JP6162676B2 - Mower - Google Patents

Description

  The present invention relates to a mowing machine that is installed in close contact with the side of a body with a hanging string and can perform mowing by swinging a rotary blade around the center of the body.

In general, this type of mowing machine swings a rotating blade at the center of the body when mowing, and cuts the grass with half the blade in front of the swinging direction, but the rear half of the swinging direction does not contribute to mowing. However, the cut grass may get entangled, and in such a case, the rotating blade may be stopped by the entangled grass. Therefore, in the mowing machine, it is important that the grass cut when the rotary blade is swung in the mowing direction does not go around the rear blade that does not contribute to mowing. In view of this, a mowing machine has been proposed in which grass cut by a half blade in front of the swing direction is kept on the upper surface of the rotary blade (Japanese Patent Laid-Open No. 2003-143919). This mower can be said that the mowed grass is less likely to get entangled with the blade on the rear side in that the mowed grass can be kept on the upper surface of the rotary blade.
Japanese Patent Application No. 2003-143919

  However, with the mowing machine of the above-mentioned Patent Document 1, it is impossible to keep most of the mowed grass, and it often turns to the rear side in the swinging direction. There were many things that stopped.

  The present invention solves the above-mentioned problems, and the object of the present invention is to reliably keep the grass mowed by the half facing the swinging direction when mowing the grass, making it difficult to go around the back side and Is to provide a mower that does not get entangled.

  In order to achieve the above object, a mowing machine according to the present invention is provided with a suspension shaft or a hollow shaft provided with a receiving tool for locking a hook provided on the suspension strap and an operation handle, and a driving machine at the base end of the shaft. A circular upper plate having a gear box having two driven gears that receive rotations in opposite directions via a tip gear of a shaft rod connected to the drive unit is provided at the tip, and the lower surfaces of the circular upper plate are mutually connected An upper rotary blade and a lower rotary blade that rotate in opposite directions are provided so that the blade portion protrudes from the outer periphery of the circular upper plate, and a ground rotary plate that rotates integrally with the lower rotary blade is provided. A grass receiving plate for receiving the grass cut along the length direction of the shaft is provided on the upper surface, and a concave curved portion for enclosing the cut grass is provided on the distal end side and the proximal end side of the grass receiving plate, and the cut grass Is configured not to wrap around the back side.

  Further, the mowing machine according to claim 2 is provided with a guide plate for guiding the cut grass to the concave bent portion at the lower outer edge of the concave bent portion on the base end side of the grass receiving plate, so that the cut grass is securely attached to the grass receiving plate. It was configured to guide.

  According to the present invention, even when mowing the grass on the ground, pebbles and the like are not scattered, and grass can be cut safely and securely in a park or playground where many children and adults are playing. Since it is held by the grass receiving plate and does not escape the grass to the back side, it does not get entangled with the rear rotating blade. Also, the grass that was cut when mowing while repeating the movement of the blade itself to the left and right is once stopped by the grass catch plate and collected in a bowl shape at the turn place. Various excellent effects such as eliminating the need for tidying up are obtained.

  Further, according to the invention according to claim 2, the grass cut by the guide plate can be surely guided to the concave concave portions on the base end side of the grass receiving plate, and the cut grass escapes to the rear side. It has an excellent effect that it can be regulated.

  Next, embodiments of the present invention will be described with reference to the drawings. 1 is a partially cutaway perspective view of the mowing machine of the present application, FIG. 2 is an enlarged cross-sectional view schematically showing the configuration of the blade main body, FIG. 3 is an enlarged perspective view showing the upper rotary blade and the lower rotary blade in an overlapping manner, and FIG. FIG. 5 is a plan view showing a circular upper plate and a grass receiving plate fixed to the upper surface thereof, and FIG. 6 is a view of the mowing machine as viewed from the front side. FIG.

