Work machine

Abstract

To provide a work machine having a mechanism for discharging an object loaded on a work portion to the side in a simple manner so that the working machine can be swung even by human power.SOLUTION: A work machine comprises: a work part 31 provided so as to be vertically rotatable relative to a machine frame 11; a guide plate 64 fixed to an end of the machine frame 11 to face each other; a bucket part 33 scooping up an object; a link part 41 making the bucket part 33 freely swing left and right in a travel direction; and a regulating pin 63 positioned between the guide plates 64 and regulating swing of the bucket part 33.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This invention relates to a working machine. Specifically, it relates to a working machine for scraping and collecting objects on a traveling road surface.

Background Art

[0002] In order to perform earth and sand discharging work in a narrow area, Patent Document 1 discloses a device that can easily discharge earth and sand to the side of the machine body without repeating the movement of the machine body. This device constitutes a boom with a front boom portion rotatably connected around an axial center in the front-rear direction at the tip of a rear boom, and is configured to drive and rotate the front boom portion around the front-rear axial center with an actuator.

[0003] For the same purpose, Patent Document 2 is disclosed. At the tip of a boom provided so as to be swingable up and down around a horizontal axial center, a bucket as a working part is dump-swingable around a front-rear axial center, and an actuator for causing this dump swing is supported by the boom via a link linkage mechanism. And, the lateral side wall portion of the bucket is provided so as to be foldable in conjunction with the dump swing of the bucket, and is switched to a posture for guiding the earth and sand to be discharged laterally and distantly.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the invention described in Patent Document 1, the front boom supports the bucket at the front and is connected to the rear boom by a pivot pin at the rear. Therefore, during operation, while a load is applied to the bucket, it is necessary to support this load with the pivot pin, which is the connection part with the rear boom, and it is necessary to ensure sufficient strength for the peripheral members including the pivot pin. In particular, since the lifting and lowering operation of the boom in Patent Document 1 is performed using an actuator, the increase in the weight of the boom due to ensuring strength does not reduce the function and performance to such an extent. However, when the lifting and lowering operation of the boom including the bucket is manually performed, even a small increase in weight can become a burden on the operator and cause a significant problem.

[0006] Further, in the invention described in Patent Document 1, it falls down with the pivot pin located at the middle part in the width direction of the bucket as the axis, so an object is discharged close to the side of the working machine. The objects stacked on the side of the working machine may collapse again towards the working machine side and hinder the progress of the working machine. As a technique to prevent this, Patent Document 2 presents a mechanism that can guide earth and sand laterally away by the lateral wall part of the bucket. However, similar to the problems pointed out in Patent Document 1, due to the mechanism that transmits the operation of the actuator through a link mechanism to operate the lateral wall part, a large weight increase is expected, which becomes a problem when manually performing the lifting and lowering operation of the boom including the bucket. The present invention has been made in view of the above problems, and an object thereof is to provide a working machine that simply configures a mechanism for discharging an object loaded on the working part to the side and enables it to swing even manually.

Means for Solving the Problems

[0007] This invention is a working part provided so as to be pivotable in the vertical direction with respect to the machine frame, guide plates fixed to the ends of the machine frame so as to face each other, the working part includes a bucket part for scooping up an object, a link part that enables the bucket part to swing left and right in the traveling direction, the bucket part is located between the guide plates and has a regulating pin that regulates the swinging of the bucket part, A working machine characterized by comprising relates to

[0008] This invention further The guide plate restricts the swing of the bucket part when the working part swings downward. A working machine characterized by relates to

[0009] This invention further The guide plate releases the restriction on the swing of the bucket part when the working part swings upward. A working machine characterized by relates to

Advantages of the Invention

[0010] This invention provides a working machine that simplifies the mechanism for discharging an object loaded on the working part to the side and enables manual swinging. In this invention, until the working part rises, the left - right swing and tilt of the bucket arranged on the working part can be restricted.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Mode for Carrying Out the Invention

[0012] The working machine A according to an embodiment of the present invention will be described with reference to the drawings. 11 is the machine frame. As shown in FIGS. 2 and 7, the machine frame 11 is formed in an annular shape in plan view. 12 is the traveling unit. The traveling unit 12 is disposed at the central portion of the machine frame 11. The working machine A can be moved on the traveling surface B by the traveling unit 12. In the embodiment of the present invention, it is of the type in which traveling wheels are arranged, but it can also travel in the type in which crawlers are arranged.

