Патент USA US2124520код для вставки
July 19, 1938. F. N. SPELLER: METHOD 2,124,520 v OF MAKING GALVANIZED FERROUS PIPE , Filed Sept. 1, 1936 // , v //,,/,///////// IN VEN TOR.‘ FE?NK' N. 5PEL LEE. Ml 2,124,520 Patented July; 19, 1938 PATENT OFFICE UNITED STATES _ 2,124,520 nm'rnon or MAKING csnvsmznn FERBOUSPIPE Frank N. speller, Pittsburgh, Pa., assignor to Na tional Tube Company, a corporation of New Jersey Application September 1, 1936, Serial No. 98,990 a ‘(01. ill-70.2) This invention relates to galvanized ferrous pipe, one of the objects being to increase the service life of such pipe. ' . of the same, this shaft being rotated by a suit able device l. The arms I may be raised into alignment with declining skids 5 which lead to According to the invention, ferrous pipe is gal-' > a series of spaced rollers 6 powered by a motor ‘I and adapted to horizontally receive the pipe 5' 5 vanized by the conventional hot-dip method ex cepting that the pipe is removed from the molten zinc in a horizontal position so as to retard the gravitational ?ow of zinc from its surfaces, the pipe being continuously rotated during the solid 10 i?cation of the zinc on its surface andcontinu ously maintained in a horizontal position until this solidi?cation is completed. Preferably, the pipe is rotated at su?icient speed to assure a uni form distribution of the zinc over its surfaces but 15 at an insu?icient speed to assure any material centrifugal e?ect on this zinc. This procedure 9 between them and rotate the same. In use, the pipe is placed in the zinc in the ' kettle ‘i for a suitable length of time and is then removed by raising the arms I, this automatically starting the pipe to rotate due‘ to the shape of 10 these_arms. Upon removal from the zinc the pipe runs relatively slowly down the skids 5 and between the rollers 6.- Here the pipe is rotated until the zinc solidi?es. The pipe is horizontal at all times and the zinc is not wiped from its 15 surfaces. 'lhe advantages of this procedure have results in the pipe having relatively heavy layers already been described. of free zinc on its surfaces and in a uniform dis Figures 3 andv 4 illustrate the pipe 8 as being provided with caps 9 which may be ?xed to the ends of the pipe in any manner, as by a, threaded 20 engagement with the same, each of these caps tribution of the zinc over its surfaces from end *9 to end and on both its inside and outside. It has been found that pure zinc provides much ’ being provided with a concentric opening it. the» zinc and iron alloy which prevails at the Assuming the pipe to be fitted with these caps junction between the zinc and .the ferrous pipe _ and handled by the apparatus illustrated by Fig 25 it covers. ‘By the above described procedure pipe ures 1 and 2 in the aforementioned manner, the is obtained having a much greater thickness of pipe receives a thicker coating of zinc inside than free zinc than can result when pipe is dipped by it does outside. Obviously, the zinc is uniformly distributed from end to end of the pipe. the usual methods. I claim: . A modification of the above may consist. in 1. A method of hot-dip galvanized ferrous pipe ' 39 providing a suitable means for retaining a pre determined amount of molten zinc inside the including dipping the pipe in molten zinc, remov ing the pipe from the molten zinc in horizontal pipe, and in then rotating this pipe .until solid i?cation of the zinc is completed. This provides position and rotating said pipe while continu for a greater thickness of zinc on the inside of ously maintaining it in a horizontal position dur 35 the pipe than can otherwise be obtained and, at ing the solidi?cation of zinc on its surfaces. 2. A method of hot-dip galvanizing ferrous the same time, assures a uniform distribution of pipe, including dipping the pipe in molten zinc, the zinc from end to end of the pipe. removing the pipe horizontally from the molten In the drawing, Figure 1 is a top plan of suit zinc while positively obstructing its ends to an able apparatus for rotating the pipe being coat 40 ed; Figure 2 is a side elevation of the apparatus extent sufficient to retain a greater quantity of of Figure 1: Figure 3 shows how the zinc may zinc inside the pipe than if the ends were completely open and rotating the pipe during solidi be retained in the pipe after it has been're moved from the usual bath of molten zinc; and ?cation of the zinc thus retained inside the pipe. 3. A method of hot-dip galvanizing ferrous Figure 4 is a sectional view taken on the line pipe, including dipping the pipe in molten zinc, 45 IV-IV of Figure 3. ' . 'l _ The apparatus illustrated by Figures land 2 removing the pipe horizontally from the molten includes a zinc kettle l adapted to contain the zinc and rotating the pipe during its removal molten zinc in which the pipe is dipped. A shaft from the zinc and thereafter until the zinc re I runs parallel one edge of this kettle and carries tained on the surfaces of the pipe is solidi?ed. ' FRANK N. SPELLER. 5° ‘arms 8 adapted to lift the pipe horizentally out _ greater protection against corrosion than does 25 . 30 35 40 .4 45 . 60 CERTIFICATE OF CORRECTION . ‘Patent No. 2,12%520. ' FRANK N. w SPELLER. July 19, 1958. I . ‘It is hereby certified that error appears in the printed specification of the above number ed patent requiring correction as. follows: ‘Page 1, second column, line 50, olaiml, for the word. "galvanized" read galvanizing; and that the said Letters Patent should'be readwith this correction therein that the same may conform to the record of the case in the Patent“ Office. Signed and sealed this 50th day of August, A, D. 1958. Henry Van Arsdale (Seal) Acting Commissioner 'of Patents.