  As shown in FIG. 1, the mowing machine 1 of the present application includes a hollow shaft 6 provided with a receiving tool 4 for locking a hook 3 provided on a hanging strap 2 and an operation handle 5. The hanging strap 2 is for supporting the mowing machine 1 of the present application on the body, and may be integrally attached to the portion where the receiving member 4 of the shaft 6 is provided from the beginning. The operating handle 5 is provided with grip portions 5 "and 5" at both ends of the shaft 6 which are raised to the shaft 6 via a joint tool 5 '.

  A drive machine 7 is provided at the base end of the shaft 6, and a blade main body 8 is provided at the tip of the shaft 6. The blade main body 8 is connected to a driving machine 7 attached to the base end portion of the shaft 6 and is connected to a distal end gear 10 of a shaft rod 9 vertically passing through the shaft 6 as shown in FIG. And a circular upper plate 15 having a gear box 14 with two driven gears 13 and 13 'rotating in opposite directions to each other via a coaxial bevel gear 12.

  The drive 7 is preferably a small gasoline engine, but another power source (not shown) may be used as long as the output is satisfactory. The rotational speed and horsepower of the drive unit 7 may be adjusted by operating one finger (eg, thumb) holding the grip portions 5 ″ and 5 ″.

  A circular case 16 is screwed to the lower side of the circular upper plate 15. In the circular case 16, an upper gear 18 and a lower gear 18 ′ in the case are rotatably provided, and are linked to the driven gears 13 and 13 ′ in the gear box 14 so as to be horizontally opposite to each other. Meshes with the upper drive gear 17 and the lower drive gear 17 ′ which rotate in the same manner. A first rotator 19 is connected to the upper gear 18 in the case, and a second rotator 19 'can be connected to the lower gear 18' in the case (in opposite directions).

  A plurality of pins 20 are arranged in a circular shape on the lower surfaces of the first rotating body 19 and the second rotating body 19 ′, and are opposed to the pins 20, as shown in FIG. A pin hole 21 is provided in each of the lower rotary blades 23. The ground rotary plate 24 is overlaid on the lower surface of the lower rotary blade 23, and the ground rotary plate 24 is also provided with pin holes. The ground rotating plate 24 is configured so that the blade main body 8 can be operated in contact with the ground.

  The pin hole 21 has a shape in which a large circle portion 21a through which the head of the pin 20 can pass and a small circle portion 21b into which the shaft portion of the pin 20 is inserted are continuous. These heads are joined by passing them through the large circle portion 21a and then moving toward the small circle portion 21b (see FIG. 4). That is, the upper rotary blade 22 having the pin hole 21, the lower rotary blade 23 and the ground rotary plate 24 are coupled to the pin 20 in this order. After the ground rotating plate 24 is coupled to the pin 20, the ground rotating plate 24 is fixed so as not to come off when the expanding spring ring 25 biased in the reduction direction is engaged with the head of the pin 20. The

  A grass receiving plate 26 for receiving grass cut by the blade main body 8 is provided on the upper surface of the circular upper plate 15. The grass receiving plate 26 faces a position on the extension of the shaft 6, that is, the upper surface of the circular upper plate 15 in the half direction facing the mowing direction (solid arrow) A and the reverse direction (broken arrow) B. It is provided at a position where the half is folded. Of course, there is also a technique of cutting in the reverse direction (broken arrow) B in the sense of finishing the grass that has been cut away.

  At both ends of the grass receiving plate 26 on the front end side and the base end side, there are concave curved portions 27 and 27 ′ for enclosing the cut grass. The concavely bent portions 27 and 27 ′ serve to grab the trunk when the cut grass is long, and scrape when the length is short, and are cut behind the grass receiving plate 26. It is effective not to let the grass escape. The height H of the grass receiving plate 26 is preferably set to 5 to 15 cm. If it is lower than 5 cm, it cannot handle long grass, and if it is 15 cm or more, it becomes difficult to handle due to the center of gravity.

