JPH0513809Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a seat device used in construction machinery vehicles such as motor graders.

(Prior Art) Conventionally, in a motor grader used for snow removal, etc., as shown in FIG. The seating part 12 and the backrest 13 are integrated by a fixing fitting 18, and the first
As shown in FIG. 3, a safety seat belt 14 is provided on the seating portion 12.

On the other hand, as shown in FIG. 14, in the motor grader, a main frame 15 largely protrudes forward from the cab 11 where the operator is located, and the main frame 15 is provided with a front wheel 16 and a blade 17, so that the operator can It may be difficult to secure forward visibility while sitting in the cab 11.

In such a case, the operator removes the safety seat belt 14 and operates the motor grader while standing up from the seat. The cab 11 is also made high upwards in consideration of such points, and the steering handle is also made so as to be adjustable fore-and-aft and vertical movement using an adjustable steering console.

However, when performing work such as trench digging, slope finishing, snow removal, etc. with the blade 17 standing perpendicular to the ground (bank cut position), the blade 17 may hit an obstacle or perform normal work. If the blade 17 hits a protrusion of a manhole cover on the road, the operator who is not wearing the safety seat belt 14 and is in a standing position may lean forward, and it is not possible to work in the conventional standing position. It was dangerous for the operator.

Furthermore, as shown in Japanese Utility Model Publication No. 60-3160, a suspension and a seat cushion (hereinafter referred to as the seating section) are moved up and down by a seat height adjustment device, and a back cushion (hereinafter referred to as A driver's seat for a motor grader is known in which a lever (referred to as a backrest) is moved back and forth, a parallel link is locked by a lever, and a seat height adjustment device is locked by another lever.

(Problems to be Solved by the Invention) The seat device described in this publication is not equipped with a safety seat belt and is dangerous to the operator as described above. In addition, when adjusting the height of the seat, the operator must stop the vehicle, step down from the seat, and handle the seat height adjustment device, making it easy to switch between sitting and standing positions. can't be done quickly.

SUMMARY OF THE INVENTION An object of the present invention is to provide a seat device for a construction machinery vehicle that allows the user to change the position from a seated position to a standing position, and vice versa, while wearing a safety seat belt.

[Structure of the idea]

(Means for Solving the Problems) The present invention provides a seat device facing a handle or the like of a construction machinery vehicle, which includes a backrest 23 that is provided so as to be able to rise forward with respect to a seating portion 21 of the device;
A safety seat belt 22 provided on the back rest 23 and movable together with the back rest 23;
3 is provided on both the left and right sides of the seating section 21 in order to move with the operator's rising motion, and rotates between a state in which it falls backwards and a state in which it rises upwards about fulcrum shafts 36 and 37 located on the front side. A back rest elevating guide mechanism 24 constituted by a freely parallel crank mechanism, and this back rest elevating guide mechanism 24,
This seat device is equipped with a lock mechanism 25 that can be operated by foot to fix or release the parallel crank mechanism from the rearwardly tilted state and upwardly raised state.

(Function) In the present invention, when the operator releases the locking mechanism 25 to free the backrest lifting guide mechanism 24 and stands up, the operator and the safety seat belt 2
2, the integral back rest 23 also separates from the seating part 21 and rises, so when the lifting guide mechanism 24 is fixed by the locking mechanism 25 in the raised state, the back rest 23 in the raised state returns to the standing position. It also functions as a back rest for the operator, and the operator is safely fixed by the back rest 23 and the seat belt 22. At this time, without using hands while operating the steering wheel, etc., and without having to take off and put on the seatbelt 22 one by one, the seatbelt 22 allows the seatbelt 22 to be integrated with the operator's back by simply standing up after the lock is released by stepping on the foot. The posture of the backrest 23 can be changed from a sitting position to a standing position while following the movements of the back, and even in the standing position, the backrest 23 can be locked by stepping on the foot.
You can operate the handle, etc. in a stable state with your back supported.

When the operator wants to sit down, the lock mechanism 25 is released and the operator sits down on the seating section 21.
Integrated backrest 23 with safety seat belt 22
Since the seat is lowered onto the seat 21, the position of the back rest is fixed by the lock mechanism 25, and then the operator performs work in a seated position while being protected by the conventional safety seat belt.

(Example) Hereinafter, the present invention will be explained in detail with reference to the example shown in FIGS. 1 to 11.

