US1907034A

US1907034A - Process and apparatus for treating coated articles

Info

Publication number: US1907034A
Application number: US340226A
Authority: US
Inventors: Arthur O Austin
Original assignee: Ohio Brass Co
Current assignee: Ohio Brass Co
Priority date: 1929-02-15
Filing date: 1929-02-15
Publication date: 1933-05-02
Anticipated expiration: 1950-05-02

Description

y 1933- A. o. AUSTIN 1,907,034

PROCESS AND APPARATUS FOR TREATING COATED ARTICLES Filed Feb. 15, 1929 I N VEN TOR 692% LM Hus 7 /77 Y WA @M (A TTORNEY Fatented May 2, 1933 UNITED STATES PATENT OFFIC ARTHUR O. AUSTIN, 0F NEAR BAR-BERTON, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE OHIO BRASS COMPANY, OF MANSFIELD, OHIO, A CORPORATION OF NEW JERSEY PROCESS AND APPARATUS FOR TREATING COATED ARTICLES Application filed February 15, 1929.

This invention relates to the process and apparatus for treating coated articles such as metal articles that have been galvamzed and coated with other material.

One object of the invention is to reduce or restrict/the thickness of the coating over portions of the coated article while leaving a thicker portion over other portions,

Another object of the invention is to prevent clogging of threads on a threaded article by a coating material.

A further object is to remove a portion of the coating material from a coated article and to establish a rotary movement of the material to prevent the material from agaln adhering to the article.

A further object is to remove excess coating and at the same time subject the artlcle to a heat treatment.

Other objects and advantages will appear from the following description.

The invention is exemplified in the combination and arrangement of parts shown in the accompanying drawing and described in the following specification, and it is more particularly pointed out in the appended cla ms.

In the drawing:

Fig. 1 is a plan view of one form of apparatus for practising the present invention.

Fig. 2 is an elevation of the form shown 1n Fig. 1 with parts in section.

In the galvanizing of metal parts, particularly those having threaded portions, it is exceedingly diificult to remove the excess material from the threaded parts without correspondingly reducing the amount of coating on all other parts. Centrifugal methods have been used to remove excess coating material but these methods are open to the above objection and some body portions of articles centrifugally treated frequently have a thinner coating than desired.

In many articles where it is desired to provide' an ample coating so as to resist water, it is advantageous to reduce the excess material upon the threaded portion only or upon portions where fairly close fits are required and excess material would be objectionable. In order to obtain this result, a new method has been devised.

- tion.

Serial No. 340,226.

In the apparatus illustrated in the drawing, a blast chamber 10 is provided with ports 11 which allow a strong blast of gas or air from the chamber 12 to strike upon any object passed down through the opening 13. The chamber is supplied by connecting pipes 14 and a regulating valve 15. The galvanized article 16 is passed down through the opening 13 into the blast chamber 10 while the zinc or other coating material is in molten condi- The strong blasts which enter in a tangential direction blow the excess material oil and the centrifugal force tends to keep this material towards the outside of the chamber until cooled so that it will not fall back on the piece 16 and be refused, forming a lump. The conical shape of the chamber permits the escape of the blast downward as the gas or air expands and also permits any coating material which may be deposited on the side to drop freely. In case the material should stick, it is comparatively easy to loosen this so that the chamber will not become clogged.

In many operations air and steam may be used. This is particularly true where the objects are well treated and the amount of material removed need not be very great. In some instances, a super-heated air or gas such as a non-oxidizing gas is desirable and in others a combustible mixture may be used to advantage. A combustible mixture may be used to produce a flame that will keep up the temperature. The hole chamber may also be heated by any suitable means. In some cases the chamber may be rotated so as to strike all sides of the piece or the piece or Work rotated as it passes through.

It is evident that the principle may be used for a variety of cases and is particularly efiicient for removing excess coating material from many pieces of Work. Pieces of structural steel may be cleaned by passing through a series of cleaning jets, part of which may be heated and part of Which used for cooling. Following the cooling jets, the material may be further setby a spray of Water or other cooling medium. Where the material can be handled rapidly, the jets may be used for removing excess material and chilling so that the material may be readily handled as it leaves the apparatus without breaking through the coating. It is, of course, evident that after excess material is removed the surface may be allowed to come to the melting temperature of the coating material by heat stored Within the object or by applying additional heat. the surface and remove any marks if such exist due to handling.

I claim:

1. In a coating operation, the steps of subjecting a coated article to a whirling blast to remove excesscoating from the surface of the article, moving the excess material outwardly and away'from and out of contact with the article by centrifugal action set up by said blast.

2. In a coating operation, the steps of injecting a blast tangentially into a circular chamber to produce a whirling current within the chamber and introducing a coated article into said chamber with the coated surface thereof exposed to said blast at the portion of said chamber where the blast enters said chamber to cause said current to remove excess material from said article.

