JP2007168659A - Seat device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure usage attitude that a back rest body is directed to a front side and is projected from a back rest mounting wall to an inner side in a left/right direction and to make the back rest to a shape along a seat mounting wall part regarding the back rest of an auxiliary seat device positioned at a left side of a driver's seat of a tractor and mounted to the seat mounting wall part in an inclination shape that it downward transfers as it advanced to a front side and in an inclination shape that it transfers to a left side as it advances to a front side. <P>SOLUTION: The back rest 26 is provided with a mounting bracket 64 for mounting the back rest body 63 to the back rest mounting wall 29, and the mounting bracket 64 supports the back rest body 63 such that a clearance of the back rest body 63 and the back rest mounting wall 29 is enlarged as it advances to a right side at usage attitude. The mounting bracket 64 is supported on the back rest mounting wall 29 turnably around an axis perpendicular to the back rest mounting wall 29 by a turning support shaft 72 provided at a position close to a left side of the back rest 26 such that a right side of the back rest 26 is downward moved. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a seat device including a backrest that can be changed between a use posture and a non-use posture by rotating.

In the tractor, an auxiliary seat device for sitting another person other than the driver may be provided in addition to the driver's seat where the driver sits (see Patent Documents 1 and 2).
This auxiliary seat device includes a seat portion for sitting and a backrest for leaning back.
Further, the auxiliary seat device is usually attached to the left wall portion of the driver's seat in the tractor.
US Pat. No. 6,142,572 US Pat. No. 5,777,649

By the way, in the auxiliary seat device, the seat and the backrest are attached so that the posture can be changed to a non-use posture so as not to get in the way of getting on and off, etc. when not in use, but it can be used by rotating the backrest of this auxiliary seat device It is considered to change the posture between a posture and a non-use posture.
In this case, the wall portion of the tractor to which the auxiliary seat device is attached is an inclined seat mounting wall portion that is inclined to move downward as it goes forward and that moves to the left and right direction outward as it goes forward. In an auxiliary seat device in which a backrest mounting wall for attaching a backrest is provided on a seat bracket that is attached to the wall, and the backrest is overlapped and attached to the backrest mounting wall, the backrest faces the front side and from the backrest mounting wall. If the posture is changed from the usage posture protruding inward in the left-right direction to a non-use posture by rotating it on the surface along the back of the backrest, the backrest retracts too much from the usage posture with respect to the seat mounting wall. In the non-use posture, the backrest protrudes from the seat mounting wall, and the backrest is obstructive. There is a problem in that that.

  Accordingly, the present invention is a seat device that is configured to change the posture between the use posture and the non-use posture by rotating the backrest, and in the use posture, the use posture of the backrest can be secured and the non-use posture. In this case, an object of the present invention is to provide a seat device that can be placed in a non-use posture in such a way that the backrest does not become an obstacle.

  The technical means taken by the present invention in order to solve the technical problem is a wall portion located on one side of the left and right sides of the driver seat of the tractor, and is inclined and moves forward as it goes forward. A seat bracket that is attached to an inclined seat mounting wall that shifts outward in the left-right direction as it goes, and a backrest that is attached to the backrest mounting wall of the seat bracket, the backrest comprising a backrest body and the backrest body A mounting bracket that is provided on the back side and is attached to a backrest mounting wall, and the mounting bracket has left and right in a use posture in which the backrest body faces the front side and protrudes inward in the left-right direction from the backrest mounting wall. Supports the backrest body so that the distance between the backrest body and the mounting surface of the backrest mounting wall increases as you go inward In addition, the mounting bracket is mounted on the backrest mounting wall around the axis perpendicular to the mounting surface so that the inner side of the backrest moves downward by a pivotal support shaft provided on the outer side of the backrest in the left-right direction. The backrest is supported so as to be rotatable, and the backrest is configured to be in a non-use posture by turning the backrest downward from the use posture around the rotation support shaft.

