US1889833A - Adjustable thermostat for radiators - Google Patents

Description

Dec- 6, 1932- A.` JLHARTFIELD ADJUSTABLE THERMOSTAT; FOR RADIAToRs Fi'ied May 26,

1931 `I2 SheetsSheet l ATTORNEYS.

A. HARTFIELD ADJUSTABLE THERMOSTAT FOR RADIAToRs Filed Mayzs, 1951 .2 sheets-sheet 2 Patented Dec. 6, 1932 UNrr s AUJGUST Tf HARTIEIELD, OF HUNTINGTON PARK, CALFORNA, ASSIGNOR TO :PACIFIC- trier. f

GAS RADIATOR COMPANY, 'OF HNTNGTON P f, CA'L'FORNIA ADJUSTABLE '.rnnntiesrnr ron assurons. i

Application filed May 2.6,

rlhis invention relates to a heat-regulating device applicable to various types of heaters. An object of the invention is to provide a devicev of this kind which can be more cheaply and conveniently `attached to heaters now on thev market, and one which will not disfigure or encumber the heater to which it is attached. l

Another object of the `invention is to simplify the thermostatically operated and pressure controlled elements of the ldevice and to render them more positive and dependable in y their operation. f

Still another object of the invention is to provide an improved arrangement'of cooperating thermostats whichwill under all `cohditions insure `a safe/operation of the heater. Yet another object of the invention is to provide animproved connection between a fuel valve and the means for thermostatically actuating such valve.

.Other objects, advantages and features of the invention may hereinafter appear.

Referring to the accompanying drawings 35 which illustrate what is at present deemed to be a preferred embodiment of the invention, Fig. 1 is an end elevation of the lower portion of a radiator showing the device applied thereto. i

Fig. 3- is fa section on line 8-3 of Fig. 2. Fig. 4 is a side elevation of a radiator showing the device connected therewith. Referring in detail to the drawings, and describing first the thermostatic device which is attached to the casing 10 of the radiator, said device comprises a bi-metallic thermostatic arm 11 which is laterally deflectable y Vunder the influence of heat The upper end of said arm is secured to the wall of the casing 10 by any suitable means as by the screw 12. Above said arm 11 a bracket 14 projects` from the casing and is used to pivotally support a bell crank lever having a horizontally extending arm 15 and a downwardly extending arm 16, the latter arm having tapped therethrough an adj usting screw 17, the inner end of which is operatively related to the free end portion of the thermostatic arm 11. The bracket 14 whereon the bell crank lever Fig. 2 is a section on line 2-2 of Fig. 1. i

1931. Serial No. 540,961.

just described is mounted, consists of a screw threaded stem 14a., a bifurcated head 14?) and a lock nut 14o screwing on to said stem. The bell crank lever. is pivotally secured to the bifurcated head 14o after'the bracket 1'4 hasy beenV screwed into a screw hole v'provided therefor in the wall'ofithe casing ,10.- The lock nut 140 serves tosecurely maintain thel bracket 14 in the adjusted position. By this arrangement the operative connection between the thermostatic arm lland the valve 25 may be accurately regulated.

To the lower portionof the casing 10 is secured externally thereof the mixing chamber fixture 20, the otherwise open end of which is more or less obstructed by an vadjustable cover 21 through which is fed the fuel pipe 22, these parts, separately considered form-v ing no part of the present invention.

' Fuel is fed to the pipe 22 past the fuel valve 25, said valve being provided with a stem 26 which is slidably contained within the fitting 27,- said fitting being screwed into place as shown. Said valve stem 26 operates through a stufling box 30, a wire stern 31 being tapped into the end of said valve stem. The stem 26 of the valve is provided 'at its outer end with a head 26a and armfv15 of the aforementioned bell crank lever, said arm 15 having a bifurcated end portion which passes alstride the stem 31. lhe'n' the temperature ofthe radiator 'rises Vabove a predetermined amount the thermostat 4voperates the bell crank lever and` causes itsyarni 15 to press against the head v26a of the valve stem 26 thereby shutting off further supply `of fuel to the burnerB. `When the temperature decreases the hifurcated this head is in an koperative relation to the arm 15 recedes from the head 26a of the valve y stem .and allows the valve 25 to reopen.

