JPS581085Y2 - Structure of safety frame in vehicles such as agricultural tractors - Google Patents

Description

[Detailed Description of the Invention] This invention relates to the structure of a safety frame installed upright on a vehicle such as an agricultural tractor.

As is well known, in agricultural tractors and the like, a safety frame such as a gate type is installed on the body of the machine, and the frame protects the operator from danger when the vehicle falls over.

In this case, the safety frame is usually a pair of vertical frames on the left and right that surround both sides of the seat from both sides of the aircraft, and a horizontal frame for connection installed horizontally between the upper ends of both vertical frames. In the past, the horizontal frame was completely fixed to the vertical frame, creating an integral frame that could absorb the impact of a fall as a whole.

As a result, the initial impact of the fall acts directly on the bottom base of the safety frame, so in order to sufficiently withstand this impact, it is necessary to strengthen not only the entire frame, but also the base attachment point. Increased weight is unavoidable, and this not only increases costs, but also raises the problem of a vehicle with a safety frame that raises the center of gravity, making it more likely to overturn.Furthermore, the shock of overturning is directly felt by the operator. Because of this, there was a risk of a major accident occurring, and it is hoped that these problems will be resolved.

This idea was devised to solve the above-mentioned problem, and its purpose was to construct the safety frame itself to provide cushioning when the vehicle falls over, thereby making the frame thinner and lighter and cheaper. Make it possible to produce
Moreover, the center of gravity of the entire vehicle is reduced to make the vehicle excellent in stability, and the fuselage side and the frame attachment part are subjected to static loads with little impact to prevent damage to these parts. Our goal is to provide a safety frame structure for vehicles such as tractors, and its features are:
at least a pair of left and right vertical frames erected on the aircraft;
A cylindrical horizontal frame is provided at the upper end of the vertical frame, and the horizontal frame is suspended horizontally so that both left and right ends protrude outward in the horizontal direction, and the receiving plate at the upper end of each vertical frame and the horizontal frame are
They are fastened together by a connector that is inserted through the first to third ports formed in these, and the first port of the receiving plate and the third port of the horizontal frame on the side far from the receiving plate have a play with respect to the connector. is made small, and the second passage on the receiving plate side of the horizontal frame has a small play with respect to the connector so as to allow the horizontal frame to slide due to a lateral impact.

The specific examples shown in the drawings will be described below.

In the drawing, the body 1 of the agricultural tractor has a mission case 2 at its rear, a seat 3 is suspended from the top of the case 2, and fenders 4 are installed on both sides of the case 20.
It is equipped with a rear wheel 5 that can be freely driven.

Reference numeral 6 denotes a mounting base installed horizontally at the rear bottom of the mission case 2, and a safety frame F having an inverted side profile and a back gate shape is erected through the protruding parts on both sides of the base 60, and the seat 3
The structure is designed to cover the outer periphery of the body rigidly.

The safety frame F includes a pair of left and right vertical frames 7°I,
It has a connecting horizontal frame 8 installed horizontally between the upper ends of both vertical frames 7 and 7, and a front frame 9 provided as a front overhang to cover a zenith sheet (not shown).

Each vertical frame I has a tapered shape by removing the rear portion of the upper end, and L-shaped connecting receiving plates 10 and 10 are respectively welded to leave a space S on the tapered back side. Board 10
The seat part 10a is fixed to the top of the vertical frame 10 horizontally and extends from both sides, the rear buffer part 10b extends rearward from the seat part 10a, and the back wall of the vertical frame 7. In particular, the rear buffer portion 10b is located at the rearmost side of the safety frame F and can be plastically deformed so as to be crushed in the event of a fall.
In addition, a pair of circular first ports 11 are provided on each side of the protruding portions on both sides of each seat portion 10a, and a pair of circular first ports 11 are provided on the lower wall of the cylindrical horizontal frame 8 corresponding to each port 11. A corresponding number of elongated second ports 12 are provided therethrough, and a third port 13 is provided through the upper wall facing the second ports 12.
The connector 14 inserted through the second port 12 from the first
A horizontal frame 8 inserted into the opening 11 is connected to the vertical frame 7, and shock receiving portions 8a extending outward are formed at both ends of the horizontal frame 80, as shown in FIG. (When a falling shock is applied, the entire horizontal frame 8 shifts upward and moves backward in response to the impact on the corresponding shock receiving part 8a, and at this time, the connector 14 is inserted through the elongated second port 12. The vehicle is tilted with respect to the first port 11, thereby alleviating the impact when the vehicle rolls over.

