JPH1033039A - Floating mower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable to simply operate a floating mower which carries out a mowing work by floating a cutting part with air pressure. SOLUTION: This floating mower consists of a mower deck 5 covering upper part of a cutting blade 40 and having a formed opening 6 for air flow, a gear case 20 capable of driving the cutting blade mounted on the mower deck and an engine E which locates at the middle between a handle and the mower deck and connects the gear case 20 and a connecting pipe 12. The gear case 20 is divided into a gear case 21 on a side of a drive shaft which transfers a power from the engine E and a gear case 26 on a side of drive shaft which drives a cutting blade. Both gear cases are rotatably connected with perpendicular shaft centers in front and back directions of the machine body. A baffle plate having a shape of a cup turned downward and capable of unitedly rotating with the cutting blade is installed between the cutting blade and the lower side of the mower deck and plural eccentric fans 43 are installed on the baffle plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating mower for mowing by mowing a mowing part by wind pressure.

[0002]

2. Description of the Related Art Conventionally, a cutting blade is provided at a front end of a connecting pipe having a transmission shaft therein, and an engine is provided at a rear end. An operating handle attached to the connecting pipe while an operator suspends the body from a shoulder by a belt is used by an operator. 2. Description of the Related Art A portable type brush cutter is used which performs a mowing operation by gripping and swinging a cutting blade left and right.
Also, there is known a brush cutter having the above-mentioned structure in which wheels are provided to reduce the load on the worker during long hours of work (Japanese Utility Model Application Laid-Open No. 59-124424, Japanese Patent Application Laid-Open No. H08-112018). . Furthermore, while maintaining the operability and portability of the portable type brush cutter, it is possible to easily perform a fixed-length mowing operation, which is difficult with the use of the portable type brush cutter, and to leave an orderly after-cut. At the same time, in order to reduce the operation load of the operator, air is sucked from the upper part or the side of the mower deck that covers the upper part of the mowing blade by a fan that rotates integrally with the mowing blade, and the air pressure is generated inside the mower deck to generate ground pressure. Floating mowers that carry out mowing work while maintaining a certain height while maintaining the height of the aircraft are known (Japanese Patent Publication No. 1-15242, Japanese Utility Model Publication No. 61-18656, Japanese Utility Model Application Laid-Open No. 58-58). 11
No. 5925, Japanese Utility Model Application Laid-Open No. Sho 58-115926, Japanese Utility Model Application Laid-Open No. Sho 59-182122, Japanese Utility Model Application Laid-Open No. 63-1812.
No. 16, JP-A-63-181218).

[0003]

[Problems to be Solved by the Invention]
JP, JP-A-58-115925, JP-A-58-115925
In the floating mowers disclosed in JP-A-115926, JP-A-59-182122 and JP-A-63-181218, an engine for driving a cutting blade and a fan is directly mounted on an upper portion of a mower deck. The engine is in contact with the obstacle when cutting grass under the obstacle, such as a fence or a plant, so that the grass cannot be cut deep. Further, since the weight of the engine is applied to the deck portion and the center of gravity of the entire work machine is shifted to the front portion, the floating efficiency of the reaping portion is deteriorated, and it is difficult to perform the swinging operation in the left-right and front-back directions. Furthermore, since the air intake port is provided near the engine, the air intake efficiency is low, and the cut grass, soil, and the like tend to clog the air cleaner of the engine.

In the floating type brush cutter disclosed in Japanese Utility Model Publication No. 61-18656 and Japanese Utility Model Application Laid-Open No. 63-181216, the engine is provided at the rear end of the connecting pipe. Similar to the portable type brush cutter, the weight of the fuselage hangs on the shoulder of the worker, and the engine interferes with the worker's body, causing the fuselage to swing back and forth, making it difficult to perform the mowing work. . Furthermore, these floating mowers have the advantage that a uniform mowing state can be obtained by floating the mowing part by wind pressure, but the mowing part side is more versatile than the handle side gripped by the operator. Because of the fixed connection, the vertical position of the handle fluctuates due to a change in the inclination of the reaping surface, and there is a problem that the reaping operation cannot be performed in a fixed posture.

