JPH076746Y2 - Brush cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a brush cutter.

(Prior Art) An engine is mounted on a machine frame provided with a traveling device and a steering wheel, and a cutting blade driven by this engine is arranged in the lower front of the machine frame. Conventionally, a brush cutter that uses a cutting blade to mow weeds and the like while traveling by has been proposed in Japanese Utility Model Publication No. 48-15238.

(Problems to be solved by the invention) However, in the conventional brush cutter, the brush cutter is attached to the lower end of the rotating shaft extending downward from the engine side through the transmission device. However, weeds could not be cut, and the area around the field could not be cut.

In the conventional brush cutter, the brush cutter is removable so that it can be replaced, but the transmission case that supports it is fixed to the machine frame and cannot be removed. It was very difficult to transport.

In view of such a conventional problem, the present invention enables not only the cutting of the side of the traveling position but also the cutting of the sloped surface of the shore, and the transmission for supporting the cutting blade during transportation. The purpose is to remove the case and make it compact.

(Means for Solving the Problems) In order to achieve the above object, the present invention has taken the following means.
That is, the feature of the present invention is that the engine 21 is provided on the machine casing 1 having the traveling device 8 and the steering handle 6, and the cutting blade 54 driven by the engine 21 is provided at the lower front portion of the machine casing 1. In the brush cutter having the above-mentioned arrangement, a first transmission case 25 projecting downward from the engine 21 is provided in the vicinity of the front of the machine frame 1 so that the angle can be adjusted around the front-rear axis center on the upper side. A second transmission case 32, which protrudes forward from the first transmission case 25 and has the cutting blade 54 at the front end, is provided at the lower end of 25 so that the angle can be adjusted around the front-rear axis, and the second transmission case is provided. 32 is detachably attached to the first transmission case 25 by a rotating portion at the rear end,
A boss portion 43 is provided at a lower end portion of the first transmission case 25, and a rotation portion at a rear end of the second transmission case 32 is attachable to and detachable from the boss portion 43 and rotates about a front-rear axis. A freely rotatable case 40 is provided, a peripheral groove 45 is provided at a joint portion of the boss portion 43 and the rotatable case 40, and a lock pin 44 that can be engaged and disengaged is provided at the peripheral groove 45. 44 is the circumferential groove
By engaging with 45, the boss portion 43 and the rotating case 40 are prevented from moving in the axial direction, and are allowed to rotate around the front-rear axis center. An angle adjusting means 71 is provided between the transmission case 32 and the transmission case 32 so as to be detachably engaged with the transmission case 32 and regulate the relative rotation of the both.

(Operation) At the time of work, while driving the cutting blade 54 with the engine 21, the traveling device 8 causes the cutting blade 54 to travel, and the cutting blade 54 cuts weeds and the like. At this time, if the first transmission case 25 is rotated in the left-right direction, the cutting blade 54 is positioned on the side of the traveling position, and the side cutting work can be performed. In addition, by adjusting the angle of the second transmission case 32 with respect to the first transmission case 25, the cutting blade 54 can be along the ground, and the work of cutting a sloped surface or the like can be easily performed.

At the time of transportation, the second transmission case 32 is removed from the first transmission case 25 by the rotating portion at the rear end. As a result, the entire brush cutter can be divided into two parts, so that the brush cutter can be made compact and can be easily loaded on the trunk of a passenger car and transported.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

1 to 3 show a brush cutter provided with a reciprocating type cutting blade, 1 is a machine frame, a side surface provided with a horizontal portion 2 on the front side and a rearwardly inclined portion 3 on the rear side. A pair of left and right steering handles 6 are fixed to the rear end of the inclined portion 3 of the machine frame 1 via a chrysanthemum 4 and a bolt 5 so as to be detachable and adjustable in angle. The pair of steering handles 6 is connected to the left and right pair by a panel 7 on the way.

