JP6648524B2 - Lawn mower - Google Patents

Description

  The present invention relates to a structure of a lawn mower that mows while traveling on the ground.

  BACKGROUND ART A lawn mower that is operated by an operator to travel on the ground and mowers during traveling is widely used. The structure of such a lawnmower is described in, for example, Patent Document 1.

  2. Description of the Related Art In a lawn mower, a blade that is rotationally driven is provided at a lower portion of a main body including a power source (motor) and a power supply (battery or the like). A front wheel and a rear wheel are respectively provided before and after the blade in the main body. For this reason, it is possible to mow the lawn with the rotating blades while running the main body by rolling the front wheel and the rear wheel in a state of being in contact with the ground. Further, a handle extending obliquely upward and rearward from the main body is provided. Therefore, an operator located behind the main body can freely move the main body (mower) back and forth by gripping the handle, and can also bend the traveling direction left and right. The handle is also provided with a switch for controlling on / off of rotation of the blade.

  This allows the operator to freely move the lawn mower, and can easily perform lawn mowing work in a wide area. At this time, an airflow toward the rear is generated along with the rotation of the blade, and the cut grass is guided into the grass collecting bag attached to the rear of the main body by the airflow. At the end of the work, the grass bag can be removed and the grass inside can be discarded.

JP 2015-8669A

  In the above-mentioned lawn mower, the worker is located behind the lawn mower (main body) and grips the handle at the time of work. Sometimes floated off the ground. This may make it difficult for the operator to operate the handle to control the travel of the lawn mower.

  In particular, as the mowing work continues, the amount of turf stored in the grass bag attached to the rear of the main body increases. For this reason, in the lawn mower, the weight of the rear portion increases as the lawn mowing operation is continued. In particular, when mowing turf having a high water content, the specific gravity of the turf increases, and the increase in the weight becomes remarkable.

  In this case, as the mowing work proceeded, the center of gravity of the lawn mower gradually moved rearward, and the load on the front wheels provided in front of the main body gradually decreased. For this reason, as the lawn mowing work was advanced, such lifting of the front wheels from the ground became remarkable.

  For this reason, a lawnmower that suppresses the lifting of the front wheels during work has been desired.

  The present invention has been made in view of the above problems, and has as its object to provide an invention that solves the above problems.

The present invention has the following configurations in order to solve the above problems.
The lawn mower of the present invention is a mowing blade for mowing the lawn by being driven, a front wheel, a main body provided with a front wheel and a rear wheel respectively at the rear, a front wheel shaft rotatably supporting the front wheel, and rearward anda handle attached to the body so as to extend, a travelable and has been mower by rolling in a state of being grounded the front wheel and the rear wheel, wherein Behind the rear wheel in the main body, a grass-collecting bag for accommodating mowed turf is mounted, and the front wheel has a substantially cylindrical outer peripheral surface that comes into contact with the ground when traveling , and a shaft portion supported by the front wheel shaft. a front wheel main body comprising a different weight portion made of a material the material constituting the front body, characterized in that is structured as a combination.
In the lawn mower according to the present invention, the front wheel body is made of a resin material, and the weight is made of metal.
In the lawn mower according to the present invention, the front wheel is formed by integrally molding the front wheel main body and the weight portion.
In the lawn mower according to the present invention, the weight portion is detachable from the front wheel main body.
In the lawn mower according to the present invention, the weight portion has an annular shape.
The lawn mower of the present invention is characterized in that the weight portion is screwed and mounted on the front wheel body.
The lawn mower according to the present invention is characterized in that the weight is attached to the front wheel main body using a fastening member for fixing the weight to the front wheel main body.
In the lawn mower according to the present invention, the weight portion is mounted on the front wheel main body by being locked by a locking portion provided on the front wheel main body.
In the lawn mower according to the present invention, the front wheel main body includes a plurality of rib portions formed to extend radially from a rotation axis of the front wheel, and the plurality of weight portions mounted between the adjacent rib portions. Is used.
A lawn mower according to the present invention is characterized in that the plurality of weight portions are each detachable.
In the lawn mower according to the present invention, the front wheel main body is provided with a cavity capable of storing a liquid, and the weight portion is formed of the liquid stored in the cavity .

