JP5960525B2 - Work vehicle - Google Patents

Description

  The present invention relates to a work vehicle having an operation unit in the longitudinal direction of a machine body like a tractor with a backhoe, and more particularly to a rotating seat that can be operated in the longitudinal direction by rotating.

  2. Description of the Related Art A work vehicle such as a tractor provided with a front loader in front of the body and a backhoe behind the body is known. The work vehicle is provided with a single rotating seat that can be used for both forward and backward operation. The rotating seat is rotatable between a forward-facing position and a backward-facing position, and is supported by a support device such as a link mechanism. The rearward position is supported so as to be higher than the forward position (see Patent Documents 1 and 2).

  Conventionally, the rotating sheet is provided on a swivel base that is rotatably supported by a vertical axis on a support base provided on a support device, and between the swivel base and the support base every 180 degrees or 90 degrees. An engaging member for restricting the rotational position is arranged for each time, and the rotating member is positioned at the forward position and the backward position by operating the engagement member with an operating tool provided on the swivel base. The operator sitting on the rotating seat fixed at the forward position operates the tractor and the front loader, and the operator sitting on the rotating seat fixed at the rearward position operates the backhoe. Further, when the operator is seated on the rotating seat, it is detected by the seat switch, and the engine start is permitted.

JP-A-7-277053 Japanese Patent No. 3808729

  The conventional rotating seat can be rotated 360 degrees in either direction, even if there is a restricting member, and the wire for the seat switch wired to the rotating seat from the traveling machine body is twisted to break the wire. There are things to do. Further, when the rotating sheet is locked by the operating tool at the reverse position, the operation of engaging the engaging member with the forward position or the backward position is troublesome. In addition, depending on the direction of rotation of the rotating seat, parts such as a slide lever and seat belt attached to the rotating seat may come into contact with the operating lever arranged on the traveling machine body. The arrangement of the seat and the operation lever is limited.

  Then, this invention aims at providing the work vehicle which solved the subject mentioned above by restricting the rotation range of a rotation seat to 180 degree | times.

The present invention provides a work vehicle including a rotating seat (5) rotatable with respect to a traveling machine body (3).
A swing member (29) swinging with one end supported by the traveling machine body (3);
A front end portion is rotatably supported at the other end of the swing member (29), and is movable between a low position on the front side and a high position on the rear side as the swing member (29) swings. A support base (13);
When the support base (13) is in the low position on the front side, the support base (13) is allowed to fall down while allowing the rear end of the support base (13) to move up and down. A prevention member (39);
A swivel base, which is supported above the support base (13) so as to be rotatable about a vertical axis (14) extending in the vertical direction with respect to the support base (13) and provided with the rotary seat (5). (15) and
An engaging member capable of locking the swivel base (15) to the support base (13);
When the rotating seat (5) is facing forward, it is in front of the longitudinal axis (14) and protrudes from the support base (13) and the swivel base (15) in one of the left and right directions. An operation tool (20) disposed between an upper surface of the support base (13) and a lower surface of the swivel base (15) and capable of releasing the lock of the swivel base (15) by the engagement member;
Said support base and said upper surface and said swivel stand (13) wherein the longitudinal axis for the one of the lower surface (15) one restriction member fixed to the outer peripheral portion with respect to (14) (21),
It said support base said top surface and for the other one of the lower surface of the revolving base of the longitudinal axis (14) a pair of which is fixed to the opposite side of the longitudinal axis of the outer peripheral portion (14) against A contact member (22),
Rotation of the rotating sheet (5) when the locking of the swivel base (15) is released by the regulation member (21) coming into contact with one of the pair of contact members (22). The range is restricted to 180 degrees.

Preferably, a roller (36) disposed at the rear end of the support (13);
An inclined plate (30) formed to be inclined upward and rearwardly behind the rocking member (29) and guiding the roller (36);
An arm (37) attached to the rear end of the support base (13) and inserted through the inclined plate (30),
The fall prevention member (39) is a pin attached to the tip of the arm (37),
When the rotating seat (5) is in the low position on the front side, the rotating seat (5) can be tilted forward within a range in which the arm (37) is secured to the inclined plate (30) by the pin (39) .

  In addition, although the code | symbol in the said parenthesis is for contrast with drawing, it does not have any influence on the structure as described in a claim by this.