  In addition, the mounting bracket includes a mounting portion that is supported on the backrest mounting wall so as to be rotatable about the rotation support shaft, and the backrest mounting wall and the mounting portion of the mounting bracket are mounted on the back side in the use posture and the non-use posture. And a locking member that locks the backrest by engaging with a locking member provided on the front side of the mounted portion of the mounting bracket. The locking member is configured to engage the locking member with the locking member. It is preferable that an insertion portion through which the insertion portion is inserted is formed in the attached portion of the mounting bracket, and the insertion portion is constituted by an arc-shaped groove having the rotation support shaft as the center.

  According to the present invention, in the use posture in which the backrest body faces the front side and protrudes inward in the left-right direction from the backrest mounting wall, the distance between the backrest body and the mounting surface of the backrest mounting wall increases in the left-right direction. The mounting bracket supports the backrest body so as to expand, ensuring the use posture, so that the laterally inner side of the backrest mounting wall is separated from the backrest to the rear side, and the backrest mounting wall is seat mounting wall From this usage posture, the laterally inner side of the backrest moves downward with the pivotal support shaft provided near the laterally outward direction of the backrest as a fulcrum. By rotating the backrest around the axis perpendicular to the mounting surface of the backrest mounting wall so that the backrest is in a non-use posture, it is possible to obstruct getting on and off in the non-use posture. Backrest can be in the form along the seat mounting wall portion so as not et.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
8 to 10, reference numeral 1 denotes a cabin frame serving as a skeleton of a cabin mounted on a vehicle such as a tractor. The cabin frame 1 is configured as follows.
The cabin frame 1 includes a pair of left and right front struts 2, a pair of left and right rear struts 3, and a pair of left and right intermediate struts 4 positioned between the left and right front struts 2 and the left and right rear struts 3. The upper portions of the left and right rear struts 3 and the left and right intermediate struts 4 are located at substantially the same height as the upper portions of the left and right front struts 2, and the lower end portions are located at the middle positions of the front struts 2 in the vertical direction.

  The upper parts of the front strut 2, the rear strut 3 and the intermediate strut 4 on the left and right sides are connected by a side upper frame member 5, and the upper ends of the left and right front struts 2 are connected by a front upper frame member 6, and the left and right rear struts 3 are connected by a rear upper frame member, the lower ends of the intermediate column 4 and the rear column 3 are connected by an intermediate frame member 8, and the lower ends of the rear column 3 are connected by a rear intermediate frame member 9. The lower ends of the left and right front columns 2 are connected by a lower front frame 10.

Further, a lower rear support column 11 extends from the left and right sides of the rear intermediate horizontal frame member 9 toward the front lower side, and the lower end of the left and lower lower rear support column 11 and the lower front frame 10 are disposed in the front-rear direction. The pair of side lower frame members 12 are connected, and the middle portions of the lower rear support column 11 are connected by a connecting frame member 13.
Further, the lower intermediate strut 14 extends from the lower end of each of the left and right intermediate struts 4 to the front lower side to the lower end position of the front strut 2. It is connected by the lower connecting frame material.

In the rear lower portions of the left and right side surfaces of the cabin frame 1 having the above-described configuration (on the rear side of the lower intermediate support column 14 and on the lower side of the intermediate frame member 8 and on the outer side in the left and right direction than the side lower frame member 12), A tire house forming member 16 that forms a rear wheel tire house (rear wheel housing space) is provided.
The tire house forming member 16 is made of a plate material, and is provided with a standing wall portion 17 extending upward from the lower side frame member 12, bent at the upper end of the standing wall portion 17, and extending from the upper end to the intermediate side frame member 8. The upper inclined wall portion 18 and the front inclined wall portion 19 which is bent from the front end of the standing wall portion 17 and is provided from the front end to the lower intermediate strut 14 are configured.

