Electric heating – Metal heating – For bonding with pressure
Patent
1987-02-24
1989-05-30
Shaw, Clifford C.
Electric heating
Metal heating
For bonding with pressure
219 56, 219 7801, 219 8519, B23K 1132
Patent
active
048353582
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. FIELD OF THE INVENTION
The present invention relates to a process for the automatic soldering of a platelike body inside hollow elements having a transverse, polygonal-shaped section and relates to the soldering machine which will perform said process.
2. DESCRIPTION OF THE BACKGROUND ART
Various soldering machines and processes are known in the prior art. For instance, Italian patent application No. 23804 A/83 describes a modular structure for carpentry work. This structure is mainly composed of a plurality of bars that are assembled through joints. These joints are shaped so as to accommodate the screw heads whose shank can be screwed into a platelike body arranged at both bar ends, perpendicular to their axes. According to a preferential embodiment said platelike body is joined to the bars with solder.
The bars have a transverse polygonal-shaped section and the automatic soldering operations require that the technical problems connected with the arrangement of the platelike body inside a element be overcome. Also, the problem of soldering more sides of the platelike body to the respective internal faces of the element must be solved.
It is well-known that the most suitable soldering process to be performed under an automatic process is a "thermal resistance" process where the heat, through the Joule effect, is produced on the contact surface among the sections to be soldered, which is placed between a pair of electrodes. When such a process is separately performed by soldering a side of the platelike body to the respective internal face of the bar, no particular technical problems are evidenced. Such a process, however, is not compatible with the speed of the automatic production line. In particular, the structure as this design would require the successive execution of four soldering operations and would therefore spend more time than is required by other bar processing designs such as boring, shearing, etc. If the soldering process is divided into four different operations, a reduction in the speed of the production line results.
SUMMARY OF THE INVENTION
The present invention therefore has an object of the provision of a suitable process capable of performing the simultaneous soldering of each side of the platelike body (for example, four or more sides) to the respective internal portion of a hollow element as well as the object of providing a suitable machine for carrying out such a process.
To this end, the process, according to the present invention, carries out the steps of placing the bar and the platelike body on a respective support and drawing out the platelike body and electrically connecting the body to a first electrode of the soldering machine. The unit composed of "first electrode--platelike body" is then moved to allow the insertion of the platelike body inside the bar, into a position which coincides with the junction line between the first and the second part of the second electrode of the soldering machine. The first and/or second part of the second electrode are the- moved along the junction line and as they come into contact with the bar, an electric potential between the first and second electrode is applied.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:
FIG. 1 shows a perspective view of the machine of the present invention;
FIG. 2 shows the solderin
REFERENCES:
patent: 2550965 (1951-05-01), Brown
patent: 3600548 (1970-07-01), Bock
patent: 3699756 (1972-10-01), Ritter et al.
patent: 4383163 (1983-05-01), Sjoholm
patent: 4610561 (1984-12-01), Cecchellero et al.
Cecchellero Sergio
Salvatore Daniele
Italtel Tecnomeccanica S.p.A.
Shaw Clifford C.
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