US 1005754 A
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Description (OCR text may contain errors)
M. H. SHOENBERG.
ELECTRICAL WATER HEATER.
APPLICATION FILED APR. 29, 1911.
. Patented 001.1(),19111 ff-@293 er? 6 1 v l, ff. f. f//f//ff/ Gurneg UniTED- STATES vPAlTEN'-I?. 1OFFICE.
` HILTON H. SH'OENBEBG, or sanrmncisco, oamromimg- -ELEcrnIcaL WATER-HEATER -To all wwm. it .may
Be it known that I, MILTON H; SEQEN- BERG, a citizen of the United States, residing yat San Francisco, in the county'of- San Franci co and=State'-of California, have invented] new and-useful Improvements in Electrical Water-Heaters, of which the following is a specilication.; l
jMy invention'relates to certain neyv andl museful improvements in fluid-heaters, and
moreparticula'rly'to that class of apparatus wherein Wateris heated through the medium1 of an electric current, and-may 'be rapidly' heated, almost.'ins tantaneou's ly. iiifact, to any desired degree as it flows throughga delivery-pipe tothe pointof discharge.. p In* apparatus 'of this character," there is danger' of overheating .or 'burning out the heater 4ele'-A ments-in. case the electric current. should. be switched' onto the 'apparatusfivhen the.
water is not; owin'g.
' Itis the purpose'of my invention to vpro-p. videmea'ns for' insuring va 'How of Water.-
-through the heater Whenever the' electric circuit is completed, 'and toy prevent cutting' o# thewa'tensupply,Whilethe electric cur,- rent ison,A a Another object" is to prevent any electrolysis between theparts 'ofthe apparatus w or a difference ofl 'electrical potential be-i tween the 4exposed parts.
A further object is 'to construct lan ap paratus in which the fluid channels and the heater element-s shall be readily -for inspect-'ion and repair.'
I Other objects .Will be apparent from the 'Following description 'in connection with the a'tcompanying drawings, in Which- Figure .1 is a-.verticalsection of 'an ap.'- 40 paratus embodying my invention; 2 is a front elevation ofthe s'ame'showingthe switch turned otfand the water 'valve closed, the electrical connections being indicated in of the heating chamber,.showi a plurality of heater'elemen'ts; and Fig. 5 1s a rear elevation of a modified'form of'a'pparatus with the cover plate removed. l U
'Thev heater casing l, illustrated 1n F1gs. 1, 2,' and 3, may 'be constructed of porcelain, metal, or other suitable material, Iand 1s pro-v vided With a heating chamber 3 and 'a fd1s nected to the top `of the heating chamber l specificati@ oftewel-snuit.'
and conductedthrouvh the bodyor'wall accessiblev dotted linesgFig. 3' is a rear elevation With-` the cover plate removed and 'partly in 4sec.-v -tion; Fig. Ltis a fragmentary sectional view 'Patented oet. 10,1911.-
of the casing ,to'a disc arge opening .'near the bottom torwhich.y a vfaucetforrspoutl 6 is fastened..` By. carrying the discharge chan- .nel through the ',Wallf ofthe i casing, vI" am enabled .tdeectively prevent any electr'olysis bet-Weenthe. inlet' and outlet. of the heater. .To avoid the-possibility of any. difjoint. When the Waterchamber is 'exposed as shown in Fig. 3, t'hej' heatmgpcoil's .14'
'are entirely exposed and mavabe thoroughly inspected Without removin'g'them fromtheir supportsin the chamber.` I 'have found' that these heating elementsor coils are'much vmore efficient when disposed longitudinallyl of th'elow ofuivatertandare so placed j'fthat the .Water currents pass 'directlyy through 'the coi'ls. 'I accomplish these purposes by bending the coil aboutan 4insulatingknob. o r,bi1t
pass easily through the int'erior'o't-he coils.
