JP5429722B2 - Small management machine and resistance bar device used therefor - Google Patents

Description

  The present invention relates to a small management machine and a resistance bar device used therefor.

  Conventionally, as shown in FIG. 10, the small-sized management that transmits the drive of the drive source 101 to the rotating shaft 103 through the power transmission mechanism 102 and self-propels while plowing by the rotation of the tilling claw 104 attached to the rotating shaft 103. A machine 105 is known (Patent Document 1). The small management machine 105 includes a main body 106 including a drive source 101, a power transmission mechanism 102, and a rotating shaft 103. An operation handle 107 is provided at the upper rear part of the main body 106, and a resistance bar 108 extending toward the soil 109 is provided at the lower rear part. The resistance rod 108 is pierced into the soil 109 when moving forward, and the running resistance is given when moving forward by adjusting the amount of piercing and pressing of the soil 109, and the tilling depth and the traveling speed are adjusted by this traveling resistance. Yes.

Japanese Utility Model Publication No. 57-86502

  In the tilling work using the small management machine 105, there is a difficulty in controlling the tilling depth and the traveling speed by inserting and subtracting the resistance rod 108 into the soil, and it is necessary to get used to and get tips. In particular, when cultivating soil 109 such as hard soil, gravel, soil mixed with vegetation, clay, etc., it is difficult to cultivate the nail 104 into the soil. It is necessary to push down the handle 107 strongly to stop the advancement or to reduce the speed. However, in this case, there is a drawback that due to the principle of the lever, the force that lifts the tilling claw 104 upward acts with the lower end 108A of the resistance bar 108 as a fulcrum, which weakens the ability. In addition, when the lower end 108A of the resistance rod 108 becomes shallower due to hard soil or the like, the tilling claws 104 may travel on the surface layer, and thus sudden dashing may occur. When digging remains due to this dashing, it is necessary to plow again. However, in the small management machine 105 that does not have a retreat function, the operation is changed and the operation is returned, which requires a great deal of labor. For this reason, it was common to move forward as it was.

  An object of the present invention is to provide a small management machine and a resistance bar device used therefor that can easily and powerfully perform tillage work at a certain depth without unevenness even when soils having different hardness and properties are distributed. And

The resistance bar device for a small management machine of the present invention is a small-sized device that rotates a tilling claw attached to a tilling shaft by a driving force of a power source, operates a traveling direction of the tilling nail with an operation handle, and plows the soil with the tilling nail. A resistance bar device for a management machine, which is a resistance bar, a mounting bracket attached to a small management machine, and an operating handle that is attached to the mounting bracket, holds the resistance bar in a swingable manner, and when the tillage claw rotates. Allow the resistance rod to swing between the resistance application position that provides resistance during travel by the resistance rod pierced into the soil due to the descent of the ground and the retreat limit position where the tillage claw becomes the retraction limit due to the backward inclination of the resistance rod And a resistance rod swinging holding portion that supports the resistance rod in a posture in which the lower end of the resistance rod is positioned forward of the upper end at the resistance applying position .

The resistance bar device for a small management machine of the present invention is a small-sized device that rotates a tilling claw attached to a tilling shaft by a driving force of a power source, operates a traveling direction of the tilling nail with an operation handle, and plows the soil with the tilling nail. A resistance bar device for a management machine, comprising a resistance bar, a fixed bar attached to a small management machine, and an upper link member and a lower link member rotatably attached between the fixed bar and the resistance bar, When the pawl rotates, the resistance rod that pierces the soil with the lowering of the operation handle when the pawl rotates, and between the resistance application position that causes resistance during traveling and the retreat limit position where the tillage pawl becomes the receding limit due to backward tilting of the resistance rod And a resistance bar rocking / holding part that allows the resistance bar to rock, and the resistance bar rocking / holding part includes a spring that biases the resistance bar at a resistance applying position.

Incidentally, the swing angle between the resistance application position and a retracted limit position is preferably not less than 15 degrees and 30 degrees.

