JP2018031128A - Backhoe device and truck backhoe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a backhoe device and a truck backhoe which can avoid malfunction of an operation lever with a simple configuration.SOLUTION: A backhoe device includes: a first stopper 70 which can regulate oscillation of an oscillation lever 51 by being abutted to the oscillation lever 51 when a lock mechanism 50 is in a locking state or in a lock canceling state; and a second stopper 71 which is located in a position farther away from an oscillation axis P of the oscillation lever 51 than the first stopper 70 at a place below the first stopper 70, and can regulate oscillation of the oscillation lever 51 by being abutted to the oscillation lever 51 when the lock mechanism 50 shifts between the locking state and the lock canceling state.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a backhoe device provided with a backhoe working section, and a tractor backhoe provided with such a backhoe device.

  The above-described backhoe device is described in Patent Document 1, for example. In the backhoe device described in Patent Literature 1, a connecting part that is detachably connected to the rear part of the vehicle body of the riding tractor, a backhoe working part supported by the connecting part, an operation lever that can operate the backhoe working part, Is provided.

Japanese Patent Laying-Open No. 2011-230893 (FIG. 10)

  In the above-described backhoe device, the operation lever is provided so as to extend long upward. For example, when the backhoe device is connected to or disconnected from the tractor, and when traveling, the operator's body moves the operation lever. The control lever is easy to move regardless of the driver's intention when touching. Such an erroneous operation of the control lever is preferably avoided since it may cause a malfunction of the backhoe working unit.

  In view of the above circumstances, it has been desired to provide a backhoe device that can realize a malfunction of the operation lever with a simple configuration.

The backhoe device of the present invention is
A connecting part detachably connected to the rear part of the vehicle body of the riding tractor;
A backhoe working part supported by the connecting part;
An operation lever capable of operating the backhoe working unit;
A lock mechanism that can be switched between a lock state in which the operation lever is fixed at a neutral position and a lock release state in which the operation lever is neutrally fixed; and
A swing lever capable of switching the locking mechanism between the locked state and the unlocked state;
A first stopper portion capable of restricting the swing of the swing lever by contacting the swing lever when the lock mechanism is in the locked state or the unlocked state;
The lock mechanism is located below the first stopper portion at a position farther from the swing axis of the swing lever than the first stopper portion, and the lock mechanism transitions between the locked state and the unlocked state. And a second stopper portion capable of regulating the swing of the swing lever by contacting the swing lever.

According to the present invention, the swing lever that switches between the locked state and the unlocked state of the lock mechanism does not swing too much using the simple two-stage stopper portion of the first stopper portion and the second stopper portion. Can be regulated as follows. For this reason, it is possible to prevent the lock mechanism from being erroneously unlocked due to an erroneous operation of the swing lever, and an erroneous operation of the operation lever for operating the backhoe working unit can be avoided.
Therefore, according to the present invention, avoiding malfunction of the operation lever can be realized with a simple configuration.

In the present invention,
It is preferable that a step portion positioned between the first stopper portion and the second stopper portion is provided.

  According to this configuration, when the swing lever and the second stopper portion are worn due to repeated contact, the stepped portion swings instead of the second stopper portion (or in combination with the second stopper portion). It is possible to function as a stopper portion that can regulate the swing of the lever.

In the present invention,
It is preferable that the stepped portion has a non-linear shape when viewed in the direction of the rotational axis perpendicular to the pivot axis of the pivot lever.

  According to this configuration, when the step portion functions as a stopper portion of the swing lever, for example, a plurality of portions of the step portion having a non-linear shape come into contact with the swing lever. Can stabilize the posture.

In the present invention,
It is preferable that the stepped portion has a downward opening shape in which both end portions are positioned below the center portion when viewed in the direction of the rotation axis perpendicular to the swing axis of the swing lever.

  According to this configuration, when the step portion functions as the stopper portion of the swing lever, for example, at least two points of the step portion having a downward opening shape come into contact with the swing lever. The posture of the moving lever can be stabilized.

In the present invention,
It is preferable that the stepped portion has an upwardly convex arc shape when viewed in the direction of the rotational axis perpendicular to the pivot axis of the pivot lever.

  According to this configuration, the stepped portion can be formed into a smooth shape when obtaining the downwardly opening shape of the stepped portion. Thereby, for example, it is avoided that stress is continuously concentrated at a specific location when the swing lever comes into contact with the stepped portion, which is advantageous in terms of durability.

In the present invention,
It is preferable that the lower end portion of the second stopper portion has a non-linear shape in a rotation axis direction orthogonal to the swing axis of the swing lever.

