JP2022125385A - Walking-type mower - Google Patents

Abstract

To provide a walking-type mower of which handle rod has a wide extension adjustment range and which can be stored compactly, the mower makes it possible to easily cut grass near the feet and in a place far away from the operator.SOLUTION: The invention relates to a walking-type mower that is provided with a handle guide rod 3 at an upper end of a handle base 2, the handle guide rod 3 extending rearward and upward, and having a handle rod 4 inserted therethrough to allow slidable and telescopic guidance, which handle rod can be operated by an operator, the handle guide rod 3 being horizontally rotatable S and vertically rotatable J together with the handle rod 4. The handle guide rod 3 and the handle rod 4 are made of a pipe material having a polygonal cross section. A front end of the handle rod 4 penetrates the handle guide rod 3 and protrudes forward when the handle rod 4 is contracted.SELECTED DRAWING: Figure 1

Description

The present invention relates to a walk-behind lawn mower for cutting grass on ridges, farm roads, etc., and more particularly to a walk-behind lawn mower with a wide range of extension and retraction of the handle length during mowing.

Patent Document 1 describes a walk-behind lawn mower for mowing ridges and the like with an extendable handle.

JP 2003-265012 A

When mowing a sloped surface with a small walk-behind mower, the operator usually stands on the flat surface above the sloped surface and runs the mower on the sloped surface in the contour direction. It is possible to cut grass from the feet to the bottom of the slope by extending and contracting the rod. In order to cut grass far away from the operator, a long handlebar can cut a wide range of grass. If the handle bar is set short in order to make it easier to mow, it will not be possible to extend it long, making it impossible to mow distant grass. SUMMARY OF THE INVENTION An object of the present invention is to provide a walk-behind lawn mower with a wide range of expansion and contraction adjustment of a handle rod capable of cutting both the grass around the feet and the grass far away.

A handle base 2 projecting upward from the body 1 is provided, and a handle guide rod 3 extending rearward and upward is provided at the upper end of the handle base 2, and the handle guide rod 3 is provided with a handle that can be operated by the operator. A walk-behind lawn mower configured to be slidably telescopically guided by inserting a handle rod 4, and capable of horizontal rotation S and vertical rotation J together with the handle guide rod 4, wherein the handle guide rod 3, The handle rod 4 is made of a pipe material having a polygonal cross section, and when the handle rod 4 is contracted, the front end portion of the handle rod 4 penetrates the handle guide rod 3 and protrudes forward.

According to the first aspect of the invention, a handle base 2 projecting upward from the body 1 is provided, and a handle guide rod 3 extending rearward and upward is provided at the upper end of the handle base 2, and this handle guide rod is provided. 3, a walking type that can be slidably extended and retracted by inserting a handle rod 4 that can be operated by the operator, and that can be horizontally rotated S and vertically rotated J together with the handle guide rod 4. In the lawn mower, a handle guide rod 3 and a handle rod 4 are made of a pipe material having a polygonal cross section, and when the handle rod 4 is contracted, the front end of the handle rod 4 penetrates the handle guide rod 3 and protrudes forward. Therefore, the handle rod 4 with a predetermined length has a long range of adjustment for expansion and contraction, and when the handle rod 4 is contracted, it is possible to mow the foot on an inclined surface or mowing grass while walking straight forward on a flat surface. is easy and can be stored compactly. In addition, when the handle rod 4 is extended, mowing work over a wide range is possible.

The whole side view which shows the expansion-contraction state of a handle|steering-wheel rod. The whole top view which shows horizontal rotation of a handle|steering-wheel. The whole side view which shows up-and-down rotation of a steering wheel rod. The side view and partial top view of a handle|steering-wheel base part. A partial cross-sectional plan view of the whole. FIG. 3 is a partial cross-sectional side view showing the extension/contraction configuration of the handle rod; The whole side view and partial fragmentary enlarged view which show another Example. The side view and sectional drawing of a wheel sprocket. A partial perspective view of a wheel sprocket.

