Rops frame for work vehicle and work vehicle

Abstract

To provide a ROPS frame of a work vehicle and the work vehicle in which weight saving of a connection part is performed when connecting a pair of pipe members in an abutting manner.SOLUTION: A ROPS frame of a work vehicle comprises: a tabular first joint member 41 and a tabular second joint member 42 which are abutted over an external surface of an end of a first pipe member 11 and an external surface of an end of a second pipe member 12; a first collar 51 and a second collar 52 which are attached to a portion facing the first joint member 41 and a portion facing the second joint member 42; and a first bolt 53 and a second bolt 54 which are installed over the first joint member 41 and the second joint member 42 through the inside of the first collar 51 and the inside of the second collar 52 to fasten the first joint member 41 and the second joint member 42 to be closer to each other.SELECTED DRAWING: Figure 18

Description

[Technical Field]

[0001] The present invention relates to a ropes frame for a work vehicle constructed with a plurality of pipe members, and to a work vehicle. [Background technology]

[0002] Patent Document 1 discloses a work vehicle and a ropes frame, in which pipe members are bent to form the ropes frame. For example, when a ropes frame is to be fitted to a relatively large work vehicle with front and rear seats, the ropes frame is formed by connecting multiple pipe members. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-280090 Summary of the Invention [Problem to be solved by the invention]

[0004] In a ropes frame constructed with a plurality of pipe members, when the ends of a pair of pipe members are arranged opposite each other and connected to each other, there is a demand for a lightweight connecting portion. The present invention aims to reduce the weight of the connecting portion when a pair of pipe members are butt-jointed to each other in the ROPS frame of a work vehicle and in the work vehicle. [Means for solving the problem]

[0005] The present invention relates to a ropes frame for a work vehicle that is constructed with a plurality of pipe members, and among the plurality of pipe members, a first pipe member and a second pipe member whose ends face each other are provided with a plate-shaped first coupling member connected to the end of the first pipe member so as to be perpendicular to the longitudinal direction of the pipe members, a plate-shaped second coupling member connected to the end of the second pipe member so as to be perpendicular to the longitudinal direction of the pipe members, and bolts attached across the first coupling member and the second coupling member that are stacked on top of each other and fasten the first coupling member and the second coupling member together.

[0006] According to the present invention, the first and second joint members are joined together by overlapping the first and second joint members with the end of the first pipe member facing the end of the second pipe member, and then attaching and tightening bolts across the first and second joint members, thereby connecting the first and second joint members together. This connects the ends of the first and second pipe members together via the first and second joint members. According to the present invention, when first and second pipe members are butted together and connected, the connecting portion can be configured to be simple and lightweight using the plate-shaped first joint member and plate-shaped second joint member.

[0007] The present invention relates to a ropes frame for a work vehicle constructed with a plurality of pipe members, wherein among the plurality of pipe members, a first pipe member and a second pipe member, whose ends face each other, are provided with a plate-shaped first coupling member abutted across the outer surface of the end of the first pipe member and the outer surface of the end of the second pipe member, and a plate-shaped second coupling member abutted across the outer surface of the end of the first pipe member and the outer surface of the end of the second pipe member, the first coupling member and the second coupling member being disposed on opposite sides of each other in a cross-sectional view of the pipe members, and a portion of the inside of the first pipe member facing the first coupling member and a portion of the front of the first pipe member facing the first coupling member are provided. a first collar attached across a portion of the second pipe member facing the first coupling member and a portion of the second pipe member facing the second coupling member, and a second collar attached across a portion of the second pipe member facing the first coupling member and a portion of the second pipe member facing the second coupling member; a first bolt attached through the inside of the first collar between the first coupling member and the second coupling member and tightening the first coupling member and the second coupling member to bring them closer to each other; and a second bolt attached through the inside of the second collar between the first coupling member and the second coupling member and tightening the first coupling member and the second coupling member to bring them closer to each other. The system further comprises a first frame arranged in a direction intersecting the first pipe member and the second pipe member, with an end portion arranged to face an end portion of the first pipe member and an end portion of the second pipe member, and a connecting member connected between the end portion of the first pipe member and the end portion of the first frame, and between the end portion of the second pipe member and the end portion of the first frame.

[0008] According to the present invention, with the end of the first pipe member and the end of the second pipe member facing each other, the first bolt is attached and tightened across the end of the first pipe member, the first coupling member, the second coupling member, and the first collar, thereby connecting the first coupling member and the second coupling member to the end of the first pipe member. The first and second coupling members are connected to the end of the second pipe member by installing and tightening a second bolt through the end of the second pipe member, the first and second coupling members, and the second collar.

[0009] As a result, the ends of the first and second pipe members are connected to each other via the first and second joint members. Buckling of the first and second pipe members due to tightening of the first and second bolts is prevented by the first and second collars. According to the present invention, when first and second pipe members are butted together and connected, the connecting portion can be configured to be simple and lightweight using the plate-shaped first joint member and plate-shaped second joint member. In the ropes frame of a work vehicle, when the first and second pipe members are butted against each other and connected, the first frame may be positioned along a direction intersecting the first and second pipe members, and the ends of the first frame may be positioned so as to face the ends of the first and second pipe members, and the first frame may be connected to the first and second pipe members. According to the present invention, the connecting member is connected across the end of the first pipe member and the end of the first frame, and is connected across the end of the second pipe member and the end of the first frame. This is advantageous in terms of improving the strength of the ROPS frame, as the ends of the first and second pipe members and the end of the first frame are connected via the connecting member.

[0010] The present invention relates to a ropes frame for a work vehicle that is constructed with a plurality of pipe members, and among the plurality of pipe members, a first pipe member and a second pipe member whose ends face each other. The plurality of pipe members are provided with a plate-shaped coupling member whose one portion is connected to the inner surface of the end of the first pipe member and whose other portion protrudes from the end of the first pipe member, a nut connected to the inner surface of the other portion of the coupling member, and a bolt that is attached to the nut from the outside of the end of the second pipe member and that fastens the second pipe member and the coupling member to each other, the other portion of the coupling member being inserted into the end of the second pipe member.

[0011] According to the present invention, with the end of the first pipe member and the end of the second pipe member facing each other, the coupling member is inserted into the end of the second pipe member, and a bolt is attached and tightened across the end of the second pipe member, the coupling member, and the nut, thereby connecting the ends of the first and second pipe members via the coupling member. According to the present invention, when first and second pipe members are butt-joined to each other, the joint portion can be configured to be simple and lightweight using a plate-shaped joint member.

[0012]

[0013]

[0014]

[0015] In the present invention, it is preferable that a second frame is provided, which is arranged along a direction that intersects the first pipe member and the second pipe member and intersects the first frame, and has an end portion arranged so as to face the end portion of the first pipe member and the end portion of the second pipe member, and that the connecting member is connected across the end portion of the first pipe member and the end portion of the second frame, and across the end portion of the second pipe member and the end portion of the second frame.

