JP2024054662A - Plastic cord attachment tool and grass trimmer equipped with same - Google Patents

Abstract

[Problem] Instead of replacing the rotary blade itself, the same circular rotary blade can be easily changed to a circular rotary blade or a plastic cord type rotary blade depending on the grass cutting purpose. [Solution] The jig J1 has a mounting base 11 and a stopper 12, and the mounting base 11 is inserted into a hole 100 in the rotary blade C and fixed by the stopper 12, and a plastic cord S is attached to the plastic cord insertion part 112 of the mounting base 11. [Selected drawing] Figure 3

Description

The present invention relates to a plastic cord attachment tool used to attach a plastic cord to the rotary blade of a lawnmower, and to a lawnmower equipped with the same.

Grass cutters are generally used to remove weeds that grow in fields, rice paddies, gardens, construction sites, and other construction sites. These grass cutters are also called brush cutters.

As described in Patent Documents 1 and 2, this type of grass cutter is configured with an engine or electric prime mover, an operating stick that extends from the prime mover and incorporates a transmission shaft operatively connected to the prime mover, an operating unit that is disposed on the operating stick and operates the prime mover, a gear case that is provided at the tip of the operating stick and has a gear mechanism operatively connected to the transmission shaft, a rotating shaft operatively connected to the gear mechanism and protruding from the gear case, and a rotating blade rotatably attached to the rotating shaft. In this way, the worker holds the operating stick in his hand and controls the prime mover with the operating unit to rotate the rotating blade, while swinging the operating stick left and right to move the rotating blade left and right along the ground, thereby performing grass cutting work.

In addition, the rotary blade of the grass cutter is prepared in a circular steel type as described in Patent Document 1, and in a plastic cord type (nylon cord type) made of a plastic (nylon) cord as described in Patent Document 2. The circular type (hereinafter referred to as the circular rotary blade) is made of a disk-shaped plate as a whole, and a plurality of blades are formed in a sawtooth shape on the circumference of the circle, so that the circular peripheral blade rotates by the rotation of the rotary blade. In addition, some circular rotary blades have holes to reduce the weight of the rotary blade and increase the rotation efficiency. In the hole type, a plurality of holes are drilled in various shapes, such as a plurality of holes drilled radially from the periphery of a central mounting hole to the circumference of the disk-shaped plate. In the plastic cord type (hereinafter referred to as the plastic cord type rotary blade), a plurality of plastic cords (plastic cord-like things) are fixed to the center of the rotary blade and are extended radially outward from the rotary blade in the radial direction of the rotary blade, so that each plastic cord rotates in the circumferential direction by the rotation of the rotary blade. These rotary blades are used according to the type of grass, and when mowing the grass, the rotary blade is replaced with one appropriate for the grass to be mowed.
Generally, the rotary blade is fitted onto a rotary shaft, and attached to the rotary shaft by tightening a nut via an attachment. Therefore, when replacing the rotary blade, the nut and attachment are sequentially removed from the rotary shaft, the rotary blade is replaced, the attachment is then reattached to the rotary shaft, and the nut is tightened. This process is repeated every time the rotary blade is replaced.

JP 2002-136208 A JP 2020-178675 A

When cutting grass with a lawnmower, generally, a circular rotary blade or a plastic cord rotary blade is used. Thin, soft grass such as grass is often cut short with a plastic cord rotary blade. Slightly thicker grass such as Japanese silver grass is often cut with a circular rotary blade. When there is a mixture of thin and thick grass, the thicker grass is first cut with the circular rotary blade, and then the thin, soft grass is cut with the plastic cord rotary blade.

However, in actual grass cutting work, replacing the rotary blade depending on the grass is quite a hassle, so grass is often cut with the circular rotary blade still attached to the grass cutter. However, the current situation is that it is difficult to cut thin, soft grass such as grass short with a circular rotary blade. If the work of replacing the rotary blade can be improved, it is believed that the usability of the grass cutter will improve and grass cutting work will become easier.

The object of the present invention is to provide a plastic cord attachment tool that allows a circular blade, particularly a blade with holes, to be easily attached and detached to the blade instead of replacing the blade, and by attaching and detaching the plastic cord, the same circular blade can be easily changed to a circular blade or a plastic cord type blade, improving the usability of the lawnmower and making mowing easy and efficient, and to provide a lawnmower equipped with the plastic cord attachment tool that achieves this.

