JP2009291087A - Bush cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bush cutter not only causing no trouble of twining on the bush cutter even when the bush cutting of grass and ivy is carried out, but also can carry out the bush cutting so that the cut grass and ivy may be swept out to a prescribed side direction without being dispersed to all sides. <P>SOLUTION: The bush cutter is constituted as follows. A controlling plate 5 having crossing angles to a rod 2 and a circular saw 4 is stood, and the edge at the upper surface of the controlling plate 5 is slightly separated from the upper surface of the circular saw 4 and protruded from the position of a saw blade 15 of the circular saw 4. An orbiting driven gear 12 rotated by receiving a rotary driving force is attached to a rotary shaft, and a damper 6 for interfering and controlling the force in a direction perpendicular to the controlling plate 5 is installed. An orbiting following gear 9 is suitable for the chip from the damper 6, and a following shaft 8 is hung onto the upper surface of the circular saw 4 in a contact state. An orbiting chain 10 having cut teeth 11 formed on the periphery is hung between the orbiting driven gear 12 and the orbiting following gear 9. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a brush cutter that is preferably used for the weeding operation of weeds generated on the shores of ridges.

Conventionally, a saw blade used in a brush cutter is well known to have a substantially disk shape, and a shaft hole for inserting and fixing a rotary shaft is provided at the center portion. Install it on the rotating shaft. In addition, the mounting structure has a rotating shaft protruding at a predetermined angle at the tip of the housing through which the rotation transmission shaft passes, and the saw blade has a flange-like shape in which the rotating shaft is spline-fitted to the tip. It is attached between the upper split boss and the lower split boss.
Furthermore, the brush cutter can be used by moving the saw blade back and forth from side to side while keeping the distance from the ground constant, with the saw blade rotating slightly away from the ground where weeds are overgrown. Work.

  By the way, when weeds are removed with the above conventional brush cutter, if weeds are mixed, the weeds wind around the rotating shafts such as the bush cutter housing and the upper split boss, and the resistance There was a problem that the circular saw stopped rotating. When the circular saw stops like this, the circular saw suddenly restarts when the operator manually removes the wrapped vine without manually stopping the engine. There was an accident that was injured.

On the other hand, in recent years, various proposals have been made on a brush cutter for preventing the vines and the like from being wound around the rotating shaft in the conventional brush cutter.
For example, Japanese Utility Model Laid-Open No. 6-5412 has a brush cutter for the purpose of preventing wrapping of grass at the time of brush cutting, and its configuration is a housing fixedly provided at the lower end of the handle. In a brush cutter in which the upper circular saw clamping member and the lower circular saw clamping member are fixed to the rotating shaft protruding from the lower surface of the blade, and the peripheral edge of the mounting hole of the circular saw is clamped between the upper and lower clamping members The gist is that a circular saw and a wrapping preventing member having teeth positioned around the housing are clamped between the circular saw clamping members. Further, in the first case where the anti-winding member at this time is clamped between the upper circular saw clamping member and the circular saw, a horizontal plate-like connecting portion in which a mounting hole is formed, and this connecting portion In the second case in which teeth are formed on the claw-shaped portion, the plate is further formed with a mounting hole to prevent this wrapping. A claw-shaped part is provided on the member so as to protrude upward, and the anti-winding member is clamped between the lower circular saw clamping member and the circular saw with the claw-shaped part passing through a through hole formed in the circular saw. A third case is disclosed in which teeth are formed on the nail-shaped portion, or further, the nail-shaped portion is provided with an overhanging portion projecting outward, and the teeth are formed on the overhanging portion. Yes. When the brush cutter configured as described above is used for cutting weeds or the like, when the rotary shaft is rotated and the circular saw is rotated, the brush cutter is clamped between the upper and lower clamping members fixed to the rotary shaft. The wound anti-winding member also rotates together with the circular saw, so that even if vines or the like are wrapped around the rotating shaft, they are cut by the teeth of the anti-winding member and the winding is ensured. It was to be prevented.