As shown in FIG. 1, the seating section 2 of the seating device
1, a backrest 2 is integrated with the back of the operator in the seated position by means of a safety seat belt 22.
3 is provided so as to be able to rise with the operator's rising motion by a backrest lifting guide mechanism 24,
A locking mechanism 25 is provided to the back rest lifting guide mechanism 24 for fixing the lowered position (FIG. 2) and raised position (FIG. 3) of the back rest 23 in the seated and standing positions of the operator. In addition, the second
In the figure and FIG. 3, 26 is an auxiliary seat.

As shown in Fig. 4, the backrest lifting guide mechanism 24 is composed of parallel crank mechanisms located on both the left and right sides of the seating portion 21.
An inner mounting plate 32 and a sector-shaped outer mounting plate 33 are integrally provided at a predetermined interval on each of the left and right sides of the frame, and a lowering stopper 34 is provided between the lower portions of the plates, and an upper stopper 35 is provided between the upper portions of the plates. Furthermore, links 38 and 39 are connected between the mounting plates 32 and 33 by fulcrum shafts (bolts) 36 and 37.
One end of the link 39 is rotatably provided.
The backrest moving fittings 43 are attached to the other ends of the 8 and 39 by shafts 41 and 42.
The backrest 23 is attached between the shaft 42 and the link 38 with a bolt. A tension spring 40 is stretched between the shaft 42 and the middle part of the link 38, and the tension of the spring 40 applies an upward pushing force to the backrest 23 that is approximately equal to the weight of the backrest 23, making it easy to raise the backrest 23.

As shown in FIG. 1, the safety seat belt 22 provided on the back rest 23 has its base end fixed to the back rest moving metal fitting 43a on one side, similar to the safety belt used for automobile seats. A buckle 45 is provided at the tip of the belt 44, and a removable metal fitting 47 is fitted into the buckle 45 to a belt 46 whose both ends are fixed to the back rest moving metal fitting 43b on the other side and the back plate of the back rest 23. After the operator sits on the seat, the seat belt 22 is fastened by fitting the metal fitting 47 into the buckle 45, and by pressing the release button 48 in the center of the buckle 45, the metal fitting 47 is released. The lock is released and removed from the buckle 45.

As shown in FIG.
5, the back rest lifting guide mechanism 24 is fixed or unlocked by lock pins 52 and 53 on both the left and right sides, which are operated by a foot pedal 51. As shown in FIG. Reference numerals 52 and 53 designate a pair of shaft support members 56 that are slidably fitted inside cylindrical members 54 and 55 that are welded to the inner mounting plate 32 on both sides, and are also welded to the inner mounting plate 32 on the right side. , 57, a rotating shaft 58 is rotatably held, and the central part of a lever 59 is welded to one end of this rotating shaft 58.
The connecting shaft 61 of No. 3 is movably fitted in the elongated hole 60, and the right end connecting portion 63 of the linkage 62 is rotatably fitted into the hole on the other side of the lever 59.
A left end connecting portion 64 of the linkage 62 is rotatably fitted to the end of the lock pin 52. This linkage 62 is pulled leftward by a spring 65 stretched between it and the left inner mounting plate 32. Therefore, the pin 52 on the left side is pressed to the left, and the pin 53 on the right side is pressed to the right via the lever 59, and both are drilled into the links 38 and 39 of the backrest lifting guide mechanism 24, respectively. The pin hole 6 drilled in the outer mounting plate 33 through either one of the pin holes 66 (FIG. 4)
7 (FIG. 4). On the other hand, a rotary lever 6 is attached to the front end of the rotary shaft 58.
A chain 70 is connected to the tip of the lever 68 via a spring 69, and the chain 70 is connected to the foot pedal 51 as shown in FIG.

As shown in FIG. 6, the seat plate 31 of the seating section 21 is attached to a seat height adjustment mechanism 76 provided on a base 75 inside the cab.
This seat height adjustment mechanism 76 includes support members 78, 7 on both left and right sides, which are rotatably connected in an X shape by a shaft 77.
The rear ends of each of the support members 78 and 79 are rotatably attached to the rear ends of the lower frame 82 and the upper frame 83 by shafts 80 and 81, respectively.
The front ends of the rollers 82 and 83 are provided so as to be movable in the front and rear directions along the frames 82 and 83 by rollers 84 that are pivotally supported respectively. Then, when the front end of the one support member 78 is adjusted in the front-rear direction by a screw (not shown) that is rotated by a knob 85 rotatably provided on the upper frame 83,
The front end of the member 79 is similarly moved back and forth within the frame 82, thereby adjusting the upper frame 83 vertically. A pair of mounting plates 86 are welded to this upper frame 83. Four bolt insertion holes 87 are bored in this mounting plate 86, and bolts (not shown) inserted into these holes 87 are inserted into the mounting plates 86. The four bolt insertion holes 88 (fifth
(Fig.) is fixed. Therefore, the seat plate 31 is vertically adjusted together with the upper frame 83, and the height of the seat is adjusted.