In order to achieve the above object, the present invention provides
A plastic cord attachment tool used to detachably attach a plastic cord to a rotary blade with a hole that is rotatably attached to the tip of an operating stick of a grass trimmer, comprising:
a mounting base including a plastic cord insertion portion that includes a shaft that can be inserted into a hole formed in the rotary blade, and a flange that protrudes from one end or one end side of the shaft in the outer circumferential direction of the shaft and can be engaged with an edge of the hole, and into which the plastic cord can be inserted while being detachably constrained on the shaft;
a stopper that is detachably attached to the shaft of the mounting base and protrudes outward from an outer circumferential surface of the shaft to prevent the shaft from being inserted into the hole of the circular rotary blade;
Equipped with
the mounting base is inserted into the hole of the rotary blade and fixed by the stopper, and the plastic cord is attached to the plastic cord insertion portion of the mounting base;
The gist of the present invention is as follows.
In this case, it is preferable that the rotary blade has a plurality of holes, and that the mounting bases and stoppers are each paired in pairs, with each mounting base being inserted into two holes arranged radially on the rotary blade and fixed by each stopper, and that a plastic cord be attached across the plastic cord insertion portions of each mounting base arranged radially on the rotary blade.

It is also preferable that each part of the plastic cord attachment jig be embodied as follows.
(1) A through hole is drilled in the outer peripheral surface of the shaft of the mounting base perpendicular to the axis of the shaft, and the stopper is made of wire including a wire, steel wire, pin or rod that can be inserted and locked into the through hole, or can be press-fitted or frictionally engaged.
(2) Instead of the above (1), the stopper may be a donut-shaped plate or block that can be fitted around the shaft by pressure contact.
(3) The plastic cord insertion portion consists of a mounting hole drilled between the outer surfaces of the shafts perpendicular to the axial direction of the shafts, and the mounting hole or the plastic cord or both are formed so that the plastic cord can be press-fitted or frictionally engaged into the mounting hole.
(4) The plastic cord has a circular, angular or twisted cross section, forming an uneven cross section.

In order to achieve the above object, the present invention provides a method for producing a liquid crystal display comprising:
a control stick having a built-in transmission shaft extending from the motor and operatively connected to the motor; an operation unit disposed on the control stick and operating the motor; a gear case provided at the tip of the control stick and having a gear mechanism operatively connected to the transmission shaft; a rotating shaft operatively connected to the gear mechanism and protruding from the gear case; and a rotating blade with a hole rotatably attached to the rotating shaft, wherein the control stick is held in the hand and the rotating blade is rotated by the operation unit while swinging the control stick left and right to perform a grass cutting operation,
The rotary blade is provided with the plastic cord attachment jig.
The gist of the present invention is as follows.

According to the plastic cord attachment jig of the present invention and the grass cutter equipped with the same, the above-mentioned configurations allow the jig to be attached to the blade by inserting the attachment base into the hole of the blade and fixing it with a stopper, utilizing the hole of the blade, and attaching the plastic cord to the plastic cord insertion part of the attachment base. Therefore, instead of replacing the blade, for example, from a circular blade to a plastic cord type blade or vice versa, the hole of the blade can be used to easily attach and detach the plastic cord to the blade, and by attaching and detaching this plastic cord to the blade, for example, the same (common) circular blade can be easily changed to a circular blade or a plastic cord type blade. This type of change improves the usability of the grass cutter, thereby achieving the unique and exceptional effect of the present invention, which allows easy and efficient mowing work.