The upper end of the upright wall portion 17 is substantially parallel to the intermediate frame member 8, and the upper inclined wall portion 18 is formed to be inclined so as to move outward in the left-right direction as it goes upward, and the front end of the upright wall portion 17 is lower The front inclined wall portion 19 is substantially parallel to the intermediate strut 14 and has an inclined shape that moves downward as it goes forward and an inclined shape that moves outward in the left-right direction as it goes forward. An interior material is stretched on the cabin interior side of the house forming member 16.

A fender that covers the front side and the upper side of the rear wheel is attached to the intermediate frame member 8 and the lower intermediate support column 14.
Further, a floor sheet 20 constituting the cabin floor is provided on the lower surface side of the cabin frame 1, and the rear side of the floor sheet 20 is one step higher than the step portion 21 (foot rest portion) on the front side. A driver seat arrangement portion 22 formed high is provided, and a driver seat on which a driver is seated is provided in the driver seat arrangement portion 22.

Therefore, the tire house forming members 16 are located on both the left and right sides of the driver's seat.
The rear end side of the floor sheet 20 extends to the connecting frame member 13, and a window glass is fitted between the connecting frame member 13 and the rear intermediate horizontal frame member 9. A windshield is fitted, a door is fitted between the front column 2 and the intermediate column 4 and the lower intermediate column 14 so as to be openable and closable, and a side glass is fitted between the intermediate column 4 and the rear column 3, and left and right rear A rear glass is fitted between the columns 3, and a roof is provided on the upper surface side of the cabin frame 1.

An auxiliary seat device 23 is provided on the cabin interior side of the cabin frame 1 so that a person other than the driver can be seated.
The auxiliary seat device 23 is disposed on the front side (of the front inclined wall portion 19) of the tire house forming member 16 on the left side of the cabin interior side and is attached to the front inclined wall portion 19. The inclined wall portion 19 is a seat mounting wall portion 19 to which the auxiliary seat device 23 is attached.

As shown in FIGS. 1 to 7, the auxiliary seat device 23 includes a seat bracket 24 that is attached and fixed to the seat attachment wall portion 19 (cabin frame 1), and a seat portion that is attached to the seat bracket 24 for sitting. 25 and a backrest 26 for leaning against the back, and a seat support 27 for supporting the seat portion 25.
The seat bracket 24 is formed of a thick plate material, and includes a wall 28 to be attached to the seat attachment wall portion 19, a backrest attachment wall 29 to which the backrest 26 is attached, and a seatbelt attachment portion 30 to which the seatbelt device is attached. It has.

The mounted wall 28 of the seat bracket 24 is disposed opposite to (in parallel with) a predetermined distance on the front side of the seat mounting wall portion 19, and between the mounted wall 28 and the seat mounting wall portion 19, A cylindrical spacer member 31 having a screw hole inside is provided, and the spacer member 31 is fixed to the seat mounting wall portion 19 by welding or the like.
The spacer members 31 are provided on the upper side and the lower side of the mounted wall 28, and a pair of upper and lower spacer members 31 are further provided, and each spacer member 31 penetrates the mounted wall 28 from above. The mounting bolts 32 are screwed together, and thereby the seat support 27 is attached to the seat mounting wall portion 19.

The front side of the mounted wall 28 is a seat mounting surface 33 for mounting the seat 25, and the seat support 27 is also mounted on the seat mounting surface 33.
A seat mounting bracket 34 for mounting the seat 25 is mounted on the upper side of the seat mounting surface 33, and this seat mounting bracket 34 is fastened together with an upper mounting bolt 32 for mounting and fixing the seat bracket 24. Attached to the seat bracket 24.

The seat mounting bracket 34 includes a mounted wall 35 that is mounted on the seat mounting surface 33, and a support wall 36 that extends from the left and right sides of the mounted wall 35 in a direction perpendicular to the seat mounting surface 33. Has been.
On the other hand, the seat portion 25 is composed of a substrate 37 and a seat body 38, and the seat body 38 is formed by embedding a core material 40 made of a plate material on the lower surface side in the cushion 39. The seat body 38 is attached to the substrate 37 by bolting to the upper surface side of the substrate 37.

