JPH03178837A - Vehicle seat suspension device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a seat suspension device for a vehicle such as a tractor.

(Prior art) When working on a vehicle such as a tractor with a working machine such as a backhoe attached to the rear of the vehicle body, the regular driving seat provided on the vehicle body is reversed and used as a seat for the working machine. For example, see the specification and drawings of Japanese Patent Application No. 63-96494).

The conventional seat reversing device has a support base supported on the vehicle body via a parallel link mechanism that is swingable in the front-rear direction, a spring that biases the parallel link mechanism in the upright direction, and a support base supported vertically on the support base. A swivel base for supporting the seat that is rotatable around an axis, a locking means for locking the swivel base at a swivel position about the vertical axis, and an unlocking mechanism for unlocking the locking means when the parallel link mechanism is erected. The swivel base is provided with a retainer that removably engages with the parallel link mechanism to allow the seat to move up and down below a predetermined seat height, and the seat suspension spring is connected between the parallel link mechanism and the vehicle body. It was characterized by being attached to one side of the inside.

(Problems to be Solved by the Invention) The conventional sheet reversing device described above changes the direction of the sheet by 180° by raising parallel links.

That is, since fenders are arranged on both the left and right sides of the seat, even if an attempt is made to change the orientation of the seat by 180 degrees between the fenders, the corners of the seat will hit the fenders, making it impossible to reverse the seat.

Therefore, when reversing the vehicle, the seat is lifted above the fender so that the seat does not come into contact with the fender, and the seat is rotated at a position where it does not interfere with the fender.

Therefore, in order to lift the seat as high as possible,
The length of the parallel links must be increased.

However, if the length of the parallel link is increased, the distance between the forward position and the rearward position becomes too wide.

Therefore, the length of the parallel link must be determined in relation to the lifting height and the reversal position.

However, it has been difficult to satisfy both of these demands.

Therefore, the inventor of the present invention invented a sheet reversing device in which the lifting height and reversing position of the sheet can be set independently of each other.

However, in such a seat reversing device, it has been extremely difficult to decide what kind of structure the seat suspension device should have.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a seat suspension device for a seat reversing device in which the height of lifting the seat and the reversing position of the seat can be set independently of each other.

(Means for Solving the Problems) In order to achieve the above object, the present invention takes the following measures. That is, the vehicle seat suspension device of the present invention is characterized in that a post is provided on the vehicle body that is rotatable around a vertical axis, and a bracket that is rotatable around a horizontal axis is provided above the post. The bracket is provided with a rear spring for suspending the rear part of the seat, and a front spring is provided on the vehicle body for detachably supporting the front lower surface of the seat.

(Function) According to the present invention, in order to reverse the seat in the forward position to the rearward position, first, the bracket is rotated 90 degrees around the horizontal axis, and the seat supported by the bracket is rotated around the horizontal axis. lift to height. After that, the post is rotated 180 degrees, and then the bracket is rotated around the horizontal axis to place the seat in the rearward position.

According to the present invention, no matter how high the height of the post (the height of the horizontal axis) is, it does not affect the inverted position of the sheet.

Since the seat is only supported by the rear spring on the bracket, it does not interfere with the reversing operation.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.
FIG. 6 illustrates a case where the backhoe 2 is attached to the rear of the tractor body l.

In FIG. 6, a tractor body I has rear wheels 4 on both rear sides via a rear axle case 3, etc., and a rear wheel fender 5 is disposed inside the rear wheels 4. As shown in FIG.

Reference numeral 6 denotes a hydraulic system for raising and lowering the working machine, which is installed at the rear of the tractor body 1. On this hydraulic system 6, a reversing device 7 is used to reverse the seat 8 back and forth between the forward position 1YZF and the rearward position R. It is set freely. The seat 8 includes an L-shaped seat frame 9, a seat part 0, a backrest part 11, and a armrest part 12. The backhoe 2 is an example of a working machine, and includes a machine frame 13 and a boom (not shown), etc.
The machine frame 13 is detachably attached to the tractor body 1 from the rear via a mounting device 14. Further, on the machine frame 13, a stay/7'' 14a, a control/roll box 15, a control lever 16, etc. are provided.