FIG. 1 is a diagram (front view) showing a configuration of a plastic cord attachment jig according to a first embodiment of the present invention; The configuration of each part of the plastic cord attachment jig, together with the plastic cord, is shown in plan, front, and side views. FIG. 1 shows an example of use of the plastic cord attachment jig, and in particular shows the procedure for attaching the attachment jig to a rotary blade with holes. FIG. 13 is a plan view showing an example of use of the plastic cord attachment jig, in particular showing a state in which multiple plastic cords are attached to a rotary blade with holes via multiple plastic cord attachment jigs. FIG. 13 is a plan view showing the configuration of a rotary blade with holes using the plastic cord attachment jig. FIG. 13 is a plan view showing the structure of a plastic cord that is attached to a rotary blade with holes using the plastic cord attachment jig. FIG. 13 is a front view showing the configuration of a plastic cord attachment jig according to a second embodiment of the present invention; FIG. 1 shows an example of use of the plastic cord attachment jig, and in particular shows the procedure for attaching the attachment jig to a rotary blade with holes. FIG. 13 is a plan view showing an example of use of the plastic cord attachment jig, in particular showing a state in which a plastic cord is attached to a rotary blade with a hole via the plastic cord attachment jig. FIG. 13 is a perspective view showing a grass cutter with the plastic cord attachment jig attached to a rotary blade. FIG. 13 is a perspective view showing a grass cutter in a state in which the plastic cord attachment jig is attached to a rotary blade and a plastic cord is attached by the attachment jig.

Next, an embodiment of the present invention will be described with reference to the drawings.
1 and 2 show a first embodiment of the present invention.
As shown in FIG. 1, the plastic cord attachment jig J1 (hereinafter referred to as the jig J1) is
This tool is used to detachably attach a plastic cord to a circular rotary blade with a hole rotatably attached to the tip of an operating stick of a grass cutter, and is composed of an attachment base 11 and a stopper 12.

The circular rotary blade with holes is generally known, and as shown in FIG. 5, the circular rotary blade C is made of a disk-shaped plate as a whole, and a mounting hole 10 is formed in the center of the disk-shaped plate so that it can be inserted into the rotating shaft of the grass cutter, and a plurality of blades 101 are formed in a sawtooth shape on the outer periphery of the circle, so that the blades 101 on the outer periphery are rotated by the rotation of the rotary blade C. The circular rotary blade C is also made of holes, and a plurality of circular holes 100 are drilled radially (in an arrangement) from the entire periphery of the mounting hole 10 in the center of the disk-shaped plate to the outer periphery. The plastic cord S is generally known, and as shown in FIG. 6, it is made of plastic such as nylon and is formed in a string shape having a predetermined length longer than the radius of the rotary blade C. In this case, the plastic cord S may be a string shape with a circular or square cross section, or a string shape formed in a so-called twisted shape to form a cross-sectional uneven shape, with the base end or a part of the base end side processed to a large diameter, and a stopper provided at the base end or a part of the base end. Here, as shown in Figure 6, a plastic cord S is used that is twisted and has a stopper at the base end.

As shown in Figures 1 and 2, the mounting base 11 of the jig J1 comprises a shaft 111 that can be inserted into a hole drilled in a circular rotary blade, and a flange 114 that protrudes from one end or one side of the shaft 111 in the outer circumferential direction of the shaft 111 and can be engaged with the edge of the hole, and has a plastic cord insertion section 112 that can be inserted into the shaft 111 while restraining it to an extent that it can be detached.

In this case, the mounting base 11 is made of plastic and is integrally formed with a cross section that is approximately hat-shaped, and is composed of a prismatic or cylindrical shaft 111 and a circular or rectangular plate-like flange 114 at one end of the shaft 111. Here, the shaft 111 is formed with a square cross section, particularly a rectangular cross section in this case, so that it can be inserted into the circular hole of the rotary blade. The cross section of the shaft 111 may be formed to be within the area of the hole, that is, approximately the same as the area of the hole or slightly smaller than the area of the hole, so that it can be inserted into the hole, or conversely, the cross section of the shaft 111 may be formed to be slightly larger than the area of the hole so that it can be pressed into the hole. The flange 114 is formed in a circular or rectangular plate shape larger than the diameter of the hole so that it can be engaged with the entire periphery of the circular hole of the rotary blade. Here, the flange 114 is formed in a circular plate shape.

