JP6612121B2 - Walking type mower and mowing method - Google Patents

Description

  The present invention relates to a walking mower and a mowing method. More specifically, when mowing the portion along the obstacle, the stepping stone hits the worker, the person in the vicinity, the object in the vicinity (hereinafter referred to as “operator etc.”), or touches the obstacle. The present invention relates to an apparatus that can suppress the occurrence of an accident such as breakage of a cutter and reduce the mental or physical burden on an operator.

  Conventionally, in order to perform mowing work around obstacles such as fences, walls, and pedestrian boundary blocks, mowers that have a circular blade that rotates at high speed and are carried by the operator or used on the back have been used. Yes. When working with such a mower, the rotation speed of the rotary blades is high, so the blades may hit the pebbles scattered around the work place and play the pebbles (hereinafter referred to as “stepping stones”). However, it is very dangerous if a stepping stone hits people or objects in the vicinity.

  Therefore, as a mower equipped with such a circular blade that is unlikely to cause stepping stones, for example, a brush cutter (trade name: Super Calmer Set, “Super Calmer” is a registered trademark) described in Non-Patent Document 1 below, A mop mower described in Non-Patent Document 2 below has been proposed.

  The brush cutter 8 described in Non-Patent Document 1 shown in FIG. 9 is attached to the operating rod 82 with an operating handle 821, a motor 81 provided at the rear of the operating rod 82, and the front of the operating rod 82. It has a structure with a rotary blade 83, two rotary blades of the same diameter having a plurality of blades on the outer periphery, and reversely rotated at a low speed so that the vegetation is sandwiched between the blades. It is a thing.

  A mop mower 9 described in Non-Patent Document 2 shown in FIG. 10 is a hand-held traveling mower, and includes a frame 92 on which an engine 91 is mounted, a pair of left and right wheels 93 provided at the lower part of the frame 92, and a frame. 92 is provided at the rear end of the connecting pipe 96, a chassis 90 comprising a handle 94 provided at the rear, a connecting pipe 96 provided at the front of the chassis 90 through which a rotating shaft driven by the engine 91 is passed, The structure is provided with a rotary blade 95 to which power is transmitted by a rotary shaft and a cover 951 that covers the periphery of the rotary blade 95, and makes it difficult for stepping stones to occur.

IDEC Co., Ltd. Product Catalog Super Calmer Set Internet (URL http://www.idech.co.jp/DL/calpro.pdf) Search date November 9, 2015

Nikkari Co., Ltd. Product Catalog Mop Mower Internet (URL http://www.nikkari.co.jp/product/mop/index.html) Search date November 13, 2015

  However, the brush cutter 8 is carried out by a worker through a shoulder strap (not shown in FIG. 9 for the sake of convenience) and the like. The physical burden on the worker when working continuously due to vibration and vibration was great. Further, since the rotary blade 83 of the brush cutter 8 is bare even if it rotates at a low speed, there is a risk that the blade will be lost if the rotary blade 83 hits an obstacle. The rotary blade 83 becomes an obstacle during mowing work. Since the work was done with care not to hit it, the mental burden was also great.

  On the other hand, since the mop mower 9 is a traveling type, it has less physical burden on the worker than the brush cutter 8 that the worker carries out the work, but the operator pushes it to make it run continuously. Thus, when performing work, a physical burden is added to the worker. In addition, since the cover 951 is open only in the traveling direction, for example, when cutting a plant growing along a wall or along a pedestrian boundary block, if the work is performed while traveling along the wall or block, Or, there is a need for cutting twice at the base of the block, and cutting off the remaining cutting.

  The present invention was devised in view of the above points, and when performing a mowing operation of a portion along an obstacle, a stepping stone hits an operator or the like, or a cutter breaks caused by contact with the obstacle It is an object of the present invention to provide a walking mower and a mowing method that can suppress the occurrence of such accidents and reduce the mental or physical burden on the operator.

  In order to achieve the above object, a walking mower according to the present invention includes a motor, a traveling wheel driven by the motor, a main body having an operation handle including a gripping part, and a peripheral part outward. Each of them has a plurality of cutting blades projecting toward each other, and the rotation centers thereof are the same so that one or both of them can be rotated so that the target plant can be sandwiched between the upper and lower cutting blades. A cutter part having an upper circular blade and a lower circular blade, and connecting the cutter part and the main body part, and depending on the position of the target plant, the position of the cutter part is either the traveling direction of the main body part or the left and right A cutter support section having a switching mechanism capable of switching in the direction of the above, a transmission means for transmitting the power of the prime mover to the cutter section, and the rotational speed of the upper circular blade or the lower circular blade, Between motivation and the cutter portion comprises a reduction gear for decelerating at a required reduction ratio, and a guard member having an abutment portion located outside the rotation locus of the cutting edge of the cutting edge.

  Here, the traveling wheel and the cutter unit are driven by the prime mover included in the main body unit. Thereby, since the walk-type mower including the main body can be self-propelled, the physical burden on the operator is reduced. Further, the main body is operated by an operation handle including a grip portion.

  Each of the upper circular blade and the lower circular blade has a plurality of cutting blades that protrude outward from the peripheral edge portion, and the cutter portion has one or both of them so that the respective rotation centers are the same. Since they are stacked so as to be rotatable, even if the rotational speed is low, the target plant can be sandwiched between the upper and lower cutting blades.

