JP4669488B2 - Brush cutter grounding body and brush cutter - Google Patents

Description

  The present invention relates to a grounding body and a brush cutter for a mower for mowing. Specifically, when mowing grass near an obstacle such as a wall or around a tree, the brush cutter is grounded and is easy to use, like a tip saw. The present invention relates to a technique for making it possible to cut a desired rotating blade safely and without touching an obstacle.

  In general, when mowing around an obstacle such as a concrete wall or around a tree, a rotary blade such as a tip saw is brought close to the obstacle. However, the rotary blade becomes an obstacle such as a concrete wall. Touching, damaging the rotary blade, and having a safety cover on the top of the rotary blade, can be dangerous. Thus, cutting near the obstacle is difficult and difficult to perform as desired.

  Therefore, in the past, when cutting, the rotary blade was removed from the brush cutter, and a disk-shaped substrate to which a rope cutter was attached was attached to the brush cutter (see, for example, Patent Documents 1 and 2).

  In this way, when cutting around obstacles, it is necessary to replace a rotary blade such as a tip saw and a special tool for cutting when the board is equipped with a rope cutter. It was.

By the way, in both the mowing work with a rotary blade such as a tip saw and the mowing work with a special tool for mowing when equipped with a rope cutter, the shoulder strap extended from the brush cutter is applied to the shoulder. It is a work to swing the brush cutter from side to side while holding the handle while raising the rotary blade and the rope cutter to a desired height from the ground surface. In addition, when a disk-shaped substrate to which a rope cutter is attached is attached to a brush cutter, it is difficult to stably ground the disk-shaped substrate to the ground surface.
Japanese Patent Laid-Open No. 8-130961 Japanese Patent No. 3170246

  The present invention has been invented to solve such a problem, and is easy to use by grounding a brush cutter when mowing grass near an obstacle such as a wall near a wall such as a concrete wall. It is an object of the present invention to provide a grounding body and a brush cutter for a brush cutter that can be cut safely when a rotary blade such as a tip saw does not touch an obstacle.