  According to this configuration, when the lower end portion of the second stopper portion functions as the stopper portion of the swing lever, for example, a plurality of portions of the lower end portion that is non-linear among the second stopper portions are the swing lever. Therefore, the posture of the swing lever can be stabilized.

In the present invention,
A lever guide capable of guiding the swing lever;
In the lever guide,
A lock guide groove in which the rocking lever comes into contact with the first stopper and the lock mechanism is in the locked state;
A release guide groove in which the rocking lever comes into contact with the first stopper portion and the lock mechanism is in the unlocked state;
The lock guide groove and the release guide groove are connected, and the swing lever is moved around the rotation axis orthogonal to the swing axis while the swing of the swing lever is restricted by the second stopper portion. It is preferable that a switching guide groove capable of swinging is provided.

  According to this configuration, the swing of the swing lever is restricted by the first stopper in the lock guide groove and the release guide groove, and the swing of the swing lever is restricted by the second stopper in the switching guide groove. This prevents the swing lever from colliding with the lever guide when the swing lever is operated.

  The tractor backhoe of the present invention is provided with the backhoe device.

  According to the present invention, it is possible to configure a tractor backhoe that takes advantage of the backhoe device.

It is a right view which shows the whole tractor backhoe. It is sectional drawing of the right side view which shows the support structure of an operation lever, the lock mechanism of a locked state, etc. It is sectional drawing of the right side view which shows the support structure of an operation lever, the lock mechanism of a lock release state, etc. It is sectional drawing of the upper surface view which shows the support structure of an operation lever. It is sectional drawing of the rear view which shows a locking mechanism, a rocking lever, a 1st stopper part, a 2nd stopper part, a step part, etc. It is a top view which shows a rotation operation shaft. It is a top view which shows a lever guide and a rocking lever. It is sectional drawing of the right side view which shows a rocking | fluctuation lever, a 1st stopper part, a 2nd stopper part, a step part, etc. It is explanatory drawing of the right side view which shows entering into the engagement hole of a round shaft part. It is sectional drawing of the rear view which shows 1st another embodiment and shows a rocking lever, a 1st stopper part, a 2nd stopper part, a step part, etc. It is sectional drawing of the right side view which shows 1st another embodiment and shows a rocking | fluctuation lever, a 1st stopper part, a 2nd stopper part, a step part, etc. FIG. It is sectional drawing of the right side view which shows 2nd another embodiment and shows a rocking | fluctuation lever, a 1st stopper part, a 2nd stopper part, a step part, etc. FIG. It is sectional drawing of the right side view which shows 3rd another embodiment and shows a rocking | fluctuation lever, a 1st stopper part, a 2nd stopper part, a step part, etc.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In describing the embodiment, the F direction shown in FIG. 1 is defined as the front side of the vehicle body, the R direction is defined as the rear side of the vehicle body, the front side of the paper is defined as the right side of the vehicle, and the back side of the paper is defined as the left side of the vehicle.

  FIG. 1 is a right side view showing the entire tractor backhoe. As shown in FIG. 1, the tractor backhoe includes a backhoe device 10. The tractor backhoe is equipped with a pair of left and right front wheels 2 that can be driven and steered at the front of the body frame 1, and a pair of left and right rear wheels 3 that can be driven at the rear of the body frame 1. A tractor 4 is provided. A driving portion 5 is formed at the front of the vehicle body of the riding tractor 4. The prime mover 5 includes an engine (not shown) that outputs driving force such as the front wheels 2 and the rear wheels 3. A driving section 6 is provided in the rear half of the vehicle body of the riding tractor 4. The driving unit 6 is equipped with a driving seat 7 and a steering wheel 8 that steers the front wheels 2, and the riding tractor 4 becomes a riding type so as to be mounted on the driving unit 6 and operated. Yes. A front loader 9 is connected to the front part of the vehicle body of the riding tractor 4. A backhoe device 10 is connected to the rear part of the vehicle body of the riding tractor 4.

The backhoe device 10 will be described.
As shown in FIG. 1, the backhoe device 10 includes a connecting portion 11 that is detachably connected to a rear portion of a vehicle body frame 1 that is a rear portion of the vehicle tractor 4, and a backhoe working portion 20 that is supported by the connecting portion 11. It is equipped with.

  As shown in FIG. 1, the connecting portion 11 is connected to the vehicle body frame 1 so that the connecting shaft 12 provided at the lower portion on the front end side of the connecting portion 11 and the connecting shaft 12 are detachably engaged. A hook portion (not shown) provided on the vehicle body frame 1, a connecting mechanism 13 provided on the upper portion of the front end side of the connecting portion 11, and an openable / closable hook 14 provided in the connecting mechanism 13 are detachable. This is performed by a connecting shaft 15 provided on the body frame 1 so as to be engaged.

