US856815A - Gas-governor for type-machines and the like. - Google Patents

Description

No.856,815, PATENTED JUNE 11, 1907.

0. w. SEAWARD;

GAS GOVERNOR FOR TYPE MACHINES AND THE LIKE.

APPLICATION FILED I'EB. 26, 1906.

\X/ITNESS E5:

261106116 3/ @WPMM UNITED STATES ra'rnrrr OFFICE.

CHARLES W. SEAWARD, OF MALDEN, MASSACHUSETTS, ASSIGNOR TO 0. W.

SEAWARD COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF NEW YORK.

Specification of Letters Patent.

Patented June 11, 1907.

Application filed February 26, 1906- Serial No. 302,858-

To all whom it may concern.-

Be it known that I, CHARLES W. SEAWARD, a citizen of the United States, residing at Malden, in the county of Middlesex and State of Massachusetts, have invented a certain new and useful Improvement in Gas-Gov ernors for Type-Machines and the Like, of which the following is a specification, referencebeing had therein to the accompanying drawings.

The invention relates to a new and useful method of and apparatus for regulating the temperature of molten metal or heated liquid which is heated by gas or steam or other means in which the source of heat passes through a pipe.

The invention is specially intended for application to machines for making type in which the metal is melted in a pot and run out as desired, it being important to maintain the molten metal at as nearly a uniform temperature as possible, preferably about 510 degrees.

It is a somewhat common thing to have the gas pass through a tube having an outlet passage to the burner which may be more or less closed by the rise and fall of mercury in a chamber into which the gas tube dips, but

in all such apparatuses so far as known to me the mercury chamber or tube has been exposed to the direct heat of the burning gas, and the supply of gas is varied according to the heat generated in the mercury chamber directly by the gas irrespective of the temperature of the metal. In other words, it serves to regulate the supply of gas and keep it constant within certain limits, and may or may not keep the molten metal at a fixed temperature. f the quantlty of'the molten metal in the pot was a ways the same, and if there were no outside influences to affect the tem erature of the metal, the old method wou d work fairly well, but where the quantity of the molten metal varies, a greater supply of gas is required to keep the metal at a given temperature when the pot is full than when the. pot is only half full, and where the temperature of the atmosphere varies or from other causes a larger supply is required to maintain an even temperature of the metal, the oldmethod fails. Therefore the end to be sought is not to maintain a constant fixed supply of gas, but to maintain a fixed temto raise the temperature, t esupp y of gas will be reduced to the necessary amount.

The object of the present invention is to have the temperature of the liquid directly and automatically control the supply of gas, and the invention consists in having the rise and fall of the mercury control the size of the feed aperture for the gas and have the mercury tube dip into the heated li uid so that the rise and fall of the mercury s all be ilirecgly controlled by the temperature of the iqui The. invention will now be fully described, reference being had to the accompanyin drawings, and the novel features thereof wil be particularly pointed out in the claims at the end of the specification.

In the drawin s,Figure 1 is a side elevation, artly bro en away, of an apparatus embo ying the invention. Fig. 2 is a vertical section in detail on a larger scale than Fig. 1 showing the mercury tube and governor chamber. Fig. 3 is a vertical section of the governor chamber on a still larger scale. Fi 4 is a cross section on line 44 of Fig. 3.

n the drawings,1 is a metal pot provided with a jacket 2 having a cover 3' and suitable supports and vents and draw hole of well known construction, all of which do not form a part of the present invention but simply illustrate one form of machine with which apparatus embodying the invention is adapted to be employed.

4 represents the molten metal in the metal ot. p Amercury tube 5 closedat the lower end terminates at its upper end in a shell or head 6 which for convenience of construction is what larger n diameter than the lower portion which connects with the tube 5.

When there is heat on, the mercury 22 should fill the tube to about the line"23 shown in Figs. 2 and 3 covering the lower end of the tube 10, but not entirely covering the slits 21.

The top member 8 is a tubular shell having a bore of varying diameters. It is tapped out at its lower end of large enough diameter to screw onto the threaded upper end 7 of the head of the mercury tube and forms a tight joint. The upper portion of the bore of the shell 8 is tapped out for screw threaded connection with a hollow adjusting tube 10.

The tube 10 is closed at its upper end. It is open at its lower end and the bore 24 extends up to some point above the side port 11. In the side of the tube 10 is a port 11 leading out from the interior bore of the tube. The shell 8 is formed with an annular chamber 12 with which the port 11 will register, the said chamber being of sufficient length to permit adjustment of the tube 10 up and down somewhat and still be sure of the port 11 always opening into said chamber. OD the side of the shell 8 is a nipple 14 having a passage 13 connecting with the inlet port 11, and the nipple has connection with the gas supply tube 15.

At some distance below the annular cham ber 12 is another .annular chamber 16 provided with an exit port 17 which is connected by a nipple 18 with a gas tube 19 leading to the burner 20 beneath the metal pot.

The lower portion of the tube 10 below the threaded portion is of reduced diameter where it passes through the annular chamber 16. The lower end of the tube 10 is open, and also there are one or more slits 21, preferably two, in the sides of the tube extending back from the open end so that when the mercury closes the end of the tube there will still be an outlet for the gas through the slits.

The tube 10 being screw threaded is adj ustable longitudinally by turning so as to adjust the end of the tube relatively to the level of the mercury. It may be turned by hand, or by a pin inserted in the hole 25 in the solid upper end of the tube.

