JP6709438B2 - Walk-behind mower - Google Patents

Description

The present invention relates to a walk-behind mower equipped with a pair of left and right traveling wheels for driving, and more specifically, when performing grass mowing work on flat ground, the grass can be easily scraped, and narrow mounds on ridges are cut. The present invention relates to a structure of a walk-behind mower that can be easily operated.

A walk-behind mower having grounding wheels provided on the left and right sides of the cutting blade housing is disclosed in Patent Document 1, and a grass mower having a grounding wheel provided at the front center of the cutting blade housing is disclosed in Patent Document 2. ..

JP, 2008-167679, A JP-A-8-336722

Conventionally, a four-wheel drive type walking having a pair of left and right traveling drive wheels provided at the rear of the machine body, a pair of left and right grounding wheels provided at the front of the machine body, or a pair of left and right front wheels that are driven similarly to the traveling drive wheels. A type mower is known. In addition, a walk-behind mower equipped with a pair of left and right traveling drive wheels or traveling crawlers at the rear of the machine body, a cutting blade housing including a mowing device is provided in front of it, and grounding wheels are provided on both left and right sides of the cutting blade housing. Are known. However, these walk-behind mowers have an obstacle to the grass cutting in the front center part of the cutting blade housing in consideration of the mowing work efficiency, the left-right balance of the machine body, and the scraping property of the cutting grass into the cutting blade housing. In many cases, the grounding wheel is provided outside the right and left sides of the blade housing without widening the grounding wheel. These walk-type mowers equipped with wide contact wheels and running wheels are relatively small, but when performing mowing work on narrow ridges, the abdomen of the machine touches the ground and cannot be mowed. It was Therefore, an object of the present invention is to provide a walk-behind mower capable of performing wide-ranging mowing work on a flatbed and easily and efficiently performing mowing work such as ridges.

At the front of the machine body 1, a cutting blade housing 3 provided with grounding wheels 2 and 2 at both left and right outer positions is provided, and at the rear thereof, a prime mover 4 and a pair of left and right traveling wheels 5 and 5 are provided to extend upward and rearward of the machine body 1. In a walk-type mowing machine in which a worker walking behind the handle 6 can perform grass cutting work while holding the handle 6 to be installed, the horizontal distance W between the running wheels 5 and 5 is configured to be expandable and contractable, and 2 and 2 are moved up and down so that the cutting height of the grass can be adjusted , and when the grounding wheels 2 and 2 arranged on both the left and right outer sides of the cutting blade housing 3 are moved up and down, the grounding wheels 2, The front end of the cutting blade housing 3 is configured so as not to project from the front end F of the side plate 35 of the cutting blade housing 3, and the grounding wheel attachment portion 7 is provided in the center of the cutting blade housing 3 on the upper front side. The ground wheel 2a is configured to be attachable to and detachable from the attachment portion 7.

The invention according to claim 1 is configured such that the lateral distance W between the traveling wheels 5 and 5 can be expanded and contracted, and the grounding wheels 2 and 2 can be moved up and down to adjust the cutting height of the grass and the cutting blade. When the grounding wheels 2 and 2 arranged on both the left and right outer sides of the housing 3 are moved up and down, the front ends of the grounding wheels 2 and 2 do not protrude from the front end F of the side plate 35 of the cutting blade housing 3 in side view. Since the grounding wheel attachment portion 7 is provided in the central portion on the upper front side of the cutting blade housing 3 and the grounding wheel 2a is configured to be attachable to and detachable from the grounding wheel attachment portion 7, it is possible to perform grass cutting work on a flat land or the like. In this case, the stability of the machine body 1 and the scraping property of the grass can be improved by expanding the width of the grounding wheels 2 and 2 at the left and right outer side positions of the cutting blade housing 3 and the left and right traveling wheels 5 and 5 by widening the gap W. When performing grass cutting work such as narrow ridges, the grounding wheel 2a is attached to the grounding wheel attachment portion 7 provided in the front upper center portion of the cutting blade housing 3, and the left and right running wheels 5, By narrowing the 5-interval W to a narrow width, it becomes possible to perform a mowing operation such as a ridge that is narrow enough to walk. Further, even if the grounding wheels 2 and 2 are adjusted to move up and down, the front ends of the grounding wheels 2 and 2 do not project from the front end F of the side plate 35. There is little grass involvement in 2.

