JPS5839263Y2 - Support structure for safety frames in agricultural tractors, etc. - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a support structure for a safety frame in an agricultural tractor or the like.

As is well known, vehicles such as agricultural tractors are generally provided with a safety frame to protect the operator from the danger of falling over.

In this case, the safety frame is usually formed in the form of a gate, for example, and is erected by connecting only the lower end of this gate-shaped frame to the aircraft body. In order to stop the chisel, it concentrates as an extremely large moment at that point,
As a result, there is a high risk that the lower end will be damaged and the safety frame will fall down.As a countermeasure to this, it would be good to make the lower end attachment point thicker, but for example, in small agricultural vehicles, there is not enough space for this installation. However, there was a problem with the installation space for other equipment.

In particular, in the case of agricultural tractors, which are small special vehicles, the lower half should be fitted with a narrow pole body width, and the frame should be thickly encircled on both sides of the operator to ensure a wide safety margin (special In this case, between the top and bottom of the safety frame,
Since the upper half is wide, it is normal that there are bends.

Therefore, if there is this bending, stress will easily concentrate at this point during a rollover, for example, and it will easily break at this point.In order to prevent this, the entire frame is made with a thick cross section and has a margin, but if the frame is too thick, If this happens, the center of gravity of the frame itself will be higher than the center of gravity of the vehicle's water, and the center of gravity of the entire vehicle with the frame will shift upwards, making the vehicle more likely to tip over, so countermeasures are desired. This is where I am.

This invention was devised to solve the above problem, and in a safety frame whose lower part is fixed to the car body, the safety frame has a pair of left and right vertical frames, and the middle part of the vertical frame is attached to the car body. The upper part is wide by bending outward, and the horizontal part and the rising part are L.
A horizontal part of the seat frame or seat attachment frame formed in the shape is fixed to the vehicle body, and both sides of the rising part are connected to the bent parts of the left and right vertical frames.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Figures 1 to 3 show specific plans for a small agricultural tractor.A tractor body 1 includes a mission case 4 in which a front case 2 and a rear case 3 are directly connected in front and rear.
It consists of:

The case 4 has a rear axle case 6.6 symmetrically protruding from each side through a brake actuating part 5, and a rear axle (not shown) protruding from the outer end of each rear axle case 6. ), a rear wheel 8 with a fender 7 is driven by a rear wheel 8, and a PTO shaft 9 protruding from the rear end of the transmission case 4 has a working machine attached to the rear of the tractor towed by a link mechanism 10. Universal joint 11 for driving (not shown)
are connected.

Reference numeral 12 denotes a hydraulic housing of a hydraulic device that is located on the mission case 4 and allows the pair of left and right lift arms 13 to be raised and lowered.The lift arms 13 connect both sides of the lower rear end of the case 4 and the working machine A tied lower link 14 is brought along via a lift rod 15.

Reference numeral 16 denotes a mounting base that is attached to the lower abdomen of the rear end of the transmission case 4 by a plurality of bolts a, and the base 16 has both ends overhanging from the transmission case 4, and the bolts a are inserted into the overhanging portions. As a result, a safety frame F having an inverted side view and a back view gate type is erected.

The safety frame F includes a pair of left and right vertical frames 17.17 that protrude from each protruding part of the mounting base 16 through both sides of the mission case 4, and a connecting plate 18 between the upper ends of both vertical frames 17.17. The top rear bar 19 is fixed with bolts a, and the first top side frame 20.20 is a slightly short cylindrical first side frame 20.20 that extends forward from the upper end of each vertical frame 17.17 and is connected by a connecting plate 18. It has a pair of left and right second top side frames 21° 21 which are inserted into and supported by the side frames 20 and 20 and fixed with bolts a. A front par 22 is installed horizontally.

Both vertical frames 17.17 have a narrow lower half and a wide upper half, and symmetrically have an inverted V-shaped bent part (b) in the middle between the upper and lower parts to form an upwardly expanding shape.

23 is a frame for installing the seat, with a horizontal part 25 and a rising part 2.
4 and is formed into an L shape, and in this example, the horizontal part 25 protrudes downward and the bolt a is attached to the hydraulic housing 12 which becomes the vehicle body.
, and both sides of the rising portion 240 are fixed at the bent portions s and b.
is connected to via bolt a.

To attach the seat, the rising part 24 of the frame 23 is made wide and a backrest body 26 is attached to the front surface as a cushion, and the platen 21 is attached to the upper surface of the horizontal part 25 via a cushion 29. An armrest 28 is attached to the side and constitutes a seat 30.

In addition, for seat attachment, the frame 23 may be a seat frame formed in an L shape with a horizontal part 25 and a rising part 24,
At this time, the horizontal part 25 becomes a seat pan, and the rising part 24 forms a backrest part.

Incidentally, the zenith of the safety frame F is entirely covered with a sheet 31 for sun protection, but in this specific example, a plurality of rods 3 are installed between the top side frames 21 and 21 of the brush 2.
2 are arranged side by side, and this receiving rod 32 is supported at both ends in the hole 34 of the side frame 21 by its own threaded portion 33 and nut C, and in the center of the receiving rod 32 is a U-shaped ball-shaped receiving rod. Part 3
5, and a clamping tool 36 protruding from the bottom surface of the seat 31, as shown in FIG.

On the same side, disassembly and assembly can be easily and reliably performed by one person, and the seat 31, second top side frame 21, 21, etc. can be attached to and detached from the safety frame F, which is convenient.

This idea is as described above, and in order to widen the safety range, the safety frame has a pair of left and right vertical frames that are bent in the middle toward the outside of the vehicle body to form a wide upper part. In the case of a seat frame or seat installation that is formed into a 17 shape with a horizontal part and a rising part, the horizontal part of the frame is fixed to the vehicle body, and both sides of the rising part are connected to the bent part of the vertical frame, so the bent part By forming this structure, it is possible to reinforce the vertical frame, which has become weak due to the application of concentrated stress in the event of a fall, and it is possible to ensure the safety of the operator.

In addition, since the connecting and reinforcing member (7) is a seat frame that constitutes the seat itself, which is essential for the vehicle, or a frame is used to attach the seat components such as the backrest, special members are not required and the seat can be manufactured at low cost.

[Brief explanation of drawings]

Figure 1 is a side view showing this invention applied to an agricultural vehicle, Figure 2 is a rear view based on Figure 1, and Figure 3 is the same as Figure 1.
2 is an exploded perspective view corresponding to FIG. 2, and FIG. 4 is a cross-sectional view showing the seat mounting structure. 1... Airframe, 12... Hydraulic pressure, 17... Vertical frame, 23... Seat frame, 30... Seat, F...Safety frame.

Claims (1)

[Scope of utility model registration request] In a safety frame whose lower part is fixed to the vehicle body, the safety frame includes a pair of left and right vertical frames, each of which is bent in the middle toward the outside of the vehicle body to form a wide upper part, and has a horizontal part and an upright part. In an agricultural tractor, etc., characterized in that a horizontal part of a seat frame or a seat mounting frame formed in an L-shape is fixed to the vehicle body, and both sides of the rising part are connected to bent parts of the left and right vertical frames. Safety frame support structure.