The invention according to claim 1 is attached to the lower surface of the receiving metal 10 mounted on the drive shaft 2 of the bush cutter B, Ru tread der brush cutter having a rotary blade 1 and the rope cutter 7 detachably. The grounding body A has a mounting plate 3 through which the drive shaft 2 of the brush cutter B is inserted and a recess 4 that accommodates the lower end portion of the drive shaft 2, and has a substantially bowl-shaped outer shape. The part 5 is provided by being integrally coupled. The mounting plate 3 is formed with a rotary blade mounting surface 8 for mounting the rotary blade 1 and a grounding body mounting surface 9 for mounting the grounding body A when the rotary blade 1 is removed on the mounting plate 3. . In the state where the rotary blade 1 is attached, the rotary blade mounting surface 8 of the mounting plate 3 is in contact with the lower surface of the rotary blade 1 and between the grounding body mounting surface 9 of the mounting plate 3 and the lower surface of the receiving bracket 10. The gap G is formed so as to be thinner than the thickness of the rotary blade 1. In a state where the rotary blade 1 is removed, the grounding body mounting surface 9 of the mounting plate 3 is provided so as to contact the lower surface of the receiving metal fitting 10. As the tip portion of the rope cutter 7 when fitted with a rotary blade 1 and the rope cutter 7 are both passes outside than the rotary blade 1, greater than the rotational locus of the rotary blade 1 rotation trajectory of the rope cutter 7 To do.
According to such a configuration, since the grounding body A includes the rotary blade 1 and the rope cutter 7 in a detachable manner, the rotary blade 1 such as a tip saw and the rope cutter 7 can be used in combination . At the time of combined use, the rotation trajectory of the rope cutter 7 is larger than the rotation trajectory of the rotary blade 1, so that the tip of the rope cutter 7 can pass outside the rotary blade 1, and a rotary blade such as a tip saw. The grass near the obstacle D can be safely cut off by the flexible rope cutter 7 without touching the obstacle 1 such as a stone or a tree on the wall 1 such as a concrete wall.
Moreover, since the grounding body A attached to the lower surface side of the rotary blade 1 rotates together with the rotary blade 1 and is in sliding contact with the ground surface E, the rope cutter 7 and the rotary blade 1 are maintained at a certain height from the ground surface E. it is possible. For this reason, the person who cuts the grass with the shoulder strap 12 on the shoulder, holds the handle 13 and maintains the rope cutter 7 and the rotary blade 1 at a certain height from the ground surface E, and swings the brush cutter B from side to side. But you can do it easily and as you wish.
By the way, the material of the grounding body A according to the first aspect of the present invention can be selected as appropriate, and may be a series of metal or synthetic resin having sufficient strength. The design of the configuration in which the grounding body A includes the rope cutter 7 can be changed. Further, the material of the rope cutter 7 can be appropriately selected from synthetic resin, plant fiber, metal and the like.
Further, since the rotary blade mounting surface 8 of the mounting plate 3 is brought into contact with the lower surface of the rotary blade 1, the rotary blade 1 is sandwiched between the mounting plate 3 and the catch 10 attached to the drive shaft 2. 1 can be attached stably, and the rotary blade 1 and the rope cutter 7 attached to the grounding part 5 integrated with the attachment plate 3 can be used together.
In addition, since the rotary blade 1 is attached, a gap G thinner than the thickness of the rotary blade 1 is formed between the grounding body mounting surface 9 of the mounting plate 3 and the grounding body receiving surface 28 of the metal fitting 10. When the rotary blade 1 is removed and the grounding body A is attached while the rotary blade 1 can be stably attached with increased holding force, the grounding body A receives the gap G that is thinner than the thickness of the rotary blade 1. approaching fitting 10 side, the grounding member mounting surface 9 of the mounting plate 3 Ru can contact the ground body receiving surface 28 of the receiving metal 10. Therefore, the grounding body A provided with the rope cutter 7 can be attached with the rotary blade 1 removed, and only the rope cutter 7 can be mowed.
In this case, since the gap G is thinner than the thickness of the rotary blade 1, the rotary blade 1 is removed and the grounding body mounting surface 9 of the mounting plate 3 is received and brought into contact with the grounding body receiving surface 28 of the metal fitting 10. In the state of attachment of the grounding body A, a gap K (FIG. 3) is formed between the rotary blade mounting surface 8 of the mounting plate 3 and the rotary blade receiving surface 27 of the receiving metal fitting 10, and the rotary blade mounting surface 8 is There is no contact with the surface 27 . Therefore, the rotary blade mounting surface 8 manufactured with high accuracy is not damaged or roughened, and there is no problem in mounting the rotary blade 1.

  Moreover, the rope cutter 7 can be removed from the grounding body A, and the mowing with only the rotary blade 1 can be performed.

  As described above, it is possible to select to use the rotary blade 1 and the rope cutter 7 in combination, to use only the rope cutter 7 or to use only the rotary blade 1, and to use them properly depending on the situation.

In the invention according to claim 2 , the mounting plate 3 is made of metal, the grounding portion 5 is made of synthetic resin, the metal mounting plate 3 is insert-molded into the synthetic resin grounding portion 5, and the bottom of the grounding portion 5 is formed. Further, the wear-resistant portion 11 is formed to be thicker than the other portions.

  According to such a configuration, the grounding portion 5 is made of a synthetic resin to reduce the weight and increase the diameter of the grounding portion, thereby enabling stable grounding. The wear-resistant part 11 is formed at the bottom of the grounding part 5 and is thicker than the other parts, and is effective in the grounding body A made of a synthetic resin that is easily worn with the rope cutter 7. .

