JP3201912U - Mower - Google Patents

Abstract

[PROBLEMS] To provide a mowing machine in which a mowing grass that has been trimmed without hindering the impact mitigation due to the rotation of the centrifugal blade does not have a risk of being wound around a revolving arm that supports the centrifugal blade or a drive shaft that rotationally drives the arm. Means: An anti-winding cover 1 comprising an upper cover member 3 covering the upper part of the turning area of the turning arm 7 and a lower cover member 4 provided so as to cover the lower part of the turning area and rotated together with the turning arm 7 is provided. It was. The lower cover member 4 is provided between the outer peripheral portion thereof and the outer peripheral portion of the upper cover member 3 so as not to interfere with the centrifugal blade 5, and includes a plurality of first shaft cover portions 6a partially covering the periphery of the drive shaft. A plurality of second shaft cover portions 6b provided so as not to interfere with the centrifugal blade 5 behind the centrifugal blade 5 between the mutually adjacent edges 6c of the first shaft cover portion 6a. [Selection] Figure 2

Description

  The present invention relates to a mower that cuts grass such as weeds and turf with a cutting blade (hereinafter referred to as a centrifugal blade) that protrudes in a radial direction due to centrifugal force during rotation, and in particular, prevents winding of the cut grass that occurs during mowing. The present invention relates to a mower having a winding prevention cover. In the present invention, the mower is a portable type equipped with a driving source and used by an operator to hold in his hand or from his shoulder, such as a hand-held or self-propelled lawn mower. This refers to all devices that cut grass such as weeds and turf with a centrifugal blade.

  Conventionally, a circular saw or a plate-like blade is generally used as a cutting blade of a mower. These cutting blades are usually fixed directly to the drive shaft, so if they come into contact with a hard object such as concrete or stone during the mowing operation, the operator may fall down due to a strong impact or the cutting blade itself may be damaged. Or

  In order to cope with this problem, Patent Document 1 proposes a mowing machine in which several centrifugal blades are rotatably attached between two rotating plates.

  By the way, in Patent Document 2, as a brush cutter using a nylon cord, a flexible linear blade such as a nylon cord protrudes outward at the tip of a drive shaft that is rotationally driven by a power source such as a motor or a fuel engine. In a brush cutter that attaches a linear blade rotation unit that has been removed and cuts weeds and the like by rotating the cutting blade, the linear blade rotation unit is provided with a cylindrical structure that prevents foreign matter from entering the part where the foreign matter is entangled. A brush cutter is listed.

JP-A 51-55086 JP 2012-29668 A

  In the prior art described in Patent Document 1, weeds and the like can be mowed by the centrifugal blade protruding from the outer periphery of the rotating plate by centrifugal force during rotation during normal mowing work, such as concrete or stone When it comes into contact with a hard object, the centrifugal blade naturally rotates and retreats so that the impact can be reduced.

  However, in the above configuration, although the upper surface and the lower surface of the centrifugal blade are covered with the rotating plate, there is a gap on the side surface for the convenience of sandwiching the centrifugal blade therebetween. For this reason, there is a risk that mowing grass that has been cut away from the gaps on the side surface will enter and get stuck inside or wound around the drive shaft, causing a load on the drive system or, in the worst case, stopping the rotating plate. is there.

  On the other hand, in the mower described in Patent Document 2, since the entire outer peripheral side surface of the cylindrical structure is covered with the cover except for the gap for the cutting blade to protrude, there is no possibility that the mowing grass will enter the cover. Therefore, at first glance, if the configuration of this cylindrical structure is applied to the mower described in Patent Document 1, the above problem seems to be solved.

  However, the above configuration is based on the premise of using a cutting blade such as a nylon cord that requires a minimal gap provided on the side surface to protrude outwardly, and rotates around as described in Patent Document 1. It is not possible to apply the above-described cylindrical structure as it is to a mower using a centrifugal blade that requires a sufficient gap because the mowing grass may enter through the gap. Therefore, the technique described in Patent Document 2 is not a means for solving the problems of the technique described in Patent Document 1.

  The present invention was devised in view of the above circumstances, and the mowing grass that has been trimmed without interfering with the relaxation of the impact caused by the rotation of the centrifugal blade is used as a turning arm that supports the centrifugal blade and a drive shaft that rotationally drives it. An object of the present invention is to provide a mower having no risk of winding.