The small management machine of the present invention rotates a tillage claw attached to a tillage shaft by a power source and a power transmission mechanism, and an operation handle fixed to the power source or a support attached to the power transmission mechanism, A small management machine that operates the traveling direction and cultivates the soil with the tilling claws, and the operation handle swings the handle body relative to the handle body , the handle mounting portion fixed to the column, and the handle mounting portion. A hinge portion that is movably connected, a biasing member that biases the handle main body and the handle mounting portion in a direction to be integrated, and a resistance rod fixed to the handle main body near the hinge portion , resistance rod by lowering the operating handle pierces the soil, characterized in that it allows retraction of the tilling claws resistance bar is inclined rearward ground portion as a fulcrum to soil the resistance bar

  A small management machine according to the present invention includes the above-described resistance bar device for a small management machine. In addition, the resistance bar device may be provided as a separate component from the small management machine and retrofitted in addition to the one attached to the small management machine at the time of shipment.

  According to the present invention, the tilling claw can be moved backward by the swinging amount of the resistance bar device in a state where the tilling claw is rotated only by pressing the handle downward. Therefore, by retreating the tilling nail and subsequent advancement, re-tilling becomes possible, and even when hard soil, gravel, soil mixed with vegetation, clay, etc. are cultivated, the tilling depth can be made almost constant or deeper. it can. In addition, it is possible to automatically retract the tilling claw while rotating it by simply pressing the handle downward. At this time, the up-cut state is achieved, so that the tilling work can be performed easily and uniformly. .

It is a side view which shows the tilling state of 1st Embodiment of the small management machine of this invention. It is a disassembled perspective view of a resistance rod apparatus similarly. It is a side view which shows a small management machine when pushing down an operation handle and it will be in a retreat limit position. It is a side view which shows the tilling state of 2nd Embodiment of a small management machine. It is a disassembled perspective view of a resistance rod apparatus similarly. It is a side view which shows a small management machine when pushing down an operation handle similarly and it will be in the retreat limit position. It is a side view which shows the tilling state of 3rd Embodiment of a small management machine. It is a disassembled perspective view of a resistance rod apparatus similarly. It is a side view which shows a small management machine when pushing down an operation handle similarly and it will be in the retreat limit position. It is a side view which shows the outline of the small management machine demonstrated by the prior art.

[First Embodiment]
As shown in FIG. 1, the small management machine 10 includes a main body 11, an operation handle 12, and a resistance bar device 13 of the present invention. The main body 11 includes a power source 14, a power transmission mechanism 15, and a tilling shaft 16. The tillage shaft 16 rotates when the driving force of the power source 14 is transmitted through the power transmission mechanism 15. A tilling claw 17 is attached to the tilling shaft 16. Various types of tilling claws 17 can be selected and attached, and the number of attachments to the tilling shaft 16 may be appropriately increased or decreased. The small management machine 10 advances while tilling as the tillage claw 17 rotates counterclockwise.

  A support column 18 is provided at the rear of the main body 11. The lower end 12 </ b> A of the operation handle 12 is fixed to the column 18 with, for example, an attachment screw 19. The upper portion of the operation handle 12 is divided into two forks, and grips 22 are attached to both ends of the forks. A clutch lever 24 is attached to one grip 22. A wire 25 is connected to the clutch lever 24, and the wire 25 is connected to the power transmission mechanism 15. The clutch is engaged by grasping the clutch lever 24 and pulling the wire 25, and the drive of the power source 14 is transmitted to the tilling shaft 16 and rotates. By operating the clutch lever 24, the small manager 10 moves forward or stops.

  Although not shown, a throttle lever is attached to the other grip 22. The throttle lever is connected to the power source 14 through a wire. The rotation of the power source 14 is controlled by operating the throttle lever. When the power transmission mechanism 15 has a centrifugal clutch, the clutch lever 24 is omitted, and the small management machine 10 can be advanced or stopped by operating only the throttle lever. The operation handle 12 is not limited to the Y shape, and may be a U shape or other shapes.