[0013] The traveling unit 12 is regardless of the presence or absence of power. When the traveling unit 12 has no power, by pushing the machine frame 11 in the front-rear direction, the traveling wheels or crawlers that are the traveling unit 12 roll on the traveling surface B, and the working machine A can move back and forth. When the traveling wheels that are the traveling unit 12 are rotationally driven by power, a motor is arranged at the central portion of the traveling wheels or at a location different from the traveling wheels, and the rotational power generated by this motor is transmitted to the traveling wheels to enable self-propelled movement. When the crawlers that are the traveling unit 12 are rotationally driven by power, a drive wheel that receives rotational power such as a motor and rotationally drives on either the front or rear side of the inner peripheral side of the crawlers, and a driven wheel are arranged on the other of the front and rear, whereby the crawlers that have received the driving force are circularly driven, and the working machine A can be made self-propelled.

[0014] 21 is the handle. The handle 21 is provided at one end side that is the rear side of the machine frame 11 and is gripped by the operator. The lower end of the handle 21 is connected to the machine frame 11, provided upward from the lower end, and the upper end portion is provided with a gripping portion 22 that is gripped by the operator.

[0015] When the operator grips the gripping portion 22 and pushes the machine frame 11 back and forth, the traveling unit 12 rolls on the traveling surface B, and the working machine A including the machine frame 11 can move back and forth. When configured in a self-propelled form, the gripping portion 22 may have an accelerator lever 23 for operating the on and off of the rotation of the drive source, and a shift lever 24 for adjusting the rotation direction and the degree of rotation speed of the drive source. The working machine A can self-propel only by operating the accelerator lever 23 and the shift lever 24.

[0016] 25 is the first fulcrum portion. The first fulcrum portion 25 is provided on the operator side which is one end side of the machine frame 11, and enables the handle 21 to pivot in the vertical direction about the left and right with respect to the traveling direction. The connection between the lower end of the handle 21 and the machine frame 11 is performed by the first fulcrum portion 25. By the first fulcrum portion 25, the upper end side of the handle 21 is provided so as to be swingable forward and backward or vertically.

[0017] 26 is the second fulcrum portion. The second fulcrum portion is provided at the front portion which is the other end of the machine frame 11. By the second fulcrum portion 26 (fulcrum portion) located on the other end side which is the front portion of the machine frame 11, the working portion 31 located in front of the working machine A is capable of vertical pivoting about the left and right with respect to the traveling direction. The working portion 31 is connected to the second fulcrum portion 26 and has a link portion that connects the arm portion 32 and the bucket portion 33.

[0018] 31 is the working portion. The working portion 31 is provided by being located on the other end side which is the front side of the machine frame 11. The working portion 31 has, in order of connection from the second fulcrum portion 26, an arm portion 32, a link portion 41, and a bucket portion 33. The arm portion 32 has an L shape in side view. The arm portion 32 is pivotable in the vertical direction around the second fulcrum portion 26.

[0019] A first link connection portion 44 is provided at the front end portion which is one end side of the arm portion 32. The arm portion 3 A second link connection portion 45 is provided at the rear portion of the bucket portion 33 located in front of the arm portion 32. The working portion 31 is composed of the arm portion 32 and the bucket portion 33 disposed at the front end portion which is one end side of the arm portion 32. As shown in FIG. 1, the bucket portion 33 can push the object W or scoop up the object W. Further, the arm portion 32 and the bucket portion 33 are connected by a link portion 41 described later.

[0020] 51 is a connecting part. In the embodiment of this invention, the connecting part 51 is composed of a rod member. The connecting part 51 connects the arm part 32 and the handle 21, connects the other end side located near the second fulcrum part 26 of the arm part 32 and the middle part of the handle 21, and connects the handle 21 and the working part 31. By connecting the arm part 32 and the handle 21 with the connecting part 51, the arm part 32 that swings up and down around the second fulcrum part 26 and the handle 21 that swings around the first fulcrum part 25 are interlocked. The connecting part 51 interlocks the swinging motion of the handle 21 around the first fulcrum part 25 with the swinging motion of the working part 31 around the second fulcrum part 26. The swinging of the handle 21 and the working part 31 is interlocked by the connecting part 51. In the embodiment, the swinging directions in which the handle 21 and the working part 31 are interlocked are made the same direction. That is, when the upper end part of the handle 21 is tilted downward to the rear side, the working part 31 rises, and when the upper end part of the handle 21 is lifted upward to the front side, the working part 31 descends.

