Metal deforming – Tool and/or tool holder – Including flexible or yieldable tool or support
Patent
1993-11-29
1994-12-06
Larson, Lowell A.
Metal deforming
Tool and/or tool holder
Including flexible or yieldable tool or support
72369, B21D 901
Patent
active
053699734
ABSTRACT:
The invention relates to a process for bending pipes, which preferably are deformable or bendable when heated. In this process the pipe to be bent is heated, if need be, an inside support is put in, and then the bending operation is carried out. Prior to the bending operation a pipe-like inside sleeve (3) which is expandable up to a certain degree is inserted in the pipe (1) to be Dent, and the inside sleeve (3) is filled with a pressurized medium so that it comes to rest fully against the inside wall of the pipe (1) to be bent, whereupon the bending operation takes place. The apparatus for performing the process comprises an insertable flexible pressure pipe (3) of a material that expands under pressure, the ends of this pipe being fitted with sealing parts (5, 6), the outside diameter of which is not greater than the inside diameter of the pipe (1) to be bent.
REFERENCES:
patent: 2497622 (1950-02-01), Mueller
patent: 2908940 (1959-10-01), Jones
patent: 3180130 (1965-04-01), Avera
patent: 3922134 (1975-11-01), Kupfrian
patent: 4009601 (1977-03-01), Shimizu
patent: 4197079 (1980-04-01), Patzner et al.
patent: 4916952 (1990-04-01), Thielmann et al.
Larson Lowell A.
Ruppert Hans-Peter
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