Work equipment

Abstract

To provide a work machine which can properly perform work in a step of loading, carrying and ejecting a loaded object.SOLUTION: A work machine is equipped with: a steering wheel 21 that can be steered at a first fulcrum part 25 provided at one end side of a machine casing 11, which has a gripping part 22 that a worker can grip at an end part; a working part 31 that can be steered with a second fulcrum part 26 positioned at the other end side of the machine casing 11 as a fulcrum; a travelling part 12, provided in the machine casing 11, which can be positioned between the first fulcrum part 25 and the second fulcrum part 26 to travel on a travelling road surface; and a stand 71, positioned between the gripping part 22 and the first fulcrum part 25 in a planar view, which has a grounding part 72 that grounds the travelling road surface B.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a work machine, and more particularly to a work machine that releases or ejects a loaded object. [Background technology]

[0002] A device that allows an operator to directly apply force to a handle to release or discharge loaded objects is known from the device described in Patent Document 1. According to the invention described in this document, when a handle assembly of a handcart-type transport vehicle is pushed downward toward the user-operated end, the bucket is tilted by a pivoting coupler. When the user then lifts the user-operated end of the handle assembly, which has been lowered downward, the bucket is further raised and discharged. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2006-516498 Summary of the Invention [Problem to be solved by the invention]

[0004] When discharging a load using the device described in Patent Document 1, there is a situation where only the ground support wheels, which are wheels, are in contact with the ground while tilting the bucket to raise it. In other words, there is a situation where the hand truck with the load is supported by only one point where the ground support wheels are in contact with the ground, and the hand truck may lose stability in all directions. There is room for further improvement in the stability of the vehicle during the process of discharging the load. [Means for solving the problem]

[0005] This invention is a handle that can be rotated about a first fulcrum provided on one end of the machine frame and has a grip at its end that can be held by an operator; a working unit that can rotate around a second supporting point located on the other end side of the machine frame; a running section provided on the machine frame and positioned between the first fulcrum section and the second fulcrum section, the running section being capable of running on a running surface; a stand having a grounding portion that is located between the gripping portion and the first fulcrum portion and that comes into contact with a running surface in a plan view; The working department has a bucket portion that can carry an object and be raised by operating a handle; Equipped with A work machine characterized in that one side of the bucket in the traveling direction comes into contact with a dump guide fixed to the machine frame to prevent the one side of the bucket from rising. relates to.

[0006] The present invention further provides: the ground contact portion is located slightly above the running surface when the machine frame is in a horizontal position; A work machine characterized by: relates to.

[0007] The present invention further provides: The ground contact width of the ground contact portion as viewed from the direction of travel is set to be the same as or slightly larger than the ground contact width of the running portion as viewed from the direction of travel. A work machine characterized by: relates to.

[0008] The present invention further provides: the stand includes a third support portion provided on the machine frame and allowing the grounding portion to rotate up and down between a groundable state and a stored state; A work machine characterized by comprising: relates to.

[0009] The present invention further provides: The stand is , contact a restricting member that enables the grounding state to be maintained; A work machine characterized by comprising: relates to.

[0010] The present invention further provides: The handle and the working unit are connected, and the pivoting movement of the handle around the first fulcrum is No. 2 a connecting part that is linked to the pivoting movement of the working part around the fulcrum part; A work machine characterized by comprising: relates to. [Effects of the Invention]

[0011] The present invention provides a work machine that is capable of performing appropriate work in the processes of loading, transporting, and unloading a load. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a side view of a working machine according to an embodiment of the present invention, with the right side being the forward direction. [Figure 2] 1 is a plan view of a working machine according to an embodiment of the present invention, with the right side in the drawing being the forward direction. [Figure 3] 1 is a front view of a working machine according to an embodiment of the present invention. [Figure 4] 1 is a rear view of a working machine according to an embodiment of the present invention, showing the upper part of the handle and the front part of the machine frame, with the working section not shown. [Figure 5] 1 is a side view of a working machine according to an embodiment of the present invention, showing the working unit in a raised state at the moment when the guide pin comes into contact with the dump guide, with the right side in the drawing indicating the forward direction. [Figure 6] 1 is a side view of a working machine according to an embodiment of the present invention, showing a state in which the working unit is in a raised state, the guide pin is in contact with the dump guide, the working unit is further raised, the working unit swings to the right in the traveling direction, and the right end of the working unit in the traveling direction tilts downward. [Figure 7]1 is a front view of a working machine according to an embodiment of the present invention, showing the working unit in a raised state, with the guide pin in contact with the dump guide, and the working unit further raised, swinging to the right in the direction of travel, and the right end of the working unit in the direction of travel tilting downward. The handle, connecting portion, battery, and stand are not shown in the figure. [Figure 8] 1 is a plan view of a working machine according to an embodiment of the present invention, showing the working unit in a raised state, with the guide pin in contact with the dump guide, and the working unit further raised, swinging to the right in the direction of travel, and the right end of the working unit in the direction of travel tilting downward. The handle and connecting portion are not shown. [Figure 9] 1 is an explanatory diagram of a working machine according to an embodiment of the present invention. It is a rear view of the working unit when the rear surface of the link unit is used as a reference. It shows the moment when the guide pin contacts the dump guide as the working unit rises. A part of the machine frame is omitted. The back of the drawing is the direction of travel. [Figure 10] FIG. 1 is an explanatory diagram of a work machine according to an embodiment of the present invention. FIG. 2 is a rear view of the working unit when the rear face of the link unit is used as a reference. FIG. 3 shows the state in which the bucket unit is midway from the central position to the lateral position as the working unit is raised. The guide pin is moving sideways while contacting the dump guide. Part of the machine frame is omitted. The direction of travel is toward the back of the drawing. [Figure 11] 1 is an explanatory diagram of a working machine according to an embodiment of the present invention. It is a rear view of the working unit when the rear face of the link unit is used as a reference. It shows a state in which the working unit swings to the right in the traveling direction as the working unit rises, and the right end of the working unit in the traveling direction tilts downward. A part of the machine frame is omitted. The back of the drawing is the traveling direction. [Figure 12] 1 is a plan view of a working machine according to an embodiment of the present invention, showing the position of the center of gravity in a plan view, with the handle, working unit, and connecting unit not shown. [Figure 13] 1 is a rear view of another embodiment of the stand of the working machine according to the present invention, showing the stand in a state where it can be placed on the ground. A part of the handle, a connecting portion, and a working portion are not shown in the illustration. [Figure 14]1 is a rear view of another embodiment of the stand of the working machine according to the present invention, showing the stand in a state where it can be placed on the ground. A part of the handle, the connecting part, the working part, and a part of the traveling part are not shown in the illustration. [Figure 15] 1 is a rear view of another embodiment of the stand of the working machine according to the present invention, showing the stand in a stored state. A part of the handle, the connecting portion, the working portion, and a part of the traveling portion are not shown in the illustration. DETAILED DESCRIPTION OF THE INVENTION

[0013] A working machine A according to an embodiment of the present invention will be described with reference to the drawings. Reference numeral 11 denotes a machine frame. As shown in Figures 2, 8, and 12, the machine frame 11 is formed in a ring shape in a plan view. Reference numeral 12 denotes a running part. The running part 12 is disposed between a first supporting point part 25 in the center of the machine frame 11 and a second supporting point part 26 in the front part of the machine frame 11. The working machine A can move on a traveling surface B by means of a traveling part 12. In the embodiment of the present invention, the working machine is configured with traveling wheels, but it can also travel with a type of crawler track.

