Metal working – Method of mechanical manufacture – Obtaining plural product pieces from unitary workpiece
Patent
1985-10-11
1987-04-28
Larson, Lowell A.
Metal working
Method of mechanical manufacture
Obtaining plural product pieces from unitary workpiece
72203, 285412, 285415, F16L 2302
Patent
active
046602666
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a split-flange connector. More particularly this invention concerns a method of making such a connector.
These are loose flange connections for pipe or hose connections on hydraulic parts, for example, mobile devices, like dredgers, cranes etc., as well as rolling mills and other known devices. Such a flange consists of forged material or malleable cast iron. The mold corresponds to the illustration in accordance with FIGS. 1 and 2, however in view of the required hardness, caused by the manufacturing process between the two screw bores of half a flange (flange half shell), a curved shaped rib is provided which extends to the proximity of the screw threads. Therefore, not sufficient space is left for applying a fixed wrench, so that a tightening can be performed only at small angles, i.e., one has to apply the fixed wrench again and again. Socket wrenches do not find space because the dimension of the screw does not leave any space for the center bore. Furthermore, the rib constitutes the additional waste of material because it corresponds at its highest point to the flange thickness in the screw bore area. Furthermore, it is disadvantageous in the known embodiments that the flange half shells cannot be made in any desired hardness; this is particularly true for the flange half shells made of malleable cast iron. Finally, too much waste is generated and one must operate with a high energy consumption because of the high temperatures and the many aftertreatment steps, respectively. Furthermore, the engagement faces facing each other must be subsequently treated because the cutting thickness of the saw blade is lost at this location if the half shell is made by cutting open a flange which had been extruded as a total unit. As is known, half shells are required because one cannot mount a flange as a total unit onto the bore end or the coupling piece. Finally, a precise positioning with respect to the pinhole image of a pump or hydraulic, for example, is not possible. Therefore, at first, the one half flange must be mounted during assembly and then the second one must be subsequently attached. Thereby, difficulties are already generated, in particular because a precise centering is not possible, since each screw bore will be larger than the screw to be introduced. In other words, the mounted flange is displaced and the supporting faces of the screws with respect to the screw bores are not centrically disposed. When tightening the screws one does not have a uniform force pressure. Since, in addition, the screw material is harder, for example, than the malleable cast iron material or the forged half shells, the screws will loosen because the material of the flange half shells flows due to the high tightening pressure; a continuous subsequent tightening is required.
SUMMARY OF THE INVENTION
it is an object of the invention to provide a flange which is shaped from two flange half shells which does not have the aforementioned and later mentioned disadvantages, which, in particular, can be easily mounted, which can be preoriented at the place of use (hose coupling piece, etc.), in such a manner as if it would be a complete (unitary) flange and whereby between the screws and the flange material none or almost no difference is present, so that uniform material characteristics come into engagement with each other during the tightening of the screws. Furthermore, it is also an object of the invention to provide a more cost favorable flange which assures a correct and desired seat after assembly and which also guarantees a uniform face pressure of the tightened screws.
These objects are attained according to the instant invention in a method of making a split-flange connector comprising the steps of first rolling a strand of steel into an elongated bar having a rolled planar face formed centrally with a semicylindrical groove extending parallel to the face. This bar is then cut perpendicularly to the face into at least two identical sections of a predetermi
REFERENCES:
patent: 725837 (1903-04-01), Gmeiner
patent: 1474436 (1923-11-01), McWane
patent: 3004780 (1961-10-01), Main
patent: 3600012 (1971-08-01), Stafford
patent: 4074914 (1978-02-01), Novotny
patent: 4171142 (1979-10-01), Harrison
patent: 4352512 (1982-10-01), Janssen et al.
Larson Lowell A.
Striker Michael J.
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