  Since the present invention is configured as described above, it is possible to obtain a lawn mower in which lifting of the front wheels during operation is suppressed.

It is a perspective view from the side of the lawn mower which becomes an embodiment of the invention. It is a sectional view perpendicular to the direction of order in a portion with a front wheel of a lawnmower which becomes an embodiment of the invention. It is sectional drawing of the front wheel in the lawnmower which becomes embodiment of this invention. It is sectional drawing of the 1st modification (a) and 2nd modification (b) of the front wheel in the lawnmower which becomes embodiment of this invention. It is sectional drawing of the 3rd modification (a) and 4th modification (b) of the front wheel in the lawnmower which becomes embodiment of this invention. It is sectional drawing of the 5th modification (a), the 6th modification (b), and the 7th modification (c) of the front wheel in the lawnmower which becomes embodiment of this invention. It is sectional drawing of the 8th modification (a), 9th modification (b), and 10th modification (c) of the front wheel in the lawnmower which becomes embodiment of this invention. It is sectional drawing of the 11th modification (a) of the front wheel in the lawn mower which becomes embodiment of this invention, and the 12th modification (b). It is sectional drawing (a) and side view (b) of the 13th modification of the front wheel in the lawnmower which becomes embodiment of this invention. It is sectional drawing (a) and side view (b) of the 14th modification of the front wheel in the lawnmower which becomes embodiment of this invention.

  A configuration of a lawn mower according to an embodiment of the present invention will be described. FIG. 1 is a side perspective view showing the configuration of the lawn mower 1. FIG. 1 shows a state in which the lawn mower 1 is placed on the ground G. FIG. 2 is a sectional view taken along the line AA in FIG. In the main body 10, a motor 11 having a vertical rotation axis is mounted, and a blade (cutting blade) 12 driven by the rotation axis is provided at a lower portion of the main body 10. At this time, by operating (rotating) the height adjustment lever 13 shown in FIGS. 1 and 2, the relative position between the front wheel 14 and the main body 10 changes, and the height of the blade 12 from the ground is adjusted. Is made possible. Thereby, the height of the lawn after cutting can be adjusted.

  The main body 10 is supported on the ground G by front wheels 14 and rear wheels 15. The front wheel 14 and the rear wheel 15 are rotatable around a front wheel axis 14A and a rear wheel axis 15A, respectively, which are rotation axes perpendicular to the paper surface in FIG. In addition, as shown in FIG. 2, the front wheels 14 are actually provided independently of the front wheel axle 14A as a common rotation shaft on the near side and on the far side in FIG. On the other hand, the rear wheel 15 is elongated in the direction perpendicular to the paper of FIG. 1 and has a single cylindrical shape whose center axis coincides with the rotation axis 15A. Therefore, the main body 10 can be run on the ground G by rolling the two front wheels 14 and the rear wheel 15 in contact with the ground G. At this time, since the two front wheels 14 can be independently rolled, the traveling direction can be bent right and left.

  In addition, a handle 16 is attached to the main body 10 so as to extend upward and rearward from above at a rear portion. For this reason, the operator is located behind the main body 10 and can move the main body 10 in the horizontal direction by gripping the handle 16, and in this movement, the turf in contact with the blade 12 is cut off. A switch 16 </ b> A for controlling ON / OFF of driving of the blade 12 is provided near a portion of the handle 16 that is gripped by an operator.

  A fan (not shown) for generating an air flow is fixed to the rotation shaft of the motor 11, and the air flow is set so that the turf cut by the blade 12 flows backward and upward. The turf is guided by airflow to a grass bag 17 mounted behind the main body 10 and is stored in the grass bag 17. The grass-collecting bag 17 is detachable from the main body 10, and the grass-collecting bag 17 containing a sufficient amount of grass therein is removed from the main body 10, and after the grass stored therein is discarded, the grass-grassing bag is collected again. The bag 17 is mounted on the main body 10 to perform a lawn mowing operation. For this reason, at the time of lawn mowing work, the grass collecting bag 17 is attached to the main body 10, and the amount of grass stored in the grass collecting bag 17 increases as the work proceeds. For this reason, the weight of the grass collection bag 17 including the stored turf increases as the work proceeds.

