Metal working – Means to assemble or disassemble – Coupling to conduit
Patent
1986-07-07
1987-09-29
Weidenfeld, Gil
Metal working
Means to assemble or disassemble
Coupling to conduit
72402, B23P 1904
Patent
active
046960856
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for pressing tubular parts, more particularly for pressing and nipping pipe-unions onto pipes, sleeves or hoses, the said apparatus consisting of a plurality of spring-loaded jaws adapted to be adjusted radially, and of a piston of annular cross-section which acts upon the said jaws, the interior of the said piston being enlarged conically at the end facing the jaws, the radially external boundary surfaces thereof bearing, with a corresponding angle of inclination, upon the said conical enlargement, and the said piston being adapted to move hydraulically towards the said jaws and to be returned hydraulically to its neutral position.
A few examples of embodiment of such apparatus are already known. More particularly, an apparatus of this kind is used for pressing pipe-unions onto the ends of hydraulic hoses. Pipe-unions of this kind are generally in the form of two tubular sections arranged coaxially of each other, joined together at one end carrying the parts of the union, for example threaded sections. An annular gap remains between the two tubular parts, into which the end of the hose is inserted. The parts of the pipe-union thus assembled are then inserted between the jaws of the apparatus and pressure is applied radially, the end of the hose being thus firmly clamped between the two tubular sections.
In one known device of this kind, several jaws are arranged around an axis and are placed within a pressing element comprising a conically tapering internal surface. A cylindrical hydraulic piston is provided in order to shift the pressing element against the jaws. This movement, and the conical configuration of the conical surface bearing against each other, causes the jaws to move radially towards each other, and the hose-connection placed between the said jaws is thus compressed. Also provided are measuring means which indicate whether the desired final outside diameter has been reached. To this end, the measuring means must be observed by the operator, in order that the drive to the apparatus may be shut off at this moment. In an apparatus of this kind, the hydraulic cylinders must be relatively large in order to achieve the necessary pressure. If only a lower operating pressure is available, this raises complex design problems, since the apparatus becomes bulky.
Attempts have already been made to use a largearea piston in axial arrangement in relation to the axis of the jaws. With a design of this kind however, the apparatus is accesible only from one side, which means that only terminal pipe-unions can be fitted. For example, a sleeve-joint for a hoseline cannot be fitted with an arrangement of this kind. Furthermore, this design requires a plurality of spring-loaded spindles for the purpose of returning the jaw-actuating elements to the neutral position. Here again, this is a costly and complex design. If these spindles are not equipped with springs, the actuating elements and spring-loaded jaws can be returned only by their own weight. This substantial reduces the operating speed and leads to breakdowns during operation.
In the case of another apparatus, in which the jaws are actuated by direct radial action of a pressure-medium, problems arise, since the necessary pressure can by no means be obtained. This means that pressure must be built up by the pressure-medium and this can be accomplished only by designing an oversized apparatus.
In the case of another known apparatus, a piston is mounted displaceably in a cylindrical housing having a stop-shoulder, the said piston being also equipped with an outwardly directed stop-shoulder. A cylinder-chamber is provided between the outer surface of the piston, the inner surface of the cylinder, and the two boundary surfaces, facing each other, of the said stop-shoulders, and this chamber can be acted upon hydraulically. Again, an arrangement of this kind produces space problems and apparatus with correspondingly large dimensions, since almost the same piston-cylinder unit must be provided laterally outside the actuatin
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Firma Compat Aktiengesellschaft
Webb Glenn L.
Weidenfeld Gil
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