  A pair of left and right mounting pieces 41 disposed on the inner side of the support wall 36 of the seat mounting bracket 34 is fixed to the rear side of the lower surface of the substrate 37, and a pivot 42 that penetrates the left and right mounting pieces 41 and the left and right support walls 36. Thus, the seat portion 25 is attached to the seat portion mounting bracket 34 (seat portion mounting surface 33) so as to be swingable up and down around an axis in the direction along the seat mounting wall portion 19 with respect to the left-right direction. By swinging up and down around 42, the seat 25 is substantially horizontal (opposite) with respect to the use posture shown in FIG. 2 and the seat mounting surface 33 (seat mounting wall 19). The posture can be changed to the non-use posture shown in FIG.

Further, a guide plate 43 is fixed to the center in the left-right direction on the front side of the lower surface side of the seat portion 25 (the lower surface side of the substrate 37).
The guide plate 43 will be described in a state in which the seat portion 25 is in the use posture. The guide plate 43 is disposed such that the thickness direction is along the front surface of the seat mounting wall portion 19, and the front-rear direction In this guide plate 43, a guide groove 44 is formed in a penetrating manner in the plate thickness direction.

The guide groove 44 is composed of a straight groove portion 45 formed linearly in the longitudinal direction of the guide plate 43 and an inclined groove portion 46 formed so as to extend rearward and upward from the rear end side of the linear groove portion 45. .
Further, a locking hole 47 (locking portion) is formed in the left-right direction through the rear side of the inclined groove portion 46 on the rear end side of the guide plate 43, and the left side of the locking hole 47 faces the left side. It is formed in the taper shape which expands in diameter.

A support mounting bracket 48 for mounting the seat support 27 is mounted on the lower side of the seat mounting surface 33, and the support mounting bracket 48 is fastened together with a lower mounting bolt 32 for mounting and fixing the seat bracket 24 to be seated. Attached to the bracket 24.
The support mounting bracket 48 includes a mounted wall 49 that is mounted on the seat mounting surface 33, and a support wall 50 that extends from the left and right sides of the mounted wall 49 in a direction orthogonal to the seat mounting surface 33. A support shaft 51 having an axis parallel to the axis of the pivot 42 is provided across the left and right support walls 50.

  On the other hand, the seat support 27 has a first arm portion 52 having one end side pivotally connected to a support wall 50 on the right side of the support mounting bracket 48 via the support shaft 51 so as to be rotatable about the axis of the support shaft 51. An engaging portion 53 that extends leftward from the other end side of the first arm portion 52 and passes through (engages with) the guide groove 44 orthogonally, and one end side on the left side of the support mounting bracket 48 A second arm portion 54 pivotally connected to the support wall 50 via the support shaft 51 so as to be rotatable about the axis of the support shaft 51, the other end side of the second arm portion 54, and the engagement. A support cylinder 55 is fixed to the left end side of the joint portion 53 and has an axis parallel to the engaging portion 53, and a lock member 56 is inserted through the support cylinder 55 so as to be movable in the axial direction.

The first arm portion 52 and the engaging portion 53 are formed by bending a bar, and the support main body 57 is configured by the first arm portion 52 and the engaging portion 53.
The lock member 56 is formed of a round bar, and a grip 58 is attached to the left end side, and a spring receiving member 82 provided in a fixed manner between the right end side of the lock member 56 and the support tube 55. A spring member 60 made of a compression coil spring fitted to the lock member 56 is interposed between the support member 55 and the support cylinder 55, and the lock member 56 is urged toward the right side by the spring member 60 to lock the lock member 56. A stopper 61 made of a retaining ring provided between the grip 58 and the support cylinder 55 of the member 56 comes into contact with the support cylinder 55 so that the lock member 56 is biased to the right side by the urging force of the spring member 59. Movement is restricted.