Furthermore, the anti-winding member, the cutting blade, and the brush cutter provided with them described in JP-A No. 2005-118003 further prevent grass and vines from being wound around the rotating shaft, the rotating member, and the mounting member without increasing the manufacturing cost. An object of the present invention is to provide an anti-winding member, a circular saw, and a brush cutter provided with the same, the structure of which includes a circular saw, an upper circular saw clamping member, and a lower circular saw clamping member on a rotating shaft. Is sandwiched from below, and a winding prevention member is sandwiched between the circular saw and the upper circular saw clamping member, and the winding prevention blade and the standing blade are wound around the winding prevention member. It is formed to project outward from the substrate portion of the prevention member, and is arranged alternately on the outer peripheral edge of the substrate portion. Further, the anti-winding blade is formed by bending the base end portion of the trapezoidal projection piece formed on the outer peripheral edge of the substrate portion obliquely upward and bending the intermediate portion of the protrusion piece obliquely downward. ing. At this time, the gist of the invention is that the tip of the anti-winding blade is provided so as to contact the upper surface of the circular saw. Subsequently, according to the brush cutter having the above-described configuration, grass and vines to be wound around the anti-winding member are cut by the anti-winding blade and are not cut by the anti-winding blade. The vine and the vine were cut by a standing blade that immediately turned.
Japanese Utility Model Publication No. 6-5412 JP 2005-118003 A

  In the brush cutter according to Japanese Utility Model Laid-Open No. 6-5412 described in the background section above, when the anti-winding member is clamped between the circular saw and the upper circular saw clamping member, particularly thin vines are removed by the brush cutter. When cutting, there is a problem that the vines get into a slight gap where the circular saw and the wrapping preventing member are in contact with each other and get entangled. In such a case, the other end opposite to one end of the entwined vine is further wound around the handle, housing, etc. of the brush cutter, and the resistance stops the rotation of the circular saw. There were drawbacks.

  In addition, in the anti-winding member, the cutting blade, and the brush cutter provided with them disclosed in Japanese Patent Application Laid-Open No. 2005-118003, long grass, vines and the like remain on the upper surface of the anti-winding member. However, there is a problem that grass and vines that have been trimmed are scattered in all directions, and that more labor is required to accumulate the scattered grass in a suitable state after trimming. More specifically, when weeding weeds on the shoreline, if the side of the shoreline is a waterway, the grass cut by the mowing falls into the waterway, and these are accumulated downstream. Therefore, it is necessary to clean up after a predetermined amount of water. Alternatively, on the shoreline where the owners of adjacent paddy fields are different, the centerline of the shoreline is customarily classified as the management category of both. It is forbidden to disperse the grass that has been mowed into the division, so the mowed grass must be put on the self-management side. In this way, when an actual mowing operation site is assumed, it is necessary to say that scattering the grass, vines, etc. in four directions by the mower has a serious drawback.

  The object of the present invention has been made in view of the drawbacks of the prior art described in the background section above, and has been made based on the results of many years of experiments and research by the inventor of the present invention. When weeding weeds on the shore, etc., weeding grass and vines does not hinder tangling to the brush cutter, and cuts grass and vines on all sides. It is an object of the present invention to provide a brush cutter that can be brushed so as to sweep to a desired side without being scattered.

  In order to achieve the above object, the brush cutter according to the present invention has a housing fixed to the lower end portion of the housing, and a circular saw attached to the tip of the rotating shaft of the housing, while a handle is attached to the upper portion of the housing. And a control lever, and a brush cutter provided with an engine for rotationally driving the circular saw, from the lower end of the casing toward the upper side of the casing, While a deterrence plate having an intersecting angle is erected, the upper side edge of the circular saw in the deterrence plate is slightly spaced from the upper surface of the circular saw and extends beyond the position of the circular saw, On the upper surface side of the circular saw, a circular drive gear that rotates by receiving the rotational drive together with the circular saw is attached to the rotary shaft, and on the other hand, the interference plate controls the vertical upward force to the circular saw side in the suppression plate. Part of the A circular driven gear is fitted to the tip of the circular saw, the driven shaft is suspended in contact with the upper surface of the circular saw, and a plurality of claw portions protruding outwardly between the circular drive gear and the circular driven gear The first gist is that the installed belt is pivoted.

