Pipe joints or couplings – Essential catch
Patent
1996-11-08
1999-01-12
Nicholson, Eric K.
Pipe joints or couplings
Essential catch
285319, F16L 3712
Patent
active
058577181
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed to an arrangement for the tight connection of a metal pipe to a receiving sleeve.
2. Description of the Preferred Embodiments
In many areas of technology, it is necessary to effect a fast, detachable and tight connection of a metal pipe, especially a metal pipe of small nominal dimensions, to a receiving sleeve which forms a component part of a stationary or movable unit, e.g., a housing, or which is fastened by its end to a line, in particular to a hose.
Previously, a one-piece plastic sleeve was used to connect a metal pipe of this type with a receiving sleeve, this plastic sleeve being tightly locked with the receiving sleeve. For this purpose, the plastic sleeve is glued to the metal pipe. In this arrangement of the end of the metal pipe, the use of different materials (metal, plastic) as well as the fact that the plastic sleeve is glued to the metal pipe is disadvantageous. This brings about substantial problems with respect to disposal and recycling. Furthermore, the gluing requires special drying times and curing times, especially when the connection is to be made in the area of high operating temperatures, e.g., between 100.degree. C. and 150.degree. C. This is the case, for instance, in the cooling system of a motor vehicle. Furthermore the majority of glues available for fixing plastic sleeves to metal pipes are toxic and accordingly pose considerable environmental problems. Moreover, the number of glues which can be used is limited by the fact that only a few glues withstand large temperature change stresses over a satisfactory period of time otherwise, premature aging will occur. However, premature aging will result in leaks, particularly in the cooling system of a motor vehicle engine. As a result, the connections between metal pipes and receiving sleeves will have to be changed repeatedly in the course of regular servicing during the normal lifetime of a motor vehicle.
SUMMARY OF THE INVENTION
Based on the prior art, the object of the present invention is to provide an arrangement for a tight connection of a metal pipe to a receiving sleeve which can be produced easily while avoiding environmental and disposal problems, has a long useful life and can also be readily exchanged subsequently with conventional arrangements.
In accordance with the present invention, the receiving sleeve has on an inner side thereof two diametrically oppositely located grooves which terminate at the end face of the receiving sleeve. The arrangement includes a plug-in sleeve of metal fastened on the metal pipe, wherein the plug-in sleeve is provided with radial projections for engagement in the grooves of the receiving sleeve. The receiving sleeve and the plug-in sleeve each have tangential slots for receiving a U-shaped clamp in order to couple the sleeves to each other detachably but rigidly with respect to pulling and pushing forces. The plug-in sleeve has a fixing portion with cylindrical inner and outer diameters, a cylindrical coupling portion having greater inner and outer diameters than the fixing portion, and a conically shaped transition portion with a uniform wall thickness, wherein the transition portion integrally connects the fixing portion and the coupling portion. The radial projections are substantially axially oriented tongues cut out of the coupling portion and extending at an angle relative to the coupling portion.
A plug-in sleeve made of metal which is placed on the end of a metal pipe. This plug-in sleeve is formed from a pipe portion by noncutting shaping. It is formed of three longitudinal portions, namely a cylindrical fixing portion, a cylindrical coupling portion and a conical transition portion between the fixing portion and the coupling portion.
The cylindrical fixing portion serves to fix the plug-in sleeve on the end of the pipe, while the coupling portion with tabs or tongues is used for detachably connecting the plug-in sleeve to the receiving sleeve. In so doing, the tongues engage in the diametrica
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patent: 5350203 (1994-09-01), McNaughton et al.
patent: 5367548 (1994-11-01), Attix
patent: 5496073 (1996-03-01), Grenier
Benteler AG
Binda Greg
Kueffner Friedrich
Nicholson Eric K.
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