  The speed reducer decelerates the rotational speed of the upper circular blade or the lower circular blade at a required reduction ratio between the prime mover and the cutter unit. Since power transmission from the prime mover to the cutter unit is performed via the transmission means and the speed reducer, one or both of the upper circular blade and the lower circular blade can be rotated at a low speed. At this time, since the cutter unit obtains a torque proportional to the reduction ratio by the speed reducer, the rotation speed is at least given to the upper and lower cutting blades with sufficient force to sandwich the target plant.

  In addition, with conventional cutters of mowers, a single rotary blade rotates at high speed only in one direction, cutting vegetation, resulting in the occurrence of stepping stones and the risk of hitting workers etc. However, since one or both of the upper circular blade and the lower circular blade rotate at a low speed in the cutter portion of the present invention, it is possible to suppress generation of stepping stones and damage to workers due to stepping stones. Can do.

  The cutter support part supports the cutter part by connecting the main body part. Furthermore, since the cutter support part has a switching mechanism for the position of the cutter part, the position of the cutter part in the traveling direction of the main body part or in the left or right direction according to the position of the vegetation to be mowed. Can be switched. This makes it possible to mow the grass located on the left and right sides of the aircraft while the walking mower is running straight along the road shoulder.

  In the guard body, the abutting portion is positioned outside the rotation locus of the cutting edge of the cutter blade of the cutter portion, so that the cutting blade of the cutter portion can be prevented from hitting an obstacle when performing mowing work. . As a result, it is possible to suppress an accident that the cutting blade hits an obstacle and the cutting edge is missing, so that the safety of the operator or the like is ensured.

  In addition, the operating handle is provided with a throttle of the prime mover, and is urged in a direction to squeeze the throttle, and is moved so as to squeeze the throttle by moving away from the gripping portion by a biasing force from a position close to the gripping portion of the operating handle. In the case where the urging member is provided, the throttle of the prime mover is throttled when the urging member is separated from the grip portion. As a result, for example, when the operator moves the urging member to the gripping portion of the operation handle and grips it together, even if there is some trouble such as the operator crawls, if the hand leaves the handle, Since the walking type mower stops its travel and the rotation of the cutter part also stops, the safety of workers and the like is high.

  In addition, when a handle angle adjusting unit that can adjust the horizontal angle of the operation handle to a required angle is provided, the direction of the operation handle with respect to the main body can be adjusted. For example, since the direction of the operation handle can be switched not only to the side opposite to the traveling direction of the main body, but also to the left or right direction of the traveling direction, the worker walks on the sidewalk side and the mower travels on the roadside side. This makes it possible to improve the operator's safety.

  Further, in the case of having a vegetation removing portion that is provided on the upper surface of the upper circular blade, protrudes above the upper circular blade, and rotates with the rotation of the upper circular blade, the vegetation removing portion is the upper circular blade. Rotate and move with the rotation. Thereby, for example, even if the cut vegetation covers the cutter part, the rotating vegetation removal part can remove them, so there is no need to remove them one by one and the workability is good.

  Further, in the case of including an adjustment mechanism that can adjust the position of the abutting portion of the guard body according to the cutting side of the upper circular blade and the lower circular blade of the cutter portion, depending on the direction of the mowing work Thus, when the position of the cutter portion is switched, the position of the contact portion of the guard body can also be switched. Thereby, for example, when performing a mowing operation along an obstacle, an accident in which the cutting blade of the cutter unit hits the obstacle can be suppressed, and safety for an operator or the like is improved.

  In addition, in the case of including an interval holding unit that can hold the interval between the cutter unit and the traveling road surface at a predetermined interval, the cutter unit and the traveling road surface are maintained at a predetermined interval. It is not necessary to pay attention to accidents that come into contact with workers, and the mental and physical burden on the worker is reduced. Here, the interval holding portion includes a damper type and a telescopic type that can adjust the interval as appropriate, in addition to a fixed interval such as a bar.

  Moreover, when the said space | interval holding | maintenance part has a wheel grounded on a driving | running | working road surface, since driving | running | working is smooth with a wheel, the height of a cutter part is maintained at a required space | interval, it is easy to work especially on a flat ground.

  In order to achieve the above object, the mowing method of the present invention has a plurality of cutting blades that are driven by a prime mover and protrude outwardly at the peripheral portion, and have the same rotation center. A self-propelled mower having a cutter part having an upper circular blade and a lower circular blade, one or both of which are stacked so that one or both of them are rotatable, and the upper and lower cutting blades can be sandwiched at a low speed. It is used to cut a plant that grows along the obstacle with each of the cutting blades while moving the guard body arranged outside the rotation trajectory of the cutting edge of the cutting blade against the obstacle.

  Here, since the mowing method of the present invention uses a self-propelled mower whose cutter is driven by a prime mover, the physical burden on the operator is reduced.

  Since one or both of the upper circular blade and the lower circular blade rotate at a low speed, the cutter unit used in the mowing method of the present invention is a cutter that cuts vegetation by rotating at high speed only in one direction. Compared to the conventional mowing method used, the occurrence of stepping stones can be suppressed, and the risk of stepping stones hitting an operator or the like can be reduced. In addition, since the cutter part cuts the target plant by the cutting blades of the upper circular blade and the lower circular blade, the cutter can be sufficiently cut even at low speed rotation.

  Moreover, a cutter support part supports a cutter part by connecting the said main-body part. Furthermore, since the cutter support part has a switching mechanism for the position of the cutter part, the position of the cutter part in the traveling direction of the main body part or in the left or right direction according to the position of the vegetation to be mowed. Can be switched. This makes it possible to mow the grass located on the left and right sides of the aircraft while the walking mower is running straight along the road shoulder.