The reversing device 7 for the sheet 8 is constructed as shown in FIGS. 1 to 5.

That is, in FIGS. 1 to 5, 17 is a base plate;
20 is a base 17 which is supported so as to be slidable back and forth on the hydraulic device 6 via a pair of left and right guide rails 18 and 19, and which can be locked at any position by a locking means (not shown).
This vertical shaft 2 is fixed to the top via the mounting plate 21.
A cylindrical post 22 is rotatably fitted into the shaft 0.

A bracket 23 is fixed to the upper end of the vertical shaft 2o, and has a pair of left and right boss portions 24 on the front side, into which a horizontal shaft 25 is rotatably inserted. A pair of irregularly shaped side plates 26 (left and right) are fitted onto both ends of the horizontal shaft 25, and the side plates 26 are fixed with bolts 27, and a lateral vibration prevention roller 28 is provided at the center of the horizontal shaft 25. It is fitted so that it can rotate freely.

The lateral vibration prevention roller 28 is fitted into a vertical groove 31 formed in a back plate 30 fixed to an upright portion 29 of the sheet frame 9, and is freely movable in the vertical direction within this groove 31. Each side plate 26 has a vertically elongated hole 32 formed at the lower front thereof.
The horizontal part 33 and the upright part 29 of the seat frame 9 are inserted into this elongated hole 32.
A fitting portion 35 of a protrusion shaft 34 whose connecting portion is fixed is inserted so as to be freely movable. A rear spring 36 is hung between the protrusion shaft 34 and the horizontal shaft 25 for urging the protrusion shaft 34 upward along the elongated hole 32. Note that there are a pair of left and right rear wings 36, and they are arranged inside the side plate 26. Further, the protrusion shaft 34 is fixed by a bolt 37 passing through in the left-right direction.

Reference numeral 38 denotes a front spring that supports the seat 8 in the forward position F, and is composed of a pair of left and right L-shaped spring rods 39;
9 is connected at the front end by a cylindrical body 40 in a planar U-shape, and at the rear end thereof is inserted into the r side of the mounting plate 21 on the base plate 17 and fixed with bolts 41. The front spring 38 is provided in a conical shape, and a bottom plate 42 provided on the horizontal portion 33 of the seat frame 9 is placed from above on a cylindrical body 40 at the front end thereof. 43 is cushion rubber. Reference numeral 44 denotes a rear support member that supports the seat 8 at the rearward position R. A support plate 46 is fixed to the upper end of a support arm 45 that projects diagonally rearward and upward from the base plate 17.
The bottom plate 42 of the seat frame 9 is placed on the upper cushion rubber 47. Note that the receiving plate 46 is higher than the supporting height of the front spring 38.

Reference numeral 48 denotes a seat locking means, which includes a holding cylinder 49 provided at the center of the front end of the bottom plate 42 of the horizontal portion 33 of the seat frame 9.
and a lock bin 5 inserted into the cylindrical body 49 so as to be slidable back and forth.
0 and a spring 51 that biases the lock bin 50 rearward, and the lock bin 50 is formed with a knob part 52 at the front end and an engaging part 53 at the rear end.

The engaging portion 53 of the lock pin 50 is supported and guided by a bracket 54 fixed to the bottom plate 42, and the seat 8
When it is in the forward position F, it engages with the cylindrical body 40 of the front spring 38, and when it is in the rearward position R, it engages with a locking part 55 fixed to the rear support member 44 in a freely engaging and detachable manner from below. It has become. In addition, when the seat 8 is rotated downward around the horizontal axis 6 of the protruding shaft 34, the retaining part 53 has a cylindrical body 40 and a locking part 55.
An inclined surface 56 is formed to allow the lock pin 50 to slide against the spring 51 in contact with the spring 51. Therefore, when the seat 8 is rotated from above downward about the axis of the protruding shaft 34, , the seat 8 can be locked by the seat locking means 48.