Furthermore, when the connector 14 is tilted, the horizontal frame 8 does not slide, and an impact is applied to the horizontal frame 8 via the connector 14 so as to crush its cylindrical shape toward the receiving plate 10. It has a shock-reducing effect.

If the front frame 9 is connected to the horizontal frame 8, the added weight will work together as a buffer, and if it is connected to the vertical frame 7, the resistance of both vertical frames 7 and 7 will be increased. Furthermore, a seat holder 15 may be provided within the plane of the front frame 9, with both ends inserted into the frame 9.

Further, the second passage port 12 is not limited to a long hole as shown in the first illustrated example, but may be configured as a large diameter circular hole concentric with the connector 14 in order to cope with falling sideways and backwards. be.

Other 3-post or 4-post safety frames will also be tested.

This invention is as described above, and the receiving plate at the upper end of the vertical frame and the horizontal frame are connected by a connector that is inserted through the first to third ports formed in these, and the first port of the receiving plate is connected to the horizontal frame. and the third port on the side far from the receiving plate of the horizontal frame have a small play with respect to the connector, and the second port on the side of the receiving plate of the horizontal frame is small.
The opening allows play against the coupling to allow sliding of the lateral frame due to lateral impact, so
In the event of a fall, the horizontal frame slides within the allowable range of the second port to alleviate the impact, and after the sliding, the cylindrical horizontal frame receives an impact that crushes it against the receiving plate side via the connector. At this time, the crushing of the horizontal frame also causes a cushioning effect. Therefore, the impact can be effectively cushioned in two stages, so the frame can be made from lighter and thinner members at a lower cost, and the center of gravity of the entire vehicle can be lowered. By adding a safety frame, we can provide a vehicle that is not too expensive and has less risk of falling over, and the cushioning also reduces damage to the attachment part of the safety frame and the transmission case, which is the other side, and prevents the operator from accidentally falling due to shock. I can't imagine it happening.

In addition, since the play between the first port of the receiving plate and the third port of the horizontal frame relative to the connector is small, the horizontal position of the horizontal frame can be easily determined during assembly, and the horizontal frame is Despite being able to slide, it is easy to work with.

[Brief explanation of the drawings] Fig. 1 is an overall side view showing the embodiment of this invention for a safety frame for an agricultural tractor, Fig. 2 is an enlarged perspective view of the main parts of the safety frame, and Fig. 3 is a vertical frame. Fig. 4 is a vertical sectional view of the connection part based on Fig. 3, Fig. 5 is a sectional view taken along the line V-V in Fig. 4, and Fig. 6 is a buffered state. FIG. 7 is a cross-sectional view showing an example in which the second port is a large-diameter circular hole. 1... Airframe, I... Vertical frame, 8.
4. Horizontal frame, F...Safety frame.

Claims (1)

[Scope of utility model registration request] at least a pair of left and right vertical frames erected on the aircraft;
A cylindrical horizontal frame is provided at the upper end of the vertical frame, and the horizontal frame is suspended horizontally so that both left and right ends protrude outward in the horizontal direction, and the receiving plate at the upper end of each vertical frame and the horizontal frame are
They are fastened together by a connector that is inserted through the first to third ports formed in these, and the first port of the receiving plate and the third port of the horizontal frame on the side far from the receiving plate have a play with respect to the connector. An agricultural tractor, etc., characterized in that the second port on the receiving plate side of the horizontal frame has a large play with respect to the coupling device so as to allow the horizontal frame to slide due to a lateral impact. Safety frame structure in vehicles.