Reference numeral 8 denotes a traveling device arranged below the machine casing 1, which includes a pair of left and right wheels 11 supported on the left and right sides of the transmission case 9 via axles 10, and a rearwardly inclined slope of the transmission case 9. And a traveling motor 12 mounted as described above. Traveling motor 12
As shown in FIG. 4, a bevel gear 14 is fixed to the output shaft 13 of the inside of the transmission case 9.
Is engaged with a bevel gear 15 fitted on the axle 10. The bevel gear 15 is provided by a shifter clutch 16 so that it can be connected to and disconnected from the axle 10. Therefore, the traveling motor
The wheel 11 can be driven forward or backward by rotating the wheel 12 in the forward or reverse direction, and the drive can be stopped by disconnecting the shifter clutch 16. A mounting cylinder 17 is fixedly installed on the upper side of the transmission case 9, and as shown in FIG. 5, the mounting cylinder 17 is a fixed rod projecting downward from the center of the horizontal portion 2 of the machine frame 1. A pin 19 is inserted into and removed from the lower side of the mounting barrel 17 and is fixed to the mounting rod 17 and the fixed rod 18 by a pin 19 which is inserted from the lateral direction in a detachable manner. Therefore, the traveling device 8 is attachable to and detachable from the machine casing 1.

Reference numeral 21 denotes an engine arranged on the machine casing 1, which is mounted on the horizontal portion 2 of the machine casing 1 via a column 22. As shown in FIG. 4, a support case 24 having an electromagnetic clutch 23 connected to its crankshaft is fixedly installed at the front portion of the engine 21, and the first transmission case 25 has a boss portion on the support case 24. It is attached via 26 so as to be rotatable around the front-rear axis. The first transmission case 25 is vertically arranged so as to extend downward from the axle case 24 through the vicinity of the front of the machine casing 1. In the first transmission case 25, a transmission shaft 27 and a pulley 28 in the front-rear direction are provided at both upper and lower ends thereof, and the transmission shaft 27
A belt 30 is wound around a fixed pulley 29 and a pulley 28, and a transmission mechanism 31 is constituted by these. The transmission shaft 27 is concentric with the boss portion 26, and the electromagnetic clutch
It is connected to the crankshaft via 23.

Reference numeral 32 denotes a second transmission case, and as shown in FIG. 4, a vertical rotating shaft 34 having power take-out portions 33 at both upper and lower ends is supported, and a bevel gear fixed to the rotating shaft 34 and the transmitting shaft 35. 36 and 37 are incorporated inside, and these constitute a transmission mechanism 38. A support cylinder 39 having a flange 38 at the rear end is attached to the rear of the second transmission case 32,
The flange 38 of the support cylinder 39 is detachably attached to the flange 41 of the rotating case 40 with bolts 42. The rotating case 40 is detachably fitted to the boss portion 43 at the lower end of the first transmission case 25 from the front side, and is rotatably supported around the front-rear axis of the boss portion 43, and by the lock pin 44. It has been stopped. That is, the boss portion 43 has a circumferential groove 45 on the outer circumference.
The lock pin 44 is inserted into the rotating case 40 so as to engage with the peripheral groove 45 thereof in a disengageable manner. Lock pin 44
6 has a small diameter portion 48 between the operating head 46 and the engaging portion 47, as shown in FIG.
It is slidably inserted in and is biased by a spring 50 so that the engaging portion 47 engages with the circumferential groove 45. Therefore, the second transmission case
In the engaged state in which the engaging portion 47 of the lock pin 44 is engaged with the circumferential groove 45, the reference numeral 32 is non-removable in the first transmission case 25 and rotatable about the front-rear axis, and the head portion 46 is fixed. When the pushing small diameter portion 48 is made to correspond to the circumferential groove 45 against the spring 50, the rotating case 40 is disengaged from the boss portion 43 and can be detached from the first transmission case 25. The transmission shaft 35 is supported on the side of the second transmission case 32, and is inserted into and removed from the pulley 28 so as to come off from the pulley 28 when the second transmission case 32 is removed together with the rotating case 40.

