JP6788466B2 - Weeding blades used in electric weeders and electric weeders - Google Patents

Description

The present invention relates to an electric weeder and a weeding blade used in the electric weeder.

Conventionally, a weeding machine for digging up soil and removing grass by swinging the front end of the weeding blade has been known. For example, Patent Document 1 below includes a weeding piece having a blade portion whose front end is formed so as to be pushable into the soil, and a driving means for driving the weeding piece, and the weeding piece is provided by the driving means. A weeding machine is disclosed in which the front end of the blade portion is provided so as to be swingable back and forth. According to this weeding machine, by providing a weeding piece whose front end of the blade can swing back and forth by a driving means, each grass can be accurately removed one by one, and the entire area is covered. The grass can be removed continuously and efficiently, and since this weeder swings the front end of the blade to remove the grass, it affects the type of grass and the place where the grass grows as before. It is said that the efficiency of the work can be improved as a result of being able to carry out the work continuously without interrupting the work.

Japanese Unexamined Patent Publication No. 11-168934

However, the weeding machine described in Patent Document 1 described above has a configuration in which the blade portion is pushed diagonally with respect to the ground. Therefore, in this conventional weeding machine, there is a problem that it takes a very long time to continuously weed a wide surface. Further, in this conventional weeding machine, since it is necessary to insert the cutting edge deep into the ground, a certain amount of power of the motor is required, and there is a problem that the motor becomes large. Furthermore, this conventional weeder is not suitable for weeding without digging up the soil.

Further, in the weeding machine described in Patent Document 1, since the blade portion is arranged above the lower surface of the main body, it is expected that the lower surface of the main body will hit the ground during work and the operability will be poor. It can be said that the structure is such that sand and dust easily enter the main body from the base of the blade.

The present invention has been made for the purpose of providing an electric weeding machine that solves the above-mentioned various problems existing in the prior art and a weeding blade used for the electric weeding machine. That is, the electric weeder and the weeding blade used in the electric weeder according to the present invention can efficiently work on a wide area, do not need to increase the size of the motor, and are suitable even in a place where soil is not to be dug up. It is an object of the invention to provide an electric weeding machine that can be used, has excellent workability, and does not allow dirt, sand, dust, etc. to enter the main body, and a weeding blade used for this electric weeding machine.

The electric weeding machine according to the present invention includes a motor as a power source, a driving force conversion mechanism for converting rotational driving force from the motor into reciprocating driving force in the front-rear direction, and at least the motor and the driving force conversion mechanism. An electric weeding machine including a housing to be stored and a weeding blade that reciprocates back and forth by a reciprocating driving force obtained from the driving force conversion mechanism, and the weeding blade is provided so as to project toward the front of the housing. It is configured to have one flat blade portion, and when the direction orthogonal to the front-rear direction is the left-right direction in the plan view of the blade portion, the blade portion extends in the front-rear direction. It has a long portion and a plurality of working blades projecting in a comb-teeth shape in both the left and right directions of the long portion, and the long portion has a tip shape at the front end. The length of the front end of the tip shape in the left-right direction is shorter than the length of the rear end of the tip shape in the left-right direction .

Further, in the electric weeder according to the present invention, the tip shape can be located on a straight line passing through the center of the long portion along the front-rear direction.

Further, in the electric weeding machine according to the present invention, the plurality of working blades of the weeding blade can be configured to be located below the lower surface of the housing.

Furthermore, in the electric weeding machine according to the present invention, it is preferable that the weeding blade is configured to have flexibility.

The weeding blade according to the present invention houses a motor as a power source, a driving force conversion mechanism that converts a rotational driving force from the motor into a reciprocating driving force in the front-rear direction, and at least the motor and the driving force conversion mechanism. A weeding blade for an electric weeding machine, which is used in an electric weeding machine including a housing and moves back and forth by a reciprocating driving force obtained from the driving force conversion mechanism, and is provided so as to project toward the front of the housing. It is configured to have one flat blade portion to be formed, and when the direction orthogonal to the front-rear direction is the left-right direction in the plan view of the blade portion, the blade portion is in the front-rear direction. It has a long portion that extends and a plurality of working blades that project in a comb-teeth shape toward both the left and right directions of the long portion, and the long portion has a tip shape at the front end. The length of the front end of the tip shape in the left-right direction is shorter than the length of the rear end of the tip shape in the left-right direction .

Further, in the weeding blade according to the present invention, the tip shape can be located on a straight line passing through the center of the long portion along the front-rear direction.

According to the present invention, it is possible to efficiently work on a wide area, it is not necessary to increase the size of the motor, and it can be suitably used even in a place where you do not want to dig up soil, and it is excellent in workability and inside the main body. It is possible to provide a new electric weeding machine which has an effect that soil, sand, dust and the like are hard to invade, which is not found in the prior art, and a weeding blade which is suitably used for this electric weeding machine.