[0014] The running unit 12 may or may not be powered. If the running unit 12 is not powered, pushing the machine frame 11 in the forward / backward direction causes the running wheels or tracks of the running unit 12 to roll on the running surface B, allowing the work machine A to move forward and backward. When the running wheels, which are the running parts 12, are driven to rotate by power, a motor can be placed at the center of the running wheels or in a location separate from the running wheels, and the rotational power generated by this motor can be transmitted to the running wheels to allow the vehicle to move on its own.

[0015] 1, 5, 6, 14, and 15, the running part 12 provided in the front-to-rear center of the machine frame 11 in a side view is a wheel. The machine frame 11 rotatably supports the rotation shaft 13 of the wheel. The machine frame 11 supports the running part 12 so that it can turn freely in the vertical direction. A motor may be provided coaxially with the wheel rotation shaft 13, and the wheel may be configured to receive rotational power from the motor and be rotationally driven. 15 shown in FIG. 12 is the center line of the rotation shaft 13. When the running part 12 is provided by tracks and the tracks are driven to rotate by power, a drive wheel that receives rotational power from a motor or the like and is driven to rotate is disposed on either the front or rear of the inner circumference of the tracks, and a driven wheel is disposed on the other of the front or rear, so that the tracks that receive the driving force are driven to rotate, allowing the work machine A to move on its own.

[0016] A handle 21 is provided on one end of the machine frame 11, which is the rear side. The lower end of the handle 21 is connected to the machine frame 11 and extends upward from a first fulcrum 25 at the lower end. The upper end is provided with a grip 22 that is held by the operator. By operating the grip portion 22, the handle 21 can be rotated freely back and forth or up and down around a first fulcrum portion 25 provided on one end side of the machine frame 11 as an axis.

[0017] When an operator grasps the gripping portion 22 and pushes the machine frame 11 back and forth, the traveling portion 12 rolls on the traveling surface B, and the working machine A including the machine frame 11 can move back and forth. When configured as a self-propelled type, the grip part 22 may have an accelerator lever 23 that turns the rotation of the drive source on and off, and a shift lever 24 that can adjust the rotation direction and rotation speed of the drive source. The work machine A can be self-propelled by simply operating the accelerator lever 23 and the shift lever 24.

[0018] A first fulcrum 25 is provided on the operator's side at the rear end, which is one end of the machine frame 11, and allows the handle 21 to be turned up and down around an axis on the left and right with respect to the direction of travel. The first fulcrum portion 25 is an axis that is positioned rearward of the rotation axis 13 and faces left and right in the traveling direction, and to which the lower end of the handle 21 is attached. The lower end of the handle 21 is connected to the machine frame 11 by a first fulcrum portion 25. The first fulcrum portion 25 allows the upper end side of the handle 21 to swing back and forth or up and down. By operating the grip portion 22, the handle 21 can be rotated freely back and forth or up and down around the first fulcrum portion 25 as an axis.

[0019] Reference numeral 26 denotes a second fulcrum. The second fulcrum is provided at the front position, or front end side, which is the other end of the machine casing 11. The second fulcrum 26 is an axis that is located forward of the rotation axis 13 and faces left and right in the direction of travel, and the working unit 31 is attached to the second fulcrum. A second fulcrum 26 (fulcrum) located at the other end, which is the front of the machine frame 11, allows the working unit 31 located in front of the work machine A to rotate up and down about an axis on the left and right relative to the traveling direction. The bucket part 33 of the working part 31 allows an object W such as earth and sand loaded on the bucket part 33 to be raised and lowered up and down. The working unit 31 is connected to the second supporting point 26 and has a link unit 41 that connects the arm unit 32 and the bucket unit 33 together.

[0020] The arm portion 32 is L-shaped in a side view and is rotatable around the second fulcrum portion 26 in the vertical direction.

[0021] A first link connecting portion 44 is provided at the front end portion, which is one end side, of the arm portion 32. A second link connecting portion 45 is provided at the rear portion of the bucket portion 33 located in front of the arm portion 32. 1, bucket unit 33, which is located at the front end, which is one end side of arm unit 32, is capable of pushing an object W such as soil or sand, or scooping up object W. Furthermore, arm unit 32 and bucket unit 33 are connected by link unit 41, which connects first link connection unit 44 and second link connection unit 45.

[0022] Reference numeral 51 denotes a connecting portion. In this embodiment of the present invention, connecting portion 51 is made of a rod member. Connecting portion 51 connects arm portion 32 and handle 21, connects the other end of arm portion 32 located near second fulcrum portion 26 to the middle portion of handle 21, and connects handle 21 to working portion 31. By connecting the handle 21 and the working unit 31 and connecting the arm unit 32 and the handle 21 with the connecting unit 51, the arm unit 32, which rotates up and down around the second fulcrum 26, and the handle 21, which rotates around the first fulcrum 25, are linked together. The connecting unit 51 links the rotational movement of the handle 21 around the first fulcrum 25 to the rotational movement of the working unit 31 around the second fulcrum 26.

[0023] The handle 21 and working unit 31 swing together via the connecting part 51. In this embodiment, the handle 21 and working unit 31 swing together in the same direction. In other words, when the upper end of the handle 21 is tilted downward toward the rear, the working unit 31 rises, and when the upper end of the handle 21 is raised forward toward the front, the working unit 31 descends. The handle 21 and working unit 31 are connected by a connecting part 51 and are interlocked so that their rotation directions are the same in a side view. Therefore, to raise the working unit 31, the operator simply pushes the handle 21 downward in accordance with gravity. This reduces the force required for operation compared to lifting the handle 21, which is interlocked with the working unit 31, upward against gravity.

[0024] A dump guide 52 is made of a rod-shaped member and is fixed to the front end of the machine frame 11 so as to face horizontally to the left and right in the traveling direction. The dump guide 52 is located near the second fulcrum portion 26 and is located above the guide pin 61 when the working unit 31 is in a grounded state. The guide pin 61 is a member that is provided on the upper part of the bucket unit 33 and protrudes toward the rear. Details of the guide pin 61 will be described later. The dump guide 52 protrudes to either the left or right side of the machine frame 11, and protrudes laterally beyond the rear end of the guide pin 61. In the case of the embodiment of the present invention, the dump guide 52 protrudes to the right in the traveling direction as shown in Figures 2, 3, and 7 to 12.

[0025] Link unit 41 is made up of two link pieces, a first link 42 and a second link 43. In this embodiment, first link 42 is arranged side by side on the right side in the traveling direction, and second link 43 is arranged side by side on the left side in the traveling direction. Link unit 41 is provided between arm unit 32 and bucket unit 33, allowing bucket unit 33 to swing and tilt freely in the left-right direction in the traveling direction relative to arm unit 32. Of working unit 31, bucket unit 33 is provided by link unit 41 so that it can swing and tilt left and right. It can also be said that the first link 42 and the second link 43 connect the first link connecting portion 44 and the second link connecting portion 45 , and that both ends of each are attached inside the working unit 31 .

[0026] The first link connecting portion 44 is provided at the front end of the arm portion 32. As shown in Figures 9 to 11, the first link connecting portion 44 has a first link 42 and a second link 43 arranged side by side in the direction of travel, and the upper portions of each link are connected to the first link connecting portion 44 so as to be able to swing freely in the left-right direction. The second link connecting portion 45 is provided at the rear of the bucket portion 33, which is located in front of the arm portion 32, and below the first link connecting portion 44. As shown in Figures 9 to 11, etc., the second link connecting portion 45 connects the lower portions of the first link 42 and the second link 43, which are capable of swinging left and right relative to the first link connecting portion 44. The link portion 41 is connected to a first link connecting portion 44 that spans the front ends of the pair of left and right arm portions 32 .

