Metal fusion bonding – With means to remove – compact – or shape applied flux or filler – By fluid blast or suction
Patent
1991-04-11
1994-04-05
Rosenbaum, Mark
Metal fusion bonding
With means to remove, compact, or shape applied flux or filler
By fluid blast or suction
228 205, B23K 100
Patent
active
052997251
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a desoldering tool of the type comprising a heated desoldering tip of which the bore is connected via a suction tube to the front end of an elongated tin collecting container with the rear end being connected via a vacuum tube to a vacuum source.
In such desoldering tools the solder caused to melt with the aid of the desoldering tip is sucked off through the bore of the desoldering tip and a suction tube which opens into the front end of an elongated tin collecting container of which the other end is connected to a vacuum source in order to suck the molten solder through the desoldering tip and the suction tube into the tin collecting container, in the path of which a baffle plate is usually arranged against which the extracted tin strikes, an air permeable filter being arranged behind the baffle plate. In such desoldering tools the tin collects in the tin collecting container and there is a danger that the tin in the tin collecting container, due to the thermally conductive connection to the suction tube and the desoldering tip and the vicinity to the heating element of the desoldering tool, will be held partially in molten state and drip back through the suction tube and interrupt the vacuum. To avoid this dripping back, it is known to make the suction tube bent and allow it to open into the front end face of the tin collecting container. However, such a bent suction tube easily becomes clogged and is difficult to clean.
SUMMARY OF THE INVENTION
From the U.S. Pat. No. 3 970 234, a desoldering tool is known wherein the straight suction tube extends through a mounting member to the rear end of which a glass cylinder having an end cap is secured, said glass cylinder forming the tin collecting container. Between the mounting member and the inner space of the glass cylinder, an air permeable filter is arranged, the suction tube also extending through said filter. Within the head piece and around the suction tube, a plenum is formed which is connected to a vacuum source. The air from the tin collecting container formed within the glass cylinder is therefore sucked of via the filter into the plenum and then to the vacuum source. The suction tube extends beyond the filter such that a kind of tin collecting space is thereby formed around the portion of the suction tube protruding beyond the filter, but tin dripping back and collecting in this tin collecting space would block the filter so that the desoldering tool could not be operable anymore.
The invention is based on the problem of providing a desoldering soldering tool of the type mentioned above in which the dripping back of the extracted tin is avoided without having to use a bent tube that is difficult to clean. This problem is solved by characterized in that the front end of the tin collecting container is made conical, that the suction tube extends through a bore formed in the generated surface of the conical end of the tin collecting container into the latter and projects with respect to the inner wall of the generated surface via a considerable distance such that a tin collecting space is formed around the portion of the suction tube projecting into the interior of the conical end.
Advantageous embodiments and further developments of the invention will be apparent from the subsidiary claims.
With the configuration of the desoldering tool according to the invention it is ensured that even when using a straight suction tube, dripping back of the extracted tin is avoided with certainty because the tin collects around the portion of the suction tube projecting into the interior of the conical end and thus lies beneath the mouth of the suction tube in the tin collecting container.
According to a further development, the conical end of the tin collecting container may be formed by a frustoconical end cap which is connected to a cylindrical portion of the elongated tin collecting container. The suction tube extends at a right-angle to a generatrix of the conical generated surface or shell in the directi
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Eisele Ernst
Eisele Fritz
Cooper Industries Inc.
Mah Chuck Y.
Rose David A.
Rosenbaum Mark
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