  The resistance bar device 13 of the present invention is attached to the lower end 12 </ b> A of the operation handle 12. The resistance bar device 13 has a swing holding portion 36 and is attached to a hitch 30B as an attachment hole portion via an attachment shaft 38 as shown in FIG. As shown in FIG. 1, the front end of the mounting bracket 30 is fixed to the lower end 12A of the operation handle 12. As shown in FIG. 2, the mounting bracket 30 has a cylindrical hitch 30B in the vertical direction at the rear end.

  An insertion hole 30E for the mounting pin 33 is formed in the horizontal direction in the middle portion of the hitch 30B in the vertical direction. An insertion hole 38B for the attachment pin 33 is formed in the attachment shaft 38 at a position corresponding to the insertion hole 30E. After the attachment pin 33 is inserted into the insertion holes 30E and 38B, the drop prevention pin 47 is stopped, whereby the attachment shaft 38 is fixed to the hitch 30B. Although not shown, the mounting shaft 38 may be formed with a plurality of insertion holes 38B separated in the axial direction. In this case, by selecting the insertion hole 38B into which the mounting pin 33 is inserted. The mounting height of the swing holding part 36 can be changed by the distance of the plurality of insertion holes 38B.

  The resistance bar 39 is bent in a square shape. An insertion hole 39A for the attachment pin 45 is formed at the upper end. By inserting the attachment pin 45 through the attachment hole 37B of the holding plate 37 and the insertion hole 39A of the resistance rod 39, the resistance rod 39 is swingably attached to the holding plate 37 by the attachment pin 45. A drop prevention pin 47 is inserted into the mounting pin 45 and the swing restricting pin 46 so that the pins 45 and 46 are not dropped from the holding plate 37.

  A plurality of resistance rods 39 having different lengths are prepared as necessary, and an optimum one is selectively used according to the model of the small management machine 10 and the diameter of the tilling claw 17. For this reason, in order to facilitate replacement, an attachment structure with pins that can be easily attached and detached is employed. In addition, it may replace with the attachment by the pin 45 and the attachment by a bolt nut etc. may be sufficient.

  The resistance bar 39 swings between the lower end of the mounting shaft 38 and the swing restriction pin 46. As shown in FIG. 1, when the resistance bar 39 hits the swing restricting pin 46, it cannot swing further. This position becomes a resistance applying position by the resistance rod 39 at the time of forward movement. Further, as shown in FIG. 3, when the resistance bar 39 hits the lower end of the mounting shaft 38, it cannot swing any further. This position is the retreat limit position where the tilling claw 17 becomes the retreat limit.

  Next, the operation of the first embodiment will be described. As shown in FIG. 1, at the time of tillage work, the operation handle 12 is pushed downward, and the resistance bar 39 pierces the soil 50. When the small management machine 10 is advanced in this state, the resistance bar 39 has an appropriate resistance at the time of advance, and the soil 50 can be cultivated at an appropriate depth by the tilling claws 17. When the tilling claw 17 plows only the surface layer with hard soil, gravel, soil mixed with vegetation, clay, or the like, the operation handle 12 is pushed further downward. By changing the action direction of the pushing force by this pushing operation, the lower end 39B of the resistance bar 39 is displaced forward in the running direction from the resistance applying position, and the tilling claw 17 is moved to the retreat limit position as shown in FIG. Become. Due to the backward tilting displacement of the resistance rod 39 toward the retreat limit position, the tilling claw 17 is moved forward but is retracted. After the backward movement, the operation handle 12 is returned slightly upward to reduce the resistance of the resistance bar 39, and the forward movement is started again. In this way, by only depressing the operation handle 12, it is possible to appropriately enter the backward movement without rotating the tilling claw 17 in the reverse direction. At this time, the tilling claw 17 is in an upcut state, and a strong tillage is obtained. In this way, by appropriately repeating the backward movement and the forward movement, it is possible to plow at a desired depth, and it is possible to correct tillage unevenness.