Reference numeral 57 denotes a post locking means for locking the post 22 to the vertical shaft 20 in a non-rotatable manner at the forward position F and rearward position R of the seat 8. This boss lock means 57 is
A hole 58 is provided in the upper part of the vertical shaft 20 to penetrate in the radial direction, and a cylindrical body 5 is fixed to the post 22 facing the hole 58.
9, and a lock bin 60 which is inserted into the cylindrical body 59 and can be freely engaged and detached from the hole 58, and a lock lever 61 is connected to the outer end of the lock bin 60. Lock lever 61
is provided extending upward from the lock pin 60, and its midway portion is pivotally supported by the support plate 23 by the pin 62, and the lock pin 60 is engaged with the hole 58 by a helical spring 63. It is strongly energized. A detection section 64 is provided at the upper end of the lock lever 61, and when the detection section 64 enters the groove 31 of the back plate 30 of the seat frame 9, the lock lever 61 swings against the spring 63. The lock bin 60 can be removed from the hole 58. Therefore, the post locking means 57 can automatically lock or release the post 22 by detecting the presence or absence of the upright portion 29 of the seat frame 9 using the detection section 64.

65 is a post positioning means, and a cylinder 66 is fixed to the post 22 at a position symmetrical to the cylinder 59 of the post locking means 57.
A ball 67 and a spring 68 are housed inside the pole 6.
7 is adapted to detachably engage with the hole 58 of the vertical shaft 20.

Reference numeral 69 denotes a side plate locking means for locking the seat 8 between the solid line position in FIG. 1 when the seat 8 is in the forward position F, and the rotated position rotated approximately 90 degrees clockwise from this position.

This side plate locking means 69 includes an engaging part 70 and an engaging part 71 formed at the peripheral edges of the pair of left and right side plates 26 at a distance of about 90 degrees.
and the engagement recess 72 and the engagement portion 70 of the left and right side plates 26
．． 71 or the engagement recess 72, and a horizontal engagement rod 73 that is disposed on both sides of the post 22 for support and pivoted to the bracket 75 of the post 22 by a pin 74. A pair of arms 76 on the right are supported, a detection section 77 is installed at the rear end of this arm 76, and an arc-shaped section attached to the mounting plate 21 behind the post 22 corresponds to the detection section 77. It consists of an operating section and a helical spring 79 that biases in the locking direction. Operation section 7
8 pushes the detection part 77 when the seat 8 is in the force forward position F and holds the engagement rod 7 in contact with the engagement part 70 or 71. Therefore, when the detection part 77 comes off, it is engaged. Rod 73
is adapted to engage with the engagement placement portion 72. Note that the spring 7 is wound around the pin 74.

Next, the operation in the above configuration will be explained.

The solid line in FIG. 1 shows the seat 8 in its normal forward position F. In this state, the post 22 is locked to the vertical shaft 20 by the boss locking means 57, and the side plate 26 is locked by the side plate locking means 69, so that it cannot rotate counterclockwise. Furthermore, the seat 8 is locked to the front spring 38 by seat locking means 48. If the operator sits on the seat 80 seat 10 in this state, the spring rod 39 of the front spring 38 and the rear spring 36 that biases the projection shaft 34 upward are deformed laterally, so that a sufficient cushioning effect is achieved. can get.

When reversing the seat 8 from the forward position F to the rearward position R, pull the knob 52 forward one by one to release the lock bin 50.
The retaining portion 53 is removed from the cylindrical body 4o of the front spring 38, and the seat 8 is unlocked by the seat locking means 48.

Next, when the front side of the seat 8 is lifted upward, the seat frame 9
Since the roller 28 is in contact with the upright portion 29 of the seat 8, the side plate 26 rotates clockwise around the horizontal axis 25 together with the seat 8. When the seat portion 10 of the seat 8 is rotated until it is in the upright state, the engaging portion 7o of the side plate locking means 69 engages with the engaging portion 71, so that rotation of the side plate 26 is restricted.

