Patent EA-004008-B1 (EA)
Title: Connecting fitting for peripherally ribbed longitudinal bodies with a locking retain-protecting element
Inventor: BARTHOLOMAE MARIO
IPC: F16L37/088
Filed: 2001-06-29
Abstract: 1. A connecting fitting (1) used for fixing peripherally ribbed longitudinal bodies such as tubes, hoses or cables, in particular for corrugated hoses (2), comprising a retaining bushing (3) into which the longitudinal body or corrugated hose (2) can be inserted in an axial direction and anchored by means of at least one locking, retaining, projecting element which, when insertion occurs, is radially offset in an outer direction and engages with a recess running along the periphery of the longitudinal body or corrugated hose (2), for instance a corrugated trough (2a), wherein a retaining ring (4) which is fixed in an axial direction inside the retaining bushing (3) is used as a retaining projecting element, said ring can be expanded in an elastic manner in a radial direction until the inner diameter thereof is at least as large as the largest outer diameter of the longitudinal body or an undulation of the corrugated hose (2), the retaining ring (4) can be offset when the corrugated hose (2) is inserted and can engage with a recess or a corrugated trough (2a), characterized in that a slit (5) width of the retaining ring (4) is designed so that when two limits (5a) of the slit (5) mutually touch the outer diameter of the retaining ring (4) is equal or greater of the narrowest area (6) of the retaining bushing (3) in the direction of extraction of the longitudinal body or corrugated hose (2). 2. A connecting fitting according to claim 1, characterized in that the retaining ring (4) is interrupted by a slit (5) radially or in an inclined direction. 3. A connecting fitting according to claim 1 or 2, characterized in that facing the longitudinal body or corrugated hose (2) the retaining ring (4) end decreases obliquely, at least in the part of its radial width, to the middle (M) of the retaining ring (4), in particular having conic or funnel-shaped surface. 4. A connecting fitting according to any one of claims 1 to 3, characterized in that the thickness or the axial size of the retaining ring (4) in its inner side or on its inner diameter is less than the axial diameter of the corrugated hose (2) trough (2a), and its maximum thickness is greater than the axial size of recess or corrugated trough (2a). 5. A connecting fitting according to any one of claims 1 to 4, characterized in that the retaining ring on its end facing the insert has a decreasing thickness in the direction of its greatest diameter, in particular an oblique surface or a cone (4b), and a sitting area in the retaining bushing (3) is made in the form of circular groove (7), the limit (8) is at least beveled on the side of that oblique surface (4b) of the retaining ring (4) wherein the diameter of the circular groove (7) is at least as bigger the diameter of the retaining ring (4) that the retaining ring (4), when inserting the longitudinal body or corrugated hose (2) or extracting the longitudinal body or corrugated hose (2), occurs with its inner diameter on the most outer diameter of peripheral rib or corrugation, being embraced by the retaining ring in an operative position. 6. A connecting fitting according to any one of claims 1 to 5, characterized in that a separating tool (10) is arranged on the retaining bushing (3) said tool serves for expanding the retaining ring (4) against its elastic reset action. 7. A connecting fitting according to any one of claims 1 to 6, characterized in that the separating tool (10) is designed in the form of a cover-like closing element for the retaining bushing (3), in particular, on the side of the longitudinal body or corrugated hose (2), wherein the closing element is provided with a shoulder or a connecting pipe (11) or separate pins, preferably conical, directed inwards into the retaining bushing, on free, lying axially end or edge, which loads or embraces directed radially inwards the oblique or funnel-shaped surface (4a) of the retaining ring (4) when at least pressing upon the separating tool (10), wherein the axial mobility of said separating tool (10) and an angle or angles of interacting oblique surfaces are chosen for possible radial pulling out of the retaining ring (4) from the zone of a corrugated trough (2a). 8. A connecting fitting according to claim 6 or 7, characterized in that the shoulder or the connecting pipe (11) of the separating tool (10) is provided with at least one protrusion projecting radially outwards, and the retaining bushing (4) is provided with a response protrusion (13) projecting radially inwards. 9. A connecting fitting according to any one of claims 1 to 8, characterized in that the retaining ring (4) lower side (4c), which is opposite to the insert direction, is also inclined inwards and, and extends inclined for preferably at least along the radial width, so that the ring section mainly conical between the corrugated trough (2a). 10. A connecting fitting according to any one of claims 1 to 9, characterized in that a second limit (8a), inverted from the beveled limit (8) of the circular groove (7), is flat and arranged in a radial plane, and the retaining ring (4) rests against said flat limit of the circular groove or adjacent to it at least during insertion with its radial outer edge section. 11. A connecting fitting according to any one of claims 1 to 10, characterized in that the retaining ring (4) is arranged axially such that it is blocked or protected from axial displacements to a maximum degree.