[0005]

The present invention uses the following means in order to solve the above problems. That is, a mower portion is constituted by a cutting blade, a centrifugal fan provided integrally with the cutting blade, and a mower deck covering the cutting blade and the centrifugal fan, a handle is connected to the mower portion, and the mower portion is separated from the mower portion. An engine is provided at a position, a gear case is arranged between the mower portion and the engine, and the gear case is composed of a transmission shaft side gear case connected to the engine and a drive shaft side gear case supporting the drive shaft of the cutting blade. The two gear cases are rotatably connected to each other with the left-right axis of the fuselage. Further, a main handle extends rearward from the engine, and a sub-handle is projected in one direction substantially orthogonal to the main handle, and the sub-handle is attached to the main handle so as to be freely swung left and right. In addition, a downward bowl-shaped air guide plate that rotates integrally with the cutting blade is provided between the cutting blade that is fastened and fixed to the drive shaft and the lower surface of the mower deck, and a plurality of centrifugal fans are provided on the upper surface of this air guide plate. It is a thing.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The problem to be solved by the present invention and the means for solving it are as described above. Next, the configuration of the embodiment shown in the attached drawings will be described. 1 is an overall side view of a floating mower, FIG. 2 is an overall plan view of a floating mower,
FIG. 3 is a partial front view showing a mower portion fixed to a lower portion of the gear case, FIG. 4 is a partial front cross-sectional view of the gear case, FIG. 5 is a side cross-sectional view showing an internal configuration of the mower portion, and FIG. It is a side view which shows the floating type mower in the case of having done.

1 and 2, the entire structure of the floating mower will be described. In the floating mower A, a mower portion M for mowing grass is disposed at a front portion, and a power transmission portion D for transmitting power into the mower portion M is disposed above and behind the mower portion M. The main handle 1 protrudes rearward. The mower part M
Is surrounded by a mower deck 5, air is introduced from a wind guide port 6 opened at an upper part of the mower deck 5 to increase the pressure inside the mower deck 5, and the mower portion M is floated by blowing air from below the mower deck 5. This allows the grass to be cut while moving back and forth and left and right.

The main handle 1 is formed in a substantially "H" shape when viewed from the side, a grip 2 is formed at an upper end, and a side handle 3 is disposed at an upper middle part of the main handle 1. A grip 4 is formed at an end of the side handle 3, and the side handle 3 extends in a direction perpendicular to the main handle 1 and is fixed to a fixed portion 10. The fixing portion 10 is tightened with a U-shaped bolt or the like, and is loosened so that the side handle 3 is rotated by 180 ° around the main handle 1 as shown by a broken line 3 'in FIG. , So that you can work on the opposite side.

Next, the power transmission section D includes an engine E, a clutch case 11, a connecting pipe 12, and a gear case 20.
It is composed of Connecting pipe 12 and gear case 20
The engine E is disposed at a position away from the mower portion M by the rear, and the clutch case 11 has a built-in centrifugal clutch therein and transmits power to a transmission shaft 13 disposed inside the connecting pipe 12. I have. A gear case 20 is arranged below the connecting pipe 12, and power is transmitted to the mower portion M via the gear case 20. A handle holder 14 is provided at a lower portion of the connection pipe 12.
Is fixed to the lower end of the main handle 1.
Further, an inlet hose 15 for introducing air into the cab of the engine E extends along the main handle 1 and an end thereof extends to a position near the side handle 3, and an air cleaner 16 is provided at an end of the inlet hose 15. The mowing grass sucks air with little dust at a position away from the mower portion M so that the air cleaner 16 is not clogged.

Next, the gear case 20 will be described with reference to FIG.
This will be described with reference to FIG. The gear case 20 is divided into a transmission shaft side gear case 21 and a drive shaft side gear case 26, and as shown in the front view of FIG. The stay 9.9 is projected, and a gear case 20 is pivotally supported on the upper end of the stay 9.9. That is, the transmission shaft-side gear case 21 supports the transmission shaft 13, forms a gear chamber 22 at the lower end of the transmission shaft-side gear case 21, and has a left and right axial center shaft on the left side of the lower end. 23, and the end of the pivot pipe 23 is rotatably fitted to the side surface of the stay 9. The right side of the gear chamber 22 is opened, and an annular engagement groove 24 is formed on the right side of the gear chamber 22 in a side view.