  According to the first aspect of the present invention, since the rotation range of the rotating seat with respect to the traveling machine body is restricted to 180 degrees, a wire such as a sheet switch led from the rotating sheet to the traveling machine body is not twisted by 180 degrees or more. .

  The rotating sheet is a peripheral part in which the rotation direction from the forward position to the rearward position and the rotation direction from the rearward position to the forward position are respectively defined, and the parts of the rotating sheet can be prevented from contacting the peripheral parts. In addition to preventing erroneous operation of the operating lever, the degree of freedom in designing the arrangement of the rotating seat and peripheral components can be increased.

  The rotating sheet is positioned by contacting the regulating member with one of the abutting members at the forward position and the rearward position rotated by 180 degrees, so that the fixing operation at the rotational position of the rotating sheet becomes reliable and easy.

In addition , the rotating sheet can be rotated to the forward position or the backward position by releasing the fixing with the operation tool in a state where the rotating sheet is in the upper position on the rear side by the support device, for example . It can be rotated at a high position with little interference.

The perspective view which shows the driver's seat part of the tractor in the state which turned the rotation seat to the front position. The perspective view which shows the driver's seat part of the tractor of the state which made the rotation seat the back position. The perspective view which shows a rotation sheet | seat. The perspective view which shows the support apparatus of the rotation sheet | seat in a front low position. The perspective view which shows the said support apparatus in a back side high position. The rear view of the said support apparatus. The side view which shows the support apparatus of the rotation sheet | seat in a front low position. The side view which shows the state which the load of the front acted on the rotation seat in the front low position. The side view which shows the rotation sheet | seat in a forward position. The side view which shows the support apparatus of the rotation sheet | seat in a back side high position. The side view which shows the rotation sheet | seat in a rearward position.

  Hereinafter, an embodiment of the present invention in which a tractor is applied as a work vehicle will be described. As shown in FIGS. 1 and 2, the tractor includes a driver's seat 2, and the driver's seat 2 has a rotating seat 5 disposed on a traveling machine body 3 supported by front wheels and rear wheels. . A front loader (not shown) is disposed in front of the traveling machine body 3 and a backhoe is disposed in the rear, and the tractor travel operation and the front loader operation are performed with the rotating seat 5 in the forward position. Then, the backhoe is operated in a state where the rotating seat 5 is in the rearward position. Further, the operation unit (peripheral parts) such as a position control lever 6, an external hydraulic pressure switching lever 7, a rear PTO lever 9, and a mid PTO lever 10 are arranged on the traveling body 3 in the left and right portions of the rotating seat 5. . A lops 11 is fixed to the traveling machine body 3 so as to surround the upper side of the rotating seat 5.

  The rotating seat 5 is supported by a support device 12 so as to be movable between a front low position shown in FIG. 1 and a rear low position shown in FIG. 2, and as shown in FIG. It is arranged on a swivel base 15 that is rotatably supported on a support base 13 fixed to the upper frame by a vertical axis 14 (indicated by a line in FIG. 7 and the like). Guide rails 17, 17 extending in the front-rear direction are arranged between the upper surface of the swivel base 15 and the rotary seat 5, and the rotary seat 5 is movable in the front-rear direction with respect to the swivel base 15 and a slide lever 19. Can be appropriately fixed at the front-rear position. Further, the swivel base 15 is provided with a rotation lock release lever (operation tool) 20 that protrudes in the width direction (specifically, in the left direction), and an engagement member (not shown) is operated by the lock lever 20. Thus, the engaging member can be engaged with a notch provided in the support base 13 to fix the rotating sheet 5 at the forward position or the rearward position.

  Abutting members 22, 22 are provided on the opposite side of the upper surface of the support 13 at 180 ° across the vertical axis 14, respectively, so as to protrude upward. The one restricting member 21 is provided so as to protrude downward. The position where one of the two contact members 22, 22 is in contact with the one regulating member 21 is defined so that the rotating sheet 5 is in a forward-facing position. The position where the other is in contact with the one regulating member 21 is defined so that the rotating sheet 5 is in a rearward position. Therefore, the rotation range of the rotating sheet 5 is restricted to 180 degrees between the forward position and the backward position, and the rotation direction is defined in the circumferential direction. That is, when the rotating sheet 5 is rotated from the forward position to the rearward position, it is counterclockwise when viewed from above, and when it is rotated from the rearward position to the forward position, it is clockwise. Note that one support member may be provided on the support base 13 and a pair of contact members may be provided on the swivel base 15.