  Is the outermost end K of the concave curved portions 27, 27 'of the grass receiving plate 26 the same as the imaginary circle S passing through the outer ends of the respective blade portions 22', 23 'of the upper rotary blade 22 and the lower rotary blade 23? It is preferable that it is slightly inside. Outside the imaginary circle S, grass that cannot be cut by the blades 22 'and 23' will be caught by the concave curved portions 27 and 27 '. This is because escape to the rear side of the plate 26 is facilitated.

  A guide plate 28 that guides the grass cut by the blade portions 22 'and 23' to the concave curved portion 27 'is provided slightly downward on the outer edge of the concave curved portion 27' on the base end side of the grass receiving plate 26. ing. This is to surely guide the cut grass to the grass receiving plate 26 or the concavely curved portion 27 '. The guide plate 28 is not provided on the front end side of the grass receiving plate 26, but this is related to the rotation direction of the upper rotary blade 22.

  The peripheral portion 15a of the circular upper plate 15 is covered in an arc shape toward the base portion of the blade portion 22 'of the upper rotary blade 22 (in the drawing, a square shape). This is done so that the gap between the peripheral portion 15a of the circular upper plate 15 and the blade portion 22 'of the upper rotary blade 22 is made as small as possible so that the grass that has been cut is not entangled with the blade on both the mowing side and the rear side. Yes. A protective plate 29 is provided near the blade main body 8 of the shaft 6 so that the cut grass or the like does not rise along the shaft 6.

  Next, the operation of the present mower 1 will be described. First, the operator reverses the blade main body 8 provided at the tip of the shaft 6 so as to face up, and exposes the first rotating body 19 and the second rotating body 19 ′. The upper rotary blade 22 is coupled to the plurality of pins 20 disposed on each of the first rotary body 19 and the second rotary body 19 ′ via the pin holes 21, and then the lower rotary blade 23 and the ground rotary plate 24 are coupled. Let Finally, the expansion spring ring 25 is fixed so as not to come off.

  Next, after starting (driving the engine) a driving machine (gasoline engine) 7 provided at the base end portion of the shaft 6, an operator hangs the hanging string 2 and hooks the hanging string 2. Is fixed to the receiving device 4 provided on the shaft 6 so that the mowing machine 1 is held by the side. After that, when the grip portions 5 ″, 5 ″ of the operation handle 5 are gripped with both hands, a cutting-mowing posture for operating (shaking) the blade main body 8 at the tip portion of the shaft 6 can be achieved.

  Next, the mowing operation is started. By rotating the operation handle 5 by the accelerator operation, the rotational speed of the driving machine (gasoline engine) 7 is increased to MAX, and the operation handle 5 moves the blade main body 8 at the tip of the shaft 6 to the center of the body. Shake as 6 solid arrow A. Increasing the rotational speed of the blade main body 8 to MAX reduces the burden on the “blade” when mowing the grass, and also dramatically increases the mowing speed.

  This swinging of the blade main body 8 can be easily performed because the ground rotating plate 24 rotating integrally with the lower rotary blade 23 is brought into contact with the ground. In addition, since there are two blades of the upper rotary blade 22 and the lower rotary blade 23, even if there are pebbles or twigs, they are not scattered. For example, children and adults are near the mowing work in parks or schoolyards. It can be done without any problem.

  Further, when the operator moves the blade main body 8 as shown by the solid line A in FIG. 6, the grass is cut by the upper rotary blade 22 and the lower rotary blade 23 by the grass receiving plate 26 provided on the upper surface of the circular upper plate 15. You can stay. In particular, the concave portions 27 and 27 ′ are provided at both ends of the grass receiving plate 26, so that the mowed grass can be reliably encapsulated regardless of whether the mowed grass is long or short. When the height H of the grass receiving plate 26 is 5 to 15 cm, it can be surely kept even when the cut grass is long or short.

  Then, when the blade main body 8 is moved as shown by the broken line B in FIG. 6, the grass held on the grass receiving plate 26 remains in the place at the time of turning. It is. In other words, the grass cut by repeating the left and right movements of the blade main body 8 (solid line A and broken line B) will be collected in a hook shape at the turn place, so the cut grass scattered using rakes etc. There is an advantage that the work of collecting becomes unnecessary.