[0027] The arm portion 32 rotates in the vertical direction about the second fulcrum portion 26. The upper end of the first link 42 is connected to a first link connecting portion 44, and the first link 42 hangs down from the first link connecting portion 44. Similarly, the upper end of the second link 43 is connected to the first link connecting portion 44, and the second link 43 hangs down from the first link connecting portion 44. The lower ends of first link 42 and second link 43 are connected to second link connecting portion 45 located at the rear lower portion of bucket portion 33 so as to be swingable left and right in the traveling direction. Bucket portion 33 is configured so that its lower portion is suspended by link portion 41 and bucket portion 33 is swingable left and right in the traveling direction and tiltable relative to arm portion 32. The bucket portion 33 is supported by the link portion 41 so as to be swingable in the left and right directions relative to the direction of travel relative to the arm portion 32 .

[0028] Link portion 41 connects arm portion 32 and bucket portion 33, allowing bucket portion 33 to swing freely left and right in the traveling direction, and also allowing bucket portion 33 to be tilted with respect to the traveling direction as shown in Figures 10 and 11. First link 42 and second link 43 are arranged at an angle so that they approach each other from top to bottom, as shown in Figure 9. Link unit 41 has two links, a first link 42 and a second link 43, whose upper ends are connected to a first link connecting unit 44 located at the tip of arm unit 32 using a front-to-rear axis as a fulcrum, and whose lower ends are provided so as to be rotatable in the left-to-right direction. The lower ends of first link 42 and second link 43 are connected to a second link connecting unit 45 located at the rear lower end of bucket unit 33 using a front-to-rear axis parallel to the upper ends as a fulcrum. Bucket unit 33 is connected to arm unit 32 in such a manner that the lower end of bucket unit 33 is suspended from the tip of arm unit 32.

[0029] The link portion 41 forms a four-joint link and connects the arm portion 32 and the bucket portion 33 . Comparing the distance between the upper ends of the link pieces on the arm portion 32 side with the distance between the lower ends of the link pieces on the bucket portion 33 side, the former distance is set larger. This configuration of link portion 41 allows bucket portion 33 to swing freely left and right in the direction of travel, and the more bucket portion 33 swings to either the left or right, the more the left and right ends of bucket portion 33 can be tilted up and down with respect to the direction of travel. In this embodiment, the bucket portion is configured to tilt more significantly as bucket portion 33 swings to the right in the direction of travel, so that the right end of bucket portion 33 is lowered relative to the left end.

[0030] A restriction pin 63 is a rod-shaped member that is positioned rearward from the center of the upper portion of the bucket portion 33 and is fixed integrally with the bucket portion 33. Bucket unit 33 has restriction pin 63 provided from bucket unit 33 toward guide plate 64 when working unit 31 is rotated downward. Restriction pin 63 restricts swinging of bucket unit 33 to the left and right in the traveling direction by being positioned between guide plates 64, and releases bucket unit 33 from restriction by guide plates 64 when working unit 31 is rotated upward.

[0031] The guide plate 64 is made up of two plates, which are fixed to the end of the machine frame 11 and are arranged opposite each other. A pair of guide plates 64 are provided facing each other so as to sandwich the restriction pin 63 from both the left and right sides in the traveling direction. As shown in Figures 7, 9 to 11, the guide plate 64 in this embodiment of the present invention has a round bar serving as a guide member 65 for the restriction pin 63 aligned along its front end. The restricting pin 63 is positioned between the pair of guide plates 64, thereby preventing left and right swinging of the bucket portion 33 and up and down tilting of the left and right ends. This prevention of swinging and tilting is released when the restricting pin 63 moves above the guide plates 64 as the bucket portion 33 rises and is no longer positioned between the pair of guide plates 64.

[0032] 1 and the following drawings, bucket unit 33 is provided at the end of arm unit 32 of working unit 31. Bucket unit 33 can be attached to a travellable work machine A to push or scoop up object W. The bucket portion 33 has a scraper 34 located at the front end of the bucket portion 33 , a loading portion 35 located behind the scraper 34 , and side plates 36 arranged on the sides of the loading portion 35 . 5 to 8, bucket portion 33 has a shape in a side view, in which the front surface of the central portion of the plate-like member is curved in a concave shape to form curved surfaces 37. The left and right side surfaces of bucket portion 33 in the traveling direction are open.

[0033] 1 and subsequent drawings, the scraper 34 is provided at the lower tip of the bucket part 33, which is the front end part of the working part 31. A moving surface is provided on the surface of the scraper 34, which is a surface on which the object W can move. The moving surface is provided so as to be rotatable by the second fulcrum part 26 from a position facing diagonally upward and forward to a position facing diagonally upward and backward. When the working part 31 is lowered, the scraper 34 is brought into contact with the running surface B, and the front end of the scraper 34 can be positioned between the running surface B on which it is running and an object W present on the running surface B.

[0034] The scraper 34 is a plate-shaped member that, when in contact with the travel surface B, is located at the front end of the bucket section 33 and is inclined so as to rise as it approaches the rear in the direction of travel. The front end of the scraper 34 has a linear section extending in the left-right direction, and by moving forward with this linear section in contact with the travel surface B, it scrapes off objects W accumulated on the travel surface B. As the scraper 34 moves forward, the scraped objects W move on the upper surface of the scraper 34 and are pushed into the loading section 35 located at the rear. The scraper 34 is located at the front end of the bucket portion 33 and is inclined so as to rise toward the rear in the traveling direction, so as to peel off the object W from the traveling surface B and to allow the scraped object W to move on the upper surface. The front end of the scraper 34 is formed in a straight line, so that the front end of the scraper 34 can come into close contact with the bottom surface of the groove, and even if the object W is in a highly fluid state, the object W can be neatly peeled off and scooped up from the running surface B. It is possible to prevent the object W from being left on the running surface B after the scraper 34 has passed.

[0035] The loading section 35 will now be described. The bucket unit 33 has a loading unit 35 located behind the scraper 34. In a side view, the loading unit 35 forms a curved surface 37 that protrudes downward from an imaginary extension line of the upper surface, which is the moving surface of the scraper 34, extending rearward, and an object W can be loaded on this curved surface 37. The front part of the loading section 35 is provided with an inclined section 38 which is formed continuously from the rear end of the scraper 34 and is inclined downward as it approaches the rear in the traveling direction. The loading section 35 is located behind the scraper 34, and is therefore capable of loading an object W that has moved rearward on the scraper 34.

[0036] The curved surface 37 will now be described. In a side view, the loading section 35 forms a downwardly curved curved surface 37. The curved surface 37 forms a concave surface on the upward side. In a side view, the curved surface 37 protrudes downward from an imaginary extension line formed by extending the inclined upper surface of the scraper 34 rearward. In other words, it can be said that the loading space in which the objects W are loaded onto the loading section 35 intersects with the imaginary extension line. Because the curved surface 37 is located below the upper surface of the scraper 34, the objects W that move along the scraper 34 and reach the rear end of the scraper 34 fall onto the loading section 35. The objects W then move sequentially from the scraper 34 toward the lower concave portion of the curved surface 37, and are loaded onto the loading section 35.

[0037] The guide portion 361 will be described. The scraper 34 has a guide portion 361 at the end in the width direction relative to the direction of travel of the scraper 34, which is provided in the center of the loading section 35 so as to be able to guide the object W. The guide portions 361 are provided on both the left and right ends of the rear portion of the scraper 34. The guide portions 361 are inclined upward so as to bend the ends of the scraper 34. Therefore, the object W moving on the upper surface of the scraper 34 can be guided to the center of the loading section 35 without dropping off the side ends of the scraper 34.

