JPH08196127A - Working machine - Google Patents

Abstract

PURPOSE: To provide a working machine of simple scheme, easy to correct its orientation, excellent in controllability, equipped with a steering mechanism to steer the front wheel of the machine so as to turn the wheel toward the direction of the machine body inclination when the machine body is tilted left or right. CONSTITUTION: This working machine 1 is equipped with a single wheel or front and rear wheels 3 and 4 on the machine body 2 and a steering mechanism 50 to steer the single wheel or the front wheel 3 so as to turn the wheel toward the direction of the machine body inclination when the machine body 2 is tilted left or right. It is preferable that the steering mechanism 50 be made up of a pivot shaft 55 whose upper part is attached swingably to the machine body 2 and is extended backwardly downward and whose lower part supports an axle 18, a longer member 56 whose front part is attached to an intermediate point in the height direction of the pivot shaft 55 and extended backward, and a bush shaft 59 whose upper part is fixed on the machine body 2 and is extended downward and whose lower part supports the rear of the longer member 56 via an elastic bush.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a working machine operated by a handle operated by a walking worker.

[0002]

2. Description of the Related Art An aircraft is equipped with one wheel or two wheels, front and rear,
There are various types of work machines that are operated by the handle operation of a walking worker, such as a mowing machine for mowing ridges, and a hand-pushed single-wheel carrier (commonly called "cat cart") for carrying earth and sand. Exists. For example, as a measure for reducing the labor of rice cropping, an attempt has been made to replace the mowing of ridges with human power from mechanical power, for example, Japanese Patent Laid-Open No. 6-276825 "Mowing Machine and Angle Adjusting Device and Swing Control Device". There is Japanese Utility Model Laid-Open No. 5-9228, “Mower”, which was previously proposed by the present applicant.

According to FIGS. 1 and 3 of the publication, the above is a mower in which a cutter base 2 is attached to a frame F, and a variable cutter base 3 is hingedly connected to the cutter base 2. A rotary blade 43 for cutting the upper surface of the ridge on the base 2.
And a rotary blade 43a for cutting the slope of the ridge is housed in the variable cutter base 3 and is provided with front and rear two wheels (a rear traveling wheel 10 and a front guide wheel 21). The guide wheel 21 is attached to the cutter base 2.

According to FIG. 2 of the publication, is a mower in which a fixed housing 21 is attached to a support frame 7, and a swing housing 25 is hinge-connected to the fixed housing 21, and the fixed housing 21 has a ridge. The main rotary blade 31 for cutting the upper surface is housed, and the sub rotary blade 35 for cutting the slope of the ridge is housed in the swing housing 25. The front and rear two wheels (the rear wheel 3, the front steered wheel 9) are stored. Prepare The steered wheels 9 are steered by a steered control lever 15.

[0005]

Although the rear traveling wheel 10 and the front guide wheel 21 are both rotatably mounted on the side of the machine body 1, the above configuration does not allow steering. For example, when the upper surface of the ridge has irregularities, it may naturally skew. At this time, in general, a walking worker raises the steering wheel 12 to raise the traveling wheels 10.
Correct the direction with the (rear wheel) floating. But,
Since a heavy object (engine or the like) is mounted on the machine body 1, a large amount of labor is required to lift the machine body, which increases a burden on a walking worker. In the above, it is possible to operate the steering operation lever 15 to steer the steered wheels 9. However, if the steering operation lever 15 is further operated while operating the steering wheel 5,
The burden on walking workers is not small. An object of the present invention is to facilitate the correction of the direction of the working machine and the steering.

[0006]

In order to achieve the above object, the present invention provides a working machine equipped with one wheel or two front and rear wheels, which is steered by a handle operation of a walking worker. It is characterized by comprising a steering mechanism for steering one wheel or the front wheels so as to face the inclined direction of the machine body when tilted to the front.

Further, the steering mechanism has an upper portion swingably attached to the machine body and extending rearward and downward, and a lower portion is attached to a pivot shaft that supports an axle, and a front portion is attached to an intermediate portion in a height direction of the pivot shaft. And a bush shaft which is fixed to the machine body and extends downward, and which supports the rear part of the longitudinal member via an elastic bush at the lower part.

