JPH058811Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a cover structure for a flail-type mower that cuts grass with a flail blade (hereinafter referred to as a hammer knife) that is supported horizontally on a working part that is attached to the front of the main body so that it can move left and right. It is related to.

The grass that is cut with a flail type mower can be long or short, hard or soft, so the height of the hammer knife above the ground must be adjustable so that it works optimally in any situation. The height of the hammer knife is normally adjusted by providing a gauge foil in front of the hammer knife and adjusting the height of the gauge foil. Since it is necessary to perform this height adjustment even during work, it is desirable that the height be adjusted remotely from the main body. Furthermore, if the flail blade is capable of moving left and right with respect to the main body, it must be possible to adjust the height without interfering with this function. On the other hand, cut grass is ejected forward, and if the gauge foil is made higher and the space in front is wider, the amount emitted will inevitably increase. However, depending on the length and hardness of the grass stem, it may not be possible to secure a sufficient amount of release by adjusting only the gauge foil. This invention solves these problems.

Hereinafter, a case will be described in which an embodiment of this invention is applied to a lawn mower having a hammer knife attached to the horizontal rotating shaft. Such mowers are often used to cut undergrowth in orchards, and therefore, such a function is particularly required in order to effectively cut grass near trees.

Figure 1 is a side view of the mower, Figure 2 is a plan view, Figure 3 is a longitudinal sectional view of the working part, Figure 4 is a developed sectional view of the transmission mechanism, etc., and Figure 5 is an oblique plan view of the gearbox. However, the lawn mower can be roughly divided into main body part A.
and a working section B provided at the front part.

The main body part A has wheels 2, 2 mounted on a machine base 1, a transmission 3 and an engine 4 are mounted on the machine base 1, and handles 5, 5 are also extended to the rear. .

Working part B includes a rotary part 6 and a gauge wheel part 7.
Of these, the rotary part 6 is integrated by spanning the left and right side plates 8, 8 with a connecting pipe 9, and furthermore, a work shaft 10 is rotatably mounted in the center of both side plates 8, 8. This work shaft 10
Hammer knives 11... are attached radially. A cover 12 is provided above the rotation locus of the hammer knife 11 to cover it, and both ends of this cover 12 are fixed to the side plates 8, 8 described above. The front part of the cover 12 is replaced with a sub-cover 13 that can be raised and lowered freely, and a sag 14 made of rubber or the like hangs down from the front end, and a sag 15 is also provided at the rear end of the cover 12. ing. By the way, the vertical configuration of the sub cover 13 is such that the rear end of the top surface 13a of the sub cover 13 is connected to the hinge 60.
It is rotatably attached to the cover 12 with
A bolt (not shown) is inserted between this hole 61 and a hole (not shown) drilled in the side plate 8 to fix it, and the height can be adjusted by replacing this hole 61 one after another. I can think of something to do.

As a result of the above, the grass stems growing on the ground push the sag 14 backward as the aircraft advances, and the sag 14
It is taken in by the hammer knife 11 through the gap between it and the ground and is cut down. The cut grass stalks are discharged forward, some of which are discharged forward through the above-mentioned gap, and the remainder collides with the hangings 14 and falls to the ground.
Note that releasing some of the grass stalks forward is not possible if all the grass stalks have fallen into the rotary section 6.
This is because the braking resistance becomes too large and the layer of grass stalks spread on top becomes too thick, impeding the aircraft's progress. Therefore, at this time, these problems can be solved by turning the sub-cover 13 on its back so that it can also be released from the gap between it and the hanging upper part.

The gauge foil portion 7 includes a gauge foil 17,1 at the tip of an arch-shaped arm 16 having an L-shape in side view.
Since the arm 16 is pivotally connected to the side plates 8, 8 with pins 18, 18, the gauge wheels 17, 17 are
The structure allows rotation around this point. and,
A handle 19 connected to the arm 16 for adjusting the height of the gauge wheels 17, 17 is extended to the handles 5, 5 of the main body part A, so that it can be operated at hand. Note that working part B moves left and right,
In order for the handle 19 to handle even this case, a bending joint 20 or the like is inserted in the middle of the handle 19.

Next, the work part B is mounted and supported as follows.

That is, a gearbox 22 is installed in front of the main body A, which is firmly fixed to the transmission 3 of the main body A through attachment members 21, 21. Two sleeves 23 and 24 are provided on one side of the gearbox 22.
These sleeves 23, 2
Pipes 25 and 26 are provided which are inserted through the 4 and can be slid freely, respectively, and the outer ends of the pipes 25 and 26 are fixed to one of the side plates 8 and 8, respectively. Furthermore, in the gearbox 22, the above-mentioned connecting pipe 9
A hole 27 is formed at the corresponding position, and the connecting pipe 9 is inserted through and held in the hole 27. Therefore, working part B
is the connection pipe 9 to the gearbox 22.
is supported by the hole 27, and the pipes 25 and 26 are supported by the sleeves 23 and 24, respectively, and both of them move (slide) in the left and right direction.
Therefore, by applying some external force, the entire working part B can be moved from side to side.

Mechanisms for transmitting power to the working part B (driving the working shaft 10) and moving the working part B left and right are required, and these are constructed as follows.

First, the transmission mechanism 28 that transmits power to the working part B
However, by inserting the input shaft 29 from one side of the gearbox 22 (the side opposite to the sleeve 23 etc.),
A transmission shaft 30 is installed parallel to this, and both of these 2
9 and 30 are connected by gear connection or the like. Transmission shaft 30
A spline shaft 33 is connected to one end of the spline cylinder 31, which is extended through the sleeve 24, and which is also accommodated in the pipe 26, with its outer end projecting into a chain case 32 fixed to the side plate 8. Fit the inner end with the spline. As a result, even if the sleeve 24 and pipe 26 expand and contract,
The power of the transmission shaft 30 is transmitted to the spline shaft 33 without being hindered. In addition, chain case 3
2, a drive shaft 34 connected to the work shaft 10 is provided at the position of the work shaft 10, and sprockets 36 and 37 connected to the spline shaft 33 and the drive shaft 34 through a chain 35 are fixed respectively. Therefore, the power of the transmission shaft 30 is ultimately transmitted to the work shaft 10.