  In order to solve the above-described problem, a mower according to the invention of claim 1 includes a drive source, a drive shaft rotated by the drive source, a swivel arm attached to the drive shaft, and the swivel arm. In the mower provided with a plurality of centrifugal blades, one end of which is pivotally attached and pivoted by a centrifugal force generated by the rotation of the swivel arm and projecting in the extending direction of the swivel arm. An anti-winding cover comprising an upper cover member that covers the upper part of the swivel region of the arm, and a lower cover member that is fixed to the drive shaft so as to cover the lower part of the swivel region of the swivel arm and rotates together with the swivel arm The lower cover member of the anti-winding cover is provided between the outer periphery of the lower cover member and the outer periphery of the upper cover member so as not to interfere with the centrifugal blade, Partially around A plurality of first shaft cover portions and between the adjacent edges of the first shaft cover portions are provided behind the centrifugal blade so as not to interfere with the centrifugal blade, and around the drive shaft, And a plurality of second shaft cover portions covering a portion not covered with the first shaft cover portion.

  According to the mower having the above-described configuration, the drive shaft and the swivel arm attached to the drive shaft are covered with the anti-winding cover, and the first shaft cover portion of the lower cover member of the anti-winding cover and the first Since the biaxial cover part is provided so as not to interfere with the centrifugal blade, the turning operation of the centrifugal blade is not hindered by the anti-winding cover when mowing, and the mowing grass is attached to the drive shaft and the swivel arm. There is no risk of entanglement, and mowing work can be performed smoothly.

  According to a second aspect of the present invention, there is provided a mowing machine having a drive source, a drive shaft rotated by the drive source, a swivel arm attached to the drive shaft, and one end portion pivotable on the swivel arm. A mower provided with a plurality of centrifugal blades pivotally attached and rotated by a centrifugal force generated by the rotation of the swivel arm and projecting in an extending direction of the swivel arm; An upper cover member for covering, a lower cover member rotatably attached to the drive shaft so as to cover a lower portion of a swivel region of the swivel arm, and a space between the upper cover member and the lower cover member fixed to the drive shaft An anti-winding cover composed of a shaft cover member that rotates together with the drive shaft in a state in which the space is closed, and the shaft cover member of the anti-winding cover includes an outer peripheral portion of the lower cover member, Top cover A plurality of first shaft cover portions that are arranged at locations that do not interfere with the centrifugal blade between the outer peripheral portions of the material and partially cover the periphery of the drive shaft, and ends adjacent to each other of the first shaft cover portions A plurality of second shaft cover portions that are provided behind the centrifugal blades so as not to interfere with the centrifugal blades between edges, and cover a portion of the periphery of the drive shaft that is not covered by the first shaft cover portion; It is characterized by including.

  According to the mower having the above-described configuration, the drive shaft and the swivel arm attached to the drive shaft are covered with the anti-winding cover, and the first shaft cover portion of the lower cover member of the anti-winding cover and the first Since the biaxial cover part is provided so as not to interfere with the centrifugal blade, the turning operation of the centrifugal blade is not hindered by the anti-winding cover when mowing, and the mowing grass is attached to the drive shaft and the swivel arm. There is no risk of entanglement, and mowing work can be performed smoothly. In addition, since the lower cover member and the shaft cover member are separate, only the most fragile lower cover member among the anti-winding covers can be replaced with a new one, so that the cost of replacing parts can be reduced. it can.

  According to the present invention, the cutting operation of the centrifugal blade is not hindered by the anti-winding cover when mowing, and there is no risk of the mowing grass getting entangled with the drive shaft or the swing arm, so that the mowing operation can be performed smoothly. Machine can be provided.

1 is a front view showing an embodiment of a mower according to the present invention. It is a perspective view which shows the principal part of the mower shown in FIG. It is a disassembled perspective view which shows the principal part of the mower shown in FIG. It is a top view which shows the winding prevention cover of the mower shown in FIG.

  Hereinafter, as an embodiment of the present invention, an example in which the present invention is applied to a portable mower will be described with reference to the drawings.

  FIG. 1 is a front view showing a mower, FIG. 2 is a perspective view showing the main part of the mower, FIG. 3 is an exploded perspective view showing the main part of the mower, and FIG. 4 shows a winding prevention cover. It is a top view.