Further, the working machine comprises a cutter housing attached to a vehicle body frame having two wheels, a front wheel and a rear wheel, and the cutter housing is composed of a first housing and a second cutter housing hinged to each other. This is a type of mower in which the upper surface of the ridge is cut by a plane blade in the housing and the slope of the ridge is cut by a bevel blade in the second housing, and the front wheels are steered by the steering mechanism.

[0009]

[Operation] When the walking worker notices the skew of the work machine,
The direction of travel is corrected by tilting the machine body to the right or left through the handle and turning the work machine to the right or left.

When the machine body is tilted to the right or left, the lower part of the bush shaft swings in the opposite direction and shakes the rear part of the longitudinal member. Therefore, the wheels are oriented in the tilted direction of the machine body and turn the machine body in the same direction.

When the machine body is tilted to the right or left, the front wheels face in the same direction, which prevents the mower from trying to move to the slope side of the ridge due to the overhang load of the second housing. Therefore, the mowing machine can easily travel straight.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a plan view of a working machine (mowing machine) according to the present invention. A mowing machine 1 as a working machine includes a pipe-shaped body frame (machine body) 2, a front wheel 3 (see FIG. 2), and a rear part. A rear wheel 4 on which a larger-diameter mounting pipe 5 is fitted and fixed to the vehicle body frame 2, the engine 6 is mounted on the mounting pipe 5, and the cutter housing 7 is hung. In addition, the flat blade 10 and the beveled blade 11 are arranged in front and rear and right and left (both of which are seen by an operator) with a space therebetween. The cutter housing 7 is formed by connecting hinges 12 and 12 to a first housing 14 as a fixed side housing and a second housing 15 as a swing side housing. Reference numeral 13 is a swing axis line passing through the hinges 12, 12. 16 is an auxiliary wheel that defines the height of the second housing 15.

The output shaft 6a of the engine 6 faces downward,
The rear wheel 4 is driven via a transmission means (not shown) (for example, a universal shaft, a sprocket, a chain, etc.), and the plane blade 10 and the sloped blade 11 are rotated via a pulley and a belt. Will be described later. In this embodiment, the body frame 2 and the mounting pipe 5 are fixed, but the mounting pipe 5 may be swingable to some extent, so that the first housing 14 may be swingable to some extent. Further, the cutter housing 7 may have any structure as long as it can be attached to the vehicle body frame 2, and not limited to the hanging structure, but may be mounted, for example.

FIG. 2 is a side view (main part) of the working machine (mowing machine) according to the present invention. The front wheel 3 is rotatably attached to the front frame 17 by the axle 18.
Reference numeral 7 is attached to the front portion of the vehicle body frame 2 via a steering mechanism 50. The handle 22 is swingably attached to the rear portion of the vehicle body frame 2, and has a mechanism in which the attachment angle can be changed by replacing the insertion pin 23. 24
... (... indicates a plurality, the same applies hereinafter) is a pin hole, and 2
Reference numerals 5 and 26 are plates.

FIG. 3 is a side view of the steering mechanism according to the present invention. The steering mechanism 50 steers the front wheels 3 so as to face the body frame 2 when the body frame 2 is tilted in the left-right direction. To do. Specifically, the steering mechanism 50
Is fixed to the front part of the body frame 2 with pins 51, 51, and a base 52 extending in the front-rear direction of the mower 1, and an upper part fixed to the front part of the base 52 and extending rearward and downward, A pivot receiving portion 54 having an elastic bearing 53 at a rear lower end thereof.
And an upper portion (upper end of the pivot) 55a is swingably attached to the elastic bearing 53 (swings from the swinging base point P) and is rotatably mounted, extends rearward and downward, and supports the axle 18 at the lower portion 55b. A shaft 55, a longitudinal member 56 whose front part is attached to the middle of the pivot shaft 55 in the height direction (below the swing base point P) and extends rearward, and an upper part which is fixed to the rear part of the base 52 and extends downward. The upper and lower elastic bushes 5 at the bottom
The bush shaft 59 supports the rear portion of the longitudinal member 56 via 7, 58.