In a state where the stopper 61 is in contact with the support cylinder 55, the right end side of the lock member 56 can be inserted through the locking hole 47 or the guide groove 44, and resists the biasing force of the spring member 60. Thus, by moving the lock member 56 to the left side, the right end side of the lock member 56 can be removed from the locking hole 47 or the guide groove 44.
The axis of the lock member 56 is parallel to the axis of the engaging portion 53, the second arm portion 54 is formed of a bar, and the extension line of the axis of the second arm portion 54 is the lock member 56. And the axis of the engaging portion 53 are orthogonal to each other.

With the above-described configuration, the seat portion 25 can be folded so as not to be an obstacle when the driver is not in use, such as when a person other than the driver is not on or when the driver gets on and off.
That is, when in the use posture, as shown in FIG. 2, the seat portion 25 is in a substantially horizontal state (the seat surface faces upward), and the engaging portion 53 of the support body 57 is inclined by the guide groove 44. In this state, even if the support main body 57 tries to swing downward around the support shaft 51, the engaging body 53 contacts the front side of the inclined groove 46, so that the support main body 57 is on the lower side. Therefore, the seat portion 25 is supported by the seat support 27 and held in a use posture.

In this use posture, the axial center of the locking member 56 and the axial center of the locking hole 47 coincide with each other so that the locking member 56 can be inserted into the locking hole 47, and the locking member 56 is inserted into the locking hole 47. As a result, the seat portion 25 is locked in the use posture and does not accidentally swing to the non-use posture.
When the seat portion 25 is folded from the use posture to the non-use posture, the lock member 56 is removed from the locking hole 47 and the front end side of the seat portion 25 is slightly lifted in this state. Since a gap is formed between the front side and the engaging portion 53, the seat support 27 can swing downward around the support shaft 51.

  Then, when the seat support 27 is swung downward about the support shaft 51 and the engaging portion 53 is moved to the rear end side of the linear groove portion 45, the engaging portion 53 is relatively moved in the straight groove portion 45 toward the front end side. Since the seat portion 25 can swing downward around the pivot 42, the seat support 27 swings around the support shaft 51 and the engaging portion 53. Moves relative to the front end side in the straight groove 45, and the seat 25 is folded into a non-use posture as shown in FIG.

When the seat portion 25 is in a non-use posture, the lock member 56 can be inserted into the guide groove 44, and by inserting the lock member 56 into the guide groove 44, the vertical swinging of the seat portion 25 around the pivot 42 is restricted, It is possible to prevent the seat portion 25 from flapping by vibration or the like in a non-use posture.
When the posture is changed from the non-use posture to the use posture, the posture can be changed to the use posture by removing the lock member 56 from the guide groove 44 and swinging the seat portion 25 upward.

  Further, since the lock member 56 is urged by the spring member 60 in a direction to be inserted into the locking hole 47 or the guide groove 44, the hand is released from the grip 58 with the seat portion 25 slightly lowered from the use posture. When the pulling force from the locking hole 47 to the lock member 56 is released, the lock member 56 is urged by the spring member 60 and comes into contact with the side surface of the guide plate 43, and from this state, the seat portion 25 is brought into a non-use posture. When the rocking member 56 is swung, the distal end side of the locking member 56 slides on the side surface of the guide plate 43, and when the locking member 56 is positioned at a position where it can be inserted into the guide groove 44, the locking member 56 is moved by the urging force of the spring member 60. The guide groove 44 is automatically inserted.