The plastic cord insertion portion 112 of the shaft 111 is formed by drilling between the outer peripheral surfaces of the shaft 111 perpendicular to the axial direction of the shaft 111, and serves as an attachment hole. In this case, the plastic cord insertion portion 112 is drilled in a circular shape between the outer peripheral surfaces of the shaft 111 perpendicular to the axial center of the shaft 111, in this case, between the planes forming the short sides of the shaft 111, at a position slightly closer to the tip side than the center, and both ends are opened in a circular shape of the same diameter on the outer peripheral surface of the shaft 111, in this case, the planes forming the short sides of the shaft 111. In this case, the inner diameter of the plastic cord insertion portion 112 is formed to be the same diameter as or slightly smaller than the outer diameter of the plastic cord so that the plastic cord can be press-fitted or frictionally engaged. Here, the inner diameter of the plastic cord insertion portion 112 is slightly smaller than the outer diameter of the twisted shape of the plastic cord. The plastic cord insertion portion 112 may be a square hole. In this case, the shaft 111 is made of plastic, so by making the shaft 111 out of a material that can frictionally engage with the plastic cord, the plastic cord insertion part 112 and the plastic cord can be frictionally engaged. In this way, the plastic cord insertion part 112 only needs to be formed so that the mounting hole or the plastic cord, or both, can be press-fitted into the mounting hole or can be frictionally engaged.

In addition, the shaft 111 of the mounting base 11 is provided with a through hole 113 for the stopper 12 described later together with the plastic cord insertion portion 112. The through hole 113 is drilled on the outer circumferential surface of the shaft 111 of the mounting base 11 perpendicular to the axis of the shaft 111. In this case, the through hole 113 is drilled at a position closer to the base end side than the center between the planes forming the long sides of the shaft 111. In this case, the through hole 113 is drilled in a circular shape at an interval of the distance of the thickness of the rotary blade from the flange 114 at the end of the outer circumferential surface of the shaft 111, i.e., at the end on the flange 114 side of each plane forming the long side, and both ends are opened in a circular shape of the same diameter on the outer circumferential surface of the shaft 111, i.e., on each plane forming the long side. Furthermore, in this case, the inner diameter of the through hole 113 is formed to be the same diameter as the outer diameter of the wire forming the stopper 12 described later, or slightly smaller or larger so that the wire can be inserted and locked, or can be pressed in, or can be frictionally engaged. Here, the inner diameter of the through hole 113 is approximately the same as the outer diameter of the wire.

The stopper 12 of the jig J1 is removably attached to the shaft 111 of the mounting base 11 and protrudes outward from the outer periphery of the shaft 111 to prevent the shaft 111 from slipping out of the hole in the circular rotary blade.

The stopper 12 is made of wire, including a steel wire, a pin, or a rod, which can be inserted into, locked, or press-fitted into the through-hole 113 of the shaft 111 or frictionally engaged. In this case, a wire is used for the stopper 12. This wire has a circular cross section, and as described above, its outer diameter is approximately the same as the inner diameter of the through-hole 113 of the shaft 111, and its length is longer than the length of the through-hole 113. If a pin or rod is used for the stopper 12, the diameter of the through-hole may be the same as that of the pin or rod or slightly smaller than that of the pin or rod, or an uneven shape may be formed on the inner circumferential surface of the through-hole, so that the pin or rod can be press-fitted into the through-hole of the shaft. Also, the shaft, pin, or rod may be made of a material capable of frictionally engaging, or a cross-sectional shape (such as an uneven shape) capable of frictionally engaging may be provided between the through-hole of the shaft and the pin or rod, so that the pin or rod can be frictionally engaged with the through-hole of the shaft.

In this way, in this jig J1, the mounting base 11 is inserted into the hole in the rotary blade and fixed with the stopper 12, and a plastic cord is attached to the plastic cord insertion portion 112 of the mounting base 11. As already mentioned, the circular rotary blade used here has multiple holes, and in the case of such a rotary blade, it is preferable to pair the mounting base 11 and the stopper 12, insert each mounting base 11 into two holes arranged radially in the rotary blade, fix them with the stoppers 12, and attach the plastic cord across the plastic cord insertion portions 112 of each mounting base 11 arranged radially in the rotary blade.

3 and 4 show a specific example of how the jig J1 is used with a general grass cutter.
As shown in Figures 3 and 4, in this case, two of the jigs J1 are attached to the circular rotary blade C of the grass cutter in a pair in a radial arrangement, and a plastic cord S is attached to the rotary blade C in the radial direction of the rotary blade C via the pair of jigs J1.