  Then, the rotating sheet 5 can be rotated by releasing the locking state by operating the lock release lever 20 from the locking state in which the engagement member (not shown) is engaged with the notch and is prevented from rotating. The rotating seat 5 is rotated in a state where the worker has descended from the traveling machine body 3. In general, the operator releases the lock on the left side of the traveling machine body 3 by operating the lock release lever 20 on the left front side of the rotating seat 5 so that the front side of the rotating seat 5 faces the operator side. Rotate to. That is, when the rotating sheet 5 is in the forward position, it rotates counterclockwise when viewed from above, and when the rotating sheet is in the backward position, it rotates clockwise. One of the two abutting members 22 abuts on one restricting member 21, and the locking member is locked in a state where the rotating sheet 5 is positioned at the frontward position or the rearward position. Locked. At this time, even when the lock release lever 20 performs a locking operation at the forward position or the backward position, the position is coincident with the positioning position of the restriction member and the contact member, and the operation can be easily and reliably performed.

  The lock release lever 20 may be provided so as to protrude to the front surface of the rotating seat 5 (the knee direction of the seating surface). In other words, the lock release lever 20 is arranged at a position close to the front surface of the seat or as far as possible, so that the lever can be rotated as compared with a lever that protrudes in either the left or right direction of the seat surface. Therefore, the rotating seat can be operated from the forward position to the rearward position or from the rearward position to the frontward position in a state where the operator is located on either the left or right side of the traveling machine body, and the rotation operation of the seat becomes easy.

  As shown in FIGS. 4 to 6, the support device 12 is disposed between a seat frame 25 fixed to the traveling machine body 3 and a support base 13 that rotatably supports the swivel base 15. . The support device 12 is fixed to the seat frame 25 and extends in the front-rear direction, and a pair of lower angle members 26 and 26 and a pair of upper angle members 27 fixed to the support base and extends in the front-rear direction. , 27, a pair of left and right arm members 29, 29 for connecting the front portions of the upper and lower angle members 26, 27, and an inclined plate 30 disposed at the rear portion. Both ends of the arm member 29 are connected to a lower shaft 24 and an upper shaft 28 that are spanned by a left and right lower angle member 26 and an upper angle member 27, respectively, and a front portion of the upper angle member 27 is connected to the lower angle member 26. And swingably supported between a front lower position and a rear upper position.

  The left and right upper angle members 27, 27 are connected at their front and rear portions by connecting plates 31, 32, respectively. A shaft 35 is supported on the rear connecting plate 32 by brackets 33, 33, and a pair of left and right rollers 36, 36 made of an elastic member such as rubber are rotatably supported on the left and right portions of the shaft 35. In addition, an arm 37 is supported at the central portion thereof so as to be freely rotatable with its distal end free. The inclined plate 30 is disposed so that the lower end portion thereof is integrally fixed to the seat frame 25 at the portion between the rear portions of the left and right lower angle members 26 and 26 and extends rearwardly upward. To be precise, as shown in detail in FIG. 7, the lower portion of the inclined plate 30 is an upright portion 30A having a large inclination angle in order to obtain a marginal space for the support device 12 at the lower position on the front side. The guide portion 30B has a gentle slope in order to smoothly guide the roller 36 and guide it to the rear side high position. Furthermore, the upper end portion of the inclined plate 30 extends rearward in a substantially horizontal direction (exactly slightly backwardly inclined), and a support portion 30C for supporting the rollers 36, 36 on the rear side high position. It has become.

  A slit 30D extending in the vertical (front-rear) direction is formed in the left and right central portion of the inclined plate 30, and the arm 37 is fitted into the slit 30D. A pin 39 such as a roll pin is passed through and fixed to the front end portion of the arm 37 in the left-right direction, and the rear end portion of the support device 12 comes out of the inclined plate 30 so that the rotating seat moves forward. To prevent it from falling down. The arm 37 may prevent lateral vibration by using an E-ring with respect to the shaft 35. However, in this case, a ring groove is formed in the shaft 35, so that the shaft strength may be reduced. There is also a problem of an increase in the number of points and an increase in the number of assembly steps. In this embodiment, as shown in FIGS. 4 and 5, a concave groove 32a is formed on the rear surface of the central portion of the connecting plate 32, and the arm (falling prevention plate) 37 is engaged with the concave groove 32a. As a result, the arm 37 is prevented from moving in the axial direction (lateral shake). As a result, the above problem is solved.

