US1990584A

US1990584A - Coating machine

Info

Publication number: US1990584A
Application number: US578084A
Authority: US
Inventors: Dolbey Norman Louis
Original assignee: Individual
Current assignee: Individual
Priority date: 1930-12-01
Filing date: 1931-11-30
Publication date: 1935-02-12
Anticipated expiration: 1952-02-12

Description

Feb. 12; 1935. N. L.'DOLBEY v COATING MACHINE Filed Nov. :50, 1931.

2 Sheets-Sheet 1 INVENTOR AZZ-L-DOL fiX TTORNEY6,

' Feb; 12, 1935.-

N. L. DOLBEY COATING MACHINE Filed Nov. 30, 1931 2 Sheets-Sheet 2 Fig. 31 v17 arm/Wag Patented Feb. 12, 1935 I UNITED STATES PATENT OFFICE Application November 30,1931, Serial No. 578,084

In Great Britain December 1, 1930 16 Claims. (01; 91-45) This invention relates tothe formation of heat now be described'by way of example with refor sound insulating coatings or of waterproofing erence to the accompanying drawings, in which and like coatings and to apparatus for use there- Figure 1 shows a. side elevation of the apparatus with. partly in section; One object of this invention is to provide a -Figure2 shows an end elevation looking from simple method of applying coatings to surfaces the left hand end of Figure 1, and such as the steel panels of rolling stock. An- Figure 3 shows a detail view of part .of the other object is to form insulating coatings conapparatus. taining a large number of small air spaces or The apparatus consists of ahopper 1 containing cells. Another object of the invention is to pro-- an endless travelling band 2 made ofleather and 10 vide an easily mobile apparatus by means of provid d w h a l r num of h k d pr s which coatings may be applied with ease to rela- 3 which protrude through the band 2 and serve tively inaccessible points of structures. to pickup and hold asbestos flbre supplied to the The invention is based upon the discovery that h pp The band 2 the asbestos a 5 the best coatings are formed, particularly when p nt bove a funnel 4 fo m integral w h the a loose fibrous material such as asbestos is used, pp 1 and i c m un cation at its base with if a suspension of the material is subjected to e u ion side of a fan 5. A brush 6 rr n d suction action. to rotate at a very high speed serves to detach In the best method known to me-of carrying the fibre from the band and simultaneously to out my invention a fibrous and/ or powdered inp it 0111? 50 that it a s in Small Particles down 20 sulating material in the form of relatively small the funnel 4'. The fan 5 also draws in any dust particles suspended in air is subjected to the formed Wh t fibres are being p Ase!!- suction side of a fan which blows the suspension 0nd brush '1 arran d to r ate at a moderate onto asurface to be coated, while atthe same time speed is placed close to the top of the band 2 so an adhesive or reagent is separately sprayed onto tha in ro at i co s to Contact with the 25 the surface. I fibre on the band and serves to control the Preferably the suspension is made by forming quantity supplied to the brush 6. the small particles in situ by means of a machine e a 5,Sh0111d be One having relatively few which opens out or disintegrates the raw material blades Spaced apart from one another, Since t and. as the particles are formed, feeds them in is found that a fan with a number of close-set 30 suspension to the fan. blades does not convey the fibre satisfactorily. The adhesive or reagent may conveniently be The fan-5 draws in the particles of fi e SuS- sprayed by means of a normal spray gun and pended in air and delivers them through a hose the insulating material may be' arranged to be 8 h vi g a nozzle A p y gun 10 o r a forced by the fan through an orifice adjacent to, type is connected to the end of the hose 8 and is 35 the n'ormal spraying orifice of the gun. In any arranged t0 p y adhesive Onto the Surface case the streams of adhesive or reagent and of inbe coated at the same time that the suspension of sulating material are so directed that they interasbestos particl is Sprayed through the nozzle mingle and impinge upon the same part of the A l t e moving parts are driven by a Small e c- 40 surface to be coated. V tric motor 11 which is connected to drive the fan 40 The preferred material for use in the present 5 and the