[0016] In the ROPS frame of a work vehicle, when the first and second pipe members and the first frame are connected as described above, the second frame may be arranged along a direction intersecting the first and second pipe members and the first frame, and the ends of the second frame may be arranged so as to face the ends of the first and second pipe members and the end of the first frame, and the second frame may be connected to the first and second pipe members.

[0017] According to the present invention, in addition to connecting the ends of the first and second pipe members to the end of the first frame, the connecting member also connects the end of the first pipe member to the end of the second frame, and connects the end of the second pipe member to the end of the second frame. This is advantageous in terms of improving the strength of the ROPS frame, as the ends of the first and second pipe members and the ends of the first and second frames are connected via connecting members.

[0018] According to the present invention, the connecting member has the function of connecting the ends of the first and second pipe members to the ends of the first frame, as well as the function of connecting the ends of the first and second pipe members to the ends of the second frame, which is advantageous in terms of simplifying the structure of the connecting member.

[0019] In the present invention, it is preferable that an end of the first frame and an end of the second frame are connected to each other.

[0020] According to the present invention, in addition to the ends of the first and second pipe members being connected to the ends of the first frame and the second frame via connecting members, the ends of the first frame and the second frame are also connected to each other, which is advantageous in terms of improving the strength of the ropes frame.

[0021] In the present invention, it is preferable that the portion where the connecting member is connected to the end of the first pipe member and the portion where the connecting member is connected to the end of the second pipe member are positioned apart from each other, and that the portion where the end of the first pipe member and the end of the second pipe member face each other is positioned between the portion where the connecting member is connected to the end of the first pipe member and the portion where the connecting member is connected to the end of the second pipe member.

[0022] According to the present invention, when the connecting member is connected to the ends of the first and second pipe members, the portion where the connecting member is connected to the end of the first pipe member and the portion where the connecting member is connected to the end of the second pipe member are positioned apart from each other. Since the portion where the end of the first pipe member faces the end of the second pipe member is positioned between the portion where the connecting member is connected to the end of the first pipe member and the portion where the connecting member is connected to the end of the second pipe member, interference between the connecting portion of the ends of the first and second pipe members and the connecting member can be easily avoided.

[0023] In the present invention, it is preferable that the connecting member is connected to the end of the first pipe member by abutting the connecting member against the outer surface of the end of the first pipe member and a first auxiliary connecting member is abutted against the outer surface of the end of the first pipe member and connected to the connecting member, and that the connecting member is connected to the end of the second pipe member by abutting the connecting member against the outer surface of the end of the second pipe member and a second auxiliary connecting member is abutted against the outer surface of the end of the second pipe member and connected to the connecting member.

[0024] According to the present invention, the connecting member and the first auxiliary connecting member (second auxiliary connecting member) are wound around the end of the first (second) pipe member from the outside, so that the connecting member is connected to the end of the first (second) pipe member. This allows the connecting member to be firmly connected to the end of the first (second) pipe member without being affected by the cross-sectional shape of the end of the first (second) pipe member.

[0025] The work vehicle of the present invention is equipped with the above-mentioned ROPS frame.

[0026] According to the present invention, by providing a work vehicle with a ROPS frame that is constructed simply and lightly as described above, the weight of the work vehicle can be reduced. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 2 is a left side view of the work vehicle in the reference embodiment. [Figure 2] FIG. 1 is a left side view of a rope frame in a reference embodiment. [Figure 3] FIG. 1 is a plan view of a rope frame in a reference embodiment. [Figure 4] FIG. 2 is a perspective view of a rope frame in a reference embodiment. [Figure 5] FIG. 10 is an exploded perspective view of the left side portion of the ROPS frame in the reference embodiment. [Figure 6] FIG. 10 is an exploded perspective view of the right side of the ROPS frame in the reference embodiment. [Figure 7] FIG. 10 is a cross-sectional plan view of the vicinity of the left front joint member of the ROPS frame in the reference embodiment. [Figure 8] 8 is a cross-sectional view taken along the line VIII-VIII in FIG. 7 in the reference embodiment. [Figure 9] FIG. 10 is an exploded perspective view of the vicinity of the left front joint member of the ROPS frame in the reference embodiment. [Figure 10] FIG. 10 is a cross-sectional plan view of the vicinity of the left rear joint member of the ROPS frame in the reference embodiment. [Figure 11] 11 is a cross-sectional view taken along the line XI-XI in FIG. 10 in the reference embodiment. [Figure 12] FIG. 10 is an exploded perspective view of the vicinity of the right rear joint member of the ROPS frame in the reference embodiment. [Figure 13] FIG. 10 is a left side view of the vicinity of the connection between the upper rear end of the left pipe member and the upper front end of the left pipe member in the ROPS frame in the reference embodiment. [Figure 14] 14 is a cross-sectional view taken along the line XIV-XIV in FIG. 13 in the reference embodiment. [Figure 15] 15 is a cross-sectional view taken along the line XV-XV in FIG. 13 in the reference embodiment. [Figure 16] FIG. 10 is a cross-sectional plan view of the vicinity of the connection between the upper rear end of the left pipe member and the upper front end of the left pipe member in the ROPS frame in the reference embodiment. [Figure 17] FIG. 10 is a perspective view of a connecting member in the reference embodiment. [Figure 18] FIG. 1 is a vertical cross-sectional side view of the vicinity of the connection portion between the upper rear end portion of a pipe member and the upper front end portion of a pipe member in a ROPS frame according to an embodiment of the present invention. [Figure 19] FIG. 10 is a vertical cross-sectional front view of the vicinity of the connecting portion between the upper rear end portion of a pipe member and the upper front end portion of a pipe member in a ROPS frame in a first alternative embodiment of the invention. [Figure 20] FIG. 10 is a vertical cross-sectional side view of the vicinity of the connecting portion between the upper rear end portion of a pipe member and the upper front end portion of a pipe member in a rope frame in a second alternative embodiment of the invention. [Figure 21] FIG. 10 is a vertical cross-sectional side view of the vicinity of the connecting portion between the upper rear end portion of a pipe member and the upper front end portion of a pipe member in a ROPS frame in a fourth alternative embodiment of the invention. DETAILED DESCRIPTION OF THE INVENTION

[0028] Figures 1 to 21 show a multipurpose work vehicle equipped with a rope frame 7 and joint members 20, 30, and in Figures 1 to 21, F indicates the forward direction, B indicates the rearward direction, U indicates the upward direction, D indicates the downward direction, R indicates the rightward direction, and L indicates the leftward direction. Hereinafter, a reference embodiment for clarifying the present invention will be described with reference to FIGS. 1 to 17, and an embodiment of the present invention will be described with reference to FIG.