The axle 18 is arranged rearward of the elastic bearing 53. The elastic bearing 53 has a cylindrical shape with a bottom, and the upper and lower elastic bushes 57 and 58 have a cylindrical shape. The elastic bearing 53 and the upper and lower elastic bushes 57 and 58 have a cylindrical shape.
Is made of an elastic material such as rubber, and provides resistance to the tilt due to its own elastic force when the body frame 2 is tilted. A flat plate-shaped support plate 61 is fixed substantially horizontally to the rear portion of the longitudinal member 56, and a through hole 61a vertically penetrating the support plate 61 is opened. The bush shaft 59 is fixed to the base 52 by being press-fitted into the mounting seat 63 below the base 52, and has a threaded portion at the lower end. By inserting the upper elastic bush 57, the through hole 61a, the lower elastic bush 58, and the washer 64 into the bush shaft 59 and screwing the nut 65, the rear portion of the longitudinal member 56 is clamped between the upper and lower elastic bushes 57 and 58. , Is attached to the bush shaft 59. The combined structure of the pivot shaft 55 and the longitudinal member 56 constitutes the front frame 17. Incidentally, 66 is a reinforcing material for reinforcing the front frame 17.

FIG. 4 is an exploded perspective view of the steering mechanism according to the present invention, in which the pivot shaft 55 has a fork shape with the front wheel 3 interposed therebetween, and therefore, the pivot upper end 55a and the through hole 6 are provided.
1a is arranged in the center of the front frame 17 in the width direction. Further, the elastic bearing 53 and the bush shaft 59 are arranged at the axial center of the vehicle body frame 2 as shown in FIG. The base 52 is made of a channel material having an upper opening.

FIG. 5 is a front sectional view of a working machine (mowing machine) according to the present invention. A mounting pipe 5 is attached to the vehicle body frame 2, and an engine 6 is mounted on the mounting pipe 5 via a mount plate 27. On the other hand, it shows that the first housing 14 is suspended from the mounting pipe 5 via the hanger brackets 28 and 29, and the second housing 15 is connected to the first housing 14 via the hinges 12 and 12.

Further, in this embodiment, the first belt 31 and the second belt 32, which are the main elements of the belt transmission mechanism 30, are stretched in two steps, and the first belt 31 drives the flat blade 10,
The bevel blade 11 is driven by the second belt 32. The belt transmission mechanism 30 is a mechanism for transmitting the output of the engine 6 to the flat blade 10 and the beveled blade 11, and includes belts 31 and 32 and pulleys described below. In the figure, reference numerals 33 and 34 denote bearing portions having a shaft and a bearing built therein.

FIGS. 6 (a) and 6 (b) are belt transmission mechanism diagrams of the working machine (mowing machine) according to the present invention. FIG. 6 (a) is the upper first belt 31 and related pulleys, and FIG. Second on the bottom
The belt 32 and related pulleys are shown. Belt 3 in FIG.
Since 1 and 32 are overlapped and unclear, they are divided and shown. (A) is a second pulley for driving the first pulley 35 attached to the output shaft 6a of the engine and the plane blade shaft 10a.
A pulley 3 including a pulley 36 and a third pulley 37 which forms a triangular vertex with the first and second pulleys 35 and 36.
It shows that the first belt 31 is wound around 5, 36 and 37. The support shaft 38 of the third pulley 37 is provided upright on the first housing 14.

Further, 39 is a rocking lever locked to the first housing 14 by a pin 39a.
If a tensioner roll 39b is formed at one end of 9 and a brake shoe 39c is formed at the other end, and an operator swings the swing lever 39 in the counterclockwise direction with an operation lever and a wire (not shown), the first belt 31 is tensioned. Then, the power of the first pulley 35 is transmitted to the second pulley 36 to drive the flat blade shaft 10a. On the contrary, when the rocking lever 39 is rocked clockwise, the first belt 31 is slackened and the power transmission is weakened, so that the brake shoe 39c can brake the first belt 31. According to the above procedure, the flat blade 10 can be arbitrarily operated / stopped while the engine is operating and running.

