JPH0322125B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wheeled mower using a circular saw.

Mowing the grass used to be old-fashioned and hard work, but about 10 years ago, shoulder-type mowing machines were introduced on the market, and the work became much easier. A backpack-type mower is designed to carry a small drive unit including an engine, reducer, etc.
The output part rotates the circular saw at the tip of the long rod via a transmission shaft passed through the long rod, and the rod is manually operated to cut the grass, allowing you to freely move the grass while standing. It feels like the heavy labor of old-fashioned mowing work has been revolutionaryly eliminated.

However, in recent years, with the remarkable development of other agricultural machines and most of them being automated, carrying them on your back is extremely tiring, no matter how light the drive unit is, especially since the vibrations can hurt your shoulders and arms. The hard work of mowing grass is extremely tiring and is creating new occupational diseases. In addition, in order to make it easier to mow grass on slopes and depressions, the angle of the rotary axis of the circular saw can be changed freely using a control lever attached to the rod, but the momentary reaction of the circular saw hitting a stone etc. As people became accustomed to handling these popular mowers and felt less dangerous, there were serious accidents such as severed legs caused by the bouncing of the freely tilting circular saw. It is becoming more common.

Therefore, efforts were made to change the machine to one with wheels like other machines, or even to be self-propelled. It is not enough to simply install a lawn mower on a two- or four-wheeled self-propelled vehicle;
On the contrary, it is difficult to work.

For example, as seen in Japanese Utility Model Application No. 58-41135, a circular saw for horizontal mowing that moves left and right and a circular saw for sleeve mowing that moves up and down are driven by a drive device mounted on a four-wheeled vehicle. There are some types that can be used for both purposes, but horizontal cutting and sleeve cutting are specialized.
This makes the device more complex and heavy, which poses problems from both a cost and work standpoint.

In view of the above, the present invention has been developed by equipping one mowing device on a trolley so that it can rotate on three axes, thereby making it possible to perform both surface mowing and sleeve mowing with one mowing device, which is light overall, has good workability, and is inexpensive. For the purpose of providing a lawn mower, a support stand is provided on the cart via a 3-axis rotation device, and a swing stand is provided on this support stand for free rotation. The machine is characterized in that an arm provided with a saw is provided, and the circular saw and the oscillating table are driven in conjunction with an engine, and the engine is mounted on the oscillating table.

For 3-axis rotation, there is no need to actually provide three rotation axes; a so-called universal joint can be used, or a point support can be used to support the whole thing in a Yajirobe style so that it can be handled freely. However, in actual grass mowing work, there are few situations in which slope mowing (usually called sleeve mowing) and horizontal mowing are performed at the same time.For example, when mowing grass on a ridge,
In most cases, it is better to cut the grass on the horizontal surface of the road using horizontal mowing, and then cut the grass on the sides of the ridge using sleeve mowing, which is better in two stages.Three axes rotate simultaneously. Although it is possible, in practice mowing is performed with one or two fixed axes or even three axes fixed, and will be explained below based on the practical aspect.

FIG. 1 shows an embodiment of the present invention in a state for horizontal mowing, and numeral 1 denotes a frame of a trolley that runs on three or four wheels 2;
A three-axis rotation device 3 is provided above. Specifically, as shown in FIGS. 2 to 4, the three-axis rotating device includes a first rotating shaft 5 that is fitted into a shaft tube 4 fixed to a frame 1 and installed upright, for example, on a horizontal surface of the frame 1. A first rotating shaft (hereinafter also referred to as vertical shaft 5) that stands vertically, and a second rotating shaft 6 supported by this vertical shaft 5, for example,
The second axis of rotation (hereinafter referred to as the horizontal axis 6) is horizontal.
) and a third rotating shaft 8 that is perpendicular to this horizontal axis 6 and rotates around this horizontal axis 6,
For example, it consists of a cylindrical rotating shaft (hereinafter also referred to as orthogonal shaft 8) that is part of a rotating body that rotates around a horizontal axis 6 and is mounted on a support 7 that is perpendicular to the horizontal axis 6. .

A support stand 9 is integrally attached to this orthogonal shaft 8,
A swing stand 10 is provided on the support stand 9 so as to be freely rotatable, and an engine 12 is mounted on this swing stand 10. The oscillating table 10 is also provided with an arm 11 having a transmission shaft therein that is connected to an engine 12 and rotates, and a circular saw 40 is attached to the tip of the arm 11 . The coupling relationship between the engine and the transmission shaft passing through the arm 11 is as shown in FIG.
They are connected via one of four bevel gears that mesh with each other, but since this is a well-known mechanism, detailed explanation will be omitted.

A bearing stand 13 is provided upright on the vertical shaft 5, and a horizontal shaft 6 is attached to this bearing stand 13 with bolts 14. One side 15 of a worm gear is attached to the horizontal axis 6 so as to be freely rotatable. 15 can be made non-rotatable. As seen in FIG. 3, the other worm gear 18 is supported by a bearing 17 provided on the vertical shaft 5 or the bearing stand 13, and the handle 19
It can be rotated from both the left and right sides. Gear 1 like this
5 and 18, even if the lever 16 is loosened, the support 7 and the rotating shaft 8 will not freely fall down and rotate.

