JP5870425B2 - Rotating sheet support device - Google Patents

Description

  The present invention relates to a rotating seat support device in a work vehicle, and more particularly to a rotating seat support device that supports a rotating seat with a suspension.

  Generally, work machines such as a front loader and a backhoe are mounted on a tractor that is a work vehicle. Since the backhoe is attached to the rear part of the fuselage behind the seat, when the driver performs work on the backhoe, it is necessary to face the opposite side to that during driving. In addition, since the operating tool for operating the backhoe is disposed at a position higher than the driving operating tool such as the steering handle, the backhoe is operated at a position higher than that during driving of the tractor. .

  By the way, when the tractor travels on a farm field or the like, the tractor may vibrate up and down due to unevenness of the farm scene. Such vibrations are not only stressful for the driver, but may interfere with the operation of the tractor.

  Therefore, conventionally, in a tractor in which a backhoe is mounted on the rear part of the fuselage, a seat reversing support device that turns the seat forward when the tractor is operated and reverses the seat backward when the backhoe is operated and increases the seat height position. Has been devised (see, for example, Patent Document 1). The seat reversing support device includes a turntable that supports the seat in a freely rotatable manner, a support stand attached to the tractor body, a link mechanism that connects the turntable and the support stand, and a spring that supports the link mechanism. Has been.

  The link mechanism is composed of front and rear link bodies, and the link body changes from a lying state to an upright state, and the seat supported by the turntable rotates (reverses) from the front direction to the rear direction. The seat is configured to change from the operating position of the tractor to the working position by the backhoe. Further, the link mechanism is supported by a spring so as to absorb vibration during traveling of the tractor and to reduce vibration transmitted to the driver.

Japanese Patent No. 3808729

  In the sheet reverse support device described in Patent Document 1, since the link mechanism that supports the turntable is supported by the spring, not only the suspension structure that supports the sheet becomes complicated, but also the vibration transmitted to the sheet. However, there is a possibility that the vibration cannot be sufficiently reduced so as not to hinder driving.

  Therefore, the present invention provides a rotating seat support device that solves the above-described problems by directly supporting the seat bracket with a vibration isolating member in a state where the seat bracket supporting the rotating seat is locked at the front lower position. The purpose is to provide.

The present invention relates to a rotating seat support device (17) in which a seat (3) is rotatably supported forward and rearward and movably supported between a front lower position and a rear upper position with respect to a vehicle body. ,
A seat bracket (19) for mounting the seat (3);
A seat frame (31) fixed to the vehicle body (33),
Left and right arms (26, 27) having a lower end rotatably connected to a front end side of the seat frame (31) and an upper end rotatably connected to a front end side of the seat bracket (19);
Anti-vibration members (45, 46) disposed on one of the seat frame (31) and the base (16) to which the seat (3) is attached and contacting the other while being locked at the front lower position; ,
A front lower position locking mechanism (35) capable of fixing the seat bracket (19) to the seat frame (31) at a position where the left and right arms (26, 27) are tilted forward;
In a state where the seat bracket (19) is held by the front lower position lock mechanism (35), the seat bracket (19) is pivotally supported on the front end side with respect to the seat frame (31), and The end side is in a free end state and is supported by the vibration isolating member (45, 46).

An inclined plate (47) provided on the rear end side of the seat frame (31) and inclined obliquely upward toward the rear;
Rollers (20, 21) disposed at the rear end of the seat bracket (19) and capable of moving on the inclined plate (47);
A rear upper position locking mechanism (56) capable of fixing the seat bracket (19) to the seat frame (31) at a position above the inclined plate (47) by the rollers (20, 21);
In the state where the seat bracket (19) is held by the front lower position lock mechanism (35), the roller (20, 21) is supported by the vibration isolating member (45, 46), It is in a state away from (47).

  According to the first aspect of the invention, in the state where the seat bracket is held at the front lower position, the seat bracket whose rear end side is in the free end state is directly supported by the vibration isolating member. Although it can be simplified, the vibration transmitted to the seat can be suppressed and the driver's fatigue can be reduced. Further, a suspension having a similar structure can be used for a work vehicle not equipped with a rotating seat.