  Further, in the brush cutter according to the present invention, in the restraining plate, the interference portion that performs interference control of the force in the upward direction perpendicular to the circular saw side can be a shock absorber and the driven shaft can be a piston rod of the shock absorber.

  Furthermore, in the brush cutter according to the present invention, the orbiting belt can form a chain shape and the claw portion of the orbiting belt.

  The brush cutter according to the present invention is provided with an interference part that interference-controls the force in the vertical upward direction on the circular saw side in the restraining plate, and a circular driven gear is fitted to the tip from the interference part, and the driven shaft is the circular saw. Because it is suspended in contact with the upper surface, when trying to cut dense weeds at a time, the rotation of the circular saw is loaded, preventing the circular saw from rotating properly and preventing undulations There is an effect that can be.

  Further, the brush cutter according to the present invention is provided with a shock absorber for interference control of the force in the vertical upward direction on the circular saw side in the restraining plate, and further, a revolving driven gear is fitted to the rod tip of the shock absorber. At the same time, the rod tip is in contact with the upper surface of the circular saw, so when trying to cut densely weeds at once, a load is applied to the rotation of the circular saw, and the circular saw does not maintain the correct rotation trajectory and undulates. There is an effect that can be prevented.

  Furthermore, the brush cutter according to the present invention cuts hard grasses by rotating the circular saw with the above-described configuration, while removing the hard vines that are not completely cut and hang on the saw blade of the circular saw. In the meantime, the rotation of the claw portion of the orbiting belt or the orbiting chain pivoted between the orbiting drive gear and the orbiting driven gear prevents the hard vines from being hindered from being wound around the rotation axis of the circular saw in the brush cutter. Even in a working environment where moisture such as dew adheres to the weeds and is easily tangled, the cut weeds are forcibly transferred or transferred to the circular saw side and cut by the claw portion or the circulating chain of the circulating belt. be able to. Furthermore, since the grass and vines cut and transferred in this way are accumulated on the deterrence plate, it is possible to prevent the trouble of the vines and the like against the brush cutter being entangled, and the operator can remove the brush cutter. There is an effect that the weed accumulated on the deterrence plate can be mowed so as to be swept out to the required side while the weed generated on the shore is swung to the left and right while swinging the rod.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

First, FIG.6 and FIG.7 is the schematic diagram from the side surface which showed the lower end part of the conventional brush cutter, and the schematic diagram from the upper surface direction, respectively. As shown in the figure, the conventional brush cutter 50 has a housing 3 fixed to the lower end portion of the housing 2, and a rotation shaft supported on the housing 3. The lower end portion of the rotation shaft projecting downward from the housing 3. The upper split mold boss 14 and the lower split mold boss 13 are inserted, and a circular saw 4 is attached between the upper and lower split mold bosses. On the other hand, although not shown, a handle, an operation lever, and the like are provided on the upper portion of the housing 2, and an engine is provided on the upper end portion of the housing 2 or a shoulder portion carried by an operator, and the rotation shaft is driven by the engine. Driven by this, the circular saw 4 is rotated, and the weeds and the like are removed by the saw blade 15.

  In the conventional brush cutter 50 configured as described above, when cutting particularly thin vines, the vines enter the slight gap where the circular saw 4 and the upper split boss 14 are in contact with each other. Further, when the operation is continued, the other end opposite to one end of the entwined vines is wound around the housing 2 and the housing 3 of the brush cutter 50, and the resistance of the circular saw 4 stops due to the resistance. There was a drawback.