Overall plan view of walk-behind mower Overall side view of walk-behind mower Rear view showing the relationship between the driving wheels and the ground wheels Side view showing the structure of the grounding wheel Side view showing attachment/detachment state of grounding wheel Side view when the grounding wheel is set to the lowest position

The walk-behind mower of the present invention is provided with a mowing device 8 capable of mowing weeds in front of the machine body 1, and an outer peripheral portion thereof is covered with a mowing blade housing 3. A gear box 15 is provided in the center of the machine body, a prime mover 4 is provided behind the gear box 15, and traveling wheels 5 are provided below the gear box 15. A handle 6 extending from the upper part of the gear box 15 toward the upper rear of the prime mover 4 is provided. It is provided. The power of the prime mover 4 is transmitted to the traveling wheels 5 and the reaping device 8 via the gear box 15, the transmission to the traveling wheels 5 is made by the traveling clutch 16, and the transmission to the reaping device 8 is made by the reaping clutch 17. You can turn on and off the transmission to each by turning off. Reference numeral 22 is a side clutch lever for turning on/off each of the left and right traveling wheels 5, 5, and fixing the rotation, a reference numeral 18 is a shift lever for changing the traveling speed, and a reference numeral 19 is for increasing or decreasing the rotational speed of the prime mover 4. The throttle lever 20 is for turning the handle 6 in a fixed rotation state when the handle 6 is turned in a state A in which the handle 6 is directed in the same direction as the traveling direction of the body 1 or a state B in which the handle 6 is oriented in a direction orthogonal to the traveling direction of the body 1. It is a turning lever that can be turned to a state where it can turn to about 100 degrees to the left and right from the state A, that is, to turn further forward from the state B in the direction orthogonal to the traveling direction of the body 1. Further, reference numeral 21 is a handle up/down lever capable of switching up/down rotation of the handle 6 in a predetermined range between a fixed state and a rotatable state.

The lateral distance W between the running wheels 5 and 5 is configured such that the rut distance can be expanded or contracted between an expanded state W1 and a contracted state W2. The expansion/contraction method is performed by removing the pin 23 and changing the hole positions of the axle 24 hole and the wheel boss 25. The traveling wheels 5 and 5 adopt relatively wide tires, and the gear box 15 provided between the left and right traveling wheels 5 and 5 is formed to have a narrow width. The left and right stability is good, and the left and right stability is maintained even when the size is reduced, and stable running is possible even on narrow running road surfaces such as ridges.

The driving force of the prime mover 4 is transmitted to the cutting blade shaft 9 via the gear box 15 and the cutting blade transmission system path D, and this transmission can be connected and disconnected by turning on and off the cutting blade clutch 17. .. A plurality of flare knives 10 are provided around the cutting blade shaft 9, and the flare knives 10 attach a pair of left and right knives in a Y-shape and can be rotated within a predetermined range. In a side view, the front side of the cutting blade shaft 9 is in the form of a hammer knife that can cut grass by rotating the upper so as to rotate upward. The outer periphery of the mowing device 8 is covered with the mowing blade housing 3, and the left and right outer sides of the mowing blade housing 3 are provided with wheels 31 pivotally supported by the grounding wheel shaft 30 and the grounding wheels 2 and 2 which are vertically slidable. There is. When the ground wheels 2 and 2 slide up and down, the lever 27 is pulled against the urging force of the spring 26 to release the fitting of the hole 29 of the sliding rod 28 of the ground wheel 2 and 2 into the other hole 29. It can be done.