[0029] (Reference form) (Overall configuration of the work vehicle) As shown in Fig. 1, a vehicle body 3 is supported by right and left front wheels 1 and right and left rear wheels 2. The vehicle body 3 is provided with right and left front seats 4 and right and left rear seats 5, and a luggage rack 6 is provided behind the rear seats 5.

[0030] A roof protection frame 7 is provided to cover the front seats 4 and rear seats 5. A windshield 8 (see Figure 7) is provided in front of the roof protection frame 7, a rear glass 9 (see Figure 10) is provided in the rear of the roof protection frame 7, and a roof 33 is provided on top of the roof protection frame 7. Right and left front doors 18 are provided on the right and left sides of the front of the roof protection frame 7, and right and left rear doors 19 are provided on the right and left sides of the rear of the roof protection frame 7.

[0031] (Overall structure of the ROPS frame) As shown in Figures 1 to 4, the rope frame 7 is provided with right and left pipe members 10 that are channel-shaped when viewed from the side, right and left pipe members 11 that are angle-shaped when viewed from the side, right and left pipe members 12 that are angle-shaped when viewed from the side, right and left frames 13 and 14, etc.

[0032] The upper front end of the pipe member 10 and the lower front end of the pipe member 11 are connected via a front joint member 20, a frame 15 is connected between the right and left front joint members 20, and a flat frame 17 is connected between the right and left pipe members 11.

[0033] The upper rear end of the pipe member 10 and the lower rear end of the pipe member 12 are connected via a rear joint member 30, and the upper rear end of the pipe member 11 and the upper front end of the pipe member 12 are connected. A frame 16 and a flat frame 23 are connected across the right and left pipe members 12, and right and left handles 24 for getting on and off are connected to the pipe members 12.

[0034] The right and left frames 13 are connected in the vertical direction across the front-to-rear intermediate portion of the pipe member 10 and the connecting portion between the upper rear end of the pipe member 11 and the upper front end of the pipe member 12, and right and left handle portions 24 for getting on and off are connected to the frames 13.

[0035] The frame 14 is connected in the left-right direction across the connecting portion between the upper rear end of the right pipe member 11 and the upper front end of the right pipe member 12, and the connecting portion between the upper rear end of the left pipe member 11 and the upper front end of the left pipe member 12.

[0036] A windshield 8 (see FIG. 7) is attached across the right and left pipe members 11 and frames 15, 17. A rear window 9 (see FIG. 10) is attached to the frame 23 so as to be openable and closable in the longitudinal direction.

[0037] Right and left front doors 18 are attached to the frame 13 via hinge members 25 so as to be openable and closable. Right and left rear doors 19 are attached to the frame 23 via hinge members 25 so as to be openable and closable. As described above, the ROPS frame 7 is configured to include the pipe members 10, 11, and 12, the frames 13 to 17, and 23, and the like, and the pipe member 10 is connected to the machine body 3.

[0038] (Cross-sectional shape of pipe member) As shown in FIGS. 2, 3, 14 and 15, a pair of sealing surfaces 11a and 11b having an angled cross section are provided in the cross section of the pipe member 11, and the sealing surfaces 11a and 11b are arranged on opposite sides to each other in the cross section.

[0039] A pair of non-sealing surfaces 11c, 11d are provided in the cross section of the pipe member 11, and the non-sealing surfaces 11c, 11d are arranged on opposite sides of each other in the cross section, and the non-sealing surfaces 11c, 11d are arranged between the pair of sealing surfaces 11a, 11b. The sealing surfaces 11a, 11b and the non-sealing surfaces 11c, 11d are formed over the entire length of the pipe member 11.

[0040] 2, 7, 8, and 9, the pipe member 10 is also provided with a pair of sealing surfaces 10a, 10b and a pair of non-sealing surfaces 10c, 10d, similar to the pipe member 11, and the sealing surfaces 10a, 10b and the non-sealing surfaces 10c, 10d are formed over the entire length of the pipe member 10. The cross-sectional shape of the pipe member 10 is the same as the cross-sectional shape of the pipe member 11 (see FIGS. 14 and 15).

[0041] 2, 3, 14, and 15, the pipe member 12 is also provided with a pair of sealing surfaces 12a, 12b and a pair of non-sealing surfaces 12c, 12d, similar to the pipe member 11, and the sealing surfaces 12a, 12b and the non-sealing surfaces 12c, 12d are formed over the entire length of the pipe member 12. The cross-sectional shape of the pipe member 12 is the same as the cross-sectional shape of the pipe member 11 (see FIGS. 14 and 15). As shown in FIGS. 2, 3 and 4, the frames 13, 15 and 16 are formed to have a rectangular cross section, and the frame 14 is formed to have a channel-like cross section.

[0042] (Relationship between the pipe components and the windshield, front door, and rear door) As shown in Figures 2, 5, and 6, in the ROPS frame 7, the sealing surface 10a of the pipe member 10, the sealing surface 11a of the pipe member 11, and the sealing surface 12a of the pipe member 12 are connected, and the sealing surfaces 10a, 11a, and 12a of the pipe members 10, 11, and 12 face outward.

[0043] As shown in Figures 1 and 7, a rubber sealing member 26 is attached to the outer periphery of the front door 18, and when the front door 18 is operated to the closed position, the sealing member 26 comes into contact with the sealing surfaces 10a, 11a of the pipe members 10, 11 and the frame 13 (see Figure 4).

[0044] As shown in Figures 1 and 10, a rubber sealing member 27 is attached to the outer periphery of the rear door 19, and when the rear door 19 is operated to the closed position, the sealing member 27 comes into contact with the sealing surfaces 10a, 12a of the pipe members 10, 12 and the frame 13 (see Figure 4).

[0045] As shown in Figures 5 and 7, a rubber sealing member 28 is attached to the outer periphery of the windshield 8, and the windshield 8 is attached across the right and left pipe members 11 and frames 15, 17 so that the sealing member 28 contacts the sealing surfaces 11b of the right and left pipe members 11 and frames 15, 17 (see Figure 4).

[0046] As shown in Figures 6 and 10, a rubber sealing member 29 is attached to the outer periphery of the rear window 9, and when the rear window 9 is operated to the closed position, the sealing member 29 comes into contact with the sealing surfaces 10b, 12b of the pipe members 10, 12 and the frame 23 (see Figure 4).

[0047] A rubber sealing member (not shown) is attached to the outer periphery of the roof 33 (see Figure 1), and as shown in Figures 5 and 6, the roof 33 is attached across the right and left pipe members 11 and 12 so that the sealing member contacts the sealing surfaces 11b of the right and left pipe members 11 and the sealing surfaces 12b of the right and left pipe members 12.

[0048] (Configuration of previous joint member) As shown in FIGS. 1 to 4, a joint member 20 that connects an upper front end of a pipe member 10 and a lower front end of a pipe member 11 is provided with a first connecting portion 21 and a second connecting portion 22.