By the way, in this invention, an intermittent and transmission mechanism 38 is incorporated into the transmission mechanism 28 as described above. That is, two gears 39 and 4 are connected to the input shaft 29.
0 is tightly fitted, and the gear 40 of these is tightly fitted to the transmission shaft 3.
The gear 41 is always meshed with the gear 41 which is loosely fitted on the transmission shaft 30, and is also spline fitted onto the transmission shaft 30.
A clutch gear 42 is provided that can slide into and out of engagement with the gear 39. Therefore, by forming clutch shapes 42' and 41' on the opposing surfaces of the clutch gear 42 and the gear 41, respectively, the engagement and disengagement of the clutch shapes 42' and 41' or the engagement and disengagement of the gear 39 and the clutch gear 42 can be performed. , it will be possible to change speed and intermittent operation. Note that a pulley 43 is fixed to the end of the input shaft 29 to receive power from the engine 4.

The moving mechanism 44 has a connecting shaft 45 disposed within the gearbox 22 on an extension (concentrically) of the input shaft 29.
are connected to each other so as to be relatively rotatable, and the other end of the connecting shaft 45 is connected to a threaded shaft 46. Note that this threaded shaft 46 also extends inside the sleeve 23, and its outer end is connected to the end of the pipe 25. Formed nut part 4
Screw it into 7.

The input shaft 29 as described above, the connecting shaft 45 concentric therewith, and the transmission shaft 30 installed parallel to these
A forward/reverse switching mechanism 48 for the screw shaft 46 is installed between them.

That is, a clutch 49 having clutch shapes 49', 49' formed on both sides thereof is slidably spline-fitted onto the connecting shaft 45, and transmission wheels 50, 51 rotating in forward and reverse directions are mounted on both sides of the clutch 49, respectively.
Leave it loosely fitted. And each transmission wheel body 50,
51 has a clutch shape 50',
By forming 51', the connecting shaft 45, and therefore the threaded shaft 46, rotate in the forward and reverse directions when the clutch 49 is engaged and disengaged by sliding. Note that when the screw shaft 46 rotates in the forward and reverse directions, the pipe 25
The pipe 25, and therefore the entire working section B, is moved from side to side by the nut portion 47. By the way, the two transmission wheels 5 mentioned above
Torque transmission to 0 and 51 can be performed by two transmission wheels 52 and 53 loosely fitted onto the transmission shaft 30.
That is, one set of transmission wheels 50 and 52 are directly gear meshed, and the other set of transmission wheels 51 and 53 are connected to the chain 5.
4 is considered as a chain drive.

The clutch gear 42 and the clutch 49 are slid by a lever or the like. That is, levers 55 and 56 linked to each other by a lever or the like may be provided outside the gearbox 22, and these may be operated directly by hand or remotely via the operating cable 57.

Note that the above-mentioned examples of the mower are illustrative, and the invention is not limited thereto, and can be applied to other similar working machines (e.g., tillage equipment, road cleaning equipment, etc.). Of course, the same applies.

Since this invention has been described above, the following effects can be expected. That is, the height of the gauge foils 17, 17 is adjusted according to the length, hardness, softness, etc. of the grass stems, and thereby the hammer knife 11...
At this time, if the sub-cover 13 is adjusted in elevation, the width of the ejection space in this part formed by the sub-cover 13 and the sag 14 can also be adjusted. It can be adjusted. For example, for long stems, use 1 gauge foil.
If you make 7 and 17 higher, hammer knife 11
... will also become taller, and the discharge space will also become wider to accommodate this, but at this time, if the degree of long stems is large, the sub cover 13
By turning the plant on its back and widening the discharge space in this area, the amount of discharge from this area also increases, allowing the entire plant stem to be discharged smoothly and reducing discharge resistance. The height of the hammer knife 11 can be adjusted by tilting the gauge wheels 17, 17 without interfering with the function of the hammer knife 11, even if the hammer knife 11 has a structure that moves from side to side. This is made possible by remote control from the main body A.

[Brief explanation of drawings]

The drawings show the case where this invention is applied to a lawn mower. Figure 1 is a side view of the lawn mower, Figure 2 is a plan view of the same, Figure 3 is a longitudinal sectional view of the working part, and Figure 4 is a side view of the lawn mower. 5 is a developed sectional view of the transmission mechanism, etc., and FIG. 5 is an oblique plan view of the gearbox. Code, 8... Side plate, 11... Flail blade, 12
...Cover, 13...Secondary cover, 16...Arm, 17...Gauge foil.

Claims (1)

[Scope of utility model registration request] A flail blade 11 whose upper part is covered with a cover 12, is supported between both side plates 8 and 8, and is driven by a transmission mechanism 28, and a gauge foil 17, 17 at the tip.
The arm 16 is mounted on the arm 16 and is pivotally connected to the side plates 8, 8.
In a flail-type mower, a working part B is attached to the front of the main body part A so as to be movable from side to side by a moving mechanism 44.
9 through a bending joint 20 to the working part B and screwed onto the arm 16, and by rotating this handle 19, the ground height of the flail blades 11 can be adjusted, and the front part of the cover 12 can be Replace with cover 13,
A cover structure for a flail type mower, characterized in that the sub cover 13 is configured to be able to be raised and raised relative to the cover 12.