[0021] 52 is a dump guide. The dump guide 52 is composed of a rod-shaped member. The dump guide 52 is fixed to the front end part of the machine frame 11 horizontally left and right in the advancing direction. The dump guide 52 is positioned near the second fulcrum part 26 and is positioned above the guide pin 61 when the working part 31 is in the grounded state. The guide pin 61 is provided on the upper part of the bucket part 33 and is a member that protrudes rearward. 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 from the rear end side of the guide pin 61. In the case of the embodiment of this invention, as shown in FIGS. 2, 3, 6 to 10, it protrudes to the right side in the advancing direction.

[0022] 41 is a link part. 44 is a first link connecting part. 45 is a second link connecting part. The link portion 41 is composed of two link pieces, namely, the first link 42 and the second link 43. In the embodiment, the first link 42 is arranged on the right side in the advancing direction, and the second link 43 is arranged on the left side in the advancing direction. By providing the link portion 41 between the arm portion 32 and the bucket portion 33, the bucket portion 33 can be freely swung and tilted in the left-right direction with respect to the advancing direction with respect to the arm portion 32. Both ends of the first link 42 are attached to the working portion 31.

[0023] The first link connecting portion 44 is provided at the front end of the arm portion 32. As shown in FIGS. 8 to 10 and the like, the first link connecting portion 44 arranges the first link 42 and the second link 43 side by side in the left-right direction in the advancing direction, and swingably connects the upper portions of each of them to the first link connecting portion 44 in the left-right direction. The second link connecting portion 45 is provided at the rear portion of the bucket portion located in front of the arm portion 32 and below the first link connecting portion 44. As shown in FIGS. 8 to 10 and the like, the second link connecting portion 45 connects the lower portions of the first link 42 and the second link 43 that are swingable left and right with respect to the first link connecting portion 44. The link portion 41 is connected to the first link connecting portion 44 spanned over the front ends of the pair of left and right arm portions 32.

[0024] The arm portion 32 rotates in the vertical direction with the second fulcrum portion 26 as a fulcrum. The upper end portion of the first link 42 is connected to the first link connecting portion 44, and the first link 42 hangs down from the first link connecting portion 44. Similarly, for the second link 43, the upper end portion 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 end portions of the first link 42 and the second link 43 are swingably connected to the second link connecting portion 45 located at the lower rear of the bucket portion 33 in the left-right direction in the advancing direction. The bucket portion 33 is in a suspended state with the lower portion of the bucket portion 33 by the link portion 41, and the bucket portion 33 is configured to be swingable and tiltable in the left-right direction with respect to the advancing direction with respect to the arm portion 32. The bucket part 33 is supported by the link part 41 so as to be swingable in the left - right direction with respect to the advancing direction with respect to the arm part 32.

[0025] The link part 41 connects the arm part 32 and the bucket part 33, enables the bucket part 33 to swing freely in the left - right direction in the advancing direction, and can incline the bucket part 33 with respect to the advancing direction as shown in FIGS. 9 to 10. The first link 42 and the second link are arranged to incline so as to approach each other from above to below as shown in FIG. 8. The link part 41 connects the upper end parts of the first link 42 and the second link 43, which are two links, to the first link connection part 44 located at the tip of the arm part 32 with the front - rear axis as a fulcrum, and the lower end side is provided to be rotatable in the left - right direction. The lower end parts of the first link 42 and the second link 43 are connected to the second link connection part 45 located at the lower end part of the rear part of the bucket part 33 with the front - rear axis parallel to the upper end side as a fulcrum. The bucket part 33 is connected to the arm part 32 in a state of hanging the lower end side of the bucket part 33 from the tip of the arm part 32.

[0026] The link part 41 forms a four - bar link to connect the arm part 32 and the bucket part 33. When comparing the distance between the upper end parts of the link pieces on the arm part 32 side and the distance between the lower end parts of the link pieces on the bucket part 33 side, the former distance is set larger. With this configuration of the link part 41, the bucket part 33 can swing freely in the left - right direction in the advancing direction, and as the bucket part 33 swings to either the left or right side, the degree of inclination of the left and right end parts of the bucket part 33 in the vertical direction with respect to the advancing direction can be increased. In the embodiment, as the bucket part 33 is swung to the right side in the advancing direction, the bucket part is configured to incline greatly so that the right end of the bucket part 33 drops below the left end.

[0027] 63 is a regulating pin. The regulating pin 63 is a rod - shaped member, is positioned from the upper - center of the bucket part 33 toward the rear, and is fixed integrally with the bucket part 33. The bucket part 33 is provided with a regulating pin 63 from the bucket part 33 toward the guide plate 64 in a state where the working part 31 is swung downward. The regulating pin 63 restricts the swinging of the bucket part 33 to the left and right in the traveling direction by being positioned between the guide plates 64, and releases it from the restriction by the guide plate 64 in a state where the working part 31 is swung upward.