It is the external perspective view of the electric weeding machine which concerns on 1st Embodiment, and is the figure when the electric weeding machine is seen obliquely forward to the right and from above. It is a vertical sectional side view of the electric weeding machine which concerns on 1st Embodiment. It is sectional drawing which shows the cross section of reference numeral AA in FIG. The figure when the electric weeding machine which concerns on 1st Embodiment is seen from the lower side is shown. It is a figure for demonstrating the constituent members of the electric weeding machine which concerns on 1st Embodiment, the segment (a) in the figure shows the appearance shape of the weeding blade, and the segment (b) is the appearance shape of a counterweight. Is shown. It is a figure which shows the modification of the weeding blade applicable to the electric weeding machine which concerns on 1st Embodiment. It is a figure which shows the modification of the weeding blade applicable to the electric weeding machine which concerns on 1st Embodiment. It is a figure which shows the modification of the weeding blade applicable to the electric weeding machine which concerns on 1st Embodiment. It is a figure which shows the modification of the weeding blade applicable to the electric weeding machine which concerns on 1st Embodiment. It is a figure which shows the modification of the weeding blade applicable to the electric weeding machine which concerns on 1st Embodiment. It is a figure which shows the modification of the weeding blade applicable to the electric weeding machine which concerns on 1st Embodiment. It is a figure which shows the modification of the weeding blade applicable to the electric weeding machine which concerns on 1st Embodiment. It is a top view of the electric weeder which concerns on 2nd Embodiment. It is a vertical sectional side view of the electric weeding machine which concerns on 2nd Embodiment. It is a partial cross-sectional view which showed the main part when the electric weeder which concerns on 2nd Embodiment is seen from the lower side.

Hereinafter, preferred embodiments for carrying out the present invention will be described with reference to the drawings. It should be noted that the following embodiments do not limit the invention according to each claim, and not all combinations of features described in the embodiments are essential for the means for solving the invention. ..

[First Embodiment]
The electric weeder 10 according to the first embodiment will be described with reference to FIGS. 1 to 5. Here, FIG. 1 is an external perspective view of the electric weeder according to the first embodiment, and is a view when the electric weeder is viewed diagonally forward to the right and from above. Further, FIG. 2 is a vertical cross-sectional side view of the electric weeder according to the first embodiment, and FIG. 3 is a cross-sectional view showing a cross section of reference numerals AA in FIG. Further, FIG. 4 shows a view of the electric weeder according to the first embodiment as viewed from below. Note that FIG. 4 depicts a state in which the lower cover constituting the housing 11 is removed in order to explain the internal structure of the electric weeder according to the first embodiment. Further, FIG. 5 is a diagram for explaining the constituent members of the electric weeding machine according to the first embodiment, and the fractional diagram (a) in the diagram shows the external shape of the weeding blade, and the fractional diagram (b) is shown. ) Indicates the appearance shape of the counterweight.

In the first embodiment, for convenience of explanation, the direction of the electric weeder 10 is defined as shown in FIGS. 1 to 4. That is, when the operator grips the electric weeder 10 according to the first embodiment, "front, rear, top, bottom, left, right" is determined based on the direction when viewed from the operator. is there.

As shown in FIGS. 1, 2 and 4, the electric weeder 10 according to the first embodiment reciprocates the motor 12 as a power source and the rotational driving force from the motor 12 in the front-rear direction. The driving force conversion mechanism 20 that converts the force, the housing 11 that houses the motor 12, the driving force conversion mechanism 20, and the like, and the weeding blade 31 that reciprocates back and forth by the reciprocating driving force obtained from the driving force conversion mechanism 20. It is configured to prepare.

As shown in detail in FIGS. 1 and 2, the outer shape of the housing 11 includes a front housing portion 11a for accommodating the motor 12 and an upper housing portion 11b that functions as a grip portion for receiving grip from the operator. It is composed of a lower housing portion 11c for accommodating the driving force conversion mechanism 20 and a rear housing portion 11d on which an electric cord 15 for supplying electric power from an external power source is installed. A trigger switch 13 for operating the motor 12 installed inside the front housing portion 11a is provided on the lower side of the upper housing portion 11b, and the operator can turn on / off the trigger switch 13. By doing so, the motor 12 is started / stopped. Further, in the lower housing portion 11c, an auxiliary handle 11e formed in a substantially inverted U shape toward the front of the housing 11 is installed to improve the operability and safety of the electric weeder 10. There is.