  On the seat frame 25 between the left and right lower angle members 26, 26 and in the front portion of the inclined plate 30, suspension springs 40, 40, 40 comprising three coil springs are provided side by side in the left-right direction. Yes. These springs 40 are in contact with the rear portion of the support base 13 and elastically suspend the rotating sheet when the rotating sheet is in the lower position on the front side. The lower ends of the springs 40 are fixed to the seat frame 25. A plate that supports the lower ends of the springs 40 is provided so as to be movable in the longitudinal direction of the machine frame with respect to the seat frame 25. The suspension load may be changed.

  Accordingly, in the support device 12, the upper angle member 27, which is the support portion of the rotating seat, is supported by the arm member 29 so that the upper angle member 27 is swingable with respect to the lower angle member 26, which is a fixed member, and the rear thereof is an inclined plate. 30, the roller 36 is guided upward so that it can be moved between a low position on the front side and a high position on the rear side, and the front side locking device 45 at the low position on the front side and the high position on the rear side. It is fixed and held by the rear locking device 60.

  The front-side locking device 45 has an operation shaft 46 that is rotatably supported over the front portions of the left and right lower angle members 26, 26. The operation shaft 46 projects forward from the central portion thereof to the U. A character-shaped operating lever 47 is fixed, and a pair of hooks 49 and 49 are fixed to the left and right portions so as to protrude upward. A spring 50 is stretched between the hook 49 and a bracket provided on the lower shaft 24, and urges the engaging portion 49a of the hook 49 in an engaging direction. As shown in FIG. 5, the tip 49 b of the hook 49 has an inclined surface, and the hook 49 (see FIG. 7) engaged with the lower angle members 26, 26 engages with the concave groove 49 c. The movable range is regulated. On the other hand, an intermediate shaft 51 is stretched across the intermediate portion of the left and right arm members 29, 29, and the intermediate shaft 51 becomes an engaged member that engages with the engaging portion 49 a of the hook 49.

  When the support device 12 is tilted to the lower position on the front side, the intermediate shaft 51 comes into contact with the tip portion 49b of the hook 49 and rotates against the spring 50, and the intermediate shaft 51 is turned to the tip portion 49b. The hook 49 is rotated by the spring 50 to engage the intermediate shaft 51 with the engaging portion 49a. Accordingly, when the operator sits on the rotary seat 5 with the rotary seat 5 in the forward position and the support device 12 moved toward the front lower position, the front lock device 45 is automatically locked. In this state, as shown in FIG. 4, the arm member 29 falls forward, the intermediate shaft 51 is supported by the recess 26 a formed in the left and right lower angle members 26, 26, and the engaging portion 49 a of the hook 49. The upper angle member 27, that is, the rotating sheet is in a state of being rotatable about the upper shaft 28. Then, the rear end portion of the rotating seat abuts on the suspension spring 40 to elastically support an operator sitting on the seat.

  As shown in detail in FIGS. 4 and 7, the arm member 29 is rotated by a pair of brackets 52, 52 that are fixed to protrude downward from the lower shaft 24 that is prevented from rotating by the lower angle member 26. Springs 55 and 55 are respectively stretched between a pair of brackets 53 and 53 that protrude upward and are fixed to the upper portion of the intermediate shaft 51 that is blocked. These springs 55 urge the arm members 29 and 29 in the rising direction against the gravity of the rotating seat.

  Therefore, when the operator stands up from the state of sitting forward on the rotary seat 5 and operates the operation lever 47 downward on the side of the traveling work machine, the hook 49 rotates against the spring 50. Then, the locking of the intermediate shaft 51 is released. As a result, the spring 55 rises upward against the weight load of the rotating seat 5, assisting the operator to move the rotating seat, and the support device 12 moves the rotating seat from the front low position to the rear high position. Move to position.