  Further, even when the posture is changed from the non-use posture to the use posture, similarly, the hand is released from the grip 58 in a state where the seat portion 25 is slightly raised from the non-use posture and the guide groove 44 with respect to the lock member 56 is released. When the pulling force of the lock member 56 is released, the lock member 56 is urged by the spring member 60 and comes into contact with the side surface of the guide plate 43. When the seat portion 25 is swung from this state to the use posture, the lock member 56 When the distal end slides on the side surface of the guide plate 43 and the lock member 56 is positioned at a position where the lock member 56 can be inserted into the lock hole 47, the lock member 56 is automatically inserted into the lock hole 47 by the biasing force of the spring member 60. To do.

The seat belt mounting portions 30 are provided on both the left and right sides of the mounted wall 28 of the seat bracket 24. The right seat belt mounting portion 30 is provided with a webbing provided with a tongue plate, and the left seat belt mounting portion 30 is provided with a seat belt mounting portion 30. A buckle device for engaging the tongue plate is attached.
An extension wall 62 extending upward along the seat attachment wall portion 19 is provided on the upper end side of the seat bracket 24, and a backrest attachment wall 29 is provided on the upper end side of the extension wall 62.

The backrest mounting wall 29 is bent at the connecting portion with the extension wall 62 so as to go upward along the seat mounting wall portion 19 and thus gradually increase the distance from the seat mounting wall portion 19.
The backrest mounting wall 29 may be formed so as to extend substantially along the seat mounting wall portion 19 and thus substantially along the seat mounting wall portion 19.
The backrest mounting wall 29 is formed so as to substantially follow the seat mounting wall portion 19 in the left-right direction.

In the example shown in the figure, the backrest mounting wall 29 is slightly inclined with respect to the left and right direction with respect to the seat mounting wall portion 19 so as to be separated from the seat mounting wall portion 19 toward the front side as going inward in the left and right direction.
The backrest 26 mainly includes a backrest main body 63 and an attachment bracket 64 for attaching the backrest main body 63 to the seat attachment wall portion 19.

The backrest body 63 is formed by embedding a core material 66 made of a plate material on the back side in the cushion 65.
The mounting bracket 64 includes a support plate 67 that supports the backrest main body 63 and a mounting plate 68 that is mounted to the seat mounting wall portion 19.
The support plate 67 is made of a plate material and is superposed on the back surface of the backrest 26, and the backrest body 63 is mounted and supported on the mounting bracket 64 by bolting the core material 66 of the backrest body 63 to the support plate 67. .

The mounting plate 68 is made of a plate material and is disposed on the back side of the support plate 67. The mounting portion 69 is attached to the front surface side of the backrest mounting wall 29 and is mounted on the front side from the left and right sides of the mounting portion 69. And a pair of extending portions 70 </ b> L and 70 </ b> R whose front end side is fixed to the back surface of the support plate 67.
The front end side of the right extension portion 70R is fixed to the middle portion in the left-right direction of the support plate 67, and the left extension portion 70L is fixed to the left end side of the support plate 67, while the right extension portion 70 is fixed to the left side. As shown in FIG. 5, the mounting bracket 64 has a backrest body 63 facing the front side and a laterally inward side from the backrest mounting wall 29 as shown in FIG. 5. The backrest main body 63 is supported so that the distance between the backrest main body 63 and the mounting surface 71 (front surface) of the backrest mounting wall 29 increases as it goes inward in the left-right direction.

  As a result, the backrest mounting wall 29 is provided in a direction along the back surface of the backrest main body 63 in the use posture, and the backrest main body 63 is directly attached to the backrest mounting wall 29 (not via the mounting bracket 64). The right side of the backrest mounting wall 29 can be brought close to the seat mounting wall portion 19, and the backrest mounting wall 29 can be substantially along the seat mounting wall portion 19 in the left-right direction.