As shown in FIG. 2, the motor 12 has a motor shaft 14 whose axial direction is directed in the vertical direction. A drive gear 14a is formed at the tip of the shaft on the lower side of the motor shaft 14 of the motor 12. A driven gear 24a constituting the driving force conversion mechanism 20 according to the first embodiment meshes with the driving gear 14a. When the electric weeder 10 is viewed from the upper surface side, if the drive gear 14a rotates clockwise, the driven gear 24a rotates counterclockwise.

Two eccentric cams 25a and 25b are attached to the driven shaft 24 to which the driven gear 24a described above is attached. The two eccentric cams 25a and 25b are arranged so as to overlap each other in the vertical direction with respect to the driven shaft 24, and as shown in detail in FIG. 4, the two eccentric cams 25a and 25b are eccentric to each other. It is installed so that the directions differ by 180 degrees. The two eccentric cams 25a and 25b cooperate with the weeding blade 31 and the counter weight 41, which will be described later, to transmit the motor 12 via the motor shaft 14, the drive gear 14a, the driven gear 24a, and the driven shaft 24. It is possible to convert the rotational driving force of the weeding blade 31 into the back-and-forth movement of the weeding blade 31. In the first embodiment, of the two eccentric cams 25a and 25b, the eccentric cam 25a located above acts on the reciprocating motion of the weeding blade 31, and the eccentric cam 25b located below acts on the counter weight 41. It is configured to act on back-and-forth reciprocating motion.

Next, a specific configuration of the weeding blade 31 and the counterweight 41 will be described. First, the weeding blade 31 according to the first embodiment is configured as one flat plate blade as shown in the segment (a) in FIG. 5, and is configured as a flat plate blade portion I. It is a member composed of a driving unit II and a connecting unit III. More specifically, the weeding blade 31 includes a long portion 31a extending in the front-rear direction and a plurality of working blades 31b projecting in a comb-teeth shape from the front portion of the long portion 31a toward both the left and right sides. A cam hole 31c formed as an oval opening at the rear end of the elongated portion 31a, and a guide hole 31d formed as an elongated hole at a position between the plurality of working blades 31b and the cam hole 31c. It is configured to have. Further, a pointed shape 31e is formed at the front tip of the long portion 31a of the weeding blade 31. In the weeding blade 31 according to the first embodiment, the weeding work is performed by allowing the plurality of working blades 31b and the pointed shape 31e to act on the grass or the hairline of the grass.

Further, the cam hole 31c and the guide hole 31d are portions that function as the driving force conversion mechanism 20 according to the first embodiment. As shown in FIGS. 2 and 4, an eccentric cam 25a located above is inserted and installed in the cam hole 31c of the weeding blade 31, and fixedly installed in the housing 11 in the guide hole 31d. The guide shaft 18 is inserted and installed. In such a configuration, when the eccentric cam 25a located above performs an eccentric rotational motion by driving the motor 12, the reciprocating motion in the front-rear direction with respect to the weeding blade 31 is executed by the action of the cam hole 31c. At this time, the reciprocating motion of the weeding blade 31 in the front-rear direction is suitably guided by the action of the guide shaft 18 fixedly installed in the housing 11 and the guide hole 31d, so that the weeding blade 31 is stably reciprocated back and forth. The exercise will be realized.

On the other hand, the counterweight 41 according to the first embodiment is configured as one flat plate weight as shown in the segment (b) in FIG. 5, and is more specific. A short portion 41a extending in the front-rear direction, a guide hole 41d formed as an elongated hole in the front portion of the short portion 41a, and a cam hole formed as an oval opening at the rear end of the short portion 41a. It is a member having 41c and. The counterweight 41 is a member provided for balancing the weight balance with the above-mentioned weeding blade 31 that reciprocates back and forth, and the shape and weight of the counterweight 41 according to the shape and weight of the weeding blade 31. Has been decided.

As for the cam hole 41c and the guide hole 41d, as shown in FIG. 4, an eccentric cam 25b located below is inserted and installed in the cam hole 41c of the counterweight 41, and the housing is inserted in the guide hole 41d. A guide shaft 18 fixedly installed in 11 is inserted and installed. In such a configuration, when the eccentric cam 25b located below performs an eccentric rotational motion by driving the motor 12, the reciprocating motion in the front-rear direction with respect to the counter weight 41 is executed by the action of the cam hole 41c. At this time, the reciprocating motion of the counterweight 41 in the front-rear direction is suitably guided by the action of the guide shaft 18 fixedly installed in the housing 11 and the guide hole 41d, so that the counterweight 41 is stably reciprocated back and forth. The exercise will be realized.