  Next, FIG. 1 is a schematic view from the side showing the lower end of the brush cutter according to the present invention. Here, as shown in the figure, a restraining plate 5 having an intersecting angle between the housing 2 and the circular saw 4 is erected from the lower end portion of the housing 2 of the brush cutter 1 according to the present invention to above the housing 2. ing. Further, the upper side edge of the circular saw 4 in the restraining plate 5 is slightly separated from the upper surface of the circular saw 4 and extends beyond the position of the saw blade 15 of the circular saw 4. On the other hand, a circular drive gear 12 that rotates in response to the rotational drive with the circular saw 4 is attached to the rotary shaft on the upper surface side of the circular saw 4. A damper portion 6 is provided, and a rotating driven gear 9 is fitted to the tip of the damper portion 6 so that the driven shaft 8 is suspended in contact with the upper surface of the circular saw 4. Between the driven gears 9, a revolving chain 10 having a plurality of cutting teeth 11 projecting outward from the revolving outer periphery is pivoted. In addition, the code | symbol 16 in a figure is the volt | bolt 16 which clamps the suppression board 5 to the housing 2 which is a long cylindrical shape.

  Next, FIG. 2 is an enlarged plan view and an enlarged front view of the orbiting drive gear incorporated in the brush cutter according to the present invention. Here, the orbiting drive gear 12 rotates in response to the circular saw 4 and rotates, and the orbiting drive gear 12 meshes with the orbiting chain 10 to rotate the orbiting chain 10.

  FIG. 3 is an enlarged view showing an outline of a damper portion incorporated in the present invention. Here, as shown in the figure, the damper portion 6 is provided in the role of performing interference control of the force in the vertical upward direction on the circular saw 4 side in the restraining plate 5, and a flange portion 28 is provided in the cylinder portion 29. The driven shaft 8 is sealed in a state of being pushed vertically downward by the biased spring 7, and the tip end portion of the driven shaft 8 is bulged by the protruding portion 30, so that the upper surface of the circular saw 4 is The circumferential driven gear 9 is fitted to the driven shaft 8 with a slight contact with the driven shaft 9. These damper portions 6 are fixed to the restraining plate 5 with rivets 17.

  Subsequently, FIG. 4 is an enlarged plan view and an enlarged front view of a circular chain used in the present invention. Here, in the revolving chain 10, the lower metal fitting 31 and the upper metal fitting 32 are combined and connected to each other by the support pins 33, and as shown in the figure, the upper metal fitting 32 protrudes outwardly from the revolving circle. 11 is formed.

FIG. 5 is a schematic view from the side showing the lower end of another brush cutter according to the present invention. Also here, as shown in the figure, a restraining plate 5 having an intersecting angle between the housing 2 and the circular saw 4 stands from the lower end of the housing 2 of the another brush cutter 20 according to the present invention to the upper side of the housing 2. It is installed. Further, the upper side edge of the circular saw 4 in the restraining plate 5 is slightly separated from the upper surface of the circular saw 4 and extends beyond the position of the saw blade 15 of the circular saw 4. On the other hand, a circular drive gear 22 that rotates on the upper surface side of the circular saw 4 together with the circular saw 4 is attached to the rotary shaft, and the interference plate controls the force in the vertical upward direction on the circular saw 4 side on the other suppression plate 5. A shock absorber 25 is provided, and the end of the rod 26 of the shock absorber 25 is fitted with a circumferential driven gear 21, and the end of the rod 26 is on the upper surface of the circular saw 4, similarly to the brush cutter according to the present invention. It is in a point-like contact state. Further, a circulating belt 23 around which a plurality of claw portions 24 projecting outward is provided between the rotating driving gear 22 and the rotating driven gear 21. The shock absorber 25 is fixed to the restraining plate 5 with a fixing bracket 27.

  Subsequently, in the brush cutter according to the present invention and another brush cutter according to the present invention, the tips of the driven shaft 8 and the rod 26 are projected so as to contact the upper surface of the circular saw 4 in a dotted manner. Is to prevent friction resistance between the two as much as possible.