A support 7 stands up from a part of the gear 15, and the top of the support 7 is a cylinder, into which a third rotating shaft 8 is fitted. Both the orthogonal shaft 8 and the vertical shaft 5 can be made non-rotatable by insertion pins 20 and 21, respectively, so that when they are removed, for example, the orthogonal shaft 8 is prevented from slipping out from the column 7. As shown in Figure 6, the bolt pin 22 is inserted.

The shaft cylinder 4 and the orthogonal shaft 8 are both cylindrical bodies, which have a half-split structure, and by passing a bolt through the bolt hole 50 shown in FIG. 3 and tightening the shaft cylinder and the orthogonal shaft itself, the vertical shaft 5. It may be integrated with the support column 7.

FIG. 7 shows the swinging device of the swinging table 10,
A lever or disc 2 that rotates via the bevel gear integrated in FIG. 5, a clutch 23, and a worm gear 24.
The other end of the lever 26, which is connected to the pin hanging from the lever 5, is fixed to the support base 9 with a bolt 27 planted in the support base 9, and when the bolt 28 is removed,
The swing table 10 and the support table 9 can freely rotate around the rotation center pin 29. Support stand 9 and swing stand 10
The bolt 30 is inserted into the threaded part of the pin 29 from below.
are connected freely to rotate. Bolts 31, 31
is used for assembling the two-ply support stand 9.
The upper part of the bolt 28 slides while being guided by a circular groove 32 (FIG. 5) provided in the oscillating table 10.

Arm 11, bevel gear device, worm gear 2
3 and the engine are integrated into a swing base 10.
If the arm 11 is connected to the output shaft of the engine by a flexible transmission shaft as before, the complete device may be removed from the trolley and used as a backpack-type mower as before.

In order to do so, and also according to the present invention, the circular saw is provided with a first arm 11 that is detachable from the arm 11.
As shown in the figure, two or more types of head bodies 33 with different intersection angles α between the transmission axis a and the rotation axis b of the circular saw, particularly three or four types in the range of 30° to 120°, are prepared. Furthermore, as shown in Figure 8a, b, and c, we prepared a horizontally oriented head body with α=0 in Figure 8b, an upward-oriented head body with α=±120°, and a downward-oriented head body. If you leave it,
As will be explained later, this is extremely convenient. The shaft a and the shaft c in the arm 11 can be easily attached and detached by using a hexagonal fitting, and the arm 11 and the head body 33 are connected using bolts 34. In addition, the fifth
In the figure, 36 is a manual swing handle, 41 is an output pinion for connecting the wheels to the engine via a flexible transmission shaft, and 42 is an output shaft for use in various other operations.

With the above configuration, FIG. 1 shows horizontal mowing. Normally, for horizontal mowing, the vertical shaft 5 and the orthogonal shaft 8 are rendered unrotatable using the pins 20 and 21, the bolt 28 is removed, and the first
As shown in the figure, use the handle 19 from either the left or right to rotate the worm gears 15 and 18, for example, tilt the orthogonal shaft 8 forward α ₁ with respect to the vertical shaft 5, and use the lever 16 to rotate the worm gears 15 and 18. and α
=α Attach the circular saw on the head body 33 of ₁ , and tighten the clutch 23.
Start the engine without turning off the power. If you keep the circular saw close to the ground with α = α ₁ , if the ground is flat and smooth, the rod will swing 90 degrees to the left and right of the straight direction, so gently push the trolley forward. For example, if you move the grass forward, you can continue mowing the grass uniformly over a 2 meter width, for example. If the tooth is damaged, it may be helpful to turn the head upside down and reverse it.
When mowing in a narrow width, the clutch 23 is disengaged and the swing angle is adjusted using the handle 36. For example, when placing a trolley on one ridge of a water ditch and mowing grass on the other ridge, do this.

To change from the state shown in Figure 1 to the state shown in Figure 5,
Rotate the worm gears 15 and 18 with the handle,
Return the orthogonal shaft 8 to the vertical direction, remove the pin 20,
For example, by rotating the support base 9 by 90 degrees, the head body 33
Rotate it 90 degrees so that it is facing you in the direction shown in Figure 1, insert the pin 20 again, and then
Pull out the pin 21, rotate the vertical shaft 5 90 degrees in the opposite direction to the previous one, and turn the worm gears 15 and 18 again.
Turn the horizontal axis 6 by 90°. In this state, the arm 11 is oriented horizontally, but the clutch 2
If you turn the engine without turning off the power, the circular saw will move up and down in the vertical plane.