Many small walk-behind lawn mowers for mowing on furrows and steep slopes have a mowing width of 40 to 60 cm, and the handle can be extended and retracted, horizontally rotated S within a specified range, and vertically rotated J. is configured to These walk-behind lawn mowers are in the form of hammer knives that rotate forward D or reverse E a reaping device A having reaping claws 11 attached to reaping shafts 10 extending in the left and right horizontal direction, or a pair of left and right front wheels 12 , 12 . and rear wheels 13, 13, and a reaping device B (FIG. 7) having a form in which a reaping blade 31 mounted on a reaping shaft 30 extending in the vertical direction is horizontally rotated. As shown in FIGS. 1 to 5, a hammer-knife type reaping device A is provided at the front of the fuselage 1, and a pair of left and right crawler traveling devices K, K are provided at the rear, and a pair of left and right crawler traveling devices K, K It is a walk-behind mower having a gearbox 14 and an engine 15 mounted above the gearbox 14 . Power of the engine 15 is transmitted from an output shaft protruding downward of the engine 15 to wheel sprockets 17 attached to the tips of wheel shafts in left and right wheel pipes 16 via gears in the gear box 14 . An idle roller 18 is pivotally supported behind the wheel sprocket 17 , and a crawler 19 made of rubber is wound around the wheel sprocket 17 and the idle roller 18 . Also, the reaper A can be rotationally transmitted through a V-belt 32 wound between the pulleys 28 and 29 from the reaper output shaft 20 on the right front side of the gear box 14 .

On the front side of the engine 14 at the central portion of the left and right, a handle base 2 is protruded upward, and a handle guide rod 3 is provided to extend rearward and upward from the upper end of the handle base 2. It is constructed so that it can be slidably extended and retracted by inserting the handle rod 4 . When the handle rod 4 is contracted to the shortest length, the front end portion of the handle rod 4 penetrates the inside of the handle guide rod 3 and protrudes forward. FIG. 6 shows how the handle guide rod 3 and the handle rod 4 are stretched and fixed. A plurality of fitting holes 21 arranged at predetermined intervals are provided on the lower surface. A handle fixture 23 having a pin 22 to be fitted into the fitting hole 21 of the handle rod 4 is provided on the lower side of the upper end portion of the handle guide rod 3 . The handle fixing member 23 is configured to be rotatable in a seesaw shape about a rotating shaft 24. When the lever 25 is rotated downward, the rotating shaft 24 is pushed against the compressive force of the compression spring 26. The fixed base 27 rotates to the center, the pin 22 is released from the fitting state of the fitting hole 21 of the handle rod 4, and the handle rod 4 can be slidably extended. Further, when the downward turning force of the lever 25 is released and the pin 22 is fitted into the fitting hole 21 of the handle bar 4 by the compressive force of the compression spring 26, the sliding expansion and contraction of the handle bar 4 is fixed. The method of fixing and releasing the handle rod 4 is not limited to the method of withdrawing and inserting the pin 22, but may be a method of tightening a bolt. Moreover, the handle guide rod 3 and the handle rod 4 do not necessarily have to have the same cross-sectional shape.

4, the handle guide rod 3 and the handle rod 4 are horizontally rotated S about the horizontal rotation shaft 33, and the handle guide rod 3 and the handle rod 4 are rotated vertically about the vertical rotation shaft 34. It shows a configuration for moving. A turning hub 36 is pivotally supported on a horizontal turning shaft 33 projecting upward from a handle turning base 35 , and a turning plate 38 having a plurality of engaging holes 37 is provided on the outer circumference of the turning hub 36 . The swivel plate 38 and the swivel lock base 39 are connected by a rear connecting plate 40. When the swivel wire 41a is pulled, the pin 42 in the swivel lock base 39 slides upward, and the engagement hole 37 of the swivel plate 38 slides upward. Then, the handle guide rod 3 and the handle rod 4 can be turned S. A front connecting plate 43 is provided on the front side of the swivel hub 36 , and a fan-shaped upper and lower plate 44 connecting the front connecting plate 43 and the rear connecting plate is provided above the horizontal rotation shaft 33 . A plurality of engagement holes 45 are provided in the upper and lower plate 44, and when the upper and lower wires 41b are pulled, a pin 47 in an upper and lower lock base 46 provided on the side of the handle base 2 slides upward, and the upper and lower plates 44 are engaged. The handle guide rod 3 and the handle rod 4 are disengaged from the mating hole 45, and the vertical rotation J of the handle guide rod 3 and the handle rod 4 becomes possible. By gripping the lever 48 provided in the operation portion M at the tip of the handle rod 4, both the turning wire 41a and the vertical wire 41b can be pulled simultaneously. , the horizontal turning S operation and the vertical turning J operation of the handle guide rod 3 and the handle rod 4 can be performed simultaneously.