  As shown in FIG. 1, the backhoe working unit 20 includes a swing bracket 21 supported on the rear portion of the connecting portion 11 so as to be swingable left and right, a boom 22 supported on the swing bracket 21 so as to be swingable up and down, and a boom 22. The arm 23 is supported at the tip of the arm 23 so as to be swingable up and down, and the bucket 24 is supported at the tip of the arm 23 so as to be swingable. The stabilizer 25 is extended from the left and right end portions of the connecting portion 11 so as to be able to swing up and down over the raised storage posture and the lowered use posture. A swing cylinder 26 is connected across the connecting portion 11 and the swing bracket 21. A boom cylinder 27 is connected to the swing bracket 21 and the boom 22. An arm cylinder 28 is connected to the boom 22 and the arm 23. A link mechanism 29 is mounted across the bucket 24 and the tip of the arm 23. A bucket cylinder 30 is connected across the link mechanism 29 and the arm 23.

  As shown in FIG. 1, the connecting portion 11 is provided with a steering step 31 formed on the upper portion of the connecting portion 11 and a control tower 32 standing on the steering step 31. A pair of left and right operation levers 33 are provided on the upper portion of the control tower 32 so as to be swingable, and the backhoe working unit 20 is operated by the left and right operation levers 33. Specifically, the operation lever 33 is configured as follows. It is.

  As shown in FIG. 2, the control tower 32 includes a first frame 34, a second frame 35 in which left and right side frame portions 35 a are separately located on both lateral sides of the first frame 34, a first frame 34, and A cover 36 covering the second frame 35 is provided. The second frame 35 includes a top frame portion 35b connected to the upper end portions of the left and right side frame portions 35a. The cover 36 includes a cylindrical lower cover portion 36 a that covers the lower portions of the first frame 34 and the second frame 35, and an upper cover portion 36 b that covers the upper portions of the first frame 34 and the second frame 35.

  As shown in FIG. 2, a boss portion 37 is formed at the upper end portion of the first frame 34. As shown in FIGS. 2 and 4, the left operation lever 33 has a tip end side that extends upward from the inside of the control tower 32 to the outside through the lever hole of the top frame portion 35 b and the lever hole of the upper cover portion 36 b. It is supported by the boss part 37 in a protruding state.

  The backhoe device 10 includes an operation lever 33 that can operate the backhoe working unit 20. As shown in FIGS. 2 and 4, the base portion 33 a of the left operation lever 33 is supported by the boss portion 37 via the lateral support shaft 38 and the intermediate support 39. The intermediate support 39 includes a bifurcated portion 39a that sandwiches the base portion 33a from both lateral sides, and a longitudinal support shaft 39b that extends from the bifurcated portion 39a toward the rear of the vehicle body. The bifurcated portion 39a and the base portion 33a are connected to each other via a lateral support shaft 38 so as to be relatively rotatable. The longitudinal support shaft 39b is supported by the boss portion 37 via a bearing 40 so as to be relatively rotatable.

  The left operating lever 33 is swingable in the lateral direction of the vehicle body with the axial center of the longitudinally supporting shaft 39b extending in the longitudinal direction of the vehicle body as a first swinging center X, and in the lateral direction of the vehicle body of the laterally supporting shaft 38. The extending shaft core is supported so as to be swingable in the longitudinal direction of the vehicle body with the second swing center Y as the center. The operation lever 33 can perform a so-called cross swing operation.

  As shown in FIGS. 2, 4, and 5, the intermediate support 39 is formed with a first output portion 41 that is biased laterally with respect to the first swing center X. The first output unit 41 is interlocked and connected to the operation unit 43 a of the control valve 43 of the swing cylinder 26 located below the control tower 32 by an interlocking rod 44. A second output portion 45 is formed on the base portion 33a so as to be biased toward the rear side of the vehicle body with respect to the second swing center Y. The second output part 45 is interlocked and connected to the operation part 46 a of the control valve 46 of the arm cylinder 28 located below the control tower 32 by an interlocking rod 47. The control valve 43 and the control valve 46 are provided in the control valve unit 42. The control valve unit 42 is supported by the frame portion 11 a of the connecting portion 11.