  In FIG. 1, when the operator grips the handle 16 at the rear, the front wheel 14 is located almost at the forefront of the configuration including the operator and the lawn mower 1, while the rear wheel 15 is located substantially at the center thereof. To position. For this reason, it is difficult for the lawn mower 1 to rotate in the vertical plane around the front wheel 14, whereas it is easy to rotate the lawn mower 1 around the rear wheel 15. For example, when the operator pushes the handle 16 downward or when the weight of the turf stored in the grass bag 17 increases, the center of gravity of the lawn mower 1 moves rearward. The lawn mower 1 can be easily rotated counterclockwise (inclined rearward) around the axis 15. In this case, since the front wheel 14 rises from the ground G, it becomes difficult for the operator to make the lawn mower 1 travel properly.

  In order to suppress the floating of the front wheels 14, the lawn mower 1 is configured such that the front wheels 14 are particularly heavy without impairing the rotation operation thereof. As shown in FIG. 2, the left and right front wheels 14 are independently rotatable around a common front wheel axis 14A, and the structure is symmetrical. The outer peripheral surface of the front wheel 14 has a cylindrical shape with the front wheel shaft 14A as its central axis.

  Here, each front wheel 14 includes a front wheel main body 141 including the cylindrical outer peripheral surface (ground contact surface), and a weight 142 formed of a material different from that of the front wheel main body 141. The left and right front wheels 14 in FIG. 2 have the same structure and are provided symmetrically.

  FIG. 3 is a cross-sectional view along the center of the front wheel shaft 14A showing the structure of the front wheel 14 in detail. The front wheel main body 141 is formed of a lightweight resin material by integrating an outer peripheral portion 141A having a cylindrical grounding surface and a shaft portion 141B rotatably supported by the front wheel shaft 14A. In FIG. 3, the outer peripheral portion 141A and the shaft portion 141B are integrated by being connected in a region on the left side (outside) of the shaft portion 141B.

  On the other hand, the weight portion 142 is fixed between the shaft portion 141B and the outer peripheral portion 141A, and is made of metal (such as steel). As shown in the drawing, the weight portion 142 has a substantially annular shape that can be fitted to the front wheel body 141 from the inside (right side), and its outer diameter corresponds to the inner diameter of the outer peripheral portion 141A, and its inner diameter is the shaft. This corresponds to the outer diameter of the portion 141B. Therefore, the weight portion 142 and the front wheel main body 141 are integrated by making the outer diameter of the weight portion 142 substantially equal to the inner diameter of the outer peripheral portion 141A and fitting the outer peripheral surface of the weight portion 142 to the outer peripheral portion 141A. Can be. Alternatively, the weight portion 142 and the front wheel body 141 are integrally formed by making the inner diameter of the weight portion 142 substantially equal to the outer diameter of the shaft portion 141B and fitting the inner peripheral surface of the weight portion 142 to the outer peripheral surface of the shaft portion 141B. It can also be converted. At this time, if the weight portion 142 is mounted on the main body 141 from the inside (the side where the main body 10 is located) when the front wheel 14 is mounted, the weight portion 142 will not easily fall off after mounting.

  With the front wheel 14 having such a structure, the weight of the front wheel 14 is increased by the weight portion 142, so that the front wheel 14 can be prevented from rising. Further, the mechanical strength of the front wheel 14 is reinforced by the weight 142. Here, there are many types of lawn mowers to be produced, and the likelihood of the front wheel 14 floating up as described above differs depending on the configuration, weight, and the like of the lawn mower. On the other hand, in order to make it easy for the operator to handle, it is preferable that the entire lawn mower is lightweight. For this reason, it is preferable that the front wheel be lightweight in a model in which the front wheel is unlikely to lift. When producing a large number of lawn mowers, if the front wheels can be made common to each model, the production cost can be reduced. Therefore, it is preferable that the front wheels be common to each model.

  When the front wheel 14 is composed of the front wheel body 141 and the weight portion 142 as described above, a plurality of types of weight portions 142 having the same outer diameter and inner diameter but different weights are provided, and are combined with a single type of front wheel body 141. Thereby, the front wheels 14 having different weights can be easily obtained. Alternatively, it can be used as a front wheel in a state where only the front wheel body 141 to which the weight portion 142 is not attached is used. Thereby, the front wheels 14 corresponding to the model of the lawnmower can be manufactured at low cost, and the production cost of the lawnmower can be reduced.