In the invention according to claim 3 , the mounting plate 3 is press-molded to form a step, and by the step, the annular portion 34 is formed higher than the others at the outer peripheral upper edge portion of the mounting plate 3, and the top surface of the annular portion 34. The rotary blade mounting surface 8 is formed in the annular portion 34, the through holes 17 are formed in the annular portion 34 at intervals in the circumferential direction, and the synthetic resin portion 35 of the grounding portion 5 is introduced into the through hole 17. A contact rib 36 that protrudes so as to connect the through-hole 17 in the circumferential direction is formed in an intermediate portion in the radial direction of 8.

According to such a configuration, the contact rib 36 protruding from the rotary blade attachment surface 8 is formed in the circumferential direction at the radial intermediate portion of the annular rotary blade attachment surface 8. Although it is formed in a substantially annular shape even though it is divided by the synthetic resin portion 35, when the mounting plate 3 is press-molded to form a step and the through-hole 17 is punched, the metal plate mounting plate 3 Even if distortion occurs in the rotary blade mounting surface 8, the contact rib 36 that is one step higher than the rotary blade mounting surface 8 and has a substantially annular shape stably contacts the rotary blade 1. The rotary blade 1 can be attached well.
As in the invention according to claim 4, in the brush cutter B which is provided with a grounding member A according to any one of claims 1 to 3, to the advantages of any one of claims 1 to 3 Can do.

  In short, the present invention is easy to use by grounding the brush cutter when cutting grass near obstacles such as near the wall or around trees, safely without a rotating blade like a tip saw touching obstacles, and You can cut as you wish.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1A is a side sectional view of a main part in which the grounding body A is attached to the brush cutter B, FIG. 1B is a partially enlarged sectional view, and FIG. 2 is a perspective view of the brush cutter B.