  Although not shown, the right operation lever 33 is supported by the first frame 34 so as to be able to perform a left-right swing operation and a front-rear swing operation by a support structure having the same configuration as the support structure of the left operation lever 33. The right operating lever 33 is interlocked and connected to the control valves of the boom cylinder 27 and the bucket cylinder 30 provided in the control valve unit 42 by a connecting structure having the same configuration as the connecting structure of the left operating lever 33.

  When the backhoe working unit 20 is operated, the driver seat 7 is used by changing the posture from a forward mounting posture to the vehicle body to a rearward mounting posture with respect to the vehicle body. Then, by swinging the left operating lever 33 in the lateral direction of the vehicle body with respect to the neutral position, the intermediate support 39 swings with the operating lever 33 around the first swing center X as the first swing center. The output unit 41 moves the interlocking rod 44 up and down, the control valve 43 is switched by the interlocking rod 44 to control the swing cylinder 26, the swing cylinder 26 expands and contracts to swing the swing bracket 21 left and right, The boom 22, the arm 23, and the bucket 24 can be integrally swung in the left-right direction of the vehicle body.

  By swinging the left operating lever 33 in the longitudinal direction of the vehicle body with respect to the neutral position, the second output unit 45 swings with the operating lever 33 with the second swing center Y as the swing center, and the interlocking rod. 47, the control valve 46 is switched by the interlocking rod 47 to control the arm cylinder 28, the arm cylinder 28 is expanded and contracted to swing the arm 23, and the arm 23 is swung up and down. it can.

  By swinging the right operation lever 33 in the lateral direction of the vehicle body or in the longitudinal direction of the vehicle body with respect to the neutral position, the boom cylinder 27 is expanded and contracted to swing the boom 22 and swing the boom 22 up and down. The bucket cylinder 30 can be expanded and contracted to operate the link mechanism 29, and the bucket 24 can be swung.

  As shown in FIGS. 2 and 5, the backhoe device 10 includes a lock mechanism 50 that can be switched between a locked state in which the operation lever 33 is fixed at the neutral position and a lock release state in which the neutral fixation of the operation lever 33 is released. Yes. The lock mechanism 50 is built in the control tower 32. Further, the backhoe device 10 includes a swing lever 51 that can switch the lock mechanism 50 between a locked state and an unlocked state. In other words, by operating the swing lever 51 (see FIGS. 1 and 6) provided on the lateral outer side of the control tower 32 on the right side of the vehicle body, the left operation lever 33 is neutralized by the lock mechanism 50. It is configured so that it can be fixed at a position, or neutral fixing by the lock mechanism 50 of the left operating lever 33 can be released. Specifically, it is configured as follows.

  As shown in FIGS. 2, 3, 5, and 9, the lock mechanism 50 includes a locking portion 52 provided on the base portion 33 a of the left operation lever 33 and a lock spool 53 that can be engaged and disengaged with the locking portion 52. I have.

  As shown in FIGS. 2, 3, 5, and 9, the locking portion 52 is formed with an engagement hole 54 that opens downward. The entrance portion 54a of the engagement hole 54 is formed in a tip-expanding shape. The back side portion 54b located on the back side of the entrance portion 54a in the engagement hole 54 is formed in a cylindrical circumferential surface shape.

  As shown in FIGS. 2 and 3 and the like, the lock spool 53 is supported by a support portion 55 provided in the first frame 34 so as to be vertically slidable. An upper end portion 53 a (corresponding to an end portion) of the lock spool 53 is configured as a round shaft portion 56 that can be engaged with the engagement hole 54. The tip end portion 56a of the round shaft portion 56 is formed in a tapered shape. The lower part 56b located below the tip part 56a of the round shaft part 56 is formed in a cylindrical peripheral surface shape.

  As shown in FIGS. 2 and 5, when the lock spool 53 is raised to the raised lock position, the round shaft portion 56 is moved until the lower portion 56 b of the round shaft portion 56 enters the back side portion 54 b of the engagement hole 54. By engaging with the engaging hole 54, the upper end portion 53 a engages with the locking portion 52, swings about the first swing center X of the locking portion 52, and the first of the locking portions 52. 2 The lock spool 53 fixes the locking portion 52 so as not to swing, and the lock mechanism 50 fixes the operation lever 33 in the neutral position so that the swing about the swing center Y becomes impossible. Become locked.

