US1984076A

US1984076A - Electric water heater

Info

Publication number: US1984076A
Application number: US650405A
Authority: US
Inventors: Edward L Monnot
Original assignee: Weber Dental Manufacturing Co
Current assignee: Weber Dental Manufacturing Co
Priority date: 1933-01-06
Filing date: 1933-01-06
Publication date: 1934-12-11
Anticipated expiration: 1951-12-11

Description

Dec, 1l, 1934. E. L, MoNNoT ELECTRIC WATER HEATER 2 Sheets-Sheet l Filled Jan. 6, 1933 flllllllllllllf E Jl/011110! N R m MA YV B .w m A 941.2d 6 M8 q 4 7 5 1 Q4 Dec. 1l, 1934. E. l.. MoNNoT ELECTRIC WATER HEATER Filed Jan. 6, 1953 2 Sheets-Sheet 2 INVENTOR R BY ./l/a/mo 9; ATTORNEYS Patented Dec. 11, 1934 UNITED STATES ELECTRIC WATER HEATER Edward L. Monnot, Canton, Ohio, assgnor to The Weber Dental Manufacturing Canton, Ohio, a corporation' of Ohio Application January 6,

2 Claims.

My invention relates in general to electric water heaters which are of the type wherein walls form a storage chamber for warm water, and wherein the water is maintained at a desired tem- `5i perature in the chamber, by means of a thermostatically controlled electric resistance heating element; and in particular my invention relates to electric water heaters which are adapted for use by dentists and the like for selectively supplying either warm or cold water directly to the water syringes used by dentists in connection with dental operations in the oral cavity.

Such a water heater for such dental purposes is usually supported on a dental unit or the like located closely adjacent the dental chair for convenient use by the dentist, and should be leak proof in itself, and any or all valves andfittings associated therewithshould likewise be leak proof so that no water may drip or leak upon the dentists hands during use of the heater or the water syringe with which it may be connected, and also so that there shall be no dripping or leaking of water upon the patient either while in the chair or while approaching or leaving the chair.

From another standpoint, `such a dental water heater should be relatively compact so as to occupy a minimum volume of space, and thus permit free movement of the dentists about and betweenthe chair and the unit.

From still another standpoint, such a dental water heater should be of simplified construction and arrangement permitting easy and economical assembly and disassembly during manufacturing and maintenance operations, and in which each other in such manner as to provide `the desired supply of warm water with a minimum consumption of current by the electric resistance heating element.

No electric water heater has been generally available which has met With complete satisfaction each and all of the above set forth desirable characteristics of electric water heaters for dental purposes.

l at the same time the parts are associated with Accordingly the objects of the present inven-l Company,

1933, Serial No. 650,405

provide a high degree of thermal and electrical efficiency.r

The foregoing and other objects are attained by the improvements, apparatus, parts, combinations, and sub-combinations, which comprise the present invention, and the nature of which is set forth in the followingA general statement, and preferred embodiments of which, together with their mode of use are set'forth in the following description, and which are particularly and distinctly pointed'out and set forth in the appended claims forming part hereof.

'I'he nature of the improved electric water heater of the present invention may be described in general terms as including walls forming preferably an integral and compact housing, some of the housing walls preferably forming a storage chamber for water' and walls forming the storage chamber preferably being provided with a lower opening, an improved closure and heat box forming member for the storage chamber opening, the closure being preferably removably seal mounted in the housing across the storage chamber opening, and the closure preferably including walls forming a downwardly opening heat box, anelectric resistance heating element, preferably removably fitting within the heat box, and preferably coacting means on the heat box and heating element for releasably securingfthe heating element in the heat box.

Other of the housing walls preferably form a heat control chamber below the water storage chamber, and the walls forming the heat control chamber preferably being provided with a lower opening, a closure member preferably fitting and being removably secured to the housing across the heat control chamber opening, a thermostatic electric switch located inthe heat control chamber, conductors operatively connecting the electric heating element and the thermostatic switch and adapted for connection with a source of electric power, whereby the temperature within the heat control chamber serves to operate the thermostatic switch so as to connect and disconnect the electric heating element with the source of electric power when thetemperature within the heat control chamber falls below or arises above predetermined lower and upper temperatures within the heat control chamber, and consequently whereby the temperatureof the water in the storage chamber preferably located as aforesaid above the heat control chamber may be maintained within a predetermined desired temperature range.

Others of the housing walls preferably form inlet and outlet ducts, the outer end of the inlet duct being adapted for communicating connection with a supply of water and the outer end of the outlet duct being adapted for communicating connection preferably by means of a flexible tubing with a water syringe and the like, the housing walls moreover have preferably formed there-- in a by-pass duct communicating directlybetween the inlet duct and preferably the upper end of the water storage chamber.