The brush cutter B inserts the rotating shaft 32 into the hollow main shaft 14, configures a horizontal rotation conducting portion at the lower end of the rotating shaft 32, hangs the driving shaft 2 from the horizontal rotating conducting portion, A rotary blade 1 such as a tip saw is attached so as to be replaceable by fastening means from below. A handle 13 is provided in the middle of the main shaft 14, and an engine 15 is mounted on the upper end portion, and the rotary blade 1 is driven and rotated via the rotating shaft 32, the horizontal rotation conducting portion, and the driving shaft 2 by driving the engine 15. I am doing so. A safety cover 16 is attached to the main shaft 14 and a shoulder strap 12 is provided. The shoulder strap 12 is hung on the shoulder, the handle 13 is held, and the brush cutter B is swung to the left to cut the grass. .
The grounding body A has a mounting plate 3 through which the drive shaft 2 of the brush cutter B is inserted and a recess 4 that accommodates the lower end portion of the drive shaft 2, and has a substantially bowl-shaped outer shape. It is formed with the part 5. The grounding portion 5 is made of a synthetic resin, is light in weight, and has a large diameter to stabilize the grounding. A mounting plate 3 made of a metal plate and having mechanical strength is integrated with the grounding portion 5 by insert molding as a mounting bracket. A plurality of stepped through holes 17 are formed in the mounting plate 3 at intervals in the circumferential direction, and the synthetic resin portion 35 is filled in the through holes 17, so that the mounting plate 3 and the grounding portion 5 The connection strength is sufficient. A wear-resistant part 11 having a thickness larger than the others is formed at the bottom of the grounding part 5. A recess 33 is formed at a distance above the wear-resistant portion 11 in the circumferential direction. When the wear-resistant portion 11 is worn, a through hole communicating with the recess 33 appears at the bottom of the grounding portion 5. By visually recognizing this, the life of the grounding body A can be known.
A through hole 6 is formed on the outer peripheral upper edge of the grounding portion 5. For example, a flexible rope cutter 7 made of synthetic resin (nylon cord using engineering plastic manufactured by Ube Industries) is used as the grounding portion 5. The large-diameter portion 25 inserted from the inside and attached to the end portion of the rope cutter 7 by caulking or the like is used to prevent the removal. The rope cutter 7 can be removed from the grounding portion 5 by pulling the rope cutter 7 from the through-hole 6 with the large-diameter portion 25, and can be removed from the large-diameter portion 25 by inserting the rope cutter 7 through the through-hole 6. The rope cutter 7 can be attached to the grounding body 3 so as to be stopped. The rotation trajectory of the rope cutter 7 is made larger than the rotation trajectory of the rotary blade 1 so that the tip of the rope cutter 7 passes outside the rotary blade 1. The cross section of the rope cutter 7 includes a circle, a triangle, a square, and the like.
A spline shaft portion 18 and a male screw portion 19 are formed on the drive shaft 2 of the brush cutter B. The spline shaft portion 18 of the drive shaft 2 is fitted with a spline hole 20 of a receiving bracket 10 provided as a fixture on the brush cutter B side, and a circular insertion hole 21 of the rotary blade 1 is formed on the boss 22 of the receiving bracket 10. The rotary blade 1 is attached by inserting the through hole 23 of the mounting plate 3 of the grounding body A through the drive shaft 2 and screwing the nut 24 into the male screw portion 19. As the drive shaft 2 rotates, The rotary blade 1 can be driven and rotated.
As described above, the grounding body A is provided with the rope cutter 7 and the rotary blade 1 such as a tip saw and the rope cutter 7 can be used together. The tip of the rope cutter 7 passes outside the rotary blade 1 because it is larger than the trajectory, and the rotary blade 1 such as a tip saw is used as an obstacle D such as a concrete wall or a stone block. The grass near the obstacle D can be safely cut with the flexible rope cutter 7 without being touched.
At this time, the grounding body A attached to the lower surface side of the rotary blade 1 rotates together with the rotary blade 1 and comes into sliding contact with the ground surface E. The rope cutter 7 and the rotary blade 1 are kept at a certain height from the ground surface E. Mowing that holds the shoulder strap 12 on the shoulder, holds the handle 13 and maintains the rope cutter 7 and the rotary blade 1 at a certain height from the ground surface E, and swings the brush cutter B left and right. Work is easy and easy for everyone to do.
As shown in FIG. 4, the mounting plate 3 is press-molded to form a step, and the rotary blade mounting surface 8 for mounting the rotary blade 1 is on the top surface, and the grounding body A is mounted when the rotary blade 1 is removed. The grounding body mounting surface 9 is formed in a lower level with a step. A step is formed by protruding the boss 22 on the metal fitting 10 which is the equipment on the side of the brush cutter B, and a rotating blade receiving surface 27 for attaching the rotary blade 1 and a grounding body A when the rotary blade 1 is removed are attached. A grounding body receiving surface 28 is formed on the lower surface of the boss 22. By making the outer diameter of the boss 22 equal to the inner diameter F of the annular portion 34 at the outer peripheral upper edge of the mounting plate 3, the outer peripheral surface of the boss 22 contacts the inner peripheral surface 37 of the annular portion 34 over the entire circumference. The centering body A can be centered.
When the rotary blade 1 is attached, the rotary blade 1 is held between the rotary blade receiving surface 27 of the bracket 10 and the rotary blade mounting surface 8 of the mounting plate 3, and the grounding body receiving surface 28 and mounting plate of the bracket 10. A gap G thinner than the thickness of the rotary blade 1 is formed between the three grounding body attachment surfaces 9 (see FIG. 1).
Thus, in the state where the rotary blade 1 is attached, a gap G thinner than the thickness of the rotary blade 1 is formed between the grounding body attachment surface 9 of the mounting plate 3 and the receiving metal fitting 10. When the grounding body A is attached after removing the ground, the grounding body A approaches the receiving metal 10 side by the gap G that is thinner than the thickness of the rotary blade 1, and the grounding body mounting surface 9 of the mounting plate 3 is grounded. The grounding body A provided with the rope cutter 7 can be attached with the rotary blade 1 removed in contact with the body receiving surface 28, so that only the rope cutter 7 can be cut (see FIGS. 3 and 6 (b). )reference). In addition, the grounding body A is removed from the brush cutter B, the rope cutter 7 is removed from the grounding section 5 with the large diameter portion 25, and then the grounding body A is attached to the brush cutter B, so that the mowing with only the rotary blade 1 can be performed. (See FIG. 6C).