  According to the second aspect of the invention, when the seat bracket is held at the front lower position, the roller provided on the seat bracket is separated from the inclined plate, so that the rear end side of the seat bracket is easy and reliable. Thus, the vibration isolating member can be directly supported, and a space can be provided on the rear side of the seat by the inclined plate.

The perspective view which shows the state which the sheet | seat which concerns on embodiment of this invention faced the front. The side view which shows the support apparatus of the rotation sheet hold | maintained in the front lower position. The side view which shows the support apparatus in the state where the load is not acting on the rotation sheet. The side view which shows the support apparatus of the state which the load acted on the rotation sheet | seat. The perspective view which shows the structure of the support apparatus of a rotation sheet. The perspective view which shows the state which the sheet | seat faced back. The perspective view which shows the structure of the support apparatus of the rotation sheet hold | maintained in the rear upper position. The side view which shows the support apparatus of a sheet | seat and a rotation sheet | seat.

  Hereinafter, a support device for a rotating sheet according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 6, the tractor 1 is provided with a driving operation unit 2 having a seat 3 on which a driver is seated. Side panels on which various operation levers such as PTO operation levers 5 and 6, a position control lever 7, and a tilling depth setting lever (PAC lever) 9 are arranged are provided on the left and right sides of the sheet 3. A roll bar 10 extends so as to surround the upper side. Further, as shown in FIGS. 2, 3, and 4, the seat 3 is provided with a seat belt 11 for fixing the driver to the seat 3.

  As shown in FIGS. 3, 4, and 8, the seat 3 is supported by a turntable (base) 16 via a seat rail 12, and the turntable 16 is attached to the fixed plate 15 and the fixed plate 15. The rotating plate 13 is rotatably connected, and is configured such that the sheet 3 rotates as the rotating plate 13 rotates. Further, the rotary plate 13 disposed on the upper side is provided with a sheet rotation lever 13a so as to protrude toward the side, and the turntable 16 for rotatably supporting the sheet 3 supports the rotary sheet. It is supported by a device (hereinafter simply referred to as a support device) 17.

  As shown in FIGS. 5 and 7, the support device 17 includes a seat bracket 19 that supports the turntable 16. The seat bracket 19 includes angle members (hereinafter referred to as bracket angles) 19L and 19R disposed on the left and right sides, and connecting plates 19F and 19B that connect the front and rear ends of the left and right bracket angles 19L and 19R. It is formed in a frame shape.

  The connecting plate 19 </ b> B that is the rear end portion of the seat bracket 19 is provided with two left and right brackets 22 and 23, and the brackets 22 and 23 support the roller shaft 25. The roller shaft 25 supports the two rollers 20 and 21 rotatably, and the rollers 20 and 21 are formed of rubber which is an elastic body. On the front end side of the bracket angles 19L and 19R, which is the front end side of the seat bracket 19, a joining shaft 29 is provided in parallel with the connecting plate 19F.

  On the other hand, a seat frame 31 is fixed to the vehicle body 33 side of the tractor 1 covered with the driver's seat exterior cover 28, and the seat frame 31 includes angle members (hereinafter referred to as frame angles) 31L and 31R arranged on the left and right sides, The connecting plate 31M connects the frame angles 31L and 31R. The upper and lower arms 26 and 27 are disposed with the upper end rotatably connected to the joint shaft 29 and the lower end rotatably supported by the frame angles 31L and 31R. The left and right arms 26 and 27 serve as a seat frame. 31, the front end of the seat bracket 19 is supported so as to be rotatable in the front-rear direction. A pipe member (hereinafter referred to as an arm pipe) 30 is installed between the left and right arms 26 and 27.

  A lock lever shaft 32 is provided on the front end side of the frame angles 31L and 31R, which is the front end side of the seat frame 31, and the seat bracket 19 is fixed to the seat frame 31 at a substantially central portion of the lock lever shaft 32. A front lower position locking mechanism 35 is provided.

  As shown in FIGS. 5 and 7, the front lower position locking mechanism 35 includes left and right flanges (hereinafter referred to as front flanges) 36 and 37 that engage with the arm pipe 30, and the front flanges 36 and 37. Has a forelock unlocking lever 39 for rotating the. One end of a lock lever return spring 40 is attached to each front flange portion 36, 37, and the other end of the lock lever return spring 40 is a pipe member (between the left and right frame angles 31L, 31R). (Hereinafter referred to as a first frame pipe) 41. The front flange portions 36 and 37 are urged toward the first frame pipe by the urging force of the lock lever return spring 40.