[0028] 64 is a guide plate. The guide plate 64 is composed of two plates, fixed to the end of the machine frame 11, and provided facing each other. A pair of guide plates 64 are provided facing each other so as to sandwich the regulating pin 63 from both the left and right sides in the traveling direction. The guide plate 64 in the embodiment of this invention has a round bar, which is a guide member 65 for the regulating pin 63, along the front end as shown in FIGS. 6, 8 to 10. By positioning the regulating pin 63 between the pair of guide plates 64, it is possible to prevent the left and right swinging and the up and down tilting of the left and right ends of the bucket part 33. The prevention of this swinging and tilting is released when the regulating pin 63 moves above the guide plate 64 and no longer positions between the pair of guide plates 64 as the bucket part 33 rises.

[0029] As shown in FIGS. 1 and below, the bucket part 33 is provided at the end of the arm part 32 of the working part 31. The bucket part 33 can push the object W or scoop up the object W. In a side view of the bucket part 33, as shown in FIGS. 4 and 11, it has a shape having a curved surface with a concave central front surface with respect to the upper and lower sides of a plate-like member. The left and right side surfaces of the bucket part 33 with respect to the traveling direction are open. The bucket part 33 projects the regulating pin 63 rearward in the vicinity of the guide pin 61. The regulating pin 63 is integrally fixed to the bucket part 33.

[0030] 34 is a scraper. The scraper 34 is provided at the lower end of the tip of the bucket portion 33 which is the front end portion of the working portion 31 as shown in FIG. 1 and below. A moving surface on which the object W can move is provided on the surface of the scraper 34. The moving surface is provided so as to be rotatable from a position directed obliquely upward forward to a position directed obliquely upward backward by the second fulcrum portion 26. The scraper 34 can be grounded on the traveling surface B when the working portion 31 is lowered, and can be positioned between the traveling surface B on which the front end of the scraper 34 travels and the object W existing on the traveling surface B.

[0031] 61 is a guide pin. The guide pin 61 is fixedly provided on the upper portion of the bucket portion 33 of the working portion 31 as shown in FIGS. 8 to 10 and others. Further, the guide pin 61 in the embodiment protrudes rearward from the upper portion of the bucket portion 33, and a pair of bifurcated guide pins 61 are provided symmetrically with respect to the left and right in the traveling direction. When the working portion 31 is raised, the guide pin 61 relatively rises with respect to the dump guide 52, and eventually one of the guide pins 61 contacts the dump guide 52. At this time, the regulating pin 63 positioned between the guide plates 64 until midway through the raising of the working portion 31 will be positioned above the guide plates 64, and the state of preventing the left and right swing and the vertical tilting of the left and right ends of the bucket portion 33 will be released. As shown in FIGS. 4 and 8, the guide pin 61 fixed to the working portion 31 rises as the working portion 31 rises, and when it reaches a certain rising position, it contacts the dump guide 52 fixed to the machine frame 11. When the working portion 31 is further raised after the contact between the guide pin 61 and the dump guide 52, due to the continuation of the contact between the guide pin 61 and the dump guide 52, as shown in FIGS. 5, 6, 7, 9, and 10, the bucket portion 33 on the side where the dump guide 52 contacts is prevented from rising. In the embodiment of this invention, the bucket portion 33 of the working portion 31 on the right side in the traveling direction is prevented from rising.

[0032] On the side where the guide pin 61 and the dump guide 52 do not come into contact, as shown in FIGS. 5, 6, 7, 9, and 10, the bucket portion 33 on the left side in the traveling direction is not prevented from rising. Therefore, when the working portion 31 is raised with the guide pin 61 and the dump guide 52 in contact, as shown in FIGS. 5, 6, 7, 9, and 10, the bucket portion 33 supported by the link portion 41 has the right end portion on the traveling direction side, which is the side where the guide pin 61 and the dump guide 52 come into contact, inclined downward, and starts to swing to the right side in the traveling direction on the side where the guide pin 61 and the dump guide 52 come into contact. During the raising and lowering of the working portion 31 with the guide pin 61 and the dump guide 52 in contact, the guide pin 61 and the dump guide 52 continue to be in contact while the guide pin 61 moves in the left-right width direction with respect to the traveling direction with respect to the dump guide 52.