[0038] The side plate 36 will now be described. The bucket section 33 has side plates 36 arranged on the sides of the loading section 35. The side plates 36 prevent the object W loaded on the loading section 35 from falling from the loading section 35. The side plates 36 are made of plate-like members, and are arranged with the faces of these plate-like members upright at both widthwise ends of the loading section 35, on the front side of the loading section 35. The side plates 36 are arranged to cover both widthwise ends of the lower part of the curved surface 37 formed by the loading section 35. Therefore, the side plates 36 are arranged in a container-like shape from the front to the middle of the loading section 35, and therefore, even when the objects W are in a highly fluid state, the objects W can be prevented from spilling out of the loading section 35.

[0039] The opening 39 will now be described. An opening 39 is provided at the rear of the loading section 35 and at the end in the width direction in the traveling direction, so that the loaded object W can fall from the loading section 35. In the working state, the opening 39 is located behind the side plate 36 and above the loading section 35. The function of the opening 39 will now be described. As described above, in the working state, the objects W are loaded on the front side of the loading section 35. At this time, the objects W are gradually loaded and accumulated below the curved surface 37 of the loading section 35. Even if the objects W are in a highly fluid state, they will not spill out of the loading section 35 due to the inclined portion 38 and side panel 36.

[0040] When the working unit 31 including the bucket unit 33 is rotated around the second fulcrum unit 26, the front side of the loading unit 35 rises relative to the rear part, and eventually the rear part moves to the lowest end of the curved surface 37. Then, the object W located on the front side of the loading unit 35 moves due to gravity to the rear side of the loading unit 35 as the working unit 31 rises. When loading unit 35 is further raised, either the left or right end of bucket unit 33 rotates upward or downward via link unit 41, and object W located on the rear side of loading unit 35 moves in the direction of gravity. Because object W moves to opening 39 located below side plate 36 in the direction of gravity, object W can fall from bucket unit 33 without being blocked by side plate 36.

[0041] The inclined portion 38 will now be described. The front of the loading section 35 is formed so as to be continuously bent from the rear end of the scraper 34, and is provided with an inclined section 38 that is inclined downward as it approaches the rear in the direction of travel. The inclined section 38 can prevent the object W loaded on the loading section 35 from moving forward. To give an example based on actual work, even if the vehicle stops while traveling forward with an object W loaded on the loading section 35, the object W can be prevented from moving relative to the forward scraper 34 due to inertia from the loading section 35. Since the object W with a particularly high fluidity tends to move more easily on the loading section 35 due to inertial force, the inclined section 38 can effectively block the object W. In this embodiment of the present invention, the inclined portion 38 is provided linearly in a side view, but the effect of the inclined portion 38 remains the same even if it is curved downward toward the rear in the traveling direction.

[0042] The function and effect of the bucket portion 33 will be described. Bucket unit 33 can efficiently scoop up and load object W regardless of its state onto bucket unit 33. Even when bucket unit 33 is simply configured, it can be configured to enable discharge work from opening 39 without adding any special equipment. Bucket unit 33 is configured to be able to rotate up and down and swing left and right, so that object W can move above bucket unit 33 by the action of gravity and can be discharged from above bucket unit 33 through opening 39. In the embodiment, the work machine A is shown as working in a gutter, and the running surface B refers to the bottom surface of a gutter or the like, but it is not limited to guttering, and can be used in any work location and running surface.

[0043] Reference numeral 61 denotes a guide pin. The guide pin 61 is fixed to the upper part of the bucket part 33 of the working part 31 as shown in Figures 9 to 11 and others. In this embodiment, the guide pin 61 protrudes rearward from the upper part of the bucket part 33, and a pair of bifurcated guide pins are provided symmetrically on the left and right sides with respect to the direction of travel. As the working unit 31 is raised, the guide pins 61 rise relative to the dump guides 52, and eventually one of the guide pins 61 comes into contact with the dump guide 52. At this time, the restricting pin 63, which was positioned between the guide plates 64 until the working unit 31 was halfway raised, is positioned above the guide plates 64, and the blocked state of the bucket unit 33 against left and right swinging and the left and right ends thereof against up and down tilting is released. 5 to 11, guide pin 61 fixed to working unit 31 rises as working unit 31 rises, and when it reaches a certain raised position, it comes into contact with dump guide 52 fixed to machine frame 11. If working unit 31 is further raised after guide pin 61 comes into contact with dump guide 52, continued contact between guide pin 61 and dump guide 52 prevents the bucket unit 33 on the side with which dump guide 52 comes into contact from rising, as shown in FIGS. 6 to 11. In this embodiment of the present invention, the bucket unit 33 of working unit 31 on the right side in the traveling direction is prevented from rising.

[0044] 6 to 11, on the side where the guide pin 61 and the dump guide 52 are not in contact, the bucket section 33 on the left side in the direction of travel is not prevented from rising. Therefore, when the working unit 31 is raised with the guide pin 61 and the dump guide 52 in contact, the right end of the bucket section 33 supported by the link section 41, which is the side where the guide pin 61 and the dump guide 52 are in contact, tilts downward and begins to swing to the right in the direction of travel on the side where the guide pin 61 and the dump guide 52 are in contact, as shown in FIGS. 6 to 11. During the raising or lowering of the working unit 31 with the guide pin 61 and the dump guide 52 in contact, the guide pin 61 moves in the left-right width direction relative to the dump guide 52 in the direction of travel while the guide pin 61 and the dump guide 52 remain in contact.

[0045] 9 to 11, etc., denotes a bracket 62. Bracket 62 is formed on the upper part of bucket portion 33 so as to cover the upper part to the rear of first link connecting portion 44 in side view, and protects first link connecting portion 44 and the upper part of link portion 41. A guide pin 61 and a restriction pin 63 are provided on a bracket 62 formed on the upper part of the bucket unit 33. The guide pin 61 is made of a rod-shaped member, with the rear end protruding slightly rearward and to the left and right. In the embodiment of the present invention, the guide pin 61 protrudes in a bifurcated shape, protruding slightly rearward and to the left and right. The guide pin 61 and the restriction pin 63 are fixed integrally to the bucket unit 33, and therefore rise and fall as the working unit 31 rises and falls. The guide pin 61 is provided on the bucket section 33, and when the working section 31 swings upward, it comes into contact with the dump guide 52, thereby forcibly tilting the bucket section 33.

[0046] The positional relationship between the guide pin 61 and the dump guide 52 will be described. 1, l1 is the distance from the second fulcrum portion 26 to the tip of the guide pin 61. In the same Figure, l2 is the distance from the second fulcrum portion 26 to the dump guide 52. When the second fulcrum 26 in a side view is used as a reference, as shown in FIG. 1 and subsequent drawings, the distance l2 from the second fulcrum 26 to the dump guide 52 is longer than the distance l1 from the second fulcrum 26 to the rear end of the guide pin 61. In other words, the turning radius of the rear end of the guide pin 61, which is integral with the working unit 31 that turns up and down around the second fulcrum 26, is located closer to the second fulcrum 26 than the dump guide 52. This means that when the working unit 31 turns up and down around the second fulcrum 26, the rear end of the guide pin 61 will eventually come into contact with the dump guide 52.

[0047] By raising the working unit 31, the guide pin 61 comes into contact with the dump guide 52 as shown in Figures 10 and 11, and by further raising the working unit 31, the bucket unit 33 can be tilted to the right in the direction of travel. Even if the ascent of the working part 31 is stopped midway after the bucket part 33 has swung or tilted, the dump guide 52 is located above the guide pin 61 to regulate the ascent of the guide pin 61, so that the bucket part 33 can be prevented from returning to its original position.