  The lawn mower 1 travels on the ground G on which grass is grown while rotating the blade 12 during lawn mowing work. However, the blade 12 (motor 11 In some cases, the vehicle travels on a paved road, a concrete road surface, a floor of a building, or the like in a state where is stopped. When the lawn mower 1 travels on the ground G with grass, the noise generated by the front and rear wheels during traveling is small, or this noise does not matter when the blade 12 is driven. In the above-described movement, noise generated from the front wheels and the rear wheels becomes a problem. This noise is particularly large when the ground surfaces of the front and rear wheels are made of metal. Alternatively, if the ground surface is made of a high-strength metal (such as steel), the floor of the building may be damaged when moving.

  For this reason, it is particularly preferable that the ground plane be made of a resin material. In the above configuration, the front wheel body 141 including the ground contact surface is made of a lightweight resin material, and the weight portion 142 made of a metal material is combined with the front wheel body 141 to make the front wheel 14 heavier and separate from the front wheel 14 during traveling. The generated noise can be reduced. For this reason, it is particularly preferable to provide an elastomer on the ground plane.

  As described above, as the structure for combining the front wheel body and the weight portion, other structures are possible in addition to the structure in which they are fitted as described above. FIGS. 4A and 4B are cross-sectional views showing two examples (a first modification and a second modification) of such a configuration.

  In the first modified example (FIG. 4A), the weight portion 142 is formed integrally with the front wheel body 141 made of a resin material, and is embedded in the front wheel body 141. Thus, the weight portion 142 can be particularly firmly fixed to the front wheel main body 141. At this time, since the outer shape of the front wheel body 141 (the front wheel 14) can be made common, a common mold is used as a mold for molding the resin material, and different shapes, sizes, A heavy one can be used.

  In the second modified example (FIG. 4B), the front wheel main body 141 provided with the cavity 141C and the small liquid supply port 141D that allows the cavity 141C to communicate with the outside is provided in advance as shown in the upper part. Manufactured. Thereafter, as shown in the lower part, the liquid 200 (water or the like) is injected into the cavity 141C from the liquid supply port 141D, and the liquid supply port 141D is closed by the stopper 143, so that the liquid 200 in the cavity 141C is combined with the weight 142. can do. While the front wheel body 141 is common, the weight of the weight portion 142 can be adjusted by the amount of liquid 200 injected and its type (specific gravity). In this case, the weight of the weight portion 142 can be changed by once supplying the liquid to form the weight portion 142 and then extracting or adding the liquid from the liquid supply port 141D.

  In order to make it possible to easily change the weight of the weight 142, a plurality of weights 142 having different weights may be prepared so that the weight 142 can be easily attached to and detached from the front wheel body 141. In the third modified example (FIG. 5A) and the fourth modified example (FIG. 5B), an annular weight 142 is fixed to the front wheel body 141 by screwing. This is an example of a configuration. In FIG. 5A, a threaded portion S connected by a screw is formed between the outer peripheral surface of the weight portion 141 and the inner peripheral surface of the outer peripheral portion 141A of the front wheel body 141, and in FIG. A threaded portion S is formed between the inner peripheral surface of the weight portion 141 and the outer peripheral surface of the shaft portion 141B of the front wheel body 141 by a screw. In either case, the weight portion 142 can be fixed to the front wheel main body 141 by rotating and tightening the weight portion 142 from the right side in FIG. 5, and the weight portion 142 can be easily removed. In addition, it is preferable that the direction of the screw (left-handed screw, right-handed screw) in the threaded portion S is reversed in the left and right front wheels 14 so that the threaded portion S is not loosened during traveling.

  The weight of the weight portion 142 is adjusted by adjusting the form of the weight portion 142 other than the outer peripheral surface and the inner peripheral surface, for example, by providing a plurality of through holes penetrating the weight portion 142 in the direction of the front wheel shaft 14A, Can be adjusted by changing. The weight can also be adjusted by changing the thickness of the weight portion 142 in the direction of the front wheel shaft 14A and changing the material of the weight portion 142.

