JPH06219193A - Vehicle seat reversing-supporting device - Google Patents

Abstract

(57) [Summary] [Structure] A support base 15 is connected to a fixed base 14 via a parallel link 11, a swivel base 18 is rotatably mounted on the support base 15, and the seat 4 is mounted on the swivel base 18. A biasing means 16 for biasing the other end of the parallel link 11 upward is provided between the mounting and fixed side and the parallel link 11, and is unlocked by operating the operation handle 29 to lock the swivel base 18 back and forth. 27 is provided. A lock member 31 that engages with an engagement portion 40 provided on the support base 15 to restrict the rotation of the swivel base 18 is fixed to one end of the operation handle 29, and the front and rear support shafts 17 are engaged with the parallel link 11. A regulation member 33 that regulates the upward rotation is provided, and an interlocking unit 34 that engages and disengages the regulation member 33 and the parallel link 11 is provided. [Effect] By simply operating the operation handle, the seat can be prevented from rotating and the seat can be prevented from rising, and the posture of the seat can be easily changed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat reversing support device used in, for example, a tractor loader backhoe (TLB).

[0002]

2. Description of the Related Art According to a conventional TLB, therefore, a seat on which a driver is seated is fixed to the vehicle body in order to change the seat to a forward posture for tractor traveling and loader work and a rearward posture for backhoe work. Each end of a pair of front and rear parallel links is pivotally supported by a fixed base via a horizontal axis, and a support base is connected to each other end of the front and rear parallel links via a support shaft. The seat is attached to the swivel base so as to be rotatable around the center, and a biasing means for biasing the other end of the parallel link upward is provided between the fixed side and the parallel link.

In this seat, it is necessary to prevent rotation and limit height, and a lock pin can be moved up and down by an operation lever supported on the support base, and this lock pin is used as a support base and a swivel base. To prevent the swivel from rotating by fixing it through, and to pivotally support a hook that is swung by the operation handle on the support, and engage this hook with the parallel link or the engaging portion provided on the fixed base. As a result, the seat is prevented from rising and the height of the swivel base is limited (see, for example, Japanese Patent Laid-Open No. 4-254625).

[0004]

However, in the above-mentioned prior art, since the rotation of the seat and the height limitation are performed by separate mechanisms, the operation of changing the posture of the seat is complicated and inconvenient. Therefore, an object of the present invention is to provide a reversing support device for a vehicle seat that can simultaneously prevent the seat from rotating and limit the height by operating the operation handle.

[0005]

In order to achieve the above object, the present invention takes the following means. That is, the feature of the present invention is that one end of each of the pair of front and rear parallel links 11F and 11R is pivotally supported by the fixed base 14 fixed to the vehicle body 1 side through the horizontal shaft 22, and the front and rear parallel links 11F and 11R are connected. A support base 15 is connected to each of the other ends via a support shaft 17, and a swivel base 18 is supported on the support base 15 so as to be rotatable about the vertical axis.
The seat 4 is mounted on the swivel base 18, and a biasing means 16 for biasing the other end of the parallel link 11 upward is provided between the fixed side and the parallel link 11, and the swivel base is released by operating the operation handle 29. In the vehicle seat reversing support device having the lock means 27 for setting the position 18 to the front and the rear, the one end of the operation handle 29 of the lock means 27 is engaged with the engaging portion 40 provided on the support base 15. A lock member 31 for restricting the rotation of the swivel base 18 is fixed, and the parallel link 1 is axially moved to one of the front and rear support shafts 17.
1 is provided to restrict the upward rotation of the locking member 31. The restriction member 3 is provided between the lock member 31 and the restriction member 33 in association with the engagement / disengagement of the lock member 31 and the engaging portion 40.
The interlocking means 34 for engaging and disengaging the 3 and the parallel link 11 is provided.

[0006]

When the seat 4 is in the forward-facing posture A, the rear horizontal axis 2
The arm 25 of the rear parallel link 11R projecting downward from 2R is biased forward by the tension spring 16 locked to the front horizontal shaft 22F for the front parallel link 11F, and biases the parallel link 11 upward. , Play a suspension effect.

When the operating handle 29 is pulled to the front, the locking means 27 is released and the height limiting means 28 is released at the same time. That is, the lock member 31 is disengaged from the engaging portion 40, the swivel base 18 becomes rotatable about the vertical axis with respect to the support base 15, and the parallel link 1 is moved by the interlocking means 34.
1 disengages from the regulation member 33, and the parallel link 11 can rise.