Further, in the above configuration, when the motor 12 is driven by the on operation of the trigger switch 13, the two eccentric cams 25a and 25b rotate by changing their respective phases. Then, due to the action of the two eccentric cams 25a and 25b and the two cam holes 31c and 41c, the weeding blade 31 and the counterweight 41 reciprocate back and forth with a phase difference of 180 degrees from each other. By such an operation by the weeding blade 31 and the counterweight 41, the weight balance of the entire electric weeding machine 10 according to the first embodiment becomes an equilibrium state and becomes stable, and it becomes possible to obtain an effect of improving workability. ..

The weeding blade 31 according to the first embodiment has further superior features. First, as shown in FIGS. 1 and 2, the weeding blade 31 is provided so as to project toward the front of the housing 11, but the long portion 31a constituting the weeding blade 31 has a plurality of working blades. A stepped shape 31f as the connecting portion III is formed in the immediate vicinity on the rear side of the portion where the 31b is formed. That is, in the first embodiment, the plurality of working blades 31b of the weeding blade 31 are configured to be located below the lower surface of the housing 11. By having such a configuration, the electric weeder 10 according to the first embodiment can perform the weeding work by simultaneously hitting the plurality of working blades 31b of the weeding blade 31 against the ground to perform the weeding work. You can work on the area efficiently. Further, even if the plurality of working blades 31b are not deeply inserted into the ground, weeding can be performed by hitting the plurality of working blades 31b parallel to the ground against the grass or the hairline of the grass, so that the working blades 31b can be deeply grounded. It is not necessary to insert the motor, and it is possible to obtain the effect that it is not necessary to increase the size of the motor as in the conventional technique. Further, according to the electric weeder 10 according to the first embodiment, since the weeding work can be performed without digging up the soil, it can be used even in a place where the soil is not to be dug up, and there are few restrictions on the usage environment as compared with the conventional technique. When you want to dig up the soil and remove the grass, you can pinpoint the specific grass by using the pointed shape 31e formed at the front tip of the long portion 31a of the weeding blade 31. it can.

Further, regarding the weeding blade 31 according to the first embodiment, the portion of the weeding blade 31 protruding toward the front of the housing 11 is covered with the upper cover 11f and the lower cover 11g provided in the housing 11, and the inside of the outlet portion thereof. A sponge 19 is installed so as to surround the weeding blade 31. Further, the lower cover 11g extends toward the rear side of the lower surface of the housing 11. With such a configuration, it is possible to prevent sand, dust, and the like from entering the inside from the outlet portion where the weeding blade 31 of the housing 11 projects forward and the lower surface side of the housing 11. In particular, with respect to the electric weeding machine 10 according to the first embodiment, weeding work is performed with the lower surface of the housing 11 and the ground separated from each other due to the effect of the stepped shape 31f as the connecting portion III of the weeding blade 31. Therefore, it is difficult for sand, soil, dust, etc. to enter the housing 11, but it is very expensive by installing the sponge 19 at the place where the weeding blade 31 goes in and out of the housing 11. Dustproof property can be obtained.

Further, the weeding blade 31 according to the first embodiment is made of a flexible member. As described above, the weeding blade 31 according to the first embodiment is configured as one flat plate blade, and the weeding blade 31 is composed of a material such as tool steel or SK material, for example. Therefore, it is configured so that it can be bent while having a predetermined strength. That is, during the weeding work, the reciprocating weeding blade 31 acts on the grass while being allowed to flex appropriately, so that the grass growing in various forms is suitable for the plurality of working blades 31b. Can be caught in. That is, during the weeding work, the front side of the weeding blade 31 is tilted slightly downward so that the tip portion is brought into contact with the ground, and then pushed further downward to bend the weeding blade 31 along the ground. It is easily possible for a plurality of working blades 31b to catch grass that grows in clusters at the same time. That is, it can be said that the electric weeder 10 according to the first embodiment is a device having very good workability.

Regarding the installation interval of the plurality of working blades 31b of the weeding blade 31 according to the first embodiment and the stroke width of the reciprocating motion in the front-rear direction, the distance between adjacent work blades 31b in the front-rear direction is large. , It suffices if it is set smaller than the stroke amount of the reciprocating motion in the front-back direction. For example, in the first embodiment, the tips of a plurality of working blades 31b are formed in a curved shape, but the apex of the curved shape of the tips of a working blade 31b moves from the front to the rear of the reciprocating motion. When this is done, it is configured to have a stroke amount that moves to a position that at least overlaps with the position where the curved apex of the tip of the work blade 31b adjacent to the rear side is located at the front of the reciprocating motion. Just do it. With this configuration, it is possible for the plurality of working blades 31b to reliably catch the grass and perform the weeding work.

