JPS6140082Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a power working machine that can be equipped with different types of rotary cutting blades, and particularly relates to a simple backpack-type weeding machine that can also be used as a power mower.

[Conventional technology and its problems]

Conventionally, backpack-type power brush cutters have a hollow shaft with an ultra-compact internal combustion engine installed at the top end that is tilted to the ground, while a disc-shaped rotary cutting blade installed at the bottom end of the shaft is approximately horizontal to the ground. Because it is arranged and works,
The operator can perform mowing work extremely easily. In addition, focusing on the lightness of such work, we improved the backpack-type power brush cutter to make it easier to use as an intertill weeder (a machine that removes weeds and crushes soil finely by sliding the cutting blade in contact with the ground). Work is also being done.

However, these conventional machines are dedicated machines for brush cutters and inter-till weed removers, respectively, and users who perform these tasks must purchase them separately, which not only increases the price but also requires additional storage space. There were some difficulties, such as the need for

On the other hand, at the upper end of the hollow shaft of the backpack-type power agricultural machine,
A backpack-type power farming machine equipped with an ultra-compact internal combustion engine and a horizontally or vertically rotating work implement attached to the bottom, and used for agricultural work such as weeding, reaping, and cultivating soil: This is already known (Utility Model Publication No. 35-21122). However, in order to carry out various types of agricultural work using such a backpack-type power farming machine, a transmission is required to rotate the implement at a rotation speed specific to the agricultural work. Since the transmission is integrated with the ultra-compact internal combustion engine at the upper end of the hollow shaft, the weight of the upper part of such agricultural machinery is large, and the operability of the hollow shaft becomes difficult when the shaft is swung at hand. There is the problem that the rotation speed deteriorates, and the problem that the transmission must be operated to obtain the optimum rotation speed for each agricultural task.

[Means for solving problems]

Therefore, this invention was devised to eliminate these problems. For example, it can be used as both a brush cutter and a simple weed remover, and moreover, it can achieve its optimal function by simply replacing the cutting blades of each. We are proposing a dual-purpose machine that can do this.

This will be explained according to the embodiment shown in the attached drawings. FIG. 1 is a schematic view of the whole, in which 1 is a hollow shaft with a micro internal combustion engine 2 attached to its upper end, and the internal combustion engine 2 drives the hollow shaft 1. Drive shaft 3 (second
(see figure), and the drive shaft 3 is used to drive the rotary blade 4 for mowing or mid-tillage weeding (Fig. 1 shows the rotary cutting blade for mid-tillage weeding) so that it is approximately horizontal to the ground. I try to do the work individually. Reference numeral 5 denotes a gripping portion, which is a shoulder portion of a belt (not shown) that is suspended near this gripping portion, and is placed on the shoulder of the operator.

FIG. 2 shows details of the embodiment of the present invention shown in FIG. 1, and shows the inside of a gear casing 6 that is detachably attached to the tip of the hollow shaft 1. As shown in FIG.
The gear casing 6 has an inclined shaft cylinder 8 and a horizontal shaft 9 integrally formed so that the axis of the hollow shaft 1 and the axis of a high-speed shaft 7, which will be described later, intersect at an angle of 45 degrees as shown in the figure. It is something that exists. The gear casing 6
A slit 31 is provided in the side axial direction of the inclined shaft cylinder 8, and a flange 32 protrudes across the slit 31.
The bolt 33 is also tightened and fixed to the hollow shaft 1. A bevel gear 11 having a perforated shaft 10 on one end of which the drive shaft 3 can be freely inserted and removed is incorporated into the inclined shaft cylinder 8 via a bearing 12, and a high-speed shaft is installed in the horizontal shaft cylinder 9. 7 is incorporated as described below. Another bevel gear 13 that meshes with the bevel gear 11 is fixed to one end of the high-speed shaft 7 with a key 14.
Also, a worm 15 is engraved near the middle,
Further, a PTO screw 16 is carved at the other end. The high-speed shaft 7 is assembled into a horizontal shaft cylinder 9 via a bearing 12. In FIG. 2, a rotary table 17 is screwed onto the PTO screw 16, and a cover plate 18 is tightly screwed onto the outer surface of the rotary table 17, but the cover plate 18 will be described later. It can be replaced with a rotating cutting blade 34. These turntables 1
7 and the cover plate 18 are completely fixed to the high-speed shaft 7 with bolts 19 to prevent them from coming off.

The rotary table 17 is in contact with the inner race of the bearing 12 on its inner diameter, and has a recess 20 on its outer diameter, which covers the end of the horizontal shaft cylinder 9 in a slightly fitted state. This bearing 12 also has a collar 2 that is integrally protruded from the high-speed shaft 7.
1 and a circlip 2 fitted into the inner surface of the horizontal shaft cylinder 9
2 is also pinched to determine the position in the axial direction.