  Using this application mower 1, a mowing test was conducted in an urban park (Akigawa City Flower Park) with application permission. A large park was completed in 7 days (42 hours) (3 rotating blades were replaced). The grass collected in a basket was packed in a collection bag and carried out, but collecting work using a rake was unnecessary. On the other hand, it took 40 hours / person to perform grass mowing for the same number of days in another park using a hammer cutter for mowing and collecting scattered grass with a rake.

  Further, as described above, when the rotation speed of the blade main body 8 is increased to MAX, when the blade main body 8 is returned (broken line arrow B in FIG. 6), the grass like the vellus hair that is left at the time of going back is also cut down. There are many voices from residents in the neighborhood who say that they are beautiful when they see the surface after cutting.

  When mowing the blade body 8 around the body center when mowing with the mowing machine 1 of the present application, mowing the grass with half of the blade facing in the direction of travel, even if the rear half of the blade does not contribute to mowing for the time being Therefore, if the grass is tangled when facing the direction of travel, it can not only contribute to mowing but also stop rotating. It stays securely with a plate and does not escape backwards, so it never gets entangled with the half blades on the back side.

  With this application mower, the mowing grass is kept on the circular top plate so that it does not escape behind, so that mowing can be done safely and easily in parks and school gardens. The industrial applicability is high.

It is a partially cutaway perspective view of the present mower. It is an expanded sectional view showing the composition of a blade main part roughly. It is the expansion perspective view which piled up and showed the upper rotary blade and the lower rotary blade. It is a top view at the time of engagement which shows the relationship between a screw and a screw hole. It is a top view which shows a circular upper plate and the grass receiving plate fixed to the upper surface. It is the perspective view of the state which looked at the time of operation of this-application mower from the front side.

DESCRIPTION OF SYMBOLS 1 This-application mowing machine 2 Suspension string 3 Hook 4 Receiving tool 5 Operation handle 5 'Joint tool 5 "Grip part 6 Hollow shaft 7 Drive unit 8 Blade main body 9 Shaft rod 10 Tip gear 11 Relay gear 12 Bevel gear 13, 13' Drive gear DESCRIPTION OF SYMBOLS 14 Gear box 15 Circular upper plate 16 Circular case 17 Upper drive gear 17 'Lower drive gear 18 Upper gear in case 18' Lower gear in case 19 First rotary body 19 'Second rotary body 20 Pin 21 Pin hole 22 Upper rotary blade 23 Lower rotating blade 24 Ground rotating plate 25 Spring ring 26 Grass receiving plate 27, 27 'Concave curved portion 22', 23 'Blade portion S Imaginary circle 28 Guide plate 29 Protection plate

Claims (2)

A suspension shaft or a hollow shaft provided with a receiving device for locking a hook provided on the suspension strap and an operation handle is provided, and a distal end of a shaft rod connected to the drive device at a proximal end portion of the shaft and a distal end portion of the shaft. A circular upper plate having a gear box having two driven gears that receive rotations in opposite directions via a gear is provided, and an upper rotary blade and a lower rotary blade that rotate in opposite directions are provided on the lower surface of the circular upper plate. In a mowing machine in which a blade portion is provided so as to protrude from the outer periphery of the circular upper plate, and a grounding rotary plate that rotates integrally with the lower rotary blade is provided, an extension of the shaft on the upper surface of the circular upper plate is opposite to the mowing direction. A screen-shaped grass receiving plate that folds in the direction is provided , and a concave curved portion bent in a plane arc shape in the mowing direction is provided along the distal end side and the proximal end side of the grass receiving plate, The outermost ends of the curved parts are the upper and lower rotary blades. Equal to the imaginary circle passing through the outer end of the blade portion of respectively, characterized in that is slightly inwardly mower.   The mowing machine according to claim 1, wherein the grass receiving plate is provided with a guide plate that guides the grass cut to the lower outer edge of the concave portion on the base end side to the concave portion.

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