boss member 73 of the wheel 70 ', a bearing 100 and a one-way clutch 110 are interposed. The spiral spring 90 is used when the mowing work unit 6 is advanced (the slope N At the time of the sliding descent), the wheels 7
When the mowing work unit 6 is retracted through the one-way clutch 110 so as to store an urging force by the forward rotation of 0 ', and is retracted (when the slope N is pulled up).
Then, the wheel 70 ′ is urged in the direction of reverse rotation via the one-way clutch 110 by the accumulated urging force. Further, after the spiral spring 90 is completely wound, the wheel 70 is allowed to freely rotate in the forward direction, so that the length L of the slope N is larger than the setting of the spiral spring 90. No problem when moving.

By doing so, substantially the same operation and effect as those of the first embodiment can be obtained, and at the same time, the portable shore mower 2 can be conveniently transported and moved. As mentioned above, although the embodiment of the present invention was described in detail, the present invention
The present invention is not limited to the above embodiment, and various changes can be made in the design without departing from the spirit of the invention described in the claims. For example, the spiral spring may be provided only on one axle, or may be provided on both sides, and then the left and right axles may be interlocked.

[0049]

As will be understood from the above description, according to the present invention, in mowing work on a high shore, an operator only has to move the upper surface of the high shore sideways, and Since there is no need to descend, mowing work on high hill slopes can be done safely and easily and quickly, and when raising the mowing work part, the urging force of the spiral spring acts as an auxiliary lifting force. The labor for mowing can be effectively reduced.

Further, since the weight of the entire mowing work section is received on the ground (mowing surface) via the grounding member, the burden on the operator is reduced, and the work is not necessary because it is not a self-propelled type. Can be arbitrarily rested according to the above, and as a result, labor required for mowing can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a mowing work section of a portable shore mower according to a first embodiment of the present invention, as viewed from the left rear.

FIG. 2 is a plan view of a main part of the mowing work section shown in FIG. 1;

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2;

FIG. 5 is a sectional view taken along the line VV of FIG. 4;

FIG. 6 is a diagram which is used to explain a state of cutting grass on a slope on a high shore using the portable shore mower shown in FIG. 1;

FIG. 7 is a perspective view from the left rear side showing a mowing work section of the portable shore mower according to the second embodiment of the present invention.

FIG. 8 is a plan view of a main part of the mowing work section shown in FIG. 7;

FIG. 9 is a sectional view taken along the line IX-IX in FIG. 8;

FIG. 10 is a sectional view taken along the line XX of FIG. 8;

[Explanation of symbols]

1, 2 Portable shore mower 5, 6 Mowing work section 10 Cutting blade 11, 12 Shield cover 20 Support shaft 21, 22 Grounding member 31, 32 Air-cooled 2-cycle gasoline engine (motor) 50 Operating rod 70, 70 'wheel 72 Spike 90 Spiral spring 80 Locking pin (disconnecting means) 91 Outer end 92 Inner end 110 One-way clutch (disconnecting means) M Ground (upper surface on high side) N Ground (slope on high side)

Claims (7)

[Claims] 1. A cutting blade (10), a prime mover (31, 32) for driving the cutting blade (10), and a shield cover (11, 12) covering a part or all of the cutting blade (10). Operating rod (5) connected to the shield cover (11, 12).
0), and the prime mover (31, 32) is mounted and held on the shield cover (11, 12), and the shield cover (11, 12) can slide on the ground. 22) A portable shore mower (1, 2) provided with a mowing work unit (5, 6) including the shield cover (11, 12) and the grounding member (21, 22). Wheels (70, 70 ') are provided so as to be able to roll (M, N), and a spiral spring (90) is provided on the wheels (70, 70'), and the spiral spring (90) When the working unit (5, 6) is moved forward, the wheels (70, 70 ') are caught so as to store the urging force by the forward rotation, and when the mowing work unit (5, 6) is moved backward, The wheel is operated by the stored biasing force. (70, 70 ') is urged | biased in the direction which reverses, The portable shore mowing machine characterized by the above-mentioned. 2. A connecting / disconnecting means (80, 110) for arbitrarily connecting / disconnecting the transmission of rotational force between the wheel (70, 70 ') and the spiral spring (90). The portable shore mower according to claim 1. 3. A support shaft (20) for supporting the wheels (70, 70 ') is rotatably supported by the mowing work portions (5, 6), and an outer end of the spiral spring (90). A portion (91) is fixed, an inner end (92) of the spiral spring (90) is fixed to the support shaft (20), and the wheels (70, 70 ') are fixed to the support shaft (20). Locking member (80) detachably attached to the device as the connection / disconnection means
The portable shore mower according to claim 2, wherein the mower is locked so as to be integrally rotatable with the support shaft (20). 4. A support shaft (20) for supporting the wheels (70, 70 ') is rotatably supported by the mowing work sections (5, 6), and an outer end of the spiral spring (90). A portion (91) is fixed, an inner end (92) of the spiral spring (90) is fixed to the support shaft (20), and the wheels (70, 70 ') are fixed to the support shaft (20). The portable shore mower according to claim 1 or 2, wherein the mower is externally fitted via a one-way clutch (110). 5. The portable shore mower according to claim 1, wherein the wheels (70, 70 ′) are provided with spikes (72). 6. The portable shore mower according to claim 1, wherein the grounding member comprises a pair of left and right sled members (21, 22). 7. A pair of left and right sled members (21, 2).
2) Each of the wheels (70, 70, 7) having the same outer shape.
0 ', 70') are provided.