US1339935A - Electric radiator - Google Patents

Description

C. V. STEVE NSON AND H. BURGESS.

ELECTI-HC RADMTOR. APPLICATION mu) JUNE 12. I918.

Patented May 11, 1920.

C" V. STEVENSON AND H. BURGESS. ELECTRIC RADIAIOR, ICATION FILED sum:

cncn. vmcmrr srsvnnsom or STATES PATENToFFIoE' SYDNEY, AND HENRY BURGESS, F PADDINGTON,

NEW SOUTH WALES, AU$TRALIA; SAID BURGESS ASSIGNOR T0 SAID STEVENSON.

1 ELECTRIC mnmron.

To all whom it may concern Be it known that we, Cnon; VINCENT STEvENsoiw'and HENRY the King of Great Britain and Ireland, rc-

siding at 605 Geor e strccLSydney, in the State of New Sout WValcs, Commonwealth of Australia, and 182 Windsor street, Paddington, in the State aforesaid, respectively,

have invented certain new and useful I mprovements in Electric Radiators, of which the following is a specification.-

' This invention relates to electric radiators employing heating elements of a type comprising a cone of refractory material about 15 which is a'helical groove in which is wound a coil of high electrical resistance which becoming heated by the passage of the current; imparts its heat to the cone, causing the lat ter to glow.

0 Andthe object of the invention is to effect certain improvements in or relating to the;cone, its construction and attachment n 9 ns, and to the electrical contacts, whereby tire intimate association of the heating coil with the cone is maintained despite the expansion ofthe former by heat, whereby. the fittin of the cone in a radiator is so sim Iified as torequireno expert knowledge so t at'new cones complete may-be supplied separately and fitted by any person 0 ordinary skil and intelligence, and whereby in con unctionwith a three way switch three variations of heating efl'ect may be obtained with corresponding yariation of current consumption. r

With theseobjects, in view the invention consists: firstly in the form' ment'of the. groove or grooves about the cone and in the attachments relating to the fitting of the cone in the in the arrangement of electrical contacts: and thirdly, 'in the provision where required or desired of two separate grooves 'on the cone and a resistance coil in each groove, the arrangement of the required connections, and the association therewith of a three way switch whereby said coils may be coninected in series or in parallel or one coil i-only-may be in use, to give minimum maximum or medium heating cflect respectively as may be, uired or desire( all substanially as hereinafter described with refernce to the acconmanying drawings, and ore particularly specified in the appended laims.

Specification of Letters Patent. Application Medium 12, 1916. Serial No. 239,564.

Bnnonss, subjects of turned over the end and arrangcturned segment 25 radiator; secondly,

Patented May 11, 1920.

In the drawings:-

F igure 1 is a perspective View of a radiator with heating elements according to this Invention, having two resistance coils, and a three-way switch for regulating the heatin r effect.

ig. 2 is a part sectionalclevation of the radiator taken through the cone and its attachment, and also showing the three-way switch in diagrammatic form; and

Fig. 3 is a sectional elevation on line 8, 3, of Fig. 2. Fig. 4 being a similar View on line 4, 4, of Fig. 2 looking in the reverse dircctiou.

Fig. 5 is a diagrammatic view of the wirmg arrangement and of the three-way switch, one coil being shown heavier than the other, merely for the sake of distinction.

he cone is provided with a plug ll. attached thereto by metal ,bolts 12 and 13' the nuts of which constitute terminals 14 and 15 heat insulating washers 16, 16, being interposed between said cone and plug so that the latter is'kcpt comparatively cool. The plug 10 is provided peripherally with a screw-thread of coarse pitch formed on a metal cylinder 17 afiixcd to said plug in known manner and having a segment 18 inof the plug to underlie and make electrical contact with the diskhead 19.01 bolt 12. The said cylinder 17 engages and makes electrical contact with a female threaded cylinder 20 secured within a cylimlrical socket 21. attached to the framing 22 of the radiator by bolts 23, 23, which also hold the concave reflector 24. The threaded cylinder 20 has also an inwhich engages and makes with a stud 26 passina end of socket 21 and to electrical contact through the closed which is attached a terminal 27.