First, as shown in Fig. 3 (1) and (2), a pair of mounting bases 11 are attached to two holes 100 arranged in the radial direction of the rotary blade C. In this case, the shaft 111 of the mounting base 11 is inserted into the hole 100 of the rotary blade C from the back side of the rotary blade C, and the flange 114 is pressed against the entire periphery of the hole 100. Next, as shown in Fig. 3 (2), a stopper 12 is attached to the shaft 111 protruding onto the surface of the rotary blade C through the hole 100 of the rotary blade C. In this case, since the through hole 113 provided on the outer circumferential surface of the shaft 111 close to the flange 114 is directly above the surface of the rotary blade C, the stopper (wire) 12 is inserted into this through hole 113, both ends of the stopper 12 are protruding from both end openings of this through hole 113, and both ends of the stopper (wire) 12 are bent to engage with the edge portions of both end openings of the through hole 113. This prevents the shaft 111 of the mounting base 11 from slipping out of the hole 100 of the rotary blade C, and the mounting base 11 is fixed to the rotary blade C. In this way, the two mounting bases 11 are attached and fixed to the two holes 100 arranged in the radial direction of the rotary blade C. Then, as shown in FIG. 4, the two pairs of mounting bases 11 are attached to each of the two holes 100 arranged in the radial direction at a predetermined interval around the circumference of the rotary blade C. In this case, five pairs of mounting bases 11 are attached to the rotary blade C.

When attaching the plastic cord S to the rotary blade C, as shown in FIG. 4, the plastic cord S is passed between a pair of mounting bases 11 and is arranged so that the plastic cord S protrudes radially outward from the rotary blade C. In this case, five plastic cords S are attached to the rotary blade C via five pairs of mounting bases 11 in a radial pattern from the center of the rotary blade C toward the outer periphery.

By attaching the jig J1 to the rotary blade C in this way, when using the rotary blade C as a circular rotary blade, the rotary blade C can be used as is, and when changing the circular rotary blade C to a plastic cord type rotary blade, a plastic cord S can be attached to the circular rotary blade C via the jig J1. In this case, as shown in FIG. 2, the plastic cord S is simply inserted into the plastic cord insertion portion 112 of the mounting base 11 until the stopper of the plastic cord S abuts against the insertion end side edge of the plastic cord insertion portion 112, so that the circular rotary blade C can be easily converted to a plastic cord type rotary blade. Conversely, when changing from a plastic cord type rotary blade to a circular rotary blade, the plastic cord S can be removed from the jig J1. In this case, the plastic cord S is simply pulled out of the plastic cord insertion portion 112 of the mounting base 11, so that the circular rotary blade can be easily converted to a plastic cord type rotary blade.

As explained above, with this jig J1, the mounting base 11 is inserted into the hole in the rotary blade and fixed with the stopper 12, and then attached to the rotary blade, and a plastic cord is attached to the plastic cord insertion portion 112 of the mounting base 11. Therefore, instead of replacing the rotary blade itself, the plastic cord can be easily attached and detached to and from the rotary blade using the hole in the rotary blade, and by attaching and detaching this plastic cord to the rotary blade, the same circular rotary blade can be easily changed to a circular rotary blade or a plastic cord type rotary blade. This type of change improves the usability of the lawnmower and makes mowing work much easier and more efficient than before.

In particular, in the present jig J1, a through hole 113 is drilled on the outer peripheral surface of the shaft 111 of the mounting base 11 perpendicular to the axis of the shaft 111, and the stopper 12 is made of wire, including a steel wire, a pin, and a rod, which can be inserted and locked into the through hole 113, or can be press-fitted or frictionally engaged, so that the present jig J1 can be easily and securely attached and fixed to the rotary blade with a simple structure, and each part constituting the present jig J1 can be manufactured at low cost. In addition, the plastic cord insertion part 112 of the shaft 111 is made of a mounting hole drilled between the outer peripheral surfaces of the shaft 111 perpendicular to the axial direction of the shaft 111, and this mounting hole or the plastic cord or both are formed so that the plastic cord can be press-fitted or frictionally engaged into the mounting hole, so that the present jig J1 can be easily and securely attached to the present jig J1 with a simple structure, and can be easily removed. In addition, by using a plastic cord that is twisted and has an uneven cross section, the plastic cord can be effectively engaged with the plastic cord insertion part 112 even if the plastic cord insertion part 112 is a simple circular hole, which also simplifies the structure of the mounting base 11.

