Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1991-05-24
1992-12-22
Valentine, Donald R.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204237, 204273, 204284, 204292, 204297R, 204DIG13, C25D 1700, C25D 2110, C25D 2122
Patent
active
051731614
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a device for applying and/or removing coatings on workpieces, said device having conveying means and a container (process chamber) for receiving the workpieces, an inlet line which is connectable to at least one medium source and an outlet line connecting the container to the medium source, said medium source disposed below the conveying means where the connection between the lines and the medium source is established by at least one control device which is connectable to at least three different medium sources and disposed below the container.
In conventional devices of the type mentioned above and as described, for example, in German Patent DE 10 34 447 B or British Patent GB 893 570 A, the medium is pushed into the process chamber. As a result, when media are changed, deposits remain in the conveying device and mix with the new medium. Thus, it is not possible to use these devices where a high degree of purity of the medium transported into the process chamber is required. A further disadvantage is that, if the lines are damaged, the media are conveyed to the outside under high pressure, due to overpressure in the lines and the process chamber.
Based on the above state of the art, it is an object of this invention to provide a device which operates without forming deposits and which can be used with incompatible liquids.
This object is attained in accordance with one embodiment of this invention wherein wherein the conveying means is a vacuum pump and is incorporated into the outlet line of the container (process chamber).
Accordingly, because the circulation of the liquid from the medium source to the container (process chamber) and back to the medium source is achieved by under negative pressure, at most an implosion may occur in the lines or reservoirs in the event of leaks. As a result, the medium does not reach the outside, but rather flows back into the associated medium reservoir by itself. In addition, during operation there are no noticeable disruptions of the operation, because switching occurs very rapidly. In this way, one continuous cycle is replaced by another continuous cycle in extremely short time.
In accordance with one embodiment of this invention, the conveying means is positioned above the medium sources. As a result all lines between the container (process chamber) and the medium, as well as the control means, for example radial or axial sliding valves, are completely emptied if they are not under pressure and they are connected to the respective medium reservoirs so that medium can flow through them.
In accordance with another embodiment of this invention, at least one opening for a holder supporting at least one workpiece is provided in the wall of the container (process chamber). The holder has an elastically deformable sealing section which is connected under pressure with the wall. In accordance with yet another embodiment of this invention, the opening is provided with a sheathing in the form of a truncated cone which tapers towards the interior.
This invention is applicable to and can be utilized, in particular, in the field of medicine, and more particularly, in the dental field. In embodiments of this invention suitable for such applications, the container (process chamber) comprises a material which is resistant to the media. Because the container (process chamber), is under negative pressure the plugs in the container do not require threads, it being sufficient to place them in the openings after they have been supplied with the workpieces. Because of the negative pressure, a force directed towards the interior of the container acts on the plugs and prevents their separation from the container.
Located between the conveying device and the container (process chamber) is a magnetic valve (V) which, when opened, equalizes the pressure so that the liquid can flow from the container (process chamber) and the lines into the appropriate medium reservoir without leaving a residue. Opening of the val
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Patent Abstracts of Japan, vol. 9, Number 119, May 23, 1985.
Patent Abstracts of Japan, vol. 7, Number 46, Feb. 23, 1983.
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