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Title: |
1895 Article-Curtis & Curtis Co., Pipe Threading Machine |
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Source: |
Modern Mechanism 1895 pgs 619-620 |
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Insert Date: |
11/27/2011 8:05:02 PM |
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Forbes' Die Stock — Figs. 1 and 2 illustrate the front and back views of the Nos. 1 and 1½ Forbes' die stocks, made by Curtis & Curtis, of Bridgeport, Conn. One set of dies is supplied with the machines for each of the standard threads cut, so that only six sets of dies are necessary for threading the sixteen different sizes of pipe included in the range of the No. 1 machine, and three sets for the nine sizes of the No. 1½ machine. The dies are set by turning the face-plate to the proper graduation, and any variation in the fittings may be allowed for. and the pipe cut either over or under standard size, by making the proper allowance at the graduation. When the dies are set to the proper size, the pipe is inserted through the self-centering vise at the back, with the end to be threaded against the back of the dies, and is clamped and brought central with the dies by turning the hand wheel shown on top of the machine. The crank is then put on to the square end of the pinion, shown in front of the machine, and through it the power is transmitted to the die-carrying gear; as the die is thus revolved a very slight pressure on the lever, shown on top of the machine, causes the gear to recede into the shell and the dies are fed on to the pipe. When the thread is cut to the required length, the machine is run backwards for about one turn, so as to take off any burr that the dies may leave; the dies are then drawn back and the pipe is removed from the machine. The depth of the shell allows a thread to be cut about twice the standard length, and if a still longer thread is desired, it can be cut to any length by loosening the vise and pulling the gear, with the pipe still in tho dies, forward, so as to give it a new start as many times as is required. Fig. 3 shows a heavy power pipe-cutting and threading machine on the same principle. The vise for holding the pipe is self-centering, and the dies are opening and adjustable to any variations of the fittings. |
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1895 Curtis & Curtis Co., Forbes' Die Stock
1895 Curtis & Curtis Co., Pipe Threading Machine
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