Support Sleeve

Abstract

A support sleeve reinforces yielding pipes, in particular plastic pipes, in the clamping region of a fastening bracket. The invention is based on the object of improving a support sleeve of the type mentioned at the outset so that the support sleeve remains securely in place in the interior of the plastic pipe even in the case of diameter variations of the plastic pipe without any complex preliminary deforming being necessary such that the support sleeve is capable of being fixed in the pipe end by way of a simple snap-fit. The support sleeve is configured as a pipe portion, wherein the pipe portion has notches so that each notch has a resilient tongue-shaped portion which at one side is resiliently connected to the support sleeve and which at the end thereof that is opposite the connection point to the support sleeve, protrudes radially beyond the external diameter of the support sleeve, pointing outward such that the tongue-shaped portion has a pawl-type shape.

Claims

1-5. (canceled)

6. A support tube for a yielding pipe having a clamping region for a fastening bracket, the support tube being provided to reinforce the yielding pipe in the clamping region and the support tube comprising: a support sleeve configured as a pipe section having an outer diameter; a plurality of notches having respective resilient tongue-shaped sections; each of said tongue-shaped sections having a first end whereat the tongue-shaped section is resiliently connected to said support sleeve; the tongue-shaped section and said support sleeve conjointly defining a connection location at said first end whereat the tongue-shaped section is connected to the support sleeve; each of said tongue-shaped sections having a second end lying opposite said first end; each of said tongue-shaped sections having an end edge at the second end thereof; and, said end edge being directed radially outwardly beyond said outer diameter so as to cause the tongue-shaped section to have a pawl-like shape.

7. The support sleeve of claim 6, wherein each of said tongue-shaped sections has a rectangular shape; and, the end edge thereof has a width that is exactly as wide as the width of said connection location to the support sleeve.

8. The support sleeve of claim 6, wherein each of said tongue-shaped sections has a trapezoidal shape; and, the end edge has a width that is less than the width of said connection location to the support sleeve.

9. The support sleeve of claim 6, wherein each of said tongue-shaped sections has a trapezoidal shape; and, the end edge thereof has a width that is greater than the width of the connection location to the support sleeve.

10. The support sleeve of claim 6, wherein each of said tongue-shaped sections has a radially inward directed curvature at the region of the second end thereof.

11. The support sleeve of claim 6, wherein the yielding pipe is made of plastic.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The invention will now be described with reference to the drawings wherein:

[0019] FIG. 1 shows a support sleeve according to the invention in the installed state and in a partial longitudinal section;

[0020] FIG. 2 shows the support sleeve according to the invention in an axial plan view; and,

[0021] FIG. 3 shows a support sleeve according to the invention, having an end-side curvature, in a partial longitudinal section.

DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION

[0022] The support sleeve 1 shown in FIG. 1 is push-fitted into a plastic pipe 2. The plastic pipe 2 on the external circumference thereof has a profile 3 for fastening a hose (not shown here) having a bracket (likewise not shown here). The support sleeve 1 at a first end 4 of the support sleeve 1 has a tongue-shaped notch 5. The notch 5 at one end 6 is resiliently connected to the support sleeve 1; the notch 5 at the opposite end, protruding radially beyond the external diameter of the support sleeve 1, points outward and, by way of the end edge 7 of the notch 5, is supported on the plastic pipe 2. On account of the spring effect of the connection 6, a gap 8 between the support sleeve 1 and the plastic pipe 2 is capable of being bridged by the notch 5.

[0023] The support sleeve 1 is shown in an axial plan view in FIG. 2. The support sleeve 1 has four notches 5 which project outward in a resilient manner.

[0024] A notch 9 is shown in FIG. 3, the end 11 of the notch 9 that lies opposite a resilient connection 10 having a radially inward directed curvature 12. The relatively sharp-edged end 11 thus does not come into contact with a plastic pipe (not shown here).

[0025] The support sleeve 1 in FIG. 4 has four tongue-shaped notches 13 which have a trapezoidal shape, wherein the notches 13 at one end 14 are resiliently connected to the support sleeve 1, and the notches 13 at that end that lies opposite the end 14 have an end edge 15, wherein the end edge 15 is narrower than the resilient connection 14. Only three notches 13 are visible in this illustration.

[0026] A spring tension in the notch 13 which is distributed in an almost uniform manner across the entire notch 13 is achievable on account of this trapezoidal configuration of the notch 13. The larger width of the notch 13 in the region of the resilient connection 14 has the effect that kinking of the notch 13 is avoidable.

[0027] The support sleeve 1 in FIG. 5 has four tongue-shaped notches 17 which have a trapezoidal shape, wherein the notches 17 at one end 18 are resiliently connected to the support sleeve 1, and the notches 17 at that end that lies opposite the end 18 have an end edge 19, wherein the end edge 19 is wider than the resilient connection 18. Only three notches 17 are visible in this illustration.

[0028] This arrangement has the advantage that lower spring tensions of the notches 17 are achievable in the case of more delicate configurations of the plastic pipe 2 (not shown here). At the same time, a lower surface contact pressure per unit area between the end edge 19 and the plastic pipe 2 is achievable on account of the larger width of the end edge 19 (of the notch 17) that is supported on the plastic pipe 2 (not shown).

[0029] It is understood that the foregoing description is that of the preferred embodiments of the invention and that various changes and modifications may be made thereto without departing from the spirit and scope of the invention as defined in the appended claims.

LIST OF REFERENCE NUMERALS

(Part of the Description)

[0030] 1 Support sleeve [0031] 2 Plastic pipe [0032] 3 Profile of the plastic pipe 2 [0033] 4 First end of the support sleeve 1 [0034] 5, 13, 17 Notch [0035] 6, 14, 18 Connection between the notch 5 and the support sleeve 1 [0036] 7, 15, 19 End edge of the notch 5 [0037] 8 Gap between the support sleeve 1 and the plastic tube 2 [0038] 9 Notch having a curvature [0039] 10 Resilient connection between the notch 9 and the support sleeve [0040] 11 Sharp-edged end of the notch 9 [0041] 12 Curvature of the notch 9