The seating portion 21 is provided so as to be adjustable fore-and-aft by a slide mechanism (provided on the seat plate 31) similar to the seat slide mechanism used for adjusting the fore-and-aft motion of a normal seat.
In FIG. 3, 91 is a rail for moving the seat back and forth, and 92 is a release lever for adjusting the slide.

As shown in FIG. 4, the elevating guide mechanism 24 on the backrest 23 side is provided so as to be adjustable forward and backward with respect to the seat plate 31 on the seating section 21 side. That is, an elongated hole 95 in the longitudinal direction is bored in the upper part of the inner mounting plate 32, and the seat plate 31 and the inner mounting plates 32 on both sides are fixed by bolts 96 inserted through the elongated hole 95. There is. Therefore, by loosening this bolt 96, the back rest elevating guide mechanisms 24 on both sides of the seat plate 31 can be adjusted to move forward and backward, and the back rest 23 can be adjusted back and forth relative to the seating portion 21. Also, the back support 2 by this bolt 96
Instead of the longitudinal motion adjustment mechanism of 3, a slide mechanism (such as the rail 91 described above) similar to the seat slide mechanism used for normal seat longitudinal motion adjustment is installed between the seat plate 31 and the left and right inner mounting plates 32. A mechanism consisting of the following may be provided.

Note that in FIGS. 1 and 3, the safety seat belt 22 is provided integrally with the backrest 23, while in FIGS. 8 and 10 show a state in which the back rest lifting guide mechanism 24 is tilted backwards about a fulcrum shaft arranged on the handle etc. side of the seating portion 21, and a state in which the backrest lifting guide mechanism 24 is tilted upward. The point that it is constituted by a parallel crank mechanism that can be freely rotated between the sitting position and the upright position is clearly shown, and the point that the locking mechanism is provided in the backrest lifting guide mechanism so that it can be operated by foot is clearly shown in Fig. 11. .

Next, the operation of this embodiment will be explained.

As shown in FIG. 7, first, the operator fastens the safety seat belt 22 while sitting in the seat. While the motor grader is running, the driver operates the steering wheel in this sitting position. At this time, the backrest 23 is lowered onto the seating part 21, and as shown in FIG. The lock pins 52 and 53 are inserted to fix the backrest position.

In addition, as shown in FIG. 9, when the operator works on the motor grader while standing up, the operator must first press the pedal 51 provided in front of the seat.
By stepping on with your left foot, the lever 68 is rotated counterclockwise via the chain 70, and the lever 59 is also rotated counterclockwise via the shaft 58, as shown by the two-dot chain line in FIG. The spring 65
The left side lock pin 52 is pulled out from the pin hole of the left side link 38 via the linkage 62 which is moved against the movement, and the right side lock pin 53 is pulled out from the pin hole of the right side link 38. When the operator stands up while depressing the pedal 51, the backrest 23, which is integrally attached to the operator's back with the seat belt 22, moves to the seat 21 as the operator stands up. separated from and raised. As shown in FIG. 10, this rise of the backrest 23 causes the stopper 35 to
When the lock pins 52 and 53 are locked into the pin holes provided in the lower link 39, the lock pins 52 and 53 are inserted into the pin holes provided in the lower link 39 by releasing the foot from the pedal 51. guess 2
The rising state of 3 is fixed.

As shown in FIG. 10, the backrest 2
3 is moved forward while being raised by the backrest lifting guide mechanism 24, and it matches the locus of movement of the operator's back when he stands up from a sitting position. 2
3, the operator can stand up freely, and the back of the operator who has stood up can be comfortably supported by the back support 23 that has been moved forward as described above.

When sitting down, as in the case of standing up, step on the pedal 51 and pull out the lock pins 52 and 53 on both sides from the pin holes of the link 39.
3 is made movable, the backrest 23 moves backward while descending as the operator sits down, and when the link 39 is locked by the stopper 34 and the foot is released from the pedal 51, the spring 65 As shown in FIG. 8, the tensile force causes the pins 52, 53 to be inserted into the pin holes of the upper link 38, and the lowered position of the backrest 23 is fixed.