  As described above, it is possible to select to use the rotary blade 1 and the rope cutter 7 in combination, to use only the rope cutter 7, or to use only the rotary blade 1, and to use them properly depending on the situation.

  As shown in FIG. 4, the mounting plate 3 is press-molded to form a step, and the annular portion 34 is formed higher than the others on the upper peripheral edge of the mounting plate 3 by the step. A rotary blade mounting surface 8 is formed on the upper surface of the annular portion 34. The through-hole 17 is formed in the annular part 34 at intervals in the circumferential direction. The hole edge of the through hole 17 and the upper outer edge of the annular portion 34 are chamfered to form a taper 38, and the synthetic resin wraps around the taper 38 to increase the bonding strength between the mounting plate 3 and the grounding portion 5. The mounting plate 3 is prevented from being removed. An abutting rib 36 is formed in the middle portion in the radial direction of the annular rotary blade mounting surface 8 so as to connect the through hole 17 in the circumferential direction. The height of the contact rib 36 is about 0.02 mm, but can be changed as appropriate. A synthetic resin portion 35 of the grounding portion 5 is introduced into the through hole 17, and the upper surface of the introduced synthetic resin portion 35 is substantially flush with the rotary blade mounting surface 8.

  In this manner, the contact ribs 36 are formed at the intermediate portion in the radial direction of the annular rotary blade mounting surface 8 so as to connect the through holes 17 formed in the annular portion 34 at intervals in the circumferential direction. The height of the abutment rib 36 is lowered between the arcuate abutment ribs 36, 36, and the top surface of the synthetic resin portion 35 that is substantially flush with the rotary blade mounting surface 8 exists. In this way, the contact rib 36 is formed in a substantially annular shape although it is divided in the circumferential direction, so that the mounting plate 3 is press-molded to form a step and the through hole 17 is punched. Even if the metal plate mounting plate 3 is distorted and the rotary blade mounting surface 8 is also distorted, the contact rib is one step higher than the rotary blade mounting surface 8 and is substantially annular. 36 can stably come into contact with the rotary blade 1, and the rotary blade 1 can be mounted well. It can be carried out in.

  By the way, the rope cutter 7 is more easily worn than the rotary blade 1 such as a tip saw, and needs to be replaced because the tip portion is scattered. It is desirable that the rope cutter 7 can be easily replaced. FIG. 7 shows an embodiment in which replacement can be easily performed. In FIG. 7A, the grounding portion 5 has a width L smaller than the large diameter portion 25 of the rope cutter 7 and larger than the rope diameter of the rope cutter 7. An elongated hole 29 is formed, a through hole 6 larger than the large diameter portion 25 is formed at the lower end of the L-shaped elongated hole 29, and the rope cutter 7 is connected to the grounding portion 5 while the grounding body A is attached to the brush cutter B. It is designed to be removable. In this case, the horizontal elongated hole 30 of the L-shaped elongated hole 29 is formed longer than the upper end of the elongated elongated hole in the direction opposite to the rotating direction of the rotary blade 1 so that the rope cutter 7 cannot be removed during the operation. Instead of the L-shaped long hole 29, only the horizontal long hole 30 or a slanted long hole can be used. In FIG. 7B, a through hole 6 is also formed above the wear-resistant portion 11 so that the rope cutter 7 can be replaced from the recess 4 of the grounding portion 5. In this way, various configurations can be changed in the configuration in which the rope cutter 7 can be replaced from the outside of the grounding body A.