(B) is an idler pulley 41 (hereinafter referred to as "fourth pulley 4") integrally formed below the third pulley 37.
1 "), the sixth pulley 43 for driving the beveled blade shaft 11a, and the idler pulley 42 (hereinafter referred to as the" fifth pulley 42 ") in which the fourth and sixth pulleys 41, 43 both form a triangular vertex. Pulleys 41, 42, 43 consisting of
Indicates that the second belt 32 is wound. In addition,
The support shaft 44 of the fifth pulley 42 is provided upright on the second housing 15. A tensioner roll 46 constantly tensions the second belt 32 with a lever 46c that swings around a spring 46a and a pin 46b.

That is, two idler pulleys 41, 42 are arranged apart from each other on the swing axis 13, and one idler pulley 41 is pivotally supported by the first housing 14 and the other idler pulley 41 is pivotally supported by the other. The idler pulley 42 is pivotally supported on the second housing 15.

The operation of the above-mentioned mower will be described below. FIG. 7 is a rear cross-sectional view of the working machine (mowing machine) according to the present invention, showing a non-oscillating posture in which the beveled blade 11 is parallel (flush) with the plane blade 10. This non-oscillating posture is suitable for traveling on farm roads and for mowing large flat surfaces. At this time, the auxiliary wheel 16 shown in FIG. 1 can be floated from the ground by lifting the second housing 15 by using the chain 47 and the pulley 48 shown by imaginary lines.

FIGS. 8 (a) and 8 (b) show a first embodiment of the present invention.
FIG. 9 is an explanatory diagram of the operation of the second belt, in which (a) is a non-swinging posture,
That is, the second belt 32 is parallel (including substantially parallel) to the first belt 31. (B) shows a swinging posture where the second housing 15 is swung largely downward for the purpose of cutting grass on the slope, and between the fourth pulley 41 and the fifth pulley 42 (range) and the fourth pulley 41. The second belt 32 is twisted between the tensioner roller 46 and the tensioner roller 46 (range). Since the second belt 32 is highly flexible, the twist angle is allowed up to 90 °. Therefore, if it is about 60 ° as shown, there is no problem in transmission and belt life.

FIG. 9 is a view showing the swinging posture of the working machine (mowing machine) according to the present invention, in which the flat blade 10 is provided on the upper surface 71 of the ridge 70.
Are parallel to each other, indicating that the second housing 15 and the inclined blade 11 are inclined along the inclined surface 72. In this posture, the grass on the upper surface 71 of the ridge 70 is mowed by the flat blade 10 and the slope 7
The second grass is cut with the beveled blade 11.

10 (a) to 10 (e) are operation explanatory views (schematic diagrams) of the steering mechanism according to the present invention, and FIG. 10 (a) is a base 52.
Is a side view in which the is tilted to the right (the back side in this figure)
(B) is a view (b) of (a) (however, it is an explanatory view created for convenience), (c) is a view of (a), and (d) is a view of (a). (E) is a plan view of (d). Elastic bearing 5
When the base 52 is tilted rightward in the traveling direction r against the elastic forces of the upper and lower elastic bushes 57 and 58, the pivot receiving portion 54 is moved to the upper end 55a of the pivot 55a in the upright posture as shown in (b). Inclining to the right r in the traveling direction starting from the swing base point P of.

Therefore, as shown in FIG.
Also tilts to the right r in the direction of travel starting from the swing base point P. At this time, the lower part of the bush shaft 59 is tilted to the left 1 in the traveling direction, and the moving distance of the point Q supporting the rear part (support plate 61) of the longitudinal member 56 is δ. Therefore, the bush shaft 59 presses the rear portion (support plate 61) of the longitudinal member 56 in the traveling direction left 1 via the upper and lower elastic bushes 57 and 58. This allows
As shown in (d), since the pivot shaft 55 is rotated about the shaft center of the pivot upper end 55a, the front wheel 3 is tilted to the right r in the traveling direction via the axle 18. The front wheel 3 faces the traveling direction right r as shown in (e), and can travel in the same direction. When the base 52 is tilted to the left 1 in the traveling direction (front side in this figure), the front wheels 3 face the left 1 in the traveling direction, and can travel in the same direction.