[0049] 5 to 9, first connecting portion 21 is provided with first sealed portion 21a and first non-sealed portion 21b, and recess 21e is formed in first contact surface 21d between first sealed portion 21a and first non-sealed portion 21b. First connecting portion 21 is provided with connecting portion 21c that is bent in side view, and third sealed portion 21f, third non-sealed portion 31h, and mounting portion 21g are provided in connecting portion 21c.

[0050] The second connecting portion 22 is provided with a second sealed portion 22a, a second non-sealed portion 22b, and a connecting portion 22c, and a convex portion 22e is formed on a second contact surface 22d between the second sealed portion 22a and the second non-sealed portion 22b.

[0051] As a result, as shown in Figure 7, when the first connecting portion 21 and the second connecting portion 22 are overlapped, a convex portion 22e having a triangular cross-section that protrudes toward the first contact surface 21d of the first connecting portion 21 in a cross-sectional view is provided on the second contact surface 22d of the second connecting portion 22, on the first contact surface 21d of the first connecting portion 21 that contacts the second connecting portion 22, and on the second contact surface 22d of the second connecting portion 22 that contacts the first connecting portion 21.

[0052] A recess 21e having a triangular cross section into which the protrusion 22e of the second connecting portion 22 fits when viewed in cross section is provided on the first contact surface 21d of the first connecting portion 21, and the recess 21e of the first connecting portion 21 is formed so as to fit from the first contact surface 21d of the first connecting portion 21 into the first non-sealed portion 21b when viewed in cross section.

[0053] (Connection state of the previous joint member) 5 to 9, connecting portion 21c of first connecting portion 21 is connected to an upper front end portion of pipe member 10, which is one of the pipe members, and frame 15 is connected to mounting portion 21g of first connecting portion 21. Connecting portion 22c of second connecting portion 22 is connected to a lower front end portion of pipe member 11, which is the other pipe member.

[0054] When the first connecting portion 21 is connected to the pipe member 10, the first non-sealed portion 21b of the first connecting portion 21 is continuous with the other of the pair of non-sealed surfaces 10c, 10d of the pipe member 10, that is, the non-sealed surface 10d. The third sealed portion 21f of the first connecting portion 21 is continuous with the sealed surface 10a, that is, one of the pair of sealed surfaces 10a, 10b of the pipe member 10. The third non-sealed portion 21h of the first connecting portion 21 is continuous with the non-sealed surface 10c, that is, one of the pair of non-sealed surfaces 10c, 10d of the pipe member 10.

[0055] When the second connecting portion 22 is connected to the pipe member 11, the second sealing portion 22a of the second connecting portion 22 is continuous with the sealing surface 11a, which is one of the pair of sealing surfaces 11a, 11b of the pipe member 11. The second non-sealing portion 22b of the second connecting portion 22 is continuous with the non-sealing surface 11c, which is one of the pair of non-sealing surfaces 11c, 11d of the pipe member 11.

[0056] As described above (Configuration of the previous coupling member), in the coupling member 20, when the first connecting portion 21 is connected to the pipe member 10 and the second connecting portion 22 is connected to the pipe member 11, the first connecting portion 21 (first contact surface 21d) and the second connecting portion 22 (second contact surface 22d) are overlapped, as shown in Figures 7 and 8.

[0057] When the first connecting portion 21 and the second connecting portion 22 are overlapped, the convex portion 22e of the second connecting portion 22 fits into the concave portion 21e of the first connecting portion 21, and the first connecting portion 21 and the second connecting portion 22 are connected by the bolt 34.

[0058] In this case, the bolt 34 is connected across the first non-sealed portion 21b of the first connecting portion 21 and the second non-sealed portion 22b of the second connecting portion 22 so as to pass through the convex portion 22e of the second connecting portion 22 and the concave portion 21e of the first connecting portion 21 in a cross-sectional view, and to intersect obliquely with the first contact surface 21d of the first connecting portion 21 and the second contact surface 22d of the second connecting portion 22.

[0059] As described above, by connecting the first connecting portion 21 and the second connecting portion 22 in the joint member 20, the front upper end portion of the pipe member 10 and the front lower end portion of the pipe member 11 are connected by the joint member 20 (the first connecting portion 21 and the second connecting portion 22) in a state where they face each other.

[0060] (Positional relationship between the previous joint and the pipe) As shown in Figures 5, 6, 7, and 9, when the first connecting portion 21 and the second connecting portion 22 of the coupling member 20 are connected, the positional relationship between the first connecting portion 21 and the second connecting portion 22 of the coupling member 20 and the pipe members 10 and 11 becomes as described below.

[0061] By connecting the first connecting portion 21 and the second connecting portion 22, the third seal portion 21f of the first connecting portion 21 and the second seal portion 22a of the second connecting portion 22 are continuous with each other. As described above (connected state of the previous coupling member), the third seal portion 21f of the first connecting part 21 is continuous with the seal surface 10a, which is one of the pair of seal surfaces 10a, 10b of the pipe member 10. The second seal portion 22a of the second connecting part 22 is continuous with the seal surface 11a, which is one of the pair of seal surfaces 11a, 11b of the pipe member 11.

[0062] As a result, the seal surface 10a of the pipe member 10 and the seal surface 11a of the pipe member 11 are connected by the third seal portion 21f of the first connecting portion 21 and the second seal portion 22a of the second connecting portion 22.

[0063] As described above (Relationship between pipe members and windshield, front door and rear door), when the front door 18 is operated to the closed position and the seal member 26 of the front door 18 contacts the seal surfaces 10a, 11a of the pipe members 10, 11 and the outer surface of the frame 13, the seal member 26 also contacts the third seal portion 21f of the first connecting portion 21 and the second seal portion 22a of the second connecting portion 22.

[0064] By connecting the first connecting portion 21 and the second connecting portion 22, the first seal portion 21a of the first connecting portion 21 is continuous with the other of the pair of seal surfaces 11a, 11b of the pipe member 11, that is, the seal surface 11b.

[0065] As described above (Relationship between pipe members and windshield, front door and rear door), when the sealing member 28 of the windshield 8 contacts the sealing surfaces 11b of the right and left pipe members 11, the sealing member 28 also contacts the first sealing portion 21a of the first connecting portion 21.

[0066] By connecting the first connecting portion 21 and the second connecting portion 22, the third unsealed portion 21h of the first connecting portion 21 and the second unsealed portion 22b of the second connecting portion 22 are continuous. As described above (connected state of the previous coupling member), the first non-sealed portion 21b of the first connecting portion 21 is continuous with the non-sealed surface 10d, which is the other of the pair of non-sealed surfaces 10c, 10d, of the pipe member 10. The third non-sealed portion 21h of the first connecting portion 21 is continuous with the non-sealed surface 10c, which is one of the pair of non-sealed surfaces 10c, 10d, of the pipe member 10. The second non-sealed portion 22b of the second connecting portion 22 is continuous with the non-sealed surface 11c, which is one of the pair of non-sealed surfaces 11c, 11d, of the pipe member 11.