Figure 7 shows a second embodiment of the present invention. In this embodiment, the method of attaching and fixing the mounting base 11 to the rotary blade is different from that of the first embodiment.

As shown in FIG. 7, this plastic cord attachment jig J2 (hereinafter referred to as this jig J2) is configured with an attachment base 11 and a stopper 12, similar to the first embodiment.

The mounting base 11 of the jig J2 comprises a shaft 111 that can be inserted into a hole drilled in a circular rotary blade, and a flange 114 that protrudes from one end or one side of the shaft 111 in the outer circumferential direction of the shaft 111 and can be engaged with the edge of the hole, and has a plastic cord insertion section 112 that can be inserted into the shaft 111 while restraining it to an extent that it can be detached.

In this case, the mounting base 11 is integrally formed from plastic with a roughly hat-shaped cross section, and is composed of a prismatic or cylindrical shaft 111 and a circular or square plate-like flange 114 at one end of the shaft 111. Here, the shaft 111 is formed with a circular cross section so that it can be inserted into the circular hole of the rotary blade. The shaft 111 may be formed so that the outer diameter of the shaft 111 is roughly the same as or slightly smaller than the inner diameter of the hole so that it can be inserted into the hole, or conversely, the outer diameter of the shaft 111 may be formed so that it is slightly larger than the inner diameter of the hole so that it can be press-fitted into the hole. The flange 114 is formed in the shape of a circular or square plate larger than the diameter of the hole so that it can be engaged with the entire periphery of the circular rotary blade hole. Here, the flange 114 is formed in the shape of a circular plate.

The plastic cord insertion portion 112 of the shaft 111 is formed by drilling a hole between the outer circumferential surfaces of the shaft 111 perpendicular to the axial direction of the shaft 111, and serves as an attachment hole. In this case, the plastic cord insertion portion 112 is drilled in a circular shape between the outer circumferential surfaces of the shaft 111 perpendicular to the axis of the shaft 111, and both ends are opened in a circular shape of the same diameter on the outer circumferential surface of the shaft 111. In this case, the plastic cord insertion portion 112 is formed with an inner diameter equal to or slightly smaller than the outer diameter of the plastic cord so that the plastic cord can be press-fitted or frictionally engaged. Here, the inner diameter of the plastic cord insertion portion 112 is slightly smaller than the outer diameter of the twisted shape of the plastic cord. In this case, since the shaft 111 is formed from plastic, the shaft 111 can be formed from a material capable of frictionally engaging with the plastic cord, so that the plastic cord insertion portion 112 and the plastic cord can be frictionally engaged. In this way, the plastic cord insertion portion 112 may be formed with an attachment hole or a plastic cord, or both, so that the plastic cord can be press-fitted or frictionally engaged into the attachment hole. The plastic cord insertion portion 112 may be a rectangular hole.
This shaft 111 does not have a through hole (113) as in the first embodiment.

The stopper 12 of the jig J2 is removably attached to the shaft 111 of the mounting base 11 and protrudes outward from the outer periphery of the shaft 111 to prevent the shaft 111 from slipping out of the hole in the circular rotary blade.

The stopper 12 is made of a doughnut-shaped plate or block that can be pressed around the shaft 111 and fitted externally. In this case, the stopper 12 is a doughnut-shaped circular plate, made of a disk-shaped plate, and has a circular hole 120 in the center that can be pressed into or frictionally engaged with the shaft 111 of the mounting base 11. Here, the central hole 120 of the stopper 12 has an uneven inner periphery formed to allow the shaft 111 to be pressed into the hole 120, and an uneven portion (not shown) is provided on the inner periphery of the hole 120. Note that in the case of this stopper 12, the plate can be made of a material that can be frictionally engaged with the shaft 111, or the inner periphery of the hole 120 can be given a shape that can be frictionally engaged, so that the shaft 111 can be frictionally engaged with the hole 120. The stopper 12 may also be formed in a block shape, in which case the stopper 12 may be provided with a plastic cord insertion portion that can communicate with the plastic cord insertion portion 112 of the shaft 111.