When the mercury is cold the level should stand at some distance below the lower end of the tube.

The gas enters through the main supply pipe 15 and port 13 into the annular chamber 12, thence through the port 11 into the valve tube 10, and passes down through the tube 10, and out into the chamber 16, thence through port 17 and nipple 18 to tube 19 which leads to the gas burner 20.

When the mercury is cold, the level being below the tube 10, the gas Will flow freely through the end of the tube 10, and liberally supply the burner.

As the metal in the pot becomes heated, the mercury tube will also become heated and the mercury will rise, closing the mouth of the tube 10, and reducing the supply of gas to the small quantity that can pass This can be easily regu begins to fall, the mercury will begin to drop and permit a larger flow of as before the temperature of the metal has dropped to any great extent, thus causing a larger flame and raising the temperature again, or counteracting the tendency to drop. By this means the tem erature of the molten metal in the pot is se if governing and can be maintained constant within a very small margin, whatever be the variation in the quantity of metal in the pot or outside influences.

A branch gas pi e 26 leads from pipe 19 to a burner (not s own) at the head of the metal pot if desired for an auxiliary heater. Stop cocks 27, 28, are provided to shut off the gas from either burner if desired.

A bracket 29 secured to the jacket supports the mercury tube.

In connecting up the ap aratus, the mercury tube 5 is inserted in t e bracket holder 29 and clamped by the set screw 30. Then the top portion 8 of the governor is unscrewed and removed and the mercury is slowly poured into the mercury tube through the 0 en top of the shell 6 until it rises in the cliambered portion of the shell 6 to a point somewhat below the line 23 so-that when the up er shell 8 is screwed onto the lower shell the lower end of the adjusting tube 10 will be a little above the level of the meroury when there is no heat on. The upper shell 8 is then screwed on to the lower shell. The adjusting tube 10 can then be turned to raise or lower it if necessary to bring the lower end of the tube to the proper height with relation to the level of the mercury. The gas tubes can then be connected and the gas turned on to allow passage through the governor and tube to the burn ers. The gas is then lighted, and after the metalis ,melted and heated to the required temperature, if it is found that the metal is running either too hot or too cold, the tube 10 may be turned up or down as necessary to make the required adjustment. When once adjusted the temperature of the molten metal will regulate the supply of gas so that the temperature .of the metal will remain almost constant and it will run continuously Without any re-adjustment by hand.

While I have described the invention as applied to use in connection with a lin'otype IIS machine, it is obvious that it is adapted for and intermediate ports and passages to the tube 19, and instead of a gas burner at the end of the tube 10, the hot steam could be projected against the pot.

I claim as my invention:

1. In a linotype machine or kindred ma chine, the herein described apparatus for automatically controlling the temperature of'the molten metal for casting type, said apparatus comprising a melting pot, a tube containing mercury extending down into the interior of the melting pot and immersed in the molten metal in the pot, a chambered head with which the upper end of said mercury tube is connected, said head bein formed with two chambers and provide with a passage connecting said two chambers, said mercury tube entering into the lower one of said chambers, a hollow adjustable tube closed at its upper'end and open at its lower end and extending through the upper chamber in said head and through said connecting (passage between the chambers and into sai lower chamber, said adjustable tube being provided with a slit in the side thereof extending from the lower end some distance upward, a gas supply tube leading into said upper chamber, said adjustable tube being provided with a port which leads from said upper chamber into the interior of said adjustable tube, whereby the gas may pass from said feed tube through the upper chamber and adjustable tube into the lower chamber, said adjustable tube filling the passage between said chambers and cutting off communicationbetween them exce t through said tube and port, a gas burner tu e leading from said lower chamber and a gas burner connected with said burner tubein proximity to said melting pot, whereby the temperature of the molten metal controls the rising and falling of the mercury and thereby regulates the amount of gas passin through the burner. 2. In a linotype mac e or kindred machine, the herein described apparatus for automatically controlling the temperature of the molten metal for casting type, said apparatus comprising a meltin pot, a tube containing mercu extending down into the interior of the me ting pot and immersed in the molten metal in the pot, a chambered head with which the upper end of said mercury tube is connecte formed with two chambers and provided with a passage coimecting said two chambers, said mercur tube entering into the lower one or said 0 iambers, a hollow adjustable tube closed at its upper end and 0 en at its lower end and extending throu the upper chamber in said head and through said connecting passage between the chambers and into said lower chamber, said adjustable tube being provided with a slit in the side thereof extending from the lower end some distance upward, a gas supply tube leadin into said upper chamber, said adjustable tu e being provided with a port which leads from said u er chamber into the interior of said adjusta ble tube ,whereby the gas may pass said head being 1 from said feed tube through the upper chamber and adjustable tube into the lower chamber, said adjustable tube filling the passage between said chambers and cutting off communication between them except through said tube and port, a gas burner tube leading from said lower chamber and a gas burner connected with said burner tube in proximity to said melting pot, whereby the temperature of the molten metal controls the rising and falling of the mercury and thereby regulates the amount of gas passing through the burner, said head comprising two shells havin screw threaded connection with each 0t er, one of which is formed with a passage through which the mercury tube enters the mercury chamber, and the other of which which the adjustable tube enters the head, said head being formed with nipples on the is formed with a threaded passage through side connected with said chambers and adapt-

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