[0067] As a result, the non-sealed surface 10c of the pipe member 10 and the non-sealed surface 11c of the pipe member 11 are connected by the third non-sealed portion 21h of the first connecting portion 21 and the second non-sealed portion 22b of the second connecting portion 22. The non-sealed surface 10d of the pipe member 10 and the non-sealed surface 11d of the pipe member 11 are connected by the first non-sealed portion 21b of the first connecting portion 21.

[0068] (Configuration of later joint member) As shown in FIGS. 1 to 4, a rear joint member 30 that connects the upper rear end of the pipe member 10 and the lower rear end of the pipe member 12 is provided with a first connecting portion 31 and a second connecting portion 32.

[0069] As shown in Figures 5, 6, 10, 11, and 12, the first connecting portion 31 has a first sealing portion 31a, a first non-sealing portion 31b, and a connecting portion 31c, and a recess 21e is formed in the first contact surface 31d between the first sealing portion 31a and the first non-sealing portion 31b.

[0070] The second connecting portion 32 has a second sealed portion 32a, a second non-sealed portion 32b, and a connecting portion 32c, and a convex portion 32e is formed on a second contact surface 32d between the second sealed portion 32a and the second non-sealed portion 32b.

[0071] As a result, as shown in Figure 10, when the first connecting portion 31 and the second connecting portion 32 are overlapped, a convex portion 32e having a triangular cross-section that protrudes toward the first contact surface 31d of the first connecting portion 31 in a cross-sectional view is provided on the second contact surface 32d of the second connecting portion 32, on the first contact surface 31d of the first connecting portion 31 that contacts the second connecting portion 32 and on the second contact surface 32d of the second connecting portion 32 that contacts the first connecting portion 31.

[0072] A recess 31e having a triangular cross section into which the protrusion 32e of the second connecting portion 32 fits when viewed in cross section is provided on the first contact surface 31d of the first connecting portion 31, and the recess 31e of the first connecting portion 31 is formed so as to fit from the first contact surface 31d of the first connecting portion 31 into the first non-sealed portion 31b when viewed in cross section.

[0073] (Connection state of rear joint member) As shown in Figures 5, 6, 10, 11, and 12, the connecting portion 31c of the first connecting portion 31 is connected to the upper rear end of the pipe member 10, which is one of the pipe members, and the connecting portion 32c of the second connecting portion 32 is connected to the lower rear end of the pipe member 12, which is the other pipe member.

[0074] When the first connecting portion 31 is connected to the pipe member 10, the first sealing portion 31a of the first connecting portion 31 is continuous with the sealing surface 10a, which is one of the pair of sealing surfaces 10a, 10b of the pipe member 10. The first non-sealing portion 31b of the first connecting portion 31 is continuous with the non-sealing surface 10d, which is one of the pair of non-sealing surfaces 10c, 10d of the pipe member 10.

[0075] When the second connecting portion 32 is connected to the pipe member 12, the second sealing portion 32a of the second connecting portion 32 is continuous with the other of the pair of sealing surfaces 12a, 12b of the pipe member 12, that is, the sealing surface 12b. The second non-sealing portion 32b of the second connecting portion 32 is continuous with the other of the pair of non-sealing surfaces 12c, 12d of the pipe member 12.

[0076] As described above (Configuration of the coupling member below), in the coupling member 30, when the first connecting portion 31 is connected to the pipe member 10 and the second connecting portion 32 is connected to the pipe member 12, the first connecting portion 31 (first contact surface 31d) and the second connecting portion 32 (second contact surface 32d) are overlapped, as shown in Figures 10 and 11.

[0077] When the first connecting portion 31 and the second connecting portion 32 are overlapped, the convex portion 32e of the second connecting portion 32 fits into the concave portion 31e of the first connecting portion 31, and the first connecting portion 31 and the second connecting portion 32 are connected by the bolt 34.

[0078] In this case, the bolt 34 is connected across the first non-sealed portion 31b of the first connecting portion 31 and the second non-sealed portion 32b of the second connecting portion 32 so as to pass through the convex portion 32e of the second connecting portion 32 and the concave portion 31e of the first connecting portion 31 in a cross-sectional view, and to intersect obliquely with the first contact surface 31d of the first connecting portion 31 and the second contact surface 32d of the second connecting portion 32.

[0079] As described above, by connecting the first connecting portion 31 and the second connecting portion 32 in the joint member 30, the upper rear end portion of the pipe member 10 and the lower rear end portion of the pipe member 12 are connected by the joint member 30 (the first connecting portion 31 and the second connecting portion 32) in a state where they face each other.

[0080] (Positional relationship between rear joint member and pipe member) As shown in Figures 5, 6, 10, and 12, when the first connecting portion 31 and the second connecting portion 32 of the coupling member 30 are connected, the positional relationship between the first connecting portion 31 and the second connecting portion 32 of the coupling member 30 and the pipe members 10 and 12 becomes as described below.

[0081] By connecting the first connecting portion 31 and the second connecting portion 32, the first seal portion 31a of the first connecting portion 31 and the seal surface 12a, which is one of the pair of seal surfaces 12a, 12b of the pipe member 12, are connected.

[0082] As described above (later, the connected state of the joint member), the first seal portion 31a of the first connecting portion 31 is continuous with the seal surface 10a, which is one of the pair of seal surfaces 10a, 10b of the pipe member 10. As a result, the seal surface 10a of the pipe member 10 and the seal surface 12a of the pipe member 12 are connected by the first seal portion 31a of the first connecting portion 31.

[0083] As described above (Relationship between pipe members and windshield, front door and rear door), when the rear door 19 is operated to the closed position and the sealing member 27 of the rear door 19 contacts the sealing surfaces 10a, 12a of the pipe members 10, 12, the sealing member 27 also contacts the first sealing portion 31a of the first connecting portion 31.

[0084] By connecting the first connecting portion 31 and the second connecting portion 32, the second seal portion 32a of the second connecting portion 32 and the other of the pair of seal surfaces 10a, 10b of the pipe member 10 are connected to each other.

[0085] As described above (later, the connected state of the joint member), the second seal portion 32a of the second connecting portion 32 is continuous with the other of the pair of seal surfaces 12a, 12b of the pipe member 12, that is, the seal surface 12b. As a result, the seal surface 10b of the pipe member 10 and the seal surface 12b of the pipe member 12 are connected by the second seal portion 32a of the second connecting portion 32.