In this way, in this jig J2, the mounting base 11 is inserted into the hole in the rotary blade and fixed with the stopper 12, and a plastic cord is attached to the plastic cord insertion portion 112 of the mounting base 11. As already mentioned, the circular rotary blade used here has multiple holes, and in the case of such a rotary blade, it is preferable to pair the mounting base 11 and the stopper 12, insert each mounting base 11 into two holes arranged radially in the rotary blade, fix them with the stoppers 12, and attach a plastic cord across the plastic cord insertion portions 112 of each mounting base 11 arranged radially in the rotary blade.

8 and 9 show a specific example of how the jig J2 is used with a general grass cutter.
As shown in Figures 8 and 9, in this case, two of the jigs J2 are attached to the rotary blade C of the grass cutter in a pair in a radial direction of the rotary blade C, and a plastic cord S is attached to the rotary blade C in the radial direction of the rotary blade C via the pair of jigs J2.

First, as shown in FIG. 8, a pair of mounting bases 11 are attached to two holes 100 arranged in the radial direction of the rotary blade C. In this case, the shaft 111 of the mounting base 11 is inserted into the hole 100 of the rotary blade C from the back side of the rotary blade C, and the flange 114 is pressed against the entire periphery of the hole 100. Next, the stopper 12 is attached to the shaft 111 protruding from the surface of the rotary blade C through the hole 100 of the rotary blade C. In this case, the shaft 111 is passed through the hole 120 in the center of the stopper 12, the stopper 12 is fitted around the shaft 111, and the stopper 12 is slid along the outer circumferential surface of the shaft 111 to be pressed against the surface of the rotary blade C. As a result, the stopper 12 is pressed against the surface of the rotary blade C and fixed to the circumferential surface of the shaft 111, the shaft 111 is prevented from coming off from the hole 100 of the rotary blade C, and the mounting base 11 is fixed to the rotary blade C. In this way, as shown in FIG. 9, two mounting bases 11 are attached and fixed to two holes 100 arranged in the radial direction of the rotary blade C. Then, these pairs of mounting bases 11 are attached to each of two holes 100 arranged in the radial direction at a predetermined interval around the circumference of the rotary blade C. In this case, five pairs of mounting bases 11 are attached to the rotary blade C.

When attaching the plastic cord S to the rotary blade C, as shown in FIG. 9, the plastic cord S is passed between a pair of mounting bases 11 and is arranged so that the plastic cord S protrudes radially outward from the rotary blade C. In this case, five plastic cords S are attached to the rotary blade C via five pairs of mounting bases 11 in a radial pattern from the center of the rotary blade C toward the outer periphery.

By attaching the jig J2 to the rotary blade C in this way, when the rotary blade C is used as a circular rotary blade, the rotary blade C can be used as is, and when the circular rotary blade C is changed to a plastic cord type rotary blade, the plastic cord S can be attached to the circular rotary blade C via the jig J2. In this case, the plastic cord S is simply inserted into the plastic cord insertion portion 112 of the mounting base 11 until the stopper of the plastic cord S abuts against the insertion side edge of the plastic cord insertion portion 112, so that the circular rotary blade C can be easily changed to a plastic cord type rotary blade. Conversely, when changing from a plastic cord type rotary blade to a circular rotary blade, the plastic cord S can be removed from the jig J2. In this case, the plastic cord S is simply pulled out from the plastic cord insertion portion 112 of the mounting base 11, so that the circular rotary blade can be easily changed to a plastic cord type rotary blade.

In this way, the same effect as in the first embodiment can be achieved.

In addition, in the present jig J2, the stopper 12 is particularly made of a donut-shaped plate or block that can be pressed around the shaft 111 and fitted externally, so the present jig J2 has a simple structure and can be easily and securely attached and fixed to the rotary blade, and each part that constitutes the present jig J2 can be manufactured at low cost.

10 and 11 show a grass cutter equipped with the jigs J1 and J2 as a third embodiment of the present invention.
As shown in Figures 10 and 11, each of the grass mowers M comprises a prime mover a, an operating stick c which extends from the prime mover a and incorporates a transmission shaft b operatively connected to the prime mover a, an operating unit d which is arranged on the operating stick c and operates the prime mover a, a gear case e which is provided at the tip of the operating stick c and has a gear mechanism operatively connected to the transmission shaft b, a rotating shaft (not shown) which is operatively connected to the gear mechanism and protrudes from the gear case e, and a rotating blade C with a hole which is rotatably attached to this rotating shaft, and the person performing the work of mowing holds the operating stick c in his/her hand and uses the operating unit d to rotate the rotating blade C while swinging the operating stick d left and right to perform the work of mowing the grass.