[0033] Reference numeral 62 shown in FIGS. 8 to 10 is a bracket. The bracket 62 is formed on the upper portion of the bucket so as to cover the rear from above the first link connection portion 44 in a side view, and protects the first link connection portion 44 and the upper portion of the link portion 41. A guide pin 61 and a regulating pin 63 are provided on the bracket 62 formed on the upper portion of the bucket portion 33. The guide pin 61 is formed of a rod-shaped member, and the rear end side thereof protrudes rearward and slightly to the left and right sides. In the case of the embodiment of the present invention, the guide pin 61 protrudes in a bifurcated shape to the rear and slightly to the left side and to the rear and slightly to the right side. Since the guide pin 61 is integrally fixed to the bucket portion 33, it moves up and down as the working portion 31 moves up and down. The guide pin 61 is provided on the bucket portion 33, and when the working portion 31 pivots upward, the dump The bucket portion 33 is forcibly inclined by coming into contact with the guide 52.

[0034] The positional relationship between the guide pin 61 and the dump guide 52 will be described. In FIGS. 1 and 11, l1 is the distance from the second fulcrum portion 26 to the tip of the guide pin 61. In FIGS. 1 and 11, l2 is the distance from the second fulcrum portion 26 to the dump guide 52. When the second fulcrum portion 26 is used as a reference in a side view, as shown in FIG. 1 and the following figures, the distance l2 from the second fulcrum portion 26 to the dump guide 52 is provided to be longer than the distance l1 from the second fulcrum portion 26 to the rear end of the guide pin 61. That is, the turning radius of the rear end portion of the guide pin 61 integrated with the working portion 31 that turns up and down with the second fulcrum portion 26 as a fulcrum is located closer to the second fulcrum portion 26 side than the dump guide 52. This means that when the working portion 31 turns up and down with the second fulcrum portion 26 as a fulcrum, the rear end portion of the guide pin 61 will eventually come into contact with the dump guide 52.

[0035] By raising the working portion 31, the guide pin 61 can contact the dump guide 52 as shown in FIGS. 9 and 10, and by further raising the working portion 31, the bucket portion can be tilted to the right side in the traveling direction. After the bucket portion 33 swings or tilts, even if the raising of the working portion 31 is stopped midway, the dump guide 52 is located above the guide pin 61 and restricts the raising of the guide pin 61, so that the bucket portion 33 can be prevented from returning to its original position.

[0036] O shown in FIG. 8 is the instantaneous center. The instantaneous center o is the rotation center that forms the inclination of the bucket portion 33 which is the working portion 31. When the bucket portion 33 swings by the first link 42 and the second link 43, the bucket portion 33 rotates about the instantaneous center o which is the virtual center formed by the first link 42 and the second link 43. In FIG. 8, it is the moment when the guide pin 61 contacts the dump guide 52, and the tilting operation of the bucket portion 33 around the instantaneous center o has not started.

[0037] As shown in FIG. 8, the instantaneous center o is the intersection point of the virtual straight line connecting the first link connecting portion 44 and the second link connecting portion 45 with the first link 42 and the second link 43. The instantaneous center which is the rotation center of the inclination of the bucket portion 33 changes its relative position with the bucket portion 33 according to the inclination position and the swinging position of the bucket portion 33. When the working unit 31 is raised, the bucket unit 33 starts to swing or tilt when the guide pin 61 comes into contact with the dump guide 52. After that, the link mechanism formed by the first link 42 and the second link 43 generates the swing or tilt movement. The inclination of the bucket unit 33 is generated by the first link 42. The center of rotation, which is a virtual point formed by the first link 42 and the second link 43, is the instantaneous center o. 8 is located below the left-right center of the bucket unit 33 with respect to the traveling direction. Then, when the working unit 31 is further raised, the instant center o moves to the right and upward in the relative traveling direction relative to the bucket unit 33, approaching the second link connection part, as shown in Fig. 9. While the working unit 31 is being raised, the bucket unit 33 swings laterally by the first link 42 and the second link 43, and tilts around the moving instant center o as an axis. As shown in Fig. 9, the instant center o located on the side of the bucket unit 33 allows the bucket unit 33 to tilt significantly in the left and right directions.

[0038] By further raising the working unit 31 from the state shown in FIG. 8, 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. 9, the second link connection part 45 is further raised with respect to the first link connection part 44 as shown in FIG. 10, as compared with the state shown in FIG. 8 and FIG. 9, and the bucket unit 33 swings laterally. Also, the bucket unit performs a tilting motion with the moving instantaneous center o as an axis. The instantaneous center o in FIG. 10 moves slightly to the right of the relative center of the bucket unit 33 and to the upper part of the second link connection part 45, as compared with FIG. 9. As shown in FIG. 10, the instantaneous center o located slightly in the center of the bucket unit 33 allows the bucket unit 33 at the rearmost part of the rise to perform a motion as if it were flipping over on the spot. This allows the bucket unit 33 to exert an action on the object W as if it were shaking the object W off the bucket unit 33.

