JP2011036214A - Water-pressure grass cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To cut grasses by using a high-pressure water jet stream. <P>SOLUTION: The water-pressure grass cutter 1 cuts grasses by the high-pressure water jet stream ejected from an ejection nozzle 2. The ejection nozzle 2 is supported at a lower end (tip end) of an extensible handle 3 (supporting member) made of an aluminum alloy, the length of the extensible handle 3 is adjusted by a worker to a length suitable for grass-cutting work, and the grass-cutting work can be carried out in a comfortable position by holding the extensible handle 3 by the worker. The extensible handle 3 has a structure to enable insertion of a small-diameter pipe 3B into a large-diameter pipe 3A, and a high-pressure hose 15 is passed through the small-diameter pipe 3B. The extensible handle 3 has a wheel 5 rotatably supported by a rotary shaft 4 at a lower end of the handle. The ejection nozzle 2 is attached to the rotary shaft 4 of the wheel 5. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a hydraulic mower that cuts grass such as grass and tree branches using a high-pressure jet water stream.

  Conventionally, mowing machines for mowing grass such as roads and parks are known, but such mowing machines rotate a cutter such as a rotary blade with a small engine or motor (for example, patent document). 1).

  Such mowers are hand-held while floating at a certain height with a cutting blade that is rotated by an operator (mainly metal blades, but there are also types that rotate by turning a string such as nylon). This is a method to mow the grass by moving it forward and swinging left and right, and the weight and vibration of the machine body, and because it can not be mowed if it does not swing left and right, it was a heavy burden on the physical strength .

JP 2009-125056 A

  In the case of the method of cutting grass with a metal cutting blade as described above, the cutting blade hits obstacles such as pebbles that roll innumerably on the ground, guardrail iron pillars and fences in the actual work, and the cutting blade itself The blade will be damaged or worn out, and the sharpness will gradually deteriorate. If the blade is not replaced, the work cannot be continued. In addition, the work of the operator to visually cut the rotating blade close to the limit of obstacles such as pebbles and steel pillars was also a mental burden and was not efficient.

  In addition, when mowing grass such as long slopes and depressions, the length and angle of the handle is fixed, so the cutting edge only reaches a certain range, and the operator reaches (or descends) the slope with bad footing. I had to go to the place to work, and the work itself was dangerous.

  Therefore, the inventor has conceived that the grass is cut by using a high-pressure jet water stream instead of the conventional metal cutting blade for mowing the grass and makes the present invention.

  An object of the present invention is to provide a mower that can cut grass using a high-pressure jet water stream.

  The invention of claim 1 includes at least one injection nozzle, a support member that supports the injection nozzle and can be gripped by an operator, pump means for supplying high-pressure liquid to the injection nozzle, and the injection nozzle. And a high pressure resistant hose connected to the pump means.

In this way, it can be cut by spraying a high-pressure jet water stream at the base of the grass, so even if there are obstacles such as stones or iron pillars in the mowing ground, conventional cutting blades made of metal etc. It can be used with the same sharpness over a long period of time without being damaged. In other words, by adjusting the water pressure in the case of high-pressure jet water flow, it is possible to set so that relatively soft grass can be cut but hard stones and iron are not cut, and there are obstacles such as stones and iron pillars on the grass. Even so, it is possible to cut only relatively soft grass without worrying about the cutting edge.
Moreover, since the cutting of the grass itself is performed by a high-pressure jet water stream ejected from the nozzle, there is no need to swing the blade edge to the left and right as in the conventional case, and the work burden is greatly reduced.
Further, since it is not worn or damaged like a metal cutting blade, the grass can be cut for a long time with the best sharpness, and it is not necessary to replace the blade, which is economical.

  In this case, as described in claim 2, the jet nozzle preferably has a diameter of about 1.0 mm to 0.5 mm, and the pump means preferably has a liquid supply pressure of 20 MPa to 30 MPa.