Further, the mounting bracket 64 is supported on the backrest mounting wall 29 via a pivotal support shaft 72 so as to be rotatable about an axis in a direction perpendicular to the mounting surface 71 of the backrest mounting wall 29.
The pivotal support shaft 72 is provided on the backside mounting wall 29 in the laterally outward direction and on the upper side (in the operating posture, in the laterally outward direction of the backrest main body 63 and in the middle in the vertical direction). In use, the backrest 26 is rotated by 90 ° so that the right side (inward in the left-right direction) of the backrest 26 moves downward around the rotation support shaft 72 from the use posture described above, so that the backrest 26 is shown in FIG. The posture can be changed to the non-use posture shown in FIG.

  In this non-use posture, the left extension portion 70L with a short extension length is located on the upper side, and the right extension portion 70R with a longer extension length is located on the lower side, and the backrest mounting wall 29 Is provided so as to be substantially along the seat mounting wall portion 19 in the left-right direction, so that the backrest mounting wall 29 goes upward along the seat mounting wall portion 19 so that the distance from the seat mounting wall portion 19 gradually increases. Even if it is provided, the backrest main body 63 is housed in a shape substantially along the front surface of the seat mounting wall portion 19 and can be retracted from the use position so that the backrest 26 does not get in the way when not in use.

  On the other hand, when the backrest mounting wall 29 is provided in a direction along the back surface of the backrest main body 63 in the use posture, and the backrest main body 63 is directly attached to the backrest mounting wall 29, the backrest relative to the seat mounting wall portion 19 is provided. In the non-use posture, the backrest 26 protrudes from the seat mounting wall portion 19, and the backrest 26 becomes an obstacle.

The auxiliary seat device 23 includes a lock mechanism 73 that locks the backrest 26 between a use posture and a non-use posture.
In the lock mechanism 73, the holding cylinder 74 provided on the upper right side of the backrest mounting wall 29, the lock member 75 inserted through the holding cylinder 74, and the lock member 75 are engaged in the use posture and the non-use posture. A pair of locking members 76, a spring 77 that urges the locking member 75 in a direction to engage the locking member 75, and a grip 78 for gripping the locking member 75 are provided.

The holding cylinder 74 has an axial center perpendicular to the back mounting wall 29, passes through the back mounting wall 29, has a front end side opened, and the front side is flush with the front side of the back mounting wall 29. In addition, it is provided as a protruding shape from the backrest mounting wall 29 to the rear side.
The lock member 75 is formed of a bar, and is inserted into the holding cylinder 74 so as to be movable in the axial direction, so that it can protrude forward from the holding cylinder 74.

Further, the lock member 75 penetrates the rear wall portion of the holding cylinder 74 and protrudes rearward. A grip 78 is screwed and fixed to the protruding portion, and a lock for fixing the grip 78 is provided. When the nut 79 contacts the back surface of the holding cylinder 74, the movement of the lock member 75 to the front side is restricted.
Further, an insertion portion 80 for projecting the front end side of the lock member 75 to the front side of the attachment portion 69 is formed in the attachment portion 69 of the attachment plate 68 in a penetrating manner in the plate thickness direction. The part 80 is configured by an arc-shaped groove centered on the axis of the rotation support shaft 72.

The spring 77 is a coil spring and is housed in the holding cylinder 74 and is fitted into the lock member 75, and is compressed between a spring receiving portion 81 provided on the lock member 75 and the rear end side wall portion of the holding cylinder 74. The lock member 75 is urged forward.
The locking member 76 is formed of a cylindrical body and is disposed on one end side and the other end side of the insertion portion 80, and its axis is located on the front surface side of the mounting portion 69 of the mounting plate 68. It is fixed so as to be orthogonal to the front side.

  When the backrest 26 is in the usage posture, the lock member 75 protrudes forward from the attached portion 69 of the mounting plate 68 through the insertion portion 80 and passes through one locking member 76 to use the backrest 26 in the usage posture. When the backrest 26 is in a non-use posture, the backrest protrudes from the mounted portion 69 of the mounting plate 68 to the front side through the insertion portion 80 and passes through the other locking member 76. 26 is locked in a non-use posture.

