US1261141A - Propeller. - Google Patents

Description

F. H. LUENSE.

PROPELLER.

APPLlcATloN FILED Nov. to. 1916.

Patented' Apr. 2, 1918.

LLlL

mit? 'l Be it known that I, FREDERICK H. LUENBE,

a subject of the Emperor of Germany, havmg announced my intention of becomin a citizen of the United States of America, `and a resident of Sta leton, Staten Island, Richmond county, an State of New York, have invented certain new and useful Imrovements in Prsellers, of which the folowing is a spec' cation, reference being had to the accompanying in a part thereof.

y invention relates to methods or proc'- drawings, formesses of coating or finishing articles and has special reference to such as ,are applicableto aeril propellers and otherv devices made of 'c vantages over coatings produce adapted to coperate in the pro fully dried to avoid b ut when propellers @ne object of my invention is to provide metallic coating is produced which is ve intimately-united with the article itself.

Another object is to provide a process of coatin tion o definite steps whic are articularly uction of a e metallic coating possessin .many adof the ste taken alone. Prope ers for aerial navigation are relativelylarge and operate at highsieeds and they are of course necessarily ight and strong. In order to fulfil these conditions, they are usually 'made of wood andare built up in sections which are very carefully united. Furthermore, the wood is very carewarping and tw of this nature arer subjected to adverse vatmospheric conditions such as are encountered, for example, in

tro ical countries, they rapidly deteriorate an in many instances have been known to go to pieces.

he process of myinvention is particularly adapted for the `purpose of providing a coatin which shall hermetically seal the ropeer and overcomethe above-named 'iiiculties. f

In order that my invention may be thoroughly understood I will now proceedto descri the same in the following specification, and then point out the novel features thereof in appended claims.

Referring to the drawings;

Figure 1 is an end elevation of a propeller Bpction of Lettera une,

Appliwtlon med November 10,1918. l el -w A To all 'whom it may concern.'

" with molten metalwhich shall com rise a combina' by either electrolytically deposit;

raten ai. ai.l o. rac..

which may be provided with a coating applied'in accordance with the process of myinvention. Fig. 2 is a side elevation partly in section of a propeller and other devices and illustrates one of the steps 4of the coatin process in which the propeller is 'raye in a finely divide form. The next ste v of the processis illustrated 1n Fig. 3-whic shows'the propellerin an electrolyticbath.

Fig. 4 illustrates on a very lar e scale, the form of the surface as rst produced by the process steps of Figs. 2 and 3, and Fig. 5 illustrates the result ofthe -next step of the process, viz., that of bug the surface.

It will of course be understood that my process is by pro ellers or any particular class of articles. e propeller illustrated is formed of laminationslO, 11 and 12 of wood, which are securely glued together to make a le piece and are'tlen shaped to the dd propeller form. The wood is finished smooth to the desired shape but no filler ror finish is applied before it is subjected tothe first step of the coating process.

This process with which my resent invention is particularly concern first' spraying the prtpeller with molten metal in a finely divide form.

This maybe accomplished by the use of any well known apparatus suchI as that designated 2O in Fig. 2.v In this arrangeno means limited to 'wooden sa v ment compressed air or other 4suitable gas is e utilized for atomizing molten metal and of the propeller.

The metal utilized may be zinc, bronze, copper or aluminum, or some other suitable material. As the tine particlesv of metal strike the surface of the wood with high velocity, the sink into the pores of the wood and a here very tenaciously thereto. By this reason a metallic coating is formed in particularly intimate connection with the surface of the propeller. This coating forms an excellent foundation for the'next step of the process which consists in subjecting the very thinl coated propeller to the action of ain electro ytic bath as shown in Fig. 3, to or, in other words, to electroplate the metallic `coating already applied by the step illustrated in Fig. 2.

As shown in Fig. 3, 22 designates a container, having a metallic lining 23 which is connected by a; conductor 24 to the positive side of a sup 1y circuit. The4 propeller is immersed in t e liquid bath 25 within the container and is connected by conductors 26 -produce a substantially uniform coatmg with a smooth outer surface which has a ver low air resistance.

oodcn articles or articles of other materials may be treated in the manner above described within the spirit and scope of my invention.

what I claim is.:y 1. The fprocess of coating wood that consists in orcibly spraying the wood with molten metal in a finely divided form to inject the metal into the surface of'the wood and to seal the wood against moisture, and

then immersing the coated Wood in an electrolytic bath and electrolytically depositing additional metal on the coated wood.

2. The rocess of coating wood that consists in orcibly spraying the wood with molten metal in a finely divided form to inject the metal into the surface of the wood and to seal the wood against moisture, then immersing the coated wood in an electrolytic bath and electrolytcally depositin additional. metal on the coated wood, and urnishng or polishing the surface to uniformly distribute the metal in the coating.

ln witness whereof, I have hereunto set my hand this 2 day of November, 1916.

FREDERlCK HUGO LUENSE.'

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