US1559969A - Treatment of surfaces under water - Google Patents

Description

Nov. 3 1925.

A. MAUTERER TREATMENT 0F sURFACEs UNDER WATER Filed Nov. 11. 1924 Patented Nov. 3, 1925.

ARTHUR VIAUTEBER, .OF DORTMUND, GERMANY.

TREATMENT 0F SURFACES UN DER WATER.

Application filed November 11, 1924.

To all whom t may concern.'

Be it known that I, ARTHUR MAUTnnnn, chief engineer, residing` at 25 Beurhausstrasse, Dortmund, Germany, have invented certain new and useful Improvements Itelating to the Treatment of Surfaces Under YVater, of which the following is a specilication.

This invention relates to a process and to devices for projecting liquid and solid substances against :walls by means of streams of compressed air. It is well known to provide objects of all kinds with a coating by means of streams of compressed air, for example with a coating of paint or metal (metal squirting process). It is also known to coat walls with building materials such as mortar, concrete and the like. Further it is also known to spray objects to be cleaned with sharp edged, finely granulated solid substances by means of compressed air for the purpose of cleaning them (sand blast and the like). Y

These known spraying processes however could hitherto only be carried out in air. It is frequently necessary to carry out similar operations under water. For this purpose the usual processes and devices are un-r suitable. The present inventionmakes it possible'to use spraying processes, either for spraying building materials such as concrete, or for spraying protective coatings of paint or metal or the like, or for spraying sand' or other cleaning materials, without the spraying action being affected by the action of the water surrounding the spraying device and the surface to be treated. In order to prevent the disturbing action of the water, a casing is formed of compressed air which encloses the spraying stream and removes the water in the space surrounding it in such a manner that even at a great depth below the surface of the water substantially the same conditions of working can be provided for as when the same operation is carried out in air.

Further features of the invention will be set forth in the following detailed description with reference to thel accompanying drawings wherein three different forms of construction of spraying devices are shown diagrammatically, these devices being particularly applicable for spraying building materials (concrete) on wall surfaces.

Figure l is a longitudinal section of one embodiment of the invention.

Serial No. 749,354.

Figures 2 and 8 are similar views showing other embodiments.

In all of the figures a indicates the actual spraying nozzle which is supplied with a material such as concrete, to be sprayed in the known manner by means of piping by 'nsL the spray which is leaving the front end of the nozzle a and immediately reduce the speed of flow considerably and. also act upon the material which is being sprayed, for example completely destroying the concrete.

According to the arrangement shown 1n Figure l the front part of the nozzle is surrounded by a bell b provided with a hollow annular space c which is open at the front edge of the bell. The space c` is connected by a tubular extension d to a pipe not shown through which compressed air or other liquid under pressure can be supplied thereto.

When the device is in operation the compressed air supplied at l will act as a truncated conical stream against the surface m (as indicated in the drawings by dotted lines) and forms around the nozzle a ain' annular curtain or screen, which retains the space within the same' free from water.

This action can be accelerated in that when the operation with the nozzle a is first started only compressed air is supplied to this nozzle. During further operation the line annular vstream of compressed air ejected from c will suiiice completely to prevent the disturbing action of the water on the stream of material ejected by the nozzle n. The concrete mass or other material sprayed from the nozzle a will be deposited on the surface m in the same manner as when the operation is effected in air.

Instead of forming the hollow space c at considerable distances from the nozzle as illustrated, it may be arranged close thereto in such a manner that the strearnof compressed air closely surrounds the stream of material to be sprayed. It is also not always necessary for the front edge of the bell b to project a considerable distance beyond the front edge of the nozzle a.

In the arrangement shown in Figure l a stream of compressed air is shown ,of which the diameter is reduced towards the wall surface, `but in the construction shown in Figure 2 a stream is provided which is enlarged in diameter inthe form oi' a bell. The annular hollow space c is in this case formed between van inner bell 'b' yand an outerbell or casing c. The supply oi' coinpressed air is effected through the tubular extension al". For the Ipurpose of adjusting `the outle area :from the hollow space c the casing e 'fis movable on the screw threaded neck of the bell l/ .and can be secured in position by means oi a. locknut 7c. l l y surfaces to be coveredatni".

The hollow space between the nozzle a. and-the .bell fb, in ,the arrangement shown in 4Figure 2, lis connected by means of passages" f with a hollow space g formed by z a cap nut i, to which a supply pipe is connected. According to the conditions of working compressed air for example may bek supplied in order to render the space betweenthe nozzle and the bell Z9 free from `water more quickly. By connecting` lthe pipe z' to a pump it is also possible to form a vacuum inside the bell. Through the pipe e' and passages it is also ,possible toV upply' solid, liquid or gaseous substances which co-operate with .the stream ejected from the nozzle a, .for example for accelerating the setting, hardening, ,adhesioinor drying lof the 7mass applied to ,the wall surfacem. v

The arrangement shown in Figure 3 has substantiallythe saine parts as tlie arrangcl ment shown in Figure 2, including the nozzleaeand the bell composed Vof theinner andlouter icasings vZJT-ez spaced apart to form the annular',chamber c2. Compressed air is supplied to this space from an annular chamber ,tr/1, y,formed within the cap nut lil, bynieans ot' passages f1. The annular chamber gl has a pipe l for connecition with a sourcekot supply, andthe sur- 'faces tobe coated is vindicatedat m2. The enlargement of the annular stream of conipressedair ejected fromv the space c2 Iis not so rapid as in Figure 2. The passages f are arranged in various inclined directions so that thecompressed air s uppliedthrough the pipe c" can more efectivelylteep the interiorof the bell .free from water.

The invention is not limited to the `par- `The nozzle is shown at a land the,

ticular examples of construction `hereinbefore described and illustrated. Anyone skilled in the art can in View of the above construction make Vthe necessary modifications according to the purpose in View withoutdeparting vfrom the scope of the invention. For example, the nozzle may be so constructed that the mass ejected therefrom is not sprayed as a closed stream but reaches the wall in a sprayed or distributed Jforni. It is also possible to supply through the compressed air pipes other vwhich for exan'iple exert a inoreetfective action on thc stream otmaterial from the nozzle.

l. The method of retaining .under water surfaces tree from water duringthe treatncnt thereof with a spray, whichconsists in encircling the spray lwith an annular shield. or curtain of gas under pressure movable laterally with the spray Vand impinging the surface around the impingement of the spray.

2. The method of retaining under water surfaces free from water during the ti.'eatment thereof with a spray, which consists in encircling the spray with an annular shield or eurtainvofgas underpressure movf able'laterally with the spray and iinpinging the surface around the impingement ofthe spray, and driving out thev water within the curtain or screen.

3. A device of the class described, including a spraying nozzle, means for encircling the nozzle with an annular screen or ,curtain of gas under pressure, ,including a substantially Ibell l,shaped .member its open end beyond ythe same, the wall oic vsaid member chambered, and having an annular outlet at ythe free edge of the ;bell,

Aand means toconnect the chamber with a source of under pressure, a. second chamber in connection with the bell delivering .within the same `by a plurality or" outlets,

and means for connecting said chamber ,to

the source. l

4;. A device Vof the class described, lincluding a spraying nozzle, means for encircling the nozzle with an annular screen or curtain of gas under pressure, ,including under pressure, the bell adjustable flongil.

tudinal ofthe nozzle. n

In testimony whereof I affix my signature. i

ARTHUR MAUFERER.

SOV

mounted yon the nozzle and ,extending .atlfmo

Images