[0048] 9 is the instantaneous center. The instantaneous center o is the center of rotation that determines the inclination of bucket unit 33, which is working unit 31. When bucket unit 33 swings by first link 42 and second link 43, bucket unit 33 rotates around the axis of instantaneous center o, which is the virtual center formed by first link 42 and second link 43. 13 and 14 shown in FIG. 9 are virtual straight lines that are extensions of the line segment connecting the rotation fulcrum of second link 43 and the line segment connecting the rotation fulcrum of first link 42, respectively. In FIG. 9, this is the moment when the guide pin 61 comes into contact with the dump guide 52, and the tilting movement of the bucket portion 33 around the instant center o has not yet started.

[0049] 9 to 11, the instantaneous center o is the intersection of imaginary lines l3 and l4 that connect the first link connecting portion 44 and the second link connecting portion 45 via the first link 42 and the second link 43. The instantaneous center o, which is the center of rotation of the tilt of the bucket portion 33, changes its position relative to the bucket portion 33 depending on the tilt position and swing position of the bucket portion 33. When the working unit 31 is raised, the trigger for the swinging or tilting of the bucket unit 33 is generated by contact between the guide pin 61 and the dump guide 52. Thereafter, the swinging or tilting movement is generated by the link mechanism formed by the first link 42 and the second link 43. The tilt of the bucket unit 33 is generated by rotation around the instantaneous center o, which is the center of rotation, which is an imaginary point formed by the first link 42 and the second link 43. The instantaneous center o shown in FIG. 9 is located below the left-right center of the bucket unit 33 in the direction of travel.

[0050] Then, as the working unit 31 is further raised, the instantaneous center o moves upward and to the right of the bucket unit 33 in the relative direction of travel, approaching the second link connection portion, as shown in Fig. 10. As the working unit 31 is being raised, the bucket unit 33 swings laterally due to the first link 42 and the second link 43, and also tilts around the moving instantaneous center o as an axis. As shown in Figs. 9 to 11, the bucket unit 33 can be tilted significantly left and right by the movable instantaneous center o on the side of the bucket unit 33.

[0051] By further raising the working unit 31 from the state shown in FIG. 9, the second link connecting portion 45 is raised to the state shown in FIG. When the working unit 31 is further raised from the state shown in FIG. 10 , the second link connector 45 is further raised relative to the first link connector 44, as shown in FIG. 11 , compared to the states shown in FIGS. 9 and 10 , causing the bucket unit 33 to swing laterally. The bucket also tilts around the moving instantaneous center o. Compared to FIG. 10 , the instantaneous center o in FIG. 11 moves slightly to the right of the relative center of the bucket unit 33 and above the second link connector 45. As shown in FIG. 11 , the instantaneous center o, which is located slightly in the center of the bucket unit 33, allows the bucket unit 33, at the rearmost position of the upward movement, to perform an action that appears to tip over on the spot. This allows the bucket unit 33 to shake off the object W from above the bucket unit 33. The object W on the bucket unit 33 can be ejected from the bucket unit 33 through the opening 39.

[0052] In this embodiment, when the working unit 31 is raised to the top, the first link 42 rotates until the longitudinal direction of the first link 42 reaches a position relatively below the bottom surface of the second link connecting portion 45, as shown in FIG. However, it is sufficient that the inclination angle of the bucket portion 33 when swinging at the link portion 41 is large enough to allow the object W to slide down, and it is not necessarily the case that the first link 42 rotates in the opposite direction relative to the second link connection portion 45.

[0053] The link portion 41 is formed so that the lower distance is smaller than the upper distance, which is the relative distance between the first link 42 and the second link 43 in the working state. As a result, by raising the working unit 31, one link of the link portion 41 bends in the opposite direction relative to the second link connecting portion 45, or bends until it approaches the opposite direction, as shown in Fig. 11, from the state shown in Fig. 9 through the state shown in Fig. 10. By configuring it in this manner, the angle of inclination of the bucket section 33 can be increased as the bucket section 33 moves to the end of its swinging motion in the left-right direction, and the object W on the bucket section 33 can be efficiently discharged to the side of the aircraft body.

[0054] The configuration of link unit 41 allows the tilting speed of bucket unit 33 to increase as it approaches the swing end of bucket unit 33. Bucket unit 33 swings sideways, and object W on bucket unit 33 located at the swing end can be ejected by being thrown off with force to the side of the aircraft body, as shown in Figures 6 and 7.

[0055] The functions of the guide pin 61 and the dump guide 52 will now be described. As the machine advances with the front end of bucket unit 33 in contact with traveling surface B, it scrapes up objects W, such as soil and sand, into bucket unit 33, as shown in Figure 1. Thereafter, when arm unit 32 is rotated upward about second fulcrum unit 26 as an axis, link unit 41 and bucket unit 33 also rotate upward at the same time. Bucket unit 33 is restricted in its movement in the left and right directions relative to the traveling direction by guide plate 64 and restricting pin 63, so it cannot swing or tilt left and right relative to arm unit 32 in the traveling direction. Therefore, the tip of scraper 34 of bucket unit 33 rises parallel to traveling surface B or machine frame 11.

[0056] As the arm portion 32 continues to pivot upward, the rear end of the guide pin 61 fixed to the blade portion comes into contact with the dump guide 52. In this embodiment of the present invention, one of the right guide pins 61 comes into contact with the protruding portion on the right side of the dump guide 52. When the arm portion 32 is further rotated upward, the restricting pin 63 appears from the upper end of the guide plate 64 in a side view, and the state in which the guide plate 64 and the restricting pin 63 prevent the bucket portion 33 from swinging left and right and tilting is released.

[0057] 10 and 11, when arm portion 32 is further rotated upward, guide pin 61 is engaged by dump guide 52, restricting the upward movement of the rear end portion of guide pin 61. Furthermore, bucket portion 33 to which guide pin 61 is fixed is enabled to swing left and right and tilt up and down by link portion 41. Therefore, when dump guide 52 forcibly presses down on the rear end portion of guide pin 61, bucket portion 33 supported by link portion 41 begins to swing left and right, and the left and right ends begin to swing up and down. In the illustrated embodiment of the present invention, the bucket section 33 is offset to the right in the traveling direction relative to the machine frame 11 and is inclined so that the right end of the bucket section 33 is lower than the left end.

[0058] Therefore, as shown in Figures 6, 7, and 8, the collected objects W on the bucket portion 33 slide down according to the inclination of the inclined bucket portion 33 and are discharged from the opening 39. In addition, because either the left or right end of the bucket portion 33 on the side where the objects W slide down is offset to the left or right in the direction of travel, the objects W can be discharged to a position that does not block the direction of travel of the machine body 11. The bucket portion 33 shown in the figures is offset to the right in the direction of travel so that the right end of the bucket portion 33 slopes downward, but by arranging the dump guide 52 to protrude on the opposite side, that is, the left side, and bringing the other left guide pin 61 into contact with the dump guide 52, the objects can be offset to the left, opposite to that shown in the example, and the left end can be tilted downward. After the object W has been discharged, the arm unit 32 is lowered, and the bucket unit 33 can be lowered while swinging and tilting back to its original position by following the reverse steps of the procedure for raising the working unit described above.

[0059] In this embodiment of the present invention, the worker can lift the object W loaded on the bucket portion 33 and discharge the object W to a distant position to the side by simply pressing down the gripping portion 22.

[0060] In the description of the embodiment of the present invention, the loading of the object W onto the working unit 31 and the unloading of the object W from the working unit 31 are performed by an operator. However, the present invention can be implemented even without the handle 21 operated by the operator. By connecting a drive source such as a cylinder or a motor directly to the arm unit 32 or to the connecting unit 51 or the handle 21 connected to the arm unit 32 and simply moving the arm unit 32 up and down, the bucket unit 33 can be swung left and right and tilted up and down. In other words, by assisting the up and down movement of at least the bucket unit 33 with a drive source, a mechanism for unloading the object W can be configured, thereby simplifying the configuration of the work machine A.