Note that the above procedure is a step-by-step explanation of the operating procedure, but the brief explanation is as follows. For sleeve cutting, (1) remove the pins 20 and 21, (2) loosen the bolt in the bolt hole 50, (3) hold the handle 36, hold the handle 16, and hold the handle 16 in the diagonally shaded area in Figure 2. Rotate 90 degrees, (4) Reinsert pins 20 and 21, (5) Tighten the bolt in bolt hole 50, (6) Turn worm gear 18, (7) Tighten lever 16, (8) Rotate the engine. let

When mowing on a flat surface, (1) Loosen the handle 16, turn the handle 19 to make it horizontal, (2) Remove the pins 20 and 21, (3) Loosen the bolt in the bolt hole 50, (4) Turn the handle 36 Hold the lever 16 and turn the worm gear 18, (5) reinsert the pins 20 and 21, (6) tighten the bolt in the bolt hole 50, (7) turn the handle 19 so that the circular saw is slightly above the ground. (8) Close lever 16, (9) Start the engine.

Adjust the rotation angle position of the horizontal shaft 6, and rotate the swinging device 2.
By adjusting the working length of 6, it is possible to cut along the slopes of ridges and banks with any desired cutting width. As the drawing does not show the means for connecting the engine to the wheels 2, it is best to push the trolley by hand, but for mowing on flat, wide ground, the wheels may be driven by the engine. . For this purpose, for example, by attaching a gear to the horizontal shaft and connecting this gear to the wheels and the engine, the engine and wheels can be constantly connected regardless of the ups and downs of the support column 7.

By removing the pins 20 and 21, disengaging the clutch 23, and using a handle (not shown) integrally attached to the engine or the oscillating table 10, the circular saw can be tilted and raised freely, and the cart can be moved forward. It can be pushed back.

By attaching the handle to the support stand 9, you can adjust the vertical movement of the circular saw while automatically swinging the saw.
The left and right movement can be adjusted by hand, making it easy to work even when the ground or slope is uneven.

As described above, according to the structure of the present invention, and as explained in detail in the usage method, unlike the backpack type, the weight of the engine etc. is not placed on the shoulder and the body is not subjected to severe vibrations. , and arm 11
It allows you to work as freely as a backpack-type saw that you hold in your hand, which means you can immediately respond to the unevenness of the ground or slope. There are no accidents caused by broken legs and amputation, and being able to work while standing far away from the circular saw prevents accidents.The disadvantage of circular saws not swinging can be overcome by replacing the head body. In reality, there are only a few types of work that require frequent swinging of a circular saw.

From a structural point of view, since the engine is mounted on the oscillating table, the drive system can be configured independently of the rotation of the vertical, horizontal, and orthogonal axes, making the configuration extremely simple. It is possible to achieve cost reductions such as not having to use 1.
The machine's mowing device can be used for both sleeve mowing and horizontal mowing, and in some cases, it can also be used as a conventional backpack-type mower.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a rotation position for plane mowing according to an embodiment of the present invention, FIGS. 2, 3, and 4 are front sectional views showing an embodiment of a three-axis rotation device;
Front view in 90° rotated position, front view in folded position,
FIG. 5 is a front view showing the rotation position for sleeve trimming, FIG. 6 is a front sectional view showing a bolt for preventing the orthogonal shaft from coming off, and FIG. 7 is a front sectional view showing the swinging device. Figures 8a, b, and c are front views showing the head body of the circular saw. DESCRIPTION OF SYMBOLS 1...Vehicle body frame, 2...Wheel, 3...3-axis rotating device, 4...Shaft tube, 5...1st rotating shaft (vertical axis), 6...2nd rotating shaft (horizontal axis) , 8... Third rotation axis (orthogonal axis), 9... Support stand, 10...
Swing stand, 11...rod, 12...engine, 1
5, 18... Worm gear, 20, 21... Pin, 23... Clutch, 24... Gear, 25...
Disc, 26... lever, 27... bolt, 28,
30, 31...Bolt, 29...Rotation center pin,
33... Head body, 35, 36... Handle, 40
... Circular saw, 41 ... Gear, 42 ... Replaceable socket, 50 ... Screw.

Claims (1)

[Claims] 1. A support stand is provided on the cart via a 3-axis rotating device, and a swinging stand is provided on this support stand for free rotation, and a circular saw is attached to the tip of the swinging stand. The circular saw and the oscillating stand are interlocked and driven by an engine, the engine is mounted on the oscillating stand, and the 3-axis rotation device is connected to a first arm that is installed upright on the cart. A rotating shaft, a second rotating shaft provided on the first rotating shaft, and a gear provided on the first rotating shaft form a pair of meshing gears, and a pair of meshing gears are formed on the second rotating shaft. A lawn mower, characterized in that it is formed by a coaxial gear and a third rotary shaft rotatably provided, and can be selectively used for sleeve mowing and surface mowing by rotation of the gear. 2. The lawn mower according to claim 1, wherein one of the plurality of head bodies having rotation axes at different angles with respect to the arm is replaceably provided on the arm. 3. The mower according to claim 1 or 2, wherein both the first rotation shaft and the second rotation shaft can be fixed in a non-rotatable manner. 4. The mower according to claim 1, wherein the circular saw is reversible. 5. The lawn mower according to claim 1, wherein the oscillating table is driven by an engine. 6. The mower according to claim 1, wherein the operating handle is attached to a support stand or a swing stand.