Metal deforming – By tightening flexible band or chain about work
Patent
1998-12-04
2000-04-04
Crane, Daniel C.
Metal deforming
By tightening flexible band or chain about work
72402, 29237, B21D 3904
Patent
active
060446811
DESCRIPTION:
BRIEF SUMMARY
This invention concerns a pressing tool for compressing pipe ends.
Systems in which the pipe ends are provided with press fittings are increasingly being used for hot water and tap water installations. These eliminate the need for screwing, welding and soldering, which can lead to undesirable structural changes in metal pipes. Moreover, it is also possible to process plastic pipes or metal/plastic compound tubes with this technique. The compression can also be carried out in a short time. For joining metal pipes of copper or high-grade steel, the fitting has a tubular end, for example, into which the connecting pipe is inserted. This area of the fitting is then shaped into a hexagon, e.g., by externally applied forces. This yields a form-fitting connection of the fitting and the pipe by means of which the forces arising from internal pressure are transmitted. A tight connection is guaranteed by a gasket installed in the fitting. Most of the pressed pipe diameter is less than about 40 mm. In this range, it is customary to perform compression by means of tong-like tools, where two cheek plates, each with a semicircular recess, corresponding to the pressing geometry, are moved toward one another like scissors. This principle is not feasible for larger pipe diameters, e.g., with a nominal diameter of more than 63, because the pressing forces and hence the tongs become very large, and the unfavorable shearing movement in this case leads to uneven compression.
With regard to the state of the art described previously, the technical object of this invention is to improve the pressing tool of the type in question.
This problem is solved and the object is achieved by the invention, which is based on a bearing and an abutment being provided on the pressing tool. Furthermore, according to this invention, an extruding die is also provided according to this invention, having at least two press elements. An advantageous embodiment provides that for compression, the extruding die is acted upon by a holding fixture. The chucking fixture may have a hydraulic cylinder, for example, for this purpose. An advantageous embodiment of the object of this invention proposes that the chucking fixture has a prestressed spring. In addition, according to this invention an end piece of the chucking fixture acting against the abutment is catch-locked in an open position. It is also advantageous for the end piece to be catch-locked in a prestressed position. Another provision according to this invention is that the chucking fixture acts on the extruding die by means of tong-like jaws. According to another embodiment, the open position of the extruding die is limited by stops on the press elements relative to one another or the press elements on the straps. Due to this embodiment, the extruding die in the open position is held in a prior use position. Due to the stop limiting of the individual press elements relative to one another or the press elements on the straps, the swiveling motion of the extruding die is limited. The individual press elements thus do not exhibit the freedom in swiveling known to be associated with conventional chains. Thus, the pressing tool, with the open extruding die can be guided well to the workpiece to be compressed. A preferred design here is one where the press elements of the extruding die in an open position are aligned approximately axially to the chucking fixture or with a slight curvature according to a large opening radius. It has also proven advantageous for a press element to have an internal collar section. As a rule, extruding dies act on a thin-walled bushing which is pushed onto the pipe ends. When there is a great reduction in diameter of these bushings, under some circumstances a fold may develop between the press elements moving toward one another. This disadvantageous effect is counteracted by this invention by the fact that the ends of the collar sections of two press elements in the circumferential direction are profiled such that they overlap in the compressed state. It is significant here
REFERENCES:
patent: 2800867 (1957-07-01), Smith
patent: 2871812 (1959-02-01), Pederson
patent: 2973024 (1961-02-01), Merriman
patent: 3555875 (1971-01-01), Clark
patent: 5598732 (1997-02-01), Dischler
Crane Daniel C.
Gustav Klauke GmbH
LandOfFree
Pressing tool does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pressing tool, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pressing tool will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-355291