[0061] The functions of the scraper 34 and the bucket portion 33 will now be described. 1, as the scraper 34 advances, the object W is scraped off from the travel surface B, and an object W ahead of the object W scraped off from the travel surface B, which moves relatively, pushes the object W scraped off from the travel surface B onto the upper surface of the scraper 34. In this way, the object W, such as soil or sand, can be moved to the upper surface of the bucket unit 33 and scooped up.

[0062] The distance between the middle part of the handle 21 where the first fulcrum 25 and the connecting part 51 are connected and the distance between the second fulcrum 26 and the other end of the arm part 32 are set to be larger. This allows the rotation angle of the working part 31 to be larger than the rotation angle of the handle 21 when the handle 21 swings. That is, the operator can swing and raise the working unit 31 by grasping the grip portion 22 and pushing down the handle 21 a short distance. In the embodiment of the present invention, the operator pushes down the grip portion 22 at the upper end of the handle 21, causing the working unit 31 to swing upward. The working unit 31 that swings upward can be positioned above the traveling surface B.

[0063] An operation using a working machine A, which is an embodiment to which the present invention is applied, will now be described. When the operator grasps the gripping portion 22 of the handle 21 and lifts the handle 21, the working unit 31 descends. When the tip of the scraper 34 comes into contact with the traveling surface B, the descent of the working unit 31 stops and the upward and forward rotation of the handle 21 is also restricted.

[0064] When the worker grips the gripping portion 22 and moves forward, the work machine A moves forward. Since the handle 21 is also restricted from rotating forward by the contact between the scraper 34 and the running surface B, as long as the worker grips the gripping portion 22 and moves the work machine A forward, the scraper 34 will maintain contact with the running surface B and the work machine will move forward.

[0065] When the scraper 34 advances while in contact with the traveling surface B, as shown in Fig. 1, the tip of the scraper 34 gets between the traveling surface B and the object W positioned above it, and is able to peel the object W off the traveling surface B. If the work machine A continues to advance further, the object W is pushed by the object W moving relatively from the front, and moves onto the upper surface of the scraper 34. If the work machine A continues to advance further, the object W moves onto the curved surface 37 of the bucket portion 33 and is placed thereon.

[0066] After a desired amount of object W has been placed on the curved surface 37 of the bucket 33, the worker stops moving forward and pushes down on the gripper 22, causing the working unit 31 to swing upward around the second fulcrum 26. Because the working unit 31 swings upward at a larger swing angle than the swing angle around the first fulcrum 25 of the handle 21, the worker can scoop up the object W above the travel surface B without making any large movements with the gripper 22.

[0067] 71 is the stand. The stand 71 is provided at the rear of the machine casing 11 near the first fulcrum 25 or behind the first fulcrum 25 in the direction of travel. The stand 71 has a ground contact part 72 that is positioned between the gripping part 22 and the first fulcrum 25 in the direction of travel and that contacts the running surface B, in the side view of FIG. 1 and the plan view of FIG. 2. The ground contact portion 72 is positioned slightly above the running surface B, and prevents the machine frame 11 from rotating backward around the center line 15 of the rotation shaft 13, which is the rotation shaft of the running portion 12. 13 to 15, the stand 71 can be provided with a third fulcrum portion 74 on the machine frame 11 so that the lower end side can be rotated up and down. The stand 71 can be rotated down to a ground-contact state where the ground contact portion 72 can be placed in contact with the running surface B, and the stand 71 can be rotated up and down to a stored state where the ground contact portion 72 cannot be placed in contact with the running surface B. When the machine is in a ground-contactable state, the vertical movement of the machine frame 11 can be restricted.

[0068] By storing the stand 71, it is possible to prevent the lower end of the stand 71 from becoming an obstacle and preventing the running unit 12 from moving smoothly when traveling on a running surface B with large irregularities, such as a rough road where the running surface B has an irregularity height that is one-third or more of the height of the running surface B and the running unit 12. The configuration of another embodiment will be described in detail later.

[0069] The ground contact portion 72 shown in FIGS. 1 and 4 to 6 is located slightly above the running surface B when the machine frame 11 is in a horizontal position. As shown in FIG. 4, the ground contact width 721 of the ground contact portion 72 as viewed from the direction of travel is set to be the same as or slightly larger than the ground contact width 121 of the running portion 12 as viewed from the direction of travel. The ground contact portion 72 is provided so that the lower end of the stand 71 can contact the traveling surface B, and the ground contact portion 72 contacts the traveling surface B behind the first fulcrum portion 25 and in front of the grip portion 22 in the traveling direction. In a side view, the ground contact portion 72 is located between the grip portion 22 and the traveling direction. When working unit 31 is raised, there are two points in contact with running surface B: running unit 12 and ground contact portion 72. Therefore, when the gripping portion 22 side of handle 21 is pushed downward to raise working unit 31, ground contact portion 72 comes into contact with running surface B, preventing the rear end of machine casing 11 from sinking downward.

[0070] That is, the front and rear ends of the machine frame 11 do not swing up and down significantly, so the handle 21 operated by the operator does not swing back and forth or up and down. In other words, the operator can operate the grip portion 22 stably. When the machine frame 11 is in a horizontal position, the ground contact portion 72 is positioned slightly above the traveling surface B. When the work machine A moves forward using the traveling portion 12, it is not dragged, so its progress is not impeded.

[0071] The ground contact width 721 of the stand will be described. 4, when viewed from the direction of travel, ground contact width 721 of the stand of ground contact portion 72 is set to be the same as or larger than ground contact width 121 of the running part. Because the ground contact area on the handle 21 side is set to be larger on both sides, even if the worker grips grip portion 22 and turns handle 21 around first fulcrum portion 25, work machine A does not easily swing left and right and remains stable. Furthermore, even if the ground contact portion 72 and working portion 31 are swung and tilted left and right and the center of gravity including the load moves to the side from the center of the work machine A, this center of gravity can be positioned within the area S surrounded by the ground contact portion of the traveling portion 12 and the ground contact portion 72 of the stand 71 in the plan view shown in Fig. 12. Therefore, even when the work of discharging the loaded object W is being carried out, the work machine A can continue to work stably without tipping to the left or right side relative to the direction of travel.

[0072] 13, 14 and 15 are views showing another embodiment of the stand of the present invention. A restricting member 73 of the another embodiment will be described. The stand 71 is rotatable about an axis to the left and right relative to the direction of travel by a third fulcrum 74 located near the first fulcrum. In another embodiment, the third fulcrum 74 is located behind the first fulcrum. The stand 71 is provided with a restricting member 73 that enables the stand 71 to maintain a ground-contact state. As shown in Figures 13 and 14 which show another embodiment of the stand 71, the regulating member 73 is made of a rod formed in a U-shape when viewed from behind, and the lower end is provided on the side of the stand 71 so as to be able to rotate freely. Reference numeral 75 denotes a restricting position. At the restricting position 75, the end of the restricting member 73 is restricted. When the stand 71 is in a ground-removable state, the restricting member 73 restricts the stand 71 from rotating upward by positioning the upper end side at the restricting position 75 located near the third fulcrum portion 74, thereby maintaining the attitude of the stand 71 in a ground-removable state. This prevents the stand 71 from unexpectedly shifting to a stored state, allowing the work machine A to perform work stably.

[0073] Reference numeral 76 denotes an elastic body. The elastic body 76 constantly biases the stand 71 to rotate upward. In other words, it constantly applies a force in the direction of moving the stand 71 to the stored state. The elastic body 76 is located near the third fulcrum portion 74, and the regulating member 73 prevents the stand 71 from transitioning to the stored state, allowing it to maintain its posture in a ground-contact state. In this embodiment, the elastic body 76 and the regulating member 73 are provided on the right side of the stand 71 in the direction of travel, but at least one is sufficient, and they may be located on the left side or both sides. In another embodiment, a coil spring is used as the elastic body 76, but the shape and form are not limited to those shown in the drawings.