  Since the guard body used in the mowing method of the present invention is arranged outside the rotation trajectory of the cutting edge of the cutting blade, each of the plants grown along the obstacle is moved while the guard body is moved against the obstacle. Mowing with a cutting blade. Thereby, when performing mowing work, the cutting edge of the cutter unit is prevented from hitting an obstacle, and an accident that the cutting edge hits the obstacle and the cutting edge is lost can be suppressed, so that the safety of the operator or the like is ensured.

According to the walking type mower according to the present invention, when performing mowing work on a portion along an obstacle, the occurrence of an accident such as a stepping stone hitting an operator or damage to a cutter caused by contact with the obstacle is suppressed. It is possible to reduce the mental or physical burden on the operator.
Further, according to the mowing method according to the present invention, when mowing a portion along an obstacle, the occurrence of an accident such as a stepping stone hitting an operator or damage to a cutter caused by contact with the obstacle is suppressed. It is possible to reduce the mental or physical burden on the operator.

It is a perspective view which shows the walk-type mower of this invention. It is bottom view explanatory drawing which showed the operation | movement direction of the cutter part and cutter support part of the walk-type mower shown in FIG. It is a perspective explanatory view which shows the operation | movement direction of the safety device of a walk-type mower shown in FIG. 1, a cutter part, and its operation lever. FIG. 2 is an explanatory perspective view showing an operation direction of an operation handle of the walking mower shown in FIG. 1. The cutter part of the walk-type mower shown in FIG. 1 is represented, (a) is an enlarged perspective explanatory view showing the operation of the cutter part, and (b) is an enlarged explanatory view showing the operation of the cutting blade part in the use state. It is. FIG. 3 is a plan view explanatory diagram illustrating an operation position of a guard body of the walking mower illustrated in FIG. 1 with an imaginary line. FIG. 2 illustrates a usage state of the walking mower illustrated in FIG. 1, wherein (a) is an explanatory diagram illustrating a state in which an operator walks on a roadway and performs an operation, and (b) an operator goes up to a sidewalk and performs an operation. It is explanatory drawing which shows the state to perform. FIG. 2 is an explanatory perspective view showing an operation direction of a vegetation removing unit of the walking mower shown in FIG. 1. It is the perspective view which showed the brush cutter of a nonpatent literature 1. It is the perspective view which showed the mop mower of a nonpatent literature 2.

  The embodiment of the present invention will be described in more detail with reference to FIGS. In addition, the code | symbol in each figure is attached | subjected within the range which reduces complexity and makes it easy to understand.

  A walking mower 1 shown in FIG. 1 includes a main body 2 having an operation handle 3, a cutter 4, a guard body 5 that protects the cutter 4, and a cutter support 6 that connects the cutter 4 and the main body 2. And a power transmission shaft (not shown) stored in the cutter support 6, each part will be described below.

  The power transmission shaft in the present embodiment corresponds to the aforementioned “transmission means for transmitting the power of the prime mover to the cutter unit”, and is stored in a support rod 61 of the cutter support unit 6 described later. However, the present invention is not limited to this. For example, it may be disposed outside the support rod 61, or a known power transmission means such as a belt or a chain may be employed.

  The main body 2 is provided on the frame 21, the prime mover 23, a traveling power transmission portion 231 disposed below the prime mover 23, a pair of traveling wheels 24 disposed on the side of the frame 21, and the rear side of the frame 21. And a direction switching lever portion 25 provided on the rear side of the frame 21 and below the operation handle 3.

  The frame 21 has a U-shape in a plan view in which a side (hereinafter referred to as “front side”) that is a traveling direction in the walking mower 1 is bent in an arc shape, the front side is the lowest position, and the rear side is the highest. It becomes a position, and the middle is formed in the shape which went up and inclined toward the back side (refer to Drawing 1-Drawing 4).

  Please refer to FIG. A plate-like attachment base 211 for attaching a support rod 61 of a cutter support 6 described later is provided at the bottom on the front side of the frame 21. The attachment base 211 has a rotation shaft 214 and a groove 212 formed on the front side of the walking mower 1 as viewed from the rotation shaft 214. The groove 212 is formed in an arc shape centered on the rotation shaft 214. A protrusion (not shown) protruding from the upper surface near the base end of the support rod 61 described later is inserted into the groove 212, and the direction of the cutter support portion 6 is horizontal by sliding along the groove 212. The direction can be switched. The rotating shaft 214 is a portion that is inserted into a base end of a cutter support portion 6 described later and is attached to the cutter support portion 6 so as to be rotatable in the horizontal direction.

  In the present embodiment, the groove 212 is cut out to a position of 45 ° to the left and right, with the center in the left-right direction (width direction) on the front side of the walking mower 1 being 0 °, but is not limited thereto. For example, it may be cut out to the left or right to a position of less than 45 ° or more than 45 °.

  On the rear side of the frame 21, a base-like operation handle mounting base 213 that rises upward from the frame 21 is formed.

  The prime mover 23 is mounted at the center of the frame 21, and a fuel tank 231 is disposed on the side thereof. The prime mover 23 supplies power to the traveling wheels 24 via the traveling power transmission unit 232 and supplies power to the cutter unit 4 via a power transmission shaft (not shown). In the present embodiment, the prime mover 23 is a gasoline engine. However, the prime mover 23 is not limited to this, and may be another prime mover such as an electric motor.