[0039] In the case of the embodiment, when the working unit 31 is raised to reach the uppermost position, as shown in FIG. 10, the longitudinal direction of the first link 42 rotates until it reaches a position relatively lower than the bottom surface portion of the second link connecting portion 45. However, the inclination angle of the bucket portion 33 when it swings by the link portion 41 may be increased so that the object W can slide down, and the first link 42 does not necessarily rotate in the reverse direction with respect to the second link connecting portion 45.

[0040] By providing the lower distance to be smaller than the upper distance, which is the relative distance between the first link 42 and the second link 43 in the working state, when the working unit 31 is raised, from the state shown in FIG. 8, through the state shown in FIG. 9, as shown in FIG. 10, the link portion 41 is formed so as to bend in the reverse direction or bend until it approaches the reverse direction. By configuring in this way, as the bucket portion 33 is positioned at the end that swings in the left - right direction, the inclination angle of the bucket portion 33 can be increased, and the object W on the bucket portion 33 can be efficiently discharged to the side of the machine body.

[0041] Due to the configuration of the link portion 41, as the bucket portion 33 is positioned at the swing end, the swing speed of the bucket portion 33 can be increased. The object W on the bucket portion 33 that swings laterally and is positioned at the swing end portion can be discharged so as to be shaken off forcefully to the side of the machine body as shown in FIGS. 5 and 6.

[0042] The actions of the guide pin 61 and the damper guide 52 will be described. By grounding the front end side of the bucket part 33 on the traveling surface B and moving forward, as shown in FIG. 1, an object W such as earth and sand is scraped and collected into the bucket part 33. After that, when the arm part 32 is pivoted upward about the second fulcrum part 26, the link part 41 and the bucket part 33 also rise and pivot simultaneously. Since the movement of the bucket part 33 in the left - right direction with respect to the traveling direction is restricted by the guide plate 64 by the regulating pin 63, the bucket part 33 does not swing or tilt left - right in the traveling direction with respect to the arm part 32. Therefore, the tip of the scraper 34 of the bucket part 33 rises parallel to the traveling surface B with respect to the traveling surface B or the machine frame 11.

[0043] If the upward pivoting of the arm part 32 is continued further, the rear end part of the guide pin 61 fixed to the blade part comes into contact with the dump guide 52. In the embodiment of this invention, on one hand, the right - hand guide pin 61 and the right side of the dump guide 52 come into contact. If the arm part 32 is further pivoted upward, in a side view, the regulating pin 63 appears from the upper end of the guide plate 64, and the state of preventing the left - right swing and tilting of the bucket part 33 by the guide plate 64 and the regulating pin 63 is released.

[0044] If the arm part 32 is further pivoted upward, as shown sequentially in FIGS. 9 and 10, since the guide pin 61 is engaged by the dump guide 52, the upward movement of the rear end part of the guide pin 61 is restricted. Also, the bucket part 33 to which the guide pin 61 is fixed is enabled to swing left - right and tilt up - down by the link part 41. Therefore, by the dump guide 52 forcibly pressing the rear end part of the guide pin 61, the bucket part 33 supported by the link part 41 starts to swing left - right and the left and right ends start to swing up - down. In the embodiment of this invention shown in the figures, the bucket part 33 is offset to the right side in the traveling direction with respect to the machine frame 11, and is inclined such that the right - hand end part is lower than the left - hand end part of the bucket part 33.

[0045] Therefore, the scraped object W on the bucket part 33 slides down according to the inclination of the inclined bucket part 33 as shown in FIGS. 5, 6, and 7. Also, since either the left or right end of the bucket part 33 on the side where the object W slides down is offset to either the left or right side in the traveling direction, it can be discharged to a position that does not block the traveling direction of the aircraft 11. In the illustrated example, the bucket part 33 is offset to the right side in the traveling direction and is provided such that the right end of the bucket part 33 descends downward. However, by providing the protruding direction of the dump guide 52 on the opposite side, the left side, and bringing the other left guide pin 61 into contact with the dump guide 52, it can be offset to the left side opposite to the illustration, and the left end can be inclined downward. After the discharge of the object W is completed, when the arm part 32 is lowered, it can be lowered while returning the swing and tilt of the bucket part 33 to their original positions following the reverse process of the above-described ascending procedure of the working part.