more screivs 10, a gasket l2 4insuring; a'.tight ton 16, which y opens or spreads 'the' 'spirals' 'jatl the bend or bight,l permitting the water to- The-end loops'of thefcoil's are placediover contact bars 18, 19,V secured tobinding posts 20, to which 4the' switch contacts are. connect-- ed. The length-of 'the'heating coilsis` such thatfwh'en they.are. m'ounted 'in position, -they' will -be held under a cert-ain amount of tension and-.Will thu's maintain godelec@ trical contact `with the bars 184 and v19;l Byv threading a v plurality of' coils', in parallel upon the contact-bars, in' the-manner illus-A trated in Figjt, I can vincrease the heating capacity'of theapparatu's, and 'byc'ha'n ing the number of the coils Irca'n .vary orfa 'just the capacityto suit different 'conditions and regulate the degree" of heat.' The several ad.
vantages 'derived" from this 'manner of mounting'fthe''.lieater-elements into' U-shaped 'coils will no'w. be ppfztlent. In addition to charge channel 5,v which' is preferably. cong' the 'special vadvantages above mentioned, 4I
charge channel l am enabled to secure a very compact. de
vice, the two ends or .arms of the coil being closely associated in the same chamber, reducing the exterior surface of the casing to a minimum and concentrating thev waterheating surfaces.
the heating chamber, thus-reducing the radiation losses botlrfrom the chamber and in common use may be' attached to4 my y with' recesses .from the channel. The .arrangement is so simple that anyone can'introduce or replace the coils, the act of bending the loop around the button' 16 serving to automatically lspread .the convolutions of spirals 4at the bight adjacent to the water. inlet, so that the services of a skilled mechanic are unneces# sary.
Upon the front of the casing is mounted a snap-'switch having a base 25, provided to receive the binding posts 2() or connecting devices attached. to the contact bars 18 and 19. n outer removable shell 27 protects the setsof contacts 28, connected with the heater coils, the leads 30 4fioiii'the supply wires. The
rotary stem 82 carries-pairs o-f switch blades,
'which are brought into engagement withV said sets of contacts'in one position and are disengaged therefrom in another position.
An ordinary snap-switch such as is now heater, the-proper electrical connections being made with the contact bars which sup- For the purpose of guarding against the possibility of burning out the heater-coils by turning on the current when the water is shut voff from the water-chamber, I provide an auxiliary guard or safety lock-plate 35, having a central port the heater-coils.
opening which may be placed over the stem ofany ordinary snap-switch and secured in position by means of a clamping bar 37 screwed or otherwise fastened to the stem.
The .periphery ofthe guardI or lock-plate,l
projects into the path of the water-valve 1 handle', so that it will normallybe prefventedfrom moving .to the closed position by striking the edge of the plate as indicated in dotted lines in Fig.
the switch is in the off position withtlie 'electric current .cut off,vin which position which shall flow through th y ber when the electric. current'ig-0h.
erifchamand also and 29, connected with .and cooperating contact members carried by 1, and can only be. turnedto fully shut off the water valve when riphery7 a handle adapted to enter one ing device upon said handle adapted to to adjust the, exact position ofthe handle when it is forced back within the recess, I. attach a regulating screw or other adjustable' device L10, to the handle.- Afterl the proper -adjustment has been made,the lparts maybe locked in position by means of a lock-niitfll.4
Before the switch can'be turned to'close the electric circuit, it is first necessary to pull the lever handle 38 until vit is disengaged from the notch 39 in which it lies when the cock is. closed, and assoon as it is pulled down far enough to allow the dis'lr on the switch stem to be turned, the cock will; open sufficiently to permit a flow of water through the heating chamber and the heating element orcoil will .be submerged and protected from injury. The heating coil may be made. of bare wire, or it may be a wire thinly coated. with a substance which willv not be suiicient to interfere with itsheat conductivity. Ifit is desired to draw cold water only, the lever may bepulled down to open the cock without closing the switch, and when it is desired to draw hot water, the switch is. turned to the closed or on position as previously described. I am aware that changes may be made in the structure of the apparatus which has been shown herein' for the purpose of illustrating an embodiment of my invention, such as .will occur to those skilled in' this art, and I-desire to cover the same in the appended.