  The direction switching lever portion 25 is a portion into which the direction switching lever 251 whose base end is connected to one end of a link rod 26 described later, and the direction switching lever 251 is inserted, and a groove and a groove corresponding to the position of the cutter portion 4. A casing 252 having a plurality of locking recesses (all of which are omitted in the reference numerals) formed in an orthogonal direction is provided.

  The link rod 26 has one end connected to the direction switching lever 251 and the other end attached to the link plate 62. The link rod 26 moves forward and backward in accordance with the vertical movement of the direction switching lever 251, the movement direction is changed at the portion where the link plate 62 is attached, and the cutter support unit 6 to which the link plate 62 is attached is moved to the walking type mower 1. It is connected so that it can operate to the right and left sides in the horizontal direction with respect to the traveling direction (see FIGS. 2 and 3).

  The above-mentioned “switching mechanism capable of switching the position of the cutter unit in the traveling direction of the main body unit or any one of the left and right according to the position of the target plant” includes the direction switching lever unit 25, the link bar 26, a groove 212, and a link plate 62.

  The operation handle 3 has a handle shaft 31 and has a grip portion 32 formed at a right angle to the handle shaft 31 at an upper end thereof, and is formed in a substantially T shape. The operation handle 3 has a lower end portion of a handle shaft 31 attached to an operation handle attachment base 213 of the frame 21 via a handle angle adjustment unit 33. Thereby, the operation handle 3 is capable of adjusting the angle in the vertical direction around the lower end portion of the handle shaft 31.

  A clutch lever 34 is attached to the vicinity of the grip 32 so as to be rotatable at a required angle, and the clutch lever 34 controls the forward and backward movement of the walking mower 1. In the present embodiment, one side of the clutch lever 34 (the one that becomes the right hand side of the user when the walking mower 1 in FIG. 1 is used) is brought closer to the grip portion 32 side (the user grips it). ) And the other side of the clutch lever 34 (the one on the left hand side of the user when using the walking mower 1 in FIG. 1) is moved closer to the gripping portion 32 side (the user grips) and the vehicle moves backward. In addition, although the gear is switched, the present invention is not limited to this, and other clutch structures may be employed.

  The handle angle adjustment unit 33 includes a rail portion 331, a slider portion 332, and a cover 333. The rail portion 331 has a fan shape with a central angle of approximately 90 ° when viewed from the side, and an arc-shaped curved surface having a required width is arranged toward the operation handle 3 side. (Not shown) is formed (see FIG. 3).

  The slider portion 332 is a gate-shaped part attached to the lower end of the handle shaft 31, and the tip portion side is attached to the rail portion 331 via an attachment shaft (not shown), and the vertical direction is along the rail portion 331. (See FIGS. 3 and 4). The cover 333 is a member that covers the rail portion 331 and the slider portion 332, and has a structure in which the operation handle 3 side is opened so as not to hinder the operation of the rail portion 331 and the slider portion 332.

  When adjusting the vertical angle of the operation handle 3, the operation handle 3 including the slider portion 332 is set to a desired angle, and the operation handle is inserted into any hole (reference numeral omitted) formed on the side surface of the rail portion 331. An engaging pin (not shown) that is operated to enter and exit on the 3 hand side is projected and engaged. Thereby, the operation handle 3 can fix the position of the up-down direction to a predetermined angle. The engaging pin passes through a pipe (reference numeral omitted) provided at the base end of the handle shaft 31 and protrudes from the handle shaft 31 side to the rail portion 331 side.

  The rail portion 331 is attached to the operation handle attachment base 213 via a rotation shaft (not shown), so that the operation handle 3 and the handle angle adjustment portion 33 can be rotated in the horizontal direction (in other words, the operation handle 3 (See FIG. 4). In the present embodiment, the rail portion 331 is provided to be rotatable by 360 °, but the present invention is not limited to this, and the rotatable angle may be set as appropriate.

  A throttle portion 35 is provided at a position closer to the grip portion 32 than the longitudinal center of the handle shaft 31. The throttle unit 35 includes a throttle lever 351, a biasing member 352, and a cover 353.

  The movable direction of the throttle lever 351 is parallel to the longitudinal direction of the operation handle 3, and is provided so as to rise (or rotate) upward from the cover 353. The throttle lever 351 has a grip (not shown) substantially parallel to the grip portion 32 at the tip, and the base end is connected to a cable (not shown) for operating the throttle, and the throttle lever 351 is connected to the main body 2. The throttle is throttled when tilted in the direction, and the throttle is opened when the throttle lever 351 is tilted in the direction of the grip portion 32 (see FIGS. 1 and 3).

  The biasing member 352 is provided in a substantially T shape, and its upper part is formed in a semicircular tube parallel to the gripping part 32 so as to cover the gripping part 32 when contacted. A space between the handle shaft 31 and the like is formed in a box shape with an opening at the bottom. The urging member 352 is urged so that the base end portion is attached to the handle shaft 31 and rises (or rotates) in a direction away from the handle shaft 31 and the grip portion 32 by a spring (not shown). Yes. When the urging member 352 is raised, the back portion of the box-shaped portion is in contact with the grip (not shown) of the throttle lever 351, and is in the most raised state (in other words, farthest from the grip portion 32). In this state, the throttle lever 351 is adjusted to be pushed down to the most narrowed position (see FIGS. 1 and 3).

  The cover 353 is a member that covers the base end side portions of the throttle lever 351 and the urging member 352. The cover 353 has a groove (not shown) in which the throttle lever 351 moves, and a recess (not shown) in which a portion between the upper part or the base end side of the urging member 352 fits in a position parallel to the groove. It is formed (see FIGS. 1, 3, and 4).