  A pipe member (hereinafter referred to as a second frame pipe) 42 is installed in parallel with the first frame pipe 41 behind the first frame pipe 41 and between the left and right frame angles 31L and 31R. One end of a seat raising spring 43 is attached to the left and right ends of the second frame pipe 42, and the other end of the seat raising spring 43 is attached to the arm pipe 30. The arm pipe 30 is biased toward the second frame pipe 42 by the biasing force of the seat raising spring 43.

  The coupling plate 31M disposed behind the second frame pipe 42 is provided with springs 45 and 46 that are vibration isolation members on the left and right sides, and the springs 45 and 46 are held at the front lower position. The suspension is configured. Further, rubbers 45a and 46a, which are elastic bodies, are attached to the upper ends of the springs 45 and 46, respectively.

  At the rear ends of the frame angles 31L and 31R, which are the rear ends of the seat frames 31 and behind the springs 45 and 46, an inclined plate 47 that is inclined obliquely upward is provided. A slit 49 is provided in the center of the inclined plate 47 from the lower end to the upper end. Further, one end of a support arm 50 that is an overturn prevention member is connected to the roller shaft 25 through the slit 49, and the other end of the support arm 50 prevents the support arm 50 from coming out of the slit 49. For this purpose, a pin 51 member is provided.

  Further, as shown in FIGS. 5 and 7, the upper position of the inclined plate 47 is bent in the horizontal direction to form a support portion 52 that supports the rollers 20 and 21. At both front and rear ends of the support portion 52, pipe members 53 and 55 for holding the rollers 20 and 21 are provided in an upper position after the support portion 52 supports the rollers 20 and 21.

  The inclined plate 47 is provided with a rear upper position locking mechanism 56 for fixing the seat bracket 19 to the inclined plate 47 (see FIGS. 4 and 5). The rear upper position locking mechanism 56 disengages the left and right collar portions (hereinafter referred to as rear collar portions) 57 and 59 that engage with the roller shaft 25 and the roller shaft 25 of the rear collar portions 57 and 59. A rear heel lock release lever 60 is provided.

  Next, the operation of the support device 17 configured as described above will be described. During the operation of the tractor 1 such as traveling and tilling, the seat 3 is in a front lower position facing forward. In the front lower position, the left and right arms 26 and 27 of the support device 17 are tilted forward (see FIG. 3), and the arm pipe 30 and the front flange portions 36 and 37 are engaged to form a seat bracket. The front end side of 19 is in a state of being pivotally supported by the seat frame 31 with the joint shaft 29 as a pivot.

  The turntable 16 supported by the seat bracket 19 is in contact with the rubbers 45a and 46a, and the turntable 16 and the seat bracket 19 are supported by left and right springs 45 and 46. The rollers 20 and 21 are located below the inclined plate 47 and away from the inclined plate 47, and the rear end side of the seat bracket 19 is in a free end state.

  When the driver performs work on a backhoe (not shown) attached to the rear part of the aircraft, the tractor 1 is stopped at the work position, and then the backhoe is operated facing back. At this time, the driver reverses the seat and turns it to the rear upper position.

  Then, the driver operates the front lock release lever 39 in order to reverse the seat 3. As the front hook lock release lever 39 is operated, the left and right front hook portions 36 and 37 rotate, and the engagement between the front hook portions 36 and 37 and the arm pipe 30 is released. When the engagement with the front flange portions 36 and 37 is released, the arm pipe 30 moves toward the second frame pipe 42 by the urging force of the seat raising spring 43. As the arm pipe 30 moves, the left and right arms 26 and 27 rise upward, and the rollers 20 and 21 move from the front lower position, which is the lower position of the inclined plate 47, to the upper position of the inclined plate 47. Move on the inclined plate 47. At this time, the support arm 50 moves upward in the slit 49 as the rollers 20 and 21 move.

  When the rollers 20 and 21 move to the support portion 52, the roller shaft 25 engages with the left and right rear flange portions 57 and 59, the rollers 20 and 21 are supported by the support portion 52, and the seat bracket 19 It will be held in position. As shown in FIG. 7 and FIG. 8, the driver sets the seat bracket 19 at the rear upper position, and then reverses the seat 3 so that the seat 3 faces backward.