When the backrest 26 is changed from the use posture to the non-use posture, the grip 78 is gripped and the lock member 75 is moved backward against the urging force of the spring 77 to be detached from the locking member 76, and the backrest is in this state. 26 is rotated around the rotation support shaft 72 to be in a non-use posture, and the lock member 75 is inserted into the locking member 76 in this posture.
When changing from a non-use posture to a use posture, the operation opposite to this operation is performed.

  If the backrest 26 is only locked between the use posture and the non-use posture, the insertion portion 80 does not need to be formed in an arc-shaped groove with the rotation support shaft 72 as the center. When the backrest 26 is rotated, the lock member 75 is removed from the insertion portion 80 and the tip (front end) of the lock member 75 is attached to the mounting plate when the backrest 26 is rotated. The backrest 26 can be rotated even if the front end of the lock member 75 is located in the insertion portion 80, and the lock member 75 is removed from the locking member 76. At this time, the amount of backward movement of the lock member 75 can be reduced, which is convenient when the gap between the grip 78 and the seat mounting wall portion 19 is small, and the plate of the mounted portion 69 of the mounting plate 68 is convenient. Thickness You can gather the only backrest 26 to the seat mounting wall portion 19.

(A) is a side view of the auxiliary seat device as viewed from the direction along the seat mounting wall, and (b) is an arrow A view of (a). It is a side view which shows the use condition of a seat part. It is a side surface which shows the non-use state of a seat part. It is a plane enlarged view of a seat part. It is a top view which shows the use condition of a backrest. It is a side view which shows the non-use state of a backrest. It is an A figure shown by the arrow of FIG. It is a front view of a cabin frame. It is a side view of a cabin frame. It is a top view of a cabin frame.

Explanation of symbols

19 Seat mounting wall portion 24 Seat bracket 26 Backrest 29 Backrest mounting wall 63 Backrest main body 64 Mounting bracket 69 Mounted portion 71 Mounting surface 72 Rotating support shaft 76 Locking member 75 Locking member 80 Insertion portion

Claims (2)

  A wall portion (19) located on one side of the driver seat of the tractor, which is inclined so as to move downward as it goes forward, and inclined as shown in FIG. A seat bracket (24) attached to (19), and a backrest (26) attached to a backrest mounting wall (29) of the seat bracket (24), the backrest (26) including a backrest body (63) A mounting bracket (64) provided on the back side of the backrest main body (63) and attached to the backrest mounting wall (29), wherein the backrest main body (63) is on the front side. In a use posture that protrudes inward in the left-right direction from the backrest mounting wall (29), the backrest body (63) and back The backrest body (63) is supported so that the space between the leaning wall (29) and the mounting surface (71) is widened, and the mounting bracket (64) is supported by the backrest mounting wall (29) and the backrest (26). Of the backrest (26) is pivotable about an axis perpendicular to the mounting surface (71) so that the laterally inner side of the backrest (26) is moved downward by a pivotal support shaft (72) provided on the outer side in the lateral direction. The seat device is configured to support and to turn the backrest (26) into the non-use posture by rotating the backrest (26) downward from the use posture around the rotation support shaft (72). .   The mounting bracket (64) includes a mounted portion (69) that is supported by the backrest mounting wall (29) so as to be rotatable about the rotation support shaft (72), and the backrest mounting wall is used in a use posture and a non-use posture. (29) and a mounting portion (69) of the mounting bracket (64) that penetrates from the back side and engages with a locking member (76) provided on the front side of the mounting portion (69) of the mounting bracket (64). A locking member (75) that locks the backrest (26) by joining together is provided, and an insertion portion (80) through which the locking member (75) is inserted to engage the locking member (75) with the locking member (76). ) Is formed in the mounted portion (69) of the mounting bracket (64), and the insertion portion (80) is formed by an arc-shaped groove centered on the rotation support shaft (72). The sheet apparatus according to 1.

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