  In the embodiment of the grounding body A described above, the metal plate mounting plate 3 is insert-molded on the synthetic resin grounding body 5. As another embodiment of the grounding body A, the grounding body 5 and the mounting plate 3 are formed separately, and the composite is formed in the through hole 17 of the mounting plate 3 so as to protrude in advance to the grounding body 5, for example. The resin portion 35 may be inserted to connect the grounding body 5 and the mounting plate 3 together. The form of connection between the grounding body 5 and the mounting plate 3 can be changed without departing from the spirit of the present invention.

1 shows an embodiment of the present invention, in which (a) is a side sectional view of a main part in which a grounding body is attached to a brush cutter, and (b) is a partially enlarged sectional view. It is a perspective view of a brush cutter same as the above. It is side sectional drawing of the principal part which shows the usage pattern which removes a rotary blade same as the above and performs brushing with a rope cutter. The same mounting plate is shown, (a) is a plan view, and (b) is a sectional view. The grounding body same as the above is shown, (a) is a perspective view from below, and (b) is a perspective view from above. It is explanatory drawing of various use forms same as the above, (a) is a use form which uses a rotary blade and a rope cutter together, (b) is a use form which removes a rotary blade and performs cutting with a rope cutter, (c) is It is explanatory drawing which shows the usage pattern which removes a rope cutter and performs cutting with a rotary blade. Other embodiment same as the above is shown, and (a) and (b) are explanatory views showing a configuration in which the rope cutter can be attached and detached without removing the grounding body.

Explanation of symbols

A Grounding body B Brush cutter E Ground surface 1 Rotating blade 7 Rope cutter

Claims (4)

A grounding body of a brush cutter, which is attached to the lower surface of a metal fitting attached to a drive shaft of a brush cutter and includes a rotary blade and a rope cutter ,
A mounting plate to which the drive shaft of the brush cutter is inserted and attached, and a grounding portion that is formed with a recess for accommodating the lower end portion of the drive shaft and has a substantially bowl shape, are integrally coupled. ,
On the mounting plate, through a step, a rotary blade mounting surface for mounting the rotary blade and a grounding body mounting surface for mounting the grounding body when the rotary blade is removed,
With the rotary blade attached,
Provided so that the rotary blade mounting surface of the mounting plate is in contact with the lower surface of the rotary blade, and a gap thinner than the thickness of the rotary blade is formed between the grounding body mounting surface of the mounting plate and the lower surface of the receiving bracket. ,
With the rotating blade removed,
Provide the grounding body mounting surface of the mounting plate so that it contacts the lower surface of the receiving bracket,
As the distal end portion of the rope cutter when the rotary blade and the rope cutter are both mounted to pass through the outer side than the rotary blade, the <br/> to be greater than the rotational locus of the rotary blades of the rotary trajectory of the rope cutter The grounding body of the brush cutter. The mounting plate is made of metal, the grounding part is made of synthetic resin, the metal mounting plate is insert-molded in the synthetic resin grounding part, and the wear-resistant part that is thicker than other parts is formed at the bottom of the grounding part. 2. The grounding body of a brush cutter according to claim 1, wherein the grounding body is a brush cutter. The mounting plate is press-molded to form a step, and by this step, an annular portion is formed higher than the others on the outer peripheral edge of the mounting plate, a rotary blade mounting surface is formed on the upper surface of the annular portion, and the annular portion is A through-hole is formed at intervals in the direction, a synthetic resin portion of the grounding portion is introduced into the through-hole, and a projecting portion is formed so as to connect the through-hole in the circumferential direction to the intermediate portion in the radial direction of the annular rotary blade mounting surface. The grounding body of a brush cutter according to claim 2, wherein a contact rib is formed. A brush cutter comprising the grounding member according to any one of claims 1 to 3.

Images