  As shown in FIGS. 6 and 7, the rear locking device 60 is disposed on the back surface of the inclined plate 30 and is provided on a back plate 61 that is a strength member that integrally fixes the inclined plate to the seat frame 25. ing. An operation shaft 62 is supported on the integral inclined plate 30 and the back plate 61 via a bracket. A pair of left and right hooks 63 is provided at the central portion of the operation shaft 62 and a U-shaped operation lever is provided at the central portion therebetween. 65 is rotatably supported, and the hook 63 and the operation lever 65 are integrally rotated and fixed to each other. A spring 66 is contracted between the operation lever 65 and the inclined plate 30 and urges the operation lever 65 and the hook 63 to engage with each other. The hook 63 has an engaging portion 63a that can engage with the shaft 35 that supports the rollers 36 and 36, and an inclined portion 63b that guides the shaft 35 to the engaging portion.

  When the support device 12 is moved to a high position on the rear side, the rollers 36 and 36 are guided by the guide portion 30B of the inclined plate 30 and moved obliquely upward. When the support device 12 reaches the support portion 30C of the inclined plate, the support portion 30C is slightly inclined downward toward the rear, and when the shaft 35 abuts against the inclined portion 63b, the hook 63 rotates against the spring 66, and the shaft 35 is It is received in the engaging portion 63a. Thereby, by moving the rotating sheet to the rear side high position, the hook 63 automatically rotates and engages and holds the shaft 35 which is the rear end portion of the support device 12. 36 and 36 are hold | maintained at the support part 30C of the inclination board 30, and the support apparatus 12, ie, a rotation sheet | seat, is hold | maintained at the back side high position.

  When the support device 12 is moved from the rear side high position, when the operator operates the operation lever 65 downward on the side of the traveling machine body, the hook 63 rotates to release the lock of the shaft 35. In this state, when the rotary sheet 5 is moved toward the front low position, the roller 36 is guided by the inclined plate 30 and moved.

  Since the work vehicle (tractor) is configured as described above, when the tractor is steered or front-loaded, the rotating seat 5 is located on the front side as shown in FIGS. In the low position and in the forward position. In this state, the support device 12 is locked by the front lock device 45 with the arm member 29 tilted forward and the rear portion elastically supported by the suspension spring 40, and the rotating seat 5 is in the forward position. Positioned and locked. In this state, when the operator sits on the rotating seat 5 and performs the traveling operation of the tractor or the operation of the front loader, the operator assumes a forward leaning posture, but as shown in FIG. Within the range where the pin 39 is prevented from being pulled out, the seat 5 is tilted forward, and the operator can work in a comfortable posture. However, even if the worker applies excessive load or the forward inertia by the worker acts from the seat belt 70, a moment in the forward tilting direction acts on the rotating seat 5 around the arm upper shaft 28. The retaining pin 39 provided at the tip of the arm 37 is prevented from being caught by the slit 30D of the inclined plate 30 and the rotating sheet 5 from being tilted forward.

  When the support device 12 is moved from the low position on the front side toward the high position on the rear side, the operator gets off the traveling machine body 3 and generally operates the operation lever 47 of the front lock device 45 from the left side. . As a result of this operation, the hook 49 unlocks the intermediate shaft 51, and the support device 12 is combined with the urging force of the spring 55 that is urged in the rising direction and the force that the operator moves with the operation lever 47. Thus, the support device 12 is moved in the rear high position direction shown in FIG. At this time, the arm members 29 and 29 are raised in the front portion of the support device 12, and the rear portion of the support device 12 is lifted by the roller 36 guided by the guide portion 30 </ b> B from the inclined plate 30 and lifted up to the support portion 30 </ b> C. As a result, the hook 63 is automatically engaged with the shaft 35 by the spring 66 and the rear side lock device 60 is positioned and held at the rear side high position.

  In this state, the operator operates the lock release lever 20 from the left side of the traveling machine body 3 to release the lock of the rotary seat 5, and rotates the rotary seat 5 so that the seat surface is in the front direction. When the rotating rearward position is reached, the restricting member 21 provided on the swivel base 15 is positioned on the support base 13 in contact with one of the pair of contact members 22, and the lever 20 is operated in this state. The rotating sheet 5 is automatically locked, and the state shown in FIGS. In this state, the operator sits on the rotating seat 5 and operates the backhoe.