[0046] In the embodiment of the present invention, by simply operating the operator to push down the gripping part 22, the object W loaded on the bucket part 33 can be lifted and the object W can be discharged to a far position on the side.

[0047] In the description of the embodiment according to the present invention, the object W was loaded onto the working part 31 and discharged from the working part 31 by the operation of the operator. However, the present invention can be implemented even without the handle 21 operated by the operator. By directly connecting a drive source such as a cylinder or a motor to the arm part 32 or to a connecting part 51 or a handle 21 connected thereto and simply moving the arm part 32 up and down, the left and right swing and the up and down tilt of the bucket part 33 can be achieved. That is, by at least assisting the up and down movement of the bucket part 33 with a drive source, a mechanism related to the discharge of the object W can be configured, and thus the configuration of the working machine A can be made simple.

[0048] The operations of the scraper 34 and the bucket part 33 will be described. As shown in FIG. 1, when the scraper 34 moves forward, the object W is peeled off from the traveling surface B, and the object W peeled off from the traveling surface B that is moving relatively forward is pushed out onto the upper surface of the scraper 34 by the object W in front of it. In this way, the object W such as earth and sand is moved to the upper surface of the bucket portion 33, and the object W can be scooped up.

[0049] The distance between the intermediate portion of the handle 21 where the first fulcrum portion 25 and the connecting portion 51 are connected and the second fulcrum portion 26 and the other end side of the arm portion 32 is provided such that the former is larger. Thereby, when the handle 21 swings, the turning angle of the working portion 31 can be increased with respect to the turning angle of the handle 21. That is, when the operator grips the gripping portion 22 and pushes down the handle 21 by a short distance, the working portion 31 can turn and rise greatly. In the case of the embodiment of this invention, when the operator pushes down the gripping portion 22 at the upper end of the handle 21, the working portion 31 turns upward. The working portion 31 that has turned upward can be positioned above the traveling surface B.

[0050] An operation using the working machine A which is an embodiment to which this invention is applied will be described. When the operator grips the gripping portion 22 of the handle 21 and lifts the handle 21, the working portion 31 descends. When the tip of the scraper 34 contacts the traveling surface B, the descent of the working portion 31 stops, and the rotation of the handle 21 upward and forward is also restricted.

[0051] When the operator grips the gripping portion 22 and moves forward, the working machine A moves forward. Since the rotation of the handle 21 forward is also restricted by the contact between the scraper 34 and the traveling surface B, as long as the operator grips the gripping portion 22 and moves the working machine A forward, it moves forward while maintaining the contact state between the scraper 34 and the traveling surface B.

[0052] When the scraper 34 moves forward in contact with the traveling surface B, as shown in FIG. 1, the tip of the scraper 34 enters between the traveling surface B and the object W located above it, and the object W can be peeled off from the traveling surface B. Further, when the forward movement of the working machine A is continued, the object W is pushed by the object W moving relatively from the front and moves onto the upper surface of the scraper 34. Continuing further, the object W moves onto the curved surface of the bucket portion 33 and is placed thereon.

[0053] After an arbitrary amount is placed on the curved surface of the bucket portion 33, the operator stops the forward movement and presses down the gripping portion 22, then the working portion 31 pivots upward with the second fulcrum portion 26 as a fulcrum. Since the working portion 31 pivots upward with a larger pivoting angle amount with respect to the pivoting angle amount around the first fulcrum portion 25 of the handle 21, the operator can scoop up the object W above the traveling surface B without operating the gripping portion 22 greatly.

[0054] Japanese Patent Application No. 2021-192740, 21PA017 "Working Machine", at the time of filing [Claim 1] A working portion provided so as to be pivotable in the vertical direction around a fulcrum portion located at an end of the machine frame, The working portion includes an arm portion that is pivotable in the vertical direction around the fulcrum portion, A bucket portion located at an end of the arm portion for scooping up an object, A link portion that connects the arm portion and the bucket portion, allows the bucket portion to swing freely left and right in the traveling direction, and inclines the bucket portion with respect to the traveling direction, A working machine characterized by comprising the above.

[0055] Japanese Patent Application No. 2021-192740, 21PA017 "Working Machine", at the time of filing [Claim 2] The link portion is composed of a first link and a second link, and the first link and the second link are arranged to be inclined with respect to each other. The working machine according to claim 1, characterized by the above.

[0056] Japanese Patent Application No. 2021-192740, 21PA017 "Working Machine", at the time of filing [Claim 3] A dump guide that is fixed to the end of the machine frame, is located near the fulcrum portion, and protrudes to either the left or right side; A guide pin that is provided on the bucket portion and that forcibly inclines the bucket portion by contacting the dump guide when the working portion pivots upward; The working machine according to claim 1 or 2, characterized by comprising the above.