The parallel link 11 is started up and the sheet 4 is moved to 1
When the lock member 31 is engaged with the engaging portion 40 by rotating it by 80 degrees, the swivel base 18 is locked so as not to be rotatable with respect to the support base 15, and the restricting member 33 engages with the parallel link 11 by the interlocking means 34. Together, the upward movement of the parallel link 11 is restricted, and the posture B becomes rearward.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 9 shows the whole of a tractor loader backhoe (TLB) in which a front loader 2 and a backhoe 3 are mounted on a tractor body 1, and a driver's seat 4 is used when the tractor travels on the road and when working on the front loader. The posture can be changed between a forward posture A and a rearward posture B used during the work of the Bach.

Reference numeral 5 denotes a transmission case forming the rear part of the vehicle body 1, a rear axle case 6 is attached to the rear side of the transmission case, and a hydraulic device 7 for raising and lowering the working machine used when the backhoe is not used is mounted on the upper side of the rear case. Is installed. 1 to 8, the seat 4 has a seat reversing support device 1 having a parallel link 11 on a floor seat 8 covering a hydraulic device 7.
It is attached via 3. 14 is a fixed base, and there are a pair of front and rear parallel links 11, one end of each of which is a front and rear horizontal axis 22F,
It is pivotally connected via 2R, front and rear parallel links 11F, 1
A support base 15 is connected to each of the other ends of the 1R via front and rear support shafts 17F and 17R, and the rear parallel link 11R and the fixed base 14 are connected.
And are urged in the standing direction by a tension spring (urging means) 16 provided therebetween.

The front and rear parallel links 11F and 11R are each formed of two right and left sides, and the rear parallel link 11R has an arm 25 projecting downward, and a fixed shaft 25a fixed to this arm 25 and a front horizontal shaft 22F. Between the tension spring 16
Is stretched. Reference numeral 18 is a swivel base, and a circular opening 19 is formed in the center, and a ring-shaped slide guide 15a fixed to the upper surface of the support base 15 and having a thickness lower than that of the swivel base 18 is fitted into the opening 19. The swivel base 18 is mounted on the support base 15 so as to be rotatable about the vertical axis.

A pair of left and right guide rails 20 are fixed on the swivel base 18, and the sliding plate 2 is attached to the left and right guide rails 20.
1 is provided so as to be slidable forward and backward, the front portion of the sliding plate 21 is pivotally connected to the front portion of the seat 4 via a pivot 24, and the rear portion of the sliding plate 21 receives the rear portion of the seat 4. Cushion 2
3 is provided. By rotating the seat 4 around the pivot 24, the swivel base 18 can be exposed.

Between the support base 15 and the swivel base 18,
Locking means 27 for positioning at a position rotated by 180 °
However, height limiting means 28 are provided between the support base 15 and the parallel links 11, respectively. The locking means 27
Has an operation handle 29 supported by the swivel base 18. The operation handle 29 is inserted into an insertion hole of a mounting member 30 fixed to the swivel base 18 and is slidable in the horizontal direction. A block-shaped lock member 31 is fixed to one end of the operation handle 29 by a knock pin, and the operation handle 29 between the attachment member 30 and the lock member 31 urges the lock member to the opposite side to the attachment member 30. The spring 26 is fitted.

The slide guide 15a of the support base 15 is also provided.
At the upper part, an engaging disc 38 is fixed to a bolt 36 fixed to the support base 15 via a spacer 37 with a nut 39, and the outer diameter of the engaging disc 38 is the slide guide 15.
The outer diameter of the engaging disk 38a is set to be larger than the outer diameter of the locking member 31 to prevent the swivel base 18 mounted on the support base 15 from slipping upward, and the outer edge 38a of the engaging disk slides on the lock member 31 when swiveling. Has become. Further, the engaging disc outer edge portion 38
Two engaging portions 40, 40 with which the lock member 31 is engaged are provided at a position displaced by 180 ° from a, and when the lock member 31 engages with the engaging portion 40, the swivel base 18 is provided.
The rotation of is regulated. It should be noted that guide plates 41, 41 are fixed to the left and right of the lock member 31 to regulate the positional deviation in the left-right direction.

Thus, when the operation handle 29 is pulled toward the front against the spring 26, the lock member 31 is disengaged from the engaging portion 40, and when the swivel base 18 is slightly rotated and returned to the operation handle, the lock member 31 is released. Engaging disc outer edge 38
When the swivel base 18 is further rotated in this state, the lock member 31 engages with the engaging portion 40 and the swivel base 18 is fixed forward or backward.

