US1236524A - Draft indicating and recording gage. - Google Patents

Description

A. awlLsoN. DRAFT INDICATING A'ND RECORDING GAGE.

APPLICATION FILED 0CT.13, 1915.

Patented Aug. 14, 1917'.

NIT STAT@ PAINT FIFIQE.

ALVAI-I F. WILSON, OF CINCINNATI, OHIO, ASSIGNOR E ONE-HALF T0 JAMES H. IVIGCABE, 0F CINCINNATI, OHIO.

:DRAFT INDICATING v.AND RECORDING GAGE.

Specicaton of Letters Patent.

Patented Aug. 14, 191'?.

To aZZ whom t may concern.'

Be it known that I, ALVAH F. WILSON, a citizen of the United States, and aresident 0f the city of Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Draft Indicating and Recording Gages, of which the following is a full, clear, and

exact description, reference being had to h novel construction and arrangement of parts whereby the variations of pressure are indicated on an enlarged scale directly from the variations of height of a column of liquid without the necessity of any multiplying gears or complicated mechanism, and in which a very simple and effective means `is provided.

In the drawing,

Figure 1 is a front elevation of my gage with the front door partly broken away not showing the chimney gage connections.

Fig. 2 is a horizontal section.

Fig. 3 is a vertical section of the operating mechanism for the indicator gage, showing the lever for the recording damper gage, but none of its connections.

The working parts are inclosed in a box or casing 1, rectangular in shape, and provided with a front door 2 for access to the working parts, and also with a lateral casing 3 for the indicating dial and indicating hands.

Mounted in the bottom of the case are the two vessels 4, 5, connected by the tube 6, in which vessels is placed the liquid, preferably oil, 7, adapted to be acted upon by the air suction.

The container 4 is closed at the upper end' and connected by the tube 8 with the coupling or nipple 9, which extends through the wall of the casing, and with which con- MGi-i011 iS made with a draft tube l@ .openE ing into the furnace at the point the air suction is to be taken. The other vessel 5 is open at the top and is provided with a float 12. The float 12 is suspended by the rod 13 pivoted at 15 to the lever arm 14. This lever arm is pivoted to the casing at 16, and extends out laterally through the casing 3 behind a sight opening where a dial 17 is provided and where the lever is provided with a pointer 18. The ratio of distances between the pointer 18 and the fulcrum of the lever 14 and between said fulcrum and the connection with the rod 13 is about 30 to 1, so that a very slight movement of the float will be indicated clearly on the dial.

In order that the gage may be read from either side, as the furnaces may be arranged in gangs, and a gage provided extending out from the front face plate for each furnace, the casing has a window 45 on each side, and the scale is imprinted on both sides of the dial. The lever 14 is provided with an additional pointer 46 for the opposite side of the dial.

The lever arm 14 is provided with a counter weight 19 screwthreaded on the inner end of the arm so as to adjust the weight with reference to the float.

.Pivoted to the casing above the lever 14 is a finger arm 2O provided with a pen or pencil 21, whose point bears on a disk 22 furnished with a record sheet. The disk is mounted on the central shaft 23 and is driven slowly by clock work, not shown. The finger 20 is coupled to the lever arm by the connecting bar 24, so that the position of the lever arm as affected by the movenient of the iioat will be recorded on the record sheet.

It will be evident that with liquid in the vessels 4 and 5 and the tube 6 connecting J[he two vessels, the suction through the draft tube 10 will tend to form a vacuum in the vessel 4 and air pressure on the ioat will cause the float to descend and the pressure to be indicated on the dial and also on the record sheet.

It will also be evident that when in use, evaporation would affect the level of the liquid in the pressure vessels, and the result would be that this would affect the accuracy of the gage.

In order to maintain a constant level and prevent evaporation destroying the accuracy of the gage, I provide an accumulator vessel 25 located above the tube 6 and provided with several small openings 27 in the bottom of the vessel opening into the tube. An air opening 28L is provided through the side of the vessel 25, and the oil or other liquid is poured into this vessel up to the air opening and thus fills the vessels 4 and 5 to the same level. An air tight cap or plunger 28 is provided for the accumulator, screw threaded on a central pin 29, so that the cap can be always maintained in a position resting on the oil in the accumulator, and to maintain an air tight fit of the cap, it is provided with a sealing washer 30.

