Joint and work vehicle

1 . A joint for a first pipe and a second pipe of a roll-over protective structure (ROPS) frame, the first and second pipes each comprising on an outer side:

a first sealing surface and a second sealing surface each for contact with a sealer and opposite to each other in a cross-sectional view; and

a first non-sealing surface and a second non-sealing surface opposite to each other in a cross-sectional view and each disposed between the corresponding first and second sealing surfaces,

wherein the joint is configured to couple an end of the first pipe and an end of the second pipe to each other such that the respective ends of the first and second pipes face each other and such that the first and second sealing surfaces of the first pipe are continuous, respectively, with the first and second sealing surfaces of the second pipe,

the joint comprising:

a first coupling section configured to be coupled to the end of the first pipe; and

a second coupling section configured to be coupled to the end of the second pipe,

the first coupling section comprising:

a first sealing portion configured to be continuous with the first sealing surface or the second sealing surface of the first pipe; and

a first non-sealing portion configured to be continuous with the first non-sealing surface or the second non-sealing surface of the first pipe,

the second coupling section comprising:

a second sealing portion configured to be continuous with the first sealing surface or the second sealing surface of the second pipe; and

a second non-sealing portion configured to be continuous with the first non-sealing surface or the second non-sealing surface of the second pipe,

wherein the first and second coupling sections are configured to be coupled to each other with use of a bolt extending, with the first and second coupling sections placed on each other, from the first non-sealing portion to the second non-sealing portion in a cross-sectional view,

wherein the first coupling section has a first contact surface configured to, with the first and second coupling sections placed on each other, be in contact with the second coupling section, and the second coupling section has a second contact surface configured to, with the first and second coupling sections placed on each other, be in contact with the first coupling section, and

wherein the first contact surface and the second contact surface each comprise:

a first portion extending along a longitudinal direction of the bolt and orthogonally to a longitudinal direction of the first coupling section between the first non-sealing portion and the second non-sealing portion; and

a second portion connected to an end of the first portion and extending along a direction obliquely intersecting the bolt and a longitudinal direction of the second coupling section,

wherein the first contact surface extends beyond the first portion and the second portion of the first contact surface, and

wherein the second contact surface extends beyond the first portion and the second portion of the second contact surface.

2 . The joint according to claim 1 , wherein:

the second contact surface has a protrusion facing the first contact surface in a cross-sectional view and the protrusion is at least partially defined by the first portion of the second contact surface,

the protrusion extends along a longitudinal direction of the second contact surface,

the first contact surface has a depression configured to receive the protrusion in a cross-sectional view and the depression is at least partially defined by the first portion of the first contact surface, and

with the first and second coupling sections placed on each other, the protrusion is in the depression.

3 . The joint according to claim 2 , wherein the depression is a portion of the first contact surface which portion is depressed toward the first non-sealing portion in a cross-sectional view.

4 . The joint according to claim 2 , wherein the bolt extends from the first non-sealing portion to the second non-sealing portion through the protrusion and the depression in a cross-sectional view.

5 . A work vehicle, comprising:

a ROPS frame including a joint according to claim 1 .

6 . A joint for a first pipe and a second pipe of a roll-over protective structure (ROPS) frame, the first and second pipes each comprising on an outer side:

a first sealing surface and a second sealing surface each for contact with a sealer and opposite to each other in a cross-sectional view; and

a first non-sealing surface and a second non-sealing surface opposite to each other in a cross-sectional view and each disposed between the corresponding first and second sealing surfaces,

wherein the joint is configured to couple an end of the first pipe and an end of the second pipe to each other such that the respective ends of the first and second pipes face each other and such that the first and second sealing surfaces of the first pipe are continuous, respectively, with the first and second sealing surfaces of the second pipe,

the joint comprising:

a first coupling section configured to be coupled to the end of the first pipe; and

a second coupling section configured to be coupled to the end of the second pipe,

the first coupling section comprising:

a first sealing portion configured to be continuous with the first sealing surface or the second sealing surface of the first pipe; and

a first non-sealing portion configured to be continuous with the first non-sealing surface or the second non-sealing surface of the first pipe,

the second coupling section comprising:

a second sealing portion configured to be continuous with the first sealing surface or the second sealing surface of the second pipe; and

a second non-sealing portion configured to be continuous with the first non-sealing surface or the second non-sealing surface of the second pipe,

wherein the first and second coupling sections are configured to be coupled to each other with use of a bolt extending, with the first and second coupling sections placed on each other, from the first non-sealing portion to the second non-sealing portion in a cross-sectional view,

wherein the first coupling section has a first contact surface configured to, with the first and second coupling sections placed on each other, be in contact with the second coupling section, the second coupling section has a second contact surface configured to, with the first and second coupling sections placed on each other, be in contact with the first coupling section,

the bolt extends from the first non-sealing portion to the second non-sealing portion in such a manner as to obliquely cross the first and second contact surfaces in a cross-sectional view,

wherein the first contact surface and the second contact surface each comprise:

a first portion extending along a longitudinal direction of the bolt in a cross-sectional view along a diameter of the first and second pipes; and

a second portion connected to an end of the first portion and extending along a direction obliquely intersecting the bolt and a direction parallel to a longitudinal direction of the pipes.

7 . A joint for a first pipe and a second pipe of a roll-over protective structure (ROPS) frame, the first and second pipes each comprising on an outer side:

a first sealing surface and a second sealing surface each for contact with a sealer and opposite to each other in a cross-sectional view; and

a first non-sealing surface and a second non-sealing surface opposite to each other in a cross-sectional view and each disposed between the corresponding first and second sealing surfaces,

wherein the joint is configured to couple an end of the first pipe and an end of the second pipe to each other such that the respective ends of the first and second pipes face each other and such that the first and second sealing surfaces of the first pipe are continuous, respectively, with the first and second sealing surfaces of the second pipe,

the joint comprising:

a first coupling section configured to be coupled to the end of the first pipe; and

a second coupling section configured to be coupled to the end of the second pipe,

the first coupling section comprising:

a first sealing portion configured to be continuous with the first sealing surface or the second sealing surface of the first pipe; and

a first non-sealing portion configured to be continuous with the first non-sealing surface or the second non-sealing surface of the first pipe,

the second coupling section comprising:

a second sealing portion configured to be continuous with the first sealing surface or the second sealing surface of the second pipe; and

a second non-sealing portion configured to be continuous with the first non-sealing surface or the second non-sealing surface of the second pipe,

wherein the first and second coupling sections are configured to be coupled to each other with use of a bolt extending, with the first and second coupling sections placed on each other, from the first non-sealing portion to the second non-sealing portion in a cross-sectional view,

wherein the first coupling section has a first contact surface configured to, with the first and second coupling sections placed on each other, be in contact with the second coupling section, and the second coupling section has a second contact surface configured to, with the first and second coupling sections placed on each other, be in contact with the first coupling section,

wherein the second contact surface has a protrusion from an end of the second contact surface toward the first non-sealing surface in a cross-sectional view along a diameter of the first and second pipes,

wherein the protrusion extends along a longitudinal direction of the second contact surface, and

the first contact surface has a depression from an end of the first contact surface toward the first non-sealing portion in the cross-sectional view along the diameter of the first and second pipes.

8 . The joint according to claim 7 , wherein an angle of the protrusion is a right angle in the cross-sectional view along the diameter of the first and second pipes.