[0086] As described above (Relationship between the pipe members and the windshield, front door and rear door), when the rear windshield 9 is operated to the closed position and the sealing member 29 of the rear windshield 9 contacts the sealing surfaces 10b, 12b of the pipe members 10, 12, the sealing member 29 also contacts the second sealing portion 32a of the second connecting portion 32.

[0087] By connecting the first connecting portion 31 and the second connecting portion 32, the first non-sealed portion 31b of the first connecting portion 31 is connected to the non-sealed surface 12d of the pipe member 12. The second non-sealed portion 32b of the second connecting portion 32 is connected to the non-sealed surface 10c of the pipe member 10.

[0088] As described above (connected state of the coupling members later), the first non-sealed portion 31b of the first connecting portion 31 is continuous with the non-sealed surface 10d, which is one of the pair of non-sealed surfaces 10c, 10d of the pipe member 10. The second non-sealed portion 32b of the second connecting portion 32 is continuous with the non-sealed surface 12c, which is the other of the pair of non-sealed surfaces 12c, 12d of the pipe member 12.

[0089] As a result, the non-sealed surface 10c of the pipe member 10 and the non-sealed surface 12c of the pipe member 12 are connected by the second non-sealed portion 32b of the second connecting portion 32. The non-sealed surface 10d of the pipe member 10 and the non-sealed surface 12d of the pipe member 12 are connected by the first non-sealed portion 31b of the first connecting portion 31.

[0090] (Connecting structure of pipe members and frames in ROPS frames) The connecting portion between the upper rear end of pipe member 11, which is the first pipe member, the upper front end of pipe member 12, which is the second pipe member, the upper end of frame 13, which is the first frame, and the right (left) end of frame 14, which is the second frame, will be described below.

[0091] 2, 3, 5, 6 and 13 to 16, a plate-shaped first joint member 41 is connected by welding to the upper rear end of the pipe member 11 so as to be perpendicular to the longitudinal direction of the upper part of the pipe member 11. A plate-shaped second joint member 42 is connected by welding to the upper front end of the pipe member 12 so as to be perpendicular to the longitudinal direction of the upper part of the pipe member 12.

[0092] With the upper rear end of the pipe member 11 and the upper front end of the pipe member 12 facing each other, the first joint member 41 and the second joint member 42 are overlapped, and bolts 35 are attached across the first joint member 41 and the second joint member 42, and the first joint member 41 and the second joint member 42 are fastened together by the bolts 35. In this way, the upper rear end of the pipe member 11 and the upper front end of the pipe member 12 are connected via the first joint member 41, the second joint member 42, and the bolts 35.

[0093] The frame 13 is arranged along the vertical direction intersecting with the upper parts of the pipe members 11 and 12, and the upper end of the frame 13 is arranged so as to face the upper rear end of the pipe member 11 and the upper front end of the pipe member 12.

[0094] The frame 14 is arranged along the left-right direction intersecting with the upper parts of the pipe members 11 and 12 and with the upper part of the frame 13, and the right (left) end of the frame 14 is arranged so as to face the upper rear end of the pipe member 11 and the upper front end of the pipe member 12.

[0095] A connecting member 36 (see Figure 17) is provided, and the upper rear end of the pipe member 11, the upper front end of the pipe member 12, the upper end of the frame 13, and the right (left) end of the frame 14 are connected by the connecting member 36 as described below in (Structure of the connecting member), (Connection by the connecting member), and (Connection state of the connecting member).

[0096] (Structure of connecting members) 17, the connecting member 36 is formed by bending a plate material. The connecting member 36 is provided with four connecting portions 36a, 36b, 36c, and 36d, and is provided with a connection portion 36e spanning connecting portions 36a and 36c, a connection portion 36f spanning connecting portions 36b and 36c, a connection portion 36g spanning connecting portions 36a and 36d, and a connection portion 36h spanning connecting portions 36b and 36d.

[0097] In the connecting member 36, the connecting portions 36a and 36b are bent into a concave shape. The connecting portions 36a and 36b are spaced apart from each other, and the connecting portions 36e and 36g and the connecting portions 36f and 36h are spaced apart from each other, so that spaces are formed between the connecting portions 36a and 36b and between the connecting portions 36e and 36g and the connecting portions 36f and 36h.

[0098] (Connection by connecting members) 13 to 17, collars 37 and 38 are connected by welding to the upper end of frame 13. The right (left) end of frame 14 is connected to collar 37 with bolt 39, and the upper end of frame 13 and the right (left) end of frame 14 are connected to each other.

[0099] A first auxiliary connecting member 43 and a second auxiliary connecting member 44 are provided, each formed by bending a plate material. The first auxiliary connecting member 43 is connected to the upper rear end of the pipe member 11 by welding, and the second auxiliary connecting member 44 is connected to the upper front end of the pipe member 12 by welding.

[0100] The connecting portion 36c of the connecting member 36 is connected to the collar 38 by a bolt 40, and is connected to the upper end of the frame 13. The connecting portion 36d of the connecting member 36 is connected to the right (left) end of the frame 14 by a bolt 47.

[0101] The upper rear end of the pipe member 11 is fitted into the connecting portion 36a of the connecting member 36, and a bolt 45 is connected between the connecting portion 36a of the connecting member 36 and the first auxiliary connecting member 43, so that the upper rear end of the pipe member 11 is connected to the connecting portion 36a of the connecting member 36.

[0102] The upper front end of the pipe member 12 is fitted into the connecting portion 36b of the connecting member 36, and a bolt 46 is connected between the connecting portion 36b of the connecting member 36 and the second auxiliary connecting member 44, so that the upper front end of the pipe member 12 is connected to the connecting portion 36b of the connecting member 36.

[0103] As a result, the connecting member 36 (connecting portions 36a, 36b) and the first auxiliary connecting member 43 (second auxiliary connecting member 44) are wrapped around the upper rear end portion of the pipe member 11 (upper front end portion of the pipe member 12) from the outside, and the connecting member 36 (connecting portions 36a, 36b) is connected to the upper rear end portion of the pipe member 11 (upper front end portion of the pipe member 12). In this case, the first auxiliary connecting member 43 does not have to be connected to the upper rear end of the pipe member 11. The second auxiliary connecting member 44 does not have to be connected to the upper front end of the pipe member 12.

[0104] (Connection state of connecting members) As described above (Structure of connecting member) (Connection by connecting member) and as shown in Figures 13 to 17, connecting member 36 (connecting portions 36a, 36c and connection portion 36e) connects the upper rear end of pipe member 11 to the upper end of frame 13, and connecting member 36 (connecting portions 36b, 36c and connection portion 36f) connects the upper front end of pipe member 12 to the upper end of frame 13.

[0105] The connecting member 36 (connecting portions 36a, 36d and connecting portion 36g) is connected between the upper rear end of the pipe member 11 and the right (left) end of the frame 14, and the connecting member 36 (connecting portions 36b, 36d and connecting portion 36h) is connected between the upper front end of the pipe member 12 and the right (left) end of the frame 14.