Since the electric weeder 10 according to the first embodiment has the above-described configuration, a plurality of working blades 31b of the weeding blade 31 that reciprocates in the front-rear direction are applied in parallel to the ground surface, or the ground surface. It is possible to carry out weeding work by slightly diving from the ground and scraping out the roots of weeds. Further, for example, for a weed that grows only once in the lawn, the weed is removed by piercing the pointed shape 31e of the weeding blade 31 into the soil in the vicinity of the weed, loosening the soil, or cutting the root. It becomes possible to make it easier. That is, according to the electric weeder 10 according to the first embodiment, it is possible to efficiently work on a wide area, it is not necessary to increase the size of the motor, and it is suitably used even in a place where it is not desired to dig up soil. It is possible to provide a new electric weeder that is not available in the prior art and has the effect of being excellent in workability and having the effect of preventing soil, sand, dust, etc. from entering the main body.

The basic configuration of the electric weeder 10 according to the first embodiment has been described above. However, the electric weeding machine of the present invention is not limited to the above-described form, and in particular, any modified form can be adopted for the weeding blade according to the present invention. Therefore, next, by using FIGS. 6 to 12, a modified example of the weeding blade applicable to the electric weeding machine 10 according to the first embodiment described above will be described. Here, FIGS. 6 to 12 are diagrams showing a modified example of the weeding blade applicable to the electric weeding machine according to the first embodiment. Regarding FIGS. 6 to 12, members that are the same as or similar to the members described in the first embodiment described above may be designated by the same reference numerals and description thereof may be omitted.

For example, in the first embodiment described above, the tip portions of the plurality of working blades 31b are formed in a curved shape, and the front tip portion of the long portion 31a is formed in a pointed shape 31e. However, various changes can be made to the shapes of the plurality of working blades 31b and the pointed shape 31e. For example, as shown in FIG. 6, the tip portions of the plurality of working blades 31b can be formed into a linear tapered shape. By doing so, grass roots can be easily cut by the corners formed on both sides of the tip of the working blade 31b. Further, in the case of the working blade 31b shown in FIG. 6, the front corner portion of the tapered shape of the working blade 31b (for example, the portion of reference numeral α) and the working blade 31b adjacent to the rear of the working blade 31b Suitable weeding work can be performed by securing the stroke width by the distance between the taper-shaped front corner portion (for example, the portion of the symbol β). That is, it is possible to obtain an electric weeder 10 capable of weeding work with a smaller stroke width than in the case of the first embodiment described above. Such an effect contributes to the miniaturization of the device and the cost reduction effect. Further, a plurality of pointed shapes 31e may be provided. Alternatively, as shown in FIG. 6, the tip portion of the pointed shape 31e can be formed into a linear tapered shape. By doing so, for example, in work such as removing weeds partially grown in the lawn, it is possible to further improve workability.

Further, as shown in FIG. 7, the plurality of working blades 31b can be tilted rearward by changing the outer angle of the plurality of working blades 31b. By adopting such a shape, for example, with respect to the weeding blade 31 shown in FIG. 7, the grass pulled out by the saw-like shape action can be collected on the front side, that is, on the rear side, so that after weeds are pulled out. It is possible to obtain the effect of facilitating the cleaning work of the saw.

Further, the plurality of working blades 31b have a shape in which a step is provided so that the working blade 31b is located on the lower side with respect to the long portion 31a as shown in FIG. 8, or as shown in FIG. It is possible to adopt a shape that is bent downward so that the working blade 31b is located on the lower side with respect to the long portion 31a. In the case of these shapes, since the long portion 31a does not come into contact with the ground during weeding work, the resistance to the weeding blade 31 becomes small, and even if the ground is uneven, the plurality of working blades 31b reliably remove weeds. You can get the effect of being able to scrape off.

Further, for the plurality of working blades 31b, as shown in FIG. 10, a steel plate having high hardness is attached to the portion of the working blade 31b, or as shown in FIG. 11, the portion of the working blade 31b is polished to have a polished surface. The working blade 31b can be configured by the above. With respect to the working blade 31b adopting these forms, it is possible to perform suitable weeding work in the same manner as the above-mentioned working blade 31b.

