US1613119A - Method and means for coating tubes internally - Google Patents

Description

Jan. 4 1927..

c. M. NELSON METHOD AND MEANS FOR COATING TUBES INTERNALLY Filed July 12, 1924 ,JZnZ.

Patented Jan. 4, 1927.

UNITED. STATES I v 1,613,119 PATENT OFFICE.

CLARENCE M. NELSON. OF SAN FRANCISCO. CALIFORNIA. ASSIGNOR TO NATIONAL PAPER PRODUCTS COMPANY, OF SAN FRANCISCO, CALIFORNIA, A CORPORATION OF CALIFORNIA.

METHOD'AND MEANS FOR COATING TUBES INTERNALLY."

Application filed July 12,

This invention relates to tube making 111achincs, and particularly to an improved method and means for internally coating paper tu es and the like sin'iultancously with the manufacture thereof. Theprimary object of my invention'is to provide an improved method and means for performing this operation.

Paper tubes are ordinarily manufactured by spirally rolling paper stock over a stationary forming mandrel; As the tube is formed the same is forced axially off the free end of the mandrel. My invention contemplates a method and means for coating the inner surface of the tube as the same passes off the mandrel. I preferably accomplish this coating operation by spraying the said internal surface as the tube leaves the mandrel and spreading the spray equally over such surface by a rotating brush therein. It is, accordingly, a further object of my inventionto provide an improved method and means for so coating the internal surface of a tube in connection with the manufacture of the tube by spirally winding paper stock on a forming mandrel.

\Vith the above and other objects in view, my invention consists in the features of construction and operation set forth in the following specification and illustrated in the accompanying drawing. In such draw-.

ing annexed hereto and forming a part of this specification, I have shown one specific form of my invention 1n connection with a' conventional type of tube forming machine, but it will be understood that the invention can be otherwise embodied and that the drawing is not to be construed asdefining or limiting the scope of the invention; the claims appended to this specification being relied upon for that purpose.

Referring to the figures of the drawing: Fig. 1 is a front elevation of a tube forming machine, showing my invention in connection therewith.

Fig. 2 is an enlarged cross sectional view, taken on line '22 of Fig. 1.

Fig. 3 shows a detail hereinafter described.

In Fig. 1 of the drawing I have illustrated my invention in connection with a paper tube making machine of conventional type. A mandrel 1. is supported atone end in a head 2, mounted on a supporting frame 7 1924. Serial No. 725.715.

3. The tube 1 is formed on this-mandrel to be rotated from a counter-shaft 8, through a belt 9, the rotation being controlled by a" friction clutch 10 and a hand lever 11. The pipe 7 is adapted to carry the tube coating liquid and is provided with such liquid from a reservoir 12in communication therewith through a pipe 13. The liquid flow is controlled by a valve 14 and the pipe is held secured to the machine by means of a stay 15. The pipes 7 and 13 are connected by a packing gland 16 which permits rotation of the pipe'7 relative to the pipe 13. The other end of the pipe 7 is perforated at 17 and carries a felt distributing brush 18 on its extreme outer end.

The operation of-the machine is as follows: As the belts 6 operate in the direction shown by the arrows, the tube 4 is formed and forced axially off the free end of the mandrel. The valve 14 being open and the clutch 10 being closed, the pipe 7 is rotated in the direction opposite to that of the tube 4 and the coating liquid from the reservoir 12 is sprayed outwardly through the per.- forations 17. As the tube moves axially in the direction of the arrow (Fig. 1), the sprayed-portion of the tubes comes into contact with the rotating brush 18 which spreads the liquid equally over the surface of the tube. The inner surface of the tube is, therefore, equally coated with the liquid as the same comes off the mandrel. It will be understood that the thickness of such coating can be controlled by the valve 14 and by the thickness of the liquid. It should also be understood that the liquid is under pressure in the reservoir 12, whereby the same is sprayed from the perforations l'l'as defined.

What I claim as new and desire to secure by Letters Patent is: r v 1. A tube coating device comprising the combination of a mandrel adapted to sup port a tube thereon, a pipe extending through the mandrel, and a liquid containm 1,e13,11e

ing reservoir in communication with one end of the pipe, the portion of the other end of the pipe extending beyond the mandrel being perforated and disposed centrally of the mandrel to permit the flow of liquid therefrom in a manner coating the inside of the tlube therearound as the same leaves the manrel.

2. A tube coating device comprising the combination of a mandrel adapted to support a tube thereon, a pipe extending through the mandrel and projecting outwardly at the ends thereof, a liquid containing reservoir in communication with one end of the pipe, the other end of the pipe being perforated to permit the flow of liquid therefrom, a brush on the end of the pipe adjacent to the said perforations, and means for rotating the pipe.

3. A tube making device comprising the combination of a mandrel, means supporting the mandrel at one end, a spirally arranged belt passing around the mandrel and adapted to form a tube and feed the same axially ofl the free end of the mandrel, a pipe extending through the mandrel and projecting outwardly at the ends thereof, a liquid containing reservoir in communication with the end of the pipe adjacent to the said mandrel supporting means, the other end of the pipe being perforated to permit the How of liquid therefrom, a brush on the end of the pipe adjacent to the said perforations, and means adjacent to the said mandrel supporting means for rotating the pipe.

4. A tube coating device comprising the combination of a mandrel adapted to support 'a. tube thereon, a pipe extending through the mandrel and projecting outwardly at the ends thereof, a liquid containing reservoir at one end of the pipe, and a brush on the other end of the pipe, the pipe being perforated between the brush and mandrel whereby the coating liquid is sprayed therefrom onto the inner surface of a formed tube as it leaves the mandrel and thereafter spread by the brush,

CLARENCE NELSON.

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