The cone 10 is fitted at its larger and outer end with a grille 28 to which is attached an axial rod 29, and on the exterior peri herv of said cone is .ahelical 'zrroove single or double according to whether the radiator is of single or variable beat type), and of which the sides are parallel.

his construction 'of groove afi'ords greater depth comparatively to width than with an ordinary V groove, the resistance coil or coils are more snugly housed therein and when expanded by heat still remain in close contact with the sides of the groove, and there is less liability of short circuit not ing by a convolution mounting its groove and-contacting with an adjoining convolution.-

One of said resistance coils'31 is O0nl160t-' ed to terminal 14 on bolt 12 and to the axialrod 29, while the other coil 32 is connected 37 carrying on its rearward face an insulat ing r 38 of mica or other appropriate materia whereby it is insulated from stud 26. The said ring 37 is attached to and supported by a metal stud 39 enga ing a bored and threaded boss integral witl said ring projectingthrough the socket 21 and fitted externally thereof with a nut constituting a terminal 4.0. 1

The switch 41 has terminals A and B to which are respectively connected the main conductors C and D, and also has poles L, M and N. On said terminals A, and Bare ivoted a pair of associated arms E and F, ihe'r' free ends being arranged to make contact with the 'said poles as hereinafter explained. The wirin arrangement from the switch 41 to the radiator (see Figs. 2 and 5) consists of a conductor P from terminal B to terminal 49 a conductorjS from pole N to terminal 27 and a conductor T from poles L and M to terminal 35.

This wiring arrangement is suitable for alternating or direct current. i

In Fig. 1 the switch 41 is set with terminals A and B respectivel connected to poles L and N, the current ow for that setting being by conductor T to terminal 35 sec et 34, re 29, resistance coil 31, bolt 12, threaded cylinders 17 and 20 and stud 26 to terminal 27 switch pole l4 arm F and terminal B and (or) vice versa; also the current flows from terminal 35 throu h rod 29, resistance coil 32, bolt 13, plate a, stud 39 to terminal 40, thence by conductor P to switch terminal B and (or)vice versa. In this setting the coils 31 and 32 are operated in parallel to produce maximum heating effect.

In Fig. 2 switch 41 is set with terminal A connected to pole, M, the current flow being by conductor T to terminal 35, rod 29, coil 32, bolt 13, ring 37, stud 39 and terminal 40, thence by conductor P to switch terminal B and (or) vice versa. In this setting one coil only is operated, thus providing medium heating efi'ei-t.

In Fig. 5 switch 41 is set with terminal A connected to pole N the current flow beonly to thence by conductor S toing b conductor 'S to terminal 27 thence as be ore through coil 31 to rod 29 (which however is out out), and from rod 29 through coil 82 as before to terminal 40 thence b conductor P to switch terminal 13, and gr)vice versa. In this setting the coils 31, 'nd 32 are operated in series to produce minimum heatln efl'ect.

It will be obvious that y eliminating terminal 40, stud 39 and ring contact 37, and by employingone resistance coil only a d an appropriate simple switch that the same general construction provides a single heat radiator.

It will also beobvious that the heating element comprising cone with coil or coils, and plugewlth threaded cylinder, requires screwed home in the socket, the necessary electrical contacts being automatically made.

What we claim and desire to secure by Letters Patent is: v

1. A heating element for an electric radiator, comprising a cone of refractory material having about its periphery a resistance coil laid in a helical groove, a plu of refractory material on the smaller en of said cone, an externally threaded cylinder constituting a contact making element about said plug and having a segment inturned over the end of said plug, through bolts connecting said plu and cone, one of said bolts engaging sai inturned segment and electrically connected to one end of said coil, and in said plug a central rod constituting a contact making element electrirllally connected to the other end of said 001 2. A heating element for an electric radiator, comprising a cone of refractory material havingS about its periphery two 'rethe smaller en [of said cone, an externally threadedmetalcylinder constituting a contact making'elementabout said plug and having a segment inturned over the end of said plug, a pair of through bolts connecting said plug and cone, one of said bolts engaging said inturned segment and electrically connected to one end of one at said coils while one end of the other coil is connected to the other bolt, and a central rod constituting a contact making element to which the other endsof said coils are con nected.

3. A support having a socket, a sheet metal lining in the socket and formed with a screw thread, and a binding post on. said socket and securing said lin ng in place, in combination with a plug having a sheet metal cylinder therearound provided with a threa to engage in that of the lining and with a bolt extending through the plug and heating element comprising a cone of refractory material and a resistance'coil on saidpone, the smaller end of the cone and in post to the said central rod. jone end of the'coil being connected to the Signed at Sydney, N. S. Wales, this tenth 6 post, a central rod extending through the day of May, 1918.

cone. and through the core and connected to CECIL VINCENT STEVENSON.

HENRY BURGESS.

post on the socket, and means to detachabl? and electrically connect said second bin the other end of the coil, a. second binding

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