11 (a) and 11 (b) are views showing a state in which the working machine (mowing machine) according to the present invention travels in a swinging posture, where (a) is a front view and (b) is a plan view. Is. As shown in (a), the center of gravity of the mower 1 is biased toward the slope 72 side of the ridge 70 due to the influence of the overhang load of the second housing 15. Therefore, the front wheels 3 try to travel along the locus of the traveling line L curved to the left in the traveling direction (on the side of the slope 72) shown in (b). When the front wheels 3 are not tilted, the pedestrian needs to run the grass mower 1 while tilting the grass mower 1 to the side opposite to the slope 52. On the other hand, when the front wheels 3 face the side opposite to the slope 72, they try to travel along the locus of the traveling line R curved to the right in the traveling direction shown in (b). Therefore, as shown in (a), the center CL of the vehicle body frame 2 is taken as the longitudinal axis of the vehicle body, and the handle 2
When the vehicle body frame 2 is tilted in the same direction by tilting 2 toward the side opposite to the slope 72, the front wheel 3 is acted by the steering mechanism 50 so that the front wheel 3 has a substantially straight line shape between the traveling line L and the traveling line R shown in (b). The vehicle travels along the locus of the traveling line S.

As described above, in the mowing machine 1, the front wheel 3 faces the inclined direction of the vehicle body frame 2 only by inclining the handle 22, so that the left and right weight balance is biased (the center of gravity is biased).
When traveling in this state, since the vehicle body 2 travels almost straight on the upper surface 71 of the ridge 70 only by tilting the vehicle body frame 2 in the direction opposite to the deviation of the center of gravity, maneuvering is easy. The same is true when the mower 1 is driven by a ridge having an uneven surface, and the operation is easy.

The working machine of the present invention is provided with one wheel or two wheels on the front and rear sides of the machine body and is steered by a handle operation of a pedestrian. When the machine body is tilted in the left-right direction, one wheel or the front wheel is machined. It is characterized by having a steering mechanism that steers in the direction of tilting, and in addition to a mower, it is a hand-pushed single-wheel carrier (commonly called "cat cart") for carrying earth and sand. Can also be applied. In addition, the second housing 15
It can be applied regardless of the presence or absence of the auxiliary wheel 16 provided in the.

Further, in FIG. 8B, in order to arrange the support shafts 38 and 44 supporting the idler pulley on the swing axis line 13 passing through the hinges 12 and 12, the housings 14 and 1 are arranged.
5, a bulge portion 14a and a cutout portion 15a are formed.
However, by mounting the support shaft 38 twice the outer diameter of the shaft from the swing axis 13 toward the first housing 14, the support shaft 38 is attached to the first housing 1 without providing the bulging portion 14a.
4 can be mounted on. Similarly, the support shaft 44 is mounted on the second housing 15.

[0033]

The present invention has the following effects due to the above configuration. The working machine according to claim 1, wherein the working machine is provided with one wheel or front and rear two wheels, and is operated by a handle operation of a walking worker, and when the machine body is tilted in the left-right direction, one wheel or the front wheel is machined. By providing a steering mechanism that steers the vehicle toward the inclined direction, the walking worker tilts the machine body to the right or left and turns the work machine to the right or left when he notices the skew of the work machine. By doing so, it is possible to correct the traveling direction, so that it is easy to correct the direction of the working machine and the operation is easy.

