US539986A - Linotype-machine - Google Patents

Description

No Model.)

P T. DODGE. LINOTYPE MACHINE.

No. 539,986. Patented May 28, 1895.

"FT-r V////// o 5??? I "STATES PATENT PHILIP T. DODGE, OF \VASHIEGTON, DISTRICT OF COLUMBIA, ASSIGNORTO THE MERGENTHALEItLINOTYPE COMPANY, OF NEW JERSEY.

LINOTYPE- SPECIFICATION forming part of Letters Patent No. 539,986, dated May 28, 1895.

Application filed March 23, 1895 T aZZ wh0m it may concern.-

Be it known that I, PHILIP T. DODGE, of

Washington, District of Columbia, have invented a new and useful Improvement in LinOtypeMachineS, of which the following is a specification.

In machines for casting linotypes or type bars, it is the practice to employ a melting pot for the type metal, heated by gas flames. In order that the metal may be rapidly melted before commencing operations, it is custommy to apply an amount of heat greater than is necessary to maintain the body in a molten condition. The result is, that unless the heat is reduced by diminishing'the flame, the metal is maintained at an excessive temperature, which results in porous or spongy castings, and in other objectionable results. It has been attempted to overcome this difficulty by providing the machines with cooks through which the supply of gas could be regulated by hand, to reduce the flame; but in practice it has been found that the attendants cannot be relied upon to effect the adjustment. My invention is intended to permit the use of a maximum flame during the melting of the metal in the first instance, and to automatically reduce the flame after the metal reaches the molten state; and to this end it consists in combining with the cook or other gas regulating device, automatic means for reducing which the slug or linotype is cast, and B the melting-pot, arranged to swing on the shaft C, to and from the mold, as indicated by the arrow. Beneath this pot are located the gas burners D, D, of which there may be two,

Serial No. 542,954- (No model.)

three or more, as desired, in any suitable form, and located in any suitable manner. One or more of these burners are provided with a cock E, having an arm F, which may be turned by hand in order to open it and deliver gas to its, burner in common with the others, when the maximum heat is required to melt the cold metal. The arm F is made of such form that when the pot swings forwardtoward the mold from the position shown, to the casting position, the arm will contact with a stop or projection G on the main frame or other part of the machine, the efiect being to close the cock' E and stop the flame from one burner, in the first casting action on the machine. The cock being thus closed, will so remain as long as the machine is in operation. As before in-- dicated, the form of the cook or valve and the arrangement of the devices to close the same when the machine starts, may be varied at will.

7 My invention is of courseapplicable to all linotypes and type casting machines, whatever their form, the only requirement being that some moving part of the machine shall be utilized to shutoff the gas from one burner when the machine commences its action.

'It is obvious that the controlling device may be arranged to partially close the valve instead of wholly cutting off the gas, and this whether one or more burners are used beneath the pot.

In the drawing the stop'or projection G to control the valve is located on the side of one of the justification levers, which lies in a convenient position for the purpose. The fact that this lever has a vertical motion does not interfere with its action in closing the valve as the pot swings forward.

Having thus described my invention, what I claim is- 1. In a linotype machine and in combination with the burner for heating its metal pot,

an automatic device for reducing the. flow 0 gas when the machine is started. 7

2. In a linotype machine and in combina tion with 'its melting pot, the burner to heat 5 the same a cook or valve controlling the flow In testimony whereof I hereunto set my hand, this 23d day of November, 1893, in the 10 presence of two attesting Witnesses.

PHILIP T. DODGE.

Witnesses:

THos. S. HoPKINs, XV. R. KENNEDY.

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