As a result, the sheet 8 changes from the state shown in FIG. 7 to the state shown in FIG. Then, the seat 8 is placed on the side plate 26 with the seat lo standing up, and is supported by the side plate 26 and the rollers 28. Further, the entire seat 8 is sufficiently raised as shown in FIG. 8 compared to the forward position F in FIG. 7.

On the other hand, in the state shown in FIG. 8, the upright portion 29 of the seat frame 9
4, the lock lever 61 swings around the pin 62 against the spring 63, and the lock pin 6o is removed from the hole 58 of the vertical shaft 20. In other words, the post 22 is unlocked by the post locking means 57. Therefore, sheet 8
If you hold a part of it and turn it to one side, the post 22 will align with the vertical axis 20.
The seat 8 rotates backwards while the seat 8 remains in a reclined position. Then, when the post 22 and the seat 8 turn <180 degrees as shown in FIG. 9, the positioning means 65 operates to position the post 22.

Furthermore, when the post 22 begins to rotate about the vertical axis 201, the detection part 77 of the side plate locking means 69 is disengaged from the operating part 78, so the arm 76 swings in the engagement direction (upward) by the spring 79, and the engagement occurs. The rod 73 slides from the engaging portion 71 into the engaging recess 72, and locks the side plate 26 unrotatably, as shown in FIG.

Once the state shown in FIG. 9 is reached in this manner, the seat 8 is then rotated rearward about the projection shaft 34 as shown in FIG. 10. Then, the horizontal portion 33 of the seat frame 9 moves to the rear support member 44.
At the same time, the lock pin 5o of the seat locking means 48 engages with the engaging portion 53 to lock the seat 8 onto the rear support member 44.

This completes the reversal of the seat 8 to the rearward position R.

In this way, the seat 8 can be reversed from the forward position F to the rearward position R by the rotational movement around the horizontal axis 25 and the protruding shaft 34, and the rotational movement around the vertical axis 20, so that handling at the time of reversal is easy. It's very easy. Furthermore, when the seat 8 turns around the vertical axis 20, it is located above the post 22 and is sufficiently lifted, so that a hydraulic lever and a change lever are nearby.
Even if there are levers such as, or rear wheel fender 5,
It can be reversed without interfering with them. Furthermore, since the seat 8 rests on the side plate 26 during turning, there is no need for the operator to hold the seat 8. Furthermore,
Since each locking means 48, 57, 69 is provided, the forward position F
, the seat 8 does not move unstably in the backward position R.

(Effects of the Invention) According to the present invention, in a sheet reversing device in which the sheet lifting height and the reversing position are in a mutually independent relationship, the front spring is separated from the sheet, so that the sheet can be easily reversed.

Furthermore, since the seat is supported by both the front and rear springs, excellent effects such as a stable suspension effect can be achieved.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which FIG. 1 is a cross-sectional side view of the main part, FIG. 2 is a plan view of the same, FIG. 3 is a rear view of the same, and FIG. 4 is a partially enlarged view of FIG. 1. FIG. 5 is a partially enlarged view of FIG. 2, FIG. 6 is a side view of the whole, and FIGS. 7 to 10 are explanatory views of the operation. DESCRIPTION OF SYMBOLS 1... Tractor body, 8... Seat, 20... Vertical shaft, 22... Post, 23... Bracket, 25...
... Horizontal axis, 36... Rear spring, 38... Front spring.

Claims (1)

[Claims] (1) A post is provided on the vehicle body that is rotatable around the vertical axis, a bracket is provided on the top of the post that is rotatable around the horizontal axis, and a rear spring that suspends and holds the rear part of the seat is attached to the bracket. A seat suspension device for a vehicle, characterized in that a front spring is provided on the vehicle body and detachably supports a front lower surface of the seat.