[0106] As described above (Structure of the Connecting Member), in the connecting member 36, the connecting portion 36a and the connecting portion 36b are spaced apart from each other, and the connecting portions 36e, 36g and the connecting portions 36f, 36h are spaced apart from each other. An opening 14a (see FIG. 5) is formed at the right (left) end of the frame 14.

[0107] The portion where the upper rear end of the pipe member 11 faces the upper front end of the pipe member 12 (first joint member 41 and second joint member 42, bolt 35) is arranged between the connecting portion 36a and the connecting portion 36b of the connecting member 36, and between the connecting portions 36e, 36g and the connecting portions 36f, 36h of the connecting member 36, and enters the opening 14a of the frame 14.

[0108] Hereinafter, an embodiment of the present invention will be described. In this case, only the differences between the embodiment of the present invention and the above-described embodiment will be described, and the remaining differences are the same as those of the above-described embodiment. (Embodiments of the present invention) The connection structure between the upper rear end of the pipe member 11 and the upper front end of the pipe member 12 by the first joint member 41 and the second joint member 42 may be configured as described below.

[0109] As shown in FIG. 18, with the upper rear end of the pipe member 11 and the upper front end of the pipe member 12 butted against each other, a plate-shaped first joint member 41 is fitted over the non-sealed surface 11c (outer surface) of the upper rear end of the pipe member 11 and the non-sealed surface 12c (outer surface) of the upper front end of the pipe member 12.

[0110] A plate-shaped second joint member 42 is attached across the non-seal surface 11d (outer surface) of the upper rear end of the pipe member 11 and the non-seal surface 12d (outer surface) of the upper front end of the pipe member 12. The first joint member 41 and the second joint member 42 are arranged on opposite sides of the pipe members 11, 12 in a cross-sectional view.

[0111] Inside the upper rear end of the pipe member 11, a cylindrical first collar 51 is attached across the portion facing the first joint member 41 (non-seal surface 11c) and the portion facing the second joint member 42 (non-seal surface 11d). Inside the upper front end of the pipe member 12, a cylindrical second collar 52 is attached across the portion facing the first joint member 41 (non-seal surface 12c) and the portion facing the second joint member 42 (non-seal surface 12d).

[0112] A first bolt 53 is attached through the inside of the first collar 51 across the first joint part 41 and the second joint part 42, and the first bolt 53 tightens the first joint part 41 and the second joint part 42 so that they approach each other. A second bolt 54 is attached through the inside of the second collar 52 across the first joint part 41 and the second joint part 42, and the second bolt 54 tightens the first joint part 41 and the second joint part 42 so that they approach each other.

[0113] With the above configuration, the upper rear end of the pipe member 11 and the upper front end of the pipe member 12 are connected by the first joint member 41, the second joint member 42, the first bolt 53 and the second bolt 54.

[0114] 14 and 15, the first joint part 41 and the second joint part 42 may be configured as a cylindrical plate member. In this configuration, one portion of the cylindrical member becomes the first joint part 41, and the other portion that is 180 degrees out of phase with the first joint part 41 becomes the second joint part 42.

[0115] (First Alternative Embodiment of the Invention) In the configuration described above (embodiment of the present invention) and shown in FIG. 18, when the frames 13 and 14 shown in FIGS. 13 to 16 are provided, the configuration may be as described below.

[0116] 19, a connecting portion 41a is provided extending downward from the first joint member 41, and the connecting portion 41a of the first joint member 41 is connected to the collar 38 (frame 13) by a bolt 40. A connecting portion 42a is provided extending laterally from the second joint member 42, and the connecting portion 42a of the second joint member 42 is connected to the frame 14 by a bolt 47.

[0117] In the frame 13, the collar 37 (see Figures 14 and 15) has been eliminated, and a boss portion 48 having a female thread formed thereon is connected to the upper end of the frame 13 by welding, and the frame 14 is connected to the boss portion 48 (frame 13) by a bolt 39. As a result, the function of the connecting member 36 shown in FIGS. 13 to 17 is provided to the first joint part 41 and the second joint part 42, and the connecting member 36 as a separate part becomes unnecessary.

[0118] (Second Alternative Embodiment of the Invention) The connection structure between the upper rear end of the pipe member 11 and the upper front end of the pipe member 12 by the first joint member 41 and the second joint member 42 may be configured as described below.

[0119] 20, one portion of a plate-shaped first coupling part 41, which is a coupling part, is connected by welding to the inner surface of the upper rear end part (non-seal surface 11c) of the pipe part 11, and the other portion of the first coupling part 41 protrudes from the upper rear end part of the pipe part 11. A nut 49 is connected by welding to the inner surface of the other portion of the first coupling part 41.

[0120] One portion of a plate-shaped second coupling member 42, which is a coupling member, is connected by welding to the inner surface of the upper rear end portion (non-seal surface 11d) of the pipe member 11, and the other portion of the second coupling member 42 protrudes from the upper rear end portion of the pipe member 11. A nut 49 is connected by welding to the inner surface of the other portion of the second coupling member 42. The first coupling member 41 and the second coupling member 42 are arranged on opposite sides of the pipe members 11, 12 in a cross-sectional view.

[0121] The other part of the first joint member 41 and the other part of the second joint member 42 are inserted into the upper front end of the pipe member 12, and the upper rear end of the pipe member 11 and the upper front end of the pipe member 12 are butted together. Bolts 50 are attached to the nuts 49 of the first joint member 41 and the nuts 49 of the second joint member 42 from the outside of the upper front end of the pipe member 12, thereby tightening the pipe member 12 to the first joint member 41 and the second joint member 42. With the above-described configuration, the upper rear end of the pipe member 11 and the upper front end of the pipe member 12 are connected by the first joint member 41, the second joint member 42, the bolt 50 and the nut 49.

[0122] (Third Alternative Embodiment of the Invention) 20 , one portion of the first coupling member 41 and one portion of the second coupling member 42 may be connected to the inner surface of the upper front end portion (non-sealed surface 12c) of the pipe member 12 by welding, and the other portion of the first coupling member 41 and the other portion of the second coupling member 42 may protrude from the upper front end portion of the pipe member 12. With this configuration, the pipe member 12 becomes the first pipe member 12, and the pipe member 11 becomes the second pipe member 11.

[0123] In the above-described (second alternative embodiment of the invention) and in FIG. 20 , when one portion of the first coupling member 41 is connected to the inner surface of the upper rear end portion (non-sealed surface 11 c) of the pipe member 11, one portion of the second coupling member 42 may be connected to the inner surface of the upper front end portion of the pipe member 12, and the other portion of the second coupling member 42 may be configured to protrude from the upper front end portion of the pipe member 12.