Reference numeral 51 is a cutting blade support case, and a fixed blade 52 and a movable blade 53 slidable in the left and right directions relative to the fixed blade 52 are provided at the front end of the support case 51.
A reciprocating type cutting blade 54 composed of and is attached. The support case 51 is attached to the lower side of the second transmission case 32 with bolts. As shown in FIGS. 4 and 7, the movable blade 52 is reciprocally driven left and right by the rotation of the rotary shaft 34 via the swing arm 55 in the support case 51 and the eccentric pin 57 of the eccentric boss 56. . That is, the eccentric boss 56 is attached to the power take-out portion 32 of the rotary shaft 34. The swing arm 55 is swingably supported by a support shaft 59 in a support case 51 via a boss 58 at the center, and an eccentric pin 57 is provided in a long hole 60 at the rear end of the swing arm 55.
However, the pins 63 of the movable blade 52 are engaged with the engaging recesses 62 at the front end, respectively.

Reference numeral 64 is a first angle adjusting means for adjusting the angle of the first transmission case 25 around the boss portion 26. As shown in FIGS. 4 and 8, a support shaft 66 is provided on a bracket 65 at the front end of the machine frame 1. A pivotally attached adjustment lever 67 and a link fixed to the adjustment lever 67
Both ends of the 68, the link 68, and the first transmission case 25 are pins.
The adjusting lever 67 has a link 71a pivotally connected by 69 and 70, and a plurality of engaging portions 1 formed on a locking plate 120 fixed to the machine frame 1.
21 is selectively engaged and disengaged.

Reference numeral 71 denotes a second angle adjusting means for adjusting the angle of the second transmission case 32, which is a sector gear 72 fixed to the rotating case 40.
A pinion 73 that engages with the gear 72, a rotary shaft 75 that is rotatably supported by a boss 74 on the side of the first transmission case 25 to support the pinion 73, and the rotary shaft 75. To fitting 7
6, an adjusting handle 80 connected via a shaft 77, a joint 78, and a shaft 79. The shaft 79 is supported by the inclined portion 3 of the machine frame 1 via a bearing 81, and is also supported by a locking plate 82 at the rear end of the inclined portion 3 via a bearing 83, as shown in FIG. The adjusting handle 80 is attached to a shaft 79 by a pin 84, and an engaging portion 85 thereof is engageably and disengageably engaged with an engaging hole 86 formed in an engaging plate 82.

In the above structure, during normal work, the first angle adjusting means 64 adjusts and locks the first transmission case 25 in a vertical state, and the second angle adjusting means 71 moves the second angle adjusting means 71 so that the cutting blade 54 becomes horizontal. Adjust the transmission case 32 and lock it. Then, the cutting blade 54, as shown in FIG.
Since it is horizontal on the lower side of the
When the vehicle is driven to move forward while driving the wheels 11 by the traveling motor 12, it is possible to mow weeds and the like at the cutting height of the cutting blade 54.

When mowing the lateral inclined surface 87, the first transmission case 25 may be laterally adjusted around the boss portion 26, as shown in FIG. At this time, the adjustment lever 80
If the link 68 is disengaged from the locking hole 86 of 82 and lowered downward (indicated by arrow a), the link 68 rotates around the support shaft 66, and the first link via the link 71a.
Since the transmission case 25 is pushed in the direction of the arrow b, the first transmission case
25 rotates in the direction of arrow c and the angle changes. And the first
When the adjusting lever 67 is engaged with the engaging portion 121 of the locking plate 120 at a position where the transmission case 25 has a predetermined angle, the first transmission case
25 can be fixed at that angle.