3. In a coating process, the steps of directing a blast against the surface of a cylindrical article transverse to the axis thereof and substantially tangent to said surface while said article is confined within a walled chamber, and creating a whirling motion of said blast in said chamber the cylindrical surface of said article being exposed to the whirling blast, the blast being of suflicient velocity to remove excess coating material from the surface of said article by centrifugal force set up in said coating material by said blast.

4. In a coating operation, the steps of introducing an article having melted coating material on the surface thereof into a passage, directing a blast against the surface of said article at an oblique angle thereto and of sufficient strength to produce a whirling motion in said passage and throw the excess coating material outwardly away from said article by centrifugal force set up in said excess material while the material is within said passage to produce a whirling motion in said passage, and heating the walls of said passage to prevent the coating material from adhering thereto.

5. In a coating operation, the steps of introducing an article having melted coating material on the surface thereof into a passage having outwardly. and downwardly flared side walls, directing a heated blast into said passage in a tangential direction to set up a whirling movement in said passage to facilitate removal of said coating material from said article and to heat the wall of said passage to prevent the material from adhering to said wall.

6. In a coating operation. the process of directing a blast against a threaded surface This tends to smooth at an oblique angle to-said surface to create a circular movement about said surface for removing excess coating material from said surface.

7. In a coating operation the steps of'directing a heated blast against a threaded surface substantially tangential to said surface to remove excess coating material from said surface.

8. In a coating operation, the steps of directing a blast against a threaded surface in a direction substantially tangential to said surface, and confining said blast to produce a whirling movement about said surface.

9. In a coating operation, the process of introducing a threaded article into a circular passage and introducing a blast into said passage about said article in a tangential direction, the direction of the blast being inclined in the direction of the axis of said passage to produce a whirling current traveling longitudinally through said passage.

10. In a coating operation, the process of introducing a coated article into a passage and setting up a blast in said passage having a whirling motion and a motion in the direction of the length of said passage to remove excess coating material from said article and to carry said excess material out of said passage said article being exposed to said blast at the point of entry of said blast into said passage.

11. In a coating operation, the process of introducing a coated threaded article into a tapered passage and directing a blast tangentially against the surface of said article and inclined longitudinally thereof toward the larger end of said passage to produce a whirling movement about said article in said passage traveling toward the larger end of said passage, to remove excess coating material from said article and to carry said excess coating material out of said passage.

12. Apparatus for removing excess coating material from a coated article, comprising a member having a passage therethrough, said member having a tangentially directed port for directing a blast into said passage in a tangential direction, said passage being open at the point of entry of said blast to permit the blast to impinge against a coated article in said passage at a point in said passage registering With said port.

13. Apparatus for removing excess coating material from a coated article, comprising a member having a tapered passage therethrough, and means for directing a blast in a tangential direction into said passage and toward the larger end of said passage.

14. Apparatus for removing excess coating material from a coated article, comprising a member having a tapered passage therethrough, and means for directing a heated blast tangentially into the interior of said passage and in a direction toward the larger end of said passage.

15. Apparatus for removing excess coating material from a coated article, comprising means having a passage therethrough for receiving the coated article, said means having a tangentially directed port for directing .a flame in a tangential direction into said passage, said passage being open opposite said port to permit the blast as it enters through said port to be directed by said port against the surface of said article to heat the coating material of said article and to impart a whirling movement thereto.

16. Means for removing excess coating material from a coated article comprising a chamber having an opening at one end for the insertion of an article to be treated, said chamber having a port for directing a blast into said chamber in a tangential direction and away from said opening, the walls of said chamber being spaced outwardly from the article being treated to permit excess material to be thrown outwardly from the portion of the article within said chamber by the lc)entrifugal action of the blast in said cham- 17 The process of removing excess coating material from a coated article comprising the steps of directing a blast against said article and moving said article past said blast, said blast being directed in the direction of move ment of said article to cause the excess coating material to move longitudinally of said article toward the cleaned portion thereof,

said blast having a whirling movement to impart centrifugal force to the excess coating material to prevent said excess material from adhering to the cleaned portion of the article.

18. The process of removing excess coating material from a limited portion only of a coated article comprising the steps of moving said portion past a blast directed against the article, the blast being directed toward the cleaned end of the article to prevent the material from adhering to the portion of the article not subjected to the cleaning process.

19. The process of removing excess coating material from a portion only of a coated article comprising the steps of directing a blast against the article, the blast being directed in a tangential direction relative to the article to prevent the coating material from re-engaging the cleaned portion of the article,

and also being directed longitudinally of the article away from the uncleaned portion of the article to prevent the excess material from ailhering to the uncleaned portion of the artic e.

In testimony whereof I have signed my name to this specification this 14th day of February, A. D. 1929.

ARTHUR o. AUSTIN.