brushes

6 and 7 throug be Shown, invention is asbestos, but this affords certain while the endless ba d 2 is driven thl'ollgh a l diflicultiesbecause'when it is handled it tends to 1'7 which-drives a pul ey The Pu y 16 is mat and to adhere to any parts with which it co n ct d by clutch mechanism to drive a comes in contact and to clog up any machine low shaft 20,which is joumaled on a fixed shaft 4 through which it is passed. A-particular feature 38 and to which a Wheel 3 1S y This of the present invention consists in providing a wheel 37 is connected through further e machine capable of dealing with partly prepared wheels, as w lie drive the dl s b asbestos; the fibres of asbestos quickly become T e p y 16 a a clutch lining '18 w c ca be matted together and the machine opens out and pressed against a flange 19 on the hollow shaft 5 separates the individual fibres and then supplies 20. The latter passes through a flange sleeve them to the fan. 15 against which the end of the bearing surface In order that the invention may be clearly of the pulley 16 abuts. A'collar 33 is fixed on understood and readily carried into effect, one the end of theshaft 20 and a helical spring 34 apparatus for use in accordance therewith will fixed at one end to the collar 33 and at the other 55 end to the sleeve surrounds the shaft between the collar and the sleeve. A strap 39 surrounds the sleeve 15 and is connected by a Bowden wire 14 to an operating handle 13 mounted close to the end of the hose 8, as shown, or on the gun. The sleeve 15 normally rotates with the hollow shaft 20 and the pulley 16 so that when the Bowden wire 14 is pulled tight, the strap acts as a brake on the sleeve 15. The result is that a pin 35 which projects from the shaft 20 into engagement with a slot 36 in the sleeve 15 causes the shaft 20 to move axially relatively to the pulley 16 against the action of the spring 34, so that the clutch is taken out. The endless band will then stop, and delivery of the material is thus interrupted independently of the operation of the fan 5, whereby continued operation of the fan functions to prevent clogging of the material in fan 5, hose 8, and nozzle 9. As long as the strap 39 continues to grip the sleeve 15 the clutch will remain out because the sleeve 15 is held against rotation and the spring 34, which has been wound up as well as compressed, is not strong enough to cause the shaft 20, the gear 37, and the endless band 2 to rotate backwards. As soon, however, as the grip of the strap on the sleeve 15 is released, the sleeve 15 can be rotated relatively tothe hollow shaft20 by the unwinding of the spring 34, and simultaneously the latter will expand and bring the flange 19 into engagement with the clutch lining 18 again.

The supply of adhesive can be shut off at the same time as the supply of fiber, by means of a valve trigger 12 which is provided, as usual, on the spray gun 10. i

In practice it is desirable to prevent the fibre in the hopper from adhering to the sides thereof, and for this purpose two slowly moving

agitators

21 and 22 are provided in the form of metal sheets. The sheet 21 is pivoted at 23 close to the end wall of the hopper 1 and the sheet 22 is pivoted at 24 so that it lies fairly close to and approximately parallel to the endless band 2. The two

sheets

21 and 22 then form in effect the boundary walls of the hopper and are slowly rocked about their pivots through a small angle by a mechanism which consists of a rod 25 fixed to an eccentric 26 at one end and to a pivoted link 27 at the other end. The pivot 28 of the link 27 is rigidly connected to an arm 29. The latter is connected by a rod 30 to a pivot point 31 on the sheet 22, the point 31 being connected by a rod 32 to the sheet 21. The result is that an almost horizontal movement is imparted to the point 31 so that the

sheets

21 and 22 are slowly rocked about the

pivots

23 and 24 respectively. It will be seen that the fibre detached by the slowly running brush -7 is thrust downwards into the space between the band 2 and the sheet 22 and escapes into the bottom of the hopper.

The amount of fibre supplied to the fan can, of course, also be regulated by varying the speed of the endless band 2. This can easily be done by changing the gear ratio between the motor and the band.

If desired the bottom of the hopper may be enlarged or widened so as to provide ample space and thus to reduce choking or bridging of the fibre.

I'he whole apparatus may easily be made mobile by mounting it upon a frame or trolley. It thuscan'easily be taken to any point where it is required and has the great advantage that in general only one man is needed to operate it.

The invention is in no way limited to the apparatus described above, as when it is desired to disintegrate or open out the coating material in situ any other means may be used capable of forming the material into a state of sub-division sufficient to form a suspension in air which can be drawn in by the fan.