Owing tothe fact that the end portion of the wire'stem 31 is at all Jcimes loosely contained within the socket which is provided in the -end portion of the valve stem 26, said valve stem aids in safely maintaining said wire vin itsslidable operative vposition inl alinement with said stem. Hence avery simple Vand dependable construction, which is also easy to assemble, is provided for the purpose set forth.

Before the fuel reaches the valve it is fed through an opening or passage 42 which is controlled by the double diaphragm 36 within the diaphragm casing 37, said casing 37 preferably being provided with a peripheral flange 88 whereby it is secured to the main casing of the radiator. After passing through the opening 42 the fuelis delivered by a channel 39 to the intake side of the valve 25 already mentioned.y The passage 42 is controlled by the steam pressure, while the valve 25, as already explained, is controlled by the external dry heat produced by radiation. e l ANormally when the heater is' in regular operation the steamoperated double diaphragm 36 is spaced away from the main central supplyV opening 42, thus permitting the gas to freely enter the intermediate chamber from the supply chamber 41 through the port 42..l` From the intermediate chamber 40the fuel flows through the peripheral outlet 39 past the valve 25 to the burner B. lVhen, however, the steampressure rises suiiiciently to close vsaid central inlet o eninO- the onl @as admitted enters through the small by-p-ass opening 45 into the intermediate chamber and thence out said peripheral opening to maintain the operation of the burner B, which would other wise be completely extinguished. The double diaphragm 86 and parts immediatelyV associated therewith are not, separately considered, a part of the present invention and are therefore notl described in full detail.

In addition to the thermostatic control which includes the bi-metallic arm 11, another thermostatic control is provided, the latter control being associated with the pilot burner 46 and being arranged to operate the wire 31, the greater part of which is contained within a tube 465. Said pilot burner is supplied with fuel by tube 46m. This thermostatic control is provided with a bimetallicl arm 50 constructed for lateral de-V flection like the arm 11 already described.

Said arm 50 is, however, preferably placed within the radiator and atv one end secured to the inner wall of the radiator by means of a screw 51, the free end of said arm 50 being in an operative relation to the end of the-wire 31 which is tapped through the wall of the radiator as indicated in Fig. 4. The thermostatic arm 50 is placed so close to the pilot burner 46 that if the burner accidentally becomes extinguished the arm 50 will operate kthe wire 31 and thereby close the valve 25.

The operative connection between the wire 31 and valve-25 is best'shown in Fig. 2 where it will be seen that said wire is led through a bushing which has externally threaded end portions, a cap 56 being screwed upon the outer end portion of said bushing. Said cap 56 has an aperture therethrough into which the adjacent end of the tube 46 is tightly tted, means thus being providedto form a clamp tight fit. The wire 31 has a sliding it within a socket provided therefor in the head 26a and outer end of the stem 26. This arrangement permits the bell crank arm 15 of the other thermostatic device to close the valve 25 without affecting the position of the wire 31 or the operation of the thermostatic arm 50.

I claim:

1. In a device of the kind described, the combination, with a valve to admit fuel, said valve having anoperating stem with a relatively deep socket or bore in the end thereof, of two thermostatic devices each adapted to close said valve independently of the other and without interference with the other thermostat, one of said devices comprisinga wire or stem having its end port-ion slidably and loosely fitted within said socket and duringall operative positions retained therein and adapted to abut endwise against the bottom thereof, and the other thermostatic device comprising an arm with a bifurcated vend portion. whichv straddles said wire and which is adapted to impinge upon the end of said valve stem to close the valve.

2. In a device of the kind described, the combination with a fuel valve and dual thermostatic means for actuating said valve; of a stem forming a part of said valve and projecting outwardly therefrom, said stem havlng a relatively deep longitudinally extend-y ing socket in its outer end, and an operating rod projecting loosely into the socket of said stem, said operating rod being connected with one of the themostatic controls .and the other thermostatic control having an operating relation to said valve stem independently of said rod,

In testimony whereof I hereunto affix my signature. v

AUGUST J. HARTFIELD.

Images