There is also preferably provided an inlet Water directing tube, the upper end of the water directing tube preferably comrnunicatingly con-I.,

necting with the storage chamberend of the bypass duct, and the lower end of theinletgwater directing tube preferably terminating and opening preferably adjacent the closure and heat box forming member for the storage chamber opening.

The housing walls furthermore have preferably formed therein an intermediate duct having one end 'communicating preferably with the upper for the lower end of the conical valve seat duct.,

A rotary frusta-conical valve stem rotatably fits and is preferably spring pressed in sealing abutment with the frusto-conical valve seat duct, and the valve stem has formed transversely therein a plurality of centrally communicatingly connecting radial ducts, and the outer ends of the.

radialvalve stem ducts are adaptedfor selective connection with the ends of the inlet duct, the

outlet duct, and the intermediate duct terminating in the valve seat duct, whereby, byV rotation of the valve stem, the outlet duct may be entirely shut off from the water supply, or may be communicatingly connected directly either with the inlet duct for a supply of coldv water," or with the intermediate duct for a supply of warm water.

The upperend of the improved rotary valve stem preferably extends above the Vhousing beyond the upper end'of the valve seat duct, and a` laltch kontrolled handle is preferably secured thereon.

Theimproved electric Water heater furthermore includes novel detailk construction andarrangement of the parts thereof as hereinafter set forth. y vPreferred embodiments of the improved electric water heater and of `the parts thereof are.

illustrated in the accompanying drawings forming part hereof, in `which y Figure V1 is a fragmentary verticalv sectional view as on line 1 1, Fig.A 2, and with other por` tions broken away and illustrated in section, of an embodiment of the'improved electric water heating apparatus particularly adapted; -for dental use, in conjunction with a Water 'syringe not shown in Fig. 1 but shown in Fig. 6;

Fig. 2, a fragmentary Vertical sectional View thereof as on line 2 2, Fig. l;

- Fig. 3,v a fragmentary horizontal sectional view thereof as on line 3 3, Fig. 1, the improved valve parts of the apparatus being illustrated inv their relative closed positions, shutting off communication between the interior of the storage chamber and the outlet duct of the apparatus;

Fig. 4, a View similar to Fig. 3, in which the valve parts of the apparatus are illustrated in their relative positions simultaneously permitting the storage chamber to be maintained full of Water and permitting a flow of Warm water from the storage chamber into the outlet duct; n

Fig. 5, a view similar to Figs. 3 and 4, and

. illustrating the valve parts of the apparatus in their relative positions simultaneously permitting the storage chamber to be maintained full of Water and permitting a flow of cold water into the outlet duct of the apparatus;

Fig. 6, disassembled fragmentary and sectional views of certain parts of the apparatus,

and a side elevation View of a form of valve controlled syringe with which the apparatus may be connected, the views of Fig. 6, being reduced in size relative to Figs. 1 to 5 inclusive;

Fig. '7, a top plan view looking in the direction of the arrows 7 7, Fig. 6;

Fig. 8, a horizontal sectional View as on line 8 8, Fig. 6;

Fig. 9, a bottom plan View of the preferred improved closureand heat box forming member, looking in the direction of the arrows 9 9, Fig. 6; and

Fig. 10, a sectional View of the electrical parts of the apparatus as on line 10 10, Fig. 6.

Similar numerals refer to similar parts throughout the drawings.

The improved electric heating apparatus is indicated generally by 10 in an embodiment particularly adapted for dental use and arranged to selectively supply warm or cold water to a dentalsyringe indicated generally by l1, or to entirely shut off the Water supply from the syringe 11. i

While the improved electric heating apparatus 10 is'particularly adapted 'for dentaluse as aforesaid, it may be used when desired for heating other iiuids which may be either liquids or gases.

The apparatus V10includes walls forming preferably an integral and relatively compact housing indicated generallyby 12.

Some ofthe housing walls indicated generally by 13 form a fluid storage chamber 14 which is preferably cylindric as illustrated, and the longitudinal axis ofthe cylindric chamber 14 is normally vertical in use. Y

The storage chamber forming Walls 13 include alongitudinallyy extending tubular wall 13 1, and a Wall 13 2 closes the normally upper end of thewall 13 1.

Intermediate the ends of the wall 13 1, the storage chamberA forming walls 13 include a partition wall 13 3 which is connected at its outer periphery with the tubular Wall 13 1, and which has'formed therein a normally lower'preferably cylindric opening 15. Y

Inother words, as illustrated, the wall 13- is in the form of an annular iiange Wall having its outer periphery connecting with and integral with the tubular Wall 13 1, and having its inner bore forming the normally lower storage chamber opening 15.