The back rest elevating guide mechanism 24 has the advantage that it can be moved in the front and rear directions as the back rest 23 is raised and lowered, since it is constituted by a parallel crank mechanism having the structure shown in the figure. There is an advantage that the degree of inclination of the stopper 23 does not change.

Note that the seat device of the present invention is not only implemented in the cab of the motor grader shown in the drawings, but may also be implemented in the operator seat of other construction machinery vehicles.

[Effect of idea]

According to the present invention, for the seating portion of the seat device,
A back rest that is integrated with the back of the operator in the seated position by means of a safety seat belt is provided so as to be able to rise with the operator's standing up motion by a back rest elevating guide mechanism, and with respect to the back rest elevating guide mechanism, A locking mechanism is provided that fixes the lowered and raised positions of the backrest depending on the operator's sitting or standing posture, so the user can change from sitting to standing while wearing the safety seat belt.
Further, the reverse posture can be easily changed simply by releasing the lock mechanism, and even in the standing position, the safety of the operator can be ensured by the backrest fixed by the lock mechanism and the safety seat belt. In addition, the operator can stand up from a seated position by releasing the locking mechanism while wearing the seatbelt, without having to take his hands off the steering wheel while operating the steering wheel, etc., and can follow the operator's rising motion. As a result, the backrest, which is integrated with the operator's body through the seat belt, rises diagonally forward, so even when working in a standing position, the backrest, which is fixed by the locking mechanism located on the operator's back, is not in sync with the backrest. A tactile sensation is provided by the seat belt, and the operator can operate the steering wheel, etc. while maintaining stability in a standing position with the support of this backrest. Similarly, when changing the posture from the standing posture to the sitting posture, the operator can easily shift to the sitting posture and fix the backrest position without taking his hands off the handle or the like.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the seat device of the present invention, Fig. 2 is a perspective view of the seat in a lowered state, Fig. 3 is a perspective view of the seat in a raised state, and Fig. 4 is a perspective view of the seat in a lowered state. FIG. 5 is a perspective view of the locking mechanism, FIG. 6 is a perspective view of the seat height adjustment mechanism, FIG. 7 is a perspective view of the operator's seating position, and FIG. 8 is a perspective view of the locking mechanism. 9 is a perspective view showing the operator's standing posture, FIG. 10 is a side view showing the back rest lifting guide mechanism at that time, and FIG. 11 is the operation of the locking mechanism. 12 is a side view showing a conventional seat, FIG. 13 is a front view thereof, and FIG. 14 is a perspective view of a motor grader. 21... Seat portion, 22... Safety seat belt,
23... Back rest, 24... Back rest lifting guide mechanism,
25... Lock mechanism, 36, 37... Fulcrum shaft.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a seat device facing the steering wheel, etc. of a construction machinery vehicle, a backrest provided so as to be able to rise forward relative to the seating portion of the device, and a seat provided on the backrest. A safety seat belt that is movable together with a back rest; and a safety seat belt that is provided on both left and right sides of the seating portion so that the back rest can be moved with the operator's rising motion, and that can be bent backward and upward about a fulcrum shaft located on the front side. A back rest elevating guide mechanism constituted by a parallel crank mechanism that is rotatable between a raised state and a back rest elevating guide mechanism; 1. A seat device for a construction machinery vehicle, comprising a locking mechanism operable by foot operation to fix or release the fixing state. (2) The parallel crank mechanism of the backrest lifting guide mechanism is
A seat device for a construction machinery vehicle according to claim 1, characterized in that the seat device is provided with a tension spring that biases the backrest in an upward direction. (3) The construction machinery vehicle according to claim 1, wherein the locking mechanism fixes or unlocks the backrest lifting guide mechanism by a locking pin operated by a foot pedal. seat equipment. (4) The seating device for a construction machinery vehicle as set forth in claim 1 of the utility model registration claim, wherein the seating portion is provided so that the seating height can be adjusted. (5) The seat device for a construction machinery vehicle as set forth in claim 1 of the utility model registration claim, wherein the seating portion is provided so as to be adjustable in longitudinal motion. (6) The seat device for a construction machinery vehicle as set forth in claim 1 of the utility model registration claim, wherein the backrest is provided so as to be adjustable in forward and backward movement with respect to the seating portion.