[0074] 13, 14, and 15, the regulating member 73 also has a regulating member elastic body 77. The regulating member elastic body 77 is provided at the rotation fulcrum portion on the lower end side of the regulating member 73, and is provided so that, in a side view, the upper end side of the regulating member 73 faces the ground contact portion 72 after rising up relative to the stand 71. The regulating member elastic body 77 weakens the biasing force to such an extent that it does not inhibit the force with which the elastic body 76 located near the third fulcrum portion 74 biases the stand 71. Therefore, the posture of the stand 71 does not change when the stand 71 is in the ground contact state or the stored state.

[0075] The functions of the grip portion 22 and the handle 21 will now be described. When an operator grasps the gripping part 22 and pushes the gripping part 22 forward, the working part 31 descends relative to the machine casing 11, and the front end of the working part 31 touches the ground. The forward rotation of the handle 21 is then restricted in conjunction with the working part 31 touching the ground. When the operator pushes the gripping part 22 forward while the front end of the working part 31 is in contact with the ground, the working machine A moves forward with the working part 31 in the contact state. The forward movement of the working part 31 in the contact state gathers up the object W, and the object W is loaded onto the working part 31.

[0076] If the operator unintentionally collides the front end of working unit 31 with an obstacle or the like while moving forward, the front end of casing 11 will tend to lift upward, with the center line l5 of rotation shaft 13 of running unit 12 as a fulcrum. In other words, the rear part of casing 11 will tend to move downward, and so gripping portion 22 of handle 21, together with first fulcrum portion 25, will also tend to move downward, with the center line l5 of rotation shaft 13 as a fulcrum. At this time, the ground contact portion 72 located at the rear of the rotation shaft 13 comes into contact with the travel surface B, preventing the rotation of the machine casing 11 about the center line 15 of the rotation shaft 13 and maintaining the machine casing 11 in a substantially horizontal position. When a collision occurs with an obstacle, the gripping portion 22 is not swung up and down, and the forward movement relative to the travel surface B can simply be stopped. Even though the handle 21 is freely rotatable by the first fulcrum portion 25, the operator can receive tactile information directly via the handle 21 that an obstacle has collided with the front end of the working unit 31. As a result, the operator can smoothly perform loading operations onto the working unit 31 and transport operations using the working unit 31 without any delays.

[0077] 15, to shift the stand 71 to the stored state, the restricting member 73 is operated to remove the upper end from the restricting position 75, thereby releasing the position restriction, and then the stand 71 is rotated by being biased upward by the elastic body 76. When the stand 71 is in the stored state, the contact portion 72 is lifted by the elastic body 76 to the vicinity of the bottom of the machine casing 11.

[0078] In this embodiment of the present invention, the weight is constituted by a battery 91 capable of storing energy for operating the running unit 12. The weight is placed on the ground so as to be positioned rearward of the first fulcrum portion 25. The rear end of the weight is positioned at the same position as the grip portion 22 in the direction of travel, or forward in the direction of travel.

[0079] The weight consisting of the battery 91 is provided in a box shape and is located at the rear of the machine casing 11, rearward in the direction of travel from the first fulcrum 25. The rear end of the machine casing 11 extends rearward from the first fulcrum 25 to form a weight platform on which the weight is placed. The grip portion 22 of the handle 21, which is rotatably disposed on the first fulcrum portion 25, is located above the weight. The rear end of the weight is located forward of the grip portion 22 in the direction of travel or at the same position as the grip portion 22 in a plan view or side view. In other words, the rear end of the weight does not protrude rearward in the direction of travel from the grip portion 22, and therefore does not interfere with the walking of the worker holding the grip portion 22. In this embodiment, the weight is composed of a battery 91 that can store energy to operate the traveling unit 12 and the control device that operates it. Therefore, there is no need to provide the battery 91 and the weight separately, and the entire machine body A can be simply configured.

[0080] The center of gravity shown in Figure 1 and subsequent figures will now be explained. Gw is the center of gravity of the battery 91 alone. Gt1 is the center of gravity of the entire machine body A, and is the position when the working unit 31 is in the lowered position and empty. Gt2 is the center of gravity of the entire machine body A, and is the position when the working unit 31 is in the lowered position and the object W is loaded. Gt3 is the center of gravity of the entire machine body A, and is the position when the working unit 31 is in the ascending / descending position (midway up) and the object W is loaded. Gt4 is the center of gravity of the entire machine body A, and is the position when the working unit 31 is at the highest raised and lowered position and the object W is loaded. Gt5 is the center of gravity of the entire machine body A, and is the position when the working unit 31 is at its highest raised and lowered position and empty. S is the area surrounded by the ground contact portion 72 and the ground contact portion of the running portion 12 .

[0081] The center of gravity Gw of the weight alone is located behind the first fulcrum 25 in the direction of travel and ahead of the gripping portion 22. Furthermore, when the stand 71 is provided, the center of gravity Gw of the weight alone is located behind the ground contact portion 72 of the stand 71 in the direction of travel and ahead of the gripping portion 22. In addition, the center of gravity Gw is located in the center of the work machine A in the left-right direction in a plan view. As shown in FIG. 1 and subsequent drawings, the center of gravity Gw of the weight is located between the grip portion 22 and the first fulcrum portion 25 in the direction of travel.

[0082] The center of gravity Gt1 of the entire structure including the weight is located behind the rotation axis 13 of the traveling part 12 and in front of the first fulcrum part 25 in the traveling direction. The overall center of gravity changes position between the rotation axis 13 of the running part 12 and the first fulcrum part 25, as shown in Figures 1, 5, 6, and 12, depending on whether or not there is a load on the working part 31 and whether or not the working part 31 is raised or lowered.

[0083] The center of gravity Gt1 of the entire machine body A, which is the position when the working unit 31 is in the lowered position and empty, will be described. When the working unit 31 is empty (no object W is loaded) and in a lowered position, the center of gravity Gt1 of the entire machine body A is located midway between the first fulcrum 25 and the rotation axis 13 in the direction of travel, and slightly above the rotation axis 13 in the vertical direction. The presence of the battery 91, which acts as a weight, prevents the working unit 31 from sinking downward when the gripper 22 is not being gripped. The placement of the battery 91 suppresses the swinging of the casing 11 of the work machine A in the forward and backward directions around the rotation axis 13 as a fulcrum, thereby achieving balance. When a worker grasps the gripper 22 and moves forward, the worker naturally pushes the gripper 22, which swings around the casing 11 side where the swinging is suppressed, forward. However, the working unit 31, which rotates around the casing 11 in conjunction with this, is stably pushed downward. This allows the worker to accompany the work machine A while stably holding the gripper 22.

[0084] Therefore, the front-to-rear balance of the work machine A is not significantly disrupted whether the work machine A is being operated or not. Furthermore, when the stand 71 is in a state where it can be placed on the ground, the center of gravity Gt1 is located forward of the ground contact portion 72 and rearward of the rotation axis 13. Furthermore, in a plan view, the center of gravity Gt1 is located within the area S at the center of the work machine A relative to the left and right, so that rocking of the machine frame 11 in the front-to-back and left-to-right directions is suppressed, and the handle 21 located above the work machine A is prevented from swinging left and right during work, and the machine body A can be placed stably on the traveling surface.

[0085] The center of gravity Gt2 of the entire machine body A when the working unit 31 is in the lowered position and the object W is loaded on the working unit 31 will be described. When an object W such as soil or sand is removed with the working unit 31 in a lowered position and the object W is loaded onto the working unit 31, the center of gravity Gt2 is positioned slightly lower and further forward in the direction of travel than the center of gravity Gt1, as shown in Figures 1 and 12. In other words, the center of gravity Gt2 is positioned forward of the ground contact portion 72 and rearward of the rotation axis 13.