  The cutter support unit 6 includes a support rod 61, a link plate 62, and an interval holding unit 63. The support rod 61 is a tubular body that connects the cutter unit 4 and the main body unit 2, and stores therein a power transmission shaft (not shown) that is a transmission unit that transmits the power of the prime mover 23 to the cutter unit 4. The link plate 62 is a plate attached to the body side end of the support rod 61, and the other end of the link rod 26 is connected as described above.

  The interval holding unit 63 is disposed at the center of the support rod 61, holds the interval between the support rod 61 and the traveling road surface at a required interval, and thus holds the interval between the cutter unit 4 and the traveling road surface at a required interval. It is. The interval holding part 63 is disposed on the wheel 631 that contacts the road surface, a stay 632 that is pivotally supported by the wheel 631, and an upper part of the stay 632 that expands and contracts in the height direction and has a height at an appropriate position. It consists of an interval adjustment section 633 that can be fixed.

  In the present embodiment, the interval adjusting unit 633 is a nesting type composed of an outer tube and an inner tube, and the positions of the holes formed in the outer tube and the inner tube are aligned to insert a pin or bolt to fix the position. However, the present invention is not limited to this structure. For example, a known elastic member such as a slide member may be employed.

  The cutter unit 4 is attached to the tip of the support rod 61, and includes an upper circular blade 41, a lower circular blade 42, a speed reducer 43, and a vegetation removing unit 44.

  The upper circular blade 41 has a plurality of cutting blades 411 protruding outward at the edge of the disc. Each of the cutting blades 411 has a substantially trapezoidal shape, and a space between adjacent cutting blades is about the width of one cutting blade, and is formed in a so-called gear shape in a plan view. Each cutting blade 411 is a single blade (see FIGS. 1 to 5, particularly FIG. 5).

  The lower circular blade 42 has a plurality of cutting blades 421 protruding outward at the edge of the disc. Each of the cutting blades 421 has a substantially trapezoidal shape, and a space between adjacent cutting blades is about the width of one cutting blade, and is formed in a gear shape in a plan view. Each cutting blade 421 is a single blade (see FIGS. 1 to 5, particularly FIG. 5).

  The reduction gear 43 includes a first reduction gear portion 431 and a second reduction gear portion 432. The first reduction gear portion 431 is disposed between the distal end portion of the support rod 61 and the second reduction gear portion 432, and temporarily reduces the rotational input from the prime mover 23 via the power transmission shaft (decelerates the rotational speed). It is configured as follows.

  The second reduction gear portion 432 is disposed between the first reduction gear portion 431 and the upper surface of the upper circular blade 41, transmits power from the first reduction gear portion 431, and rotates from the first reduction gear portion 431. The input is secondarily reduced (the rotational speed is reduced) (see FIG. 5A). Further, the second reduction gear portion 432 is configured to transmit power to the upper circular blade 41 and the lower circular blade 42 and rotate the upper circular blade 41 and the lower circular blade 42 in opposite directions.

  The speed reducer 43 sets the engine rotation input at the power transmission shaft to 10,000 rpm, the first reduction gear portion 431 reduces the speed to 2,700 rpm, and the second reduction gear portion 432 further reduces the speed to 500 rpm.

  The upper circular blade 41 and the lower circular blade 42 are overlapped so that the rotation centers of the upper circular blade 41 and the lower circular blade 42 are the same, and the direction of the cutting blade 411 and the direction of the cutting blade 421 face each other. It is piled up. Further, the upper circular blade 41 and the lower circular blade 42 are configured such that the rotational speed of the upper circular blade 41 and the lower circular blade 42 is reduced via the speed reducer 43, and the upper circular blade 41 and the lower circular blade 42 are rotated in reverse directions (FIG. 5A). And (b)). Thereby, the cutter unit 4 can sandwich the plant G to be cut with the upper and lower cutting blades at a low speed (see FIG. 5B).

  The vegetation removing unit 44 is composed of a horizontal part and a vertical part (both of which are omitted), one horizontal part is attached in the vicinity of the cutting edge 411 on the upper surface of the upper circular blade 41, and the vertical part is above the upper circular blade 41. It is a member protruding like a tongue. The vegetation removing unit 44 rotates as the upper circular blade 41 rotates.

  In the present embodiment, the vegetation removal unit 44 is the above-described embodiment, but is not limited to this. For example, the vertical portion may be a rod-like shape, and a plurality of vegetation removal units 44 are provided. Furthermore, the base end of the vegetation removing part 44 may be integrated by being fixed to the upper surface of the upper circular blade 41. In short, the vegetation after cutting that covers the cutter part 4 can be removed. I just need it.

  The guard body 5 will be described with reference to FIG. The guard body 5 includes a first stay 51, a second stay 52 attached to the upper surface of the first stay 51, a contact portion 521 attached to the tip of the second stay 52, and an upper surface of the second stay 52. A third stay 53 to be attached, a contact roller 531 attached to the tip of the third stay 53, and a fastening bolt for fixing the overlapping position of the first stay 51, the second stay 52 and the third stay 53 54.

  The first stay 51 is a T-shaped plate body having a flat upper surface, and a base end is fixed to an upper portion of the first reduction gear portion 431 and is arranged so that a distal end is positioned in the left-right direction.

  Near the distal end of the first stay 51 in the left-right direction, first mounting holes 511 are provided. Note that a nut (not shown) to which the fastening bolt 54 can be screwed is welded to the edge of the first mounting hole 511 on the lower surface of the first stay 51.

