Nova Patents
US3147142A

Precision coating devices

Abstract

This record has no abstract on file.

US3147142A, drawing sheet 1
Sheet 1 of 2

Term

Term ended

Expired 1 September 1981, 45.1 years ago.

  1. Priority and filed
  2. Granted
  3. Expired
  4. Today

3 claims: 2 independent, 1 dependent

  1. 1
    Having thus disclosed the best embodiment of the invention presently contemplated, what is claimed is:1. A precision spraying apparatus for coating a workpiece comprising in combination: a jet spray source;a first template having an orifice positioned in the path of the jet emanating from said source;and a second template positioned between said first template and the workpiece, said second template having an orifice positioned in line with the orifice of said first template, said second template orifice being smaller than the orifice of said first template, the largest divergence between the projected outlines of the first and second template orifices being less than 0.080, the smallest dimension of said second template orifice being within the range of 0.010 to 0.025 and wherein the workpiece is positioned directly in line with said orifices during coating, said jet being directed through said orifices so at impinge directly on the workpiece.
  2. 3
    3,147,142 PRECISION COATING DEVICES Frank S. Rudo, 19 Pierrepont St., Brooklyn, N.Y. Filed Jan. 25, 1961, Ser. No. 84,789 2 Claims. (CI. 118—301) This invention relates to an improved collimator device for producing a shaped jet of a sprayed material. The term “collimator” is used herein in a sense somewhat different from, but related to, its use in optics. It describes a device which serves to define the direction and to limit the area and deviation from parallelism of a portion of a jet of material issuing from a spray nozzle. In this respect, the device acts much as the optical collimator selects and defines the path of a portion of a stream of light. As described herein, a suitably shaped and positioned orifice acts in co-operation with a spray nozzle so as to define a jet of sprayed material. In certain processes, a jet of vaporized metal or other coating material is projected upon a moving body by means of a sprayer or atomizer to provide a track of sprayed material. In order that the track accurately conform to a desired pattern, it is often necessary to restrict the dimensions of the jet to within predetermined boundaries. This is accomplished by interposing between the article to be coated and the spray source a template. However, it has been found that a build-up of the coating material readily forms on the template and that eventually a clump of material passes through the opening and is deposited onto the article to be coated. This problem is particularly acute where the aperture in the template is of relatively small dimension. It is an object of this invention to provide a device which will prevent this occurrence. Another disadvantage of the prior art template apparatus is that it requires frequent cleaning during operation. Accordingly, it is a further object of this invention to provide an apparatus which does not require frequent interruptions of the coating process. Still other objects and advantages of the invention will, 40 in part, be pointed out with particularity and will, in part, become obvious as the following description proceeds taken in conjunction with the accompanying drawing. In the drawing:FIG. 1 is a perspective view of the apparatus of this 4g invention employed in conjunction with a member being coated. FIG. 2 shows in plan the prior art apparatus. FIG. 3 shows in plan the apparatus of this invention. Referring now to FIG. 1, there is shown a member 10 g0 upon which it is desired to form a coating. The member 10 is rotated by means of motor 11 past a jet of coating material 12 provided by sprayer 14. The jet passes through orifice 16α of template 16 which shapes the jet to the approximate cross section desired. The jet gg then passes through orifice 18α of member 18, which orifice is of smaller size than orifice 16α, and produces a pattern on the member 10 of the desired shape and cross section. Suitable control means for controlling the movement of member 10 are provided but do not θθ form a part of the present invention. Referring now to FIG. 2, there is shown the effect of the prior art single template collimator arrangement. It will be noted that the sprayed material 12 piles up along the edge of the orifice 22 forming clumps 13. Under the action of the jet stream 12, the clumps occasionally pass through and are deposited on the base 10. A clump that has passed through is identified by reference numeral 13α. If the orifice 22 is of small dimension, it will quickly be closed by the deposit. Of course, if the plate is frequently cleaned this effect can be avoided, but in ‘° general, frequent cleaning of the template is a time-con2,035,677 Steinke--------------- Mar. 31,1936 FOREIGN PATENTS 660,924 Germany______________May 23,1938 103,488 Great Britain___________Jan. 15,1917 815,804 Great Britain___________July 1,1959
Independent claims2