  When the tractor 1 is operated again after the end of the backhoe operation, the driver reverses the seat 3 in the working state to the front lower position.

  Then, the driver operates the rear saddle lock release lever 60 to invert the seat 3. As the rear hook lock release lever 60 is operated, the rear hook portions 57 and 59 rotate, the engagement between the rear hook portions 57 and 59 and the roller shaft 25 is released, and the rollers 20 and 21 are supported by the support portion 52. To move on the inclined plate 47 toward the lower position of the inclined plate 47. As the rollers 20 and 21 move, the left and right arms 26 and 27 tilt forward, and the seat bracket 19 descends while moving forward from the rear upper position. When the seat bracket 19 is lowered to the front lower position, the arm pipe 30 is engaged with the left and right front flange portions 36 and 37, and the seat bracket 19 is held at the seat front lower position. The driver reverses the seat 3 in a state where the seat bracket 19 is held at the front lower position so as to be in a traveling state.

  As described above, the arm pipe 30 is engaged with the front flange portions 36, 37, the front end side is pivotally supported by the seat frame 31, and the rear end side is supported by the seat bracket 19 in the free end state. Is directly supported by the springs 45 and 46, so that the structure of the suspension for supporting the seat 3 can be simplified, and vibration transmitted to the seat 3 can be suppressed by the springs 45 and 46 to reduce driver fatigue. it can.

  Further, since the suspension having the same structure can be used for the tractor 1 equipped with a non-rotating seat, for example, it is not necessary to design a new suspension, and the manufacturing cost can be reduced.

  Further, when the arm pipe 30 and the front flange portions 36 and 37 are engaged and the seat bracket 19 is held by the seat frame 31, the rollers 20 and 21 are separated from the inclined plate 47. The seat 3 can be directly supported by the springs 45 and 46 in a state where the rear end side is easy and reliable. Thereby, for example, the sitting comfort of the seat 3 can be improved.

  Further, since the inclined plate 47 is provided on the rear end side of the seat frame 31, a space can be provided behind the inclined plate 47. Thereby, for example, the space on the rear side of the seat 3 can be used such as providing a hydraulic case (not shown) behind the inclined plate 47.

  In the present embodiment, the springs 45 and 46 are arranged on the connecting plate 31M so that the rubbers 45a and 46a provided on the springs 45 and 46 are in contact with the turntable 16. However, the present invention is not limited to this. The structure may be such that the springs 45 and 46 are disposed on the base 16 and the rubbers 45a and 46a abut against the connecting plate 31a.

3 Seat 17 Rotating Seat Support Device 19 Seat Bracket 20, 21 Roller 26, 27 Arm 31 Seat Frame 33 Car Body 35 Front Lower Position Locking Mechanism 45, 46 Vibration Isolation Member (Spring)
47 Inclined plate 56 Rear upper position lock mechanism

Claims (2)

In a rotating seat support device that supports a seat so as to be able to rotate forward and backward and move between a front lower position and a rear upper position with respect to the vehicle body,
A seat bracket for mounting the seat;
A seat frame fixed to the vehicle body side;
Left and right arms whose lower end is rotatably connected to the front end side of the seat frame and whose upper end is rotatably connected to the front end side of the seat bracket;
An anti-vibration member disposed on one of the seat frame and the base to which the seat is attached and in contact with the other in a locked state at the front lower position;
A front lower position locking mechanism capable of fixing the seat bracket to the seat frame at a position where the left and right arms are tilted forward;
When the seat bracket is held by the front lower position lock mechanism, the seat bracket is pivotally supported at the front end side with respect to the seat frame, the rear end side is in a free end state, and the vibration isolation Supported by a member,
A support device for a rotating sheet. An inclined plate provided on the rear end side of the seat frame and inclined obliquely upward toward the rear;
A roller disposed at a rear end of the seat bracket and capable of moving on the inclined plate;
A rear upper position locking mechanism capable of fixing the seat bracket to the seat frame at an upper position of the inclined plate;
In a state where the seat bracket is held by the front lower position lock mechanism, the seat bracket is supported by the vibration isolation member, and the roller is separated from the inclined plate.
The rotating sheet supporting device according to claim 1.

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