Next, the principle of entering the backward movement will be described. In FIG. 1, when the force when the operation handle 12 is pushed down with the grip 22 is F1, the downward force F2 acting on the insertion hole 39A which is the swing fulcrum of the resistance rod 39 From the relationship of the moment of force at the center,
F2 = (D1 / D2) × F1.
D1 is the distance from the tilling shaft 16 to the grip 22, and D2 is the distance from the tilling shaft 16 to the insertion hole 39A as a swing fulcrum.

The backward component force F3 due to F2 in the insertion hole 39A is the angle of depression between the vertical line VL lowered from the insertion hole 39A as a swing fulcrum and the line L1 connecting the lower end 39B of the resistance rod 39 and the insertion hole 39A with θ1. When
F3 = F2 × tan θ1. When the backward component force F3 becomes larger than the forward force F0 due to the rotation of the tilling claws 17, the backward force F3 can be automatically retracted. In order to satisfy F3> F0, it is obtained by increasing the downward pressing force F1 of the operation handle 12. In the first embodiment, the component force F3 is a difference obtained by subtracting the horizontal distance D0 between the lower end of the resistance bar and the tilling shaft 16 from the horizontal distance D2 between the insertion hole 39A as the swing fulcrum and the tilling shaft 16. When D3 is small, the component force F3 is small, but there is an advantage that the configuration is simple.

  In the first embodiment, the resistance bar 39 is bent in a square shape, and the lower end portion of the resistance bar 39 is arranged obliquely rearward. It is possible to return these plants to the ground without crawling up.

  In the first embodiment, the resistance bar 39 is swingably held by the mounting bracket 30 and the swing holding portion 36. However, the swinging method of the resistance bar 39 and the operation handle 12 of the resistance bar 39 are not limited. The mounting method to the power transmission mechanism 15 is not limited to the illustrated example, and may be swingable by various methods. Further, the resistance bar 39 only needs to function as a resistance member, and is not limited to a bar, but may be a plate-like shape. Further, the lower end portion of the resistance bar 39 may be bent into an L shape.

[Second Embodiment]
As shown in FIGS. 4-6, in 2nd Embodiment, the rocking | fluctuation holding | maintenance part 51 has the fixed rod 52, the resistance rod 53, the upper link member 54 which connects these, and the 4 link linkage mechanism which has the lower link member 55 56. In the following embodiments, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 5, the fixing bar 52 is attached to the attachment bracket 57 by the attachment pins 45 and the drop-off prevention pins 47. Attaching holes 52 </ b> A are formed in the upper end portion and the lower end portion of the fixing rod 52. Similarly, two attachment holes 53 </ b> A are formed in the upper end portion of the resistance bar 53. The upper link member 54 and the lower link member 55 are swingably attached to the attachment holes 52A and 53A via the attachment pins 45 and the drop prevention pins 47.

  The upper link member 54 has a pair of upper link plates 60, locking pins 61, and spring mounting pins 62. The pair of upper link plates 60 have attachment holes 60A at both ends, and attachment holes 60B for the locking pins 61 and attachment holes 60C for the spring attachment pins 62 at the middle. Similarly to the upper link member 54, the lower link member 55 has a pair of lower link plates 65, locking pins 61, and spring mounting pins 62. The pair of lower link plates 65 have attachment holes 65A at both ends, and attachment holes 65B of the locking pins 61 and attachment holes 65C of the spring attachment pins 62 at the intermediate part.

  A coil spring 68 is attached between the spring attachment pins 62 of the upper and lower link members 54 and 55. The coil spring 68 urges both the spring mounting pins 62 to approach each other. The coil spring 68 biases the resistance bar 53 toward the resistance application position shown in FIG.

  In the small management machine 69 of the second embodiment, as shown in FIG. 6, the horizontal distance between the two attachment holes 60A of the upper link member 54 is increased by the downward pressing of the operation handle 12, and the lower link Since the horizontal distance between the two mounting holes 65A of the member 55 is small, the resistance bar 53 can be displaced from the resistance applying position to the retreat limit position and can enter the tillage by the retreat movement. In addition, after reaching the retreat limit position by the retreating movement, the resistance bar 53 is displaced from the retreat limit position to the resistance applying position by returning the operation handle 12 upward, and can be returned to the tilling by the retreating movement again. .