Further, in the weeding blade 31 illustrated in the first embodiment, the blade portion I, the driving portion II, and the connecting portion III are composed of one flat plate blade. As shown in FIG. 12, the weeding blade according to the present invention includes, for example, a main body side plate 131a as a driving unit II in which a cam hole 31c that functions the weeding blade 131 as a driving force conversion mechanism 20 is formed, and a plurality of working blades. It is divided into a working side plate 131b as a blade portion I on which 31b is formed, and these main body side plates 131a and the working side plate 131b are connected and connected by a connecting member 132 made of an elastic body as a connecting portion III. It can also be adopted. For the connection between the main body side plate 131a and the work side plate 131b using the connecting member 132, any known connecting means such as those using bolts 133 and nuts 134 can be adopted. By adopting the configuration shown in FIG. 12, for example, even if the working blade 31b is damaged, it is not necessary to replace the entire weeding blade 31, and only the working side plate 131b needs to be replaced, which is cost effective. It is possible to obtain an advantageous effect in terms of maintenance and maintainability. Further, since only the working side plate 131b can be replaced, the thickness of the main body side plate 131a and the working side plate 131b can be easily changed, or the working side plate 131b having a different blade shape can be easily changed. , Versatility can be increased. For example, the durability can be improved by increasing the thickness of the main body side plate 131a in which the cam hole 31c is formed. Therefore, by optimizing the shape of the weeding blade 31, the life is improved and the device performance is improved. It becomes possible to plan. Further, in the embodiment shown in FIG. 12, since the connecting member 132 is made of an elastic body, it is possible to obtain an effect that the vibration transmitted to the operator's hand is reduced and the workability is improved.

The electric weeder 10 according to the first embodiment has been described above. However, the electric weeder of the present invention can be applied to all types of electric tools, and by installing a weeding blade of a form different from that of the first embodiment described above, it can be used as a different type of electric weeder. Can be used. Therefore, as a second embodiment, an example of an embodiment in which the electric weeder according to the present invention is configured as a swing type (hair clipper type) electric weeder will be described.

[Second Embodiment]
The electric weeder 210 according to the second embodiment will be described with reference to FIGS. 13 to 15. Here, FIG. 13 is a top view of the electric weeder according to the second embodiment, and FIG. 14 is a vertical sectional side view of the electric weeder according to the second embodiment. Further, FIG. 15 is a partial cross-sectional view showing a main part when the electric weeder according to the second embodiment is viewed from below.

The second embodiment is also defined as shown in FIGS. 13 and 14 in the direction of the electric weeder 210 for convenience of explanation. That is, when the operator grips the electric weeder 210 according to the second embodiment, "front, rear, top, bottom, left, right" is determined based on the direction when viewed from the operator. is there.

As shown in FIG. 14, the electric weeder 210 according to the second embodiment has a motor 212 as a power source and a drive that converts a rotational driving force from the motor 212 into a swing driving force in the left-right direction. A force conversion mechanism 220, a housing 211 for accommodating these motors 212, a driving force conversion mechanism 220, etc., and a hair clipper-shaped weeding blade 231 that reciprocates in the left-right direction by a swing driving force obtained from the driving force conversion mechanism 220. It is configured with.

As shown in detail in FIGS. 13 and 14, the outer shape of the housing 211 includes a front housing portion 211a for accommodating the motor 212, and an upper housing portion 211b that functions as a grip portion for receiving grip from the operator. It is composed of a lower housing portion 211c that houses the driving force conversion mechanism 220 and a rear housing portion 211d in which an electric cord 215 for supplying electric power from an external power source is installed. A trigger switch 213 for operating the motor 212 installed inside the front housing portion 211a is provided on the lower side of the upper housing portion 211b, and the operator can turn on / off the trigger switch 213. By doing so, the motor 212 is started / stopped.

As shown in FIG. 14, the motor 212 has a motor shaft 214 whose axial direction is directed in the vertical direction. A drive gear 214a is formed at the tip of the shaft on the lower side of the motor shaft 214 of the motor 212. A reduction gear 215a constituting the driving force conversion mechanism 220 according to the second embodiment is meshed with the drive gear 214a, and the reduction gear 215a is provided by an intermediate shaft 215b installed inside and rear of the front housing portion 211a. It is installed so that it can rotate. Further, a driven gear 224a installed in the front meshes with the reduction gear 215a. When the electric weeder 210 is viewed from the upper surface side, when the drive gear 214a rotates clockwise, the reduction gear 215a rotates counterclockwise, and the driven gear 224a rotates clockwise. ..

Two eccentric cams 225a and 225b are rotatably attached to the driven shaft 224 to which the driven gear 224a described above is attached. The two eccentric cams 225a and 225b may be configured as an integral member. The two eccentric cams 225a and 225b are arranged so as to overlap each other in the vertical direction with respect to the driven shaft 224, and as shown in detail in FIG. 15, the two eccentric cams 225a and 225b are eccentric to each other. It is installed so that the directions differ by 180 degrees. These two eccentric cams 225a and 225b are transmitted via the motor shaft 214, the drive gear 214a, the reduction gear 215a, the driven gear 224a and the driven shaft 224 by cooperating with the weeding blade 231 and the counter weight 241 described later. It is possible to convert the rotational driving force of the motor 212 to be left and right swinging motion of the weeding blade 231. In the second embodiment, of the two eccentric cams 225a and 225b, the eccentric cam 225a located above acts on the left-right swinging motion of the weeding blade 231 and the eccentric cam 225b located below acts on the counterweight 241. It is configured to act on the left-right swinging motion of.