In addition, when carrying out the work of cutting the inclined surface 89 while traveling on the upper surface of the bank 88 or the like, as shown in FIG.
The angle of 25 may be adjusted and the angle of the second transmission case 32 may be adjusted. When adjusting the angle of the second transmission case 32,
Remove the adjustment handle 80 from the locking hole 86 and turn it around. Then, since the pinion 73 rotates, the rotating case 40 and the second transmission case 32 rotate around the boss portion 43 via the sector gear 72 that meshes with the pinion 73, and the cutting blade 54 becomes parallel to the inclined surface 89. . However, at this time, the position of the second transmission case 32 is raised by the amount of the lateral rotation of the first transmission case 25. Therefore, it is necessary to raise the control handle 6 and lower the cutting blade 54.

When carrying, the lock pin 44 is pushed to remove the rotary case 40 from the boss portion 43, the cutting blade 54 and the second transmission case 32 are removed from the first transmission case 25 side, and the whole is disassembled into two.
Then, the handle 6 loosens the bolt 5, and the bolt 5
Rotate it downwards and fold it so that it is close to the wheel 11 side. Therefore, by doing so, it is possible to easily load the trunk of a passenger car or the like.

In this case, the bolt 5 may be removed to remove the handle 6 from the machine frame 1, and the pin 19 may be removed to remove the mounting cylinder 17 from the fixed rod 18, thereby disassembling the entire body into four pieces.

FIGS. 12 and 13 show that when the angle of the first transmission case 25 is adjusted, the second transmission case 32 is interlocked and rotated so that the attitude of the cutting blade 54 is changed as shown in FIG. It was done. That is, the gear 90 that meshes with the sector gear 72 is the first
The adjusting shaft 92 is fixedly mounted on a boss 91 in the center of the transmission case 25, and a lever 93 is fixed to the rear end of the adjusting shaft 92. The lever 93 is connected to the first transmission case via the rod 94.
Bell crank pivotally supported by a pivot 96 on the mounting plate 95 side of 25
It is connected to one end of 97 and the other end of bell crank 97
A nut 99 with a ball joint 98 is attached, and a screw shaft 100 is screwed into the nut 99. Screw shaft 100 is fitting 101, shaft 1
It is connected to the adjustment handle via 02 etc. Therefore,
If you turn the adjustment handle, the screw shaft 100 will rotate and the nut 99
Is operated back and forth, the bell crank 97 rotates around the pivot 96, and the lever 93 is swung left and right via the rod 94. Therefore, the adjustment shaft 92 and the gear 90 rotate, and the angles of the second transmission case 32 and the cutting blade 54 can be adjusted via the sector gear 72.

On the other hand, the bracket 103 of the mounting plate 95 has the first angle adjusting means 6
Four rods 104 are connected, and this rod 104 is connected to one end of a bell crank 106 pivotally supported by a pivot 105 on the machine casing 1. The other end of the bell crank 106 is connected to an adjusting lever (not shown). Therefore, when the bell crank 106 is rotated around the pivot 105 in the direction indicated by the arrow d by the adjusting lever, the first transmission case 25e is moved through the rod 104 and the mounting plate 103.
Since it is pushed in the direction of the arrow, this first transmission case 25 is
Around it, it turns to the right when viewed from the front to a predetermined angle. At this time,
The pivot 96 of the bell crank 97 also moves in the direction of arrow e,
Since the position of the joint 101 is determined by the bearing 107 fixed to the machine frame 1, when the first transmission case 25 rotates to the right, the nut 99 is relatively rearward (via the screw shaft 100) (arrow f). The bell crank 97 rotates about the pivot 96 in the direction indicated by the arrow g, and pushes the lever 93 in the direction indicated by the arrow h via the rod 94. Therefore, the gear 90 rotates in the direction of the arrow i through the adjustment shaft 92, and the second transmission case passes through the sector gear 72.
32, the cutting blade 54 is rotated. Therefore, the first angle adjusting means 64
The angle of the second transmission case 32 can be adjusted simply by adjusting. Of course, only the second transmission case 32 can be adjusted.