[0086] Even when the machine is loaded on the working unit 31, the center of gravity Gt2 is located rearward of the rotation shaft 13, so the front end of the machine casing 11 can be prevented from dropping downward. That is, even though the operator is pushing the gripping unit 22 forward, the first fulcrum portion 25 will not unexpectedly rise, so the operator will not encounter the inconvenience of having to operate the gripping unit 22 due to the position of the gripping unit 22 becoming unstable. 12, in a plan view, the center of gravity Gt2 is located in the left-right central portion of the work machine A. In a plan view, the center of gravity Gt2 is located within the area S in the left-right central portion of the work machine A, so that the handle 21, which is located above the work machine A, can be prevented from swinging left and right during work.

[0087] The stand 71, which is positioned rearward of the center of gravity Gt2, is placed on the ground, so that the center of gravity Gt2 is positioned rearward of the rotation shaft 13, and thus the machine frame 11 can be prevented from rolling backward.

[0088] The center of gravity Gt3, which is the center of gravity of the entire machine body A and is the position when the working unit 31 is in the ascending / descending position (midway up) and carrying the object W, will be described. When the working unit 31 is raised together with the object W that is the load and reaches the raised position, the center of gravity of the entire working machine A, including the load, gradually rises from the position of center of gravity Gt2 shown in Fig. 1 as the working unit 31 rises, and reaches the position of center of gravity Gt3 shown in Fig. 5. In this case, the center of gravity Gt3 is located higher than the center of gravity Gt2, but is approximately the same in the front-to-rear direction, and is located forward of the ground contact portion 72 and rearward of the rotation shaft 13, as shown in Fig. 5. This prevents the front end of the machine casing 11 from dropping downward.

[0089] Furthermore, by grounding the stand 71 located behind the center of gravity Gt3, it is possible to prevent the machine casing 11 from rolling backward, which would otherwise occur if the center of gravity Gt3 were located behind the rotation axis 13. Therefore, even if the operator is pushing the gripping part 22 downward while the working part 31 is rising, the first fulcrum part 25 will not rise unexpectedly, and stable rotation of the gripping part 22 can be achieved. In the plan view shown in Figure 12, etc., the center of gravity Gt3 is located in the center of the left and right of the work machine A within the area S, so that the work machine A can be prevented from swaying back and forth and side to side while the working part 31 is being raised, and even when it is raised.

[0090] The center of gravity Gt4 of the entire machine body A, which is the position when the working unit 31 is at the highest raised position and carrying the object W, will be described. By further raising the working unit 31 from the state shown in FIG. 5 , the bucket unit 33 is swung and tilted left and right, as shown in FIG. 6 , to assume a discharge posture in which the loaded object W is discharged from the left and right sides of the working unit 31. At this time, the center of gravity Gt4 of the entire working machine A immediately before discharging the object W is slightly higher and located slightly rearward in the front-to-rear direction compared to the center of gravity Gt3, as shown in FIG. 6 . By positioning the center of gravity Gt4 forward of the ground contact portion 72 and rearward of the center line l5 of the rotation shaft 13, as shown in FIG. 12 , the front end of the machine casing 11 can be prevented from sagging downward. Furthermore, even if the center of gravity Gt3 is located rearward of the center line l5 of the rotation shaft 13, the machine casing 11 can be prevented from tipping backward by the stand 71, which is located rearward of the center of gravity Gt3, touching the ground.

[0091] As shown in Fig. 12, in a plan view, the center of gravity Gt4 is located at a position slightly shifted in the width direction relative to the direction of travel from the left-right center of the work machine A. However, in a plan view, the center of gravity Gt4 is located within the area S shown in Fig. 12, which is surrounded by the ground contact portion 72 and the ground contact portion of the traveling portion 12. Therefore, rocking of the machine frame 11 in the front-rear and left-right directions can be suppressed, and the handle 21 having the gripping portion 22 that the operator grips in the unloading posture can be suppressed from swinging left and right, allowing the object W to be discharged stably.

[0092] Furthermore, since the center of gravity Gt4 is located behind the rotation axis 13 and in front of the ground contact portion 72, it is possible to discharge the object W while maintaining the machine casing 11 in a substantially horizontal state. Furthermore, since the first fulcrum portion 25, which is the fulcrum of the handle 21 grasped by the worker, does not swing significantly, the worker can grip the gripping portion 22 and perform the work with confidence.

[0093] The center of gravity Gt5 of the entire machine body A, which is the position when the working unit 31 is at its highest raised and lowered position and empty, will be described. In the object W discharging posture, when the loaded object W is discharged from the working unit 31, the position of the center of gravity (the position of the center of gravity of the working unit 31 in the unloading posture when empty) changes to the position of center of gravity Gt5 shown in Fig. 6. The center of gravity Gt5 is located rearward and slightly below the center of gravity Gt4 in a side view, and is located slightly shifted in the width direction relative to the traveling direction from the center of the work machine A in the left-right direction in the plan view shown in Fig. 12. Furthermore, the center of gravity Gt5 is located forward of the ground contact portion 72 and rearward of the center line 15 of the rotation shaft 13 as shown in Fig. 12. Furthermore, the center of gravity Gt5 in plan view, like the center of gravity Gt4, is located within the area S surrounded by the ground contact portion 72 and the ground contact portion of the traveling portion 12, so the machine casing 11 is stable, and the object W can be discharged stably even if the load amount of the working unit 31 in the discharge posture changes. Also, the handle 21 having the gripping portion 22 that the worker grips can be prevented from swinging left and right. [Explanation of symbols]

[0094] 11 machine frame 12 Running part 21 Handle 22 Gripping part 25 First Support 26 Second Support 31 Working section 33 Bucket section 34 Scraper 35 Loading section 37 Curved section 41 Link section 51 Connecting part 52 Dump Guide 61 Guide pin 71 Stand 72 Grounding part A Work equipment B Running surface l3 Imaginary line l4 Imaginary line o Instantaneous center W object

Claims

1. a handle that can be rotated about a first fulcrum provided on one end of the machine frame and has a grip at its end that can be held by an operator; a working unit that can rotate around a second supporting point located on the other end side of the machine frame; a running section provided on the machine frame and positioned between the first fulcrum section and the second fulcrum section, the running section being capable of running on a running surface; a stand having a grounding portion that is located between the gripping portion and the first fulcrum portion and that comes into contact with a running surface in a plan view; a bucket section provided in the working section, which is capable of loading an object and being lifted by operating a handle; Equipped with A work machine characterized in that one side of a bucket in the traveling direction comes into contact with a dump guide fixed to a machine frame, thereby preventing the one side of the bucket from rising.

2. the ground contact portion is located slightly above the running surface when the machine frame is in a horizontal position; 2. The work machine according to claim 1.

3. The ground contact width of the ground contact portion as viewed from the direction of travel is set to be the same as or slightly larger than the ground contact width of the running portion as viewed from the direction of travel.

3. The work machine according to claim 1 or 2.

4. the stand includes a third support portion provided on the machine frame and allowing the ground contact portion to rotate up and down between a ground contactable state and a stowed state; 4. The working machine according to claim 1, further comprising:

5. The stand includes a restricting member that allows the stand to be maintained in a groundable state; 5. The work machine according to claim 1, further comprising:

6. a connecting portion that connects the handle and the working portion and links the pivoting movement of the handle about the first fulcrum portion with the pivoting movement of the working portion about the second fulcrum portion; 6. The work machine according to claim 1, further comprising:

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