Next, a specific configuration of the weeding blade 231 and the counterweight 241 will be described. First, as shown in FIG. 15, the weeding blade 231 according to the second embodiment is configured as one flat plate blade, and has a blade portion I, a drive portion II, and a connecting portion III. It is a member composed of. More specifically, the weeding blade 231 has a plurality of working blades 231b formed in a hair clipper shape on the front side, a cam hole 231c formed as an oval opening on the rear side, and a plurality of cam holes 231c. It is a member having a fulcrum hole 231d formed as a round hole at a position between the working blade 231b and the cam hole 231c.

Further, the cam hole 231c and the fulcrum hole 231d are portions that function as the driving force conversion mechanism 220 according to the second embodiment. As shown in FIG. 15, an eccentric cam 225a located above is inserted and installed in the cam hole 231c of the weeding blade 231, and the fulcrum shaft 218 fixedly installed in the housing 211 is installed in the fulcrum hole 231d. Is inserted and installed. In such a configuration, when the eccentric cam 225a located above performs an eccentric rotational motion by driving the motor 212, the lateral swing motion with respect to the weeding blade 31 is executed by the action of the cam hole 231c. .. At this time, due to the action of the fulcrum shaft 218 fixedly installed in the housing 211 and the fulcrum hole 231d, the weeding blade 231 with the fulcrum shaft 218 and the fulcrum hole 231d as the swing center is swung in the left-right direction. Since it is preferably executed, a stable left-right swinging motion of the weeding blade 231 is realized.

On the other hand, the counterweight 241 according to the second embodiment is configured as a single flat plate weight as shown in FIG. 15, and more specifically, the front portion. It is a member having a fulcrum hole 241d formed as a round hole and a cam hole 241c formed as an oval opening in a rear portion. The counterweight 241 is a member provided for balancing the weight balance with the above-mentioned weeding blade 231 that swings left and right, and the shape of the counterweight 241 and the shape of the counterweight 241 are adjusted according to the shape and weight of the weeding blade 231. The weight has been determined.

Regarding these cam holes 241c and fulcrum holes 241d, an eccentric cam 225b located below is inserted and installed in the cam hole 241c of the counterweight 241 and fixedly installed in the housing 211 in the fulcrum hole 241d. The fulcrum shaft 218 is inserted and installed. In such a configuration, when the eccentric cam 225b located below performs an eccentric rotational motion by driving the motor 212, the swing motion in the left-right direction with respect to the counterweight 241 is executed by the action of the cam hole 241c. .. At this time, due to the action of the fulcrum shaft 218 fixedly installed in the housing 211 and the fulcrum hole 241d, the counterweight 241 swinging around the fulcrum shaft 218 and the fulcrum hole 241d in the left-right direction. Since the guide is preferably guided, a stable left-right swinging motion of the counterweight 241 is realized.

Further, in the above configuration, when the motor 212 is driven by the on operation of the trigger switch 213, the two eccentric cams 225a and 225b rotate by changing their respective phases. Then, due to the action of the two eccentric cams 225a and 225b and the two cam holes 231c and 241c, the weeding blade 231 and the counterweight 241 swing left and right with a phase difference of 180 degrees from each other. By such an operation by the weeding blade 231 and the counterweight 241, the weight balance of the entire electric weeding machine 210 according to the second embodiment becomes equilibrium and stable, and it becomes possible to obtain the effect of improving workability. ..

The weeding blade 231 according to the second embodiment also has a stepped shape 231f as the connecting portion III, and a plurality of hair clipper-shaped working blades 231b of the weeding blade 231 are provided from the lower surface of the housing 211. Is also configured to be located below (see FIG. 14 etc.). By having such a configuration, the electric weeding machine 210 according to the second embodiment can perform the weeding work by applying the plurality of working blades 231b of the weeding blade 231 in parallel to the ground. You can work efficiently over a large area. Further, even if the plurality of working blades 231b are not deeply inserted into the ground, weeding can be performed by hitting the plurality of working blades 231b parallel to the ground against the grass or the hairline of the grass, so that the working blades 231b are deeply placed in the ground. It is not necessary to insert the motor, and it is possible to obtain the effect that it is not necessary to increase the size of the motor as in the conventional technique. Further, according to the electric weeder 210 according to the second embodiment, since the weeding work can be performed without digging up the soil, it can be used even in a place where the soil is not to be dug up, and there are few restrictions on the usage environment as compared with the conventional technique.