The height limiting means 28 is a rear parallel link 11R.
A protrusion-shaped engaging portion 32 provided on the upper end of the, and a restricting member 33 that engages with the protrusion-shaped engaging portion 32 in a disengageable manner. The projecting engagement portion 32 is provided on the cylindrical block 11A fixed to the upper end of the rear parallel link 11R so as to project outward in the axial direction. Further, the regulation member 33 is formed by vertically fixing two flat plate members 33B and 33C to a boss 33A fitted to the rear support shaft 17R, and the upper plate member 33B has an upper surface 33a sliding on the lower surface of the support base 15. It freely abuts and is adapted to move linearly in the axial direction without rotating, and the lower surface b is caused to project linearly in this direction by the linear movement.
Engage with. By engaging the lower surface 33b with the protrusion-shaped engaging portion 32, upward rotation of the parallel link 11 above a certain level is regulated so as to be vertical. Height limiting means 28
Functions to prevent the seat 4 from rising when the seat 4 is facing forward or backward. A horizontal rod 43 protruding forward is fixed to the lower surface of the lower flat plate member 33C,
In addition, the other rear parallel link 11 that does not have a protruding engagement portion
A push spring 35 is fitted on the rear support shaft 17R between the R and the restriction member 33 to urge the restriction member 33 toward the protruding engagement portion side. In addition, 42 is a color.

Interlocking means 34 is provided between the locking means 27 and the height limiting means 28. Interlocking means 34
Is a stepped piece 44 fixed to the lock member 31, a center pin 45 slidably movable in the vertical direction by the stepped piece 44, and the regulating member 3 by the center pin 45.
3 has an interlocking portion 46 for engaging and disengaging the protruding engagement portion 32.

The center pin 45 is vertically slidably fitted in a support cylinder 47 fixed to the center of the support base 15 in a penetrating manner, and its upper portion abuts the stepped piece 44. The support cylinder 4
Reference numeral 7 penetrates through a through hole 38a provided in the center of the engagement disk 38 and projects upward. Stepped piece 44 is 2 in the center
It has a stepped portion 48 formed by being bent in a place, the lock member 31 is fixed to one end on the upper side, and a slit 49 is provided on the other end on the lower side. A support boss 50 is planted in the swivel base 18 at a position corresponding to the slit 49, and the lower side of the stepped piece 44 is placed on the swivel base 18. A small diameter longer than the thickness of the stepped piece 44 is provided above the support boss 50. The portion 50a is provided and the slit 49 is fitted therein. Then, a bolt 51 via a flat washer 52 is fixed to the small-diameter portion 50a to regulate the upward movement of the stepped piece and enable horizontal movement.

The interlocking portion 46 has two support plates 54 attached to the support base 15, and an operation rod 55 is supported on the support plates 54 so as to be rotatable in the horizontal direction. A horizontal plate 56 is fixed to one end of the operation rod 55, and a vertical rod 57 is fixed to the other end. The lower end of the center pin 45 is in contact with the horizontal plate 56, and the horizontal rod 43 of the regulating member 33 is in contact with the vertical rod 57.

As a result, when the stepped piece 44 is moved forward (in the direction of arrow A in FIG. 1), the center pin 45 moves downward and the horizontal plate 56 rotates about the axis of the operating rod 55. The vertical rod 57 also rotates around the axis of the operation rod 55. Due to the rotation of the vertical rod 57, the horizontal rod 43 of the regulating member 33 is pushed toward the rear parallel link 11R side that does not have the protruding engagement portion 32, and the upper flat plate member 33B and the protruding engagement portion 32.
Is disengaged. Further, when the stepped piece 44 is moved in the rearward direction (arrow B direction in FIG. 1), the center pin 45 is moved upward by the urging force of the spring 35 urging the regulating member 33 toward the protruding engagement portion 32 side. While moving, the upper flat plate material 33B engages with the protruding engagement portion 32.

In the state of the forward facing posture A shown by solid lines in FIGS. 2 and 5, the regulating member 33 engages with the engaging portion 32 and the front and rear parallel links 11F are urged by the tension spring 16 in the rising direction. The rise of 11R is restricted. When the operation handle 29 is pulled toward this side from this state, the lock member 31 is disengaged from the engaging portion 40 and the swivel base 1 with respect to the support base 15 is released.
The lock of 8 is released, the seat 4 becomes rotatable about the vertical axis, and at the same time, the restricting member 33 causes the protruding engagement portion 3 to move.
After separating from 2, the front and rear parallel links 11F and 11R can rise.