  When the upper end portion 53a tries to engage with the locking portion 52, the operation lever 33 is slightly displaced from the neutral position, and the locking portion 52 and the upper end portion 53a are aligned as shown in FIG. Even in the positional relationship of the shifted state, the tip end portion 56 a enters the engagement hole 54 due to the taper of the tip end portion 56 a of the round shaft portion 56 and the taper of the inlet portion 54 a of the engagement hole 54. Thereafter, when the round shaft portion 56 enters the back side of the engagement hole 54, the lower portion 56 b of the cylindrical peripheral surface shape of the round shaft portion 56 and the back side portion of the cylindrical peripheral surface shape of the engagement hole 54. 54b opposes, the round shaft portion 56 enters the engagement hole 54 while correcting the misalignment between the locking portion 52 and the upper end portion 53a, and the lock mechanism 50 is positioned relative to the neutral position. The shifted operation lever 33 is corrected and fixed to the neutral position.

  As shown in FIG. 3, when the lock spool 53 is lowered to the lowering release position, the round shaft portion 56 comes out of the engagement hole 54 and the upper end portion 53a releases the engagement with the locking portion 52. The lock spool 53 releases the locking of the locking portion 52, and the lock mechanism 50 enters the unlocked state so as to release the neutral fixing of the operation lever 33.

  The support portion 55 is equipped with a detent mechanism 57 that positions the lock spool 53 at the raised lock position and the lowered release position. As shown in FIG. 2, when the lock spool 53 is positioned at the lift lock position, the detent mechanism 57 engages the positioning sphere 57a with the annular recess 53b of the lock spool 53 and positions the lock spool 53 at the lift lock position. . As shown in FIG. 3, when the lock spool 53 is located at the lowering release position, the detent mechanism 57 engages the positioning sphere 57a with the annular recess 53c of the lock spool 53 and positions the lock spool 53 at the lowering release position. .

  As shown in FIGS. 2, 3, 5, and 6, the rotation operation shaft 58 of the lock mechanism 50 is supported on a support portion 59 formed on the first frame 34 so as to be relatively rotatable. An arm portion 58 a provided at the end portion of the rotation operation shaft 58 so as not to be relatively rotatable is engaged with the lock spool 53 via a connecting pin 60 so as to be capable of only relative swinging. A swing lever 51 is connected to an end of the rotation operation shaft 58 that protrudes laterally outside the right side of the vehicle body of the lower cover portion 36a.

  As shown in FIGS. 5 and 6, the rotation operation shaft 58 and the swing lever 51 are connected to each other by a connection support member 51a connected to the rotation operation shaft 58 by a connection pin 61 so as not to be relatively rotatable, and a connection support member 51a. The fulcrum pin 61a connects the swing lever 51 to the connection support member 51a with the proximal end portion 51c of the swing lever 51 sandwiched between the slit portion 51b. That is, the backhoe device 10 includes a connection support member 51a that supports the swing lever 51 so as to swing around the swing axis P. The entire connection support member 51a has a substantially cylindrical shape. As shown in FIGS. 5 and 8, the base end 51c of the swing lever 51 is a flat plate. The plate width of the base end portion 51c of the swing lever 51 is substantially the same as the width of the slit portion 51b of the connection support member 51a. The base end 51c of the swing lever 51 is joined by a fulcrum pin 61a that is a shaft member. The axis of the fulcrum pin 61a is a swing axis P.

  As shown in FIG. 5 and the like, the swing lever 51 is supported on the rotation operation shaft 58 so as not to be relatively rotatable. The swing lever 51 operates the lock mechanism 50 by swinging around the rotation axis Q that is the center of the connection support member 51a. The swing lever 51 is urged by a tension spring 69 in a direction in which the lock mechanism 50 is locked or unlocked. Further, the swing lever 51 extends from the connection support member 51a upward in the vehicle body.

The swing regulation of the swing lever 51 will be described.
As shown in FIGS. 5 and 8, the connection support member 51 a includes a first stopper portion 70, a second stopper portion 71, and a step portion 72 positioned between the first stopper portion 70 and the second stopper portion 71. And. The first stopper portion 70, the second stopper portion 71, and the stepped portion 72 are formed by cutting a member before processing of the columnar connection support member 51a using, for example, a milling cutter having a columnar end mill. The

  As shown in FIGS. 5 and 8, the first stopper portion 70 is in contact with the swing lever 51 when the lock mechanism 50 is in the locked state or the unlocked state, so that the first direction D1 of the swing lever 51 (airframe) The swing in the direction toward the left and right center) can be restricted. In the present embodiment, when the swing lever 51 comes into contact with the first stopper portion 70, the base end portion 51c of the swing lever 51 and the first stopper portion 70 are in surface contact.