As shown in FIG. 14, also in the weeding blade 231 according to the second embodiment, the sponge 219 is installed at the outlet portion protruding toward the front of the housing 211, and the housing 211 and the weeding blade 231 A configuration is adopted that can prevent sand, dust, etc. from entering the housing 211 from the outside. In particular, with respect to the electric weeding machine 210 according to the second embodiment, weeding work is performed with the lower surface of the housing 211 and the ground separated from each other due to the effect of the stepped shape 231f as the connecting portion III of the weeding blade 231. Therefore, it is difficult for sand, soil, dust, etc. to enter the housing 211, but it is very expensive by installing a sponge 219 at the place where the weeding blade 231 goes in and out of the housing 211. Dustproof property can be obtained.

Although the preferred embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the scope described in the above embodiments. Various changes or improvements can be made to the above embodiments.

For example, in the first and second embodiments described above, a configuration example in which counterweights 41,241 are installed in order to balance the weight during operation has been described, but in the electric weeder according to the present invention, the counter is used. It is also possible to omit the weight. Whether or not a counterweight is installed can be arbitrarily selected according to the specifications of the electric weeder, usage conditions, and the like.

It is clear from the description of the claims that such modified or improved forms may also be included in the technical scope of the present invention.

10,210 Electric weeder 11,211 housing, 11a, 211a front housing part, 11b, 211b upper housing part, 11c, 211c lower housing part, 11d, 211d rear housing part, 11e auxiliary handle, 11f upper cover, 11g lower Cover, 12,212 motor, 13,213 trigger switch, 14,214 motor shaft, 14a, 214a drive gear, 15,215 electric cord, 18 guide shaft, 19,219 sponge, 20,220 drive force conversion mechanism, 24, 224 Driven shaft, 24a, 224a Driven gear, 25a, 25b, 225a, 225b Eccentric cam, 31,231 Weeding blade, 31a Long part, 31b, 231b Working blade, 31c, 231c Cam hole, 31d Guide hole, 31e Pointed shape (Tip shape) , 31f, 231f Step shape, 41,241 Counter weight, 41a Short part, 41c, 241c Cam hole, 41d Guide hole, 131 Weeding blade, 131a Main body side plate, 131b Work side plate, 132 Connecting member 133 Bolt, 134 nut, 215a reduction gear, 215b intermediate shaft, 218 fulcrum shaft, 231d, 241d fulcrum hole, I blade part, II drive part, III connection part.

Claims (6)

The motor that is the power source and
A driving force conversion mechanism that converts the rotational driving force from the motor into a reciprocating driving force in the front-rear direction,
At least a housing that houses the motor and the driving force conversion mechanism,
A weeding blade that reciprocates back and forth by the reciprocating driving force obtained from the driving force conversion mechanism,
It is an electric weeder equipped with
The weeding blade is configured to have a single flat blade portion provided so as to project toward the front of the housing.
When the direction orthogonal to the front-rear direction is the left-right direction in the plan view of the blade portion,
The blade is
A long part that extends in the front-back direction and
It has a plurality of working blades that are projected in a comb-teeth shape toward both the left and right directions of the long portion .
The long portion has a tip shape at the front end and has a tip shape.
An electric weeder characterized in that the length of the front end of the tip shape in the left-right direction is shorter than the length of the rear end of the tip shape in the left-right direction . The electric weeding machine according to claim 1, wherein the tip shape is located on a straight line passing through the center of the long portion along the front-rear direction. In the electric weeding machine according to claim 1 or 2 .
An electric weeding machine characterized in that the plurality of working blades of the weeding blade are configured to be located below the lower surface of the housing. In the electric weeding machine according to any one of claims 1 to 3 .
An electric weeding machine characterized in that the weeding blade is configured to have flexibility. The motor that is the power source and
A driving force conversion mechanism that converts the rotational driving force from the motor into a reciprocating driving force in the front-rear direction,
At least a housing that houses the motor and the driving force conversion mechanism,
It is a weeding blade for an electric weeding machine that is used in an electric weeding machine equipped with the above-mentioned
It is configured to have a single flat blade portion that is provided so as to project toward the front of the housing.
When the direction orthogonal to the front-rear direction is the left-right direction in the plan view of the blade portion,
The blade is
A long part that extends in the front-back direction and
It has a plurality of working blades that are projected in a comb-teeth shape toward both the left and right directions of the long portion .
The long portion has a tip shape at the front end and has a tip shape.
A weeding blade characterized in that the length of the front end of the tip shape in the left-right direction is shorter than the length of the rear end of the tip shape in the left-right direction . The weeding blade according to claim 5, wherein the tip shape is located on a straight line passing through the center of the long portion along the front-rear direction.

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