On the other hand, the drive shaft side gear case 26 pivotally supports the drive shaft 31 in a direction perpendicular to the mower deck 5, and forms a gear chamber 27 above the drive shaft side gear case 26.
A fitting pipe 2 having a shaft center in the left-right direction on the right side of the gear chamber 27.
8 are formed. The left side of the gear chamber 27 is in an open state, and the left end surface forms an annular engaging body 29 that fits into the engaging groove 24 formed in the transmission shaft side gear case 21. In addition, a fixing portion 32 for mounting and fixing on a central upper surface of the mower deck 5 is formed below the drive shaft side gear case 26. Furthermore, the fitting pipe 2 of the drive shaft side gear case 26
8 is fixed to the stay 9.

As described above, the engaging body 29 of the drive shaft side gear case 26 is engaged with the engaging groove 24 of the transmission shaft side gear case 21, and the connecting shaft 30 is inserted into the pivot pipe 23 and the fitting pipe 28. Then, the end of the connecting shaft 30 is projected to the side of the other stay 9 and screwed together with a nut 37 via a washer 36 so that the mower portion M is rotatable about the connecting shaft 30. . An intermediate transmission gear 33 is pivotally supported on the connection shaft 30 in the gear chamber via a bearing, and left and right bevel gears 34 and 35 are formed at left and right ends of the intermediate transmission gear 33.
The left bevel gear 34 meshes with a bevel gear 38 formed at the lower end of the transmission shaft 13, and the right bevel gear 35 is
1 is engaged with a bevel gear 39 formed at the upper end.
Therefore, when the transmission shaft-side gear case 21 is rotated about the connection shaft 30, the bevel gear 38 of the drive shaft 31 rotates while meshing on the left bevel gear 34.
1 can be transmitted without interruption.

Next, the mower portion M will be described with reference to FIG. The mower portion M is provided with the drive shaft side gear case 26.
The mower deck 5 is fitted and fixed on an outer peripheral surface of the mower deck 5, and a cutting blade 40 and a wind guide plate 41 for guiding air for floating the main body are arranged inside the mower deck 5. The cutting blade 40 and the air guide plate 41 are fixed to the drive shaft 31 pivotally supported vertically below the drive shaft side gear case 26. That is, the air guide plate 41 is formed in a bowl shape, a boss portion 42 is formed at the center of the lower surface, and the boss portion 42 is fitted and fixed to the lower portion of the drive shaft 31. A spacer 45.4 is attached to the lower end of the boss portion 42.
The cutting blade 40 is screwed and fixed to the lower surface of the cutting blade 40 by a tightening bolt 46 via the lower surface 5 so that the cutting blade 40 and the air guide plate 41 are integrally rotated. Further, the mower deck 5
It is formed in a bowl shape slightly larger than the baffle plate 41, the lower end portion of the mower deck 5 extends below the cutting blade 40 to form a contact surface 7 that contacts the ground, and is outside the corresponding contact surface 7. An edge 8 is formed above. Further, a ventilation port 6 is opened at the center of the mower deck 5, and the drive shaft side gear case 2 is opened.
6 and the mower deck 5 are connected and fixed by mounting stays 49.

A plurality of centrifugal fans 43 project from the upper surface of the air guide plate 41. The centrifugal fans 43, 43...
., Rotate the centrifugal fans 43, 43... Together with the rotation of the baffle plate 41 to suck air into the mower deck 5 from the baffle holes 6, and the air guide plate 41 and the lower surface of the mower deck 5 A downward flow x is generated as shown by an arrow in FIG. 6 to float the mower portion M, and a part of the downward flow x is blown into the lower inner surface of the baffle plate 41 as a swirl flow y. The grass is raised.

When the engine E is driven with the above configuration, the rotation is transmitted to the transmission shaft 13 via the centrifugal clutch in the clutch case 11 and transmitted from the intermediate transmission gear 33 to the drive shaft 31. The rotation of the drive shaft 31 causes the cutting blade 40 and the air guide plate 41 to rotate integrally, and the air guide plate 41
By the rotation of the centrifugal fans 43 formed on the upper surface, air is sucked from the air guide port 6 on the upper surface of the mower deck 5,
The inhaled air passes between the inner surface of the mower deck 5 and the baffle plate 41 and blows downward, and a part of this wind flows toward the lower surface of the baffle plate 41 while the grass rises. The mower deck 5 is evenly floated by increasing the internal pressure, and the cutting blade 40 cuts the grass to a certain length. In addition, since the power transmission unit D such as the engine E is located behind the mower M above the mower M, the grass vegetated in the space below the fence or under the planting by the mower M is used. The mowing operation can be performed while moving M in the front-rear direction and moving laterally. Further, when the mower portion M is operated on an inclined surface as shown in FIG. 6, the middle portion of the gear case 20 is rotatable by the drive shaft side gear case 26 and the transmission shaft side gear case 21, and the mower portion M is floated in parallel with the inclined surface (cutting surface), and the mowing work is performed on the inclined surface without the operator operating the main handle 1 to operate the mower portion M in parallel with the inclined surface. Can be performed uniformly.