  The mower 100 includes an operating rod 20, a drive source (not shown), a drive shaft 2 rotated by the drive source, a swivel arm 7 attached to the drive shaft 2, and a swivel arm 7. One end portion is pivotally attached, and the two centrifugal blades 5 and 5 projecting in the extending direction of the swivel arm 7 by rotating by the centrifugal force generated by the rotation of the swivel arm 7, and the drive shaft 2 And a winding prevention cover 1 for preventing the grass from being wound around the revolving arm 7.

  The operation rod 20 is provided with a drive source case 10 incorporating a drive source at the front end thereof, and a rear handle 22 provided with an operation switch 23 for starting and stopping the drive source at the rear end portion. In addition, a front handle 21 is provided in the vicinity of the rear handle 22. The operating rod 20 may be provided with a shoulder belt so that carrying and mowing work can be easily performed.

  As a driving source, for example, an electric motor driven by a battery attached to the rear handle 22, a small engine using fuel oil, and the like, which is light in weight suitable for carrying that has been widely used in this type of mower conventionally. Is adopted.

  The drive shaft 2 has a base end portion connected to the drive source, and a distal end portion protruding from the lower end surface of the drive source case 10. As shown in FIG. 3, a small-diameter portion 2a is provided at the tip of the tip portion, and a fitting convex portion 2b having an irregular cross section is provided on the tip surface of the small-diameter portion 2a. Further, a female screw hole 2c is formed in the front end surface of the fitting convex portion 2b.

  As shown in FIG. 3, the swivel arm 7 extends in the opposite direction from the drive shaft mounting portion 7b having the same outer shape as that of the small diameter portion 2a of the drive shaft 2 and the periphery of the drive shaft mounting portion 7b. And a pair of centrifugal blade mounting rods 7c, 7c. In the center of the drive shaft mounting portion 7b, a fitting hole 7a having a shape that matches the fitting convex portion 2b of the drive shaft 2 is provided. As described above, the fitting convex portion 2b of the drive shaft 2 has an irregular cross section, and the shape of the fitting hole 7a matches this, so that the rotational force of the drive shaft 2 is not exhausted. Is transmitted to. Further, female screw holes (not shown) for screwing with the pivotal screws 15 and 15 for pivotally mounting the centrifugal blades 5 and 5 are provided at the distal ends of the centrifugal blade mounting rods 7c and 7c.

  The base ends of the two centrifugal blades 5 and 5 are pivotally attached to the respective distal ends of the centrifugal blade mounting rods 7c and 7c of the swivel arm 7 by pivotal screws 15 and 15, respectively. Yes. These centrifugal blades 5 and 5 are made of steel, are tapered, and both side edges are blades. The blades do not need to be provided on both side edges of the centrifugal blades 5 and 5, and may be provided only on the side edges facing the rotation direction of the swivel arm 7. In the illustrated example, the centrifugal blades 5 and 5 are pivotally attached to the lower surface side of the swivel arm 7, but are not limited thereto, and may be pivotally attached to the upper surface side. Further, the number of the centrifugal blades 5 is not necessarily two, and may be three or more. In that case, the number of the centrifugal blade mounting rods 7c of the swivel arm 7 is set to be equal to the number of the centrifugal blades 5, and the intervals between the centrifugal blade mounting rods 7c may be evenly arranged. That is, when there are three centrifugal blades 5, the three centrifugal blade mounting rods 7 c are arranged 120 degrees apart around the drive shaft mounting portion 7 b, and when there are four centrifugal blades, four centrifugal blade mounting rods are provided. 7c is arranged around the drive shaft mounting portion 7b with a separation of 90 degrees.

  As shown in FIGS. 3 and 4, the winding prevention cover 1 is fixed to the upper cover member 3 that covers the upper part of the turning area of the turning arm 7 and the drive shaft 2 so as to cover the lower part of the turning area of the turning arm 7. The lower cover member 4 is rotated together with the swivel arm 7.

  The upper cover member 3 is sized to cover the vicinity of the tip of the swivel arm 7, and a guard for ensuring the safety of the operator's feet from the outer peripheral edge of the outer peripheral edge that faces the operator during mowing work. The member 8 is integrally extended. The guard member 8 includes an upper surface plate 8a that is integrally connected to the upper cover member 3, and a peripheral surface plate 8b that hangs downward from the leading edge of the upper surface plate 8a. The size is such that it does not interfere with the tips of the centrifugal blades 5 and 5 swung by the arm 7. Further, an insertion hole 3a through which the drive shaft 2 is inserted is provided at the center of the upper cover member 3, and an annular or arcuate mounting wall portion 3b attached to the distal end portion of the drive source case 10 is inserted therethrough. It is formed to rise from the peripheral edge of the hole 3a.