  A second mounting hole 512 is provided at each intermediate position of the first mounting hole 511 and on the axis of rotation center of the upper circular blade 41 and the lower circular blade 42.

  The second stay 52 is a flat plate body, and includes a horizontal portion that is arranged on the upper surface of the first stay 51 and a hanging portion that hangs downward from the tip of the horizontal portion.

  In the longitudinal direction of the horizontal portion of the second stay 52, one end side is located on the axis of rotation center of the upper circular blade 41 and the lower circular blade 42, and the other end side is rotation of the cutting edges of the cutting blade 411 and the cutting blade 421. It is formed to a length located outside the locus. A third mounting hole 522 is provided in the vicinity of one end of the horizontal portion of the second stay 52 described above.

  Further, the horizontal portion of the second stay 52 has protruding portions on both sides in the short direction, and a plurality of (four in total in the present embodiment) fourth mounting holes are provided at a required interval. 523 is provided.

  The hanging portion of the second stay 52 is provided with a length such that the tip thereof is slightly higher than the upper surface of the upper circular blade 41, and a fifth attachment hole 524 is provided at the tip. A nut (not shown) to which a bolt can be screwed is welded to the mouth of the rear surface side of the fifth mounting hole 524 (the horizontal portion side of the second stay 52 in FIG. 5).

  The abutting portion 521 includes a portion that hits an obstacle and its attaching means, and includes a round bar-like abutting portion and an attaching portion to the plate-like second stay 52 provided with holes. The contact portion 521 is attached to the second stay 52 by aligning the positions of the above-mentioned hole and the fifth attachment hole 524 and inserting and fastening a bolt from the direction of the attachment portion of the contact portion 521. Yes. In addition, even if the contact roller 521 contacts the obstacle and prevents the cutting blades 411 and 421 from coming into contact, the contact portion 521 causes the cutting blades 411 and 421 to be obstructed by the unstable movement of the walking mower 1. This is an auxiliary protective member that prevents objects from coming into contact.

  The first stay 51 and the second stay 52 are inserted through the mounting shaft 55 with the positions of the second mounting hole 512 and the third mounting hole 522 aligned, so that the upper surface of the first stay 51 is covered. The second stay 52 can be rotated so as to slide. That is, the combination of the first stay 51 and the second stay 52 corresponds to the above-described “adjustment mechanism that can adjust the position of the abutting portion according to the cutting side of the cutter portion.

  The third stay 53 is a substantially T-shaped plate body, and a contact roller 531 is attached to the tip portion so as to be rotatable in the horizontal direction, and is a portion protruding in the lateral direction opposite to the tip direction. A plurality of sixth mounting holes 532 (5 in total in the present embodiment) that are arranged in parallel with a predetermined interval are provided (see FIG. 5A).

  The fastening bolt 54 has a lever 541 provided on the head in a direction intersecting the axial direction of the bolt, and the diameter of the head is formed larger than the width of the sixth mounting hole. The lever 541 is used to apply torque without a tool when the fastening bolt 54 is tightened or loosened.

  The second stay 52 and the third stay 53 are overlapped so that the contact portion 521 of the second stay 52 and the contact roller 531 of the third stay 53 are in the same direction. Align any of the second mounting holes 512, any of the fourth mounting holes 523 of the second stay 52, and any of the sixth mounting holes 532 of the third stay 53, and tighten them. By tightening the landing bolt 54, the direction of the guard body 5 is fixed.

  The fastening bolt 54 is loosened and pulled out, and the second stay 52 is slid and rotated in the opposite direction to the above-mentioned direction, so that the contact portion 521 of the second stay 52 and the third stay 53 contact each other. The second stay 52 and the third stay 53 are overlapped so that the rollers 531 are in the same direction, and the second mounting hole 512 of the first stay 51 and the fourth stay of any one of the second stays 52 are arranged. By aligning the positions of the mounting holes 523 and the sixth mounting holes 532 of any of the third stays 53 and tightening the fastening bolts 54, the guard body 5 is fixed to the opposite side to the aforementioned direction.

(Work)
The operation of the walking mower 1 will be described with reference to FIGS. 1 to 8 (particularly FIGS. 7 and 8). The walk-type mower 1 can also perform a normal mowing operation in which the cutter unit 4 faces the front in the traveling direction, but the cutter unit 4 is switched to either the left or right direction with respect to the traveling direction to obstruct the obstacle. The mowing work performed along the line will be mainly described.

(Preliminary work)
Before starting the work, check whether the obstacle and the position of the plant G that grows along this are on the left or right side of the direction of travel of the walking mower 1, and adjust the direction of the cutting edges 411, 412 of the cutter unit 4 To do. At the same time, it is set so that the contact portion 521 and the contact roller 531 are positioned at the tip of the cutter portion 4 (outside the rotation locus).

  Referring to FIG. 7A, since it is the right side of the traveling direction of the walking mower 1, the operator U moves the direction switching lever 251 to cut the cutter unit 4 to a desired angle on the right side. The direction of the blade is adjusted (see FIGS. 2, 3, and 7). At the same time, the direction of the second stay 52 and the third stay 53 is switched and adjusted so that the contact portion 521 and the contact roller 531 are located on the right side in the traveling direction of the walking mower 1.

  Furthermore, the operator U adjusts the handle angle so as to obtain an appropriate angle by using the handle angle adjusting unit 33 in order to set the height of the operation handle 3 so that the work can be easily performed according to the height. . Furthermore, the operator U adjusts the height of the interval holding unit 63 by using the interval adjustment unit 633 so that the height of the traveling road surface on which the operation is performed and the height of the cutter unit 4 are maintained at a required interval. To do.