[0124] If the cross-sectional shape of the pipe members 11, 12 is circular rather than the shape shown in Figures 14 and 15, a third coupling member and a nut may be added in addition to the first coupling member 41 and the second coupling member 42, or a fourth coupling member and a nut may be added.

[0125] 14 and 15, the first joint part 41 and the second joint part 42 may be configured in the shape of a cylindrical plate material. In this configuration, one portion of the cylindrical member becomes the first joint part 41, and the portion that is out of phase with the first joint part 41 becomes the second joint part 42, which in turn becomes the third joint part and the fourth joint part.

[0126] (Fourth Alternative Embodiment of the Invention) As shown in FIGS. 13 to 16, when the first joint member 41 and the second joint member 42 are not provided around the entire circumference of the ends of the pipe members 11, 12, the connection structure between the upper rear end of the pipe member 11 and the upper front end of the pipe member 12 by the first joint member 41 and the second joint member 42 may be configured as described below.

[0127] As shown in FIG. 21, a first joint member 41 and a second joint member 42, each of which is a plate-like member with an angular cross section and a size of about a quarter circle, are connected by welding to the outer surfaces of the ends of the pipe members 11 and 12 so as to be perpendicular to the longitudinal direction of the pipe members 11 and 12.

[0128] A plate-shaped third joint member 55 is arranged along the longitudinal direction of the pipe members 11 and 12, one part of the third joint member 55 is connected to the outer surface of the upper rear end of the pipe member 11 by welding, and the other part of the third joint member 55 protrudes from the upper rear end of the pipe member 11. A plate-shaped fourth joint member 56 is disposed along the longitudinal direction of the pipe members 11, 12 and is connected to the outer surface of the upper front end of the pipe member 12 by welding.

[0129] With the upper rear end of the pipe member 11 and the upper front end of the pipe member 12 facing each other, the first joint member 41 and the second joint member 42 are overlapped, and bolts 35 are attached across the first joint member 41 and the second joint member 42, and the first joint member 41 and the second joint member 42 are fastened together by the bolts 35.

[0130] The other portion of the third joint member 55 and the fourth joint member 56 are overlapped with each other, and a bolt 57 is attached across the third joint member 55 and the fourth joint member 56, and the third joint member 55 and the fourth joint member 56 are fastened together by the bolt 57.

[0131] As a result, the upper rear end of the pipe member 11 and the upper front end of the pipe member 12 are connected via the first joint member 41, the second joint member 42, the third joint member 55, the fourth joint member 56, and the bolts 35 and 57. In this case, the third joint member 55 may be connected to the pipe member 12 and the fourth joint member 56 may be connected to the pipe member 11 .

[0132] (Fifth Alternative Embodiment of the Invention) The connection structures of the first joint member 41 and the second joint member 42 shown in Figures 13 to 16 and the connection structures of the first joint member 41 and the second joint member 42 in (Embodiment of the invention) to (Third alternative embodiment of the invention) may be used in the connection portion between the upper-front end portion of the pipe member 10 and the lower-front portion of the pipe member 11, or may be used in the connection portion between the upper-rear end portion of the pipe member 10 and the lower-rear portion of the pipe member 12. The connecting structure of the joint members 20, 30 shown in FIGS. 7 to 12 may be employed in the connecting portion between the upper rear end of the pipe member 11 and the upper front end of the pipe member 12. [Industrial Applicability]

[0133] The present invention can be applied not only to multipurpose work vehicles but also to riding mowers, tractors, and the like. [Explanation of symbols]

[0134] 7 Rops Frame 11 Pipe member (first pipe member) 12 Pipe member (second pipe member) 13 frames (1st frame) 14 frames (2nd frame) 36 Connecting member 41 First joint member 42 Second joint member 43 First auxiliary connecting member 44 Second auxiliary connecting member 51 First Color 52 Second Color 53 First Bolt 54 Second Bolt

Claims

1. A rope frame for a work vehicle configured with a plurality of pipe members, Among the plurality of pipe members, a first pipe member and a second pipe member whose ends face each other, a plate-shaped first coupling member fitted across an outer surface of the end of the first pipe member and an outer surface of the end of the second pipe member; and a plate-shaped second coupling member fitted across an outer surface of the end of the first pipe member and an outer surface of the end of the second pipe member, the first coupling member and the second coupling member are disposed on opposite sides of the pipe member in a cross-sectional view, a first collar attached to the first pipe member across a portion thereof facing the first joint member and a portion thereof facing the second joint member, and a second collar attached to the second pipe member across a portion thereof facing the first joint member and a portion thereof facing the second joint member, a first bolt that is attached through the inside of the first collar across the first joint member and the second joint member and tightens the first joint member and the second joint member so as to bring the first joint member and the second joint member closer to each other; a second bolt is provided that is attached through the inside of the second collar across the first coupling member and the second coupling member and tightens the first coupling member and the second coupling member so as to bring them closer to each other; a first frame is provided, the first frame being arranged along a direction intersecting the first pipe member and the second pipe member, and having an end portion arranged to face an end portion of the first pipe member and an end portion of the second pipe member; A rope frame for a work vehicle, comprising a connecting member that connects the end of the first pipe member to the end of the first frame, and that connects the end of the second pipe member to the end of the first frame.

2. a second frame is provided, the second frame being disposed along a direction intersecting the first pipe member and the second pipe member and intersecting the first frame, and having an end portion disposed so as to face an end portion of the first pipe member and an end portion of the second pipe member; A ROPS frame for a work vehicle as described in claim 1, wherein the connecting member is connected between the end of the first pipe member and the end of the second frame, and between the end of the second pipe member and the end of the second frame.

3. 3. The ROPS frame of a work vehicle according to claim 2, wherein an end of the first frame and an end of the second frame are connected to each other.

4. a portion where the connecting member is connected to the end of the first pipe member and a portion where the connecting member is connected to the end of the second pipe member are spaced apart from each other; A ROPS frame of a work vehicle described in any one of claims 1 to 3, wherein the portion where the end of the first pipe member and the end of the second pipe member face each other is positioned between the portion where the connecting member is connected to the end of the first pipe member and the portion where the connecting member is connected to the end of the second pipe member.

5. the connecting member is abutted against the outer surface of the end of the first pipe member, and a first auxiliary connecting member is abutted against the outer surface of the end of the first pipe member and connected to the connecting member, thereby connecting the connecting member to the end of the first pipe member, A ROPS frame for a work vehicle as described in any one of claims 1 to 4, wherein the connecting member is abutted against the outer surface of the end of the second pipe member, and a second auxiliary connecting member is abutted against the outer surface of the end of the second pipe member and connected to the connecting member, thereby connecting the connecting member to the end of the second pipe member.

6. A work vehicle equipped with the ROP frame described in any one of claims 1 to 5.

Images