In a working machine according to a second aspect of the present invention, the steering mechanism has a steering shaft having an upper portion swingably attached to the machine body and extending rearward and downward, and a lower portion having a pivot shaft for supporting an axle and a front portion having a height direction of the pivot shaft. The longitudinal body is attached to the middle and extends rearward, and the upper part is fixed to the machine body and extends downward, and the bushing shaft that supports the rear part of the longitudinal member through the elastic bush at the lower part is formed. When tilted to the right or left, the lower part of the bush shaft swings in the same direction and swings the rear part of the longitudinal member to turn the wheels, which facilitates steering and simplifies the steering mechanism. it can.

A working machine according to a third aspect of the present invention is such that a cutter housing is attached to a vehicle body frame having two wheels, a front wheel and a rear wheel, and the cutter housing is composed of a first housing and a second cutter housing hinged to each other. 1 A mower that cuts the upper surface of the ridge with a flat blade in the housing and a slope blade in the second housing to cut the slope of the ridge. By steering the front wheels with a steering mechanism, Alternatively, tilting to the left, the front wheels will face in the same direction, preventing the mower from attempting to advance to the slope side of the ridge due to the overhanging load of the second housing. Therefore, the mowing machine can easily travel straight.

[Brief description of drawings]

FIG. 1 is a plan view of a working machine (mower) according to the present invention.

FIG. 2 is a side view (main part) of a working machine (mower) according to the present invention.

FIG. 3 is a side view of a steering mechanism according to the present invention.

FIG. 4 is an exploded perspective view of a steering mechanism according to the present invention.

FIG. 5 is a front sectional view of a working machine (mower) according to the present invention.

FIG. 6 is a belt transmission mechanism diagram of a working machine (mower) according to the present invention.

FIG. 7 is a rear cross-sectional view of a working machine (mower) according to the present invention.

FIG. 8 is an operation explanatory view of the first and second belts according to the present invention.

FIG. 9 is a diagram showing a swinging posture of a working machine (mowing machine) according to the present invention.

FIG. 10 is an operation explanatory view (schematic diagram) of the steering mechanism according to the present invention.

FIG. 11 is a diagram showing a state in which the working machine (mower) according to the present invention travels in a swinging posture.

[Explanation of symbols]

1 ... Working machine (mowing machine), 2 ... Airframe (body frame), 3
... front wheel, 4 ... rear wheel, 6 ... engine, 7 ... cutter housing, 10 ... plane blade, 11 ... beveled blade, 12 ... hinge, 14
... first housing, 15 ... second housing, 16 ... auxiliary wheel, 18 ... axle, 30 ... belt transmission mechanism, 50 ... steering mechanism, 52 ... base, 53 ... elastic bearing, 54 ... pivot receiving part, 55 ... pivot Shaft, 55a ... pivot upper end, 56
... Longitudinal member, 57, 58 ... Elastic bush (upper / lower elastic bush), 59 ... Bush shaft, 61 ... Support plate, 61
a ... through hole, 63 ... mounting seat, 70 ... ridge, 71 ... upper surface, 7
2 ... slope.

Claims (3)

[Claims] 1. An aircraft is provided with one wheel or front and rear two wheels,
In a working machine operated by a handle operation of a walking worker, the working machine includes a steering mechanism for steering the one wheel or the front wheel so as to face the tilted direction of the machine body when the machine body is tilted in the left-right direction. A working machine characterized by being. 2. The steering mechanism has an upper portion swingably attached to the body of the vehicle and extending rearward and downward, and a lower portion of a pivot shaft supporting an axle and a front portion thereof attached to the middle of the pivot shaft in the height direction. 2. A longitudinal member extending to the airframe, and an upper portion fixed to the body and extending downward, and a bush shaft supporting the rear portion of the longitudinal member via an elastic bush at the lower portion. Working machine. 3. The working machine comprises a first housing and a second cutter housing in which a cutter housing is attached to a vehicle body frame having two wheels, a front wheel and a rear wheel, and the cutter housings are hinged to each other. A grass mower of a type in which a flat blade in a housing cuts an upper surface of a ridge and a sloped blade in a second housing cuts a slope of the ridge, wherein a front wheel is steered by the steering mechanism. The working machine according to claim 1 or 2.