In FIG. 14, a snow remover 108 is attached instead of the cutting blade 54. The snow blower 108 includes an auger case 109, an auger 110, a chute 111, a transmission case 112, a support cylinder 113, and a transmission shaft 114, and a flange 115 at the rear end of the support cylinder 113 is detachably attached to the flange 41 of the rotating case 40. It is like this. In this way, it can also be used for snow removal work.

The cutting blade 54 may be a rotary type, and in that case, it may be attached to the lower end of the rotary shaft 34.

(Effects of the Invention) According to the present invention, a first transmission case 25 projecting downward from the engine 21 is provided in the vicinity of the front of the machine frame 1 so that the angle can be adjusted around the front-rear axis center on the upper side. A second transmission case 32, which projects forward from the first transmission case 25 and has a cutting blade 54 at the front end, is provided at the lower end of the case 25 so that the angle can be adjusted around the longitudinal axis, and the second transmission case is also provided. Since 32 is detachably attached to the first transmission case 25 at the rotating portion at the rear end, it is possible to mow the side of the running position and mow the inclined surface such as the shore. Sometimes, there is an advantage that the cutting blade 54 and the second transmission case 32 supporting the cutting blade can be separated from the machine frame 1 side to be compact.

[Brief description of drawings]

1 to 11 show a first embodiment of the present invention. FIG. 1 is a side view of the whole, FIG. 2 is a plan view thereof, FIG. 3 is a front view thereof, and FIG. Sectional view, FIG. 5 is a cutaway side view of the traveling device mounting portion, FIG. 6 is a sectional front view of the rotating portion, FIG. 7 is a sectional plan view of the cutting blade portion, and FIG. 8 is a sectional front view of the angle adjusting portion. Fig. 9 and Fig. 9 are sectional views of the adjusting handle part, Figs. 10 and 11 respectively.
The figure is a diagram for explaining the operation. FIG. 12 is a cutaway side view of an angle adjusting portion showing a second embodiment of the present invention, FIG. 13 is a plan view of the same, and FIG.
The figure is a cross-sectional view of the mounted state of the snow blower. 1 ... Machine frame, 6 ... Steering handle, 8 ... Traveling device, 11
...... Wheels, 21 ...... Engine, 25 ...... First transmission case, 32
…… Second transmission case, 54 …… Mowing blade.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-61-146115 (JP, A) JP-A-61-177915 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. An engine (21) is provided on a machine casing (1) equipped with a traveling device (8) and a steering handle (6), and the engine (21) is provided at a lower front portion of the machine casing (1). In a brush cutter having a driven cutting blade (54) arranged, a first transmission case (25) projecting downward from the engine (21) is provided near the front of the machine frame (1) on the front and rear shafts. The cutting blade (54) is provided at the lower end of the first transmission case (25) so as to be adjustable around the center and protrudes forward from the first transmission case (25) and is provided at the front end.
A second transmission case (32) provided with is provided so that the angle can be adjusted around the front-rear axis center, and the second transmission case (32) can be freely attached to and detached from the first transmission case (25) by the rotating portion at the rear end. A boss portion (43) is provided at a lower end portion of the first transmission case (25), and a boss portion is provided at a rear end rotation portion of the second transmission case (32). A rotating case (40) is provided on the part (43) so as to be detachable and rotatable about the front-rear axis, and a circumferential groove (45) is provided at a connecting portion between the boss part (43) and the rotating case (40). And a lock pin (44) that can be freely engaged and disengaged with the peripheral groove (45), and the lock pin (44) engages with the peripheral groove (45), so that the boss portion (43) ) And the rotation case (40) are prevented from moving in the axial direction, and rotation about the front-rear axis is allowed, and the first transmission case (25) and the second transmission case Between the over scan (32), brush cutter, characterized in that the angle adjusting means for restricting the relative rotation of the two (71) is provided engages detachably.