Although the invention is particularly applicable to coatings formed from fibrous material such as asbestos, animal hair, wool, cotton and so forth, which materials form extremely efficient sound insulators owing to the large number of air cells or pockets contained in the resultant coating, the invention may also be applied to the formation of coatings from such powdered substances as cork powder and boiler covering compositions. These may be cemented in position by the use of adhesive or simply of water which in this case acts as an adhesive.

Again, waterproofing coatings may be formed, for example, by spraying a bituminous emulsion onto a surface and simultaneously blowing a relatively small quantity of asbestos fibre onto the surface by means of a fan as described above.

Any suitable adhesive may be employed, but the preferred adhesive is sodium silicate of 30 Twaddell, although the concentration of sodium silicate employed in accordance with the invention may vary between 10 and 60 Twaddell. However, instead of spraying a simple adhesive through a spray gun, a solid reagent may be mixed with the fibrous or powdered material and be blown by the fan onto the surface to be coated, while a liquid reagent may simultaneously be sprayed onto the surface; for example mag nesite powder and magnesium chloride solution may be sprayed simultaneously in this way as may Portland cement and water.

1 1. In an apparatus for applying a coating to a surface, the combination of a dispersing mechanism adapted to receive loose fibrous material having a tendency to mat and to form it into a suspension of fine particles in air, a fan placed to receive said suspension and operative to drive it forwards, means for directing said suspension onto the surface to be coated, and means for simultaneously spraying a liquid onto said surface.

2. In an apparatus for applying a coating to a surface, the combination of a container for loose fibrous material having a tendency to mat, a band mounted to travel through said container and operative to take up such fibrous material, a rotary brush so placed as to be capable of detaching fibres from said band and forming them into a suspension in air, a fan placed to receive at its suction side the suspension thus formed, a conduit connected to the delivery side of said fan and adapted to discharge said suspension'onto the surface to be coated, and means for simultaneously spraying a liquid onto said surface.

3. In-an apparatus for applying a coating to a surface, the combination of a container for loose fibrous material, having a tendency to mat, a band mounted to travel through said container and operative to take up such fibrous material, a rotary brush so placed as to be capable of detaching fibres from said band and forming them into a suspension in air, a second rotary brush placed between said first brush and the receiving end of said band and adapted to limit the amount of material carried by said band to said first rotary brush, a fan placed to receive at its suction side the suspension thus formed, a

conduit connected to the delivery side of said fan and adapted to discharge said suspension onto thesurface to be coated, and means for simultaneously spraying a liquid onto said surface.

4. In an apparatus for applying a coating to it forwards, a conduit connected to the delivery side of said fan and' prdvidedwith a discharge nozzle, and a spray gun attached to said nozzle and adapted to spray liquid onto the surface to be coated simultaneously with said suspension.

'5. In an apparatus for applying a coatingto a surface, the combination of a container for loose band mounted to travel through said container fibrous material having a tendency to mat, a

and operative to take up such-fibrous material, aro'tary brush so placed as to be capable of detacbing fibres from said band and forming them into a suspension in air, a fan, a nozzle, a conduit connecting said fan and said nozzle, said fan being adapted torec'eive material delivered by said dispersing mechanism and urge it through said conduit and'nozzle, a spray gun attached to said nozzle and so located that liquid issuing from said spray gun and material issuing from said nozzle can be causedto impinge simultaneously on substantially the same part of a surface to be coated, driving means for said travelling band, said rotary brush and said fan, a clutch interposed between said driving means and said travelling band, a control trigger for said spray gun mounted upon said spray gun, and an operating handle adapted to control said clutch viii) and mounted close to said control trigger.

6. In an apparatus for applying a coating to al surface, the combination of a dispersing mechanism adapted to receive loose fibrous material havinga tendency to mat and to form it into a suspension of fine. particles in air, a fan having blades located a substantial distance apart from one another'and placed to receive said suspension and operative to drive it forwards, means for directing said suspension onto the surface to be coated, and means for simultaneously spraying a liquid onto said surface.