The jigs J1 and J2 are provided on the rotary blade C with holes of this mower M. In this case, the jigs J1 and J2 may be attached to the rotary blade C in advance, or may be attached to the mower M as an accessory for retrofitting.

In this way, as already mentioned, in this lawnmower M, the circular rotary blade can be easily changed to a plastic cord type rotary blade, and vice versa.

In the above embodiments, a circular rotary blade is exemplified as a rotary blade with holes, but in addition to circular rotary blades, there are various types of rotary blades with holes that are basically circular. Even with such rotary blades, the tool can be used in the same way as in the above embodiments by utilizing the holes in the rotary blade, and the same effects as in the above embodiments can be achieved.

J1 Plastic cord attachment jig (main jig)
11 Mounting base 111 Shaft 112 Plastic cord insertion part (mounting hole)
113 Through hole 114 Flange 12 Stopper J2 Plastic cord attachment jig (main jig)
11 Mounting base 111 Shaft 112 Plastic cord insertion part (mounting hole)
114 Flange 12 Stopper 120 Hole M Grass trimmer a Prime mover b Transmission shaft c Operating rod d Operating part e Gear case C (circular) rotary blade with hole 10 Mounting hole 100 Hole 101 Blade S Plastic cord

Claims (7)

A plastic cord attachment tool used to detachably attach a plastic cord to a rotary blade with a hole that is rotatably attached to the tip of an operating stick of a grass trimmer, comprising:
a mounting base including a plastic cord insertion portion that includes a shaft that can be inserted into a hole formed in the rotary blade, and a flange that protrudes from one end or one end side of the shaft in the outer circumferential direction of the shaft and can be engaged with an edge of the hole, and into which the plastic cord can be inserted while being detachably constrained on the shaft;
a stopper that is detachably attached to the shaft of the mounting base and protrudes outward from an outer circumferential surface of the shaft to prevent the shaft from being inserted into the hole of the circular rotary blade;
Equipped with
the mounting base is inserted into the hole of the rotary blade and fixed by the stopper, and the plastic cord is attached to the plastic cord insertion portion of the mounting base;
A plastic cord attachment jig. The plastic cord attachment jig according to claim 1, in which the rotary blade has multiple holes, the attachment bases and stoppers are each paired in pairs, the attachment bases are inserted into two holes arranged radially on the rotary blade, and are fixed by the stoppers, and a plastic cord is attached across the plastic cord attachment parts of the attachment bases arranged radially on the rotary blade. The plastic cord attachment jig according to claim 1 or 2, in which a through hole is drilled in the outer circumferential surface of the shaft of the attachment base perpendicular to the axis of the shaft, and the stopper is made of a wire material including a wire, steel wire, pin, or rod that can be inserted and locked into, or can be press-fitted into, or can be frictionally engaged with, the through hole. The plastic cord attachment jig according to claim 1 or 2, wherein the stopper is a doughnut-shaped plate or block that can be pressed and fitted around the shaft. The plastic cord attachment jig according to claim 1 or 2, wherein the plastic cord insertion portion is a mounting hole drilled between the outer circumferential surfaces of the shafts perpendicular to the axial direction of the shafts, and the mounting hole or the plastic cord or both are formed so that the plastic cord can be press-fitted or frictionally engaged into the mounting hole. The plastic cord attachment jig according to claim 1 or 2, wherein the plastic cord has a circular, angular or twisted cross section with an uneven cross section. a control stick having a built-in transmission shaft extending from the motor and operatively connected to the motor; an operation unit disposed on the control stick and operating the motor; a gear case provided at the tip of the control stick and having a gear mechanism operatively connected to the transmission shaft; a rotating shaft operatively connected to the gear mechanism and protruding from the gear case; and a rotating blade with a hole rotatably attached to the rotating shaft, wherein the control stick is held in the hand and the rotating blade is rotated by the operation unit while swinging the control stick left and right to perform a grass cutting operation,
The rotary blade is provided with the plastic cord attachment jig according to claim 1 or 2.
A lawnmower characterized by:

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