On the upper front side of the cutting blade housing 3, gravel and grass are scattered from the front of the cutting blade housing 3 toward the operator (operator) due to vines and strings wound around the cutting device 8 in the form of a hammer knife. A scattering prevention cover 11 capable of preventing the above is provided. The shatterproof cover 11 is formed to have substantially the same width as the left and right width WK of the cutting blade housing 3, and is attached to the cover bases 32 provided at both left and right ends on the upper front side of the cutting blade housing 3 with bolts 33. The cutting blade housing 3 is bent forwardly and upwardly, and the scattering wheel cover 11 is provided with a grounding wheel 2a or a grounding wheel attachment portion 7 to which the grounding wheel 2 can be attached, in the left and right central portions. In the present embodiment, the grounding wheel attachment portion 7 is entirely welded to the shatterproof cover 11, but a part thereof may be fixed to the cutting blade housing 3 side. The grounding wheel attached to the grounding wheel attachment portion 7 can be either a new grounding wheel 2a, or one of the grounding wheels 2 and 2 provided on the left and right outer sides of the cutting blade housing 3. It may be configured as follows. When one of the left and right grounding wheels 2 is attached to the grounding wheel attachment portion 7, the remaining one grounding wheel 2 is removed, and the sliding rod 28 is fitted from above the grounding wheel base 34 and grounded. It is preferable to attach the wheel 2 in the opposite direction so that the grass does not come into contact with the grounding wheel 2 during the mowing work to prevent resistance.

During mowing work on a sloping ground or a flat ground, a stable mowing work can be performed by setting the expanded state W1 in which the lateral distance W between the traveling wheels 5, 5 is expanded. Further, during mowing work such as on ridges, the horizontal distance W between the traveling wheels 5 and 5 is set to a reduced state W2, and a new grounding wheel 2a or a grounding wheel 2 provided on both outer sides of the cutting blade housing 3 is provided. Either one of the two grounding wheels 2 is attached to the grounding wheel attachment portion 7 provided in the central portion on the left and right. Usually, the ridge also has the purpose of improving the ventilation of the rice field, and it is necessary to perform mowing work on the ridge relatively frequently, the grass height does not become high like in fallow fields, and the front ground contact at the center of the cutting blade housing 3 is required. Even if the wheels 2 and 2a are projected, the performance of cutting grass into the cutting device 8 is not so affected, and from this fact, it is possible to perform stable mowing work without cutting residue even on narrow ridges. Is.

The ground wheel bases 34 on both the left and right outer sides of the cutting blade housing 3 are formed in a square pipe shape in cross section and are welded upward and rearward, and the inside of the ground wheel base 34 has a square pipe shape in cross section of the ground wheels 2 and 2. By sliding the sliding rod 28 up and down, the cutting height of the grass can be adjusted. The vertical height of the grounding wheels 2 and 2 can be adjusted by fitting and releasing the holes 27 provided in the sliding rod 28 and the lever 27. When the grounding wheels 2 and 2 are set to the lowermost position so that the cutting height of the grass is high, the grounding wheels 2 and 2 are at the most forward positions. The front end is configured so as not to project from the front end F of the side plate 35 of the cutting blade housing 3, so that the grass can be taken in from the front side easily, and the grass is not wound around the grounding wheels 2 and 2.

1 Aircraft 2 Grounding Wheel 2a Grounding Wheel 3 Cutting Blade Housing 4 Motor 5 Running Wheel 6 Handle 7 Grounding Wheel Attachment 8 Mowing Device 9 Cutting Blade Axis 10 Flail Knife 11 Scatter Prevention Cover W Interval WK Left and Right Width

Claims (1)

In front of the machine body (1), a cutting blade housing (3) provided with grounding wheels (2), (2) at both left and right outer positions is provided, and behind that, a prime mover (4) and a pair of left and right running wheels (5), (5) is provided, and a handle (6) extending toward the upper rear of the machine body (1) is provided with a walking type mower capable of performing a grass cutting operation while an operator walking behind the handle (6) holds the handle (6). The lateral distance (W) between the running wheels (5), (5) can be expanded and contracted, and the grounding wheels (2), (2) can be moved up and down to adjust the cutting height of the grass and the cutting blade. When the grounding wheels (2), (2) arranged on both the left and right outer sides of the housing (3) are moved up and down, the front ends of the grounding wheels (2), (2) have a side view cutting blade housing (3) side plate. The cutting wheel housing (3) is configured so as not to project from the front end (F) of the cutting blade housing (3) , and further provided with a grounding wheel attachment portion (7) at the center of the front upper side of the cutting blade housing (3). ) To the grounding wheel (2a) is detachable.

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