  According to a third aspect of the present invention, the support member has a wheel rotatably supported by a rotation shaft, and the injection nozzle is provided with respect to the rotation shaft of the wheel. You can also

  If it does in this way, grass can be cut in the position of the height of the axis of rotation of a wheel by moving an injection nozzle, rolling a wheel on the ground of a mowing ground.

  According to a fourth aspect of the present invention, the support member has a structure in which a small-diameter pipe is slidably fitted in a large-diameter pipe, and the injection nozzle is provided at the tip of the small-diameter pipe. The spray nozzle and the high pressure resistant hose inserted through the small diameter pipe are connected.

  In this way, the high-pressure resistant hose can be stored in the pipe, so that it can be stored compactly, while the pipe can be extended to an appropriate length during use.

  In other words, the support member is not a conventional fixed-length shaft, but a small-diameter pipe is slidably fitted in a large-diameter pipe, and a high-pressure hose is built in the small-diameter pipe. In addition, the length of the support member can be freely expanded and contracted according to the work, so that it can cope with a high place and a low place that have not been reached so far, and the risk of work is reduced.

  Preferably, the support member includes a pressure adjusting member that controls a supply pressure of the liquid supplied by the pump unit.

  If it does in this way, the cutting capability by a high-pressure jet water stream can be adjusted according to the kind etc. of grass by adjusting the supply pressure of liquid.

  Since the present invention cuts grass using a high-pressure jet water stream instead of a conventional metal cutting blade, even if there are obstacles such as hard stones or iron pillars in the mowing ground, the cutting edge as before Will not be worn or damaged by collision, and the sharpness will not deteriorate over a long period of time. Further, since the operator does not need to swing the blade edge and it is not necessary to avoid obstacles by visual observation, the operation itself can be performed much more easily than before. In addition, it is economical because it is not necessary to replace it with a cutting blade made of metal or the like. In addition, since the length of the handle can be expanded and contracted, the work in a dangerous state with a poor scaffold is reduced and it is safe.

It is explanatory drawing which shows one Embodiment of the hydraulic-type mower concerning this invention. It is explanatory drawing of the pipe structure used as a supporting member. It is explanatory drawing which shows the relationship between a wheel and an injection nozzle. It is explanatory drawing of another embodiment. It is explanatory drawing of another embodiment. It is explanatory drawing of another embodiment. It is explanatory drawing of another embodiment. It is explanatory drawing of another embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the hydraulic mower 1 cuts grass with a high-pressure jet water stream ejected from an ejection nozzle 2. This injection nozzle 2 is supported by the lower end (tip portion) of a stretchable handle 3 (support member) made of aluminum alloy, and the operator adjusts the length of the stretchable handle 3 to a length that facilitates mowing work, An operator grasps an appropriate position of the stretchable handle 3 so that the mowing work can be performed with a reasonable posture.

  As shown in FIG. 2, the stretchable handle 3 has a pair of pipes 3A and 3B, and a small-diameter pipe 3B is slidably fitted in the large-diameter pipe 3A. The length can be adjusted by accommodating the small-diameter pipe 3B.

  The stretchable handle 3 has a wheel 5 that is rotatably supported by a rotating shaft 4 at a lower end portion. An injection nozzle 2 is provided for the rotating shaft 4 of the wheel 5.

  The water sprayed from the spray nozzle 2 is stored in a water tank 12 on the movable carriage 11. The water in the water tank 12 is supplied and injected in a high pressure state to the injection nozzle 2 through a high pressure resistant hose 15 by a high pressure pump 14 (pump means) driven by a high output small engine 13. That is, the high pressure pump 14 and the injection nozzle 2 are connected by the high pressure resistant hose 15, and the high pressure resistant hose 15 is inserted into the small diameter pipe 3B. In addition, when the water in the water tank 12 runs out, the water can be cut using water from a nearby irrigation channel or pond.