  As shown in FIGS. 5 and 8, the second stopper portion 71 is positioned below the first stopper portion 70 at a position farther from the swing axis P of the swing lever 51 than the first stopper portion 70. When the mechanism 50 transitions between the locked state and the unlocked state, the swinging of the swinging lever 51 in the second direction D2 opposite to the first direction D1 can be restricted by contacting the swinging lever 51. It has become. When the swing lever 51 comes into contact with the second stopper portion 71, the swing lever 51 and the second stopper portion 71 are in line contact. A lower end portion 71 a of the second stopper portion 71 has a non-linear shape in the direction of the rotation axis Q perpendicular to the oscillation axis P of the oscillation lever 51. In other words, the lower end portion 71 a of the second stopper portion 71 has a downwardly convex arc shape in the direction of the rotation axis Q perpendicular to the oscillation axis P of the oscillation lever 51.

  Thereby, it is possible to avoid collision of the shaft portion 51 d extending in the longitudinal direction of the swing lever 51 with the edge portion of the guide groove of the lever guide 62.

  As shown in FIG. 8, the stepped portion 72 has a non-linear shape when viewed in the direction of the rotation axis Q perpendicular to the swing axis P of the swing lever 51. In other words, the stepped portion 72 has a lower end portion 72a, which is located at both ends of the center portion 72b, as viewed in the direction of the rotation axis Q perpendicular to the swing axis P of the swing lever 51. It has an open shape. More specifically, the stepped portion 72 has a circular arc shape that is convex upward when viewed in the direction of the rotation axis Q perpendicular to the oscillation axis P of the oscillation lever 51.

The lever guide 62 will be described.
As shown in FIG. 7 and the like, the backhoe device 10 includes a lever guide 62 that can guide the swing lever 51. The lever guide 62 is supported by the lower cover portion 36 a in the control tower 32. The lever guide 62 includes a lock guide groove 65 in which the rocking lever 51 comes into contact with the first stopper portion 70 and the lock mechanism 50 is locked, and the rocking lever 51 comes into contact with the first stopper portion 70 and lock mechanism 50. Is connected to the release guide groove 66 that is unlocked, and the lock guide groove 65 and the release guide groove 66 are connected, and the swing lever 51 is swung while the swing of the swing lever 51 is restricted by the second stopper portion 71. And a switching guide groove 63 that can be swung around a rotation axis Q that is orthogonal to the axis P.

  In other words, as shown in FIG. 7 and the like, the switching guide groove 63 is formed in a portion of the lever guide 62 closer to the control tower 32 side. The lever guide 62 is provided with a locking portion 64 provided on the lateral side of the switching guide groove 63 opposite to the control tower 32 side. The lock guide groove 65 extends from one end portion of the switching guide groove 63 to an operation position facing the lock locking portion 64 a in the locking portion 64. The release guide groove 66 extends from the other end portion of the switching guide groove 63 to an operation position facing the release locking portion 64 b in the locking portion 64.

  One end portion of the switching guide groove 63 and the lock guide groove 65 are configured to guide the rocking lever 51 so as to position the rocking lever 51 in the lock operation area 67 of the operation area of the rocking lever 51. It is. The other end of the switching guide groove 63 and the release guide groove 66 guide the swing lever 51 so that the swing lever 51 is positioned in the unlocking operation area 68 of the swing lever 51 operation area. It is configured to do.

  When the swing lever 51 is positioned in the switching guide groove 63, the guide shaft is guided by the switching guide groove 63 with the axis of the rotation operation shaft 58 as a swing fulcrum, and swinging is performed to one end of the switching guide groove 63. The moving lever 51 is positioned at one end portion of the lock operation area 67 by the guide of the switching guide groove 63 and rotates the rotation operation shaft 58 to the lock side, and the lock spool 53 is moved up to the lifted lock position by the arm portion 58a. The lock mechanism 50 is locked. At this time, even if the operation lever 33 is slightly displaced with respect to the neutral position, the misalignment between the locking portion 52 and the round shaft portion 56 is corrected by entering the engagement hole 54 of the round shaft portion 56, The operation lever 33 is corrected and fixed at the neutral position.

  When the operation lever 33 is fixed at the neutral position, the swing lever 51 is guided along the rotation operation shaft 58 and guided to the lock guide groove 65, and the end of the lock guide groove 65 opposite to the switching guide groove side. When the slide lever 51 is slid, the swing lever 51 is positioned at the end of the lock operation area 67 by the guide by the lock guide groove 65, and is locked at this position by the lock locking portion 64a, thereby holding the lock mechanism 50 in the locked state. It is possible to prevent the swing lever 51 from switching to the unlocking operation area 68.