In the walk-behind lawn mower of the present invention, the handle guide rods 3 and 4 are made of a pipe material having a polygonal cross section, and the front end of the handle rod 4 passes through the handle guide rod 3 when the handle rod 4 is contracted. Since it is configured to protrude forward, the expansion and contraction adjustment range L of the handle bar 4 is long by the length of the protrusion, and when the handle bar 4 is contracted, it can be used for mowing around the foot on an inclined surface or on a flat surface. The rod 4 is directed toward the rear of the machine body 1 to facilitate mowing work while a pedestrian walks straight and can be stored compactly. In addition, when the handle rod 4 is extended, mowing work over a wide range is possible.

Reference numeral 50 shown in FIG. 5 is a forward/reverse switching lever for switching the traveling direction, which can be switched to forward when the operator standing behind the operating unit M is operated to the right, and to reverse when operated to the left, and N is a neutral position. 51 is a cutting height lever that can change the grass cutting height, 52 is a shift lever that changes the running speed, and 53 is a cutting clutch lever that can turn on and off the power transmission to the cutting devices A and B.

The crawler 19 of the walk-behind lawn mower of the present invention is provided with a pair of left and right triangular inward projections 61 arranged at equal intervals over the entire inner circumference of an endless belt crawler body 60 . The crawler body 60 is provided with lugs 63 which are arranged at equal intervals over the entire outer circumference of the crawler body 60 so that the crawler body 60 can travel while being engaged with the engaging portion 62 of the wheel sprocket 17 . The wheel sprocket 17 of these crawler traveling devices K is easily entwined with grass clippings, which may adversely affect running performance. The wheel sprocket 17 consists of a disk-shaped sprocket main body 64 whose outer periphery rolls between the left and right inner projections 61, 61 of the crawler 19, and an engaging portion 62 that engages with the inner projection 61. A wheel hub 65 is provided at the center of the sprocket body 64 to which the wheel shaft 16a is attached. The engaging portions 62 are substantially triangular in side view and project from the outer circumference of the sprocket main body 64 in the left-right direction. The engaging portion 62 has a triangular apex C projecting from the outermost peripheral end of the sprocket main body 64 in the left-right direction, and an inclined portion F directed inward from the apex C to provide the sprocket main body 64. It is formed in a sandwiched form. Therefore, the lateral width W2 of the engaging portion 62 is narrower than the lateral width W1, that is, W1>W2 (see FIG. 8a). 66 and 67 are cut portions for weight reduction.

1 Airframe 2 Handle base 3 Handle guide rod 4 Handle rod J Vertical rotation S Horizontal rotation (turning)

Claims (1)

A handle base (2) projecting upward from the machine body (1) is provided, and a handle guide rod (3) extending rearward and upward is provided at the upper end of the handle base (2), and this handle guide rod ( In 3), a handle rod (4) operable by the operator is inserted so as to be slidable and retractable, and the handle guide rod (3) is horizontally rotated (S) together with the handle rod (4), and , In a walk-behind mower capable of vertical rotation (J), the handle guide rod (3) and the handle rod (4) are made of a pipe material having a polygonal cross section, and when the handle rod (4) is contracted, A walk-behind lawn mower, characterized in that the front end of a handle rod (4) penetrates the handle guide rod (3) and protrudes forward.

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