  The fifth modification (FIG. 6A), the sixth modification (FIG. 6B), and the seventh modification (FIG. 6C) lock the weight 142 on the front wheel body 141. The weight portion 142 can be attached to the front wheel main body 141 by providing a locking portion to be locked and locking the weight portion 142 to the locking portion. At this time, the shape of the weight portion 142 is substantially annular, as in the structure of FIG. 3. However, unlike the case where the weight portion 142 is fitted to the front wheel main body 141 as shown in FIG. And a slight play can be provided between the outer peripheral surface of the shaft portion 141B and the inner peripheral surface of the outer peripheral portion 141A, and between the inner peripheral surface of the weight portion 142 and the outer peripheral surface of the shaft portion 141B. It will be easier.

  In the fifth modification (FIG. 6A), a locking portion 141E protruding toward the front wheel shaft 14A is provided on the outer peripheral portion 141A of the front wheel main body 141. FIG. 6A shows one cross section of the front wheel 14, but actually the locking portions 141E are provided separately at a plurality of positions in the circumferential direction. At this time, if a concave portion that engages with the locking portion 141E is provided at a position corresponding to the locking portion 141E of the weight portion 142, the weight portion 142 is prevented from rotating with respect to the front wheel main body 141 after mounting. . In the sixth modification (FIG. 6B), the locking portion 141F is provided so as to protrude from the shaft portion 141B to the side opposite to the front wheel shaft 14A. With this structure, the weight portion 142 can be mounted on the front wheel body 141 as in FIG. In particular, when the front wheel main body 141 is made of a resin material, the locking portions 141E and 141F formed as a part thereof can be small and elastically deformed, so that the weight portion 142 can be easily attached and detached. is there.

  In a seventh modification (FIG. 6C), the weight portion 142 is provided with a plurality of through holes 142A, which are small-diameter through holes penetrating the weight portion 142 in the direction of the front wheel shaft 14A. On the other hand, between the outer peripheral portion 141A and the shaft portion 141B of the front wheel main body 141, a locking portion 141G extending in parallel with the front wheel shaft 14A and having a tip bent to the opposite side to the front wheel shaft 14A passes through the through hole 142A. A plurality is provided. The bent portion at the distal end of the locking portion 141G locks the weight portion 142 on a side farther from the front wheel shaft 14A than the through hole 142A, so that the weight portion 142 is mounted on the front wheel main body 141. The locking portion 141G may be formed integrally with the front wheel main body 141 and made of a resin material, or may be made of an elastic metal material and fixed to the front wheel main body 141.

  6, a plurality of weights 142 having different weights can be used similarly to the configuration of FIG. In this case, the weight of the weight portion 142 can be changed by changing the thickness of the portion of the weight portion 142 other than the portion in contact with the locking portion. In addition, since the shape of the weight portion 142 other than the portion in contact with the locking portion can be changed, the weight of the weight portion 142 can also be adjusted by this shape.

  6, the locking portion may be provided on the weight portion side, and the weight portion may be similarly mounted on the front wheel main body. However, when the front wheel body is made of a resin material and the weight portion is made of metal, the locking portion can be formed of a resin material that can be elastically deformed small. It is particularly preferred to form.

  In addition, the weight portion 142 can be attached to the front wheel body 141 using a member (fastening member) different from the front wheel body 141 and the weight portion 142. FIG. 7 is a sectional view showing an eighth modified example (FIG. 7A), a ninth modified example (FIG. 7B), and a tenth modified example (FIG. 7C). It is.

  In the eighth modified example (FIG. 7A), a fixing screw (fastening member) 144 that penetrates the front wheel body 141 in the direction of the front wheel shaft 14A is provided on the weight portion 142 and the inner peripheral surface is subjected to thread cutting. The weight portion 142 is fixed by screwing the through hole 142A into the threaded portion S. The number of the fixing screws 144 and the number of the locking portion through holes 142A are set as appropriate.