  In the second embodiment, the resistance bar 53 is swingably attached by the four-bar linkage mechanism 56, but the configuration is slightly complicated as compared with that of the first embodiment, but the swing angle of the resistance bar 53 is changed. The length can be made larger than that of the first embodiment, and the retractable length of the tilling claw 17 can be made longer by that amount, and an efficient tilling work can be performed.

  Note that the link mechanism is not limited to four nodes, and may be any structure that can hold the resistance rod 53 in a swingable manner.

[Third Embodiment]
As shown in FIGS. 7 to 9, the small management machine 70 of the third embodiment is a type in which the operation handle 71 is bent halfway. As shown in FIG. 7, the operation handle 71 includes a handle main body 71A, a handle mounting portion 71B, a hinge portion 72, and a coil spring 73 as an urging member. The handle attachment portion 71 </ b> B fixes the operation handle 71 to the column 18.

The hinge portion 72 connects the handle main body 71A and the handle mounting portion 71B so as to freely swing, and constitutes a resistance rod swing holding portion 74. As shown in FIG. 8, the hinge portion 72 has a pair of lower hinge 75, upper hinge 76, mounting bolt 77, and nut 78. The pair of lower hinges 75 are attached so as to extend downward from the upper end portion of the handle attachment portion 71B. A mounting hole 75 </ b> A is formed in the lower portion of the lower hinge 75. The upper hinge 76 is attached so as to extend downward from the lower end portion of the handle main body 71A. An attachment hole 76A is formed in the upper hinge 76. A mounting bolt 77 is inserted into each mounting hole 75A, 76A, and the upper hinge 76 is swingably mounted to the lower hinge 75. A nut 78 is attached to one end of the mounting bolt 77 to prevent the mounting bolt 77 from falling off the mounting hole 76A.

  A resistance rod fixing tube 80 is fixed behind the upper hinge 76 so as to penetrate the lower part of the handle main body 71A up and down. A resistance rod fixing hole 80A is formed in the lower portion of the resistance rod fixing tube 80. A resistance rod 81 is inserted into the resistance rod fixing tube 80 and is fixed by a mounting pin 82 and a drop prevention pin 83. For this reason, an attachment hole 81A is formed in the upper portion of the resistance bar 81 at a position corresponding to the resistance bar fixing hole 80A. It is preferable that a plurality of resistance rod fixing holes 80 </ b> A and attachment holes 81 </ b> A are formed in the axial direction of the resistance rod 81. In this case, by appropriately selecting the fixing hole 80A and the mounting hole 81A and inserting the mounting pin 82, the mounting length of the resistance bar 81 can be set according to the type of the small management machine 70, the properties of the soil, and the like. Can be changed.

  Also in the third embodiment, when it is likely that the surface layer will be plowed when the soil is hard or the like, the operation handle 71 is pushed down to return the tilling claw 17 backward with the lower end of the resistance bar 81 as a fulcrum. . At this time, as in the first and second embodiments, the tillage claw 17 does not lift up with the lower end of the resistance bar as a fulcrum, and the retracting lever 17 does not lift up, as compared with the case where the operation handle 12 is integrated. Retraction by the tilling claws 17 is reliably performed, and powerful tilling is possible while correcting the unevenness of tilling. In the first and second embodiments as well, the disadvantage that the tilling claw 17 is lifted for the rearward component force conversion by swinging the resistance rod is smaller than the conventional small management machine having the resistance rod fixed to the main body. It has been improved.

  The resistance bar device 85 according to the third embodiment has a drawback that it is increased in size including the operation handle 71 as a retrofit device. In addition to providing as a retrofit device, a resistance bar device may be provided on the handle as a new management machine.