  As shown in FIG. 4, the lower cover member 4 includes a disk-shaped substrate 4 a that covers the lower part of the swivel region of the swivel arm 7 and two first shaft cover portions 6 a and 6 a that partially cover the periphery of the drive shaft 2. And two second shaft cover portions 6b and 6b that cover portions around the drive shaft 2 that are not covered with the first shaft cover portions 6a and 6a.

  In the center of the substrate 4a, a fitting hole 4b having a shape that matches the fitting convex portion 2b of the drive shaft 2 is provided, and the fitting wall portion 4c that fits the small diameter portion 2a of the driving shaft 2 is on the upper surface side. In addition, a spring washer 13 for fixing the swivel arm 7 and the lower cover member 4, a washer 14, and a recessed portion 4 d for receiving the fixing screw 12 are formed on the lower surface side so as to surround the fitting holes 4 b, respectively. A pair of screws 15 and 15 for pivotally attaching the centrifugal blades 5 and 5 to the swivel arm 7 can be attached to and detached from the outer peripheral portion of the substrate 4a without removing the lower cover member 4. Through-holes 4e, 4e are female screw holes (not shown) of the centrifugal blade mounting rods 7c, 7c of the swivel arm 7 at intermediate positions between the adjacent edges 6c, 6c of the first shaft cover portions 6a, 6a. Z)).

  The first shaft cover portions 6a and 6a are formed in an arc shape along the outer peripheral portion of the substrate 4a, and are formed to rise from the outer peripheral portion of the substrate 4a so as not to interfere with the centrifugal blades 5 and 5. The second shaft cover portions 6b, 6b are formed in an arc shape having a radius slightly larger than the turning radius of the centrifugal blades 5, 5, and between the adjacent edges 6c, 6c of the first shaft cover portions 6a, 6a. In FIG. 3, the substrate is raised from the upper surface of the substrate 4a so as not to interfere with the centrifugal blades 5 and 5 behind the centrifugal blades 5 and 5. The first shaft cover portions 6a and 6a and the second shaft cover portions 6b and 6b are both formed integrally with the substrate 4a.

  The wrapping prevention cover 1 thus formed is molded of synthetic resin so as to contribute to weight reduction. The material of the wrapping prevention cover 1 is not limited to a synthetic resin, and may be a metal. Further, the material of the upper and lower cover members 3 and 4 may be different, for example, the lower cover member 4 which is likely to come into contact with the ground during mowing work is made of metal and the upper cover member 3 is made of synthetic resin.

  As described above, the upper cover member 3 of the wrapping prevention cover 1 is fixed to the distal end portion of the drive source case 10 by the fixing screw 16 via the mounting wall portion 3b, while the lower cover member 4 is connected to the drive shaft. The centrifugal blades 5 and 5 are respectively positioned at the centers in the spaces surrounded by the second shaft cover portions 6b and 6b so as to cover the swivel arm 7 fitted to the two small-diameter portions 2a from below. Are fitted into the small-diameter portion 2a of the drive shaft 2 through the fitting holes 4b of the substrate 4a, and are fixed to the drive shaft 2 by the spring washer 13, the washer 14, and the fixing screw 12, so that the drive source case 10 An anti-winding cover 1 is attached to the tip. In a state where the attachment is completed, the upper end surfaces of the first shaft cover portions 6a and 6a and the second shaft cover portions 6b and 6b of the lower cover member 4 are in contact with the lower surfaces of the outer peripheral portions of the upper and lower cover members 3 and 4, respectively. Alternatively, a slight gap is formed between the upper end surface and the lower surface of the upper cover member 3 so that the mowing grass does not enter.