  In the ninth modified example (FIG. 7B), the weight support portion is attached to the front wheel main body 141 with the weight portion 142 having a larger margin between the front wheel main body 141 than in the configuration of FIG. (Fastening member) 145 is further mounted. The weight support portion 145 has an outer peripheral surface that is threaded similarly to the weight portion 142 in FIG. 5A, and an inner peripheral surface that is also threaded similarly to the front wheel body 141 in FIG. 5A. The outer peripheral portion 141A (the front wheel body 141) is screwed. For this reason, the weight portion 142 is attached to the front wheel main body 141 by using the weight portion support portion 145 and forming the inner peripheral surface of the outer peripheral portion 141A (the outer peripheral surface of the weight portion support portion 145) as the threaded portion S. Can be. Similarly, in the tenth modified example (FIG. 7C), the inner peripheral surface of the weight supporting portion (fastening member) 146 and the outer peripheral surface of the shaft portion 141B are similar to the configuration of FIG. The weight portion 142 can be attached to the front wheel main body 141 using the weight support portion 146 by using the screw portion S.

  In the eighth to tenth modifications, the weight portion 142 is fixed to the front wheel body 141 by screwing and fixing the fastening members, whereas the eleventh modification (FIG. 8A) In the twelfth modified example (FIG. 8B), a metal retaining ring is used as a fastening member. In the eleventh modified example (FIG. 8A), a locking groove 141AA is formed over the entire circumference of the inner peripheral surface of the outer peripheral portion 141A of the front wheel body 141, and a stopper that engages with the locking groove 141AA on the outside. A ring (fastening member) 147 is used. The retaining ring 147 has a substantially annular shape centered on the front wheel shaft 14A, and has a form in which one portion in the circumferential direction is divided. The outer diameter of the retaining ring 147 is set so that the retaining ring 147 can be mounted on the front wheel main body 141 with the outer end of the retaining ring 147 engaged with the locking groove 141AA. For this reason, as shown in FIG. 8A, the retaining ring 147 is further engaged with the locking groove 141AA in a state where the weight 142 is mounted, so that the retaining ring 147 and the weight 142 are attached to the front wheel main body 141. Can be installed. By elastically deforming the retaining ring 147, the retaining ring 147 can be easily attached and detached. Similarly, in a twelfth modified example (FIG. 8B), a snap ring (fastening member) 148 that engages inside with a locking groove 141BA formed over the entire outer circumferential surface of the shaft portion 141B is used. Can be

  In the eighth to twelfth modifications, although a fastening member is required as a component other than the front wheel body 141 and the weight portion 142, the weight portion 142 is attached to the front wheel body 141 using the fastening member. The degree of freedom of the shape is increased. For example, the gap between the outer peripheral surface of the weight portion 142 and the inner peripheral surface of the outer peripheral portion 141A, and the gap between the inner peripheral surface of the weight portion 142 and the outer peripheral surface of the shaft portion 141B may be set to be large. it can. Therefore, the weight of the weight portion 142 can be set widely, and various types of weight portions 142 having a wide range of weight setting can be easily attached to the front wheel main body 141.

  In addition, the shape of the weight portion can be set according to the configuration of the front wheel body. FIGS. 9A and 9B are a cross-sectional view (a) and a side view (b) of a thirteenth modified example in which the strength of the front wheel main body is particularly increased, and a weight portion corresponding to the configuration is provided. The cross-sectional view (FIG. 9A) corresponds to FIG. 3 and the like, and the side view (FIG. 9B) corresponds to FIG.

  The front wheel main body 241 of the front wheel 24 is made of a resin material in which an outer peripheral portion 241A and a shaft portion 241B are integrated like the front wheel 14. However, in the front wheel 24, as shown in FIG. 9B, a plurality of plate-like rib portions 241C are formed radially from the shaft portion 241B toward the outer peripheral portion 241A. Due to the rib portion 241C, the mechanical strength of the front wheel 24 is higher than that of the front wheel 14. The weight portion 242 provided with a plurality of grooves corresponding to the plurality of rib portions 241C is fitted and mounted on the front wheel main body 241 from the inside to the outside in FIG. 9A. However, in this case, the mechanical strength of the front wheel main body 241 in which the weight portion 242 is not mounted is sufficiently high, so that the width of the weight setting of the front wheel 24 is particularly wide.