I therefore claim as my invention;- p
l. An electric fluid heater comprising a casing having a heating chamber 'provided with inlet and *outlet passages, supporting bars in 'one end of said chamber and an insulating studatthe otlierend, a heater elenient having its ends secured respectively to said bars and its 'intermediate portion bent around saidstud, an electric switch having contacts connected with said bars a rotary stem, a 'guard or locking-plate carried by said stem having notches in its periphery, and a valve in said inlet passage having a handle ladapted. to enter one of said notches when in the closed position. v
2. An electricfluid heater comprising casing having-a heating chamber provided.
v with inlet and outlet passages, supporting bars in one end of said chamber and an insulating stud at the other end, a heater elea... in
ment having its ends secured respectively to.' said bars and its intermediate portion bent around. said stud, an electric. switch having' contacts connected with `said bars and coperating contact members carried by a guard or locking plate carried by said stem having notches in its pea valve in said inlet passage having of said notches Sii regulate. the approach' thereof with respect to the periphery of said plate. i
3. An electric heater comprising a casing having a heating chamber provided with inlet and outlet openings, electric heating coils in said chamber, a metal supply cock connected with said inlet, a metal discharge pipe with said outlet, and a short-c'ircuiting plate fixed to the casing and connecting said metal parts. y
4. An electric water heater comprising a casing having a heating chamber providedy casing provided with a'recess forming av heating chamber having a side cover plate which may be removed to give ready access to'. the entire chamber, contact bars located near one end of said chamber and an 1n- 'sulating support near theopposite end thereof, and U-sha-ped spiral heating coils Withinsaid chamber and having their ends detachably connected to said Contact bars and their intermediate portions supported upon said insulating support. 6. An electric Water heater comprismg a casing provided With a recess forming a.
heating chamber having a side cover plate which may be removed to give ready access to the entire chamber, conducting contact hars projecting Within one. end of said chamber and an insulatingsupport projecting within the opposite end thereof, and U-shaped spiral heating coils Withm said. chamber and having their ends detachably connected vto said contact bars andtheir intermediate portions supported upon said insulating support.
7. An electric water heater comprisinof a casing having a heating chamber provided wit'lrnlet and discharge passages, said discharge 'passage being connected with one end of said chamber and passing through the bodyof the casing parallel With'and adjacent to the chamber throughout its length,
and havingan loutlet opposite theinlet end thereof, electric heating coils supported within. said chamber, and switch contacts connected with the terminals of said'coils.
8. n elect-ric water heater comprising a casing having a heating chamber provided with inlet and dlscharge openings, heatmg coils supported Within said chamber, av
rotary switch having contacts connected with the termina-ls of said coils, a disk detachably connected to said switchandrot-atable therewith andhaving recesses upon its periphery, a water valve connected with said inlet, and a. controlling lever for said valve adapted to swing intoone of said notches to lock the switch when the Water supply is" cut off; l
9. An electric Water heater comprising a casing having a -heatingchamber provided with inlet andv discharge openings, .heating coils supported wit-hin said chamber, a rotary switch having contacts connected with the terminals 'of said coils, a disk detachably 'connected to said switch and rotatable therewith vand having recesses upon its periphery, a Water valve connected With said inlet a controlling lever for said "valve adapted to swing into one of said -notches to Alock the-switch when the -Water supply is cutoff, and Van adjust-able gage on said lever to engagev said disk and regulate the minimum flow of Waterv WhenI thel electricr vswitch is inthe closedor on posit-ion.
' In testimony whereof I havel hereunto set my hand in presence oftWo subscribing Witnesses.
MILToN H. sHoENBERG'. Witnesses-,z
CHAS. F. DUISENBERG, FEN'roN P'. FOSTER.