Metal fusion bonding – Solder form
Reexamination Certificate
1998-07-30
2001-02-27
Ryan, Patrick (Department: 1725)
Metal fusion bonding
Solder form
C228S164000, C228S171000
Reexamination Certificate
active
06193131
ABSTRACT:
BACKGROUND OF THE INVENTION
a) Field of the Invention
The present invention relates to a solder sleeve and to a method for forming such a solder sleeve.
b) Description of the Related Art
In the soldering of objects, particularly wires and cables, so-called solder sleeves can be used. Such solder sleeves are pushed over the objects to the place requiring soldering, whereafter the solder sleeve is softened by supplying heat and the soldered connection is realized.
Solder sleeves have been manufactured heretofore by deep-drawing from a length of solder material a cup-shaped bulge from which a cylinder is subsequently cut and the remaining material is melted down to once again form a length of solder material. Such a method is expensive, while the manufactured solder sleeves may have burrs on the sleeve edges as a result of the cutting whereby sliding of such a solder sleeve along and over the object is made difficult or impossible.
SUMMARY OF THE INVENTION
The present invention has for its object to provide a solder sleeve which substantially does not have the above stated drawbacks. This is achieved according to the invention in that the solder sleeve comprises a split sleeve of solder material having end surfaces of which take the form of form-fitting coupling elements. By making use of form-fitting coupling elements of solder material at the position of the end surfaces, strips can be punched from a length of solder material which can subsequently be bent round so that there remains substantially no solder material which must be fed back for re-use after melting down. It has been found that such a solder sleeve can be manufactured unexpectedly well within narrow tolerances and retains its form, this as a result of the residual stresses which are present.
Many kinds of known form-fitting shapes can be used as coupling elements, such as coupling elements comprising a female element and a male element complementary thereto. Such coupling elements preferably lock against a mutual displacement in the axial as well as the peripheral direction.
In order to easily perform the subsequent soldering it is further recommended that the internal surface of the sleeve is provided with at least one opening for delivering flux material. It is thus possible to release flux material locally and at the right position during the soldering process. It is however apparent that the solder sleeve can likewise be provided with flux material on its internal and optionally its external surface.
Because the solder sleeve is manufactured from a strip which is punched from a length of solder material, it is possible to form the length such that its longitudinal edges are rounded, whereby the sleeve also has rounded edges. This provides the advantage that no stagnation occurs during sliding of the sleeve over and along the objects.
The present invention also relates to a method for forming a solder sleeve, comprising of:
i) providing a strip of solder material having end surfaces which take the form of form-fitting coupling elements; and
ii) bending the strip to form a sleeve, wherein the coupling elements mutually engage for coupling.
In further preference the sleeve is deformed close to a transition of the coupling elements. Thus is avoided that the coupling elements move apart since deformation of material occurs at the position of the transition between the coupling elements. Use is hereby made of the deformability of known solder material.
Mentioned and other features will be further elucidated hereinbelow on the basis of two embodiments which are given by way of example without the invention being deemed limited hereto, wherein reference is made to the annexed drawing.
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patent: 48577 (1938-04-01), None
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Patent Abstracts of Japan, vol. 9, No. 282 (M-428) for JP 60 124491, Jul. 3, 1985, 1 page.
Olson, H., “How to Design for Preform Brazing”, Welding Engineer, Sep. 1960, pp. 36-39.
Godijn Paul Willem
Oud Martinus Adrianus
Velthuizen Willem
Welling Antonius Johannes
Pittman Zidia T.
Ryan Patrick
Webb Ziesenheim & Logsdon Orkin & Hanson, P.C.
Witmetaal B.V.
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