  In the mower 100 as described above, when the drive source is driven by the operation switch 23 provided on the rear handle 22 of the operation rod 20, the drive shaft 2 rotates, thereby preventing the swivel arm 7 and the wrapping prevention. The lower cover member 4 of the cover 1 rotates. Along with this, the centrifugal blades 5 and 5 are respectively rotated around the pivotal screws 15 and 15 by centrifugal force and protruded in the extending direction of the swivel arm 7. As a result, the two centrifugal blades 5 and 5 are swung in a state of protruding from the outer peripheral surface of the lower cover member 4 of the anti-winding cover 1, and the protruding blades 5 and 5 cause grass such as weeds and turf. Is mowed. The drive shaft 2 is covered with the first shaft cover portion 6a and the second shaft cover portion 6b of the wrapping prevention cover 1, and the swivel arm 7 is surrounded by the second shaft cover portion 6b. There is no possibility that the cut grass will wind around the drive shaft 2 or the swivel arm 7 during the mowing operation.

  In the embodiment described above, the lower cover member 4 of the wrapping prevention cover 1 is formed by integrating the first shaft cover portion 6a, the second shaft cover portion 6b, and the substrate 4a. Only the two elements 6a and the second shaft cover 6b are integrated and separated from the substrate 4a, and the substrate 4a is in a free rotating state with respect to the drive shaft 2, so that the swivel arm 7 and the first shaft are rotated when the drive shaft 2 rotates. You may comprise so that only the cover part 6a and the 2nd shaft cover part 6b may rotate together (embodiment corresponding to Claim 2). In this case, since only the most fragile board 4a in the anti-winding cover 1 can be replaced with a new one, the replacement cost of parts can be suppressed. Here, the substrate 4a corresponds to the lower cover member 4 referred to in claim 2, and the first shaft cover portion 6a and the second shaft cover portion 6b correspond to the shaft cover member referred to in claim 2.

  In the above embodiment, the present invention is applied to a portable mower. However, the present invention is not limited to this. For example, the present invention is applied to a large mower such as a hand-held or self-propelled lawn mower. Can also be applied.

DESCRIPTION OF SYMBOLS 1 Winding prevention cover 2 Drive shaft 3 Upper cover member 4 Lower cover member 5 Centrifugal blade 6a 1st shaft cover part 6b 2nd shaft cover part 7 Turning arm 100 Mowing machine

Claims (2)

A driving source;
A drive shaft rotated by the drive source;
A swivel arm attached to the drive shaft;
A mowing machine comprising: a plurality of centrifugal blades having one end pivotally attached to the swivel arm and pivoted by a centrifugal force generated by the rotation of the swivel arm and projecting in an extending direction of the swivel arm In
A winding composed of an upper cover member that covers the upper part of the swivel area of the swivel arm, and a lower cover member that is fixed to the drive shaft so as to cover the lower part of the swivel area of the swivel arm and rotates together with the swivel arm. Has a protective cover,
The lower cover member of the wrapping prevention cover is
A plurality of first shaft cover portions provided so as not to interfere with the centrifugal blade between the outer peripheral portion of the lower cover member and the outer peripheral portion of the upper cover member, and partially covering the periphery of the drive shaft;
Between the edges of the first shaft cover portions adjacent to each other, the centrifugal blade is provided behind the centrifugal blade so as not to interfere with the centrifugal blade, and is covered with the first shaft cover portion around the drive shaft. A mowing machine comprising a plurality of second shaft cover portions covering a portion that is not present. A driving source;
A drive shaft rotated by the drive source;
A swivel arm attached to the drive shaft;
A mowing machine comprising: a plurality of centrifugal blades having one end pivotally attached to the swivel arm and pivoted by a centrifugal force generated by the rotation of the swivel arm and projecting in an extending direction of the swivel arm In
An upper cover member that covers an upper part of the swivel region of the swivel arm; a lower cover member that is rotatably attached to the drive shaft so as to cover a lower part of the swivel region of the swivel arm; An anti-winding cover composed of a shaft cover member that rotates together with the drive shaft in a state in which the space between the cover member and the lower cover member is closed;
The shaft cover member of the winding prevention cover is
A plurality of first shaft cover portions that are arranged at locations that do not interfere with the centrifugal blade between the outer peripheral portion of the lower cover member and the outer peripheral portion of the upper cover member, and partially cover the periphery of the drive shaft;
Between the edges of the first shaft cover portions adjacent to each other, the centrifugal blade is provided behind the centrifugal blade so as not to interfere with the centrifugal blade, and is covered with the first shaft cover portion around the drive shaft. A mowing machine comprising a plurality of second shaft cover portions covering a portion that is not present.

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