Measuring and testing – Vibration – By mechanical waves
Patent
1996-02-26
1998-10-20
Raevis, Robert
Measuring and testing
Vibration
By mechanical waves
294077, H01R 43048
Patent
active
058249060
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a pressing tool for radially compressing a pipe connection between the pipe end and a press fitting.
Sleeve-shaped press fittings are known to be used for pipe ends which are plastically deformable and are made of metal, preferably steel. Such pipe connections and the respective press fittings are described, for example, in DE-C-11 87 870 and DE-C-40 12 504. For the manufacture of the connection, the pipe end and the press fitting are pushed into each other axially and, thereafter, they are force- and form-tightly connected via a pressing tool which is mounted on the press fitting by pressing jaws which are movable toward each other.
The reliability of the connection between the pipe end and the press fitting depends, among other things, on the fact that the pipe end is pushed into the press fitting at a determined minimum insertion depth. The insertion depth is delimited by a constriction in the press fitting. Thereby, the axial distance from the constriction to the end into which the pipe end is to be pushed is greater, the greater the circumference of the pipe end or the press fitting is. The constriction forms, at the same time, a stop to prevent the further insertion of the pipe end.
The arrival at the minimum insertion depth depends of the reliability and the feeling of the mounter. Especially under limited space conditions, the insertion of the pipe end into the press fitting can be impaired and, therefore, it can come to jamming before the constriction is reached, which has the consequence that the minimum depth is not reached and the mounter erroneously does not notice it. As an additional control, it has been suggested to provide markings for the minimum insertion depth on the outside of the pipe. Special measuring apparatus have been developed for this purpose (DE-GM 92 16 760.8). Even the use of marking apparatus does not provide an absolute security against incorrect manipulation. Furthermore, the markings can be inadvertently wiped off.
In DE-C-40 12 504, a process is proposed, which allows a compression only then, when an axial force is applied with the help of a device arranged on a pressing tool, whereby the compression is only then decoupled, when the axial force exceeds a determined threshold value. In this process, it is assumed that the threshold value is only exceeded when the pipe end collides with the constriction. Besides the fact that a correspondingly built arrangement for seizing the axial forces must be provided for this process, the process also does not sufficiently ensure that the threshold value for the axial force is only reached when the pipe end actually collides against the constriction.
A process is known from JP-A-57-142507, wherein the position of a rubber ring, which is arranged on the inside of a pipeline faucet and inverted over a pipe end, can be determined. For this purpose, an oscillation source is moved along a pipe axis inside the pipe. An oscillation sensor is placed in the front area of the pipe and measures the change in the oscillation behavior in dependence upon the movement of the oscillation source. The position of the rubber ring between pipeline faucet and pipe end can be determined based on these changes.
This process is not for determining the insertion depth of the pipe end and, additionally, presupposes that the measuring apparatus with the oscillation source and the oscillation sensor can be guided in from the inside. The process, therefore, is not useful for the measurement of the insertion depth in a pipe connection of the present art.
Therefore, the invention has as its object to provide a means for a secure control of the insertion depth between a pipe end and a press fitting in a pipe connection.
The object of the invention is solved in that the measuring apparatus for measuring the insertion depth of the pipe end is provided in the press fitting, which has a thickness sensor for the measurement of the material strength of the pipe connection as well as an interpretation device for the at least qualitative display o
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patent: 3345840 (1967-10-01), Webb
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patent: 3859837 (1975-01-01), Burroughs
patent: 4520672 (1985-06-01), Saint-Amour
patent: 4555665 (1985-11-01), Stanley et al.
patent: 5484174 (1996-01-01), Gotoh et al.
patent: 5490406 (1996-02-01), College
57-142507 Sep. 3, 1982 Japan Abstract Name: Kubota Tekko K.K. "Ascertaining Method for Position of Rubber Ring for Tube Coupling".
Berenato, III Joseph W.
Novopress GmbH Pressen und Presswerkzeuge & Co. KG
Raevis Robert
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