  When the swing lever 51 is positioned in the switching guide groove 63, the shaft center of the rotation operation shaft 58 is used as a swing fulcrum, the guide is guided by the switching guide groove 63, and the swing operation is performed to the other end of the switching guide groove 63. The swing lever 51 is positioned at one end portion of the unlocking operation area 68 by the guide of the switching guide groove 63 to rotate the rotation operation shaft 58 to the unlocking side, and the lock spool 53 is moved to the lowering release position by the arm portion 58a. The lock mechanism 50 is unlocked by being lowered.

  When the neutral fixing of the operation lever 33 is released, the swing lever 51 is guided along the rotation operation shaft 58 and guided to the release guide groove 66, and the end of the release guide groove 66 opposite to the switching guide groove side. When the slide lever 51 is slid to the end, the swing lever 51 is positioned at the end of the unlocking operation area 68 by the guide by the release guide groove 66, and is locked at this position by the release locking portion 64 b, and the lock mechanism 50 is unlocked. And the swing lever 51 can be prevented from switching to the lock operation area 67.

  Further, for example, in this embodiment, as shown in FIG. 1, the swing lever 51 extends upward at a position on the side surface of the control tower 32 that is close to the driver's seat 7 and is relatively easy to operate. Is provided. For this reason, it is not necessary to make the length of the swing lever 51 too long. That is, as shown in FIGS. 2, 3, and 5, the length of the lever extending from the rotation axis Q (the rotation center of the connection support member 51 a and the rotation operation shaft 58) that is the rotation fulcrum of the swing lever 51 can be shortened. . As a result, the amount of operation of the swing lever 51 can be reduced, but even if the length of the arm portion 58a that connects the rotation operation shaft 58 and the lock spool 53 is short, the distance by which the lock spool 53 moves vertically is sufficient. The lock mechanism 50 can be suitably operated by the swing lever 51.

[Another embodiment]
Hereinafter, another embodiment in which a part of the above embodiment is changed will be described. Each of the other embodiments is the same as the above embodiment except for the matters described. Each of the different embodiments can be applied in combination with the above embodiment as long as no contradiction occurs. The scope of the present invention is not limited to the contents shown in each embodiment.

(1) In the above embodiment, the swing lever 51 does not come into contact with the stepped portion 72 when the swing lever 51 comes into contact with the second stopper portion 71. However, the present invention is not limited to this. For example, as in another embodiment shown in FIGS. 10 and 11, when the swing lever 51 swings in the second direction D2 and the swing lever 51 comes into contact with the second stopper portion 71, the swing lever 51 may contact the stepped portion 172. In this case, the height of the lower end 172a, which is both ends of the stepped portion 172, is substantially the same as the height of the swing axis P. In this case, as shown in FIG. 11, the swing lever 51 is in line contact with and comes into contact with the second stopper portion 71, and the swing lever 51 is in point contact with the step portion 172 at two points. Become. Also in this case, the stepped portion 172 has a non-linear shape when viewed in the direction of the rotation axis Q perpendicular to the oscillation axis P of the oscillation lever 51. In other words, the stepped portion 72 has a lower end portion 172a that is located at both ends of the lower portion 172a below the central portion 172b when viewed in the direction of the rotation axis Q perpendicular to the swing axis P of the swing lever 51. It has an open shape. More specifically, the stepped portion 172 has an upwardly convex arc shape when viewed in the direction of the rotation axis Q perpendicular to the oscillation axis P of the oscillation lever 51.

(2) In the other embodiment, the stepped portion 172 has an upwardly convex arc shape when viewed in the direction of the rotation axis Q perpendicular to the oscillation axis P of the oscillation lever 51. However, it is not limited to this. For example, as in another embodiment shown in FIG. 12, the stepped portion 272 has a V-shape that protrudes upward when viewed in the direction of the rotation axis Q perpendicular to the oscillation axis P of the oscillation lever 51. May be.

(3) In the above embodiment, the lower end portion 71 a of the second stopper portion 71 has a circular arc shape that protrudes downward in the direction of the rotation axis Q perpendicular to the oscillation axis P of the oscillation lever 51. Although the thing is illustrated, it is not restricted to this. For example, as in another embodiment shown in FIG. 13, the lower end portion 371 a of the second stopper portion 71 is more than the central portion 371 ab in the rotation axis Q direction perpendicular to the oscillation axis P of the oscillation lever 51. The lower end portion 371aa which is both end portions has a downward opening shape located below. Further explaining, in FIG. 13, the lower end portion 371 a of the second stopper portion 371 has an arc shape that protrudes upward in the direction of the rotation axis Q perpendicular to the oscillation axis P of the oscillation lever 51. ing. Further, unlike FIG. 13, the lower end portion 71 a of the second stopper portion 71 has an inverted V shape that protrudes upward in the direction of the rotation axis Q perpendicular to the oscillation axis P of the oscillation lever 51. It may be.