[0016]

According to the present invention having the above-described structure, the following effects can be obtained. That is, since the engine is installed at a distance from the mower deck, there is a space margin on the mower deck, so that the suction resistance for taking in air for floating the mower portion is provided. As a result, the efficiency of air suction by the centrifugal fan increases. Further, since the engine is arranged at a position higher than the cutting surface on which foreign substances such as grass and dust are cut off, foreign substances in the air supplied to the air cleaner are reduced. Furthermore, the mower deck can be inserted into the fence or the lower space of the plant, and the mower can be cut deep, so that the mower deck is suitable for cutting various places.

Further, since the mower deck is connected to the handle side so as to be freely rotatable on the gear case side, the mower deck and the cutting surface are formed by wind pressure blown downward from the mower deck. It is automatically adjusted to the parallel state, so that a uniform cutting state can be obtained regardless of the inclination of the cutting surface or the physique of the operator, and the operator can work in a reasonable posture. Also,
The mower deck was swung right and left because the rotation axis of the gear case was connected in a state perpendicular to the longitudinal direction of the body, that is, the mower deck was swung only in the longitudinal direction with respect to the handle side. In this case, the mower deck does not rotate carelessly due to the recoil, and the left and right reciprocating mowing can be stably performed.

According to a third aspect of the present invention, the sub-handle extends substantially perpendicularly to the main handle in one direction, and the sub-handle is attached to the main handle so that the sub-handle can be moved to either the left or right. In addition, the position of the worker is regulated by the sub handle, so that the worker's foot can be prevented from hitting the cutting blade of the mower deck. In addition, by switching the sub-handle, it is possible to easily cope with both right-handed and left-handed people. Furthermore, since there is no protruding portion on one side of the main handle, mowing at the time of a fence or a wall can be easily performed, so that operability can be improved.

Further, since the wind guide plate in which the centrifugal fan is integrally formed is formed in a downward bowl shape, the grass rises due to the wind flowing into the wind guide plate. There is no uncut portion, and the cutting surface can be finished evenly. In addition, since the lower surface of the baffle plate receives the wind pressure, the floating force of the mower deck increases, so that the worker can work while holding the main handle and the sub handle lightly, reducing the burden on the worker for a long time. It is also possible to work over a wide area.

[Brief description of the drawings]

FIG. 1 is an overall side view of a floating mower.

FIG. 2 is an overall plan view of a floating mower.

FIG. 3 is a partial front view showing a mower fixed to a lower part of a gear case.

FIG. 4 is a partial front sectional view of a gear case.

FIG. 5 is a side sectional view showing an internal configuration of the mower portion.

FIG. 6 is a side view showing a floating mower when used on an inclined surface.

[Explanation of symbols]

 Reference Signs List A floating mower E engine 1 main handle 3 sub handle 5 mower deck 6 air guide port 12 connecting pipe 13 transmission shaft 20 gear case 21 transmission shaft side gear case 26 drive shaft side gear case 31 drive shaft 40 cutting blade 41 wind guide plate 43 centrifugal fan

Claims (4)

[Claims] A mower portion comprising a mowing blade, a centrifugal fan integrally provided with the mowing blade, and a mower deck covering the mowing blade and the centrifugal fan; a handle connected to the mower portion; A floating mower characterized by an engine located farther away. 2. A gear case is disposed between the mower portion and the engine, and the gear case includes a transmission shaft side gear case connected to the engine, and a drive shaft side gear case supporting a drive shaft of the cutting blade. 2. The floating mower according to claim 1, wherein the two gear cases are rotatably connected to each other with a left-right axis of the body. 3. A main handle extends rearward from the engine, and a sub-handle projects in a direction substantially orthogonal to the main handle, and the sub-handle is attached to the main handle so as to be freely swung left and right. 1. The floating mower according to 1. 4. A downwardly-shaped bowl-shaped air guide plate rotating integrally with the cutting blade is provided between the cutting blade fastened and fixed to the drive shaft and the lower surface of the mower deck. The floating mower according to claim 1, further comprising a fan.