Small openings 27 are provided for the passage of oil from the accumulator, so that the movement of the oil into and out of the accumulator shall be slow to prevent vibrations in the level of the liquid as the level is affected by the air draft. If the oil from the accumulator had an unobstructed passage into the tube 6, the tendency would be to cause a momentary raising and lowering of the liquid in the ioat chamber until the new level was obtained, caused by the exhaustion of the air from the vessel 4. I have found that the small openings prevent this tendency to vibration, and I am inclined to believe that the result of the small holes is that the accumulator will act as a retarder. I have proven by actual tests, however, that the large hole from an accumulator causes vibration, and a small one or small ones do not do so.

As the gage is intended for a draft gage in a furnace to determine that the grate fire is maintained in proper condition, the fireman might maintain a proper level for the gage, not by regulating the fire, but by regulating the damper in the flue. Therefore to record the fact that the draft through the flue is properly maintained, I provide in connection with the draft gage, a similar gage for the draft in the fines. The vessels 4, 5 and 25 are duplicated in the back of the case at 31, 32 and 33, with `an outlet from vessel 32 through the nipple 34 and tube 35 to the flue. A float 36 is provided connected to the lever 37, pivoted to the casing and provided with a counterweight 38, and this lever is coupled by the connecting bar 39 the same having an elbow therein (Fig. 2) to the finger 40, carrying a pen or-pencil 41, which also bears on the record sheet on the disk 22. ,It will be obvious that with this construction the draft in the damper will be also registered on the record sheet, and by reading both records together it can be determined whether there has been Y any manipulation of the fiue dampers, in

order to obtain the proper draft through the grate bars. p

In order that the reman may have ,.SOIIlGf thing to indicate the proper pressure to be maintained for the furnace draft, I provide an indicating pointer 42, mounted on the turn button 43, so that this pointer can be set in the proper position. This pointer shows on each side of the dial, as shown in Fig. 2.

In lsetting up the gage for use, the accumulator is filled with oil to the air opening and then the cap is screwed down so that the accumulator is filled with oil without any air space. As I have already pointed out, itis evident. that evaporation would cause a diminution of the amount of oil or liquid in the device, and this would of course change the level of the float and the position of the indicating lever. Therefore as evaporation takes place, the cap of the accumulator is given a slight downward turn to bring Vbaclr the level of the oil in the iioat chamber to the proper position.

Having thus described my invention, what thereon, a scale in the arm visible from both sides thereof, an indicator lever in said arm, pointers on the lever adapted te lie over each side of the scale to show thereupon from both sides of the arm, and a gage in said casing having liquid reservoirs, and means operated thereby for controlling the lever, whereby said arm may extend out from a furnace for easy reading of the indications.

2. In a device of the character described, the combination with a casing, a laterally extending arm thereon, an indicator in the arm, a draft gage in the casing comprising a closed cylinder having connections for a pipe to a draft flue, an open cylinder hav-l ing a float therein connected with the indicator, a passage betweeen said two cylinders, an accumulator cylinder lcommunicating with said passage for maintaining an oil A level in the cylinders, a recording arm connected to the indicator arm, a gag'e comprising like cylinders, passages and accumulator set in said casing alongside of the first mentioned gage, a recording arm operated by said gage, a single chart for both recording l means forming a passageway between them, one receptacle sealed from and the other open to the air, a float for the open Vessel, and means for connecting a draft pipe t0 the closed Vessel, and a liquid in the receptacles adapted to change its level with variations in the suction on the draft pipe, an inde- Copies of this patent may be obtained for ve cents each, by addressing the Washington, D. C.

pendent sealed reservoir with liquid to fill the same, there being passageways therefrom to the passageway between the receptacles, and an adjustable cap to force the liquid from the reservoir into the receptacles as the quantity decreases by evaporation. ALVAH F. WILSON Commissioner of Patents,

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