Heating – Processes of heating or heater operation – Treating an article – container – batch or body as a unit
Patent
1983-06-27
1984-11-06
Camby, John J.
Heating
Processes of heating or heater operation
Treating an article, container, batch or body as a unit
34144, 100 92, 100 93P, 432125, 432253, F27D 300, F27D 500, F26B 904, B02C 1108
Patent
active
044809905
ABSTRACT:
An article support rack (10) has at least one article support (12), such as a shelf, which is horizontally slidable in a first frame (18). A second frame (29) is mounted for vertical movement relative to the first frame (18). At least one weight (26) is supported by such second frame (29) at a certain distance above the article support (12) when the first and second frame are in a first position relative to each other. Articles (24) such as circuit boards are placed on the article support (12), and the vertical position of the first and second frames are shifted to a second position relative to each other wherein the upper surface of the circuit boards is pushed against the respective weight to lift the weight off its support such that the weight rests on the circuit boards. In a treating chamber (22), for example a bake oven, pedestals retain the first and second frames in such second position, such that the weights rest on the circuit boards (24) during a drying process to prevent the circuit boards from becoming warped. The absence of similar pedestals outside the bake oven causes the two frames to shift back to the first position relative to each other when the support rack (10) is removed from the oven to remove the weights from the circuit boards and allow them to be unloaded from the rack.
REFERENCES:
patent: 2586474 (1952-02-01), Moore
patent: 2762514 (1956-09-01), McGinn
patent: 3330419 (1967-07-01), Joseph
Beam William D.
Chrisman David C.
Cox Lloyd R.
Hankins Charles R.
AT&T - Technologies, Inc.
Camby John J.
Schellin W. O.
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