  Also in the third embodiment, the power source 14 is driven and the resistance rod 81 is inserted into the soil, and the tilling claws 17 are rotated forward to advance while tilling, and the soil is plowed by the rotation of the tilling claws. When reaching a hard part, only the surface layer may be plowed.

  At this time, the operation handle 71 is pushed down. As shown in FIG. 9, the push-down operation causes the handle main body 71A to be bent downwardly around the mounting bolt 77 against the bias of the coil spring 73, and the resistance bar 81 has a lower end 81B. Tilt backwards around the center. By this rearward inclination, the tilling claw 17 can move backward while rotating and can be cultivated in an upcut state. Moreover, in this embodiment, unlike the other embodiments, even if the operation handle is pushed down, the tilling claw 17 does not lift up, the upcut state is maintained, and the tilling force does not weaken.

DESCRIPTION OF SYMBOLS 10 Small management machine 11 Main-body part 12 Operation handle 13 Resistance rod apparatus 14 Power source 15 Power transmission mechanism 16 Tilling shaft 17 Tilling claw 18 Post 30 Mounting bracket 36 Oscillation holding part 39 Resistance bar 50 Ground 51 Oscillation holding part 53 Resistance Rod 54 Upper link member 55 Lower link member 56 Four-bar linkage mechanism 57 Mounting bracket 68 Coil springs 69, 70 Small controller 71A Handle body 71B Handle mounting portion 71 Operation handle 72 Hinge portion 73 Coil spring 80 Resistance rod fixed tube 81 Resistance rod 85 Resistance Bar equipment

Claims (4)

In the resistance bar device for a small management machine that rotates the tillage claw attached to the tillage shaft by the driving force of the power source, operates the traveling direction of the tillage nail with the operation handle, and plows the soil with the tillage nail,
A resistance rod,
A mounting bracket attached to the small management machine;
A resistance applying position that is attached to the mounting bracket, holds the resistance rod in a swingable manner, and provides resistance during running by the resistance rod pierced into the soil by lowering the operation handle when the tilling claw rotates. And a resistance bar swing holding part that allows the resistance bar to swing between a reverse limit position where the tillage claw becomes a reverse limit due to a backward tilt of the resistance bar;
With
A resistance bar device for a small management machine , wherein the resistance bar is supported in a posture in which the lower end of the resistance bar is positioned forward of the upper end when the resistance is applied. In the resistance bar device for a small management machine that rotates the tillage claw attached to the tillage shaft by the driving force of the power source, operates the traveling direction of the tillage nail with the operation handle, and plows the soil with the tillage nail,
  A resistance rod,
  A fixing rod attached to the small management machine;
  An upper link member and a lower link member that are rotatably mounted between the fixed rod and the resistance rod, and the resistance rod pierced into the soil by the lowering of the operation handle when the tilling claw rotates A resistance bar swing holding portion that allows the resistance bar to swing between a resistance applying position that becomes resistance during traveling and a retreat limit position where the tilling claw becomes a retreat limit by backward tilting of the resistance bar;
With
  The resistance bar swing holding part includes a spring for biasing the resistance bar at the resistance applying position, and a resistance bar device for a small management machine. A small management machine comprising the resistance bar device for a small management machine according to claim 1 or 2 . The tillage claw attached to the tillage shaft is rotated by a power source and a power transmission mechanism, and the operation handle fixed to the power source or the support attached to the power transmission mechanism is used to operate the advancing direction of the tillage claw. In a small management machine that cultivates the soil with nails,
The operation handle is
The handle body,
A handle mounting portion fixed to the column;
A hinge portion that pivotably connects the handle body to the handle mounting portion ;
A biasing member that biases the handle main body and the handle mounting portion in a direction to be integrated; and a resistance rod fixed to the handle main body near the hinge portion ;
The hinge part is configured such that the resistance bar sticks into the soil when the operating handle is lowered, and the resistance bar tilts backward with the grounding portion of the resistance bar to the soil as a fulcrum so that the tilling claw can be retracted. A small management machine.

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