[0057] Japanese Patent Application No. 2021-192740, 21PA017 "Working Machine", filing date [Claim 4] Guide plates that are fixed to the end of the machine frame and are provided facing each other; The bucket portion is provided from the bucket portion toward the guide plates in a state where the working portion pivots downward, and restricts swaying in the left-right direction of the traveling direction of the bucket portion by being positioned between the guide plates, and a restricting pin that is released from the restriction by the guide plates in a state where the working portion pivots upward; The working machine according to any one of claims 1 to 3, characterized by comprising the above.

[0058] Japanese Patent Application No. 2021-192740, 21PA017 "Working Machine", filing date [Claim 5] The bucket portion can push an object or scoop up an object; The guide pin rises as the working portion rises and contacts the dump guide. Further, when the working portion is raised further, due to the contact between the guide pin and the dump guide, the bucket portion on the side of the working portion where the dump guide contacts is blocked from rising, and the bucket portion on the side where the guide pin and the dump guide do not contact is not blocked from rising. The working machine according to claim 3 or 4, characterized by the above.

[0059] Japanese Patent Application No. 2021-192740, 21PA017 "Working Machine", filing date [Claim 6] When the working part is raised with the guide pin and the dump guide in contact, the bucket part tilts toward the side where the guide pin and the dump guide are in contact and swings toward the side where the guide pin and the dump guide are in contact. The working machine according to any one of claims 3 to 5, characterized in that.

[0060] (Appendix 1) The bucket part can push an object or scoop up an object. The guide pin rises as the working part rises and contacts the dump guide. When the working part is further raised, due to the guide pin and the contact between the guide pin and the dump guide, the bucket part on the working part side where the dump guide is in contact is prevented from rising, and the bucket part on the side where the guide pin and the dump guide are not in contact is not said to be prevented from rising. Therefore, when the working part is raised with the guide pin and the dump guide in contact, the bucket part supported by the link part tilts toward the side where the guide pin and the dump guide are in contact in the traveling direction and swings toward the side where the guide pin and the dump guide are in contact. The working machine according to any one of claims 1 to 4, characterized in that.

[0061] (Appendix 2) A working part provided so as to be pivotable in the vertical direction around a fulcrum part located at an end of the machine frame, The working part includes an arm part that is pivotable in the vertical direction around the fulcrum part, A bucket part located at the end of the arm part for scooping up an object, A link part that connects the arm part and the bucket part, enables the bucket part to swing freely left and right in the traveling direction, and inclines the bucket part with respect to the traveling direction. A dump guide that is fixed to the end of the machine frame, is located near the fulcrum part, and protrudes to either the left or right side. A guide pin provided on the bucket part, which contacts the dump guide when the working part rotates upward, thereby forcibly tilting the bucket part. As the working part ascends, the guide pin ascends and contacts the dump guide. When the working part is further ascended, due to the contact between the guide pin and the dump guide, the bucket part on the side where the dump guide contacts is blocked from ascending, while the bucket part on the side where the guide pin and the dump guide do not contact is not blocked from ascending. A working machine characterized by the above.

[0062] (Appendix 3) When the working part is ascended with the guide pin and the dump guide in contact, the bucket part inclines toward the side where the guide pin and the dump guide contact in the traveling direction and swings toward the side where the guide pin and the dump guide contact. The working machine according to claim 5, characterized by the above.

Explanation of reference numerals

[0063] 11 Machine frame 21 Handle 25 First fulcrum part 26 Second fulcrum part 31 Working part 32 Arm part 33 Bucket part 34 Scraper 26 Second fulcrum part 41 Link part 42 First link 43 Second link 51 Connecting part 52 Dump guide 61 Guide pin 63 Regulation pin A Working machine W Object

Claims

**Claim 1** An operating unit provided so as to be rotatable in the vertical direction with respect to the machine frame, Guide plates fixed to opposite ends of the machine frame, The operating unit includes a bucket unit for lifting an object, A link unit that allows the bucket unit to swing left and right in the traveling direction, The bucket unit is located between the guide plates and has a regulating pin for regulating the swinging of the bucket unit, An operating machine, characterized by comprising the above. **Claim 2** The guide plate regulates the swinging of the bucket unit in a state where the operating unit is rotated downward, The operating machine according to claim 1, characterized by the above. **Claim 3** The guide plate releases the regulation of the swinging of the bucket unit in a state where the operating unit is rotated upward, The operating machine according to claim 1 or 2, characterized by the above.

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