  Further, in order to move the rotary seat 5 to the forward posture and the low position on the front side, the operator also stands on the left side of the traveling machine body, and the lock release lever 20 is in a state where the support device 12 is at the high position on the rear side. To rotate the rotating sheet 5. At this time, due to the contact between the regulating member 21 and one of the contact members 22, the rotating sheet 5 can only rotate in the direction in which the seating surface is in the forward direction. , And the restricting member 21 is locked at the forward position where it comes into contact with the other contact member 22.

  Accordingly, since the rotating seat 5 rotates in the same rotation range with the support device 12 in the high position, components such as the rotating seat 5 itself, the slide lever 19 and the seat belt 70 are arranged on the traveling machine body 3. The operation levers 6 and 9 are not touched, and the operation levers can be easily rotated without erroneous operation, and the degree of freedom in designing the rotating seat and peripheral parts can be improved.

  Then, in a state where the rotating seat 5 is locked in the forward position, the lock of the rear side lock device 60 is released by operating the operation lever 65, and the seat is supported by operating the operation force forward and downward. Move device 12 to the forward low position. As a result, the arm member 29 falls forward, the roller 36 is guided by the inclined plate 30 and moves forward and downward, and the hook 49 automatically locks the intermediate shaft 51 by the tip 49b and the spring 50. The support device 12 is positioned and held at the front low position by the front lock device 45.

  Therefore, when the support device 12 is moved to the lower position on the front side, the front locking device 45 is automatically locked without operating the operation lever 47 by pressing the rotating seat 5 fixed forward from above. . When the engagement of the hook 49 is not complete, the hook 49 reliably locks the intermediate shaft 51 by the operator sitting on the rotating seat 5.

  Moreover, since the operation lever 47 of the front side locking device 45 and the operation lever 65 of the rear side locking device 60 are both located in the center of the support device 12 in the width direction and are U-shaped, the operator can Operation is easy even if you sit on either side. Moreover, since both the operation levers 47 and 65 are arrange | positioned in the position close | similar to the rotation seat 5, operation is easy and can also be operated from the seating side.

  In addition, although embodiment mentioned above is applied to a tractor, a rotation seat is a front side low position in a front posture, and it is in a back side high position in a back posture, it is not restricted to this, it only rotates. The present invention can be similarly applied to other embodiments.

2 Driver's seat 3 Traveling machine body 5 Rotating seat 12 Support device 13 Support base 14 Vertical axis 15 Swivel base 20 Operating tool (Rotation lock release lever)
21 restriction member 22 contact member

Claims (2)

In a work vehicle having a rotating seat that can rotate with respect to a traveling machine body,
A swinging member swinging with one end supported by the traveling machine body;
A support base that is rotatably supported at the other end of the swing member, and is movable to a low position on the front side and a high position on the rear side as the swing member swings;
When the support base is at the low position on the front side, a fall prevention member that prevents the support base from falling forward while allowing the rear end of the support base to move up and down,
A swivel base that is rotatably supported around a vertical axis that extends in the vertical direction with respect to the support base and is provided with the rotating seat above the support base;
An engaging member capable of locking the swivel base to the support base;
When the rotating seat faces forward, the upper surface of the support base and the lower surface of the swivel base are in front of the vertical axis and protrude in one of the left and right directions from the support base and the swivel base. An operation tool that is disposed between and capable of releasing locking of the swivel base by the engagement member;
1 the regulating member fixed to the outer peripheral portion with respect to the longitudinal axis for the one of said top and said bottom surface of said swivel deck of the support platform,
And a contact member of a pair that is fixed to opposite side of the longitudinal axis of the outer peripheral portion with respect to the support base of the upper surface and the vertical axis against the other one of the lower surface of the swivel deck ,
The rotation range of the rotating sheet when the locking of the swivel is released is restricted to 180 degrees by the contact of the restriction member with one of the pair of contact members. Work vehicle. A roller disposed at the rear end of the support;
An inclined plate that is formed to be inclined upward and rearward at the rear of the swing member, and guides the roller;
An arm attached to the rear end portion of the support base and inserted through the inclined plate,
The overturn prevention member is a pin attached to the tip of the arm,
2. The work vehicle according to claim 1 , wherein when the rotating seat is in a low position on the front side, the rotating seat can tilt forward within a range in which the arm is secured to the inclined plate by the pin .

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