| 摘要 |
1,220,874. Jointing by stamping; making pipe fittings. H. MATSUMOTO. 2 Feb., 1968 [4 Feb., 1967], No. 5549/68. Headings B3A and B3Q. [Also in Division F2] In a method and means for securing a fitting 4 having a circular internal bore and a hexagonal periphery on a pipe 1 two tools 6 and 7 are moved towards each other and engage the fitting so as to exert four angularly directed compressive forces 16, 16; 17, 17 to produce an elliptical internal cross-section and then two forces 22, 23 in the direction of movement of the tools to make the bore of the fitting circular and closely fitting on the pipe. The hexagonal faces of the fitting are preferably convex. A fitting is made by first forming it with dimensions corresponding to the final dimensions to be achieved, and then expanding it by means of a conical tool to a larger diameter. The fitting is then placed in tools similar to 6 and 7 and compressed. If the internal cross-section is circular after the compression this represents the final form of the fitting. If, however, a non-circular cross-section is obtained as in Fig. 10 then the dimensions of the thickness of the fitting are increased or decreased by amounts S 2 , S 1 to obtain the desired final form for the fitting. |
