Device for hose fitting
A system for coupling at least one flexible hose is provided that includes first and second annular connecting elements. In a system mounting position, the second element is inserted partially into the flexible hose and the first element is mounted on the second element to compress the flexible hose. The first element includes a tubular body, and a proximal end having an annular part. The tubular body is divided from the annular part by axially extending openings that form at least two hooking portions with hook-shaped ends. The second element includes a first sealing projection and a second retaining projection formed beyond the first sealing projection. The second projection cooperates with the hooking portions. More specifically, the annular part comprises an annular inner protrusion to form a constriction between a bottom and top of the sealing projection side facing the said first end of the second element.
1. A system for coupling at least a flexible hose, the system comprising:
a first annular connecting element comprising a tubular body, the tubular body including a proximal end having an annular part, wherein the tubular body is divided from the annular part by axially extending openings into at least two hooking portions in the form of axially extending tube fractions allowing the body to expand elastically, wherein each axially extending tube fraction includes a distal hook-shaped end; and
a second annular connecting element comprising: from a first end, a first sealing projection; and a second retaining projection formed beyond the first sealing projection, wherein the second retaining projection is adapted to cooperate with the hooking portions of the tubular body,
wherein, in a system mounting position, the second annular connecting element is partially inserted into the flexible hose and the first annular connecting element is mounted on the second annular connecting element to compress the flexible hose between the first and second annular connecting elements,
wherein the annular part of the proximal end of the tubular body includes an annular inner protrusion, the annular inner protrusion comprising:
an annular surface arranged to form a first substantially radially-oriented constriction with an outer annular surface of the second annular connecting element located between the first sealing projection and the first end of the second annular connecting element, wherein said first constriction is formed between two substantially rectilinear shaped profiles in axial cross-section of the first and the second elements, wherein a first profile comprises an inner surface of the first element and a second profile comprises an outer surface of the second element; and
a rounded edge arranged to form a second substantially obliquely-oriented constriction with a sealing projection surface facing toward the first end of the second annular connecting element.
2. The system according to claim 1 , wherein the second obliquely-oriented constriction is configured to create a compression of the hose in a substantially oblique direction to said axially reference.
3. The system according to claim 1 , wherein the first radially-oriented constriction is configured to create a compression of the hose in a substantially radial direction.
4. The system according to claim 1 , wherein the first annular connecting element further comprises a step between the annular inner protrusion and the hooking portions which defines the rounded edge extending in front of the sealing projection surface to form the second obliquely-oriented constriction.
5. The system according to claim 1 , wherein the first and second annular connecting elements are shaped to deform and wrap the flexible hose around the first sealing projection.
6. The system according to claim 1 , wherein the second obliquely-oriented constriction is formed between two round-shaped inner profiles in axial cross-section of the first and second annular connecting elements.
7. The system according to claim 1 , wherein the first end of the second annular connecting element is provided with a chamfer in order to facilitate inserting the said first end into the flexible hose.
8. The system according to claim 1 , wherein at least one of the first annular connecting element and the second annular connecting element is made of plastic or metal.
9. The system according to claim 1 , wherein each hooking portion has a circumferential width smaller than that of each axially extending opening.
10. The system according to claim 1 further comprising a plurality of hooking portions and a matching number of axially extending openings are regularly or irregularly spaced in relation to each other.
11. The system according to claim 1 , wherein four hooking portions and four axially extending openings are regularly spaced in relation to each other.