  A bearing member 16 is attached to the lower end of the small-diameter pipe 3B, and the wheel 5 is rotatably supported by the bearing member 16 via a bearing (not shown). The rotating shaft 4 of the wheel 5 is a cylindrical shaft, and both end portions protrude outward from the bearing member 16. An injection nozzle 2 is provided at one projecting end of the rotating shaft 4, and a high-pressure resistant hose 15 led from the inside of the small-diameter pipe 3 </ b> B is connected to the other projecting end, so that the inner space of the rotating shaft 4 is However, it is a water channel for supplying high-pressure water to the injection nozzle 2.

  A throttle lever 16 (pressure adjusting member) for controlling the supply pressure of water (liquid) supplied by the high-pressure pump 14 is provided in the vicinity of the upper end of the telescopic handle 3. The injection nozzle 2 has a diameter of about 1.0 mm to 0.5 mm, and the supply pressure of water (liquid) by the high-pressure pump 14 is 20 MPa to 30 MPa.

  When the hydraulic mower 1 is used, if a wheel 5 is brought into contact with the ground and rolled in a place where mowing is necessary, a high-pressure jet water stream is jetted at a certain height from the ground (position of the rotating shaft 4 of the wheel 5). By doing so, the grass can be cut. Therefore, since the worker can perform the mowing work only by moving the wheel 5 along the root of the grass, the physical burden is greatly reduced.

  Also, even if there are obstacles such as stone rollers or metal fences, the cutting blade will not be damaged by contact, so there is no need for the operator to avoid such obstacles visually, such as blade replacement. There is no need for maintenance.

  As a result, even in regular grass removal work such as on roads, work can be performed without worrying about guard pillars and curbs. In addition, it is possible to cut only weeds smoothly even in mowing work such as riverbeds full of stones and dikes constructed with stone walls.

  Furthermore, since the water pressure of the high-pressure jet water flow decreases in proportion to the distance, it is advantageous in terms of safety to the human body.

In addition to the above, the present invention can be modified as follows.
(i) In the embodiment described above, the pipes 3A and 3B are fitted in such a manner that the pipes 3A and 3B can be extended and contracted, and the length can be adjusted. However, as shown in FIG. 21 can also be used. It is also possible to provide the support member 21 with a grip portion 21a for the operator to grip. The injection nozzle 2A can also be provided directly at the tip (lower end) of the support member 21 without being provided on the rotating shaft of the wheel. In this case, a high pressure resistant hose 15 for supplying high pressure water to the injection nozzle 2 </ b> A is provided in the support member 21.
(ii) For mowing work, a high-pressure jet water stream can be jetted from the jet nozzle only when the wheel is installed on the ground. In this case, as shown in FIG. 5, valve means 31 that allows the flow of water when the wheel 5 is pressed against the ground is provided in the middle of a water passage 32 that supplies high-pressure water to the injection nozzle 2. . The valve means 31 is provided at the upper part of the bearing member 16 and slides so that the shaft member 33 having a communication passage 33 a in the middle and the water passage 32 to the injection nozzle 2 and the shaft member 33 intersects the water passage 32. A passage member 34 that is movably fitted, and a spring 35 that urges the passage member 34 in a direction to release the water passage 32 from being communicated by the communication passage 33a. These valve means 31 are covered with a cover member 36. Although not specifically illustrated, the water passage 32 has one end connected to the high pressure hose 15 from the high pressure pump 14 and the other end connected to the injection nozzle 2 through the rotating shaft of the wheel 5. Yes.