An improved combined closure and heat box forming member indicated generally by 16-y is preferably removably seal mounted across the ing member 16, as illustrated, includes alongi-` tudinally extending tubular wall 16-1, Whose diameter is substantially smaller than 'the dipluralityv of apertures 18 each registering with one of the internally threaded bores 17: t

A A sealing gasket 19 is preferably interposed between the normally lower face of the flange wall 13--3 and the normally upper face of theV sealing and mounting flange y16--4, and the clo-` sure and heat box forming member 16 is removably secured and seal mounted across the storage chamber opening 15 by means` of a plurality of screws 20, the Shanks of which extend keach through one set ofthe registered apertures 18 and internally threaded bore 17 and through suitable apertures formed in the gasket 19, and the threaded inner ends of which are screwedV in the bores 17 and the normally rupper faces of the heads of whichgabut and clamp against the flange 16-4.

The tubular wall 16-1 and closure wall 165-;-2`

of the member 16, form a-longitudina-lly extending cylindricY and normally downwardly opening heat box 21 as illustrated, and in use, the tubular wall 16 extends within the heating chamber 14 a substantial distance from the flange wall 13-3 so that the heat box end wall 16-2 is substan tially midway between the storage chamber wall 13,-2 and the lflange wall 13-3.

A preferably cylindrically encased electric resistance heating element 22 preferably removably fits within the downwardly opening heat box 21, and preferably coacting means are associated with the heat box walls and -with the heating element for releasably securing the heating element in the heat box.

As illustrated the releasable coacting means for securing the heating element in the heat box, include a flange ring 23 secured at the normally lower end of the'heating element 22 and extending radially outwardly therefrom and having a notch 24 formed therein.

A tongue 25 extends from the inner surfaces of the frusto-conical wall 16-3 Vand the tongue 25 has such dimensions as to clear the notch 24 when the heating element 22 is longitudinally inserted into the heat box 21 with the notch 24 alined with the tongue 25.

After the element 22 has been inserted completely into the heat box 21, the element 22 is partially rotated so as to locate the notch 24 out of alinement with the tongue 25, whereby the tongue 25 overlaps the flange 23 and releasably secures the heating element 22 within the heat box 21.

The tubular wall 13-1 includes a normally lower end portion 13-1 which extends beyond the normally lower faces of the closure member 16, and forms with the closure member 16 a heat control chamber 26 having a, normally lower opening 27, and a closure member 28 preferably fits across the opening 27 and is secured to the wall portion 13-1, as by means of screws 29 whose shanks pass through suitable apertures in the closure member 28 and which have threaded inner ends screwed into suitable internally threaded bores 30 formed in the wall portions 13-1' and the external heads of the screws 29 clamping the closure member 28 against the wall portions 13-1 in the usual manner.

A thermostatic electric switch indicated generally by 31 is located within the heat control chamber 26 and is preferably removably secured below the normallyv lower faces of the frustoconical mounting wall l6--3, as by means of screws 32 whose threaded shanks are screwed into suitable internally threaded bores 33 formed in the frusto-conical wall 16'-3, and the heads of which screws 32 overlap a mounting plate 34 o`f the thermostatic switch 31,

The electric heating AelementI 22 and the ther- Inostatic switch 3l are of usual construction, and conductorsindicated generally by 35 operatively connect the electric heating element and the thermostatic switch in a usual manner and are adapted for connection with a source of electric power, not shown, lwhereby the temperature within the heat control'chamber 26 serves to operate 'the thermostatic switch 3`l so as to connect and disconnect the electric heating element with the source of`electric power when the temperature within the heat control chamber 26 falls below or arises above predetermined lower and upper temperatures, and consequently whereby the temperature of any liquid such as the usual water in the storage chamber 14, which is preferably located as aforesaid above the heat control chamber 26, may be maintained within a predetermined desired temperature range.

The foregoing construction and arrangement of the closure and heat box forming member 16 with respect to the storage chamber 14, with respect to the electric `resistance heating element 22 and the thermostatic switch 31, and with respect to the heat control chamber 26, serves to attain a high degree` of electrical and thermal efliciency for the improved heating apparatus 10.

i The housing 12 also includes other walls indicated generally by 36 which have formed therein a novel arrangement of inlet, outlet, and by-pass ducts or openings for the storage chamber, as hereinafter set forth in detail, and the walls 36 also form part of and operatively mount a rotary selector valve indicated generally by 37 which vis associated with the several ducts formed in the walls 36.

