Metal working – Means to assemble or disassemble – Means comprising hand manipulatable tool
Patent
1995-06-02
1997-09-16
Watson, Robert C.
Metal working
Means to assemble or disassemble
Means comprising hand manipulatable tool
29282, 292835, 269 43, B25B 2714
Patent
active
056667116
DESCRIPTION:
BRIEF SUMMARY
SPECIFICATION
The invention involves a press tool, specifically for joining tubular workpieces, having a wraparound ring comprised of at least three hinged clamping components, in which the press tool is open at at least one closing point between two clamping components and has grips at that position for a closing device by means of which the clamping components can be brought together to form a closed ring.
One known-in-the-art process for joining the ends of tubular workpieces involves using tubular press fittings that are ductile and are comprised of metal, preferably of steel. The inside diameter of the fittings is greater than the outside diameter of the pipe ends to be joined, so that when the fittings are pressed together radially in order to mount them on the surface of the pipe ends they will become permanently deformed. These types of pipe joints and the associated press fittings can be found, for example, in DE-C1 187 870 and DE-C-40 12 504.
For the process of pressing the fittings together radially, a wide range of press tools have been developed. Because in the past this process has been used primarily in the joining of smaller diameter pipe ends, press tools having only two clamping components have been developed (comp. DE-A-34 23 283). If greater diameter reductions or insertion depths are required, for example if the pipe joint will be required to withstand greater internal pressures, it becomes necessary for the press tool to contain more than two clamping components to prevent the formation of lands on the outside, between the surfaces of the clamping jaws, which would prevent them from closing completely. Simply designed press tools of this type can be found in EP-A-0 451 806. In relation to this, the press tools illustrated in FIGS. (7) and (8) are of particular interest, as they are suited to the joining of pipe ends that are large or very large in diameter.
These press tools contain a wraparound ring that is open at one closing point and is comprised of hinged clamping components, which are comprised of a clamping bracket and clamping jaws that can be moved circumferentially. This type of wraparound ring can be positioned like a collar around the point that is to be pressed, and then drawn together with the help of a closing device. The closing device may be permanently connected to the wraparound ring. If the wraparound ring is intended and designed for pressing larger pipe diameters, however, it is more advantageous in terms of weight and handling to design the closing device as a unit that is separate from the wraparound ring, which can be attached to the wraparound ring in the area of the closing point, after the ring has been positioned around the press fitting; specifically it can be attached to grips that are intended for this purpose and are fitted to the closing device on both of the clamping components that are adjacent to the closing point.
It would be desirable to expand the application of such press tools to include even greater pipe diameters. The wraparound ring then becomes so heavy, however, that handling and safety problems result in placing it around the pipe end or around the press fitting. It is thus the object of the invention to design a press tool of the type described in the beginning for which handling, particularly for larger pipe diameters, is facilitated.
This object is attained in accordance with the invention in that it includes at least one coupling member by means of which the clamping components adjacent to the closing point can be connected, with the coupling member being designed so as to be flexible in the coupled position in the closed direction.
Thus, in accordance with the basic premise of the invention, after the wraparound ring has been placed around the pipe end or the press fitting, it can be temporarily secured, causing the open closing point to be bridged over by a coupling member, which closes the wraparound ring. The wraparound ring is then unable to slide off, which eliminates the need to secure the wraparound ring for the attachment o
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Berenato, III Joseph W.
Novopress GmbH Pressen und Presswerkzeuge & Co.
Watson Robert C.
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