US1695846A - Liquid-level control - Google Patents

Description

' Dec. 18,1928. 1,695,846

L. H. HARDING LIQUID LEVEL CONTROL Filed Sept. 21. 1926 INVENTOR Wad/56.36%? wma LULZZLQ ATTbRNEY Patented Dec. 18, 1 928.

UNITED STATES.

PATENT OFFICE.

. LEONARD H. HARDING, OF BROOKLYN, NEW YORK.

LIQUID-LEVEL CONTROL.

Application filed September 21, 1926. Serial No. 136,782.

A further feature is in theprovision of 15 means adjustable on the rod and operative in a sealed casing, whereb a snap switch is positively actuated into eitl ier. of its operative positions, avoiding the possibility of a partial or incomplete action.

Another aim is to enclose the rod, switch and actuating devices in such manner as to prevent it from being molested or tampered with.-

These and other minor advantages, which will become more fully evident as the descrip tion proceeds; are accomplished by the construction, arrangement and combination of the few and simple parts hereinafter described and illustrated in the accompanying drawing, forminga material part of this disclosure, and in which Figure 1 is a general sideelevational view of an embodiment of the invention as installed.

5 Figure 2 is an enlarged vertical sectional view of the upper part of the structure as assembled. v

In the drawing, the numeral 5 designates in general a conventional type of tank, such for instance as is frequently used for fire protection on top of buildings, but which ma also represent a. well or sump from whic it is required to draw off a portion of its liq- 'uid contents when the same has reached a predetermined level.

Above the main portionof the tank or sump is a chamber 11 divided usually by a flooring or partition 12, the liquid 13 obviously being in the lower portion of the tank.

Fixed on the flooring 12 is the flange of a collar 14 having a set screw to .adjustably retain a tube 15, passing through the flooring any desired distance into the tank and having fixed at its upper end a' casing comprised of two opposed like parts 16 and 17, their flanged meeting edges having between them a gasket 18 held tightly by the clampinggscrews 19.

assin vertically through the casing side 16 is a ro 2O loosely surrounded by the guard tube 15 and extending into the tank 10.

Adjustably fixed on the lower portion of the red are collars 21 and 22, respectively upper and lower, and between the collars is .a tube 23 forming the axis of a spherical float; 24 in which the tube is hermetically sealed.

The float rests on the liquid 13 and may be weighted as at 25 to enter a suitable distance into the li uid, the float and its tube being freely slida le on the rod 20.

The upper portion of the rod is'slidably guided in the upper and lower walls of the casino through lubricated stuffing boxes 36 and 3 7, respectively upper and lower, set in the casing 16 and fixedly attached to the rod is a spool 26 having annular flanges at its ends the lower normally resting on a spacer sleeve 27 seated on the lower wall of the casing; a similar spacer sleeve'28 encircling the rod above the spool limiting its rise.

Fixed in the casing 17 is any one of the well known standard makes of snap switches 29 operated by a lever 30 disposed between the spool flanges, this type of switch snapping from one position to the other when the lever is moved past the center of its oscillation, having no dead center or neutral position, being positive at all times. i

Attached to theouter side of the casing 17 containing the switch, is a junction box 31 having a cover 32 through which extend alead-in wire 33 and outletwires respectively 34 and 35 encased in insulation colored so as to be readily distinguished.

In operation let it be assumed that the liquid in the tank has reached a sta e requiring replenishing, as indicated-by t e views, the weighted float restin on the collar 22, drawingthe 'rod to its owermost position and, by reason of the spool26 engaging the switch lever 30, throwing the switch so that current may" be conducted to a motor driven supplypum not shown, a signal, or both as may be pre erred.

The pump upon by an electric current ing a the tank, causing the float 24 to rise and upon or a watchman receivbeing started, either direct I lower water signal, will begin to refill a contact of the float with the upper collar 21, indicating the high water level, will raise the rod 20 and sleeve, carrying the switch lever past its center whereupon it will justed cannot be tampered with injudicially or maliciously, rendering the device essentially fool proof. I

As the operative parts are extremely simple, if a proper switch be used and adjustments be correctly made the device may be depended upon to operate indefinitelyand without lubrication, care or supervision.

Although the foregoing is descriptive of the preferred embodiment of theinvention, it will be apparent that minor changes may be made in its construction, without the exercise of invention or conflicting with the scope of the claims hereto appended.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is I 1. A liquid level control device comprising a casing, a height adjustable tube supporting the casing, a rod passing through said casing and tube packings in said casing for the tube, a snap switch in said casing, said switch having an oscillatable control lever, a flanged spool on said rod engaging said lever, adjustable stops on the lower exposed portion of said rod, a sleeve slidable on said rod to engage said stops and a float fixed intermediate the length of said sleeve.

2. A float controlled electric switch comprising a sectional casing com osed of two equal portions united at their flanged edges and having a gasket interposed therebetween, a junction box on the exterior of one section, a snap switch fixed in said section, said switch having an operatin lever extending into, the other section, a tu ular guard tube fixed in said casing, an adjustable support collar for said tube whereby said casing may be raised and lowered, a rod slidable through the last named casing section, said rod being partially enclosed in said tube packings in said casing for said rod a double flanged spool fixed on said rod within the last named section to engage the switch lever, means in said casing to limit the movement of said spool in either direction, a weighted float movable on the extending portionoi said rod and stops adjustable on said rod to control the movement of said float relative thereto.

Signed at New York, in the county of New York and State of New York, this 16th day of September, A. D. 1926. I

LEONARD H. HARDING.

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