3 is a sectional view taken along arrows A to A in FIG. 2, and FIG. 4 is a sectional view taken along arrows B to B in FIG. are integrally formed, and a worm gear 24 that meshes with the worm 15 is built into the side cylinder 23. In the illustrations of FIGS. 3 and 4, the worm gear 24 is at an angle of 90 degrees with the high-speed shaft 7. Low-speed shafts 2 intersecting and becoming perpendicular
5 is assembled into a short tube 26 provided at the opening of the side tube 23 via two bearings 12, 12. The short tube 26 is also attached with a bolt (not shown),
It is fixed to the opening of the side tube 23. Low speed shaft 2
The outer end of 5 is the PTO screw 1 of the high-speed shaft 7.
Similarly to 6, a screw 27 is formed, and the bolt 30 is further pressed and fixed thereto from the outside.

Since the structure is as described above, first of all, talking about the brush cutting work, when the bolts 33 of the gear casing 6 shown in FIG. While the inclination angle of the shaft cylinder 8 remains at 45 degrees, the high-speed shaft 7 becomes perpendicular to the ground, and the bolt 33 is tightened again. Also, remove the bolt 19 of the high-speed shaft 7, fit the rotary cutting blade 34 for brush cutting into the screw 16 instead of the cover plate 18, and fix the rotary cutting blade 34 to the rotating table 17 with the bolt 19. Installing. Therefore, the rotary cutting blade 34 comes to be arranged substantially horizontally with respect to the ground, and when the internal combustion engine 2 starts, the high-speed shaft 7 rotates at high speed without being decelerated. Its usage is the same as before.

Next, in the case of mid-tillage weeding work, loosen the bolts 33 of the gear casing 6 and turn the gear casing 6 to change its position relative to the hollow shaft 1 so that the low-speed shaft 25 is vertical, as shown in Fig. 4. , tighten again. In addition, the cover plate 29 of the low-speed shaft 25 is removed, and the rotary cutting blade 4 (fourth
(The two-dot chain line in the figure shows a device that makes cuts in a steel disc and bends them to form a cutting edge that pulls soil into the center for weeding.) is inserted, brought into close contact with the rotary table 28, and secured by overlapping with the bolts 30. Therefore,
The rotary cutting blade 4 is arranged substantially horizontally with respect to the ground,
The power of the internal combustion engine 2 is transmitted through the worm 15 to the worm gear 24 at a reduced speed, and the rotation speed becomes suitable for weeding work during tillage, which has a large resistance, and the power is transmitted to the rotary cutting blade 4.
to drive.

In summary, in the present invention, an ultra-compact internal combustion engine 2 is attached to the upper end of a hollow shaft 1 that incorporates a drive shaft 3 that is inclined with respect to the ground, and a rotary blade that rotates on a horizontal plane is attached to the lower end. In a power working machine with a backpack-type rotary blade that rotates a rotary cutting blade, a gear casing 6 having two output shafts with different rotational speeds and different axis directions is connected to the hollow shaft 1. These two output shafts are respectively interlocked and connected to the drive shaft 3 through a gear group, and the mounting position of the gear casing 6 relative to the hollow shaft 1 is changed by rotating, This is a backpack-type power working machine with a rotary blade, in which one of these two output shafts is oriented perpendicular to the ground, and a rotary cutting blade is attached to the lower end of the vertical output shaft. , has the following effects.

[Effects of the invention] Since two output shafts are configured to have different optimal rotational speeds depending on the type of agricultural work, simply attaching a rotary cutting blade to either of these output shafts will immediately produce the desired results. A rotational speed of 100 mL can be obtained, and predetermined agricultural work can be carried out simply by gripping and swinging the hollow shaft without performing a speed change operation.

At least a vertical output shaft is interlocked and connected to the inclined drive shaft through a gear group, so that the vertical output shaft and other output shafts with different rotational speeds are installed in a cross-shaped manner. In addition, by simply rotating the gear casing with respect to the hollow shaft, either output shaft can be configured to be vertical. Therefore, there is no need to take the trouble of removing and replacing the gear casing, or to increase the size of the gear casing by installing two vertical output shafts in parallel.

Since the gear casing, which is a so-called transmission case, is located near the ground, vibrations generated in that part are absorbed by the workpiece, such as weeds and soil, reducing vibrations to the gripping part. The weight of the upper end of the shaft has been reduced, improving operability.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an embodiment of the present invention, FIG. 2 is a cross-sectional view of the essential part of the embodiment of the present invention, and FIG.
FIG. 4 is a cross-sectional view taken along the line B-B in FIG. 3, and FIG. 5 is an external view of the brush-cutting rotary blade attached to FIG. 3. 3 ... drive shaft, 4 ... rotary blade (for weeding), 6 ... gear casing, 7 ... high-speed shaft,
25...Low speed shaft, 34...Rotary cutting blade (for brush cutting).

Claims (1)

[Claims for Utility Model Registration] An ultra-compact internal combustion engine 2 is attached to the upper end of a hollow shaft 1 that incorporates a drive shaft 3 that is inclined with respect to the ground, and a rotary blade that rotates on a horizontal plane is attached to the lower end. In a power working machine with a backpack-type rotary blade that rotates the rotary cutting blade with The gear casing 6 is attached to the lower end of the shaft 1, and these two output shafts are interlocked and connected to the drive shaft 3 through a gear group, and the mounting position of the gear casing 6 relative to the hollow shaft 1 can be changed by turning. A backpack-type power working machine with a rotary blade, in which the orientation of one of these two output shafts is perpendicular to the ground, and a rotary cutting blade is attached to the lower end of the vertical output shaft.