(Working)
The worker U starts the prime mover 23 and starts work.

  The operator U brings the urging member 352 close to the gripping portion 32 and grips the urging member 352 so as to cover the gripping portion 32, and also grips the clutch lever 34 in the forward direction.

  Since the urging member 352 is brought closer to the gripping portion 32, the throttle lever 351 is not urged. Therefore, the throttle lever 351 can be tilted in the direction of the gripping portion 32, so that the throttle lever 351 can reach any travel speed (output). Can be opened. The throttle lever 351 controls both the rotational speed of the cutter unit 4 and the traveling speed of the walking mower 1, and is set so that the rotational speed of the cutter unit 4 increases as the traveling speed of the walking mower 1 increases. Has been.

  Reference is made to FIG. The worker U uses the walking mower 1 to cut the grass G that grows on the road. Grass G often thrives on block B (corresponding to the obstacles mentioned above), which is the boundary between the roadway and the sidewalk, and if the conventional mop mower 9 is used, there will be uncutting or re-cutting. In addition, when using the brush cutter 8 which is a mower, there is an accident caused by the rotary blade 83 coming into contact with the block wall surface B1 of the block B (the chipped blades are scattered, the worker with a kickback action) There was a risk of injury).

  However, according to the walk-type mower 1, the abutting portion 521 of the guard body 5 located outside the rotation trajectory of the cutting edge of the cutting blade is present, so that the cutter portion 4 is made to follow the block wall surface B1. Even when grass cutting work is performed, it is possible to suppress an accident in which the cutting blades 411 and 421 of the cutter unit 4 hit the block wall surface B1, and safety to the worker U or the like is ensured.

  In addition, the cutter unit 4 is blocked by adjusting the contact roller 531 so that it protrudes toward the block wall surface B1 rather than the contact unit 521 so that the contact unit 521 does not directly contact the block wall surface B1. The movement along the wall surface B1 becomes smooth. At this time, the contact roller 531 functions as a guide member along the block wall surface B1, and the contact portion 521 serves as a preliminary protection means for preventing the cutting edges 411 and 421 from coming into contact with the block wall surface B1. . The contact roller 531 can be adjusted using the sixth mounting hole 532 of the third stay 53 that is a long hole.

  Since both the upper circular blade 41 and the lower circular blade 42 rotate at a low speed, the cutter unit 4 is compared with a conventional mower cutter that cuts vegetation by rotating at high speed only in one direction. Thus, generation of stepping stones can be suppressed. Thereby, the danger that a stepping stone will hit the worker U or the like can be reduced. In addition, since the cutter unit 4 sandwiches the plant G by the cutting blades 411 and 421 of the upper circular blade 41 and the lower circular blade 42, the cutter unit 4 can sufficiently cut the plant G even at low speed rotation. Can do.

  Further, according to the walking mower 1, the horizontal angle of the operation handle 3 can be adjusted to a required angle by the handle angle adjusting unit 33, so that the walking mower 1 is connected to the roadway as shown in FIG. Even while traveling on the side, the operator U can perform an operation to control while walking on the sidewalk side, and the safety of the worker U is improved.

  During the mowing operation, as shown in FIG. 8, the cut vegetation G <b> 1 may cover the cutter unit 4, but is covered by the vegetation removal unit 44 that rotates as the upper circular blade 41 rotates. The covered plant G1 is removed like the plant G2. That is, according to the walk-type mower 1, it is not necessary to manually remove the vegetation G1 covered and covered, so that workability is good.

  Since the walking mower 1 is a self-propelled type in which the traveling wheel 24 and the cutter unit 4 are driven by the prime mover 23, the physical burden on the operator is reduced.

  Moreover, since the distance between the cutter unit 4 and the traveling road surface is maintained at a predetermined interval by the interval holding unit 63, the walking mower 1 is careful to prevent accidents in which the cutter unit 4 contacts the traveling road surface. It is not necessary to pay, and the mental or physical burden on the worker U is reduced. In addition, since the running is smooth by the running wheels 24, it is easy to work especially on flat ground.

  Further, since the walking mower 1 can adjust the positions of the contact portion 521 and the contact roller 531 of the guard body 5 according to the working direction as described above, the cutter portion 4 is adapted to follow the block wall surface B1. Even when grass cutting work is performed, an accident in which the cutting edges 411 and 421 of the cutter unit 4 hit the block wall surface B1 can be suppressed, and safety to the worker U and the like is improved.

  Even if there is some trouble such as the operator U whispering, the walking mower 1 rises in the direction in which the urging member 352 is separated from the gripping portion 32 if the hand is separated from the urging member 352 and the gripping portion 32. Since the throttle lever 351 is returned (or turned) and the throttle is throttled, the travel stops and the rotation of the cutter unit 4 also stops, so that the safety of the operator and the like is high.

  After the work is completed, when the worker U releases his / her hand from the gripping portion 32, the urging member 352 rises and separates from the gripping portion 32. At this time, due to the urging force generated in the urging member 352, the back portion of the urging member 352 comes into contact with the lever of the throttle lever 351, and the throttle lever 351 is pushed down to the most contracted position. That is, when the operator U releases his hand from the grip portion 32, both the rotation of the cutter unit 4 and the traveling of the walking mower 1 are stopped.