  Here, as shown in FIG. 1 and FIG. 5, the brush cutters 1 and 20 according to the present invention are provided with the restraining plate 5, so that they are hung on the saw blade 15 of the circular saw 4 without being completely cut. The hard vines are prevented from winding around the rotating shaft of the circular saw 4 in the brush cutters 1 and 20 by the revolving operation of the claw portion 24 of the revolving belt 23 or the cutting teeth 11 of the revolving chain 10. On the other hand, even in a working environment in which moisture such as dew adheres to the weeds and is easily entangled, the cut weeds are forcibly forced by the claw portion 24 of the orbiting belt 23 or 11 of the orbiting chain 10 and the saw blade 15 of the circular saw 4. It can be transferred to the side or transferred and cut. Furthermore, since the grass and vines thus cut and transported are accumulated on the deterrent plate 5, the operator generates them on the shore while swinging the housing 2 of the brush cutters 1 and 20 left and right. During the weeding operation of the weeds, the weeds accumulated on the deterrent plate 5 can be trimmed so as to be swept out to the required side.

  The brush cutter according to the present invention has the characteristics as the brush cutter described in the best mode for carrying out the invention, and dramatically improves the efficiency of the brush cutting work which has been extremely hard work until now. In the working environment where moisture such as dew adheres to the weeds and can easily get entangled, the weeds after being cut are forcibly transferred in the direction of the circular saw by the operation of the circling belt and the circling chain. It is extremely useful because it can greatly prevent accidents caused by weeds and other entanglements and ensure work safety.

The schematic diagram from the side direction which showed the lower end part of the brush cutter which concerns on this invention. The enlarged plan view and enlarged front view of the rotation drive gear incorporated in the brush cutter which concerns on this invention. The enlarged view which showed the outline | summary of the damper part integrated in this invention. The expansion plan view and expansion front view of the circulation chain used for this invention. The schematic diagram from the side which showed the lower end part of another brush cutter concerning the present invention. The schematic diagram from the side direction which showed the lower end part of the conventional brush cutter. The schematic diagram from the upper surface direction which showed the lower end part of the conventional brush cutter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Brush cutter 2 Housing 3 Housing 4 Circular saw 5 Suppression plate 6 Damper part 7 Spring 8 Drive shaft 9 Circulation driven gear 10 Circulation chain 11 Cutting teeth 12, 22 Circulation drive gear 13 Lower split boss 14 Upper split mold Boss 15 Saw blade 16 Bolt 17 Rivet 20 Another brush cutter according to the present invention 21 Circulation driven gear 23 Circulation belt 24 Claw portion 25 Shock absorber 26 Rod 27 Fixing bracket 28 Hook 29 Cylinder portion 30 Protruding portion 31 Lower bracket 32 Upper bracket 33 Support pin 50 Conventional brush cutter

Claims (3)

  A housing is fixed to the lower end of the housing, and a circular saw is attached to the tip of the rotating shaft of the housing, while a handle and an operating lever are provided on the top of the housing, and the rotation of the circular saw In a brush cutter provided with an engine for driving, a restraining plate having an intersecting angle between the housing and the circular saw is erected from a lower end portion of the housing toward the upper side of the housing, The upper surface side edge of the saw is slightly separated from the upper surface of the circular saw and extends from the position of the circular saw, while the upper surface side of the circular saw receives the rotation drive together with the circular saw. A rotating orbiting drive gear is attached to the rotating shaft, and on the other hand, an interference portion for interference-controlling the force in the vertical upward direction is provided on the circular saw side on the deterrent plate, and the orbiting driven gear is fitted from the interference portion to the tip. The driven shaft is Further, the belt is suspended in contact with the upper surface, and a revolving belt having a plurality of claw portions protruding outwardly between the revolving drive gear and the revolving driven gear is mounted on the shaft. , Brush cutter.   2. The brush cutter according to claim 1, wherein in the restraining plate, the interference part for performing interference control of the force in the vertical upward direction on the circular saw side is a shock absorber, and the driven shaft is a piston rod of the shock absorber.   The brush cutter according to claim 1 or 2, wherein the circumferential belt has a chain shape, and the claw portion of the circumferential belt is an incisor.

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