In this way, when the wheel is grounded on the ground, the passage member 34 descends against the force of the spring 35 due to its own weight, the water passage 32 is communicated by the communication passage 33a, and the high-pressure water is fed to the water passage 32 and the communication passage. A high-pressure jet water stream is jetted from the jet nozzle 2 through the nozzle 33a. On the other hand, when lifted from the ground, the water passage 32 and the communication passage 33a of the passage member 34 are moved away from each other by the force of the spring 35, and the water passage 32 is blocked by the shaft member 33 (the portion without the communication passage 33a). The injection of the high-pressure jet water flow from the injection nozzle 2 is interrupted.
(iii) The number of injection nozzles is not necessarily one, and a structure having a plurality of injection nozzles 2C as shown in FIG. In other words, any number of spray nozzles can be mounted on a single unit, and if these multiple spray nozzles are placed in front, they can be self-propelled for mowing work in large areas such as large rivers and wilderness. Application to large mowers is also possible.

  In addition, a device 41 that swings the injection nozzle 2C in the horizontal direction, for example, 15 degrees at a time can be provided so as to facilitate the mowing operation.

In this way, as shown in FIG. 7, for example, the mowing operation is performed by the high-pressure jet water stream injected from the injection nozzle 2 mounted on the movable carriage 11A, so that the support 42a such as the guard rail 42 and the large stone 43 are formed. Even if you are in a place to mow grass, it is not a metal blade, so you can mow grass without problems. In addition, 16A is a throttle lever and 44 is a brake lever.
In the above embodiment, the water tank 12, the engine 13 and the pump 14 are mounted on the movable carriage 11, but the water tank 22, the high output small engine 23 and the high pressure pump 24 are operated as shown in FIG. It is also possible to adopt a backpack system in which a person carries the back with a shoulder band 25. The margin of the high pressure resistant hose 15 is wound in preparation for extending the stretchable pattern 3. In this case, the amount of water discharged per unit time can be reduced so that the grass can be cut, so that the pump and engine can be reduced in size and weight. This can prevent the burden from increasing. By doing so, mowing is possible at any location where the operator can move.
(v) It is also possible to make the mobile carriage self-propelled. By adjusting the water pressure, the grass is cut, but obstacles such as stones and metal posts are not cut, and there is no risk of damage like a cutting blade, so regardless of the presence or absence of obstacles, without stopping Mowing work can be carried out continuously.
That is, as described above, any number of spray nozzles can be mounted on a single hydraulic mower, and for example, a plurality of spray nozzles that inject high-pressure jet water flow are installed on the front surface of a large hydraulic mower. By adopting a traveling type, even when weeding a wide range of weeds such as riverbeds, parks, roads, etc., we can complete the work far more efficiently than the current situation, and expect sufficient cost reduction by mechanization it can.

DESCRIPTION OF SYMBOLS 1 Hydraulic mower 2, 2A-2C Injection nozzle 3 Telescopic pattern (support member)
3A, 3B Pipe 4 Rotating shaft 5 Wheel 11 Moving cart 12, 22 Water tank 13, 23 High power small engine 14, 24 High pressure pump 15 High pressure hose

Claims (5)

At least one injection nozzle;
A support member that supports the spray nozzle and can be gripped by an operator;
Pump means for supplying high-pressure liquid to the spray nozzle;
A hydraulic mowing machine comprising a high pressure resistant hose for connecting the spray nozzle to the pump means.
2. The hydraulic mower according to claim 1, wherein the spray nozzle has a diameter of about 1.0 mm to 0.5 mm, and the pump means has a liquid supply pressure of 20 MPa to 30 MPa.
The support member has a wheel rotatably supported by a rotation shaft,
The hydraulic mower according to claim 1 or 2, wherein the injection nozzle is provided with respect to a rotating shaft of the wheel.
The support member has a structure in which a small-diameter pipe is slidably fitted in a large-diameter pipe,
The injection nozzle is provided at a tip portion of the small-diameter pipe, and the high-pressure hose inserted into the small-diameter pipe is connected to the injection nozzle. The hydraulic mower according to one.
  5. The hydraulic mower according to claim 1, wherein the support member includes a pressure adjusting member that controls a supply pressure of a liquid supplied by the pump unit.

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