Cleaning and liquid contact with solids – Processes – Including application of electrical radiant or wave energy...
Patent
1984-12-28
1986-04-15
Fisher, Richard V.
Cleaning and liquid contact with solids
Processes
Including application of electrical radiant or wave energy...
144380, 134 6, B08B 700
Patent
active
045825408
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method for removing glazing putty from windows.
The conventional technique of removing glazing putty in the renovation of windows includes chipping or scraping away the putty strand with a chisel. It is a well-known fact that removing the putty in this manner, without damaging the window casement and cracking the pane, is very difficult and hard work, especially when it is important that the pane be maintained intact, for instance in antique windows with hand-blown glass.
The present invention aims at obviating the abovementioned difficulties and to provide a method by which the glazing putty can be removed quickly and simply without damage to the glass.
The invention is based on the discovery that also old and hard putty can be softened by heating with infrared radiation, whereupon the putty can be readily removed, and that the infrared radiation selectively heats the putty without heating the glass.
It should be emphasized that heating by infrared radiation (IR radiation) is characteristic of the present invention. Thus, if one tries to plasticise the putty by heating in some other manner, for example by means of a hot air blast, the pane will inevitably crack because of the thermal stresses arising in the glass. Besides, a large amount of excess heat is generated so that this technique is uncomfortable and disagreeable to work with. The hot air also destroys any paint on the casement through blistering and flaking so that the casement must be repainted. By using IR radiation, in accordance with the present invention, it has quite surprisingly been found that the IR radiation quickly and efficiently heats the putty, but in effect not the pane. This means that the putty can be heated without cracking the pane. It is true that the paint on the casing will be heated by the IR radiation, but also this problem has been eliminated by focusing, in accordance with the present invention the IR radiation to the putty strand.
To facilitate understanding of the invention, it will be described in more detail below, reference being had to the accompanying drawings in which FIG. 1 is a schematic cross-sectional view, taken along line I--I in FIG. 2, of an apparatus for removing glazing putty from a window, in accordance with the method of the present invention. FIG. 2 is a lateral view of the apparatus shown in FIG. 1.
The apparatus shown in FIGS. 1 and 2 consists basically of an IR heating apparatus having an elongate heating wire 2 which in FIG. 1 is shown in cross-section, and an elliptical reflector 3 focusing the IR radiation 4 in a focal line 5. The apparatus has a carrying handle 6, an outer casing 7 and, furthermore, is provided at its front end located at the focal line 5 with a spacer member 8. The spacer member 8 serves to place the apparatus during use at the correct distance from the putty strand on the window. To this end, the spacer member 8 extends up to the focal line 5 and terminates in the same plane as the focal line or slightly before so that the IR radiation can be focused onto or in the putty strand. Furthermore, to make the IR radiation impinge upon the putty strand at the most favorable angle, the spacer member preferably is in the form of a nozzle casing having an elongate opening 9 which is surrounded by elongate lateral surfaces 10, 11 converging towards said opening. The angle (.alpha.) between a converging lateral surface 11 and a plane extending through the focal line 5 and the heating wire 2 is such that the focal line of the IR radiation will impinge upon the putty when the elongate opening 9 of the spacer member 8 is placed upon the putty with the lateral edges of the opening 9 resting against the putty strand 12. Furthermore, the value of the angle .alpha. should be selected such that, when the lateral edges of the opening 9 rest against the putty strand 12, the lateral surface 11 is slightly spaced from the pane 16 to avoid scratching the glass when the apparatus is moved along the putty strand 12. The angle .alpha. preferably is about 30.degree.-45
REFERENCES:
patent: 3623909 (1971-11-01), Jones
patent: 4028135 (1977-06-01), Vig et al.
patent: 4188723 (1980-02-01), Fuchs
Cohen Sharon T.
Fisher Richard V.
Utvecklings AB Carmen
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