Then, after the parallel links 11F and 11R are tilted rearward, the seat 4 is rotated 180 ° to engage the lock member 31 with the engaging portion 40. Parallel link 1 in the backward facing posture B, as indicated by the dashed line
1 is in a state of restricting the upward swing. When the parallel link 11 is tilted from the front side to the rear side, the arm 25 passes over the center lines of the front and rear horizontal shafts 22F and 22R, at which time the tension spring 16 is in the neutral state.

Reference numeral 60 denotes a forward facing posture A and a backward facing posture B.
And a damper rubber 61 attached to a mounting plate 59 fixed to the upper ends of the pair of front parallel links 11F in a bridging manner.
1 has a push spring 62 fixed to the outside thereof, and the push spring 62 is covered with a spring cap 63. The damper member 60 abuts on the front mounting member 14a of the fixed base 14 when in the forward posture A, and in the backward posture B.
At this time, the bottom surface of the seat 4 is prevented from coming into contact with the back surface of the support base 15.

A stopper 64 for supporting the seat 4 in the rearward posture B is provided on the upper rear portion of the fixed base 14,
The rear parallel link 11R contacts the stopper 64. Further, when it is desired to change the height and position of the seat 4, it is possible to cope with the change in the mounting position of the stopper 64 or the length of the parallel link 11.

The present invention is not limited to the above embodiment, but can be variously modified. For example, the height of the slide guide 15a is made higher than the thickness of the swivel base 18,
It is also possible to lower only the portion of the engaging disc 38 corresponding to the engaging portion 40 and engage the lock member 31 as the engaging portion.

[0026]

According to the present invention described in detail above, one end of the operation handle 29 of the lock means 27 is engaged with the engaging portion 40 provided on the support base 15 to restrict the rotation of the swivel base 18. The lock member 31 is fixed, and one of the front and rear support shafts 17 is provided with a restricting member 33 that engages with the parallel link 11 by axial movement and restricts the upward rotation thereof. Between the lock member 31 and the engaging portion 4
Since the interlocking means 34 for engaging and disengaging the restricting member 33 and the parallel link 11 in association with the engagement and disengagement with 0, the seat 4 can be prevented from rotating and the seat 4 can be prevented from rising at the same time only by inserting and removing the lock member 31. The posture of the seat can be changed extremely easily.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional perspective view showing an embodiment of the present invention.

FIG. 2 is an overall side view.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view taken along line BB in FIG.

5 is a cross-sectional view taken along the line CC of FIG.

6 is a cross-sectional view taken along the line DD of FIG.

7 is a cross-sectional view taken along the line EE of FIG.

8 is a cross-sectional view taken along line FF of FIG.

FIG. 9 is an overall side view of the TLB.

[Explanation of symbols]

 1 tractor vehicle body 4 seat 11F front parallel link 11R rear parallel link 13 seat reversing support device 14 fixed base 15 support base 17 support shaft 18 swivel base 22 horizontal shaft 27 locking means 28 height limiting means 29 operation handle 31 locking member 33 restriction member 34 Interlocking means 40 Engaging part A Forward posture B Backward posture

Claims (1)

[Claims] 1. A fixed base (1) fixed to the vehicle body (1) side.
4) through a horizontal axis (22) to a pair of front and rear parallel links (1
1F) (11R) is pivotally supported at one end, and a support stand (15) is connected to the other ends of the front-rear parallel links (11F) (11R) via a support shaft (17). The swivel base (18) is rotatably supported on the vertical axis, and the seat (4) is mounted on the swivel base (18), and the parallel link (11) is provided between the fixed side and the parallel link (11). ) Is provided with an urging means (16) for urging the other end upward, and has lock means (27) which is released by the operation of the operation handle (29) and positions the swivel base (18) in the forward and backward directions. In the reversing support device for a vehicle seat, one end of an operating handle (29) of the locking means (27) is engaged with an engaging portion (40) provided on the support base (15) to turn the turntable (18). Lock member (3
1) is fixed, and a regulating member (33) for regulating the upward rotation of the front and rear support shafts (17) by engaging the parallel link (11) by axial movement is provided on one side of the lock member (31). ) And the regulating member (33) between the locking member (3
1) interlocking with engagement / disengagement of the engaging portion (40) with the regulating member (3
Interlocking means (3) for engaging and disengaging the parallel link (11) with the parallel link (3)
4) A reverse support device for a vehicle seat, which is provided with