  In the walking mower 1, the rail portion 331 of the handle angle adjusting unit 33 is provided so as to be able to rotate 360 °. Therefore, when storing, the operation handle 3 is turned to the main body unit 2 side to move the operation handle 3 in the vertical direction. By adjusting the angle to the lowest, the size of the walking mower 1 in the full length direction and the height direction can be reduced, so that the storage space can be reduced.

  Since the contact portion 521 can be detached from the second stay 52, only this part needs to be replaced when worn. Similarly, the contact roller 531 can also be removed from the third stay 53, so that when worn, only this part needs to be replaced.

  In the present embodiment, the guard body 5 includes the third stay 53 and the contact roller 531, but is not limited thereto. For example, the third stay 53 and the contact roller 531 are provided. It can also be set as the aspect which removed. In this case, the trouble of adjusting the position of the contact roller 531 can be saved.

  The terms and expressions used in the present specification and claims are for illustrative purposes only, and are not intended to be limiting in any way. The features described in the present specification and claims and their There is no intention of excluding some equivalent terms and expressions. It goes without saying that various modifications are possible within the scope of the technical idea of the present invention.

DESCRIPTION OF SYMBOLS 1 Walking type mower 2 Main part 21 Frame 211 Mounting base 212 Groove 213 Operation handle mounting base 214 Rotating shaft 23 Motor 231 Fuel tank 232 Driving power transmission unit 24 Driving wheel 25 Direction switching lever unit 251 Direction switching lever 252 Casing 26 Link Rod 3 Operation handle 31 Handle shaft 32 Gripping part 33 Handle angle adjusting part 331 Rail part 332 Slider part 333 Cover 34 Clutch lever 35 Throttle part 351 Throttle lever 352 Energizing member 353 Cover 4 Cutter part 41 Upper circular blade 411 Cutting blade 42 Lower circular Blade 421 Cutting blade 43 Reduction gear 431 First reduction gear part 432 Second reduction gear part 44 Plant removal part 5 Guard body 51 First stay 511 First attachment hole 512 Second attachment hole 52 Second stay 52 DESCRIPTION OF SYMBOLS 1 Contact part 522 3rd attachment hole 523 4th attachment hole 524 5th attachment hole 53 3rd stay 531 Contact roller 532 6th attachment hole 54 Fastening bolt 55 Attachment shaft 6 Cutter support part 61 Support棹 62 Link plate 63 Interval holding portion 631 Wheel 632 Stay 633 Interval adjustment portion G, G1, G2 Plant B Block B1 Block wall surface 8 Brush cutter 81 Primer 82 Operation rod portion 821 Operation handle 83 Rotating blade 9 Mop mower 90 Car chassis 91 Engine 92 Frame 93 Wheel 94 Handle 95 Cutting blade 951 Cover 96 Connection part

Claims (8)

A main body having a prime mover, a traveling wheel driven by the prime mover, and an operation handle including a gripping portion;
Each has a plurality of cutting edges projecting outward from the peripheral edge, and the rotation centers are the same so that one or both can be rotated, and the target plant is sandwiched between the upper and lower cutting edges A cutter portion having an upper circular blade and a lower circular blade that are adapted to be cut;
A cutter support section having a switching mechanism that connects the cutter section and the main body section and can switch the position of the cutter section from the traveling direction of the main body section to either the left or right direction according to the position of the target plant. When,
Transmission means for transmitting the power of the prime mover to the cutter unit;
A speed reducer that reduces the rotational speed of the upper circular blade or the lower circular blade between the prime mover and the cutter unit at a required reduction ratio;
An abutting portion that is located outside the rotation trajectory of the cutting edge of the cutting blade and is capable of abutting along an obstacle near the target plant, and is arranged in the same direction as the corresponding contacting portion, and rotates in a horizontal direction. A walking type mower comprising a guard body having a contact roller that is movable and adjusted so as to protrude from the contact portion . A biasing member that is provided with a throttle of the prime mover on the operation handle and is urged in a direction to squeeze the throttle, and moves to squeeze the throttle by separating from the gripping portion by a biasing force from a position close to the gripping portion of the operation handle. The walking mower according to claim 1. The walking-type grass mower according to claim 1, further comprising a handle angle adjustment unit that can adjust a horizontal angle of the operation handle to a required angle. The plant according to claim 1, 2, or 3, further comprising a vegetation removing unit that is provided on an upper surface of the upper circular blade, protrudes above the upper circular blade, and rotates with the rotation of the upper circular blade. The described walking mower. The adjustment mechanism which can adjust the position of the contact part of the said guard body according to the side which cut | disconnects the vegetation of the said upper circular blade and the said lower circular blade of the said cutter part is provided. Or the walk-type mower according to claim 4. The walking-type grass mower according to claim 1, 2, 3, 4, or 5, further comprising an interval holding portion capable of holding an interval between the cutter portion and the traveling road surface at a predetermined interval. The walking type mower according to claim 6, wherein the interval holding unit includes a wheel that contacts the road surface. The upper and lower cutting blades are driven by a prime mover and have a plurality of cutting blades protruding outward at the peripheral edge, and one or both of them can be rotated so that their rotation centers are the same. Using a self-propelled grass mower having a cutter portion having an upper circular blade and a lower circular blade that can cut the target vegetation at a low speed, and arranged outside the rotation trajectory of the cutting edge of the cutting blade. And a contact portion that can be contacted along an obstacle in the vicinity of the target plant, and is arranged in the same direction as the corresponding contact portion, can be rotated in the horizontal direction, and protrudes from the contact portion. A mowing method in which a cutting body is cut with the same cutting blade while moving a guard body having an abutting roller adjusted and attached to the obstacle.

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