  As a result, the flat rocking lever 51 abuts by point contact at two points of the stepped portion 172 and two points of the lower end portion 371a, and the rocking is restricted. Even if wear of the swing lever 51, the stepped portion 172, and the lower end portion 371a progresses, the contact point of the stepped portion 172 and the lower end portion 371a gradually moves toward the center side. It does not change so much, and the feeling of operation of the swing lever 51 does not occur.

(4) In the above embodiment, an example in which only one step is provided is illustrated, but the present invention is not limited to this. For example, a plurality of step portions may be provided. In this case, since the swing of the swing lever 51 can be regulated by a plurality of step portions, the swing angle of the swing lever 51 by the step portion is not easily changed even if the wear of the member progresses.

(5) In the said embodiment, although the thing provided with the step part is illustrated, it is not restricted to this. For example, instead of the stepped portion, an inclined surface that linearly connects the contact portion of the swing lever 51 in the first stopper portion 70 and the contact portion of the swing lever 51 in the second stopper portion 71 may be provided. . In this case, it is preferable that the inclined surface comes into surface contact with the swing lever 51 when the swing lever 51 comes into contact with the second stopper portion 71.

(6) In the above-described embodiment, the lever guide 62 is provided. However, the lever guide 62 may not be provided.

(7) The left and right structures may be reversed from the above embodiment.

  INDUSTRIAL APPLICABILITY The present invention can be used for a backhoe device provided with a backhoe working unit, and a tractor backhoe provided with such a backhoe device.

DESCRIPTION OF SYMBOLS 10: Backhoe apparatus 11: Connection part 20: Backhoe working part 33: Operation lever 50: Lock mechanism 51: Swing lever 62: Lever guide 63: Switching guide groove 65: Lock guide groove 66: Release guide groove 70: First stopper Part 71: Second stopper part 72: Step part 72a: Lower end part 72b: Center part 371a: Lower part P: Swing axis Q: Rotating axis 172: Step part 172a: Lower end part 172b: Center part 272: Step Part

Claims (8)

A connecting part detachably connected to the rear part of the vehicle body of the riding tractor;
A backhoe working part supported by the connecting part;
An operation lever capable of operating the backhoe working unit;
A lock mechanism that can be switched between a lock state in which the operation lever is fixed at a neutral position and a lock release state in which the operation lever is neutrally fixed; and
A swing lever capable of switching the locking mechanism between the locked state and the unlocked state;
A first stopper portion capable of restricting the swing of the swing lever by contacting the swing lever when the lock mechanism is in the locked state or the unlocked state;
The lock mechanism is located below the first stopper portion at a position farther from the swing axis of the swing lever than the first stopper portion, and the lock mechanism transitions between the locked state and the unlocked state. And a second stopper portion capable of restricting the swing of the swing lever by contacting the swing lever.   The backhoe device according to claim 1, further comprising a step portion positioned between the first stopper portion and the second stopper portion.   3. The backhoe device according to claim 2, wherein the stepped portion has a non-linear shape when viewed in the direction of the rotational axis perpendicular to the pivot axis of the swing lever.   4. The step according to claim 2, wherein the step portion has a downward opening shape in which both end portions are located below the center portion when viewed in the direction of the rotational axis perpendicular to the swing axis of the swing lever. The backhoe device as described.   The backhoe according to any one of claims 2 to 4, wherein the stepped portion has an upwardly convex arc shape when viewed in the direction of the rotational axis perpendicular to the oscillation axis of the oscillation lever. apparatus.   6. The lower end portion of the second stopper portion has a non-linear shape in a rotational axis direction orthogonal to the oscillation axis of the oscillation lever. Backhoe device. A lever guide capable of guiding the swing lever;
In the lever guide,
A lock guide groove in which the rocking lever comes into contact with the first stopper and the lock mechanism is in the locked state;
A release guide groove in which the rocking lever comes into contact with the first stopper portion and the lock mechanism is in the unlocked state;
The lock guide groove and the release guide groove are connected, and the swing lever is moved around the rotation axis orthogonal to the swing axis while the swing of the swing lever is restricted by the second stopper portion. The backhoe device according to any one of claims 1 to 6, further comprising a switching guide groove capable of swinging.   A tractor backhoe provided with the backhoe device according to any one of claims 1 to 7.

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