'7. In an apparatus for applying a coating to a surface, the'combination of a container for loose fibrous material having a tendency to mat, agitating means within said container,; a dispersing mechanism adapted to receive the fibrous material from said container-and deliver it as a fine suspension in air, means for conveying the fibrous material from said container to said dispersing mechanism, a fan placed to receive said suspensiori and operative to drive it forwards, means for directing said suspension onto the surface t0 be coated, and means for simultaneously spraying a liquid onto said surface.

8. In an apparatus for applying a'coating to a surface, the combination of a; container for loose fibrous material having a tendency to mat, re-

ciprocablewalls within said container for agitating material therein, a dispersing mechanism adapted to receive the fibrous material from said container and deliver it" as a fine suspension in .air, means for conveying the fibrous material from said container to said dispersing mecha-' nism, a fan placed to receive said suspension and operative to drive it forwards, means for directing said suspension onto the surface to be coated, means for simultaneously spraying a liquid onto said surface, and a motor connected to reciprocate saidwalls and drive said dispersing mechanism and said fan. I

9. In an apparatus for applying a coating to a surface, the combination of a container for loose fibrous material having a tendency to mat, a hopper located adjacent said container, a band mounted to travel through said container and operative to take up the fibrous material, a rotary brush so placed as to becapable of detaching fibres from said band and forming them into a suspension in air inside said hopper, a fan having its suction side connected to the base of said hopper and adapted to convey said suspension forwards, a-conduit connected to the delivery side of said fan and adapted to discharge said suspension onto the surface to be coated, andjmeans for simultaneously spraying a liquid onto said surface. 1

10'. In an apparatus for applying a coating to a nism adapted to receive loose fibrous material having a tendency to mat and to form it into a suspension of fine particles in air, means for exerting suction pressure on. said suspension whereby to drive it forwards, means for directing said suspension on to the surface to be coated, and means for simultaneously spraying a liquid on. to said surface.

11. In an apparatus for applying a coating to a surface, the combination of a dispersing mechanism adapted to receive loose fibrous material having'a tendency to mat and to form it into a suspension of fine particlesin air, means for delivering such material to said dispersing mechanism-means for exerting suction pressure on said suspensionwhereby to drive it forwards, means for directing said suspension on to the surface to be means and forming them into a suspension in air, means for exerting a suction pressure on said suspension thereby to drive it forwards, means be coated, and means for simultaneously spraying a liquid on to said surface.

13. In an apparatus for applying a coating to a surface, the combination of a dispersing mechanism adapted to form loose fibrous material A having a tendency to mat into a suspension of fine particles in air, means for supplying such \for directing said suspension on to the surface to material to said dispersing mechanism, means for controlling the quantity of such material supv plied to said dispersing mechanism, a fan placed to receive said suspension and operative to drive it forwards, means for directing said suspension on to the surface to be coated, and means for simultaneously spraying a liquid on to said surface.

14. In an apparatus for applying a" coating to a surface, the combination of a dispersing mechanism adapted to form loose fibrous material having a tendencyto mat into a suspension of fine particles in air, means for supplying such material -to said dispersing. mechanism, means for controlling the quantity of such material su'pplied to the dispersing mechanism, means for, exerting suction pressure on said suspension whereby to drive it forwards, means for directing said suspension on to the surface to be coated, and means for simultaneously sprayinga liquid on to said surface.

15. In an apparatus for applying a coating to a surface, the combination of a dispersing mechanism adapted to receive loose fibrous material having a tendency to mat and to form it into a suspension of fine particles in air, means for delivering such material to said dispersing mechanism, a fan placed to receive said suspension and operative to drive it forwards, means for directing said suspension on to the surface to be coated, means for controlling the operation of said material delivering means independently of the operation of said fan, and means for spraying a liquid 'on to said surface to be coated simultaneously with said suspension.

16. In an apparatus for applying a coating to a surface, the combination of a dispersing mechanism adapted to receive loose fibrous material having a tendency to mat and to form it into a suspension of fine particles in air, means for delivering such material to said dispersing mechanism, a fan placed to receive said suspension and operative to drive it forwards, a conduit connected to the delivery side of said fan and-provided with a discharge nozzle, means operatively related to said nozzle for interrupting the actuation of said material delivering means independently of the actuationof said fan, and a spray gun attached to said nozzle and adapted to spray liquid on to the surface to be coated simultaneously with said suspension.

NORMAN LOUIS DOLBEY.