As aforesaid, the walls 36 are preferably integral with the other walls of the housing 12, and are preferably located at the normally upper end and at one' side of the tubular wall 131` The several ducts formed in the walls 36 include an inlet duct 38, the outer end of which is adapted for communicating connection as by means of a coupling 39 with a supply of water or other fluid, not shown, and the water or fluid having a gravity, and/or pressure, and/or velocity head, whereby the storage chamber 14 is maintained full of water or other fluid at all times.

The ducts formed in the walls 36 also include an outlet duct 40, the outer end of which is adapted for communicating connection as by means of a coupling 41 with one end of a flexible tubing 42, and the other end of the tubing 42 communicatingly connects with the Valve controled syringe 11.

The ducts formed in the walls 36 also include a by-pass duct 43 communicating directly between the inlet duct 38 and the upper end of the water storage chamber 14.

p-rovided and the upper end of the tube 44 connects with the end of the by-pass duct 43 in the storage chamber 14, and the lower end of the tube 44 preferably terminates and opens adjacent the closure and heat box forming member 16, whereby the cold inlet water `is directed to the warmest part of the storage chamber 14 adjacent` The housing walls 36 also have preferably,v

formed therein a preferably frusto-conical rotary valve seat duct 46 extending angularlywith respect to all of the other ducts formed in the` walls 36, and the other end of the intermediate duct 45 and the inner ends of the inlet duct 38 and the outlet duct 40 communicatingly terminate adjacent each other in the valveseat duct 46.

The longitudinal axis of the conical valve seat duct is preferably normally vertical, and the larger end 4 7 of the frusto-conical valve seat duct ispreferably the lower-end thereof, anda preferably removable water sealing externally threaded closure 48 is provided for the internally threaded lower end of the duct 46.

A rotary frusto-conical valve stem 49 rotatably fits and is preferably spring pressed in sealing abutment with the frusto-conical vvalve seat duct K 46, as by means of a compression spring 50 interposed between the normally lower larger end of the Valve stem 49 and the normally upper and inner face of the closure 48.

The valve stem 49 has formed transversely therein, a plurality of centrally communicating radial duct s51, 52 and 53, and the other ends ofthe ducts51, 52, and 53' are adapted for selective connection with the ends of the inlet duct 38, the outlet duct 40, and the intermediate duct 45 terminating in the valve seat duct 46, whereby, by rotation of the valve stem 49, the outlet duct maybe entirely shut off from the water supply and from the storage chamber as illustrated in Fig. 3, or may be communicatingly connected directly with the intermediate duct for a supply of warm water as indicated in Fig. 4,

or may be communicatingly connected directly with the inlet duct for a supply of cold water, as illustrated in Fig. 5. Y

The upper end of the valvestem 49 extends above the housing 12, and beyond thenormally upper end of the valve seat duct 46, and an op- An inlet water'directin'g tube 44 is preferably eratinghandle 54 is securedupon the upper endv of the stem 49, and latch means. indicated gen.

erally by 55 are interposed between the handle 54 and the upper end of the walls 36, whereby. the valve stem 49 is releasably maintainedin either one of its three selective, positions, after manual rotationlto any of said positions.

I claim:

1. ValveA apparatus including walls having formed therein a plurality of ducts, the ducts including an inlet duct having one end adapted for communicating connection with a source offluid and the like, an outlet duct having one end adapted for communicating connection witha'A valve controlled syringe and the like, an intermediate duct having one end adapted for communication with the interior of a storage chamber and the like, a valve seat duct, and the other ends ofy the inlet, outlet,` and intermediate ducts communicatingly terminating in the valve seat duct, a valve stem rotatablyi'ltting in the valve seat duct and the valve stem having formed transversely therein a plurality of centrally communicatingly connecting radial ducts, and the vouter ends of the radial Valve stem ducts being spaced for selective connection some with the valve duct ends ofthe inletduct andthe outlet duct and some with' the valve ductends of the intermediate duct and the outlet duct.

2. Apparatus for heating uid and the like, including walls forming a storage chamber for the fluid, some of the walls having formed therein a plurality of ducts, the ducts including an inlet duct having one end adapted for communicating connection witha source of the fluid, an outlet duct having one end adapted for communicating connection with a Valvecontrolled syringe and the like, a'by-pa'ss duct communicatingly connecting the inletduct with the interior of thel for selective connection some with the valve ductv ends of the inlet duct and the `outletduct and some with the valve duct ends of the intermediate duct and the outlet duct, and means for heating Some of the walls of the storage chamber.

EDWARD L. MONNOT.