  In this case, the rotation of the weight portion 242 with respect to the front wheel main body 241 is suppressed by the rib portion 241C. Further, in the front wheel 24, as a method of attaching the weight portion 242 to the front wheel main body 241, the method in the above-described modified example other than the third and fourth modified examples (FIG. 5) in which the weight portion 142 is screwed is used. be able to. Also, in this case, if the groove in the weight portion 242 and the rib portion 241C are fitted, the gap between the outer peripheral surface of the weight portion 242 and the inner peripheral surface of the outer peripheral portion 241A, the inner peripheral surface of the weight portion 242 and the shaft portion Even when the gap between the outer peripheral surface of the front wheel 241B and the outer peripheral surface of the front wheel main body 241 is increased, the weight 242 can be fitted to the front wheel main body 241 and mounted. Therefore, the weight of the weight portion 242 can be adjusted by adjusting the gap between them.

  FIG. 10 shows a configuration of a front wheel 34 according to a fourteenth modified example obtained by further modifying the configuration of FIG. 9 in correspondence with FIG. 9. The front wheel main body 241 used here is the same as that in FIG. 9, a single weight 242 is used, whereas in this configuration, 242A to 242H corresponding to the case where the weight 242 is divided into eight by seven ribs 241C are used. Have been. Each of the weights 242A to 242H is detachable between the ribs 241C. Therefore, by selecting some or all of the weights 242A to 242H and mounting them on the front wheel main body 241, the weight of the entire weight can be adjusted. At this time, in order to make the rotation of the front wheel 24 smooth, it is preferable to select the weight portions 242A to 242H so as to be symmetrical about the shaft portion 241B (front wheel axis).

  The shape of the front wheel main body in the above configuration may be different from the above configuration as long as it is rotatable around the front wheel axis and can roll on the ground. Accordingly, the shape of the weight portion can also be set according to the shape of the front wheel body. According to the shapes of the front wheel main body and the weight portion, the structure and position of the locking portion and the fastening portion can be set.

1 lawn mower 10 body 11 motor 12 blade (cutting blade)
13 Height adjustment levers 14, 24 Front wheel 14A Front wheel shaft 15 Rear wheel 15A Rear wheel shaft 16 Handle 16A Switch 17 Grass collecting bag 141, 241 Front wheel main body 141A, 241A Outer portions 141AA, 141BA Locking grooves 141B, 241B Shaft portion 141C Cavity 141D Liquid supply ports 141E, 141F, 141G Locking portions 142, 242, 242A to 242H Weight portions 142A Through holes 143 Plugs 144 Fixing screws (fastening members)
145, 146 weight support part (fastening member)
147, 148 Retaining ring (fastening member)
200 Liquid 241C Rib portion G Ground S Screw portion

Claims (11)

A cutting blade for mowing the turf by being driven, and a main body provided with front wheels and rear wheels respectively in front and rear,
A front wheel shaft that rotatably supports the front wheel,
A handle attached to the main body so as to extend rearward from the main body,
A lawn mower that is capable of traveling by rolling while the front wheel and the rear wheel are in contact with the ground,
Behind the rear wheel in the main body, a grass collection bag for accommodating the cut grass is mounted,
The front wheel is
A substantially cylindrical outer peripheral surface that comes into contact with the ground when traveling , and a front wheel main body including a shaft portion supported by the front wheel shaft ;
Lawn mower, characterized in that the the weight portion constituted of a different material the material constituting the front body, is configured by combining.   The lawn mower according to claim 1, wherein the front wheel body is made of a resin material, and the weight is made of metal.   The lawn mower according to claim 1, wherein the front wheel is formed by integrally molding the front wheel main body and the weight portion.   The lawn mower according to claim 1, wherein the weight portion is detachable from the front wheel body.   The lawn mower according to claim 4, wherein the weight portion has an annular shape.   The lawn mower according to claim 5, wherein the weight portion is screwed and mounted on the front wheel body.   The lawn mower according to claim 4, wherein the weight portion is attached to the front wheel body using a fastening member that fixes the weight portion to the front wheel body.   The lawn mower according to claim 4, wherein the weight portion is attached to the front wheel main body by being locked by a locking portion provided in the front wheel main body. The front wheel body includes a plurality of rib portions formed to extend radially from a rotation axis of the front wheel,
The lawn mower according to claim 7 or 8, wherein a plurality of the weight portions mounted between the adjacent rib portions are used.   The lawn mower according to claim 9, wherein each of the plurality of weight portions is detachable. The front wheel main body is provided with a cavity capable of containing a liquid,
The lawn mower according to claim 1, wherein the weight portion is formed of the liquid accommodated in the cavity.

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